Patent Application
20240243863
The present disclosure relates generally to communication systems, and more particularly, to resource management and coordination for wireless sidelink communications.
Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IOT)), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a first user equipment (UE). The apparatus may identify one or more resources that are suitable for a subsequent transmission from at least one second UE. The apparatus may transmit, to the at least one second UE, an inter-UE coordination message and at least one data transmission. The inter-UE coordination message may be transmitted at a same time as the at least one data transmission. The inter-UE coordination message may include an indication of the one or more resources that are suitable for the subsequent transmission from the at least one second UE.
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a second UE. The apparatus may receive, from a first UE, an inter-UE coordination message and at least one data transmission. The inter-UE coordination message may be received at a same time as the at least one data transmission. The inter-UE coordination message may include an indication of one or more resources that are suitable for a subsequent transmission from the second UE. The apparatus may transmit the subsequent transmission via the one or more resources, or may reselect the one or more resources based on the inter-UE coordination message.
To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.
Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as “elements”). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.
By way of example, an element, or any portion of an element, or any combination of elements may be implemented as a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system may execute software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
Accordingly, in one or more example embodiments, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise a random-access memory (RAM), a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
While aspects and implementations are described in this application by illustration to some examples, those skilled in the art will understand that additional implementations and use cases may come about in many different arrangements and scenarios. Innovations described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, implementations and/or uses may come about via integrated chip implementations and other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, artificial intelligence (AI)-enabled devices, etc.). While some examples may or may not be specifically directed to use cases or applications, a wide assortment of applicability of described innovations may occur. Implementations may range a spectrum from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregate, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more aspects of the described innovations. In some practical settings, devices incorporating described aspects and features may also include additional components and features for implementation and practice of claimed and described aspect. For example, transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes (e.g., hardware components including antenna, RF-chains, power amplifiers, modulators, buffer, processor(s), interleaver, adders/summers, etc.). It is intended that innovations described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc. of varying sizes, shapes, and constitution.
The base stations 102 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC 160 through first backhaul links 132 (e.g., S1 interface). The base stations 102 configured for 5G NR (collectively referred to as Next Generation RAN (NG-RAN)) may interface with core network 190 through second backhaul links 184. In addition to other functions, the base stations 102 may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment trace, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over third backhaul links 134 (e.g., X2 interface). The first backhaul links 132, the second backhaul links 184, and the third backhaul links 134 may be wired or wireless.
The base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102′ may have a coverage area 110′ that overlaps the coverage area 110 of one or more macro base stations 102. A network that includes both small cell and macrocells may be known as a heterogeneous network. A heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs), which may provide service to a restricted group known as a closed subscriber group (CSG). The communication links 120 between the base stations 102 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104. The communication links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity. The communication links may be through one or more carriers. The base stations 102/UEs 104 may use spectrum up to Y MHZ (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) used for transmission in each direction. The carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL). The component carriers may include a primary component carrier and one or more secondary component carriers. A primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell).
Certain UEs 104 may communicate with each other using device-to-device (D2D) communication link 158. The D2D communication link 158 may use the DL/UL WWAN spectrum. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication may be through a variety of wireless D2D communications systems, such as for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.
The wireless communications system may further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154, e.g., in a 5 GHz unlicensed frequency spectrum or the like. When communicating in an unlicensed frequency spectrum, the STAs 152/AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
The small cell 102′ may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102′ may employ NR and use the same unlicensed frequency spectrum (e.g., 5 GHZ, or the like) as used by the Wi-Fi AP 150. The small cell 102′, employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.
The electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHZ-7.125 GHZ) and FR2 (24.25 GHz-52.6 GHz). Although a portion of FR1 is greater than 6 GHZ, FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in various documents and articles. A similar nomenclature issue sometimes occurs with regard to FR2, which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHZ-300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.
The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Recent 5G NR studies have identified an operating band for these mid-band frequencies as frequency range designation FR3 (7.125 GHZ-24.25 GHZ). Frequency bands falling within FR3 may inherit FR1 characteristics and/or FR2 characteristics, and thus may effectively extend features of FR1 and/or FR2 into mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHZ. For example, three higher operating bands have been identified as frequency range designations FR4a or FR4-1 (52.6 GHZ-71 GHz), FR4 (52.6 GHZ-114.25 GHZ), and FR5 (114.25 GHZ-300 GHZ). Each of these higher frequency bands falls within the EHF band.
With the above aspects in mind, unless specifically stated otherwise, it should be understood that the term “sub-6 GHz” or the like if used herein may broadly represent frequencies that may be less than 6 GHZ, may be within FR1, or may include mid-band frequencies. Further, unless specifically stated otherwise, it should be understood that the term “millimeter wave” or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1, and/or FR5, or may be within the EHF band.
