Patent Application
20230110952
The disclosure relates generally to wireless communications, including but not limited to systems and methods for performing beam-switching for user equipment in inactive state using configuration grants.
The standardization organization Third Generation Partnership Project (3GPP) is currently in the process of specifying a new Radio Interface called 5G New Radio (5G NR) as well as a Next Generation Packet Core Network (NG-CN or NGC). The 5G NR will have three main components: a 5G Access Network (5G-AN), a 5G Core Network (5GC), and a User Equipment (UE). In order to facilitate the enablement of different data services and requirements, the elements of the 5GC, also called Network Functions, have been simplified with some of them being software based so that they could be adapted according to need.
The example embodiments disclosed herein are directed to solving the issues relating to one or more of the problems presented in the prior art, as well as providing additional features that will become readily apparent by reference to the following detailed description when taken in conjunction with the accompany drawings. In accordance with various embodiments, example systems, methods, devices and computer program products are disclosed herein. It is understood, however, that these embodiments are presented by way of example and are not limiting, and it will be apparent to those of ordinary skill in the art who read the present disclosure that various modifications to the disclosed embodiments can be made while remaining within the scope of this disclosure.
At least one aspect is directed to a system, method, apparatus, or a computer-readable medium. A wireless communication node may send a beam switching configuration for a configured grant to a wireless communication device. The wireless communication node may determine a threshold for beam switching. The wireless communication node may detect, when the wireless communication device is in a radio resource control (RRC) inactive state, that a quality of a beam received via the configured grant is below the threshold.
In some embodiments, the beam switching configuration comprises at least one of: an indication to support beam switching for each of a plurality of configured grants or for the plurality of configured grants at the wireless communication device; an indication to maintain each of the plurality of configured grants or the plurality of configured grants at the wireless communication device when the wireless communication device is in the RRC inactive state; or the threshold for the beam switching for each of the plurality of configured grants or for the plurality of configured grants at the wireless communication device.
In some embodiments, the wireless communication node may send the beam switching configuration to the wireless communication device via at least a RRC message or an information element (IE) for a configured grant configuration in a RRC message. In some embodiments, the wireless communication node may send, responsive to the quality of the beam being below the threshold, a request to the wireless communication device to perform beam switching. In some embodiments, the request to perform beam switching may include an indication that the quality of the beam is below the threshold.
In some embodiments, the wireless communication node may receive, from the wireless communication device, at least one of: an indication of an synchronization signal block (SSB) having best quality amongst a plurality of SSBs, or time information for the wireless communication device to perform the beam switching. In some embodiments, the wireless communication node may send, to the wireless communication device, a confirmation in response to the received indication of the SSB having the best quality. In some embodiments, the wireless communication node may receive uplink data via the configured grant using a new receiving beam corresponding to the received indication of the SSB having the best quality.
In some embodiments, the wireless communication node may send, responsive to the quality of the new beam satisfying the threshold, an indication to keep the new beam. In some embodiments, the indication to keep the new beam may include an indication that the quality of the new beam satisfies the threshold. In some embodiments, the wireless communication node may receive, from the wireless communication device, a confirmation in response to the indication to keep the new beam.
In some embodiments, the beam switching configuration comprises at least one of: an indication to support beam switching for each of a plurality of configured grants or for the plurality of configured grants at the wireless communication device; a configuration for sounding reference signal (SRS), containing at least information on one or more sets of SRS resources, for each of the plurality of configured grants or for the plurality of configured grants at the wireless communication device; an indication to maintain each of the plurality of configured grants, or the plurality of configured grants at the wireless communication device, when the wireless communication device is in the RRC inactive state; or a threshold for the beam switching for each of the plurality of configured grants or for the plurality of configured grants at the wireless communication device.
In some embodiments, the wireless communication node may send, to the wireless communication device, a request for activation of a plurality of SRS resources at the wireless communication device that is in inactive state. In some embodiments, the wireless communication node may send, to the wireless communication device, the request in response to the quality of the beam received via the configured grant being below the threshold.
In some embodiments, the wireless communication node may receive, from the wireless communication device, the plurality of SRSes. In some embodiments, the wireless communication node may send, to the wireless communication device when the wireless communication device is in the RRC inactive state, an indication of a SRS having best quality amongst the plurality of SRSes. In some embodiments, the wireless communication node may receive from the wireless communication device, a confirmation for the indication of the SRS having the best quality.
In some embodiments, the wireless communication node may send, to the wireless communication device, a message to deactivate SRS at the wireless communication device which is in inactive state. In some embodiments, the wireless communication node may send, to the wireless communication device, the message to deactivate SRS, in response to a quality of a new beam received via the configured grant being higher than the threshold.
At least one aspect is directed to a system, method, apparatus, or a computer-readable medium. A wireless communication device may receive, from a wireless communication node, a beam switching configuration for a configured grant. The wireless communication device may perform, when in a radio resource control (RRC) inactive state, beam switching via the configured grant.
In some embodiments, the beam switching configuration comprises at least one of: an indication to support beam switching for each of a plurality of configured grants or for the plurality of configured grants at the wireless communication device; an indication to maintain each of the plurality of configured grants or the plurality of configured grants at the wireless communication device when the wireless communication device is in the RRC inactive state; or a threshold for beam switching for each of the plurality of configured grants or for the plurality of configured grants at the wireless communication device.
In some embodiments, the wireless communication device may receive the beam switching configuration from the wireless communication device via at least a RRC message or an information element (IE) for a configured grant configuration in a RRC message. In some embodiments, the wireless communication device may receive, from the wireless communication device responsive to the quality of the beam being below a threshold of the wireless communication node for beam switching, a request to perform beam switching. In some embodiments, the request to perform beam switching may include an indication that the quality of the beam is below the threshold.
In some embodiments, the wireless communication device may send, to the wireless communication node prior to performing the beam switching, at least one of: an indication of an synchronization signal block (SSB) having best quality amongst a plurality of SSBs, or time information for the wireless communication device to perform the beam switching. In some embodiments, the wireless communication device may receive, from the wireless communication node, a confirmation in response to the indication of the SSB having the best quality. In some embodiments, the wireless communication device may send, using a new transmission beam corresponding to the indication of the SSB having the best quality, uplink data via the configured grant to the wireless communication node.
