WO2023201740A1 - Procédé et appareil de reprise après défaillance de faisceau - Google Patents

Procédé et appareil de reprise après défaillance de faisceau Download PDF

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Publication number
WO2023201740A1
WO2023201740A1 PCT/CN2022/088613 CN2022088613W WO2023201740A1 WO 2023201740 A1 WO2023201740 A1 WO 2023201740A1 CN 2022088613 W CN2022088613 W CN 2022088613W WO 2023201740 A1 WO2023201740 A1 WO 2023201740A1
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WO
WIPO (PCT)
Prior art keywords
beam failure
bfr
terminal device
random access
access procedure
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PCT/CN2022/088613
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English (en)
Inventor
Samuli Heikki TURTINEN
Timo Koskela
Chunli Wu
Original Assignee
Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to PCT/CN2022/088613 priority Critical patent/WO2023201740A1/fr
Publication of WO2023201740A1 publication Critical patent/WO2023201740A1/fr

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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H04B7/06952—Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping
    • H04B7/06964—Re-selection of one or more beams after beam failure

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to a method, device, apparatus and computer readable storage medium for Beam Failure Recovery (BFR) .
  • BFR Beam Failure Recovery
  • terminal devices may be connected to a serving cell via multiple transmit-receive points (multi-TRP) in the serving cell, to improve the communication capacity, robustness and configuration flexibility of the serving cell.
  • multi-TRP transmit-receive points
  • a terminal device is served by multiple TRPs each configured with a Beam Failure Detection (BFD) -Reference Signal (RS) set associated with beams for the terminal device.
  • BFD-RS sets are configured for fast beam failure detection.
  • a beam failure recovery may be triggered when a beam failure associated with a BFD-RS set is detected.
  • beam failures associated with all sets of BFD-RS of the TRPs occur concurrently, it might require initiating a random access procedure to perform beam failure recovery.
  • example embodiments of the present disclosure provide a solution for beam failure recovery in spell.
  • a terminal device may comprise at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the terminal device to initiate a random access procedure for beam failure recovery, BFR, for a first beam failure of a first set of beam failure detection reference signals, BFD RS, and the second beam failure of a second set of BFD RS, wherein a first BFR for the first beam failure was already triggered before the second beam failure; receive a response to the first BFR for the first beam failure, wherein the response indicates a successful completion of the first BFR for the first beam failure; and stop the random access procedure upon receipt of the response to the first BFR for the first beam failure.
  • BFR beam failure recovery
  • a terminal device may comprise at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the terminal device to initiate a random access procedure for beam failure recovery, BFR, for the first beam failure of a first set of beam failure detection reference signals, BFD RS, and the second beam failure of a second set of BFD RS, wherein a first BFR for the first beam failure was already triggered before the second beam failure; and include BFR information for both the first beam failure and the second beam failure in the message A (MsgA) or message 3 (Msg3) in the random access procedure.
  • BFR beam failure recovery
  • MsgA message A
  • Msg3 message 3
  • the method may comprise initiating a random access procedure for beam failure recovery, BFR, for a first beam failure of a first set of beam failure detection reference signals, BFD RS, and the second beam failure of a second set of BFD RS, wherein a first BFR for the first beam failure was already triggered before the second beam failure; receiving a response to the first BFR for the first beam failure , wherein the response indicates a successful completion of the first BFR for the first beam failure; and stopping the random access procedure upon receipt of the response to the first BFR for the first beam failure.
  • BFR beam failure recovery
  • the method may comprise initiating a random access procedure for beam failure recovery, BFR, for the first beam failure of a first set of beam failure detection reference signals, BFD RS, and the second beam failure of a second set of BFD RS, wherein a first BFR for the first beam failure was already triggered before the second beam failure; and including BFR information for both the first beam failure and the second beam failure in the message A (MsgA) or message 3 (Msg3) in the random access procedure.
