WO2019134506A1 - 一种波束失败恢复方法、装置及设备 - Google Patents

一种波束失败恢复方法、装置及设备 Download PDF

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Publication number
WO2019134506A1
WO2019134506A1 PCT/CN2018/121852 CN2018121852W WO2019134506A1 WO 2019134506 A1 WO2019134506 A1 WO 2019134506A1 CN 2018121852 W CN2018121852 W CN 2018121852W WO 2019134506 A1 WO2019134506 A1 WO 2019134506A1
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WIPO (PCT)
Prior art keywords
random access
bwp
csi
ssb
failure recovery
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PCT/CN2018/121852
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English (en)
French (fr)
Inventor
谌丽
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电信科学技术研究院有限公司
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Application filed by 电信科学技术研究院有限公司 filed Critical 电信科学技术研究院有限公司
Priority to EP18898972.7A priority Critical patent/EP3739933B1/en
Priority to KR1020207022922A priority patent/KR102348988B1/ko
Priority to US16/960,321 priority patent/US11109247B2/en
Priority to JP2020537627A priority patent/JP7170730B2/ja
Publication of WO2019134506A1 publication Critical patent/WO2019134506A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • 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
    • H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • 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

  • the present invention relates to the field of wireless communication technologies, and in particular, to a beam failure recovery method, apparatus, and device.
  • the cell carrier bandwidth of the network side is less than or equal to the terminal receiving bandwidth of 20 MHz. Therefore, the network side always allocates the total uplink and downlink bandwidth of the cell to the terminal, and the terminal can be in the entire cell. Works on the carrier bandwidth.
  • the network side carrier bandwidth can be as high as 400 MHz, which is much larger than the terminal receiving capability.
  • BWP Band Width Part
  • the concept of Band Width Part is introduced, that is, the large bandwidth on the network side is divided into multiple partial bandwidth BWPs, one or more BWPs are configured to the terminal, and a partially configured BWP is activated to perform uplink and downlink operations for the terminal.
  • the activated downlink BWP is called active DL BWP
  • the activated uplink BWP is called active UL BWP.
  • the inactive BWP cannot perform uplink and downlink signaling and data transmission.
  • each BWP is configured with various functions and resources independently.
  • the base station can configure independent random access resources, scheduling request resources, and physical uplink control channels (Physical Uplink Control) for different BWPs.
  • Physical Uplink Control Physical Uplink Control
  • Channel Physical Uplink Control
  • SRS semi-persistent schedule
  • the terminal and the base station transmit on the determined beam, and the receiving and transmitting beams of the base station and the terminal have a corresponding relationship.
  • the beam failure recovery process needs to be initiated.
  • the process is implemented by random access. Specifically, the terminal selects a specific beam and initiates random access. After the random access succeeds, it is considered that Beam failure recovery is done on the selected beam.
  • the beam failure recovery process is confusing.
  • the base station cannot determine how the terminal performs beam failure recovery and cannot respond in time.
  • the invention provides a beam failure recovery method, device and device, which are used to solve the problem of how to select a reasonable resource to implement beam failure recovery in a plurality of BWP configurations.
  • a beam failure recovery method is provided in the embodiment of the present invention, including:
  • the terminal determines that beam failure recovery is required
  • the terminal initiates random access to perform beam failure recovery BFR on the selected partial bandwidth BWP, wherein no BWP change is performed during the random access procedure.
  • the terminal initiates random access for beam failure recovery on the selected BWP, including:
  • the terminal initiates a random access on the BWP that is activated before the beam fails, and if there is no non-contention random access resource for the BFR on the activated BWP, the contention random access is initiated to perform beam failure recovery; or
  • the terminal initiates random access on the BWP that is activated before the beam fails. If the activated BWP has non-contention random access resources for the BFR, the terminal initiates non-contention random access on the activated BWP to perform beam failure recovery. If there is no non-contention random access resource for the BFR on the activated BWP, change to the default BWP with the non-contention random access resource configuration, initiate random access, and perform beam failure recovery; or
  • the terminal selects a beam beam according to the channel quality on the configured multiple BWPs, and initiates random access on the BWP where the beam is located to perform beam failure recovery.
  • the default BWP with non-contention random access resource configuration is: an initial BWP, or a default BWP, or a specially configured BWP that performs BFR.
  • the terminal selects a beam according to the channel quality on the configured multiple BWPs, including:
  • the beam with the configuration of the non-contention random access resource and the BWP where the BWP is located initiate random access. If all the beams configured with the non-contention random access resource configuration do not meet the channel quality requirements, Then select other beams that meet the channel quality requirements and the BWP in which they are located, and initiate competitive random access.
  • the method further comprises:
  • the terminal Under non-contention random access, the terminal does not receive the PDCCH scheduling command with the C-RNTI in the configured time; or, when the contention is not successfully completed under the contention random access, the random access is re-initiated to perform the BFR.