In some embodiments, the wireless communication device responsive to the quality of the new beam satisfying a threshold of the wireless communication node for beam switching, an indication to keep the new beam. In some embodiments, the indication to keep the new beam may include an indication that the quality of the new beam satisfies the threshold. In some embodiments, the wireless communication device may send, to the wireless communication node, a confirmation in response to the indication to keep the new beam.
In some embodiments, the beam switching configuration may include at least one of: an indication to support beam switching for each of a plurality of configured grants or for the plurality of configured grants at the wireless communication device; a configuration for sounding reference signal (SRS), containing at least information on one or more sets of SRS resources, for each of the plurality of configured grants or for the plurality of configured grants at the wireless communication device; an indication to maintain each of the plurality of configured grants, or the plurality of configured grants at the wireless communication device, when the wireless communication device is in the RRC inactive state; or a threshold for the beam switching for each of the plurality of configured grants or for the plurality of configured grants at the wireless communication device.
In some embodiments, the wireless communication device that is in inactive state may receive, from the wireless communication device, a request for activation of a plurality of SRS resources at the wireless communication device. In some embodiments, the wireless communication device may receive, from the wireless communication device, the request in response to the quality of the beam sent via the configured grant being below the threshold.
In some embodiments, the wireless communication device may send, to the wireless communication node, the plurality of SRSes. In some embodiments, the wireless communication device may receive, from the wireless communication node when the wireless communication device is in the RRC inactive state, an indication of a SRS having best quality amongst the plurality of SRSes. In some embodiments, the wireless communication device may send, to the wireless communication node, a confirmation for the indication of the SRS having the best quality.
In some embodiments, the wireless communication device may receive, from the wireless communication node, a message to deactivate SRS at the wireless communication device which is in inactive state. In some embodiments, the wireless communication device may receive, from the wireless communication node, the message to deactivate SRS, in response to a quality of a new beam sent via the configured grant being higher than the threshold. In some embodiments, the wireless communication device may send, to the wireless communication node, a confirmation in response to the message to deactivate SRS.
Various example embodiments of the present solution are described in detail below with reference to the following figures or drawings. The drawings are provided for purposes of illustration only and merely depict example embodiments of the present solution to facilitate the reader's understanding of the present solution. Therefore, the drawings should not be considered limiting of the breadth, scope, or applicability of the present solution. It should be noted that for clarity and ease of illustration, these drawings are not necessarily drawn to scale.
Various example embodiments of the present solution are described below with reference to the accompanying figures to enable a person of ordinary skill in the art to make and use the present solution. As would be apparent to those of ordinary skill in the art, after reading the present disclosure, various changes or modifications to the examples described herein can be made without departing from the scope of the present solution. Thus, the present solution is not limited to the example embodiments and applications described and illustrated herein. Additionally, the specific order or hierarchy of steps in the methods disclosed herein are merely example approaches. Based upon design preferences, the specific order or hierarchy of steps of the disclosed methods or processes can be re-arranged while remaining within the scope of the present solution. Thus, those of ordinary skill in the art will understand that the methods and techniques disclosed herein present various steps or acts in a sample order, and the present solution is not limited to the specific order or hierarchy presented unless expressly stated otherwise.
The following acronyms are used throughout the present disclosure:
For example, the BS 102 may operate at an allocated channel transmission bandwidth to provide adequate coverage to the UE 104. The BS 102 and the UE 104 may communicate via a downlink radio frame 118, and an uplink radio frame 124 respectively. Each radio frame 118/124 may be further divided into sub-frames 120/127 which may include data symbols 122/128. In the present disclosure, the BS 102 and UE 104 are described herein as non-limiting examples of “communication nodes,” generally, which can practice the methods disclosed herein. Such communication nodes may be capable of wireless and/or wired communications, in accordance with various embodiments of the present solution.
System 200 generally includes a base station 202 (hereinafter “BS 202”) and a user equipment device 204 (hereinafter “UE 204”). The BS 202 includes a BS (base station) transceiver module 210, a BS antenna 212, a BS processor module 214, a BS memory module 216, and a network communication module 218, each module being coupled and interconnected with one another as necessary via a data communication bus 220. The UE 204 includes a UE (user equipment) transceiver module 230, a UE antenna 232, a UE memory module 234, and a UE processor module 236, each module being coupled and interconnected with one another as necessary via a data communication bus 240. The BS 202 communicates with the UE 204 via a communication channel 250, which can be any wireless channel or other medium suitable for transmission of data as described herein.
As would be understood by persons of ordinary skill in the art, system 200 may further include any number of modules other than the modules shown in
In accordance with some embodiments, the UE transceiver 230 may be referred to herein as an “uplink” transceiver 230 that includes a radio frequency (RF) transmitter and a RF receiver each comprising circuitry that is coupled to the antenna 232. A duplex switch (not shown) may alternatively couple the uplink transmitter or receiver to the uplink antenna in time duplex fashion. Similarly, in accordance with some embodiments, the BS transceiver 210 may be referred to herein as a “downlink” transceiver 210 that includes a RF transmitter and a RF receiver each comprising circuitry that is coupled to the antenna 212. A downlink duplex switch may alternatively couple the downlink transmitter or receiver to the downlink antenna 212 in time duplex fashion. The operations of the two transceiver modules 210 and 230 may be coordinated in time such that the uplink receiver circuitry is coupled to the uplink antenna 232 for reception of transmissions over the wireless transmission link 250 at the same time that the downlink transmitter is coupled to the downlink antenna 212. Conversely, the operations of the two transceivers 210 and 230 may be coordinated in time such that the downlink receiver is coupled to the downlink antenna 212 for reception of transmissions over the wireless transmission link 250 at the same time that the uplink transmitter is coupled to the uplink antenna 232. In some embodiments, there is close time synchronization with a minimal guard time between changes in duplex direction.