A base station 102, whether a small cell 102′ or a large cell (e.g., macro base station), may include and/or be referred to as an eNB, gNodeB (gNB), or another type of base station. Some base stations, such as gNB 180 may operate in a traditional sub 6 GHZ spectrum, in millimeter wave frequencies, and/or near millimeter wave frequencies in communication with the UE 104. When the gNB 180 operates in millimeter wave or near millimeter wave frequencies, the gNB 180 may be referred to as a millimeter wave base station. The millimeter wave base station 180 may utilize beamforming 182 with the UE 104 to compensate for the path loss and short range. The base station 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate the beamforming.
The base station 180 may transmit a beamformed signal to the UE 104 in one or more transmit directions 182′. The UE 104 may receive the beamformed signal from the base station 180 in one or more receive directions 182″. The UE 104 may also transmit a beamformed signal to the base station 180 in one or more transmit directions. The base station 180 may receive the beamformed signal from the UE 104 in one or more receive directions. The base station 180/UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 180/UE 104. The transmit and receive directions for the base station 180 may or may not be the same. The transmit and receive directions for the UE 104 may or may not be the same.
The EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be in communication with a Home Subscriber Server (HSS) 174. The MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160. Generally, the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the Serving Gateway 166, which itself is connected to the PDN Gateway 172. The PDN Gateway 172 provides UE IP address allocation as well as other functions. The PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176. The IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service, and/or other IP services. The BM-SC 170 may provide functions for MBMS user service provisioning and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN), and may be used to schedule MBMS transmissions. The MBMS Gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.
The core network 190 may include an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. The AMF 192 may be in communication with a Unified Data Management (UDM) 196. The AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190. Generally, the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF 195. The UPF 195 provides UE IP address allocation as well as other functions. The UPF 195 is connected to the IP Services 197. The IP Services 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a Packet Switch (PS) Streaming (PSS) Service, and/or other IP services.
The base station may include and/or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmit reception point (TRP), or some other suitable terminology. The base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104. Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device. Some of the UEs 104 may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc.). The UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. In some scenarios, the term UE may also apply to one or more companion devices such as in a device constellation arrangement. One or more of these devices may collectively access the network and/or individually access the network.
Referring again to
For normal CP (14 symbols/slot), different numerologies μ 0 to 4 allow for 1, 2, 4, 8, and 16 slots, respectively, per subframe. For extended CP, the numerology 2 allows for 4 slots per subframe. Accordingly, for normal CP and numerology μ, there are 14 symbols/slot and 24 slots/subframe. The subcarrier spacing may be equal to 2μ*15 kHz, where μ is the numerology 0 to 4. As such, the numerology μ=0 has a subcarrier spacing of 15 kHz and the numerology μ=4 has a subcarrier spacing of 240 kHz. The symbol length/duration is inversely related to the subcarrier spacing.
A resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs)) that extends 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.
As illustrated in
As illustrated in
The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing. The TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing. The channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318 TX. Each transmitter 318 TX may modulate a radio frequency (RF) carrier with a respective spatial stream for transmission.
At the UE 350, each receiver 354 RX receives a signal through its respective antenna 352. Each receiver 354 RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel. The data and control signals are then provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.
The controller/processor 359 can be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller/processor 359 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
Similar to the functionality described in connection with the DL transmission by the base station 310, the controller/processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression/decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.
Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.
The UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350. Each receiver 318RX receives a signal through its respective antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.
The controller/processor 375 can be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer-readable medium. In the UL, the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 350. IP packets from the controller/processor 375 may be provided to the EPC 160. The controller/processor 375 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
At least one of the TX processor 368, the RX processor 356, and the controller/processor 359 may be configured to perform aspects in connection with 198 and 199 of
Herein inter-UE coordination information may also be referred to as resource reservation information. The first UE 402 may forward an indication of resource reservation forwarding to the second UE 404. In particular, the first UE 402 may indicate specific resources to be used for the subsequent sidelink transmission from the second UE 404. In one configuration, the first UE 402 may perform an evaluation, and based on the evaluation, may indicate a set of resources that may be more suitable for the subsequent sidelink transmission from the second UE 404.
In another configuration, the first UE 402 may perform an evaluation, and based on the evaluation, may indicate a set of resources that may not be suitable for the subsequent sidelink transmission from the second UE 404. For example, based on the evaluation performed by the first UE 402, the non-suitable resources may not be available for the subsequent sidelink transmission from the second UE 404.