  • the random access is re-initiated for BFR, including:
  • Change to the specified BWP perform SSB or CSI-RS measurement on the BWP, select an SSB or CSI-RS whose channel quality is higher than the threshold, and re-initiate according to the random access configuration under the corresponding beam of the SSB or CSI-RS Random access, wherein the specified BWP is an initial BWP or a default BWP; or,
  • the terminal Reselecting one SSB and/or CSI-RS and its corresponding beam according to the result of the SSB or CSI-RS measurement on multiple BWPs configured, and re-initiating random according to the random access configuration under the corresponding beam of the SSB or CSI-RS Access, if the SSB and/or CSI-RS are not on the current BWP, the terminal changes to the BWP where the SSB and/or the CSI-RS is located to re-initiate random access.
  • a user terminal is provided in the embodiment of the present invention, including:
  • a processor for reading a program in the memory performing the following process:
  • a transceiver for receiving and transmitting data under the control of a processor, performing the following processes:
  • random access is initiated on the selected BWP for beam failure recovery, including:
  • a random access is initiated on the BWP that is activated before the beam fails, and if there is no non-contention random access resource for the BFR on the activated BWP, the contention random access is initiated to perform beam failure recovery; or
  • a random access is initiated on the BWP that is activated before the beam fails, and if there is a non-contention random access resource for the BFR on the activated BWP, non-contention random access is initiated on the activated BWP, and beam failure recovery is performed; If the non-competitive random access resource for the BFR is not activated, the BWP is changed to the default BWP with the configuration of the non-contention random access resource, and the random access is initiated to perform beam failure recovery; or
  • the beam beam is selected according to the channel quality on the configured multiple BWPs, and random access is initiated on the BWP where the beam is located to perform beam failure recovery.
  • the default BWP with non-contention random access resource configuration is: an initial BWP, or a default BWP, or a specially configured BWP that performs BFR.
  • the beam is selected according to the channel quality on the configured multiple BWPs, including:
  • the beam with the configuration of the non-contention random access resource and the BWP where the BWP is located initiate random access. If all the beams configured with the non-contention random access resource configuration do not meet the channel quality requirements, Then select other beams that meet the channel quality requirements and the BWP in which they are located, and initiate competitive random access.
  • the method further comprises:
  • the PDCCH scheduling command with the C-RNTI is not received within the configured time; or, when the contention resolution is not successfully completed under the contention random access, the random access is re-initiated for BFR.
  • the random access is re-initiated for BFR, including:
  • Change to the specified BWP perform SSB or CSI-RS measurement on the BWP, select an SSB or CSI-RS whose channel quality is higher than the threshold, and re-initiate according to the random access configuration under the corresponding beam of the SSB or CSI-RS Random access, wherein the specified BWP is an initial BWP or a default BWP; or,
  • a computer readable storage medium storing a computer program for performing the above method is provided in an embodiment of the present invention.
  • a beam failure recovery apparatus is provided in the embodiment of the present invention, including:
  • a determining module configured to determine that the terminal needs to perform beam failure recovery
  • the recovery module is configured to initiate random access to perform beam failure recovery BFR on a part of the bandwidth BWP selected by the terminal, where the BWP change is not performed during the random access process.
  • the terminal initiates random access to perform beam failure recovery on the selected BWP, and does not perform BWP change in the random access process. Since the BWP change is not performed in the process, when the terminal configures each BWP, the beam failure recovery process is not confusing.
  • the terminal can select a reasonable BWP and the SSB or CSI-RS on it to initiate a beam failure recovery process. Fast beam recovery can be achieved while minimizing the impact on data transmission.
  • the base station can also determine how the terminal performs beam failure recovery, so that the response can be timely, and the effective transmission of data can be ensured without wasting random access resources.
  • FIG. 1 is a schematic diagram of a process of competing random access in an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a non-contention random access procedure according to an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of an implementation process of a beam failure recovery method according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a user terminal according to an embodiment of the present invention.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • UMTS Universal Mobile Telecommunication System
  • NR New Radio
  • the user equipment includes but is not limited to a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), a mobile phone (Mobile Telephone), a mobile phone (handset). And portable devices, etc., the user equipment can communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment can be a mobile phone (or "cellular"
  • RAN Radio Access Network
  • the user equipment can be a mobile phone (or "cellular"
  • the telephone device, the computer with wireless communication function, etc., the user equipment can also be a mobile device that is portable, pocket-sized, handheld, built-in, or in-vehicle.
  • a base station may refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface.
  • the base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network.
  • IP Internet Protocol
  • the base station can also coordinate attribute management of the air interface.
  • the base station may be a Base Transceiver Station (BTS) in GSM or CDMA, or may be a base station (NodeB) in TD-SCDMA or WCDMA, or may be an evolved base station (eNodeB or eNB or e- in LTE).
  • NodeB, evolutional Node B), or a base station (gNB) in 5G NR the present invention is not limited.
  • the base station can configure multiple BWPs for the terminal, and each function and resource are independently configured on each BWP. For example, the base station may configure independent random access resources, scheduling request resources, PUCCH, SRS, etc. for different BWPs. There will be multiple BWP configurations, how to choose a reasonable resource to achieve beam failure recovery.
