Patent Application
20250202749
The following relates to wireless communications, including frequency domain multiplexing of demodulation reference signal.
Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE).
Some wireless communications systems may support multiple formats for physical uplink control channel (PUCCH) messages from a user equipment (UE). The formats may be classified based on physical resource allocation including the length of orthogonal frequency division multiplex (OFDM) symbols or the quantity of bits that the PUCCH message carries. Formats that are associated with a quantity of less than 4 OFDM symbols such as 1 to 2 OFDM symbols, may be referred to as “short” format PUCCH messages and formats that are associated with a quantity of at least 4 OFDM symbols, such as 4 to 14 OFDM symbols, may be referred to as “long” format PUCCH messages. Long format PUCCH messages, such as a large format PUCCH message with a time division multiplexed (TDM) DMRS, may be associated with large overhead.
The described techniques relate to improved methods, systems, devices, and apparatuses that support frequency division multiplexing (FDM) of a demodulation reference signal (DMRS). The DMRS and uplink control information (UCI) may be multiplexed in the frequency domain for a PUCCH message associated with at least 4 orthogonal frequency division multiplex (OFDM) symbols (“long” format PUCCH message). The long format PUCCH message may have a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveform. The FDM DMRS and UCI may reduce DMRS overhead while maintaining a peak-to-average power ratio (PAPR) (e.g., below a threshold PAPR) of the DFT-S-OFDM of the long format PUCCH message. The DMRS multiplexing pattern may be switched from time division multiplexing (TDM) to FDM for the long format PUCCH messages with DFT-s-OFDM waveform. The signaling indicating to switch from TDM to FDM may be dynamic, semi-static, or static. The signaling may be based on properties, such as a DMRS density in the frequency domain, a quantity of configured FDM DMRS symbols (e.g., symbols wherein UCI is FDM with DMRS), or a type of demodulation sequence of the DMRS.
A method for wireless communications by a UE is described. The method may include receiving control signaling including a configuration for an uplink control message, generating the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a DMRS that is FDM with UCI, and where the first uplink control message format is associated with a DFT-s-OFDM waveform and a quantity of four or more OFDM symbols, and transmitting the uplink control message using the DFT-s-OFDM waveform.
A UE for wireless communications is described. The UE may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively operable to execute the code to cause the UE to receive control signaling including a configuration for an uplink control message, generate the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a DMRS that is FDM with UCI, and where the first uplink control message format is associated with a DFT-s-OFDM waveform and a quantity of four or more OFDM symbols, and transmit the uplink control message using the DFT-s-OFDM waveform.
Another UE for wireless communications is described. The UE may include means for receiving control signaling including a configuration for an uplink control message, means for generating the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a DMRS that is FDM with UCI, and where the first uplink control message format is associated with a DFT-s-OFDM waveform and a quantity of four or more OFDM symbols, and means for transmitting the uplink control message using the DFT-s-OFDM waveform.
A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to receive control signaling including a configuration for an uplink control message, generate the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a DMRS that is FDM with UCI, and where the first uplink control message format is associated with a DFT-s-OFDM waveform and a quantity of four or more OFDM symbols, and transmit the uplink control message using the DFT-s-OFDM waveform.
In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the control signaling includes an indication to switch from TDM to FDM based on the first uplink control message format.
In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the indication to switch includes a dynamic indication, a semi-static indication, or a static indication.
In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the control signaling includes a radio resource control signaling.
In some examples of the method, UEs, and non-transitory computer-readable medium described herein, frequency division multiplexing the DMRS with the UCI may be based on a type of demodulation sequence associated with the DMRS.
In some examples of the method, UEs, and non-transitory computer-readable medium described herein, the type of demodulation sequence may be associated with a root index associated with the DMRS.
In some examples of the method, UEs, and non-transitory computer-readable medium described herein, frequency division multiplexing the DMRS with the UCI may be based on a DMRS density in a frequency domain.
In some examples of the method, UEs, and non-transitory computer-readable medium described herein, frequency division multiplexing the DMRS with the UCI may be based on a quantity of DMRS symbols that may be FDM with UCI in a slot.
Some examples of the method, UEs, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for generating a sidelink message including a DMRS FDM with sidelink control information and transmitting the sidelink message to a second UE.
In some examples of the method, UEs, and non-transitory computer-readable medium described herein, a second uplink control message format of the set of multiple uplink control message formats may be associated with a CP-OFDM waveform and a quantity of two or fewer OFDM symbols.
A method for wireless communications by a network entity is described. The method may include outputting control signaling including a configuration for an uplink control message, obtaining the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a DMRS that is FDM with UCI, and where the first uplink control message format is associated with a DFT-s-OFDM waveform and a quantity of four or more OFDM symbols, and decoding the uplink control message based on the configuration.
A network entity for wireless communications is described. The network entity may include one or more memories storing processor executable code, and one or more processors coupled with the one or more memories. The one or more processors may individually or collectively operable to execute the code to cause the network entity to output control signaling including a configuration for an uplink control message, obtain the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a DMRS that is FDM with UCI, and where the first uplink control message format is associated with a DFT-s-OFDM waveform and a quantity of four or more OFDM symbols, and decode the uplink control message based on the configuration.
Another network entity for wireless communications is described. The network entity may include means for outputting control signaling including a configuration for an uplink control message, means for obtaining the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a DMRS that is FDM with UCI, and where the first uplink control message format is associated with a DFT-s-OFDM waveform and a quantity of four or more OFDM symbols, and means for decoding the uplink control message based on the configuration.
A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to output control signaling including a configuration for an uplink control message, obtain the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a DMRS that is FDM with UCI, and where the first uplink control message format is associated with a DFT-s-OFDM waveform and a quantity of four or more OFDM symbols, and decode the uplink control message based on the configuration.
Some examples of the method, network entities, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for outputting a downlink control message, the downlink control message including a DMRS FDM with downlink control information, where the downlink control message utilizes a DFT-s-OFDM waveform.
In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the control signaling includes an indication to switch from TDM to FDM based on the first uplink control message format.
In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the indication to switch includes a dynamic indication, a semi-static indication, or a static indication.
In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the control signaling includes a radio resource control signaling.
In some examples of the method, network entities, and non-transitory computer-readable medium described herein, frequency division multiplexing the DMRS with the UCI may be based on a type of demodulation sequence associated with the DMRS.
In some examples of the method, network entities, and non-transitory computer-readable medium described herein, the type of demodulation sequence may be associated with a root index associated with the DMRS.
In some examples of the method, network entities, and non-transitory computer-readable medium described herein, frequency division multiplexing the DMRS with the UCI may be based on a DMRS density in a frequency domain.
In some examples of the method, network entities, and non-transitory computer-readable medium described herein, frequency division multiplexing the DMRS with the UCI may be based on a quantity of DMRS symbols that may be FDM with UCI in a slot.
In some examples of the method, network entities, and non-transitory computer-readable medium described herein, a second uplink control message format of the set of multiple uplink control message formats may be associated with a CP-OFDM waveform and a quantity of two or fewer OFDM symbols.
Some wireless communications systems may support multiple formats for physical uplink control channel (PUCCH) messages from a user equipment (UE). The formats may be classified based on physical resource allocation including the length of orthogonal frequency division multiplex (OFDM) symbols or the quantity of bits that the PUCCH message carries. As described herein, PUCCH message formats that are associated with a quantity of less than 4 OFDM symbols, such as 1 to 2 OFDM symbols, may be referred to as “short” format PUCCH messages. Formats that are associated with a quantity of 4 or more OFDM symbols, such as 4 to 14 OFDM symbols, may be referred to as “long” format PUCCH messages. The long format PUCCH messages may include a demodulation reference signal (DMRS) that is multiplexed with uplink control information (UCI) in the time domain (e.g., time division multiplexed (TDM)) while the short format PUCCH messages may include DMRS multiplexed with UCI in the frequency domain (e.g., frequency division multiplexed (FDM)). However, long format PUCCH messages, such as a large format PUCCH message with TDM DMRS, may be associated with large overhead. The large overhead may result in reduced quantity of UCI that may be included in the long format PUCCH message.