  • BFR random access procedure for beam failure recovery
  • BFD RS beam failure detection reference signals
  • Msg3 message 3
  • the apparatus may comprise means for initiating a random access procedure for beam failure recovery, BFR, for a first beam failure of a first set of beam failure detection reference signals, BFD RS, and the second beam failure of a second set of BFD RS, wherein a first BFR for the first beam failure was already triggered before the second beam failure; means for receiving a response to the first BFR for the first beam failure, wherein the response indicates a successful completion of the first BFR for the first beam failure; and means for stopping the random access procedure upon receipt of the response to the first BFR for the first beam failure.
  • the apparatus may comprise means for initiating a random access procedure for beam failure recovery, BFR, for the first beam failure of a first set of beam failure detection reference signals, BFD RS, and the second beam failure of a second set of BFD RS, wherein a first BFR for the first beam failure was already triggered before the second beam failure; and means for including BFR information for both the first beam failure and the second beam failure in the message A (MsgA) or message 3 (Msg3) in the random access procedure.
  • BFR random access procedure for beam failure recovery
  • BFD RS beam failure detection reference signals
  • Msg3 message 3
  • a non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method according to the above third to fourth aspect.
  • Fig. 1 illustrates an example communication network in which embodiments of the present disclosure may be implemented
  • Fig. 2 illustrates a flowchart of an example method implemented at a terminal device according to some example embodiments of the present disclosure
  • Fig. 3 illustrates a flowchart of an example method implemented at a terminal device according to some example embodiments of the present disclosure
  • Fig. 4a illustrates an example of Enhanced BFR and Truncated Enhanced BFR MAC CE with one octet Ci field
  • Fig. 4b illustrates an example of Enhanced BFR and Truncated Enhanced BFR MAC CE with four octet Ci field
  • Fig. 5 illustrates a simplified block diagram of an apparatus that is suitable for implementing embodiments of the present disclosure.
  • Fig. 6 illustrates a block diagram of an example computer readable medium in accordance with some embodiments of the present disclosure.
  • references in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • first and second etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments.
  • the term “and/or” includes any and all combinations of one or more of the listed terms.
  • circuitry may refer to one or more or all of the following:
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • the term “communication network” refers to a network following any suitable communication standards, such as Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Internet of Things (NB-IoT) and so on.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • NB-IoT Narrow Band Internet of Things
  • Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system.
  • the term “network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom.
  • the network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, a low power node such as a femto, a pico, and so forth, depending on the applied terminology and technology.
  • BS base station
  • AP access point
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • NR NB also referred to as a gNB
  • RRU Remote Radio Unit
  • RH radio header
  • terminal device refers to any end device that may be capable of wireless communication.
  • a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) .
  • UE user equipment
  • SS Subscriber Station
  • MS Mobile Station
  • AT Access Terminal
  • the terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) , an Internet of Things (loT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (e.g., remote surgery) , an industrial device and applications (e.g., a robot and/or other wireless devices operating in an industrial and/or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and/
  • TRP refers to a transmit-receive point having an antenna array (with one or more antenna elements) at the network side located at a specific geographical location, which may be used for transmitting and receiving signals to/from the terminal device.
  • a TRP may refer to Macro Cell, micro cell, an RRH, a relay, a femto node, a pico node, etc.
  • a TRP may be configured with a BFD-RS set to be detected by the terminal device, the BFD-RS set is associated with beam (s) available for the terminal device and thus the terminal device may perform beam failure detection by means of the BFD-RS set. Additionally, the TRP may be further configured with a set of candidate beams corresponding to respective BFD-RS sets.
  • the term “multi-TRP” may refer to that the terminal device is served by multiple TRPs and thus configured with a plurality of BFD-RS sets and/or a plurality of sets of candidate beams for multiple TRPs.
  • the term “multi-TRP” may also mean the TRPs serving one or more terminal devices belong to a same cell.
  • a terminal device may communicate with a serving cell via multiple TRPs.
  • the serving cell may be a Primary Cell (PCell) or a Primary Secondary Cell (PSCell) , and PCell and PSCell may be refereed as Special Cell (SpCell) herein after.
  • PCell Primary Cell
  • PSCell Primary Secondary Cell
  • SpCell Special Cell
  • a terminal device may connect to the network via the two TRPs.