  • 3GPP also defines some basic concepts:
  • Initial BWP (initial BWP): For the initially accessed terminal, the initial BWP (initial BWP) can only be used to complete the connection establishment process.
  • the initial BWP includes basic cell broadcast signaling, random access resources, and the like.
  • the default BWP (default BWP):
  • the next-generation base station (gNB) on the network side can configure a default BWP for the connected terminal.
  • the terminal can perform some basic operations on the default BWP, such as maintaining cell connection, performing cell measurement, and initiating. Random access, etc.
  • Configure BWP (configured BWP): The BWP configured on the network side for a single connected terminal. Each BWP is configured with independent parameters, such as PUCCH configuration, SPS configuration, physical random access channel (PRACH) configuration, and beam. Non-competitive access resources used by beam failure recovery (BFR).
  • BFR beam failure recovery
  • Activate BWP In the BWP configured for the terminal on the network side, the terminal can only use the activated BWP for uplink and downlink transmission.
  • the active BWP is divided into active DL BWP and active UL BWP.
  • the base station explicitly changes the active BWP by using a physical layer signaling Downlink Control Indicator (DCI).
  • DCI Downlink Control Indicator
  • a BWP-InactivityTimer hereinafter referred to as a BWP timer
  • the terminal changes from the active BWP to the default BWP after the BWP timer expires.
  • Random access is divided into competitive random access and non-competitive random access. The process is as follows:
  • FIG. 1 is a schematic diagram of a competitive random access procedure.
  • the competitive random access procedure is shown in the figure. It is mainly divided into four steps:
  • the user equipment selects a random access code preamble (random access preamble) and a random access resource PRACH, and sends the selected random access code preamble to the base station on the selected PRACH resource.
  • a specific preamble and/or PRACH resource is reserved for the Msg1-based system message request "Msg1 based SI request”.
  • the base station receives the random access request Msg1, and sends a random access response to the UE.
  • the random access response includes the uplink timing advance, the uplink resource uplink scheduling information (UL grant) allocated for the Msg3, and the temporary cell allocated by the network side.
  • Cell-Radio Network Temporary Identifier C-RNTI.
  • the physical downlink control channel (PDCCH) carrying the Msg2 scheduling message is scrambled by a random access-Radio Network Temporary (RA-RNTI), and the preamble ID is also carried in the Msg2.
  • RA-RNTI and the preamble ID determine that the Msg2 corresponds to the Msg1 transmitted by it.
  • Msg2 only contains the preamble ID information corresponding to Msg1, and there is no other content.
  • the random access procedure ends with the Msg2, that is, if the received Msg2 includes the preamble ID corresponding to the preamble sent by the Msg1, the Msg1-based system message request process is considered complete.
  • the UE sends an uplink transmission on the UL grant specified by the Msg2.
  • the content of the Msg3 uplink transmission is different for different random access reasons. For example, for the initial access, the Msg3 transmits a Radio Resource Control (RRC) connection establishment request.
  • RRC Radio Resource Control
  • Msg4 The contention resolution message, the UE can judge whether the random access is successful according to Msg4. For the initial access UE, after the contention resolution is successful, the temporary C-RNTI is automatically converted into the UE's unique UE identity C-RNTI in the cell.
  • FIG. 2 is a schematic diagram of a non-contention random access procedure.
  • the non-contention random access procedure is shown in the figure, and is mainly divided into three steps:
  • the base station allocates a dedicated preamble for non-contention random access and a PRACH resource used for random access to the UE.
  • Msg1 The UE sends the designated dedicated preamble to the base station on the designated PRACH resource according to the indication of Msg0. After receiving the Msg1, the base station calculates the Timing Advance (TA) according to Msg1.
  • TA Timing Advance
  • Msg2 The base station sends a random access response to the UE.
  • the format of the random access response is the same as that of the contention random access, and the PDCCH scheduling medium access control random access response protocol data unit with the RA-RNTI is used.
  • MAC RAR PDU the MAC RAR PDU includes a Random Access Preamble ID (RAPID), a Timing Alignment Command (TAC), and a subsequent uplink transmission resource allocation UL grant.
  • RAPID Random Access Preamble ID
  • TAC Timing Alignment Command
  • the terminal completes the contention resolution by using the RAPID in the random access response MAC RAR and the preamble code sent by the Msg1.
  • the NR also introduces a new non-contention random access scenario: the beam fails to recover the BFR.
  • the Msg2 is the PDCCH carrying the C-RNTI.
  • the C-RNTI is the same as the C-RNTI of the terminal. The success is successful, and the beam failure recovery is successful.
  • the terminal and the base station transmit on the determined beam, and the receiving and transmitting beams of the base station and the terminal have a corresponding relationship.
  • the beam failure recovery process needs to be initiated.
  • the process is implemented by random access. Specifically, the terminal selects a specific beam and initiates random access. After the random access succeeds, it is considered that Beam failure recovery is done on the selected beam.