The DMRS and the UCI may be multiplexed in the frequency domain (e.g., FDM) for a long format PUCCH with a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveform. The FDM DMRS and UCI may reduce DMRS overhead while maintaining a peak-to-average power ratio (PAPR) (e.g., below a threshold PAPR) of the DFT-S-OFDM waveform of the long format PUCCH. The DMRS multiplexing pattern may be switched from TDM to FDM for Long PUCCH format with DFT-s-OFDM waveform. The signaling indicating to switch from TDM to FDM may be dynamic, semi-static, or static. The signaling may be based on properties, such as a DMRS density in the frequency domain, a quantity of configured FDM DMRS symbols (e.g., symbols wherein UCI is FDM with DMRS), or a type of demodulation sequence of the DMRS.
Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to FDM of the DMRS.
The network entities 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may include devices in different forms or having different capabilities. In various examples, a network entity 105 may be referred to as a network element, a mobility element, a radio access network (RAN) node, or network equipment, among other nomenclature. In some examples, network entities 105 and UEs 115 may wirelessly communicate via one or more communication links 125 (e.g., a radio frequency (RF) access link). For example, a network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) over which the UEs 115 and the network entity 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which a network entity 105 and a UE 115 may support the communication of signals according to one or more radio access technologies (RATs).
The UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in
As described herein, a node of the wireless communications system 100, which may be referred to as a network node, or a wireless node, may be a network entity 105 (e.g., any network entity described herein), a UE 115 (e.g., any UE described herein), a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, a node may be a UE 115. As another example, a node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In yet other aspects of this example, the first, second, and third nodes may be different relative to these examples. Similarly, reference to a UE 115, network entity 105, apparatus, device, computing system, or the like may include disclosure of the UE 115, network entity 105, apparatus, device, computing system, or the like being a node. For example, disclosure that a UE 115 is configured to receive information from a network entity 105 also discloses that a first node is configured to receive information from a second node.
In some examples, network entities 105 may communicate with the core network 130, or with one another, or both. For example, network entities 105 may communicate with the core network 130 via one or more backhaul communication links 120 (e.g., in accordance with an S1, N2, N3, or other interface protocol). In some examples, network entities 105 may communicate with one another via a backhaul communication link 120 (e.g., in accordance with an X2, Xn, or other interface protocol) either directly (e.g., directly between network entities 105) or indirectly (e.g., via a core network 130). In some examples, network entities 105 may communicate with one another via a midhaul communication link 162 (e.g., in accordance with a midhaul interface protocol) or a fronthaul communication link 168 (e.g., in accordance with a fronthaul interface protocol), or any combination thereof. The backhaul communication links 120, midhaul communication links 162, or fronthaul communication links 168 may be or include one or more wired links (e.g., an electrical link, an optical fiber link), one or more wireless links (e.g., a radio link, a wireless optical link), among other examples or various combinations thereof. A UE 115 may communicate with the core network 130 via a communication link 155.
One or more of the network entities 105 described herein may include or may be referred to as a base station 140 (e.g., a base transceiver station, a radio base station, an NR base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB), a 5G NB, a next-generation eNB (ng-eNB), a Home NodeB, a Home eNodeB, or other suitable terminology). In some examples, a network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture, which may be configured to utilize a protocol stack that is physically or logically integrated within a single network entity 105 (e.g., a single RAN node, such as a base station 140).
In some examples, a network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture), which may be configured to utilize a protocol stack that is physically or logically distributed among two or more network entities 105, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance), or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN)). For example, a network entity 105 may include one or more of a central unit (CU) 160, a distributed unit (DU) 165, a radio unit (RU) 170, a RAN Intelligent Controller (RIC) 175 (e.g., a Near-Real Time RIC (Near-RT RIC), a Non-Real Time RIC (Non-RT RIC)), a Service Management and Orchestration (SMO) 180 system, or any combination thereof. An RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmission reception point (TRP). One or more components of the network entities 105 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 105 may be located in distributed locations (e.g., separate physical locations). In some examples, one or more network entities 105 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU), a virtual DU (VDU), a virtual RU (VRU)).
The split of functionality between a CU 160, a DU 165, and an RU 170 is flexible and may support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combinations thereof) are performed at a CU 160, a DU 165, or an RU 170. For example, a functional split of a protocol stack may be employed between a CU 160 and a DU 165 such that the CU 160 may support one or more layers of the protocol stack and the DU 165 may support one or more different layers of the protocol stack. In some examples, the CU 160 may host upper protocol layer (e.g., layer 3 (L3), layer 2 (L2)) functionality and signaling (e.g., Radio Resource Control (RRC), service data adaption protocol (SDAP), Packet Data Convergence Protocol (PDCP)). The CU 160 may be connected to one or more DUs 165 or RUs 170, and the one or more DUs 165 or RUs 170 may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU 165 and an RU 170 such that the DU 165 may support one or more layers of the protocol stack and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or multiple different cells (e.g., via one or more RUs 170). In some cases, a functional split between a CU 160 and a DU 165, or between a DU 165 and an RU 170 may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU 160, a DU 165, or an RU 170, while other functions of the protocol layer are performed by a different one of the CU 160, the DU 165, or the RU 170). A CU 160 may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU 160 may be connected to one or more DUs 165 via a midhaul communication link 162 (e.g., F1, F1-c, F1-u), and a DU 165 may be connected to one or more RUs 170 via a fronthaul communication link 168 (e.g., open fronthaul (FH) interface). In some examples, a midhaul communication link 162 or a fronthaul communication link 168 may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities 105 that are in communication via such communication links.
In wireless communications systems (e.g., wireless communications system 100), infrastructure and spectral resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, providing an IAB network architecture (e.g., to a core network 130). In some cases, in an IAB network, one or more network entities 105 (e.g., IAB nodes 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as a donor entity or an IAB donor. One or more DUs 165 or one or more RUs 170 may be partially controlled by one or more CUs 160 associated with a donor network entity 105 (e.g., a donor base station 140). The one or more donor network entities 105 (e.g., IAB donors) may be in communication with one or more additional network entities 105 (e.g., IAB nodes 104) via supported access and backhaul links (e.g., backhaul communication links 120). IAB nodes 104 may include an IAB mobile termination (IAB-MT) controlled (e.g., scheduled) by DUs 165 of a coupled IAB donor. An IAB-MT may include an independent set of antennas for relay of communications with UEs 115, or may share the same antennas (e.g., of an RU 170) of an IAB node 104 used for access via the DU 165 of the IAB node 104 (e.g., referred to as virtual IAB-MT (vIAB-MT)). In some examples, the IAB nodes 104 may include DUs 165 that support communication links with additional entities (e.g., IAB nodes 104, UEs 115) within the relay chain or configuration of the access network (e.g., downstream). In such cases, one or more components of the disaggregated RAN architecture (e.g., one or more IAB nodes 104 or components of IAB nodes 104) may be configured to operate according to the techniques described herein.
In the case of the techniques described herein applied in the context of a disaggregated RAN architecture, one or more components of the disaggregated RAN architecture may be configured to support FDM of the DMRS as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally, or alternatively, be performed by one or more components of the disaggregated RAN architecture (e.g., IAB nodes 104, DUs 165, CUs 160, RUs 170, RIC 175, SMO 180).
A UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples.
The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays as well as the network entities 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in
The UEs 115 and the network entities 105 may wirelessly communicate with one another via one or more communication links 125 (e.g., an access link) using resources associated with one or more carriers. The term “carrier” may refer to a set of RF spectrum resources having a defined physical layer structure for supporting the communication links 125. For example, a carrier used for a communication link 125 may include a portion of a RF spectrum band (e.g., a bandwidth part (BWP)) that is operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers. Communication between a network entity 105 and other devices may refer to communication between the devices and any portion (e.g., entity, sub-entity) of a network entity 105. For example, the terms “transmitting,” “receiving,” or “communicating,” when referring to a network entity 105, may refer to any portion of a network entity 105 (e.g., a base station 140, a CU 160, a DU 165, a RU 170) of a RAN communicating with another device (e.g., directly or via one or more other network entities 105).