  • the two TRPs provide beams sets for the terminal device.
  • the TRPs transmit sets of reference signals (TS) for beam failure detection (BFD) associated with the beam sets to the terminal device.
  • the sets of BFD RS are used to detect the beam failures.
  • the terminal device may continue the communication with the network via another TRP and report the beam failure associated with the one TRP to the network.
  • both beam failure associated with two set of reference signals occurs concurrently (or occurs one after another)
  • the terminal device may initiate a random access procedure to ensure that the communications between the terminal and network can be maintain.
  • a random access procedure is triggered or initiated but a response to the previously reported beam failure is received thereafter.
  • a first beam failure of a first set of reference signal is reported to the network, but the response to the first beam failure is not received when the second beam failure of a second set of reference signal is detected.
  • the detection of the second beam failure will trigger the random access procedure but thereafter the response to the first beam failure may be received during the random access procedure.
  • Example embodiments of the present disclosure provide a solution of beam failure recovery.
  • the terminal device if a terminal device detects beams failures of two sets of BDF RS, the terminal device initiates a random access procedure for BFR for a first beam failure of a first set of BFD RS and/or the second beam failure of a second set of BFD RS during the random access procedure.
  • the terminal device may stop the random access procedure upon receipt of the response of the first BFR for the first beam failure. As such, unnecessary random access procedure can be avoided and UE power can be saved.
  • the terminal device may stop or continue the random access procedure, dependent on different stages of the random access procedure. Additionally or alternatively, the terminal device may include BFR information for both the first beam and the second beam in MsgA or Msg3 in the random access procedure. Additionally, the terminal device may further determine whether to include BFR information for both the first beam and the second beam in MsgA or Msg3 dependent on status of the first beam failure recovery and/or status of the random access procedure.
  • a network device will receive clear information about the beam failure situation in the terminal device, and a specification in terms of how the Enhanced (Truncated) BFR MAC CE is encoded for SpCell will be clear when both BFD-RS sets are failure. Therefore, the system efficiency can be improved.
  • Example embodiments of the present disclosure for determination of concurrent beam failure will be described below with reference to FIGS. 1-6.
  • FIG. 1 illustrates an example environment 100 in which example embodiments of the present disclosure can be implemented.
  • the environment 100 which may be a part of a communication network, comprises a serving cell, such as Spcell 101, a first TRP 105, a second TRP 110, a terminal device 120 as well as a network device 130. It is to be understood that the number of TRPs and terminal devices shown in the environment 100 only for the purpose of illustration, but without any limitation to the scope of the present disclosure. In some embodiments, the environment 100 may comprise a further TRP serving the terminal device 120 and/or another terminal device.
  • the terminal device 120 may communicate with the Spcell 101 provided by the network device 130 via the TRP 105 (also referred as “a first TRP 105” in the following) and the TRP 110 (also referred as “a second TRP 110” in the following) .
  • the terminal device 120 may communicate with the Spcell 101 via a beam 131-1/131-2/131-3 (collectively referred to as “first beam set 131” ) provided by the first TRP 105 and a beam 141-1/141-2/141-3 (collectively referred to as “second beam set 141” ) provided by the second TRP 110.
  • each of the sets of reference signals comprises reference signal associated with individual beam of this set of reference signals, for example, the first set of reference signals comprises one or more reference signals associated with one or more of the beams 131-1, 131-2 and 131-3, respectively.
  • the reference signal may be Beam Failure Detection (BFD) -Reference Signal (RS) . Therefore, the set of reference signals (e.g., the first or the second set of reference signals) may be a set of BFD-RS. In some embodiments, the first set of reference signals and second set of reference signals are associated with the Spcell 101.
  • BFD Beam Failure Detection
  • RS Reference Signal
  • a reference signal for BFD can be any suitable references signals.
  • the reference signal may be a Synchronization Signal Block (SSB) .
  • the reference signal may be a Channel State Information Reference Signal (CSI-RS) .
  • SSB Synchronization Signal Block
  • CSI-RS Channel State Information Reference Signal
  • a set of reference signals may comprise one or more reference signals.
