WO2021248306A1 - Techniques d'amélioration de performance d'accès aléatoire - Google Patents

Techniques d'amélioration de performance d'accès aléatoire Download PDF

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Publication number
WO2021248306A1
WO2021248306A1 PCT/CN2020/095087 CN2020095087W WO2021248306A1 WO 2021248306 A1 WO2021248306 A1 WO 2021248306A1 CN 2020095087 W CN2020095087 W CN 2020095087W WO 2021248306 A1 WO2021248306 A1 WO 2021248306A1
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Prior art keywords
random access
access procedure
procedure
message
access message
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PCT/CN2020/095087
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English (en)
Inventor
Jinglin Zhang
Haojun WANG
Yi Liu
Zhenqing CUI
Hong Wei
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Qualcomm Incorporated
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Priority to PCT/CN2020/095087 priority Critical patent/WO2021248306A1/fr
Publication of WO2021248306A1 publication Critical patent/WO2021248306A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/14—Access restriction or access information delivery, e.g. discovery data delivery using user query or user detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for random access.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, etc. These wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc. ) .
  • available system resources e.g., bandwidth, transmit power, etc.
  • multiple-access systems examples include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE Advanced (LTE-A) systems, 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, to name a few.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • New radio e.g., 5G NR
  • 5G NR is an example of an emerging telecommunication standard.
  • NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP.
  • NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL) .
  • CP cyclic prefix
  • NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • MIMO multiple-input multiple-output
  • the method generally includes determining that a first random access procedure is triggered while a second random access procedure is ongoing, the first random access procedure and the second random access procedure being associated with different contention resolution types; generating a random access message including a common control channel (CCCH) and a cell-radio network temporary identifier (C-RNTI) medium access control (MAC) -control element (CE) , based on the determination; and transmitting the random access message to the base station.
  • CCCH common control channel
  • C-RNTI cell-radio network temporary identifier
  • CE medium access control
  • the method generally includes receiving a random access message including a common control channel (CCCH) and a cell-radio network temporary identifier (C-RNTI) medium access control (MAC) -control element (CE) ; determining that the random access message is associated with a first random access procedure that is triggered while a second random access procedure is ongoing, the first random access procedure and the second random access procedure being associated with different contention resolution types; and transmitting another random access message based on the determination.
  • CCCH common control channel
  • C-RNTI cell-radio network temporary identifier
  • CE medium access control
  • aspects of the present disclosure provide means for, apparatus, processors, and computer-readable mediums for performing the methods described herein.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the appended 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.
  • FIG. 1 is a block diagram conceptually illustrating an example telecommunications system, in accordance with certain aspects of the present disclosure.
  • FIG. 2 is a block diagram conceptually illustrating a design of an example a base station (BS) and user equipment (UE) , in accordance with certain aspects of the present disclosure.
  • BS base station
  • UE user equipment
  • FIG. 3 is an example frame format for new radio (NR) , in accordance with certain aspects of the present disclosure.
  • FIG. 4 is a flow diagram illustrating example operations for wireless communication, in accordance with certain aspects of the present disclosure.
  • FIG. 5 is a flow diagram illustrating example operations for wireless communication, in accordance with certain aspects of the present disclosure.
  • FIG. 6 illustrates example multi-random access (RA) operations, in accordance with certain aspects of the present disclosure.
  • FIG. 7 illustrates a communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure.
  • aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for multi-random access (RA) operations.
  • the UE may generate a random access message to facilitate multiple contention based random access procedures.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies.
  • RAT may also be referred to as a radio technology, an air interface, etc.
  • a frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, a subband, etc.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • the techniques described herein may be used for various wireless networks and radio technologies. While aspects may be described herein using terminology commonly associated with 3G, 4G, and/or new radio (e.g., 5G NR) wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems.
  • 3G, 4G, and/or new radio e.g., 5G NR
  • NR access may support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or beyond) , millimeter wave (mmW) targeting high carrier frequency (e.g., 25 GHz or beyond) , massive machine type communications MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra-reliable low-latency communications (URLLC) .
  • eMBB enhanced mobile broadband
  • mmW millimeter wave
  • mMTC massive machine type communications MTC
  • URLLC ultra-reliable low-latency communications
  • These services may include latency and reliability requirements.
  • These services may also have different transmission time intervals (TTI) to meet respective quality of service (QoS) requirements.