  • the network side allocates non-contention access resources (PRACH resources and/or preamble codes) to the plurality of beams, and if the terminal selects non-contention random access resources on the beam, initiates non-contention random access, and the terminal sends the Msg1.
  • PRACH resources and/or preamble codes non-contention access resources
  • the non-contention random access After receiving the C-RNTI scrambled PDCCH command in the configuration time, the non-contention random access is considered successful. If no non-contention random access resources are allocated on the selected beam, the terminal performs beam failure recovery in the contention random access mode. Non-contention random access resources for beam failure recovery are independently allocated on different BWPs. Beam recovery refers to the fact that the terminal re-discovers the beam whose channel quality meets the requirements, which is represented by the terminal selecting a new Synchronization Signal Block (SSB) or channel state information reference signal (CSI). -RS), different SSBs or CSI-RSs correspond to different beams. In the description of the present application, selecting beam is equivalent to selecting SSB or CSI-RS.
  • SSB Synchronization Signal Block
  • CSI channel state information reference signal
  • the network side allocates non-contention random access resources to the terminal for beam failure recovery, but the terminal-activated BWP does not allocate non-contention random access resources, the current mechanism does not specify terminal behavior in this state. This causes the terminal to be confused in the beam failure recovery process when the terminal is configured for each BWP.
  • the base station is not sure how the terminal performs beam failure recovery, and cannot respond in time. When the random access resources are wasted, the effective transmission of data cannot be guaranteed.
  • a solution for performing beam failure recovery is provided to solve the problem of how to select a reasonable resource to implement beam failure recovery in multiple BWP configurations.
  • FIG. 3 is a schematic diagram of an implementation process of a beam failure recovery method, as shown in the figure, which may include:
  • Step 301 The terminal determines that beam failure recovery is required.
  • Step 302 The terminal initiates random access to perform beam failure recovery on the selected BWP, where the BWP change is not performed during the random access process.
  • the terminal initiates random access on the selected BWP to perform beam failure recovery, and does not perform BWP change in the random access process.
  • the terminal initiates random access to perform beam failure recovery on the selected BWP, including the following three methods:
  • the terminal initiates a random access on the BWP activated before the beam fails. If there is no non-contention random access resource for the BFR on the activated BWP, the contending random access is initiated to perform beam failure recovery.
  • the terminal initiates random access on the BWP activated before the beam fails. If there is no non-contention random access resource for the BFR on the activated BWP, the contending random access is initiated to perform beam failure recovery.
  • the terminal initiates random access on the BWP activated before the beam fails. If the activated BWP has non-contention random access resources for BFR, the terminal initiates non-contention random access on the activated BWP, and performs beam failure. Recovery; if there is no non-contention random access resource for BFR on the activated BWP, change to the default BWP with non-contention random access resource configuration, initiate random access, and perform beam failure recovery.
  • the default BWP with non-contention random access resource configuration may be: an initial BWP, or a default BWP, or a specially configured BWP that performs BFR.
  • the terminal determines whether there is a non-contention random access resource for BFR on the BWP activated before the beam failure, and if yes, the terminal initiates non-contention random access on the activated BWP, and performs beam failure recovery; if not, the change is performed.
  • the default BWP with non-contention random access resource configuration initiate random access and perform beam failure recovery.
  • the default BWP with non-contention random access resource configuration may be an initial BWP, or a default BWP, or a dedicated configuration.
  • the BWP that performs BFR may be an initial BWP, or a default BWP, or a dedicated configuration.
  • the terminal selects a beam according to the channel quality on the configured multiple BWPs, and initiates random access on the BWP where the beam is located to perform beam failure recovery.
  • the terminal selects a beam according to the channel quality on the configured multiple BWPs, and the method may include:
  • the beam with the configuration of the non-contention random access resource and the BWP where the BWP is located initiate random access. If all the beams configured with the non-contention random access resource configuration do not meet the channel quality requirements, Then select other beams that meet the channel quality requirements and the BWP in which they are located, and initiate competitive random access.
  • the terminal selects a beam with a good channel quality on the configured multiple BWPs, and initiates random access on the BWP corresponding to the beam to perform beam failure recovery.
  • the way in which the terminal selects a beam with a sufficiently good channel quality can be:
  • the other beams required and the BWP in which they are located initiate random access.
  • a random access failure means that, under non-contention random access, the terminal does not receive the PDCCH scheduling command with C-RNTI within the configured time, or does not successfully complete the contention resolution under the random access. For the case after the terminal fails after a random access.
  • the “configuration time” in the PDCCH scheduling command with the C-RNTI received by the terminal in the non-contention random access is the specified time for receiving the random access response of the base station, and is generally a random access response receiving window. long.
  • it may further include:
  • the terminal Under non-contention random access, the terminal does not receive the PDCCH scheduling command with the C-RNTI in the configured time; or, when the contention is not successfully completed under the contention random access, the random access is re-initiated to perform the BFR.
  • the terminal may re-initiate random access for BFR in the following manners:
  • the terminal uses the last random access BWP and beam (represented as SSB or CSI-RS) and the random access resource to re-initiate random access until the maximum random access is reached.