  • the terminal device 120 may detect references signals in the first set of reference signals to determine the occurrence of a beam failure for the first TRP 105 and may detect references signals in the second set of reference signals to determine the occurrence of a beam failure for the second TRP 110.
  • the terminal device 120 may also communicate with the Spcell 101 via more than two TRPs.
  • a further beam set is provided by a further TRP, in addition to the first and second TRPs 105 and 110.
  • the further TRP also transmits a set of reference signals associated with the further beam set.
  • the communications in the environment 100 may follow any suitable communication standards or protocols, which are already in existence or to be developed in the future, such as Universal Mobile Telecommunications System (UMTS) , long term evolution (LTE) , LTE-Advanced (LTE-A) , the fifth generation (5G) New Radio (NR) , Wireless Fidelity (Wi-Fi) and Worldwide Interoperability for Microwave Access (WiMAX) standards, and employs any suitable communication technologies, including, for example, Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiplexing (OFDM) , time division multiplexing (TDM) , frequency division multiplexing (FDM) , code division multiplexing (CDM) , Bluetooth, ZigBee, and machine type communication (MTC) , enhanced mobile broadband (eMBB) , massive machine type communication (mMTC) , ultra-reliable low latency communication (URLLC) , Carrier Aggregation (CA) , Dual Connection (DC) , and
  • FIG. 2 illustrates a flowchart of an example method implemented at a terminal device 120 in accordance with some embodiments of the present disclosure. For purpose of discussion, the flowchart 200 will be described with reference to FIG. 1.
  • a SpCell is configured with two sets of BFD RS.
  • the set of BFD-RS corresponding to the first TRP 105 may be referred to as the first set of BFD-RS
  • the set of BFD-RS corresponding to the second TRP 110 may be referred to as the second set of BFD-RS.
  • the beam failure corresponding to the first set of BFD-RS may be referred to as the first beam failure
  • the beam failure corresponding to the second set of BFD-RS may be referred to as the second beam failure.
  • the terminal device 120 initiates a random access procedure for BFR for a first beam failure of a first set of BFD RS and/or the second beam failure of a second set of BFD RS, wherein a first BFR for the first beam failure was already triggered before the second beam failure.
  • the random access procedure may be triggered when the second beam failure is further detected after the first beam failure was already indicated to the network device but not successfully completed.
  • BFR information of the first BFR for the first beam failure may be carried by Enhanced BFR MAC CE, or Truncated Enhanced BFR MAC CE which contains BFR information for the first set of BFD-RS of e.g. a special Cell, SpCell.
  • the Enhanced BFR MAC CE and Truncated Enhanced BFR MAC CE are identified by a MAC sub-header with extended Logical Channel ID, eLCID.
  • the MAC CE may further comprise a plurality of fields corresponding different cells. Fields associated with the SpCell 101 may be used to carry the BFR information.
  • Fig. 4a illustrates an example of Enhanced BFR and Truncated Enhanced BFR MAC CE with one octet Ci field
  • Fig. 4b illustrates another example of Enhanced BFR and Truncated Enhanced BFR MAC CE with four octet Ci field.
  • the terminal device When the terminal device is configured with a number of cells less not more than 8, it may use the format illustrated in Fig. 4a; and if the number of cells is higher than 8, it may use the format illustrated in Fig. 4b.
  • the Enhanced BFR MAC CE and Truncated Enhanced BFR MAC CE have a variable size. They include a SP field, Ci bitmap (single octet or four octets) , Sj bitmap (0 to 4 octets) , and beam failure recovery information i.e. octets containing candidate beam availability indication (AC) for BFD-RS set (s) of SpCell configured with two BFD-RS sets, and in ascending order based on ServCellIndex.
  • Ci bitmap single octet or four octets
  • Sj bitmap (0 to 4 octets)
  • beam failure recovery information i.e. octets containing candidate beam availability indication (AC) for BFD-RS set (s) of SpCell configured with two BFD-RS sets, and in ascending order based on ServCellIndex.
  • the SP field of BFR MAC CE indicates beam failure detection for the SpCell of this MAC entity and the presence of octet (s) and may contain the AC field if the SpCell is configured with multiple BFD-RS sets.