The UE transceiver 230 and the base station transceiver 210 are configured to communicate via the wireless data communication link 250, and cooperate with a suitably configured RF antenna arrangement 212/232 that can support a particular wireless communication protocol and modulation scheme. In some illustrative embodiments, the UE transceiver 210 and the base station transceiver 210 are configured to support industry standards such as the Long Term Evolution (LTE) and emerging 5G standards, and the like. It is understood, however, that the present disclosure is not necessarily limited in application to a particular standard and associated protocols. Rather, the UE transceiver 230 and the base station transceiver 210 may be configured to support alternate, or additional, wireless data communication protocols, including future standards or variations thereof.
In accordance with various embodiments, the BS 202 may be an evolved node B (eNB), a serving eNB, a target eNB, a femto station, or a pico station, for example. In some embodiments, the UE 204 may be embodied in various types of user devices such as a mobile phone, a smart phone, a personal digital assistant (PDA), tablet, laptop computer, wearable computing device, etc. The processor modules 214 and 236 may be implemented, or realized, with a general purpose processor, a content addressable memory, a digital signal processor, an application specific integrated circuit, a field programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. In this manner, a processor may be realized as a microprocessor, a controller, a microcontroller, a state machine, or the like. A processor may also be implemented as a combination of computing devices, e.g., a combination of a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other such configuration.
Furthermore, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in firmware, in a software module executed by processor modules 214 and 236, respectively, or in any practical combination thereof. The memory modules 216 and 234 may be realized as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. In this regard, memory modules 216 and 234 may be coupled to the processor modules 210 and 230, respectively, such that the processors modules 210 and 230 can read information from, and write information to, memory modules 216 and 234, respectively. The memory modules 216 and 234 may also be integrated into their respective processor modules 210 and 230. In some embodiments, the memory modules 216 and 234 may each include a cache memory for storing temporary variables or other intermediate information during execution of instructions to be executed by processor modules 210 and 230, respectively. Memory modules 216 and 234 may also each include non-volatile memory for storing instructions to be executed by the processor modules 210 and 230, respectively.
The network communication module 218 generally represents the hardware, software, firmware, processing logic, and/or other components of the base station 202 that enable bi-directional communication between base station transceiver 210 and other network components and communication nodes configured to communication with the base station 202. For example, network communication module 218 may be configured to support internet or WiMAX traffic. In a typical deployment, without limitation, network communication module 218 provides an 802.3 Ethernet interface such that base station transceiver 210 can communicate with a conventional Ethernet based computer network. In this manner, the network communication module 218 may include a physical interface for connection to the computer network (e.g., Mobile Switching Center (MSC)). The terms “configured for,” “configured to” and conjugations thereof, as used herein with respect to a specified operation or function, refer to a device, component, circuit, structure, machine, signal, etc., that is physically constructed, programmed, formatted and/or arranged to perform the specified operation or function.
The Open Systems Interconnection (OSI) Model (referred to herein as, “open system interconnection model”) is a conceptual and logical layout that defines network communication used by systems (e.g., wireless communication device, wireless communication node) open to interconnection and communication with other systems. The model is broken into seven subcomponents, or layers, each of which represents a conceptual collection of services provided to the layers above and below it. The OSI Model also defines a logical network and effectively describes computer packet transfer by using different layer protocols. The OSI Model may also be referred to as the seven-layer OSI Model or the seven-layer model. In some embodiments, a first layer may be a physical layer. In some embodiments, a second layer may be a Medium Access Control (MAC) layer. In some embodiments, a third layer may be a Radio Link Control (RLC) layer. In some embodiments, a fourth layer may be a Packet Data Convergence Protocol (PDCP) layer. In some embodiments, a fifth layer may be a Radio Resource Control (RRC) layer. In some embodiments, a sixth layer may be a Non Access Stratum (NAS) layer or an Internet Protocol (IP) layer, and the seventh layer being the other layer.
RRC_INACTIVE state (e.g., as introduced in 3GPP NR Rel-15) may provide a power efficient state with low control-plane latency. For a UE (e.g., the UE 104) in RRC_INACTIVE state, the last serving gNB (e.g., the base station 102) may keep its context and the associated NG connections to the core network, such that all RBs could be recovered immediately after a short random access and RRC resume process on the RAN-side.
However, data transmission without state transition is not supported for the UE in RRC_INACTIVE state (e.g., under 3GPP NR Rel-15). The UE may undergo entering of RRC_CONNECTED state first and then initiate the data transmission. To realize this, a RRC resume process with considerable signaling consumption may be performed at first, even when the UE only has one small data to transmit. Hence, the data transmission without state transition for RRC_INACTIVE UE could cause high signaling overhead and large data transmission delay.
To solve these and other problems, small data transmission for RRC_INACTIVE UE may be considered (e.g., as in 3GPP Rel-17). In some embodiments, a RRC_INACTIVE UE may send one or more small data during the RRC resume process. Alternatively, a RRC_INACTIVE UE may send one or more small data in a configured grant (CG) that may be configured before the UE get into RRC_INACTIVE state. The CG-based small data transmission at a RRC_INACTIVE UE may be leveraged in the present disclosure.
In the CG-based small data transmission at a RRC_INACTIVE UE, a UE may perform its UL data transmission in a beam specified in the CG configuration. For example, a SRI may be provided in the CG configuration when UE is in RRC_CONNECTED state, and UE may use the same beam associated with the indicated SRS resource (as indicated by SRI) for UL transmission in the CG resource. On the side of gNB, a receiving beam may be applied based on the indicated UL beam.
When the UE moves to some other place, however, a new beam direction should be used. If the RRC_INACTIVE UE has the same SRS resources as the RRC_Connected UE, the legacy beam switching method may be applied where gNB use a SRI information in DCI to notify the UE of the desired beam for UL transmission. But when the RRC_INACTIVE UE does not have any SRS resource, performing the beam switching for the data transmission in a CG may differ. Although the UE may find and switch to a better beam for UL transmission based on the receptions of SSBs in different DL beams, gNB may not know that and not adjust its reception beams in UL at all.