  • TTI transmission time intervals
  • QoS quality of service
  • these services may co-exist in the same subframe.
  • NR supports beamforming and beam direction may be dynamically configured. MIMO transmissions with precoding may also be supported.
  • MIMO configurations in the DL may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. Multi-layer transmissions with up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells.
  • FIG. 1 illustrates an example wireless communication network 100 in which aspects of the present disclosure may be performed.
  • the wireless communication network 100 may be an NR system (e.g., a 5G NR network) .
  • the wireless communication network 100 may be in communication with a core network 132.
  • the core network 132 may in communication with one or more base station (BSs) 110 and/or user equipment (UE) 120 in the wireless communication network 100 via one or more interfaces.
  • BSs base station
  • UE user equipment
  • the wireless communication network 100 may include a number of BSs 110a-z (each also individually referred to herein as BS 110 or collectively as BSs 110) and other network entities.
  • a BS 110 may provide communication coverage for a particular geographic area, sometimes referred to as a “cell” , which may be stationary or may move according to the location of a mobile BS 110.
  • the BSs 110 may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in wireless communication network 100 through various types of backhaul interfaces (e.g., a direct physical connection, a wireless connection, a virtual network, or the like) using any suitable transport network.
  • backhaul interfaces e.g., a direct physical connection, a wireless connection, a virtual network, or the like
  • the BSs 110a, 110b and 110c may be macro BSs for the macro cells 102a, 102b and 102c, respectively.
  • the BS 110x may be a pico BS for a pico cell 102x.
  • the BSs 110y and 110z may be femto BSs for the femto cells 102y and 102z, respectively.
  • a BS may support one or multiple cells.
  • a network controller 130 may couple to a set of BSs 110 and provide coordination and control for these BSs 110 (e.g., via a backhaul) .
  • the BSs 110 communicate with UEs 120a-y (each also individually referred to herein as UE 120 or collectively as UEs 120) in the wireless communication network 100.
  • the UEs 120 (e.g., 120x, 120y, etc. ) may be dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile.
  • Wireless communication network 100 may also include relay stations (e.g., relay station 110r) , also referred to as relays or the like, that receive a transmission of data and/or other information from an upstream station (e.g., a BS 110a or a UE 120r) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE 120 or a BS 110) , or that relays transmissions between UEs 120, to facilitate communication between devices.
  • relay stations e.g., relay station 110r
  • relays or the like that receive a transmission of data and/or other information from an upstream station (e.g., a BS 110a or a UE 120r) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE 120 or a BS 110) , or that relays transmissions between UEs 120, to facilitate communication between devices.
  • the BSs 110 and UEs 120 may be configured for multi-RA operations.
  • the BS 110a includes a RA manager 112.
  • the RA manager 112 may be configured to receive a random access message including a common control channel (CCCH) and a cell-radio network temporary identifier (C-RNTI) medium access control (MAC) -control element (CE) , determine that the random access message is associated with a first random access procedure that is triggered while a second random access procedure is ongoing, the first random access procedure and the second random access procedure being associated with different contention resolution types, and transmit another random access message based on the determination, in accordance with aspects of the present disclosure.
  • the UE 120a includes an RA manager 122.
  • the RA manager 122 may be configured to determine that a first random access procedure is triggered while a second random access procedure is ongoing, the first random access procedure and the second random access procedure being associated with different contention resolution types, generate a random access message including a common control channel (CCCH) and a cell-radio network temporary identifier (C-RNTI) medium access control (MAC) -control element (CE) , based on the determination, and transmit the random access message to the base station, in accordance with aspects of the present disclosure.
  • CCCH common control channel
  • C-RNTI cell-radio network temporary identifier
  • CE medium access control element
  • FIG. 2 illustrates example components of BS 110a and UE 120a (e.g., in the wireless communication network 100 of FIG. 1) , which may be used to implement aspects of the present disclosure.
  • a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240.
  • the control information may be for the physical broadcast channel (PBCH) , physical control format indicator channel (PCFICH) , physical hybrid ARQ indicator channel (PHICH) , physical downlink control channel (PDCCH) , group common PDCCH (GC PDCCH) , etc.
  • the data may be for the physical downlink shared channel (PDSCH) , etc.
  • a medium access control (MAC) -control element (MAC-CE) is a MAC layer communication structure that may be used for control command exchange between wireless nodes.