In some examples, such as in a carrier aggregation configuration, a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute RF channel number (EARFCN)) and may be identified according to a channel raster for discovery by the UEs 115. A carrier may be operated in a standalone mode, in which case initial acquisition and connection may be conducted by the UEs 115 via the carrier, or the carrier may be operated in a non-standalone mode, in which case a connection is anchored using a different carrier (e.g., of the same or a different radio access technology).
The communication links 125 shown in the wireless communications system 100 may include downlink transmissions (e.g., forward link transmissions) from a network entity 105 to a UE 115, uplink transmissions (e.g., return link transmissions) from a UE 115 to a network entity 105, or both, among other configurations of transmissions. Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode).
A carrier may be associated with a particular bandwidth of the RF spectrum and, in some examples, the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100. For example, the carrier bandwidth may be one of a set of bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). Devices of the wireless communications system 100 (e.g., the network entities 105, the UEs 115, or both) may have hardware configurations that support communications using a particular carrier bandwidth or may be configurable to support communications using one of a set of carrier bandwidths. In some examples, the wireless communications system 100 may include network entities 105 or UEs 115 that support concurrent communications using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured for operating using portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth.
Signal waveforms transmitted via a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may refer to resources of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, in which case the symbol period and subcarrier spacing may be inversely related. The quantity of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both), such that a relatively higher quantity of resource elements (e.g., in a transmission duration) and a relatively higher order of a modulation scheme may correspond to a relatively higher rate of communication. A wireless communications resource may refer to a combination of an RF spectrum resource, a time resource, and a spatial resource (e.g., a spatial layer, a beam), and the use of multiple spatial resources may increase the data rate or data integrity for communications with a UE 115.
The time intervals for the network entities 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of Ts=1/(Δfmax·Nf) seconds, for which Δfmax may represent a supported subcarrier spacing, and Nf may represent a supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).
Each frame may include multiple consecutively-numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a quantity of slots. Alternatively, each frame may include a variable quantity of slots, and the quantity of slots may depend on subcarrier spacing. Each slot may include a quantity of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period). In some wireless communications systems 100, a slot may further be divided into multiple mini-slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., Nf) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.
A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., a quantity of symbol periods in a TTI) may be variable. Additionally, or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).
Physical channels may be multiplexed for communication using a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed for signaling via a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a set of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115. For example, one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to an amount of control channel resources (e.g., control channel elements (CCEs)) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space sets configured for sending control information to multiple UEs 115 and UE-specific search space sets for sending control information to a specific UE 115.
In some examples, a network entity 105 (e.g., a base station 140, an RU 170) may be movable and therefore provide communication coverage for a moving coverage area 110. In some examples, different coverage areas 110 associated with different technologies may overlap, but the different coverage areas 110 may be supported by the same network entity 105. In some other examples, the overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the network entities 105 provide coverage for various coverage areas 110 using the same or different radio access technologies.
The wireless communications system 100 may support synchronous or asynchronous operation. For synchronous operation, network entities 105 (e.g., base stations 140) may have similar frame timings, and transmissions from different network entities 105 may be approximately aligned in time. For asynchronous operation, network entities 105 may have different frame timings, and transmissions from different network entities 105 may, in some examples, not be aligned in time. The techniques described herein may be used for either synchronous or asynchronous operations.
Some UEs 115, such as MTC or IoT devices, may be low cost or low complexity devices and may provide for automated communication between machines (e.g., via Machine-to-Machine (M2M) communication). M2M communication or MTC may refer to data communication technologies that allow devices to communicate with one another or a network entity 105 (e.g., a base station 140) without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application program that uses the information or presents the information to humans interacting with the application program. Some UEs 115 may be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.
Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception concurrently). In some examples, half-duplex communications may be performed at a reduced peak rate. Other power conservation techniques for the UEs 115 include entering a power saving deep sleep mode when not engaging in active communications, operating using a limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured for operation using a narrowband protocol type that is associated with a defined portion or range (e.g., set of subcarriers or resource blocks (RBs)) within a carrier, within a guard-band of a carrier, or outside of a carrier.
The wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC). The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communications may include private communication or group communication and may be supported by one or more services such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.
In some examples, a UE 115 may be configured to support communicating directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., in accordance with a peer-to-peer (P2P), D2D, or sidelink protocol). In some examples, one or more UEs 115 of a group that are performing D2D communications may be within the coverage area 110 of a network entity 105 (e.g., a base station 140, an RU 170), which may support aspects of such D2D communications being configured by (e.g., scheduled by) the network entity 105. In some examples, one or more UEs 115 of such a group may be outside the coverage area 110 of a network entity 105 or may be otherwise unable to or not configured to receive transmissions from a network entity 105. In some examples, groups of the UEs 115 communicating via D2D communications may support a one-to-many (1: M) system in which each UE 115 transmits to each of the other UEs 115 in the group. In some examples, a network entity 105 may facilitate the scheduling of resources for D2D communications. In some other examples, D2D communications may be carried out between the UEs 115 without an involvement of a network entity 105.
In some systems, a D2D communication link 135 may be an example of a communication channel, such as a sidelink communication channel, between vehicles (e.g., UEs 115). In some examples, vehicles may communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination of these. A vehicle may signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information relevant to a V2X system. In some examples, vehicles in a V2X system may communicate with roadside infrastructure, such as roadside units, or with the network via one or more network nodes (e.g., network entities 105, base stations 140, RUs 170) using vehicle-to-network (V2N) communications, or with both.
The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or 5G core (5GC), which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW), a Packet Data Network (PDN) gateway (P-GW), or a user plane function (UPF)). The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the network entities 105 (e.g., base stations 140) associated with the core network 130. User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to IP services 150 for one or more network operators. The IP services 150 may include access to the Internet, Intranet(s), an IP Multimedia Subsystem (IMS), or a Packet-Switched Streaming Service.
The wireless communications system 100 may operate using one or more frequency bands, which may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, which may be referred to as clusters, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to communications using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
The wireless communications system 100 may also operate using a super high frequency (SHF) region, which may be in the range of 3 GHz to 30 GHz, also known as the centimeter band, or using an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz), also known as the millimeter band. In some examples, the wireless communications system 100 may support millimeter wave (mmW) communications between the UEs 115 and the network entities 105 (e.g., base stations 140, RUs 170), and EHF antennas of the respective devices may be smaller and more closely spaced than UHF antennas. In some examples, such techniques may facilitate using antenna arrays within a device. The propagation of EHF transmissions, however, may be subject to even greater attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions may differ by country or regulating body.
The wireless communications system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, the wireless communications system 100 may employ License Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technology using an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. While operating using unlicensed RF spectrum bands, devices such as the network entities 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operations using unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating using a licensed band (e.g., LAA). Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.
A network entity 105 (e.g., a base station 140, an RU 170) or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of a network entity 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with a network entity 105 may be located at diverse geographic locations. A network entity 105 may include an antenna array with a set of rows and columns of antenna ports that the network entity 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may include one or more antenna arrays that may support various MIMO or beamforming operations. Additionally, or alternatively, an antenna panel may support RF beamforming for a signal transmitted via an antenna port.
Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating along particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation).
The wireless communications system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or PDCP layer may be IP-based. An RLC layer may perform packet segmentation and reassembly to communicate via logical channels. A MAC layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer also may implement error detection techniques, error correction techniques, or both to support retransmissions to improve link efficiency. In the control plane, an RRC layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a network entity 105 or a core network 130 supporting radio bearers for user plane data. A PHY layer may map transport channels to physical channels.