Under one approach, beam-switching may be performed without any associated SRS resource configured by RRC. First, a RSSI threshold, RSRP threshold, or RSRQ threshold may be configured in a CG configuration. The CG configuration may trigger a beam-switching process after the RSSI, RSRP, or RSRQ detected by the gNB in the CG is worse than the corresponding threshold. This threshold may be configured for each CG configuration separately, or use a common threshold for all CG configurations (e.g., for the UE for all CG configurations). In some embodiments, a beam-switching indication may be to notify the UE that beam switching action should be supported for a CG configuration. In some embodiments, the threshold may be defined also be notified for UE's information. The beam switching indication and threshold may be contained in a RRC message when a CG is configured, or when an UE is released to RRC_INACTIVE state.
Second, the gNB may notify the low-quality UL receiving state or beam switching request to UE, by MAC CE, or by DCI, when the gNB finds that the UL receiving RSSI, RSRP, RSRQ is worse than the predefined threshold. Third, the UE may measure the SSBs from gNB, and may find one or more best-quality SSBs, and can report the SSB indexes to gNB in the UL CG transmission, either by using MAC CE or DCI signaling. After that, UE may use the reverse beam associated with the reported (best-quality) SSB for its CG data transmission. The detailed time information for UE to perform the beam switching may also be provided, which could be a number of CG periods. In some embodiments, gNB may send a confirmation message to confirm the reception of SSB index. The SSB index may be delivered by either MAC CE or DCI, after gNB receive the SSB index report.
Fourth, the gNB may switch the receiving beam according to SSB index reported by UE in the following CG receiving according to the beam-switching time information if available. Fifth, if the gNB still receives data with bad RSSI, RSRP, or RSRQ after beam switching, the second step may be repeated and the UE may select another good-quality SSB to report. Otherwise, the gNB may notify a high-quality UL receiving state to UE. The receiving state may be 1-bit information in DCI or by MAC CE.
In the above process, in some embodiments, a timer may be activated at UE after performing beam switching, and may stop after receiving the notification of a second low-quality UL receiving state or a high-quality UL receiving state. If the timer expires, the UE may either recover the initial beam in the CG configuration, or may repeat the third step. In some embodiments, the gNB may also have a timer and the corresponding action in the adjustment of receiving beam in UL, which could be used to recover the initial receiving beam.
Referring now to
In some embodiments, a list of keeping-alive CG index may be contained in the SuspendConfig IE in the RRCRelease message. The RRCRelease message may be used by the gNB to release the UE into RRC_INACTIVE state. In this case, the SuspendConfig IE should contain at least one of the following:
The gNB may detect a poor quality in transmission(s) via the CG received using the original receiving beam (e.g., when the beam is determined to have a RSSI, RSRP, or RSRQ than the configured threshold) (315). The gNB may send a bad-receiving-quality notification to UE via MAC CE or by DCI signaling (320). The bad-receiving-quality notification MAC CE or DCI information may contain at least one of the following:
After receiving the bad-receiving-quality notification, UE may measure the receiving quality of SSBs in different DL beams (320). Once measured, the UE may report a SSB index report by using MAC CE or by UCI signaling (325). The detailed information sent via the MAC CE or UCI signaling may contain at least one of the following:
In some embodiments, the gNB may send a SSB index confirmation (in a MAC CE signal/transmission) to UE as the confirmation for the received SSB index MAC CE (330).
When the specified time arrives, the UE may switch to the reverse beam associated with the reported SSB in the UL CG data transmission (335). The gNB may also switch to a corresponding receiving beam according to the report from the UE (340). In some embodiments, a timer may be started or restarted at the UE after the UE's beam switching action.
If gNB may receive the UL data using the CG resource with a better quality than the configured RSSI, RSRP, or RSRQ threshold, the gNB may send a good-receiving-quality notification or beam-keeping request to the UE either by using MAC CE or by DCI signaling (345). The good-receiving-quality notification (sent via MAC CE or DCI signaling) can include information which may contain at least one of the following:
In some embodiments, if the timer started or restarted after UE's beam switching action expire, the UE may repeat (320).
In some embodiments, some new parameters may be introduced to ConfiguredGrantConfig IE (e.g., as specified in 3GPP TS 38.331) to allow beam switching and RRC_INACTIVE-state CG data transmissions as follows when a CG is initially or previously configured. The ConfiguredGrantConfig IE may be sent from the gNB to the UE via any means (e.g., a RRC signal).
The IE ConfiguredGrantConfig may be used to configure uplink transmission without dynamic grant according to two possible schemes. The actual uplink grant may be configured via RRC (type1) or provided via the PDCCH (addressed to CS-RNTI) (type2). Multiple Configured Grant configurations may be configured in one BWP of a serving cell. The ConfiguredGrantConfig information element may be, for example, of the following form:
In some embodiments, three new parameters may be introduced:
The first parameter “keepAliveInactive” may be used to indicate whether or not the CG would be kept alive (or maintained) when UE get into RRC_INACTIVE state. The second parameter “cgBeamSwitching” may be used to indicate whether or not beam switching should be supported in the configured CG when UE get into RRC_INACTIVE state. The third parameter “cgBeamSwitchingThreshhold” may be used to indicate the receiving-quality threshold for gNB to request beam switching, which could contain at least one of the following thresholds:
In some embodiments, parameters may be introduced to RRCRelease message (e.g., as specified in 3GPP TS 38.331) to allow beam switching and RRC_INACTIVE-state CG data transmissions as follows when UE is notified to enter into RRC_INACTIVE state by RRCRelease message. The RRCRelease message may be used to command the release of an RRC connection or the suspension of the RRC connection. In the message, the signaling radio bearer may be SRB1; the radio link control (RLC) service access point (SAP) may be in the acknowledged mode (AM); the logical channel used may be DCCH; and the direction may be from the network (e.g., gNB) to the UE. The RRCRelease message may be, for example, in the following form:
In some embodiments, a new parameter “cgListToKeepAlive” may be used to define a list of CGs to keep alive/active/available when UE get into RRC_INACTIVE state. The parameter may be contained in the RRCRelease message. In some embodiments, the new parameter may be contained in the SuspendConfig IE in the RRCRelease message.