  • the terminal After a random access failure, the terminal performs beam quality measurement on the current BWP, reselects an SSB or CSI-RS, and re-establishes the current BWP according to the random access configuration under the corresponding beam of the SSB or CSI-RS. Initiate random access.
  • the terminal changes to a designated BWP, performs SSB or CSI-RS measurement on the BWP, selects an SSB or CSI-RS whose channel quality is higher than a threshold, and according to the SSB or CSI.
  • the random access configuration under the corresponding beam of the RS re-initiates the random, and the designated BWP is the initial BWP or the default BWP.
  • the terminal reselects one SSB and/or CSI-RS and its corresponding beam according to the result of the SSB or CSI-RS measurement on multiple BWPs, and according to the SSB or the CSI-RS.
  • the random access configuration in the corresponding beam re-initiates random access. If the SSB and/or CSI-RS are not on the current BWP, the terminal needs to change to the BWP where the SSB and/or CSI-RS is located.
  • the following is an example.
  • the following embodiment only describes the behavior of the terminal side, and the base station side performs a random access procedure corresponding to the terminal side process.
  • the terminal only performs BFR on the currently activated BWP.
  • Step 1 The terminal detects that the beam fails.
  • Step 2 The terminal performs SSB and/or CSI-RS measurement only on the BWP activated before the discovery of the beam failure;
  • Step 3 When detecting the SSB and/or CSI-RS that meet the channel quality requirements, initiate random access on its corresponding beam, including:
  • the contention random access is initiated, and the BFR is performed.
  • the terminal does not perform BWP changes.
  • the terminal performs BFR on the specified BWP that can perform BFR.
  • Step 1 The terminal detects that the beam fails.
  • Step 2 The terminal performs SSB and/or CSI-RS measurement on the BWP activated before the discovery of the beam failure;
  • Step 3 If no beam that satisfies the channel quality requirement or a beam that satisfies the channel quality requirement is not configured with the non-contention random access resource for the BFR, the terminal changes to the default BWP with the non-contention random access resource configuration.
  • the BWP can be an initial BWP, or a default BWP, or a specially configured BWP that performs BFR;
  • Step 4 Perform SSB and/or CSI-RS measurements on the changed BWP;
  • Step 5 When detecting the SSB and/or CSI-RS that meet the channel quality requirements, initiate random access on its corresponding beam, including:
  • the terminal performs BFR by measuring the selection BWP on all configured BWPs.
  • Step 1 The terminal detects that the beam fails.
  • Step 2 The terminal performs SSB and/or CSI-RS measurement on multiple BWPs configured.
  • Step 3 The terminal filters all the measurement results, selects the SSB and/or CSI-RS that meet the channel quality requirements and the corresponding beam, and preferentially selects the beam configured with the non-contention random access resource. If there is no such beam, Select a beam that is not configured with non-contention random access resources;
  • Step 4 The terminal changes to the BWP where the selected SSB and/or the CSI-RS is located, and initiates random access on the beam, including:
  • the terminal initiates non-contention random access and performs BFR;
  • the terminal If the beam is not configured with a non-contention random access resource, the terminal initiates a contention random access and performs BFR.
  • the terminal after a random access failure, the terminal re-initiates random access for BFR on the beam of the current BWP.
  • Step 1 The terminal initiates random access to perform BFR, but the random access fails.
  • Step 2 The terminal re-initiates random access on the BWP and beam (SSB or CSI-RS) that initiated the random access last time. If the last time is non-contention random access, the current corresponding to the SSB or CSI-RS Selecting a non-contention random access resource to initiate non-contention random access in the non-contention random access resource; if the last time is the contention random access, the competition random access is initiated on the beam corresponding to the SSB or the CSI-RS.
  • the terminal reselects the beam at the current BWP to initiate random access for BFR.
  • Step 1 The terminal initiates random access to perform BFR, but the random access fails.
  • Step 2 The terminal reselects the SSB or CSI-RS that meets the channel quality requirement on the BWP that initiated the random access, and preferentially selects the SSB or CSI-RS configured with the non-contention random access resource, and re-initiates the random access.
  • Conduct BFR The terminal reselects the SSB or CSI-RS that meets the channel quality requirement on the BWP that initiated the random access, and preferentially selects the SSB or CSI-RS configured with the non-contention random access resource, and re-initiates the random access.
  • the terminal changes to the specified BWP to initiate random access.
  • Step 1 The terminal initiates random access to perform BFR, but the random access fails.
  • Step 2 The terminal changes to the specified BWP, and the designated BWP is an initial BWP or a default BWP;
  • Step 3 The terminal performs SSB or CSI-RS measurement on the BWP, selects an SSB or a CSI-RS whose channel quality is higher than a threshold, and re-initiates random access according to the random access configuration corresponding to the SSB or the CSI-RS.
  • the terminal selects the SSB or the CSI-RS to initiate random access according to the measurement result on the configured multiple BWPs.
  • Step 1 The terminal initiates random access to perform BFR, but the random access fails.