  • the MAC-CE may be carried in a shared channel such as a physical downlink shared channel (PDSCH) , a physical uplink shared channel (PUSCH) , or a physical sidelink shared channel (PSSCH) .
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • PSSCH physical sidelink shared channel
  • the processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the transmit processor 220 may also generate reference symbols, such as for the primary synchronization signal (PSS) , secondary synchronization signal (SSS) , and channel state information reference signal (CSI-RS) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 232a-232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • MIMO multiple-input multiple-output
  • Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 232a-232t may be transmitted via the antennas 234a-234t, respectively.
  • the antennas 252a-252r may receive the downlink signals from the BS 110a and may provide received signals to the demodulators (DEMODs) in transceivers 254a-254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all the demodulators 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120a to a data sink 260, and provide decoded control information to a controller/processor 280.
  • a transmit processor 264 may receive and process data (e.g., for the physical uplink shared channel (PUSCH) ) from a data source 262 and control information (e.g., for the physical uplink control channel (PUCCH) from the controller/processor 280.
  • the transmit processor 264 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS) ) .
  • the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modulators in transceivers 254a-254r (e.g., for SC-FDM, etc. ) , and transmitted to the BS 110a.
  • the uplink signals from the UE 120a may be received by the antennas 234, processed by the modulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120a.
  • the receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to the controller/processor 240.
  • the memories 242 and 282 may store data and program codes for BS 110a and UE 120a, respectively.
  • a scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.
  • Antennas 252, processors 266, 258, 264, and/or controller/processor 280 of the UE 120a and/or antennas 234, processors 220, 230, 238, and/or controller/processor 240 of the BS 110a may be used to perform the various techniques and methods described herein.
  • the controller/processor 240 of the BS 110a has an RA manager 112, according to aspects described herein.
  • the controller/processor 280 of the UE 120a has an RA manager 122, according to aspects described herein.
  • other components of the UE 120a and BS 110a may be used to perform the operations described herein.
  • NR may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink.
  • OFDM orthogonal frequency division multiplexing
  • CP cyclic prefix
  • NR may support half-duplex operation using time division duplexing (TDD) .
  • OFDM and single-carrier frequency division multiplexing (SC-FDM) partition the system bandwidth into multiple orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier may be modulated with data. Modulation symbols may be sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers may be dependent on the system bandwidth.
  • the minimum resource allocation may be 12 consecutive subcarriers.
  • the system bandwidth may also be partitioned into subbands. For example, a subband may cover multiple RBs.
  • NR may support a base subcarrier spacing (SCS) of 15 KHz and other SCS may be defined with respect to the base SCS (e.g., 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc. ) .
  • SCS base subcarrier spacing
  • FIG. 3 is a diagram showing an example of a frame format 300 for NR.
  • the transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames.
  • Each radio frame may have a predetermined duration (e.g., 10 ms) and may be partitioned into 10 subframes, each of 1 ms, with indices of 0 through 9.
  • Each subframe may include a variable number of slots (e.g., 1, 2, 4, 8, 16, ...slots) depending on the SCS.
  • Each slot may include a variable number of symbol periods (e.g., 7 or 14 symbols) depending on the SCS.
  • the symbol periods in each slot may be assigned indices.
  • a mini-slot which may be referred to as a sub-slot structure, refers to a transmit time interval having a duration less than a slot (e.g., 2, 3, or 4 symbols) .
  • Each symbol in a slot may indicate a link direction (e.g., DL, UL, or flexible) for data transmission and the link direction for each subframe may be dynamically switched.
  • the link directions may be based on the slot format.
  • Each slot may include DL/UL data as well as DL/UL control information.
  • random access procedure can be used for uplink (UL) synchronization, to request UL grant, or request other system information (OSI) .
  • a random access procedure may be triggered by the UE itself or by the network independently. Therefore, the network or the UE may trigger a random access procedure when another random access procedure is ongoing.
  • a procedure is introduced for a UE to request transmission of OSI using a random access procedure.
  • a random access procedure may be initiated by a physical downlink control channel (PDCCH) order, by a medium access control (MAC) entity, or by radio resource control (RRC) .
  • PDCCH order is a mechanism by which a base station (BS) may attempt to force a UE to initiate the random access procedure.
  • BS base station
  • RRC radio resource control
  • PDCCH order is a mechanism by which a base station (BS) may attempt to force a UE to initiate the random access procedure.