The first UE 402 may potentially be a receiver of the subsequent sidelink transmission from the second UE 404. In Mode 2, the transmitting UE of the sidelink communication may autonomously select the resources for the transmission from a resource pool. Accordingly, with inter-UE coordination, Mode 2 resource allocation may be based at least in part on resource availability as evaluated from the perspective of a potential receiver of the upcoming sidelink transmission. This may be helpful in addressing the hidden node issue in vehicle-to-everything (V2X) communications.
Inter-UE coordination may be used in conjunction with sidelink transmissions in Mode 2. In one configuration, the coordination information sent from the first UE to the second UE may be the set of suitable and/or non-suitable resources for the subsequent sidelink transmission from the second UE. Additional information other than indicating the time/frequency of the resources within the set may be included in the coordination information.
A two-stage sidelink control information (SCI) may be transmitted between UEs in sidelink communications. The two-stage SCI may include a first stage (referred to as SCI-1) and a second stage (referred to as SCI-2). The SCI-1 may include information regarding resource availability, such as resource reservation and resource allocation information, and information for decoding the SCI-2. The SCI-2 may include at least information for decoding data and information for determining the intended recipient of the transmission.
In another configuration, the coordination information sent from the first UE to the second UE may be an indication of the presence of expected, potential, and/or detected resource conflict on the resources indicated by the SCI transmitted by the second UE.
In some configurations, the first UE sharing the inter-UE coordination information may be (one of) the intended receiver(s) of the subsequent sidelink transmission from the second UE. In some configurations, the first UE sharing the inter-UE coordination information may not be an intended receiver of the subsequent sidelink transmission from the second UE. In other words, the first UE sharing the inter-UE coordination information may be an observer of the subsequent sidelink transmission.
Accordingly, the indication of resource suitability provided by the inter-UE coordination information may improve the reliability in autonomous (Mode 2) sidelink communication. The first UE may indicate to the second UE the suitable and/or non-suitable resources for the subsequent sidelink transmission from the second UE. According to aspects of the disclosure, the first UE may forward the resource reservation information with the sidelink data transmission from the first UE at a same time, and in particular, the first UE may transmit the resource reservation information within sub-channel(s) reserved for the sidelink data transmission, or within sub-channel(s) adjacent to the sub-channel(s) reserved for the sidelink data transmission, e.g., in a piggybacked manner.
In the illustrated example, the first UE may reserve and select a number (e.g., n+1, n being a natural number, where n=2 in the example) of sub-channels within a slot for one data packet (re)transmission. In the n+1 sub-channels, n sub-channels may be used for data transmission or retransmission, and the additional 1 sub-channel adjacent to the n sub-channels in the same slot may be used for the transmission of the inter-UE coordination message. Accordingly, the first UE may transmit the resource reservation information when the first UE has data to transmit via sidelink communication. In other words, the same period and the same packet delay budget (PDB) may be utilized for resource reservation information forwarding and for sidelink data transmission. Accordingly, no extra or separate sensing procedure may be performed for the forwarding of the resource reservation information.
In one configuration, the first UE may reserve n+1 consecutive sub-channels in a single slot for the transmission of the inter-UE coordination message and the data transmission. The data amount of the data transmission may correspond to n sub-channels in the single slot. One of the n+1 consecutive sub-channels may be dedicated to the inter-UE coordination message, and n of the n+1 consecutive sub-channels may be dedicated to the data transmission. The information for decoding the sub-channel dedicated to the inter-UE coordination message may be indicated in an SCI-1 message or an SCI-2 message associated with the data transmission. For example, a one-bit flag may be included in the SCI-1 message to indicate whether the piggybacked sub-channel dedicated to carrying the inter-UE coordination information is enabled. In one configuration, information for decoding the additional sub-channel dedicated to the inter-UE coordination information may be included in the SCI-2 message.
In another configuration, the first UE may reserve n+1 consecutive sub-channels in a single slot for the transmission of the inter-UE coordination message and the data transmission. The data amount of the data transmission may correspond to n sub-channels in the single slot. One of the n+1 consecutive sub-channels may be dedicated to the inter-UE coordination message, and n of the n+1 consecutive sub-channels may be dedicated to the data transmission. Control information associated with the sub-channels dedicated to the data transmission may be included in SCI-1 and SCI-2 messages associated with the data sub-channels. Control information associated with the sub-channel dedicated to the inter-UE coordination message may be included in inter-UE coordination-specific SCI-1 and SCI-2 messages associated with the additional sub-channel dedicated to the inter-UE coordination message. The inter-UE coordination-specific SCI-1 and SCI-2 messages may be carried via a PSCCH and a PSSCH associated with the additional sub-channel dedicated to the inter-UE coordination message, as appropriate.