  • Step 2 The terminal evaluates the measurement result of the SSB or the CSI-RS on the multiple BWPs configured, and selects an SSB or CSI-RS whose channel quality is higher than the threshold.
  • Step 3 If the SSB or CSI-RS is not on the current BWP, change the BWP and initiate random access on the random access resource corresponding to the SSB or CSI-RS.
  • the embodiment of the present invention further provides a user terminal, a computer readable storage medium, and a beam failure recovery device.
  • the principle of solving the problem is similar to a beam failure recovery method.
  • the implementation of these devices can be referred to the implementation of the method, and the repeated description will not be repeated.
  • the user terminal includes:
  • the processor 400 is configured to read a program in the memory 420 and perform the following process:
  • the transceiver 410 is configured to receive and transmit data under the control of the processor 400, and performs the following processes:
  • random access is initiated on the selected BWP for beam failure recovery, including:
  • a random access is initiated on the BWP that is activated before the beam fails, and if there is no non-contention random access resource for the BFR on the activated BWP, the contention random access is initiated to perform beam failure recovery; or
  • a random access is initiated on the BWP that is activated before the beam fails, and if there is a non-contention random access resource for the BFR on the activated BWP, non-contention random access is initiated on the activated BWP, and beam failure recovery is performed; If the non-competitive random access resource for the BFR is not activated, the BWP is changed to the default BWP with the configuration of the non-contention random access resource, and the random access is initiated to perform beam failure recovery; or
  • the beam beam is selected according to the channel quality on the configured multiple BWPs, and random access is initiated on the BWP where the beam is located to perform beam failure recovery.
  • the default BWP with non-contention random access resource configuration is: initial BWP, or default BWP, or specially configured BWP that performs BFR.
  • the beam is selected according to the channel quality on the configured multiple BWPs, including:
  • the beam with the configuration of the non-contention random access resource and the BWP where the BWP is located initiate random access. If all the beams configured with the non-contention random access resource configuration do not meet the channel quality requirements, Then select other beams that meet the channel quality requirements and the BWP in which they are located, and initiate competitive random access.
  • it further includes:
  • the PDCCH scheduling command with the C-RNTI is not received within the configured time; or, when the contention resolution is not successfully completed under the contention random access, the random access is re-initiated for BFR.
  • the random access is re-initiated for BFR, including:
  • Change to the specified BWP perform SSB or CSI-RS measurement on the BWP, select an SSB or CSI-RS whose channel quality is higher than the threshold, and re-initiate according to the random access configuration under the corresponding beam of the SSB or CSI-RS Random access, wherein the specified BWP is an initial BWP or a default BWP; or,