  • BS base station
  • RRC radio resource control
  • PDCCH order is a mechanism by which a base station (BS) may attempt to force a UE to initiate the random access procedure.
  • BS base station
  • RRC radio resource control
  • contention resolution types there may be two types contention resolution types based on information received in the third message (msg3) (e.g., contention request) of the random access procedure.
  • Msg3 includes a cell-radio network temporary identifier (C-RNTI) MAC CE
  • Msg4 e.g., contention resolution
  • DCI downlink control information
  • Msg3 includes an uplink (UL) -common control channel (CCCH) message
  • TC-RNTI temporary C-RNTI
  • TC-RNTI temporary C-RNTI
  • the UL CCCH message may include an RRC setup request, an RRC resume request, an RRC reestablishment request, or RRC system information request.
  • RRC setup request may only be triggered on RRC idle
  • RRC resume request may only be triggered on RRC inactive
  • RRC reestablishment request may be triggered when radio link failure (RLF) occurs in RRC connected mode
  • RRC system information request may be triggered in RRC idle, RRC inactive, and RRC connected modes.
  • the RRC system information request may be used by the UE request transmission of system information.
  • a first random access procedure may be associated with a scheduling request (SR) failure CBRA, a PDCCH order CBRA, or a beam failure recovery (BFR) CBRA
  • a second random access procedure may be associated with an other system information (OSI) CBRA (CBRA for an RRC system information request (e.g., rrcSystemInfoRequest) ) .
  • SR scheduling request
  • PDCCH order CBRA PDCCH order CBRA
  • BFR beam failure recovery
  • OSI system information
  • the Msg3 for SR failure CBRA, PDDCH order CBRA, and BFR CBRA may include a C-RNTI MAC CE, but the Msg3 for OSI CBRA may include a UL CCCH. Therefore, the Msg4 for SR failure CBRA, PDDCH order CBRA, and BFR CBRA may be a C-RNTI scrambled DCI, and the Msg4 for OSI CBRA may scrambled with TC-RNTI.
  • one CBRA may be triggered while another CBRA is ongoing.
  • the UE may be connected for NR.
  • SR transmissions by the UE may fail, resulting in the UE triggering CBRA.
  • the UE may then trigger an OSI CBRA while the SR failure CBRA is ongoing, at which point, the UE may select to continue the ongoing SR failure CBRA.
  • the UE may trigger OSI CBRA again.
  • FIG. 4 is a flow diagram illustrating example operations 400 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 400 may be performed, for example, by a BS (e.g., such as the BS 110a in the wireless communication network 100) .
  • a BS e.g., such as the BS 110a in the wireless communication network 100.
  • Operations 400 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 240 of FIG. 2) . Further, the transmission and reception of signals by the BS in operations 400 may be enabled, for example, by one or more antennas (e.g., antennas 234 of FIG. 2) . In certain aspects, the transmission and/or reception of signals by the BS may be implemented via a bus interface of one or more processors (e.g., controller/processor 240) obtaining and/or outputting signals.
  • processors e.g., controller/processor 240
  • the operations 400 may begin, at block 405, by the BS receiving a random access message including a CCCH and a C-RNTI MAC-CE.
  • the BS may determine that the random access message is associated with a first random access procedure that is triggered while a second random access procedure is ongoing, the first random access procedure and the second random access procedure being associated with different contention resolution types, and at block 415, transmit another random access message based on the determination.
  • FIG. 5 is a flow diagram illustrating example operations 500 for wireless communication, in accordance with certain aspects of the present disclosure.
  • the operations 500 may be performed, for example, by UE (e.g., such as a UE 120a in the wireless communication network 100) .
  • UE e.g., such as a UE 120a in the wireless communication network 100.
  • the operations 500 may be complimentary operations by the UE to the operations 400 performed by the BS.
  • Operations 500 may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor 280 of FIG. 2) .
  • the transmission and reception of signals by the UE in operations 500 may be enabled, for example, by one or more antennas (e.g., antennas 252 of FIG. 2) .
  • the transmission and/or reception of signals by the UE may be implemented via a bus interface of one or more processors (e.g., controller/processor 280) obtaining and/or outputting signals.
  • the operations 500 may begin, at block 505, by the UE determining that a first random access procedure is triggered while a second random access procedure is ongoing, the first random access procedure and the second random access procedure being associated with different contention resolution types.