In yet another configuration, the first UE may reserve n consecutive sub-channels in a single slot for the transmission of the data transmission. The data amount of the data transmission may correspond to the n sub-channels in the single slot. The first UE may transmit the inter-UE coordination message via a single unreserved sub-channel adjacent to the n reserved consecutive sub-channels. The single unreserved sub-channel may be in the same single slot. Because resource collision with transmissions from other UEs may occur, this configuration may be used when the channel busy ratio (CBR) is below a threshold (i.e., when the sidelink channel is not busy, and unreserved and otherwise unused sub-channels between transmissions in a slot are abundant), so that the sidelink bandwidth may be more fully utilized. Control information associated with the sub-channels for the data transmission may be included in SCI-1 and SCI-2 messages associated with the data sub-channels. Control information associated with the additional sub-channel for the inter-UE coordination message may be included in inter-UE coordination-specific SCI-1 and SCI-2 messages associated with the additional sub-channel for the inter-UE coordination message. Because the sub-channel used for the transmission of the inter-UE coordination message may be unreserved, the SCI-1 message may correspond to an absence of resource reservation at the beginning of the sub-channel. The inter-UE coordination-specific SCI-1 and SCI-2 messages may be carried via a PSCCH and a PSSCH associated with the additional sub-channel for the inter-UE coordination message, as appropriate.
Because the resource reservation information may change over transmissions, a re-transmission of the inter-UE coordination message, in case of a transmission failure, may not be performed. A further transmission of an inter-UE coordination message may be based on the then updated or latest information available to the first UE (e.g., extracted reservation information obtained from decoding the SCI from other UEs and information included in inter-UE coordination messages from other UEs). Although the resource reservation information may be transmitted at a same time as the sidelink data transmission (the data transmission may include TB initial transmission and re-transmission(s)), the resource reservation information may be separately encoded from the data transmission. The SCI-2 message may include decoding information (e.g., the modulation and coding scheme “MCS”, the HARQ information, the redundancy version “RV”, etc.) so that the receiver may successfully decode the packet. In some aspects, because the inter-UE coordination message may not be retransmitted even when the decoding is not successful, the SCI-2 message may not indicate a HARQ process or a new data indicator (NDI) for the transmission of the resource reservation information. Accordingly, the data transmission may be retransmitted, as needed, without causing the inter-UE coordination message to also be retransmitted.
In some configurations, at 610a, the first UE 602 may reserve n+1 consecutive sub-channels in a single slot for the transmission of an inter-UE coordination message and at least one data transmission. A data amount of the at least one data transmission may correspond to n sub-channels in the single slot. One of the n+1 consecutive sub-channels may be dedicated to the inter-UE coordination message, and n of the n+1 consecutive sub-channels may be dedicated to the at least one data transmission. In one configuration, at least one of an SCI-1 message or an SCI-2 message associated with the n sub-channels dedicated to the at least one data transmission may include information for decoding the sub-channel dedicated to the inter-UE coordination message. In one configuration, at least one of an inter-UE coordination-specific SCI-1 message or an inter-UE coordination-specific SCI-2 message may include control information associated with the sub-channel dedicated to the inter-UE coordination message.
In some configurations, at 610b, the first UE 602 may reserve n consecutive sub-channels in a single slot for the transmission of at least one data transmission. A data amount of the at least one data transmission corresponding to the n sub-channels in the single slot. An inter-UE coordination message may be transmitted via a single unreserved sub-channel adjacent to the n reserved consecutive sub-channels. The single unreserved sub-channel may be in the single slot.
At 612, the first UE 602 may transmit to the second UE 604, and the second UE 604 may receive from the first UE 602, an inter-UE coordination message and the at least one data transmission. The inter-UE coordination message may be transmitted at a same time as the at least one data transmission. The inter-UE coordination message may include an indication of the one or more resources that are suitable for the subsequent transmission from the at least one second UE. At 614, the second UE 604 may transmit the subsequent transmission via the one or more resources, or may reselect the one or more resources based on the inter-UE coordination message.
In one configuration, the one or more resources may correspond to at least one of one or more sub-channels or one or more slots. In one configuration, the inter-UE coordination message may be piggybacked with the at least one data transmission. In one configuration, the inter-UE coordination message may be associated with at least one of an SCI-1 message or an SCI-2 message. In one configuration, the inter-UE coordination message may further include at least one of an indication of one or more resources that are not suitable for the subsequent transmission from the at least one second UE, or an indication of a collision. In one configuration, the at least one data transmission may correspond to at least one of application data or TB data.