In some embodiments, the new parameter “cgListToKeepAlive” may include a sequence of CGs to be kept alive/active/available. Each of the CGs may be defined as a “CGToKeepAlive” parameter, and contains the following three parameters:
The first parameter “configuredGrantConfigIndexMAC-r16” may be used to indicate the CG index to be kept alive/active/available. The second parameter “cgBeamSwitching” may be used to indicate whether or not beam switching should be supported in the keeping-alive CG when the UE gets into RRC_INACTIVE state. The third parameter “cgBeamSwitchingThreshhold” may be used to indicate the receiving-quality threshold for gNB to request beam switching.
The gNB may detect a poor quality in transmission(s) via the CG received using the original receiving beam (e.g., having a RSSI, RSRP, or RSRQ worse than the configured threshold). The gNB may send a bad-receiving-quality notification or beam-switching request to the UE either by MAC CE signaling or by DCI signaling. The bad-receiving-quality notification (sent via MAC CE or DCI signaling) can include information that may contain at least one of the following:
Furthermore, if gNB receives the UL data via a CG resource with a better quality than the configured RSSI, RSRP, or RSRQ threshold, the gNB may send a good-receiving-quality notification to the UE either by MAC CE signaling or by DCI signaling. The good-receiving-quality notification (sent via MAC CE or DCI signaling) can include information that may contain at least one of the following:
Referring now to
If beam switching is to be performed at the UE, the UE may measure the receiving quality of SSBs in different DL beams, and report a SSB index report by MAC CE signaling or by DCI signaling. The detailed information sent via MAC CE or UCI signaling may include at least one of the following:
Referring now to
Under another approach, beam-switching may be performed with an associated SRS resource configured by RRC. One or more CG-associated SRS resources for UL beam measurement in RRC_INACTIVE state may be configured by gNB in the CG configuration (or RRCRelease message). The CG-associated SRS resource sets with one or more SRS resources in each of these sets may be configured for UL beam measurement in RRC_INACTIVE state. Those CG-associated SRS resource sets may be configured by the gNB in the following RRC messages: (i) by RRC message for CG Configuration, where a CGConfig IE is contained or (ii) by RRCRelease message. The UE may use the SRS resources to transmit SRSs in different beam directions, separately after the UE enters into RRC_INACTIVE state. Then, the gNB may measure the receiving quality of different beams and indicate the expected UL transmission beam by using DCI or MAC CE signaling, similar to legacy operation in the RRC_Connected mode. Furthermore, the configured CG-associated SRS resources may be not in active state by default when the UE enters into RRC_INACTIVE state. When the gNB finds that the UL receiving quality is bad, the gNB may activate the UE by using DCI or MAC CE signaling.
If CG-associated SRS resources are configured, the UE may use the SRS resources to transmit SRSs in different beam directions, separately, after the UE enters into RRC_INACTIVE state. Then, the gNB may measure the receiving quality of different beams and may indicate the expected UL transmission beam by DCI or MAC CE, similar to operation in the RRC_Connected mode. In some embodiments, CG-associated SRS resource sets may be configured for each CG separately, or for all CGs in a UE.
In some embodiments, the SRS resources used by UE in RRC_Connected state may be directly configured to be used by a UE when the UE enters into RRC_INACTIVE state, in the following RRC messages: (i) by RRC message for CG Configuration, where a CGConfig IE is contained or (ii) by RRCRelease message. In this case, the configuration may contain a CG index and one or more IDs of the associated SRS resource sets, which have already been configured.
Furthermore, the configured CG-associated SRS resources may not be in active state upon configuration by default when the UE gets into RRC_INACTIVE state. If the gNB finds that the UL receiving quality is bad, the gNB may activate the configured CG-associated SRS resources by DCI or MAC CE. After/when/if the gNB finds that the UL receiving quality is good, the gNB may deactivate the configured CG-associated SRS resources by using DCI or MAC CE signaling.
Referring now to
In some embodiments, a list of keeping-alive CG index may be contained in the SuspendConfig IE in the RRCRelease message for instance, which is used by the gNB to direct the UE get into RRC_INACTIVE state. In this case, the SuspendConfig IE may contain at least one of the following:
The gNB may detect a poor quality in transmission(s) via the CG received using the original receiving beam (e.g., having a RSSI, RSRP, RSRQ lower than the configured threshold) (615). The gNB may send a SRS-resource activation notification to the UE either via MAC CE or by DCI signaling (620). The SRS-resource activation notification sent via MAC CE or DCI signaling can include information that may include at least one of the following: CG index.
When the SRS-resource activation notification is received, the UE may start to use SRS resources activated (in response to the SRS-resource activation notification) to transmit sounding reference signals in different beam directions, separately (625). Then, the gNB may measure the receiving quality of different beams in the different directions (630). The gNB may indicate the expected UL transmission beam via DCI or MAC CE signaling, similar to the operation in the RRC_Connected mode.
After gNB finds a better UL beam, the gNB may send to the UE a SRI (SRS resource indicator) information for beam switching by MAC CE or DCI (635). The SRI information may include any of the following information:
The CG index may be used to identify a CG in a plurality of CGs. The SRI (SRS resource indicator) may be used to indicate the target UL beam which is used in the transmission of the indicated SRS resource. The time information may define or specify the detailed time when the beam switching is to be performed or initiated. The defined time may correspond to an time offset from the current TTI, CG occasion, subframe, slot, or minislot when the MAC CE or DCI is received. The time offset may be in the unit of TTI, CG period, subframe, frame, slot, or minislot.
In some embodiments, after UE receives the SRI information for beam switching, the UE may send a confirmation message to the gNB (640). The confirmation message may include one of the following information:
The UE may switch UL transmission beam according to gNB's notification from (635) (or the confirmation information sent by the UE from (640)) for the CG indicated by the CG index (645). In some embodiments, the gNB may also adjust its receiving beam correspondingly (650). After beam switching finished, the gNB may send a SRS-resource deactivation notification to UE either by MAC CE or by DCI (655). The SRS-resource deactivation notification may include at least one of the following: CG index.