The wireless communications system 100 may be a 5G NR systems that supports multiple formats for PUCCH messages from a UE 115, where the format of the PUCCH message may be based on a UCI payload (e.g., quantity of bits carried by PUCCH message), physical resource allocation including the length of OFDM symbols, quantity of physical resource blocks (PRBs), or any combination thereof. For example, the formats may include the following:
For example, formats that are associated with a quantity of less than 4 OFDM symbols, such as 1 to 2 OFDM symbols, may be referred to as “short” format PUCCH messages and formats that are associated with a quantity of at least 4 OFDM symbols, such as 4 to 14 OFDM symbols, may be referred to as “long” format PUCCH messages. Accordingly, formats 0 and 2 may be referred to as short format PUCCH messages and formats 1, 3, and 4 may be referred to as long format PUCCH messages. Short format PUCCH messages may be based on cyclic prefix (CP) OFDM (CP-OFDM) waveform with FDM DMRS with UCI. The short format PUCCH message may have less than 50% DMRS density in one OFDM symbol. Long format PUCCH messages may be based on DFT-s-OFDM waveform (e.g., for coverage enhancement) with TDM DMRS and UCI with greater than 50% DMRS in a slot. The UCI may be based on either binary phase shift keying (BPSK) modulation (e.g., π/2 BPSK) or quadrature phase shift keying (QPSK) modulation.
As discussed herein, the long format PUCCH message with DFT-s-OFDM may include FDM DMRS and UCI. The DFT-s-OFDM waveform may enable multiplexing in the frequency domain but may also be associated with PAPR loss of the waveform (e.g., PAPR cost). In some examples, such as long format PUCCH message that have a large DMRS overhead, reducing the DMRS overhead may enable the PUCCH message to carry more UCI. For example, the TDM DMRS overhead for the PUCCH message format 3 may be below 50%. To reduce DMRS overhead on the long format PUCCH messages, such as format 3, the DMRS may be FDM with the UCI without reducing the PAPR to below a PAPR threshold, such that channel estimation may not be impacted below a performance threshold. In some examples, such as high doppler scenarios, the DMRS overhead may be reduced. In such examples, dedicated DMRS symbols may be configured (i.e., TDM DMRS and data). However, by FDM DMRS and UCI for long format PUCCH messages, the DMRS overhead may be further reduced. Also, FDM of DMRS and UCI may result in better rate matching (i.e., more coding gain) and may reduce block error rate (BLER) performance (e.g., end-to-end BLER performance).
In some examples, the UE 115-a may perform various processes to provide the FDM DMRS with UCI in DFT-s-OFDM. For example, a processing block chain of the UE 115-a for the FDM of the DMRS with UCI may include the following:
The block chain may involve multiple inputs, outputs, and functions (e.g., quantity of subcarriers (N), data subcarriers (Na), pilot tones (Np)), and quantity of available OFDM symbols or sequence (M)) that include the UCI data, serial-to-parallel (S/P) function, DFT function, DMRS data, frequency mapping between data and reference signals (RS), subcarrier mapping, N-point inverse fast Fourier transform (IFFT) function, parallel-to-serial (P/S) function, and the cyclic prefix function (CP+).
In some examples, the FDM may not impact the PAPR of DFTs, such that the PAPR is below a threshold PAPR. For example, normalized squared amplitude of the FDM signal may be impacted by a Zadoff-Chu (ZC) sequence root index and DMRS density in the frequency domain. In such examples, the PAPR performance may be the same at a 10−4 complementary cumulative distribution function (CCDF) point when the QPSK modulated UCI is FDM with ZC DMRS having a specific root index. The loss in in PAPR may be 0.6 decibels (dB) on average when the QPSK modulated UCI is FDM with frequency domain ZC DMRS with 50% density in the frequency domain. The loss in PAPR may be compensated by better coding gain provided by FDM, for example, in comparison to TDM. In some examples, TDM DMRS tones that are power boosted may have similar results to FDM DMRS tones that are not power boosted, indicating that PAPR loss is still below a threshold PAPR.
In the wireless communications system 200, the UE 115-a may transmit the FDM DMRS with UCI to the network entity 105-a. For example, the network entity 105-a may communicate with the UE 115-a using a communication link 125. In some examples, the communication link 125 may include a first channel 225-a for transmitting data from the UE 115-a to the network entity 105-a and a second channel 225-b for transmitting data from the network entity 105-a to the UE 115-a. The communication link 125 may be an example of an NR or LTE link between the UE 115-a and the network entity 105-a. The communication link 125 may include a bi-directional link that enables both uplink and downlink communications, for example, via the channels 225.
The UE 115-a may transmit uplink messages 245 (e.g., uplink transmissions), such as uplink control signals or uplink data signals, to the network entity 105-a using the first channel 225-a (e.g., of the communication link 125) and the network entity 105-a may transmit downlink messages 250 (e.g., downlink transmissions), such as downlink control signals or downlink data signals, to the UE 115-a using the second channel 225-b (e.g., of the communication link 125). In some examples, downlink messages 250 may be part of control signaling transmitted from the network entity 105-a.
The network entity 105-a may transmit a downlink message 250, which may include configuration for an uplink message 245. The configuration may indicate to the UE 115-a to switch from TDM to FDM based on the uplink message format. For example, if the uplink message 245 is a long format PUCCH message, then the UE 115-a may switch or continue using FDM. The long format PUCCH messages may include format 1, 3, and 4. In some examples, the downlink message 250 may be an RRC signal. The indication to switch via the downlink message 250 may be dynamic, semi-static, or static.
The UE 115-a may transmit an uplink message 245 to the network entity 105-a using the DFT-s-OFDM waveform. The uplink message 245 may be generated by the UE 115-a in accordance with the configuration provided in the downlink message 250. The uplink message 245 may be associated with 4 or more OFDM symbols and may have a format from multiple uplink message formats (e.g., format 1, 3, or 4). The uplink message 245 may include a DMRS signal that is FDM with UCI. In some examples, the FDM DMRS with the UCI may be based on a quantity of DMRS symbols that are FDM with UCI in a slot.
At 305, the UE 115-b may receive control signaling including a configuration for an uplink control message. The control signaling may include an indication to switch from TDM to FDM based on the first uplink control message format. The indication to switch may include a dynamic indication, a semi-static indication, or a static indication. The control signaling may include an RRC signaling.
At 310, the UE 115-b may generate the uplink control message in accordance with the configuration and a first uplink control message format from multiple uplink control message formats. The uplink control message may include a DMRS that is FDM with UCI. The first uplink control message format may be associated with a DFT-s-OFDM waveform and a quantity of four or more OFDM symbols. In some examples, the FDM DMRS with the UCI may be based on a type of demodulation sequence associated with the DMRS. The type of demodulation sequence may be associated with a root index associated with the demodulation reference signal. In some examples, the FDM DMRS with the UCI may be based on a DMRS density in a frequency domain. Also, the FDM DMRS with the UCI may be based on a quantity of DMRS symbols that are FDM with UCI in a slot.
At 315, the UE 115-b may transmit the uplink control message using the DFT-s-OFDM waveform. In some examples, at 320, the UE 115-b, may generate a sidelink message including a DMRS FDM with sidelink control information. In some examples, at 325, the UE 115-b may transmit the sidelink message to the second UE 115-c.
The receiver 410 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to FDM of the DMRS). Information may be passed on to other components of the device 405. The receiver 410 may utilize a single antenna or a set of multiple antennas.
The transmitter 415 may provide a means for transmitting signals generated by other components of the device 405. For example, the transmitter 415 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to FDM of the DMRS). In some examples, the transmitter 415 may be co-located with a receiver 410 in a transceiver module. The transmitter 415 may utilize a single antenna or a set of multiple antennas.
The communications manager 420, the receiver 410, the transmitter 415, or various combinations thereof or various components thereof may be examples of means for performing various aspects of FDM of the DMRS as described herein. For example, the communications manager 420, the receiver 410, the transmitter 415, or various combinations or components thereof may be capable of performing one or more of the functions described herein.
In some examples, the communications manager 420, the receiver 410, the transmitter 415, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry). The hardware may include at least one of a processor, a digital signal processor (DSP), a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure. In some examples, at least one processor and at least one memory coupled with the at least one processor may be configured to perform one or more of the functions described herein (e.g., by one or more processors, individually or collectively, executing instructions stored in the at least one memory).