  • the first random access procedure or the second random access procedure is triggered based on a scheduling request failure, a PDCCH order, or beam failure.
  • the first random access procedure or the second random access procedure may be an other system information (OSI) contention based random access (CBRA) procedure.
  • OSI system information
  • CBRA contention based random access
  • the UE may generate a random access message including a CCCH and a C-RNTI MAC-CE, based on the determination, and at block 515, transmit the random access message to the base station.
  • the random access message may be generated to continue the second random access procedure.
  • the CCCH in the random access message may include a request for system information to be transmitted by the base station.
  • the UE may receive, from the BS, another random access message transmitted in response to the random access message, the reception of the other random access message acknowledging the request for the system information.
  • the UE may indicate, to one or more upper layers (e.g., RRC layer) , that the request for system information is acknowledged in response to the reception of the other random access message.
  • the first random access procedure or the second random access procedure is triggered based on a scheduling request failure.
  • the other random access message e.g., Msg4
  • DCI downlink control information
  • the other random access message may be a contention resolution message for the ongoing second random access procedure.
  • FIG. 6 illustrates example multi-random access (RA) operations 600, in accordance with certain aspects of the present disclosure.
  • the UE 602 may connect to NR.
  • the UE 602 may then transmit SR (s) 606 to the base station 604.
  • the UE 602 may not receive a response from the base station 604, and when a configured maximum SR transmissions is reached, the UE may declare that SR operations have failed, and may trigger a CBRA due to the SR failure, at block 608.
  • the UE 602 may transmit Msg1 612 (e.g., random access preamble) for the CBRA. While the CBRA is ongoing, an OSI CBRA may be triggered at block 614, as illustrated.
  • Msg1 612 e.g., random access preamble
  • the UE 602 may continue the ongoing CBRA, but determine to generate Msg3 for the ongoing CBRA to include at least an UL CCCH (e.g., including an RRC system information request) for the OSI CBRA and a C-RNTI MAC-CE for the SR failure CBRA.
  • the UE may transmit Msg1 616 (e.g., random access preamble) , receive Msg2 618 (e.g., random access response) , transmit Msg3 620 (e.g. contention request) , and receive Msg4 622 (e.g., contention resolution) .
  • Msg3 may include an UL CCCH and a C-RNTI MAC-CE.
  • the UE may determine that SR CBRA is successful, and moreover, declare that OSI CBRA is successful. For example, the UE may indicate that reception of acknowledgement of system information request to upper layers of the UE.
  • the contention resolution may be considered as successful, ra-ContentionResolutionTimer may be stopped, the TEMPORARY_C-RNTI may be discarded, and the random access procedure may be considered successfully completed.
  • the ra-ContentionResolutionTimer is timer started after reception of Msg3 and during which the UE monitors PDCCH for Msg4.
  • the UL CCCH is rrcSystemInfoRequest
  • the reception of an acknowledgement for SI request may be indicated to upper layers.
  • a CCCH service data unit (SDU) was included in Msg3 and the PDCCH transmission is addressed to a TEMPORARY_C-RNTI, and if the MAC protocol data unit (PDU) is successfully decoded, the ra-ContentionResolutionTimer may be stopped. If the MAC PDU contains a UE Contention Resolution Identity MAC CE, and if the UE Contention Resolution Identity in the MAC CE matches the CCCH SDU transmitted in Msg3, the UE may consider the contention resolution successful and finish the disassembly and demultiplexing of the MAC PDU. If the random access procedure was initiated for SI request, the reception of an acknowledgement for SI request may be indicated to upper layers.
  • the C-RNTI may be set to the value of the TEMPORARY_C-RNTI.
  • the TEMPORARY_C-RNTI may be then discarded, the random access procedure may be considered successfully completed. If the UE Contention Resolution Identity in the MAC CE does not matches the CCCH SDU transmitted in Msg3, the TEMPORARY_C-RNTI may be discarded, and the Contention Resolution may considered not successful and the successfully decoded MAC PDU may be discarded.
  • OSI CBRA may be ongoing, when another CBRA (e.g., SR failure CBRA, PDCCH order CBRA, or BFR CBRA) is triggered.
  • the UE may generate Msg3 to include both UL CCCH and C-RNTI MAC CE, and continue the ongoing OSI CBRA.