At 704, the first UE may transmit, to the at least one second UE, an inter-UE coordination message and at least one data transmission. The inter-UE coordination message may be transmitted at a same time as the at least one data transmission. The inter-UE coordination message may include an indication of the one or more resources that are suitable for the subsequent transmission from the at least one second UE. For example, 704 may be performed by the sidelink component 1040 in
At 808, the first UE may transmit, to the at least one second UE, an inter-UE coordination message and at least one data transmission. The inter-UE coordination message may be transmitted at a same time as the at least one data transmission. The inter-UE coordination message may include an indication of the one or more resources that are suitable for the subsequent transmission from the at least one second UE. For example, 808 may be performed by the sidelink component 1040 in
In one configuration, the one or more resources may correspond to at least one of one or more sub-channels or one or more slots.
In one configuration, the inter-UE coordination message may be piggybacked with the at least one data transmission.
In one configuration, the inter-UE coordination message may be associated with at least one of an SCI-1 message or an SCI-2 message.
In one configuration, the inter-UE coordination message may further include at least one of an indication of one or more resources that are not suitable for the subsequent transmission from the at least one second UE, or an indication of a collision.
In one configuration, the at least one data transmission may correspond to at least one of application data or TB data.
In one configuration, at 806a, the first UE may reserve n+1 consecutive sub-channels in a single slot for the transmission of the inter-UE coordination message and the at least one data transmission. A data amount of the at least one data transmission may correspond to n sub-channels in the single slot. One of the n+1 consecutive sub-channels may be dedicated to the inter-UE coordination message, and n of the n+1 consecutive sub-channels may be dedicated to the at least one data transmission. For example, 806a may be performed by the sidelink component 1040 in
In one configuration, at least one of an SCI-1 message or an SCI-2 message associated with the n sub-channels dedicated to the at least one data transmission may include information for decoding the sub-channel dedicated to the inter-UE coordination message.
In one configuration, at least one of an inter-UE coordination-specific SCI-1 message or an inter-UE coordination-specific SCI-2 message may include control information associated with the sub-channel dedicated to the inter-UE coordination message.
In one configuration, at 806b, the first UE may reserve n consecutive sub-channels in a single slot for the transmission of the at least one data transmission. A data amount of the at least one data transmission may correspond to the n sub-channels in the single slot. The inter-UE coordination message may be transmitted via a single unreserved sub-channel adjacent to the n reserved consecutive sub-channels. The single unreserved sub-channel may be in the single slot. For example, 806b may be performed by the sidelink component 1040 in
In one configuration, at 810, the first UE may receive, from the at least one second UE, the subsequent transmission via the one or more resources. For example, 810 may be performed by the sidelink component 1040 in
In one configuration, in response to identify the one or more resources that are suitable for the subsequent transmission from the at least one second UE, at 804, the first UE may reserve the one or more resources that are suitable for the subsequent transmission from the at least one second UE. For example, 804 may be performed by the sidelink component 1040 in
At 904, the second UE may transmit the subsequent transmission via the one or more resources, or may reselect the one or more resources based on the inter-UE coordination message. For example, 904 may be performed by the sidelink component 1140 in
In one configuration, the one or more resources may correspond to at least one of one or more sub-channels or one or more slots.
In one configuration, the inter-UE coordination message may be piggybacked with the at least one data transmission.
In one configuration, the inter-UE coordination message may be associated with at least one of an SCI-1 message or an SCI-2 message.
In one configuration, the inter-UE coordination message may further include at least one of an indication of one or more resources that are not suitable for the subsequent transmission from the at least one second UE, or an indication of a collision.
In one configuration, the at least one data transmission may correspond to at least one of application data or TB data.
In one configuration, the inter-UE coordination message may be a broadcast message.
In one configuration, the inter-UE coordination message and the at least one data transmission may be received via reserved n+1 consecutive sub-channels in a single slot. A data amount of the at least one data transmission may correspond to n sub-channels in the single slot. One of the n+1 consecutive sub-channels may be dedicated to the inter-UE coordination message, and n of the n+1 consecutive sub-channels may be dedicated to the at least one data transmission.
In one configuration, at least one of an SCI-1 message or an SCI-2 message associated with the n sub-channels dedicated to the at least one data transmission may include information for decoding the sub-channel dedicated to the inter-UE coordination message.
In one configuration, at least one of an inter-UE coordination-specific SCI-1 message or an inter-UE coordination-specific SCI-2 message may include control information associated with the sub-channel dedicated to the inter-UE coordination message.
In one configuration, the at least one data transmission may be received via reserved n consecutive sub-channels in a single slot. A data amount of the at least one data transmission may correspond to the n sub-channels in the single slot. The inter-UE coordination message may be received via a single unreserved sub-channel adjacent to the n reserved consecutive sub-channels. The single unreserved sub-channel may be in the single slot.
In one configuration, the subsequent transmission may be transmitted to the first UE or at least one other UE.