  • the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 400 and various circuits of memory represented by memory 420.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • Transceiver 410 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the user interface 430 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
  • the processor 400 is responsible for managing the bus architecture and general processing, and the memory 420 can store data used by the processor 400 when performing operations.
  • Also provided in an embodiment of the present invention is a computer readable storage medium storing a computer program for performing the beam failure recovery method described above.
  • a computer program for performing the beam failure recovery method described above For details, refer to the implementation of the UE.
  • a beam failure recovery apparatus is further provided in the embodiment of the present invention, including:
  • a determining module configured to determine that the terminal needs to perform beam failure recovery
  • the recovery module is configured to initiate random access to perform beam failure recovery BFR on a part of the bandwidth BWP selected by the terminal, where the BWP change is not performed during the random access process.
  • the terminal initiates random access on the selected BWP to perform beam failure recovery, and does not perform BWP change in the random access process.
  • the terminal can select a reasonable BWP and the SSB or CSI-RS on it to initiate a beam failure recovery process. Fast beam recovery can be achieved while minimizing the impact on data transmission.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

公开了一种波束失败恢复方法、装置及设备，包括：终端确定需要进行波束失败恢复；终端在选定的部分带宽上发起随机接入进行波束失败恢复，其中，在随机接入过程中不进行部分带宽变更。采用本发明，在终端对各部分带宽配置时，不会导致波束失败恢复过程混乱。终端可以选择合理的部分带宽及其上的同步信号块或信道状态信息参考信号发起波束失败恢复过程。可以实现快速波束恢复，同时对数据传输的影响降到最小。进一步的，也使得基站能够确定终端如何进行波束失败恢复，从而能及时响应，在不浪费随机接入资源的同时，能保证数据的有效传输。

Description

一种波束失败恢复方法、装置及设备
本申请要求在2018年01月08日提交中国专利局、申请号为201810015242.6、发明名称为“一种波束失败恢复方法、装置及设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及无线通信技术领域，特别涉及一种波束失败恢复方法、装置及设备。
背景技术
在传统长期演进(Long Term Evolution，LTE)系统中，网络侧角度的小区载波带宽小于或等于终端接收带宽20MHz，因此网络侧总是将小区的上下行总带宽配置给终端，终端可以在整个小区载波带宽上工作。在新一代无线通信系统5G或下一代无线(next generation Radio，NR)系统中，网络侧载波带宽可以高达400MHz，远远大于终端的接收能力。因此，引入部分带宽(Band Width Part，BWP)的概念，即将网络侧的大带宽划分为多个部分带宽BWP，将一个或多个BWP配置给终端，并激活部分配置的BWP为终端进行上下行传输，激活的下行BWP称为active DL BWP，激活的上行BWP称为active UL BWP。在R15版本中，对终端来说，一个时刻只允许激活一个DL BWP和一个UL BWP，非激活的BWP不能进行上下行信令和数据传输。
在基站为终端配置多个BWP后，每个BWP上独立配置各种功能和资源，例如，基站可以针对不同的BWP配置独立的随机接入资源，调度请求资源，物理上行控制信道(Physical Uplink Control Channel，PUCCH)，半持续调度(semi-persistent schedule，SRS)等。
NR系统中，由于引入了高频段，终端和基站在确定的波束上进行传输，基站和终端的接收、发送波束间有对应关系。当终端测量到当前工作的波束信道质量不好，需要发起波束失败恢复过程，该过程是通过随机接入实现的，具体为终端选择特定波束，发起随机接入，随机接入成功后认为在该选定波束上完成了波束失败恢复。
现有技术的不足在于：
在网络侧给终端分配非竞争随机接入资源用于波束失败恢复时，会出现波束失败恢复过程混乱，基站不能确定终端如何进行波束失败恢复，也不能及时响应。
发明内容
本发明提供了一种波束失败恢复方法、装置及设备，用以解决终端在多个BWP配置下，如何选择合理资源实现波束失败恢复的问题。
本发明实施例中提供了一种波束失败恢复方法，包括：
终端确定需要进行波束失败恢复；
终端在选定的部分带宽BWP上发起随机接入进行波束失败恢复BFR，其中，在随机接入过程中不进行BWP变更。
较佳地，终端在选定的BWP上发起随机接入进行波束失败恢复，包括：
终端在波束失败前激活的BWP上发起随机接入，其中，如果该激活BWP上没有用于BFR的非竞争随机接入资源，则发起竞争随机接入，进行波束失败恢复；或，
终端在波束失败前激活的BWP上发起随机接入，其中，如果该激活BWP上有用于BFR的非竞争随机接入资源，终端在该激活BWP上发起非竞争随机接入，进行波束失败恢复；如果该激活BWP上没有用于BFR的非竞争随机接入资源，则变更到默认的有非竞争随机接入资源配置的BWP上，发起随机接入，进行波束失败恢复；或，
终端在配置的多个BWP上根据信道质量选择波束beam，在该beam所在的BWP上发起随机接入，进行波束失败恢复。