  • the ongoing CBRA may be an SR failure CBRA, PDCCH order CBRA, or BFR CBRA.
  • OSI CBRA may be triggered.
  • the UE may generate Msg3 to include both UL CCCH and C-RNTI MAC CE, and continue the ongoing CBRA (SR failure CBRA, PDCCH order CBRA, or BFR CBRA.
  • FIG. 7 illustrates a communications device 700 that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated in FIGs. 4-5.
  • the communications device 700 includes a processing system 702 coupled to a transceiver 708 (e.g., a transmitter and/or a receiver) .
  • the transceiver 708 is configured to transmit and receive signals for the communications device 700 via an antenna 710, such as the various signals as described herein.
  • the processing system 702 may be configured to perform processing functions for the communications device 700, including processing signals received and/or to be transmitted by the communications device 700.
  • the processing system 702 includes a processor 704 coupled to a computer-readable medium/memory 712 via a bus 706.
  • the computer-readable medium/memory 712 is configured to store instructions (e.g., computer-executable code) that when executed by the processor 704, cause the processor 704 to perform the operations illustrated in FIGs. 4-5, or other operations for performing the various techniques discussed herein for multi-random access operations.
  • computer-readable medium/memory 712 stores code 714 for receiving/transmitting; code 716 for determining; code 718 for generating; and code 720 for indicating.
  • the processor 704 has circuitry configured to implement the code stored in the computer-readable medium/memory 712.
  • the processor 704 includes circuitry 722 for receiving/transmitting; circuitry 724 for determining; circuitry 726 for generating; and circuitry 728 for indicating.
  • NR e.g., 5G NR
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • a CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA) , cdma2000, etc.
  • UTRA Universal Terrestrial Radio Access
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • cdma2000 covers IS-2000, IS-95 and IS-856 standards.
  • a TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • GSM Global System for Mobile Communications
  • An OFDMA network may implement a radio technology such as NR (e.g. 5G RA) , Evolved UTRA (E-UTRA) , Ultra Mobile Broadband (UMB) , IEEE 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDMA, etc.
  • NR e.g. 5G RA
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Flash-OFDMA
  • UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS) .
  • LTE and LTE-A are releases of UMTS that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP) .
  • cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • NR is an emerging wireless communications technology under development.
  • the term “cell” can refer to a coverage area of a Node B (NB) and/or a NB subsystem serving this coverage area, depending on the context in which the term is used.
  • NB Node B
  • BS next generation NodeB
  • AP access point
  • DU distributed unit
  • TRP transmission reception point
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or other types of cells.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG) , UEs for users in the home, etc. ) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • a UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE) , a cellular phone, a smart phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical equipment, a biometric sensor/device, a wearable device such as a smart watch, smart clothing, smart glasses, a smart wrist band, smart jewelry (e.g., a smart ring, a smart bracelet, etc.
  • CPE Customer Premises Equipment
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC machine-type communication
  • eMTC evolved MTC
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that may communicate with a BS, another device (e.g., remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • a network e.g., a wide area network such as Internet or a cellular network
  • Some UEs may be considered Internet-of-Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.
  • IoT Internet-of-Things
  • NB-IoT narrowband IoT
  • a scheduling entity (e.g., a BS) allocates resources for communication among some or all devices and equipment within its service area or cell.
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
  • Base stations are not the only entities that may function as a scheduling entity.
  • a UE may function as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs) , and the other UEs may utilize the resources scheduled by the UE for wireless communication.
  • a UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network.
  • P2P peer-to-peer
  • UEs may communicate directly with one another in addition to communicating with a scheduling entity.
  • the methods disclosed herein comprise one or more steps or actions for achieving the methods.
  • the method steps and/or actions may be interchanged with one another without departing from the scope of the claims.
  • the order and/or use of specific steps and/or actions may be modified without departing from the scope of the claims.
  • a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .
  • determining encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure) , ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information) , accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.
  • the various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions.
  • the means may include various hardware and/or software component (s) and/or module (s) , including, but not limited to a circuit, an application specific integrated circuit (ASIC) , or processor.
  • ASIC application specific integrated circuit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • PLD programmable logic device
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • an example hardware configuration may comprise a processing system in a wireless node.
  • the processing system may be implemented with a bus architecture.
  • the bus may include any number of interconnecting buses and bridges depending on the specific application of the processing system and the overall design constraints.