  • the Ci field (such as, C 1 -C 7 bits or C 1 to C 31 bits) indicates the index of the failed Cell, and contains AC field whether a candidate beam is available and the candidate beam index (such as, Candidate RS ID field, if any) in the canditebeam-rs-list (such as, a list of candidates beam indexes that are either SSB and/or CSI-RS indexes) .
  • the Sk field of BFR MAC CE corresponds to the kth Serving Cell for which SP/Ci field is set to 1 and is configured with two BFD-RS sets. This field indicates whether beam failure is detected for one or both BFD-RS sets and presence of one or two octets containing the AC field of the Serving Cell.
  • the terminal device may indicate candidate beams are available in AC filed and indicates candidate beams or Enhanced BFR MAC CE and Truncated Enhanced BFR MAC CE, one octet Sk bitmap is included if the total number of Serving Cells configured with two BFD-RS sets for which SP/Ci field set to 1 is greater than 0 and less than 9, as shown in Fig 4a; a four octets Sk bitmap is included if the total number of Serving Cells configured with two BFD-RS sets for which SP/Ci field set to 1 is greater than 24, as shown in Fig 4b; Sk bitmap is not included if the total number of Serving Cells configured with two BFD-RS sets for which SP/Ci field is set to 1 is zero.
  • the terminal device 120 receives a response of the first BFR for the first beam failure, wherein the response indicates a successful completion of the first BFR for the first beam failure.
  • the network device receives the report of the first beam failure and provides a response to indicate the terminal device the first BFR is successfully completed.
  • the response to the first BFR for the first beam failure may comprise a Physical downlink control channel, PDCCH, information addressed to Cell-Radio Network Temporary Identity, C-RNTI.
  • PDCCH Physical downlink control channel
  • the PDCCH information may indicate an uplink grant for a new transmission for a Hybrid Automatic Repeat request, HARQ, process used for the first transmission of the Enhanced BFR MAC CE or Truncated Enhanced BFR MAC CE.
  • HARQ Hybrid Automatic Repeat request
  • the terminal device 120 stops the random access procedure upon receipt of the response to the BFR for the first beam failure.
  • the terminal device 120 may trigger a second BFR for the second beam failure after stopping the random access procedure, wherein BFR information of the second BFR includes an enhanced BFR MAC CE, or a truncated enhanced BFR MAC CE which contains BFR information for the second beam failure
  • BFR information of the second BFR includes an enhanced BFR MAC CE, or a truncated enhanced BFR MAC CE which contains BFR information for the second beam failure
  • the second BFR triggered for the second failed BFD-RS set remains pending and will be transmitted in subsequent uplink transmission following the procedure of only one set failure case, i.e. the BFR for the second beam failure can be transmitted on a beam associated with the first set of BFD RS
  • the terminal device 120 trigger a scheduling request for the second BFR for the second beam failure after stopping the random access procedure.
  • the random access procedure can be stopped unconditionally upon receipt of the response to the BFR for the first beam failure.
  • the terminal device may further determine whether to stop the random access procedure based on the status or stages of the random access procedure.
  • the terminal device 120 may further determine whether MsgA or Msg3 for carrying the beam failure recovery information in the random access procedure has been built or not upon receipt of the response to the first BFR for the first beam failure.
  • the terminal device may stop the random access procedure when the MsgA or Msg3 has not been built. On the other hand, when the MsgA or Msg3 has been built, the terminal device may continue the random access procedure.
  • the terminal device 120 may further determine whether MsgA or Msg3 for carrying the beam failure recovery information in the random access procedure has been transmitted or not upon receipt of the response to the first BFR for the first beam failure.
  • the terminal device may stop the random access procedure when the MsgA or Msg3 has not been transmitted. On the other hand, when the MsgA or Msg3 has been transmitted, the terminal device may continue the random access procedure.
  • the terminal device 120 may stop the random access procedure when a response to the first BFR for the first beam failure is received, after message A (MsgA) or message 3 (Msg3) for carrying BFR information in the random access procedure has been built or transmitted.