Additionally, or alternatively, the communications manager 420, the receiver 410, the transmitter 415, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by at least one processor. If implemented in code executed by at least one processor, the functions of the communications manager 420, the receiver 410, the transmitter 415, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure).
In some examples, the communications manager 420 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 410, the transmitter 415, or both. For example, the communications manager 420 may receive information from the receiver 410, send information to the transmitter 415, or be integrated in combination with the receiver 410, the transmitter 415, or both to obtain information, output information, or perform various other operations as described herein.
The communications manager 420 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 420 is capable of, configured to, or operable to support a means for receiving control signaling including a configuration for an uplink control message. The communications manager 420 is capable of, configured to, or operable to support a means for generating the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a demodulation reference signal that is frequency division multiplexed with uplink control information, and where the first uplink control message format is associated with a discrete Fourier transform spread orthogonal frequency division multiplexing waveform and a quantity of four or more orthogonal frequency division multiplex symbols. The communications manager 420 is capable of, configured to, or operable to support a means for transmitting the uplink control message using the discrete Fourier transform spread orthogonal frequency division multiplexing waveform.
By including or configuring the communications manager 420 in accordance with examples as described herein, the device 405 (e.g., at least one processor controlling or otherwise coupled with the receiver 410, the transmitter 415, the communications manager 420, or a combination thereof) may support techniques for reducing overhead in a PUCCH message and increasing quantity of UCI that may be included in the message, while maintaining a PAPR above a PAPR threshold.
The receiver 510 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to FDM of the DMRS). Information may be passed on to other components of the device 505. The receiver 510 may utilize a single antenna or a set of multiple antennas.
The transmitter 515 may provide a means for transmitting signals generated by other components of the device 505. For example, the transmitter 515 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to FDM of the DMRS). In some examples, the transmitter 515 may be co-located with a receiver 510 in a transceiver module. The transmitter 515 may utilize a single antenna or a set of multiple antennas.
The device 505, or various components thereof, may be an example of means for performing various aspects of FDM of the DMRS as described herein. For example, the communications manager 520 may include a control signaling reception manager 525, an uplink message generation manager 530, an uplink message transmission manager 535, or any combination thereof. The communications manager 520 may be an example of aspects of a communications manager 420 as described herein. In some examples, the communications manager 520, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 510, the transmitter 515, or both. For example, the communications manager 520 may receive information from the receiver 510, send information to the transmitter 515, or be integrated in combination with the receiver 510, the transmitter 515, or both to obtain information, output information, or perform various other operations as described herein.
The communications manager 520 may support wireless communications in accordance with examples as disclosed herein. The control signaling reception manager 525 is capable of, configured to, or operable to support a means for receiving control signaling including a configuration for an uplink control message. The uplink message generation manager 530 is capable of, configured to, or operable to support a means for generating the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a demodulation reference signal that is frequency division multiplexed with uplink control information, and where the first uplink control message format is associated with a discrete Fourier transform spread orthogonal frequency division multiplexing waveform and a quantity of four or more orthogonal frequency division multiplex symbols. The uplink message transmission manager 535 is capable of, configured to, or operable to support a means for transmitting the uplink control message using the discrete Fourier transform spread orthogonal frequency division multiplexing waveform.
The communications manager 620 may support wireless communications in accordance with examples as disclosed herein. The control signaling reception manager 625 is capable of, configured to, or operable to support a means for receiving control signaling including a configuration for an uplink control message. The uplink message generation manager 630 is capable of, configured to, or operable to support a means for generating the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a demodulation reference signal that is frequency division multiplexed with uplink control information, and where the first uplink control message format is associated with a discrete Fourier transform spread orthogonal frequency division multiplexing waveform and a quantity of four or more orthogonal frequency division multiplex symbols. The uplink message transmission manager 635 is capable of, configured to, or operable to support a means for transmitting the uplink control message using the discrete Fourier transform spread orthogonal frequency division multiplexing waveform.
In some examples, the control signaling includes an indication to switch from time division multiplexing to frequency division multiplexing based on the first uplink control message format.
In some examples, the indication to switch includes a dynamic indication, a semi-static indication, or a static indication.
In some examples, the control signaling includes a radio resource control signaling.
In some examples, frequency division multiplexing the demodulation reference signal with the uplink control information is based on a type of demodulation sequence associated with the demodulation reference signal.
In some examples, the type of demodulation sequence is associated with a root index associated with the demodulation reference signal.
In some examples, frequency division multiplexing the demodulation reference signal with the uplink control information is based on a demodulation reference signal density in a frequency domain.
In some examples, frequency division multiplexing the demodulation reference signal with the uplink control information is based on a quantity of demodulation reference signal symbols that are frequency division multiplexed with uplink control information in a slot.
In some examples, the sidelink message generation manager 640 is capable of, configured to, or operable to support a means for generating a sidelink message including a demodulation reference signal frequency division multiplexed with sidelink control information. In some examples, the sidelink message transmission manager 645 is capable of, configured to, or operable to support a means for transmitting the sidelink message to a second UE.
In some examples, a second uplink control message format of the set of multiple uplink control message formats is associated with a cyclic prefix orthogonal frequency division multiplexing waveform and a quantity of two or fewer orthogonal frequency division multiplex symbols.
The I/O controller 710 may manage input and output signals for the device 705. The I/O controller 710 may also manage peripherals not integrated into the device 705. In some cases, the I/O controller 710 may represent a physical connection or port to an external peripheral. In some cases, the I/O controller 710 may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operating system. Additionally, or alternatively, the I/O controller 710 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I/O controller 710 may be implemented as part of one or more processors, such as the at least one processor 740. In some cases, a user may interact with the device 705 via the I/O controller 710 or via hardware components controlled by the I/O controller 710.
In some cases, the device 705 may include a single antenna 725. However, in some other cases, the device 705 may have more than one antenna 725, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 715 may communicate bi-directionally, via the one or more antennas 725, wired, or wireless links as described herein. For example, the transceiver 715 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 715 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 725 for transmission, and to demodulate packets received from the one or more antennas 725. The transceiver 715, or the transceiver 715 and one or more antennas 725, may be an example of a transmitter 415, a transmitter 515, a receiver 410, a receiver 510, or any combination thereof or component thereof, as described herein.
The at least one memory 730 may include random access memory (RAM) and read-only memory (ROM). The at least one memory 730 may store computer-readable, computer-executable code 735 including instructions that, when executed by the at least one processor 740, cause the device 705 to perform various functions described herein. The code 735 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 735 may not be directly executable by the at least one processor 740 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 730 may contain, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
The at least one processor 740 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the at least one processor 740 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the at least one processor 740. The at least one processor 740 may be configured to execute computer-readable instructions stored in a memory (e.g., the at least one memory 730) to cause the device 705 to perform various functions (e.g., functions or tasks supporting FDM of the DMRS). For example, the device 705 or a component of the device 705 may include at least one processor 740 and at least one memory 730 coupled with or to the at least one processor 740, the at least one processor 740 and at least one memory 730 configured to perform various functions described herein. In some examples, the at least one processor 740 may include multiple processors and the at least one memory 730 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein. In some examples, the at least one processor 740 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 740) and memory circuitry (which may include the at least one memory 730)), or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. As such, the at least one processor 740 or a processing system including the at least one processor 740 may be configured to, configurable to, or operable to cause the device 705 to perform one or more of the functions described herein. Further, as described herein, being “configured to,” being “configurable to,” and being “operable to” may be used interchangeably and may be associated with a capability, when executing code stored in the at least one memory 730 or otherwise, to perform one or more of the functions described herein.
The communications manager 720 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 720 is capable of, configured to, or operable to support a means for receiving control signaling including a configuration for an uplink control message. The communications manager 720 is capable of, configured to, or operable to support a means for generating the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a demodulation reference signal that is frequency division multiplexed with uplink control information, and where the first uplink control message format is associated with a discrete Fourier transform spread orthogonal frequency division multiplexing waveform and a quantity of four or more orthogonal frequency division multiplex symbols. The communications manager 720 is capable of, configured to, or operable to support a means for transmitting the uplink control message using the discrete Fourier transform spread orthogonal frequency division multiplexing waveform.