Referring now to
In further detail, a wireless communication node (e.g., the base station 102 or gNB) may provide, provide, or otherwise send a beam switching configuration for a configuration grant (CG) to a wireless communication device (e.g., the UE 104) (705). The beam switching configuration may define or specify one or more parameters for forming, steering, or otherwise managing beams in accordance with one or more CGs at the wireless communication device when in an inactive state. Each CG may correspond to at least one beam for communications between the wireless communication node and the wireless communication device.
The beam switching configuration for the CG may be generated by the wireless communication node and sent as a radio resource control (RRC) signal (e.g., a RRC connection reconfiguration). The RRC signal may specify or direct the wireless communication device to enter the RRC inactive state. In some embodiments, the wireless communication node may send the beam switching configuration via an RRC message. The RRC message may include one or more parameters to define or specify the beam switching configuration for the beam configuration. In some embodiments, the wireless communication node may send the beam switching configuration via an information element (IE) for the CG configuration in the RRC message. The information element may define, indicate, or otherwise include one or more parameters for the beam configuration.
In some embodiments, the configuration grant may be without any associated sounding reference signal (SRS) resource configured by the RRC. The beam switching configuration may be defined without any associated SRS resources. The beam switching configuration may define, specify, or otherwise include an indication to support beam switching for the wireless communication device. The indication may be for each individual CG at the wireless communication device or for all the CGs at the wireless communication device. The beam switching configuration may define, specify, or otherwise include an indication to maintain one or more of the CGs at the wireless communication device while in (or after entering) the RRC inactive state. The indication may be to specify individual CGs to be maintained or for all the CGs at the wireless communication device. In some embodiments, the beam switching configuration may define, specify, or otherwise include a threshold for triggering/determining beam switching for one or more of the CGs at the wireless communication device. The thresholds may be specified for each CG individually or for all the CGs at the wireless communication device. The thresholds may be in terms of received signal strength indicator (RSSI), reference signal received power (RSRP), reference signal received quality (RSRQ), and signal to noise and interference ratio (SINR), among others.
In some embodiments, the configuration grant may associated with one or more SRS resources configured by the RRC. The beam switching configuration may be defined with reference to one or more SRS resources. The beam switching configuration may include the one or more indicators as discussed above in the configuration without any associated SRS resources, such as: the indication to support beam switching for the wireless communication device; and indication to maintain one or more of the CGs at the wireless communication device after entering and/or while in the RRC inactive state, among others. In addition, the beam switching configuration may define, specify, or otherwise include a configuration for the SRS to be used at the wireless communication device in connected mode while performing beam switching. The configuration may define, include, or otherwise contain information on one or more sets of SRS resources. The information may be defined for individual CGs or for all the CGS at the wireless communication device. In some embodiments, the beam switching configuration may define, specify, or otherwise include one or more thresholds for the beam switching for one or more of the CGs at the wireless communication device. The thresholds may be specified for each CG individually or for all the CGs at the wireless communication device. The thresholds may be in terms of RSSI, RSRP, RSRQ, and SINR, among others.
The wireless communication device may identify or receive the beam switching configuration for the configuration grant from the wireless communication node (710). As discussed above, the beam switching configuration for the CG may be generated by the wireless communication node and sent as a radio resource control (RRC) signal (e.g., a RRC connection reconfiguration). In some embodiments, the wireless communication device may receive the beam switching configuration via an RRC message from the wireless communication node. In some embodiments, the wireless communication device may receive the beam switching configuration via an information element (IE) for the CG configuration in the RRC message from the wireless communication node. Upon receipt, the wireless communication device may parse the RRC message to identify the beam switching configuration for the CGs.
The wireless communication device may initiate transmission of beam while in inactive state (715). From the parsing receipt, the wireless communication device may identify the one or more indicators for the beam switching configuration of the CGs at the wireless communication device. In some embodiments, the wireless communication device may also identify the configuration for the SRS and information on sets of SRS resources from the beam switching configuration. In some embodiments, the wireless communication device may identify the thresholds for beam switching at the CGs from the beam switching configuration. In accordance with (or some period of time after receiving) the beam switching configuration, the wireless communication device may enter the RRC inactive state. The wireless communication device may also configure each CG to transmit the beam to the wireless communication node. The wireless communication device may use the CG in uplink (UL) data transmission to the wireless communication node.
The wireless communication node may identify, detect, or measure a quality of a beam (720). Upon transmitting the RRC message, the wireless communication node may monitor for beams (e.g., UL data transmissions) from the wireless communication device. Upon detecting or receipt of the beam from the wireless communication device, the wireless communication node may determine the quality of the beam. The quality of the beam may be in terms of RSSI, RSRP, RSRQ, and SINR to compare against the threshold. In some embodiments, the wireless communication node may determine the quality of beam at each individual CG at the wireless communication device.
The wireless communication node may determine whether the quality of beam satisfies the threshold (725). In determining, the wireless communication node may identify, calculate, or otherwise determine the threshold for the beam switching. The threshold may be used to compare against the quality of the beam (e.g., the UL data transmission), and may delineate a value for the quality at which to either maintain or initiate beam switching. To determine whether the quality of beam is adequate or acceptable, the wireless communication node may identify the threshold(s) from the beam switching configuration for the CGs at the wireless communication device. With the determination or identification of a corresponding threshold, the wireless communication node may compare the quality of the beam with the corresponding threshold for the beam switching at the respective CG. Based on the comparison, the wireless communication node may identify, determine, or otherwise detect that the quality of the beam is below threshold or greater than or equal to the threshold.