The communication manager 1032 may include a sidelink component 1040 that may be configured to identify one or more resources that are suitable for a subsequent transmission from at least one second UE, e.g., as described in connection with 702 in
The apparatus may include additional components that perform each of the blocks of the algorithm in the flowcharts of
As shown, the apparatus 1002 may include a variety of components configured for various functions. In one configuration, the apparatus 1002, and in particular the cellular baseband processor 1004, includes means for identifying one or more resources that are suitable for a subsequent transmission from at least one second UE. The apparatus 1002 may include means for transmitting, to the at least one second UE, an inter-UE coordination message and at least one data transmission. The inter-UE coordination message may be transmitted at a same time as the at least one data transmission. The inter-UE coordination message may include an indication of the one or more resources that are suitable for the subsequent transmission from the at least one second UE.
In one configuration, the one or more resources may correspond to at least one of one or more sub-channels or one or more slots. In one configuration, the inter-UE coordination message may be piggybacked with the at least one data transmission. In one configuration, the inter-UE coordination message may be associated with at least one of an SCI-1 message or an SCI-2 message. In one configuration, the inter-UE coordination message may further include at least one of an indication of one or more resources that are not suitable for the subsequent transmission from the at least one second UE, or an indication of a collision. In one configuration, the at least one data transmission may correspond to at least one of application data or TB data. In one configuration, the apparatus 1002 may include means for reserving n+1 consecutive sub-channels in a single slot for the transmission of the inter-UE coordination message and the at least one data transmission. A data amount of the at least one data transmission may correspond to n sub-channels in the single slot. One of the n+1 consecutive sub-channels may be dedicated to the inter-UE coordination message, and n of the n+1 consecutive sub-channels may be dedicated to the at least one data transmission. In one configuration, at least one of an SCI-1 message or an SCI-2 message associated with the n sub-channels dedicated to the at least one data transmission may include information for decoding the sub-channel dedicated to the inter-UE coordination message. In one configuration, at least one of an inter-UE coordination-specific SCI-1 message or an inter-UE coordination-specific SCI-2 message may include control information associated with the sub-channel dedicated to the inter-UE coordination message. In one configuration, the apparatus 1002 may include means for reserving n consecutive sub-channels in a single slot for the transmission of the at least one data transmission. A data amount of the at least one data transmission may correspond to the n sub-channels in the single slot. The inter-UE coordination message may be transmitted via a single unreserved sub-channel adjacent to the n reserved consecutive sub-channels. The single unreserved sub-channel may be in the single slot. In one configuration, the apparatus 1002 may include means for receiving, from the at least one second UE, the subsequent transmission via the one or more resources. In one configuration, in response to identify the one or more resources that are suitable for the subsequent transmission from the at least one second UE, the apparatus 1002 may include means for reserving the one or more resources that are suitable for the subsequent transmission from the at least one second UE.
The means may be one or more of the components of the apparatus 1002 configured to perform the functions recited by the means. As described supra, the apparatus 1002 may include the TX Processor 368, the RX Processor 356, and the controller/processor 359. As such, in one configuration, the means may be the TX Processor 368, the RX Processor 356, and the controller/processor 359 configured to perform the functions recited by the means.
The communication manager 1132 includes a sidelink component 1140 that may be configured to receive, from a first UE, an inter-UE coordination message and at least one data transmission, e.g., as described in connection with 902 in
The apparatus may include additional components that perform each of the blocks of the algorithm in the flowcharts of
As shown, the apparatus 1102 may include a variety of components configured for various functions. In one configuration, the apparatus 1102, and in particular the cellular baseband processor 1104, includes means for receiving, from a first UE, an inter-UE coordination message and at least one data transmission. The inter-UE coordination message may be received at a same time as the at least one data transmission. The inter-UE coordination message may include an indication of one or more resources that are suitable for a subsequent transmission from the second UE. The apparatus 1102 may include means for transmitting the subsequent transmission via the one or more resources, or may include means for reselecting the one or more resources based on the inter-UE coordination message.