By including or configuring the communications manager 720 in accordance with examples as described herein, the device 705 may support techniques for reducing overhead in a PUCCH message and increasing quantity of UCI that may be included in the message, while maintaining a PAPR above a PAPR threshold.
In some examples, the communications manager 720 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver 715, the one or more antennas 725, or any combination thereof. Although the communications manager 720 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 720 may be supported by or performed by the at least one processor 740, the at least one memory 730, the code 735, or any combination thereof. For example, the code 735 may include instructions executable by the at least one processor 740 to cause the device 705 to perform various aspects of FDM of the DMRS as described herein, or the at least one processor 740 and the at least one memory 730 may be otherwise configured to, individually or collectively, perform or support such operations.
The receiver 810 may provide a means for obtaining (e.g., receiving, determining, identifying) information such as user data, control information, or any combination thereof (e.g., I/Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack). Information may be passed on to other components of the device 805. In some examples, the receiver 810 may support obtaining information by receiving signals via one or more antennas. Additionally, or alternatively, the receiver 810 may support obtaining information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.
The transmitter 815 may provide a means for outputting (e.g., transmitting, providing, conveying, sending) information generated by other components of the device 805. For example, the transmitter 815 may output information such as user data, control information, or any combination thereof (e.g., I/Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack). In some examples, the transmitter 815 may support outputting information by transmitting signals via one or more antennas. Additionally, or alternatively, the transmitter 815 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 815 and the receiver 810 may be co-located in a transceiver, which may include or be coupled with a modem.
The communications manager 820, the receiver 810, the transmitter 815, or various combinations thereof or various components thereof may be examples of means for performing various aspects of FDM of the DMRS as described herein. For example, the communications manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be capable of performing one or more of the functions described herein.
In some examples, the communications manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry). The hardware may include at least one of a processor, a DSP, a CPU, an ASIC, an FPGA or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure. In some examples, at least one processor and at least one memory coupled with the at least one processor may be configured to perform one or more of the functions described herein (e.g., by one or more processors, individually or collectively, executing instructions stored in the at least one memory).
Additionally, or alternatively, the communications manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by at least one processor. If implemented in code executed by at least one processor, the functions of the communications manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting, individually or collectively, a means for performing the functions described in the present disclosure).
In some examples, the communications manager 820 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 810, the transmitter 815, or both. For example, the communications manager 820 may receive information from the receiver 810, send information to the transmitter 815, or be integrated in combination with the receiver 810, the transmitter 815, or both to obtain information, output information, or perform various other operations as described herein.
The communications manager 820 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 820 is capable of, configured to, or operable to support a means for outputting control signaling including a configuration for an uplink control message. The communications manager 820 is capable of, configured to, or operable to support a means for obtaining the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a demodulation reference signal that is frequency division multiplexed with uplink control information, and where the first uplink control message format is associated with a discrete Fourier transform spread orthogonal frequency division multiplexing waveform and a quantity of four or more orthogonal frequency division multiplex symbols. The communications manager 820 is capable of, configured to, or operable to support a means for decoding the uplink control message based on the configuration.
By including or configuring the communications manager 820 in accordance with examples as described herein, the device 805 (e.g., at least one processor controlling or otherwise coupled with the receiver 810, the transmitter 815, the communications manager 820, or a combination thereof) may support techniques for reducing overhead in a PUCCH message and increasing quantity of UCI that may be included in the message, while maintaining a PAPR above a PAPR threshold.
The receiver 910 may provide a means for obtaining (e.g., receiving, determining, identifying) information such as user data, control information, or any combination thereof (e.g., I/Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack). Information may be passed on to other components of the device 905. In some examples, the receiver 910 may support obtaining information by receiving signals via one or more antennas. Additionally, or alternatively, the receiver 910 may support obtaining information by receiving signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof.
The transmitter 915 may provide a means for outputting (e.g., transmitting, providing, conveying, sending) information generated by other components of the device 905. For example, the transmitter 915 may output information such as user data, control information, or any combination thereof (e.g., I/Q samples, symbols, packets, protocol data units, service data units) associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack). In some examples, the transmitter 915 may support outputting information by transmitting signals via one or more antennas. Additionally, or alternatively, the transmitter 915 may support outputting information by transmitting signals via one or more wired (e.g., electrical, fiber optic) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 915 and the receiver 910 may be co-located in a transceiver, which may include or be coupled with a modem.
The device 905, or various components thereof, may be an example of means for performing various aspects of FDM of the DMRS as described herein. For example, the communications manager 920 may include a control signaling output manager 925, an uplink message reception manager 930, a decoding manager 935, or any combination thereof. The communications manager 920 may be an example of aspects of a communications manager 820 as described herein. In some examples, the communications manager 920, or various components thereof, may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the receiver 910, the transmitter 915, or both. For example, the communications manager 920 may receive information from the receiver 910, send information to the transmitter 915, or be integrated in combination with the receiver 910, the transmitter 915, or both to obtain information, output information, or perform various other operations as described herein.
The communications manager 920 may support wireless communications in accordance with examples as disclosed herein. The control signaling output manager 925 is capable of, configured to, or operable to support a means for outputting control signaling including a configuration for an uplink control message. The uplink message reception manager 930 is capable of, configured to, or operable to support a means for obtaining the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a demodulation reference signal that is frequency division multiplexed with uplink control information, and where the first uplink control message format is associated with a discrete Fourier transform spread orthogonal frequency division multiplexing waveform and a quantity of four or more orthogonal frequency division multiplex symbols. The decoding manager 935 is capable of, configured to, or operable to support a means for decoding the uplink control message based on the configuration.
The communications manager 1020 may support wireless communications in accordance with examples as disclosed herein. The control signaling output manager 1025 is capable of, configured to, or operable to support a means for outputting control signaling including a configuration for an uplink control message. The uplink message reception manager 1030 is capable of, configured to, or operable to support a means for obtaining the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a demodulation reference signal that is frequency division multiplexed with uplink control information, and where the first uplink control message format is associated with a discrete Fourier transform spread orthogonal frequency division multiplexing waveform and a quantity of four or more orthogonal frequency division multiplex symbols. The decoding manager 1035 is capable of, configured to, or operable to support a means for decoding the uplink control message based on the configuration.
In some examples, the downlink message output manager 1040 is capable of, configured to, or operable to support a means for outputting a downlink control message, the downlink control message including a demodulation reference signal frequency division multiplexed with downlink control information, where the downlink control message utilizes a discrete Fourier transform spread orthogonal frequency division multiplexing waveform.
In some examples, the control signaling includes an indication to switch from time division multiplexing to frequency division multiplexing based on the first uplink control message format.
In some examples, the indication to switch includes a dynamic indication, a semi-static indication, or a static indication.
In some examples, the control signaling includes a radio resource control signaling.
In some examples, frequency division multiplexing the demodulation reference signal with the uplink control information is based on a type of demodulation sequence associated with the demodulation reference signal.
In some examples, the type of demodulation sequence is associated with a root index associated with the demodulation reference signal.
In some examples, frequency division multiplexing the demodulation reference signal with the uplink control information is based on a demodulation reference signal density in a frequency domain.
In some examples, frequency division multiplexing the demodulation reference signal with the uplink control information is based on a quantity of demodulation reference signal symbols that are frequency division multiplexed with uplink control information in a slot.
In some examples, a second uplink control message format of the set of multiple uplink control message formats is associated with a cyclic prefix orthogonal frequency division multiplexing waveform and a quantity of two or fewer orthogonal frequency division multiplex symbols.