When the quality of beam satisfies (e.g., greater than or equal to) the threshold, the wireless communication node may continue using the beam (730). In some embodiments, the wireless communication node may transmit, provide, or otherwise send a notification (e.g., good-receiving-equality notification) to the wireless communication device. The notification may include or identify an indication that the beam is of good or satisfactory quality. The notification may indicate or signal to the wireless communication device to continue or keep using the beam. In addition, the notification may identify or include a CG index indicating which CG at the wireless communication device is associated with the beam determined to have quality above the threshold. The notification may be transmitted by the wireless communication node to the wireless communication device via a media access control (MAC) control element (CE) or via downlink control information (DCI).
Otherwise, when the quality of beam does not (e.g., less than) satisfy the threshold, the wireless communication node may transmit, provide, or otherwise send a request (735). The request (sometimes referred herein as a bad receiving-quality notification) may signal, trigger, or direct the wireless communication device to perform beam switching. The request may identify or include an indication that the beam is of bad or unsatisfactory quality (e.g., below the corresponding threshold). In some embodiments, the request may identify or include a CG index indicating which CG at the wireless communication device is associated with the beam determined to have a transmission quality below the threshold. In some embodiments, the wireless communication node may send a request to activate one or more SRS resources at the wireless communication device that is in the RRC inactive state. The request to activate (sometimes referred herein as a notification to activate) may be sent by the wireless communication node to the wireless communication device when the quality of beam does not satisfy the threshold. The request to activate may signal, trigger, or direct the wireless communication device to transmit SRSs in different beam directions to perform beam switching. The request to activate may also identify or include the CG index indicating which CG at the wireless communication device is associated with the beam determined to have the quality below the threshold. The request (to perform beam switching or activate SRS resources) may be transmitted by the wireless communication node to the wireless communication device via a MAC CE or via DCI.
The wireless communication device may identify or receive the request from the wireless communication node (740). When the quality of the beam is determined to be below the threshold, the wireless communication device may receive the request to perform beam switching from the wireless communication device. In some embodiments, the wireless communication device may receive the request to activate one or more SRS resources from the wireless communication node. In some embodiments, the wireless communication device may receive the request to activate when the quality of beam sent via the corresponding CG is below the threshold. The request (to perform beam switching or activate SRS resources) may be received by the wireless communication device as a MAC CE or via DCI.
An index for the new beam may be determined, found, or otherwise identified by the wireless communication device (745) or by the wireless communication node (745′). The index may be identified in accordance with the request. When the request is to perform beam switching, the wireless communication device may initiate to perform beam switching. The wireless communication device may identify, determine, or measure quality of each of the synchronization signal blocks (SSBs) in different DL beams. The quality may be in terms of RSSI, RSRP, or RSRQ, among others. With the measurement, the wireless communication device may identify one or more SSBs having the best quality (e.g., highest quality) from the set of SSBs. In some embodiments, the wireless communication device may determine or identify time information to initiate the beam switching (e.g., for UL data transmissions). The time information may indicate a CG period, frame, slot, or mini-slot for the new beams applied for the beam switching.
Prior to performing beam switching, the wireless communication device may transmit, provide, or otherwise send at least one of the indication of the SSB(s) identified as having best quality and the time information. The wireless communication node may in turn identify or receive the indication of the SSB(s) and the time information for performing the beam switching from the wireless communication device. In some embodiments, the wireless communication node may transmit, provide, or otherwise send a confirmation in response to the indication of the SSB(s) to the wireless communication device. The confirmation may indicate that the wireless communication device is to initiate beam switching using the SSB(s) in the indication. The wireless communication device may in turn receive the confirmation from the wireless communication node.
When the request is to activate SRS resources, the wireless communication device may transmit, provide, or otherwise send the set of SRSes to the wireless communication node. Each SRS may be transmitted in different beam directions. The wireless communication node may in turn identify, measure and/or receive the set of SRSes from the wireless communication device. Upon receipt, the wireless communication node may identify, determine, or measure the receiving quality of each beam transmitted by the wireless communication device. The quality may be in terms of RSSI, RSRP, or RSRQ, among others. In some embodiments, the wireless communication device may be in the RRC connected mode during the measurement of the quality of the beams. With the measurements, the wireless communication node may identify one or more SRSes having the best quality (e.g., highest quality) from the set of SRSes.
The wireless communication node may transmit, provide, or otherwise send an indication of SRS(es) (e.g., using a SRI) identified as having the best quality to the wireless communication device. The wireless communication device may identify or receive the indication of SRSes from the wireless communication node. Upon receipt, the wireless communication device may determine or identify time information to initiate the beam switching (e.g., for UL data transmissions). The time information may indicate a CG period, frame, slot, or mini-slot for the new beams applied for the beam switching. In some embodiments, the wireless communication device may transmit, provide, or send a confirmation for the indication of the SRS(es) to the wireless communication node. The confirmation may indicate or signal to the wireless communication node that the wireless communication device is to initiate beam switching. The wireless communication node may in turn identify or receive the confirmation for the indication of SRS(es) from the wireless communication device.
Beam switching may be performed by the wireless communication device (750) or by the wireless communication node (750′). The wireless communication device may be still in the RRC inactive state. When in the RRC inactive state, the wireless communication device may perform beam switching via the CG with the wireless communication node. In some embodiments, the beam switching may be in accordance with SSB(es) identified as having the best quality. To perform the beam switching, the wireless communication device may transmit or send UL data to the wireless communication node. The UL data may be transmitted by the wireless communication device via the CG using a new transmission beam that corresponds to the indication of the SSB identified as having the best quality. The new transmission beam may be generated and transmitted in accordance with the SSB in the indication and time information. The wireless communication node may in turn identify or receive the UL data from the wireless communication device. The wireless communication device may communicate with the wireless communication node via the CG using the new transmission beam.
In some embodiments, the beam switching performed by the wireless communication device may be in accordance with the SRS(es) identified as having the best quality. The wireless communication device may transmit or send the UL data to the wireless communication node. The UL data may be transmitted by the wireless communication node via the CG using a new transmission beam that corresponds to the indication of the SRS identified as having the best quality. The new transmission beam may be generated and transmitted in accordance with the SRS in the indication and the time information. The wireless communication node may in turn identify or receive the UL data from the wireless communication device. The wireless communication device may communicate with the wireless communication node via the CG using the new transmission beam.