  • message A MsgA
  • Msg3 message 3
  • the terminal device 120 may include BFR information for both the first beam failure and the second beam failure in enhanced BFR MAC CE, or Truncated enhanced BFR MAC CE within MsgA or Msg3 in the random access procedure when building the Msg A or Msg3 if no response to the first BFR for the first beam failure is received.
  • the terminal device 120 may trigger an Enhanced BFR MAC CE or Truncated Enhanced BFR MAC CE which contains BFR information for the first set of BFD-RS for the first beam failure associated with the first set of BFD RS.
  • the terminal device 120 may include, when building the MsgA and Msg3, enhanced BFR MAC CE or Truncated Enhanced BFR MAC CE for the first beam failure within the MsgA and Msg3, in addition to BFR information for the second beam failure.
  • FIG. 3 illustrates a flowchart of another example method implemented at a terminal device 120 in accordance with some embodiments of the present disclosure. For purpose of discussion, the flowchart 300 will be described with reference to FIG. 1.
  • the terminal device 120 may initiate a random access procedure for BFR for the first beam failure of a first set of beam failure detection reference signals, BFD RS, and/or the second beam failure of a second set of BFD RS, wherein a first BFR for the first beam failure was already triggered before the second beam failure.
  • the random access procedure may be triggered when the second beam failure is further detected after the first beam failure was already indicated to the network device but not successfully completed.
  • the terminal device 120 may include BFR information for both the first beam failure and the second beam failure in enhanced BFR MAC CE, or Truncated enhanced BFR MAC CE within the MsgA or Msg3 in the random access procedure.
  • BFR information can be carried within fields associated with SPcell in the Enhanced BFR MAC CE or Truncated Enhanced BFR MAC CE.
  • the terminal device 120 may trigger an Enhanced BFR MAC CE or Truncated Enhanced BFR MAC CE which contains BFR information for the first set of BFD-RS for the first beam failure.
  • the terminal device 120 may include when building the MsgA and Msg3, enhanced BFR MAC CE or Truncated Enhanced BFR MAC CE for the first beam failure within the MsgA and Msg3, in addition to BFR information for the second beam failure.
  • BFR information for the first beam failure and/or the second beam failure can be included in MsgA or MSG3 unconditionally when building the MsgA or MSG3.
  • the terminal device may determine whether to include BFR information for the first beam failure or the second beam failure based on status of the first beam failure recovery and/or status of the random access procedure.
  • the terminal device 120 may determine whether BFR of the first beam and the second beam are successfully completed, before building of the MsgA or Msg3. when neither of the first beam and the second beam is successfully completed, the terminal device 120 may include BFR information for both the first beam and the second beam in MSG A or MSG3 in the random access procedure.
  • the terminal device 120 may include the BFR information for both the first beam failure and the second beam failure in the MSGA or MSG3 in the random access procedure when any BFR for the first beam failure or the second beam failure is not successfully completed.
  • the terminal device 120 may trigger second Enhanced BFR Media Access Control Element, MAC CE, or Truncated Enhanced BFR MAC CE which contains BFR information for the first beam failure of the first set of BFD RS to include in the message A (MsgA) or message 3 (Msg3) before building of the MsgA or Msg3.
  • MAC CE Enhanced BFR Media Access Control Control Element
  • TrC Truncated Enhanced BFR MAC CE which contains BFR information for the first beam failure of the first set of BFD RS to include in the message A (MsgA) or message 3 (Msg3) before building of the MsgA or Msg3.
  • the terminal device 120 may include the BFR information for both the first beam failure and the second beam failure in enhanced BFR MAC CE, or Truncated enhanced BFR MAC CE within the MSG A or MSG3 in the random access procedure when any BFR for the first beam failure or the second beam failure is successfully completed but no suitable candidate beam was indicated.
  • the terminal device 120 may include the BFR information for both the first beam failure and the second beam failure in enhanced BFR MAC CE, or Truncated enhanced BFR MAC CE within the MSG A or MSG3 in the random access procedure when the first BFR for the first beam failure was provided but is not acknowledged and no suitable candidate beam was indicated.