In one configuration, the one or more resources may correspond to at least one of one or more sub-channels or one or more slots. In one configuration, the inter-UE coordination message may be piggybacked with the at least one data transmission. In one configuration, the inter-UE coordination message may be associated with at least one of an SCI-1 message or an SCI-2 message. In one configuration, the inter-UE coordination message may further include at least one of an indication of one or more resources that are not suitable for the subsequent transmission from the at least one second UE, or an indication of a collision. In one configuration, the at least one data transmission may correspond to at least one of application data or TB data. In one configuration, the inter-UE coordination message may be a broadcast message. In one configuration, the inter-UE coordination message and the at least one data transmission may be received via reserved n+1 consecutive sub-channels in a single slot. A data amount of the at least one data transmission may correspond to n sub-channels in the single slot. One of the n+1 consecutive sub-channels may be dedicated to the inter-UE coordination message, and n of the n+1 consecutive sub-channels may be dedicated to the at least one data transmission. In one configuration, at least one of an SCI-1 message or an SCI-2 message associated with the n sub-channels dedicated to the at least one data transmission may include information for decoding the sub-channel dedicated to the inter-UE coordination message. In one configuration, at least one of an inter-UE coordination-specific SCI-1 message or an inter-UE coordination-specific SCI-2 message may include control information associated with the sub-channel dedicated to the inter-UE coordination message. In one configuration, the at least one data transmission may be received via reserved n consecutive sub-channels in a single slot. A data amount of the at least one data transmission may correspond to the n sub-channels in the single slot. The inter-UE coordination message may be received via a single unreserved sub-channel adjacent to the n reserved consecutive sub-channels. The single unreserved sub-channel may be in the single slot. In one configuration, the subsequent transmission may be transmitted to the first UE or at least one other UE.
The means may be one or more of the components of the apparatus 1102 configured to perform the functions recited by the means. As described supra, the apparatus 1102 may include the TX Processor 368, the RX Processor 356, and the controller/processor 359. As such, in one configuration, the means may be the TX Processor 368, the RX Processor 356, and the controller/processor 359 configured to perform the functions recited by the means.
Therefore, according to the aspects described herein, the first UE may identify one or more resources that are suitable for a subsequent transmission from at least one second UE. The first UE may transmit to the at least one second UE, an inter-UE coordination message and at least one data transmission. The inter-UE coordination message may be transmitted at a same time as the at least one data transmission. The inter-UE coordination message may include an indication of the one or more resources that are suitable for the subsequent transmission from the at least one second UE. In one configuration, the inter-UE coordination message may be piggybacked with the at least one data transmission. The at least one second UE may transmit the subsequent transmission via the one or more resources, or may reselect the one or more resources based on the inter-UE coordination message. By transmitting the inter-UE coordination message at a same time as the at least one data transmission, the first UE may obviate a need for a separate sensing occasion for the transmission of the inter-UE coordination message.
It is understood that the specific order or hierarchy of blocks in the processes/flowcharts disclosed is an illustration of example approaches. Based upon design preferences, it is understood that the specific order or hierarchy of blocks in the processes/flowcharts may be rearranged. Further, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not meant to be limited to the specific order or hierarchy presented.
The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more.” Terms such as “if,” “when,” and “while” should be interpreted to mean “under the condition that” rather than imply an immediate temporal relationship or reaction. That is, these phrases, e.g., “when,” do not imply an immediate action in response to or during the occurrence of an action, but simply imply that if a condition is met then an action will occur, but without requiring a specific or immediate time constraint for the action to occur. The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B. A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words “module,” “mechanism,” “element,” “device,” and the like may not be a substitute for the word “means.” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for.”
The following aspects are illustrative only and may be combined with other aspects or teachings described herein, without limitation.
Aspect 1 is an apparatus for wireless communication at a first UE including at least one processor coupled to a memory and configured to identify one or more resources that are suitable for a subsequent transmission from at least one second UE; and transmit, to the at least one second UE, an inter-UE coordination message and at least one data transmission, the inter-UE coordination message being transmitted at a same time as the at least one data transmission, the inter-UE coordination message including an indication of the one or more resources that are suitable for the subsequent transmission from the at least one second UE.
Aspect 2 is the apparatus of aspect 1, where the one or more resources correspond to at least one of one or more sub-channels or one or more slots.
Aspect 3 is the apparatus of any of aspects 1 and 2, where the inter-UE coordination message is piggybacked with the at least one data transmission.
Aspect 4 is the apparatus of any of aspects 1 to 3, where the inter-UE coordination message is associated with at least one of an SCI-1 message or an SCI-2 message.
Aspect 5 is the apparatus of any of aspects 1 to 4, where the inter-UE coordination message further includes at least one of an indication of one or more resources that are not suitable for the subsequent transmission from the at least one second UE, or an indication of a collision.
Aspect 6 is the apparatus of any of aspects 1 to 5, where the at least one data transmission corresponds to at least one of application data or TB data.
Aspect 7 is the apparatus of any of aspects 1 to 6, where the inter-UE coordination message is a broadcast message.
Aspect 8 is the apparatus of any of aspects 1 to 7, the at least one processor being further configured to: reserve n+1 consecutive sub-channels in a single slot for the transmission of the inter-UE coordination message and the at least one data transmission, a data amount of the at least one data transmission corresponding to n sub-channels in the single slot, where one of the n+1 consecutive sub-channels is dedicated to the inter-UE coordination message, and n of the n+1 consecutive sub-channels are dedicated to the at least one data transmission.