The wireless communication node may transmit, provide, or send an indication (755). In performing the beam switching, the wireless communication node may identify, determine, or measure the quality of the new beam transmission via the respective CG from the wireless communication device in a similar manner as discussed above in (720). The quality of the beam may be in terms of RSSI, RSRP, RSRQ, and SINR to compare against the threshold. With the measurement of the quality of the new beam transmission, the wireless communication node may compare the quality of the beam against the threshold from the beam switching configuration for the CG.
Based on the comparison, the wireless communication node may generate the indication. In some embodiments, the generation of the indication may also be based on whether SRS was relied on for beam switching. When the quality of beam satisfies the threshold, the wireless communication node may generate and send the indication to keep the new beam. The indication may also identify or include another indication that the quality of the new beam satisfies the threshold. When SRS was used to perform beam switching, the wireless communication node may generate and send a message (or indication) to deactivate the SRS at the wireless communication device. In some embodiments, the message may also indicate or signal the wireless communication device to change from RRC connected mode to the RRC inactive state. The wireless communication node may send the message to deactivate when the quality of beam received via the CG is determined to satisfy (e.g., higher) than the threshold. When the quality of beam does not satisfy the threshold, the wireless communication node and the wireless communication device may repeat the functionality/operations of (735)—(750′).
The wireless communication device may identify or receive the indication from the wireless communication node (760). In some embodiments, the wireless communication device may in turn receive the indication to keep the new beam when the quality of new beam satisfies (e.g., higher than) the threshold for beam switching. Upon receipt, the wireless communication device may parse to identify the indication to keep the new beam. Based on the identification, the wireless communication device may continue to use the beam via the CG for UL transmission with the wireless communication node. The wireless communication device may also transmit, provide, or send a confirmation in response to the indication to the wireless communication node. The confirmation may indicate that the wireless communication device is to continue using the beam. The wireless communication node may in turn identify or receive the confirmation transmitted by the wireless communication device.
In some embodiments, the wireless communication device may in turn identify or receive the message to deactivate from the wireless communication node. The receipt of the message to deactivate may be received when the quality of the new beam sent via the CG is determined to satisfy (e.g., higher than) the threshold. Upon receipt, the wireless communication device may parse the message. In response, the wireless communication device may deactivate the SRS (e.g., transmissions of SRSes). In some embodiments, the wireless communication device may revert to the RRC inactivate state. The wireless communication device may also transmit, provide, or send a confirmation in response to the message to the wireless communication node. The confirmation may indicate that the wireless communication device has deactivated the SRS(es). The wireless communication node in turn may receive the confirmation from the wireless communication device.
While various embodiments of the present solution have been described above, it should be understood that they have been presented by way of example only, and not by way of limitation. Likewise, the various diagrams may depict an example architectural or configuration, which are provided to enable persons of ordinary skill in the art to understand example features and functions of the present solution. Such persons would understand, however, that the solution is not restricted to the illustrated example architectures or configurations, but can be implemented using a variety of alternative architectures and configurations. Additionally, as would be understood by persons of ordinary skill in the art, one or more features of one embodiment can be combined with one or more features of another embodiment described herein. Thus, the breadth and scope of the present disclosure should not be limited by any of the above-described illustrative embodiments.
It is also understood that any reference to an element herein using a designation such as “first,” “second,” and so forth does not generally limit the quantity or order of those elements. Rather, these designations can be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to first and second elements does not mean that only two elements can be employed, or that the first element must precede the second element in some manner.
Additionally, a person having ordinary skill in the art would understand that information and signals can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits and symbols, for example, which may be referenced in the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
A person of ordinary skill in the art would further appreciate that any of the various illustrative logical blocks, modules, processors, means, circuits, methods and functions described in connection with the aspects disclosed herein can be implemented by electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two), firmware, various forms of program or design code incorporating instructions (which can be referred to herein, for convenience, as “software” or a “software module), or any combination of these techniques. To clearly illustrate this interchangeability of hardware, firmware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware or software, or a combination of these techniques, depends upon the particular application and design constraints imposed on the overall system. Skilled artisans can implement the described functionality in various ways for each particular application, but such implementation decisions do not cause a departure from the scope of the present disclosure.
Furthermore, a person of ordinary skill in the art would understand that various illustrative logical blocks, modules, devices, components and circuits described herein can be implemented within or performed by an integrated circuit (IC) that can include a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, or any combination thereof. The logical blocks, modules, and circuits can further include antennas and/or transceivers to communicate with various components within the network or within the device. A general purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, or state machine. A processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other suitable configuration to perform the functions described herein.
If implemented in software, the functions can be stored as one or more instructions or code on a computer-readable medium. Thus, the steps of a method or algorithm disclosed herein can be implemented as software stored on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that can be enabled to transfer a computer program or code from one place to another. A storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.
In this document, the term “module” as used herein, refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Additionally, for purpose of discussion, the various modules are described as discrete modules; however, as would be apparent to one of ordinary skill in the art, two or more modules may be combined to form a single module that performs the associated functions according embodiments of the present solution.
Additionally, memory or other storage, as well as communication components, may be employed in embodiments of the present solution. It will be appreciated that, for clarity purposes, the above description has described embodiments of the present solution with reference to different functional units and processors. However, it will be apparent that any suitable distribution of functionality between different functional units, processing logic elements or domains may be used without detracting from the present solution. For example, functionality illustrated to be performed by separate processing logic elements, or controllers, may be performed by the same processing logic element, or controller. Hence, references to specific functional units are only references to a suitable means for providing the described functionality, rather than indicative of a strict logical or physical structure or organization.
Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the scope of this disclosure. Thus, the disclosure is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the novel features and principles disclosed herein, as recited in the claims below.
This application claims the benefit of priority under 35 U.S.C. § 120 as a continuation of PCT Patent Application No. PCT/CN2020/097165, filed on Jun. 19, 2020, the disclosure of which is incorporated herein by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/CN2020/097165 | Jun 2020 | US |
| Child | 18080340 | US |