  • the terminal device 120 may include a BFR information for only the second beam failure in the MsgA or Msg3 in the random access procedure when a response to the first BFR for the first beam failure is already received before building of the MsgA or Msg3, wherein the response indicates a successful completion of the first BFR for the first beam failure.
  • the terminal device 120 may continue the random access procedure regardless of any response to the first BFR for the first beam failure.
  • the terminal device 120 may stop the random access procedure upon receipt of the response to the first BFR for the first beam failure before building or transmitting of the MsgA or Msg3, wherein the response indicates the success completion of the first BFR for the first beam failure.
  • the terminal device 120 may continue the random access procedure upon receipt of the response to the first BFR for the first beam failure after building or transmitting of the MsgA or Msg3, wherein the response indicates the success completion of the first BFR for the first beam failure.
  • the BFR information for both the first beam failure and the second beam failure may be included in enhanced BFR MAC CE, or Truncated enhanced BFR MAC CE within in MsgA or message 3 Msg3 as illustrated in Figs. 4a and 4b.
  • FIG. 5 is a simplified block diagram of a device 500 that is suitable for implementing embodiments of the present disclosure.
  • the device 500 may be provided to implement the communication device, for example the terminal device 120, the network device 130 as shown in Fig. 1.
  • the device 500 may include one or more processors 510, one or more memories 520 coupled to the processor 510, and one or more communication modules 540 coupled to the processor 510.
  • the communication module 540 is for bidirectional communications.
  • the communication module 540 has at least one antenna to facilitate communication.
  • the communication interface may represent any interface that is necessary for communication with other network elements.
  • the processor 510 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 500 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • the memory 520 may include one or more non-volatile memories and one or more volatile memories.
  • the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 524, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and/or optical storage.
  • the volatile memories include, but are not limited to, a random access memory (RAM) 522 and other volatile memories that will not last in the power-down duration.
  • a computer program 530 includes computer executable instructions that are executed by the associated processor 510.
  • the program 530 may be stored in the ROM 524.
  • the processor 510 may perform any suitable actions and processing by loading the program 530 into the RAM 522.
  • the embodiments of the present disclosure may be implemented by means of the program 530 so that the device 500 may perform any process of the disclosure as discussed with reference to Figs. 2 to 4b.
  • the embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
  • the program 530 may be tangibly contained in a computer readable medium which may be included in the device 500 (such as in the memory 520) or other storage devices that are accessible by the device 500.
  • the device 500 may load the program 530 from the computer readable medium to the RAM 522 for execution.
  • the computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like.
  • Fig. 6 shows an example of the computer readable medium 600 in form of CD or DVD.
  • the computer readable medium has the program 530 stored thereon.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the method 200 and 300 as described above with reference to Figs. 2-4b.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, computer readable medium, and the like.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

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

Abstract

Des modes de réalisation de la présente divulgation concernent la résolution de multiples défaillances d'un ensemble de signaux de référence de détection de défaillance de faisceau (BFD-RS). Le procédé mis en œuvre par un dispositif terminal consiste à : initier une procédure d'accès aléatoire pour une reprise après défaillance de faisceau, BFR, pour une première défaillance de faisceau d'un premier ensemble de signaux de référence de détection de défaillance de faisceau, BFD RS, et pour la seconde défaillance de faisceau d'un second ensemble de BFD RS, une première reprise BFR pour la première défaillance de faisceau ayant déjà été déclenchée avant la seconde défaillance de faisceau; recevoir une réponse à la première reprise BFR pour la première défaillance de faisceau, la réponse indiquant une réussite de la première reprise BFR pour la première défaillance de faisceau; arrêter la procédure d'accès aléatoire lors de la réception de la réponse à la première reprise BFR pour la première défaillance de faisceau. Ainsi peut-on éviter une procédure d'accès aléatoire superflue et réaliser une économie d'énergie au niveau du dispositif terminal.
PCT/CN2022/088613 2022-04-22 2022-04-22 Procédé et appareil de reprise après défaillance de faisceau WO2023201740A1 (fr)

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