The transceiver 1110 may support bi-directional communications via wired links, wireless links, or both as described herein. In some examples, the transceiver 1110 may include a wired transceiver and may communicate bi-directionally with another wired transceiver. Additionally, or alternatively, in some examples, the transceiver 1110 may include a wireless transceiver and may communicate bi-directionally with another wireless transceiver. In some examples, the device 1105 may include one or more antennas 1115, which may be capable of transmitting or receiving wireless transmissions (e.g., concurrently). The transceiver 1110 may also include a modem to modulate signals, to provide the modulated signals for transmission (e.g., by one or more antennas 1115, by a wired transmitter), to receive modulated signals (e.g., from one or more antennas 1115, from a wired receiver), and to demodulate signals. In some implementations, the transceiver 1110 may include one or more interfaces, such as one or more interfaces coupled with the one or more antennas 1115 that are configured to support various receiving or obtaining operations, or one or more interfaces coupled with the one or more antennas 1115 that are configured to support various transmitting or outputting operations, or a combination thereof. In some implementations, the transceiver 1110 may include or be configured for coupling with one or more processors or one or more memory components that are operable to perform or support operations based on received or obtained information or signals, or to generate information or other signals for transmission or other outputting, or any combination thereof. In some implementations, the transceiver 1110, or the transceiver 1110 and the one or more antennas 1115, or the transceiver 1110 and the one or more antennas 1115 and one or more processors or one or more memory components (e.g., the at least one processor 1135, the at least one memory 1125, or both), may be included in a chip or chip assembly that is installed in the device 1105. In some examples, the transceiver 1110 may be operable to support communications via one or more communications links (e.g., a communication link 125, a backhaul communication link 120, a midhaul communication link 162, a fronthaul communication link 168).
The at least one memory 1125 may include RAM, ROM, or any combination thereof. The at least one memory 1125 may store computer-readable, computer-executable code 1130 including instructions that, when executed by one or more of the at least one processor 1135, cause the device 1105 to perform various functions described herein. The code 1130 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 1130 may not be directly executable by a processor of the at least one processor 1135 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 1125 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices. In some examples, the at least one processor 1135 may include multiple processors and the at least one memory 1125 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories which may, individually or collectively, be configured to perform various functions herein (for example, as part of a processing system).
The at least one processor 1135 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA, a microcontroller, a programmable logic device, discrete gate or transistor logic, a discrete hardware component, or any combination thereof). In some cases, the at least one processor 1135 may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into one or more of the at least one processor 1135. The at least one processor 1135 may be configured to execute computer-readable instructions stored in a memory (e.g., one or more of the at least one memory 1125) to cause the device 1105 to perform various functions (e.g., functions or tasks supporting FDM of the DMRS). For example, the device 1105 or a component of the device 1105 may include at least one processor 1135 and at least one memory 1125 coupled with one or more of the at least one processor 1135, the at least one processor 1135 and the at least one memory 1125 configured to perform various functions described herein. The at least one processor 1135 may be an example of a cloud-computing platform (e.g., one or more physical nodes and supporting software such as operating systems, virtual machines, or container instances) that may host the functions (e.g., by executing code 1130) to perform the functions of the device 1105. The at least one processor 1135 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in the device 1105 (such as within one or more of the at least one memory 1125). In some examples, the at least one processor 1135 may include multiple processors and the at least one memory 1125 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein. In some examples, the at least one processor 1135 may be a component of a processing system, which may refer to a system (such as a series) of machines, circuitry (including, for example, one or both of processor circuitry (which may include the at least one processor 1135) and memory circuitry (which may include the at least one memory 1125)), or components, that receives or obtains inputs and processes the inputs to produce, generate, or obtain a set of outputs. The processing system may be configured to perform one or more of the functions described herein. As such, the at least one processor 1135 or a processing system including the at least one processor 1135 may be configured to, configurable to, or operable to cause the device 1105 to perform one or more of the functions described herein. Further, as described herein, being “configured to,” being “configurable to,” and being “operable to” may be used interchangeably and may be associated with a capability, when executing code stored in the at least one memory 1125 or otherwise, to perform one or more of the functions described herein.
In some examples, a bus 1140 may support communications of (e.g., within) a protocol layer of a protocol stack. In some examples, a bus 1140 may support communications associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack), which may include communications performed within a component of the device 1105, or between different components of the device 1105 that may be co-located or located in different locations (e.g., where the device 1105 may refer to a system in which one or more of the communications manager 1120, the transceiver 1110, the at least one memory 1125, the code 1130, and the at least one processor 1135 may be located in one of the different components or divided between different components).
In some examples, the communications manager 1120 may manage aspects of communications with a core network 130 (e.g., via one or more wired or wireless backhaul links). For example, the communications manager 1120 may manage the transfer of data communications for client devices, such as one or more UEs 115. In some examples, the communications manager 1120 may manage communications with other network entities 105, and may include a controller or scheduler for controlling communications with UEs 115 in cooperation with other network entities 105. In some examples, the communications manager 1120 may support an X2 interface within an LTE/LTE-A wireless communications network technology to provide communication between network entities 105.
The communications manager 1120 may support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 1120 is capable of, configured to, or operable to support a means for outputting control signaling including a configuration for an uplink control message. The communications manager 1120 is capable of, configured to, or operable to support a means for obtaining the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a demodulation reference signal that is frequency division multiplexed with uplink control information, and where the first uplink control message format is associated with a discrete Fourier transform spread orthogonal frequency division multiplexing waveform and a quantity of four or more orthogonal frequency division multiplex symbols. The communications manager 1120 is capable of, configured to, or operable to support a means for decoding the uplink control message based on the configuration.
By including or configuring the communications manager 1120 in accordance with examples as described herein, the device 1105 may support techniques for reducing overhead in a PUCCH message and increasing quantity of UCI that may be included in the message, while maintaining a PAPR above a PAPR threshold.
In some examples, the communications manager 1120 may be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or otherwise in cooperation with the transceiver 1110, the one or more antennas 1115 (e.g., where applicable), or any combination thereof. Although the communications manager 1120 is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager 1120 may be supported by or performed by the transceiver 1110, one or more of the at least one processor 1135, one or more of the at least one memory 1125, the code 1130, or any combination thereof (for example, by a processing system including at least a portion of the at least one processor 1135, the at least one memory 1125, the code 1130, or any combination thereof). For example, the code 1130 may include instructions executable by one or more of the at least one processor 1135 to cause the device 1105 to perform various aspects of FDM of the DMRS as described herein, or the at least one processor 1135 and the at least one memory 1125 may be otherwise configured to, individually or collectively, perform or support such operations.