  • the bus may link together various circuits including a processor, machine-readable media, and a bus interface.
  • the bus interface may be used to connect a network adapter, among other things, to the processing system via the bus.
  • the network adapter may be used to implement the signal processing functions of the PHY layer.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • the bus may also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further.
  • the processor may be implemented with one or more general-purpose and/or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how best to implement the described functionality for the processing system depending on the particular application and the overall design constraints imposed on the overall system.
  • the functions may be stored or transmitted over as one or more instructions or code on a computer readable medium.
  • Software shall be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • the processor may be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage media.
  • a computer-readable storage medium may be coupled to a processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor.
  • the machine-readable media may include a transmission line, a carrier wave modulated by data, and/or a computer readable storage medium with instructions stored thereon separate from the wireless node, all of which may be accessed by the processor through the bus interface.
  • the machine-readable media, or any portion thereof may be integrated into the processor, such as the case may be with cache and/or general register files.
  • machine-readable storage media may include, by way of example, RAM (Random Access Memory) , flash memory, ROM (Read Only Memory) , PROM (Programmable Read-Only Memory) , EPROM (Erasable Programmable Read-Only Memory) , EEPROM (Electrically Erasable Programmable Read-Only Memory) , registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • PROM Programmable Read-Only Memory
  • EPROM Erasable Programmable Read-Only Memory
  • EEPROM Electrical Erasable Programmable Read-Only Memory
  • registers magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • the machine-readable media may be embodied in a computer-program product.
  • a software module may comprise a single instruction, or many instructions, and may be distributed over several different code segments, among different programs, and across multiple storage media.
  • the computer-readable media may comprise a number of software modules.
  • the software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions.
  • the software modules may include a transmission module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices.
  • a software module may be loaded into RAM from a hard drive when a triggering event occurs.
  • the processor may load some of the instructions into cache to increase access speed.
  • One or more cache lines may then be loaded into a general register file for execution by the processor.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared (IR) , radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc include compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers.
  • computer-readable media may comprise non-transitory computer-readable media (e.g., tangible media) .
  • computer-readable media may comprise transitory computer-readable media (e.g., a signal) . Combinations of the above should also be included within the scope of computer-readable media.
  • certain aspects may comprise a computer program product for performing the operations presented herein.
  • a computer program product may comprise a computer-readable medium having instructions stored (and/or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein, for example, instructions for performing the operations described herein and illustrated in FIGs. 4-5.
  • modules and/or other appropriate means for performing the methods and techniques described herein can be downloaded and/or otherwise obtained by a user terminal and/or base station as applicable.
  • a user terminal and/or base station can be coupled to a server to facilitate the transfer of means for performing the methods described herein.
  • various methods described herein can be provided via storage means (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc. ) , such that a user terminal and/or base station can obtain the various methods upon coupling or providing the storage means to the device.
  • storage means e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc.
  • CD compact disc
  • floppy disk etc.
  • any other suitable technique for providing the methods and techniques described herein to a device can be utilized.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Certains aspects de la présente divulgation fournissent des techniques d'opérations d'accès aléatoire multiples. Un procédé qui peut être mis en œuvre par un équipement utilisateur (UE) consiste à déterminer qu'une première procédure d'accès aléatoire est déclenchée tandis qu'une seconde procédure d'accès aléatoire est en cours, la première procédure d'accès aléatoire et la seconde procédure d'accès aléatoire étant associées à différents types de résolution de contention, générer un message d'accès aléatoire comportant un canal de commande commun (CCCH) et un élément de commande (CE) de commande d'accès au support (MAC) d'identifiant temporaire de réseau radio cellulaire (C-RNTI), sur la base de la détermination, et transmettre le message d'accès aléatoire à la station de base.
PCT/CN2020/095087 2020-06-09 2020-06-09 Techniques d'amélioration de performance d'accès aléatoire WO2021248306A1 (fr)

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Citations (2)

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CN108235446A (zh) * 2016-12-22 2018-06-29 夏普株式会社 用户设备和相关方法
US20200107370A1 (en) * 2018-09-27 2020-04-02 FG Innovation Company Limited Method and apparatus for random access

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CN108235446A (zh) * 2016-12-22 2018-06-29 夏普株式会社 用户设备和相关方法
US20200107370A1 (en) * 2018-09-27 2020-04-02 FG Innovation Company Limited Method and apparatus for random access

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