Aspect 9 is the apparatus of aspect 8, where at least one of an SCI-1 message or an SCI-2 message associated with the n sub-channels dedicated to the at least one data transmission includes information for decoding the sub-channel dedicated to the inter-UE coordination message.
Aspect 10 is the apparatus of aspect 8, where at least one of an inter-UE coordination-specific SCI-1 message or an inter-UE coordination-specific SCI-2 message includes control information associated with the sub-channel dedicated to the inter-UE coordination message.
Aspect 11 is the apparatus of any of aspects 1 to 7, the at least one processor being further configured to: reserve n consecutive sub-channels in a single slot for the transmission of the at least one data transmission, a data amount of the at least one data transmission corresponding to the n sub-channels in the single slot, where the inter-UE coordination message is transmitted via a single unreserved sub-channel adjacent to the n reserved consecutive sub-channels, the single unreserved sub-channel being in the single slot.
Aspect 12 is the apparatus of any of aspects 1 to 11, the at least one processor being further configured to: receive, from the at least one second UE, the subsequent transmission via the one or more resources.
Aspect 13 is the apparatus of any of aspects 1 to 12, where in response to identify the one or more resources that are suitable for the subsequent transmission from the at least one second UE, the at least one processor is further configured to: reserve the one or more resources that are suitable for the subsequent transmission from the at least one second UE.
Aspect 14 is the apparatus of any of aspects 1 to 13, further including a transceiver coupled to the at least one processor.
Aspect 15 is an apparatus for wireless communication at a second UE including at least one processor coupled to a memory and configured to receive, from a first UE, an inter-UE coordination message and at least one data transmission, the inter-UE coordination message being received at a same time as the at least one data transmission, the inter-UE coordination message including an indication of one or more resources that are suitable for a subsequent transmission from the second UE; and transmit the subsequent transmission via the one or more resources, or reselect the one or more resources based on the inter-UE coordination message.
Aspect 16 is the apparatus of aspect 15, where the one or more resources correspond to at least one of one or more sub-channels or one or more slots.
Aspect 17 is the apparatus of any of aspects 15 and 16, where the inter-UE coordination message is piggybacked with the at least one data transmission.
Aspect 18 is the apparatus of any of aspects 15 to 17, where the inter-UE coordination message is associated with at least one of an SCI-1 message or an SCI-2 message.
Aspect 19 is the apparatus of any of aspects 15 to 18, where the inter-UE coordination message further includes at least one of an indication of one or more resources that are not suitable for the subsequent transmission from the at least one second UE, or an indication of a collision.
Aspect 20 is the apparatus of any of aspects 15 to 19, where the at least one data transmission corresponds to at least one of application data or TB data.
Aspect 21 is the apparatus of any of aspects 15 to 20, where the inter-UE coordination message is a broadcast message.
Aspect 22 is the apparatus of any of aspects 15 to 21, where the inter-UE coordination message and the at least one data transmission are received via reserved n+1 consecutive sub-channels in a single slot, a data amount of the at least one data transmission corresponding to n sub-channels in the single slot, one of the n+1 consecutive sub-channels is dedicated to the inter-UE coordination message, and n of the n+1 consecutive sub-channels are dedicated to the at least one data transmission.
Aspect 23 is the apparatus of aspect 22, where at least one of an SCI-1 message or an SCI-2 message associated with the n sub-channels dedicated to the at least one data transmission includes information for decoding the sub-channel dedicated to the inter-UE coordination message.
Aspect 24 is the apparatus of aspect 22, where at least one of an inter-UE coordination-specific SCI-1 message or an inter-UE coordination-specific SCI-2 message includes control information associated with the sub-channel dedicated to the inter-UE coordination message.
Aspect 25 is the apparatus of any of aspects 15 to 21, where the at least one data transmission is received via reserved n consecutive sub-channels in a single slot, a data amount of the at least one data transmission corresponding to the n sub-channels in the single slot, and the inter-UE coordination message is received via a single unreserved sub-channel adjacent to the n reserved consecutive sub-channels, the single unreserved sub-channel being in the single slot.
Aspect 26 is the apparatus of any of aspects 15 to 25, where the subsequent transmission is transmitted to the first UE or at least one other UE.
Aspect 27 is the apparatus of any of aspects 15 to 26, further including a transceiver coupled to the at least one processor.
Aspect 28 is a method of wireless communication for implementing any of aspects 1 to 27.
Aspect 29 is an apparatus for wireless communication including means for implementing any of aspects 1 to 27.
Aspect 30 is a computer-readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 1 to 27.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2021/106676 | 7/16/2021 | WO |