At 1205, the method may include receiving control signaling including a configuration for an uplink control message. The operations of block 1205 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1205 may be performed by a control signaling reception manager 625 as described with reference to
At 1210, the method may include generating the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a demodulation reference signal that is frequency division multiplexed with uplink control information, and where the first uplink control message format is associated with a discrete Fourier transform spread orthogonal frequency division multiplexing waveform and a quantity of four or more orthogonal frequency division multiplex symbols. The operations of block 1210 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1210 may be performed by an uplink message generation manager 630 as described with reference to
At 1215, the method may include transmitting the uplink control message using the discrete Fourier transform spread orthogonal frequency division multiplexing waveform. The operations of block 1215 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1215 may be performed by an uplink message transmission manager 635 as described with reference to
At 1305, the method may include receiving control signaling including a configuration for an uplink control message. The operations of block 1305 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1305 may be performed by a control signaling reception manager 625 as described with reference to
At 1310, the method may include generating the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a demodulation reference signal that is frequency division multiplexed with uplink control information, and where the first uplink control message format is associated with a discrete Fourier transform spread orthogonal frequency division multiplexing waveform and a quantity of four or more orthogonal frequency division multiplex symbols. The operations of block 1310 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1310 may be performed by an uplink message generation manager 630 as described with reference to
At 1315, the method may include transmitting the uplink control message using the discrete Fourier transform spread orthogonal frequency division multiplexing waveform. The operations of block 1315 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1315 may be performed by an uplink message transmission manager 635 as described with reference to
At 1320, the method may include generating a sidelink message including a demodulation reference signal frequency division multiplexed with sidelink control information. The operations of block 1320 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1320 may be performed by a sidelink message generation manager 640 as described with reference to
At 1325, the method may include transmitting the sidelink message to a second UE. The operations of block 1325 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1325 may be performed by a sidelink message transmission manager 645 as described with reference to
At 1405, the method may include outputting control signaling including a configuration for an uplink control message. The operations of block 1405 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1405 may be performed by a control signaling output manager 1025 as described with reference to
At 1410, the method may include obtaining the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a demodulation reference signal that is frequency division multiplexed with uplink control information, and where the first uplink control message format is associated with a discrete Fourier transform spread orthogonal frequency division multiplexing waveform and a quantity of four or more orthogonal frequency division multiplex symbols. The operations of block 1410 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1410 may be performed by an uplink message reception manager 1030 as described with reference to
At 1415, the method may include decoding the uplink control message based on the configuration. The operations of block 1415 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1415 may be performed by a decoding manager 1035 as described with reference to
At 1505, the method may include outputting a downlink control message, the downlink control message including a demodulation reference signal frequency division multiplexed with downlink control information, where the downlink control message utilizes a discrete Fourier transform spread orthogonal frequency division multiplexing waveform. The operations of block 1505 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1505 may be performed by downlink message output manager 1040 as described with reference to
At 1510, the method may include outputting control signaling including a configuration for an uplink control message. The operations of block 1510 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1510 may be performed by a control signaling output manager 1025 as described with reference to
At 1515, the method may include obtaining the uplink control message in accordance with the configuration and a first uplink control message format from a set of multiple uplink control message formats, where the uplink control message includes a demodulation reference signal that is frequency division multiplexed with uplink control information, and where the first uplink control message format is associated with a discrete Fourier transform spread orthogonal frequency division multiplexing waveform and a quantity of four or more orthogonal frequency division multiplex symbols. The operations of block 1515 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1515 may be performed by an uplink message reception manager 1030 as described with reference to
At 1520, the method may include decoding the uplink control message based on the configuration. The operations of block 1520 may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1520 may be performed by a decoding manager 1035 as described with reference to
Aspect 1: A method for wireless communications at a UE, comprising: receiving control signaling comprising a configuration for an uplink control message;
generating the uplink control message in accordance with the configuration and a first uplink control message format from a plurality of uplink control message formats, wherein the uplink control message includes a DMRS that is FDM with UCI, and wherein the first uplink control message format is associated with a DFT-s-OFDM waveform and a quantity of four or more OFDM symbols; and transmitting the uplink control message using the DFT-s-OFDM waveform.
Aspect 2: The method of aspect 1, wherein the control signaling includes an indication to switch from TDM to FDM based at least in part on the first uplink control message format.
Aspect 3: The method of aspect 2, wherein the indication to switch includes a dynamic indication, a semi-static indication, or a static indication.
Aspect 4: The method of any of aspects 2 through 3, wherein the control signaling includes a radio resource control signaling.
Aspect 5: The method of any of aspects 1 through 4, wherein FDM the DMRS with the UCI is based at least in part on a type of demodulation sequence associated with the DMRS.
Aspect 6: The method of aspect 5, wherein the type of demodulation sequence is associated with a root index associated with the DMRS.
Aspect 7: The method of any of aspects 1 through 6, wherein FDM the DMRS with the UCI is based at least in part on a DMRS density in a frequency domain.
Aspect 8: The method of any of aspects 1 through 7, wherein FDM the DMRS with the UCI is based at least in part on a quantity of DMRS symbols that are FDM with UCI in a slot.
Aspect 9: The method of any of aspects 1 through 8, further comprising: generating a sidelink message comprising a DMRS FDM multiplexed with sidelink control information; and transmitting the sidelink message to a second UE.
Aspect 10: The method of any of aspects 1 through 9, wherein a second uplink control message format of the plurality of uplink control message formats is associated with a CP-OFDM waveform and a quantity of two or fewer OFDM symbols.
Aspect 11: A method for wireless communications at a network entity, comprising: outputting control signaling comprising a configuration for an uplink control message; obtaining the uplink control message in accordance with the configuration and a first uplink control message format from a plurality of uplink control message formats, wherein the uplink control message includes a DMRS that is FDM with UCI, and wherein the first uplink control message format is associated with a DFT-s-OFDM waveform and a quantity of four or more OFDM symbols; and decoding the uplink control message based at least in part on the configuration.
Aspect 12: The method of aspect 11, further comprising: outputting a downlink control message, the downlink control message comprising a DMRS FDM with downlink control information, wherein the downlink control message utilizes a DFT-s-OFDM waveform.
Aspect 13: The method of any of aspects 11 through 12, wherein the control signaling includes an indication to switch from TDM to FDM based at least in part on the first uplink control message format.
Aspect 14: The method of aspect 13, wherein the indication to switch includes a dynamic indication, a semi-static indication, or a static indication.
Aspect 15: The method of any of aspects 13 through 14, wherein the control signaling includes a radio resource control signaling.
Aspect 16: The method of any of aspects 11 through 15, wherein FDM the DMRS with the UCI is based at least in part on a type of demodulation sequence associated with the DMRS.
Aspect 17: The method of aspect 16, wherein the type of demodulation sequence is associated with a root index associated with the DMRS.
Aspect 18: The method of any of aspects 11 through 17, wherein FDM the DMRS with the UCI is based at least in part on a DMRS density in a frequency domain.
Aspect 19: The method of any of aspects 11 through 18, wherein FDM the DMRS with the UCI is based at least in part on a quantity of DMRS symbols that are FDM with UCI in a slot.
Aspect 20: The method of any of aspects 11 through 19, wherein a second uplink control message format of the plurality of uplink control message formats is associated with a CP-OFDM waveform and a quantity of two or fewer OFDM symbols.
Aspect 21: A UE for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to perform a method of any of aspects 1 through 10.
Aspect 22: A UE for wireless communications, comprising at least one means for performing a method of any of aspects 1 through 10.
Aspect 23: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 1 through 10.
Aspect 24: A network entity for wireless communications, comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the network entity to perform a method of any of aspects 11 through 20.
Aspect 25: A network entity for wireless communications, comprising at least one means for performing a method of any of aspects 11 through 20.
Aspect 26: A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to perform a method of any of aspects 11 through 20.
It should be noted that the methods described herein describe possible implementations, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods may be combined.
Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.
Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed using a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor but, in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration). Any functions or operations described herein as being capable of being performed by a processor may be performed by multiple processors that, individually or collectively, are capable of performing the described functions or operations.
The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as or transmitted using one or more instructions or code of a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc. Disks may reproduce data magnetically, and discs may reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media. Any functions or operations described herein as being capable of being performed by a memory may be performed by multiple memories that, individually or collectively, are capable of performing the described functions or operations.
As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of”) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on.”
As used herein, including in the claims, the article “a” before a noun is open-ended and understood to refer to “at least one” of those nouns or “one or more” of those nouns. Thus, the terms “a,” “at least one,” “one or more,” “at least one of one or more” may be interchangeable. For example, if a claim recites “a component” that performs one or more functions, each of the individual functions may be performed by a single component or by any combination of multiple components. Thus, the term “a component” having characteristics or performing functions may refer to “at least one of one or more components” having a particular characteristic or performing a particular function. Subsequent reference to a component introduced with the article “a” using the terms “the” or “said” may refer to any or all of the one or more components. For example, a component introduced with the article “a” may be understood to mean “one or more components,” and referring to “the component” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components.” Similarly, subsequent reference to a component introduced as “one or more components” using the terms “the” or “said” may refer to any or all of the one or more components. For example, referring to “the one or more components” subsequently in the claims may be understood to be equivalent to referring to “at least one of the one or more components.”
The term “determine” or “determining” encompasses a variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, a database or another data structure), ascertaining and the like. Also, “determining” can include receiving (e.g., receiving information), accessing (e.g., accessing data stored in memory) and the like. Also, “determining” can include resolving, obtaining, selecting, choosing, establishing, and other such similar actions.
In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label, or other subsequent reference label.
The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration,” and not “preferred” or “advantageous over other examples.” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.
The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