较佳地，默认的有非竞争随机接入资源配置的BWP为：初始BWP，或默认BWP，或专门配置的执行BFR的BWP。
较佳地，终端在配置的多个BWP上根据信道质量选择beam，包括：
在不同BWP上进行SSB测量和/或CSI-RS测量，其中，不同的SSB或CSI-RS对应不同的beam；
在满足信道质量要求的beam中，选择有非竞争随机接入资源配置的beam及其所在的BWP发起随机接入，如果所有配置了非竞争随机接入资源配置的beam都不满足信道质量要求，则选择满足信道质量要求的其他beam及其所在的BWP，发起竞争随机接入。
较佳地，进一步包括：
在非竞争随机接入下，终端没有在配置时间内接收到带C-RNTI的PDCCH调度命令；或，竞争随机接入下，没有成功完成竞争解决时，重新发起随机接入进行BFR。
较佳地，重新发起随机接入进行BFR，包括：
使用上次发起随机接入BWP和beam，以及随机接入资源，重新发起随机接入，直到达到最大随机接入次数或BFR定时器超时；或，
在当前BWP上进行波束质量测量，重新选择一个SSB或CSI-RS，并根据该SSB或CSI-RS 对应波束下的随机接入配置在当前BWP上重新发起随机接入；或，
变更到指定的BWP，在该BWP上进行SSB或CSI-RS测量，选择一个信道质量高于门限的SSB或CSI-RS，并根据该SSB或CSI-RS对应波束下的随机接入配置重新发起随机接入，其中，该指定BWP为初始BWP或默认BWP；或，
根据配置的多个BWP上SSB或CSI-RS测量的结果，重新选择一个SSB和/或CSI-RS及其对应波束，并根据该SSB或CSI-RS对应波束下的随机接入配置重新发起随机接入，如果该SSB和/或CSI-RS不在当前BWP上，终端变更到该SSB和/或CSI-RS所在的BWP上重新发起随机接入。
本发明实施例中提供了一种用户终端，包括：
处理器，用于读取存储器中的程序，执行下列过程：
确定是否需要进行波束失败恢复；
收发机，用于在处理器的控制下接收和发送数据，执行下列过程：
在确定需要进行波束失败恢复时，在选定的部分带宽BWP上发起随机接入进行波束失败恢复BFR，其中，在随机接入过程中不进行BWP变更。
较佳地，在选定的BWP上发起随机接入进行波束失败恢复，包括：
在波束失败前激活的BWP上发起随机接入，其中，如果该激活BWP上没有用于BFR的非竞争随机接入资源，则发起竞争随机接入，进行波束失败恢复；或，
在波束失败前激活的BWP上发起随机接入，其中，如果该激活BWP上有用于BFR的非竞争随机接入资源，在该激活BWP上发起非竞争随机接入，进行波束失败恢复；如果该激活BWP上没有用于BFR的非竞争随机接入资源，则变更到默认的有非竞争随机接入资源配置的BWP上，发起随机接入，进行波束失败恢复；或，
在配置的多个BWP上根据信道质量选择波束beam，在该beam所在的BWP上发起随机接入，进行波束失败恢复。
较佳地，默认的有非竞争随机接入资源配置的BWP为：初始BWP，或默认BWP，或专门配置的执行BFR的BWP。
较佳地，在配置的多个BWP上根据信道质量选择beam，包括：
在不同BWP上进行SSB测量和/或CSI-RS测量，其中，不同的SSB或CSI-RS对应不同的beam；
在满足信道质量要求的beam中，选择有非竞争随机接入资源配置的beam及其所在的BWP发起随机接入，如果所有配置了非竞争随机接入资源配置的beam都不满足信道质量要求，则选择满足信道质量要求的其他beam及其所在的BWP，发起竞争随机接入。
较佳地，进一步包括：
在非竞争随机接入下，没有在配置时间内接收到带C-RNTI的PDCCH调度命令；或，竞争随机接入下，没有成功完成竞争解决时，重新发起随机接入进行BFR。
较佳地，重新发起随机接入进行BFR，包括：
使用上次发起随机接入BWP和beam，以及随机接入资源，重新发起随机接入，直到达到最大随机接入次数或BFR定时器超时；或，
在当前BWP上进行波束质量测量，重新选择一个SSB或CSI-RS，并根据该SSB或CSI-RS对应波束下的随机接入配置在当前BWP上重新发起随机接入；或，
变更到指定的BWP，在该BWP上进行SSB或CSI-RS测量，选择一个信道质量高于门限的SSB或CSI-RS，并根据该SSB或CSI-RS对应波束下的随机接入配置重新发起随机接入，其中，该指定BWP为初始BWP或默认BWP；或，
根据配置的多个BWP上SSB或CSI-RS测量的结果，重新选择一个SSB和/或CSI-RS及其对应波束，并根据该SSB或CSI-RS对应波束下的随机接入配置重新发起随机接入，如果该SSB和/或CSI-RS不在当前BWP上，变更到该SSB和/或CSI-RS所在的BWP上重新发起随机接入。
本发明实施例中提供了一种计算机可读存储介质，所述计算机可读存储介质存储有执行上述方法的计算机程序。
本发明实施例中提供了一种波束失败恢复装置，包括：
确定模块，用于确定终端需要进行波束失败恢复；
恢复模块，用于在终端选定的部分带宽BWP上发起随机接入进行波束失败恢复BFR，其中，在随机接入过程中不进行BWP变更。本发明有益效果如下：
在本发明实施例提供的技术方案中，终端在选定的BWP上发起随机接入进行波束失败恢复，在随机接入过程中不进行BWP变更。由于该过程中不进行BWP变更，因此在终端对各BWP配置时，不会导致波束失败恢复过程混乱。终端可以选择合理的BWP及其上的SSB或CSI-RS发起波束失败恢复过程。可以实现快速波束恢复，同时对数据传输的影响降到最小。
进一步的，也使得基站能够确定终端如何进行波束失败恢复，从而能及时响应，在不浪费随机接入资源的同时，能保证数据的有效传输。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本发明的一部分，本发明的 示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1为本发明实施例中竞争随机接入过程示意图；
图2为本发明实施例中非竞争随机接入过程示意图；
图3为本发明实施例中波束失败恢复方法实施流程示意图；
图4为本发明实施例中用户终端结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
应理解，本发明的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、先进的长期演进(Advanced long term evolution，LTE-A)系统、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、新空口(New Radio，NR)等。
还应理解，在本发明实施例中，用户设备(User Equipment，UE)包括但不限于移动台(Mobile Station，MS)、移动终端(Mobile Terminal)、移动电话(Mobile Telephone)、手机(handset)及便携设备(portable equipment)等，该用户设备可以经无线接入网(Radio Access Network，RAN)与一个或多个核心网进行通信，例如，用户设备可以是移动电话(或称为“蜂窝”电话)、具有无线通信功能的计算机等，用户设备还可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置。
在本发明实施例中，基站(例如，接入点)可以是指接入网中在空中接口上通过一个或多个扇区与无线终端通信的设备。基站可用于将收到的空中帧与IP分组进行相互转换，作为无线终端与接入网的其余部分之间的路由器，其中接入网的其余部分可包括网际协议(IP)网络。基站还可协调对空中接口的属性管理。例如，基站可以是GSM或CDMA中的基站(Base Transceiver Station，BTS)，也可以是TD-SCDMA或WCDMA中的基站(NodeB)，还可以是LTE中的演进型基站(eNodeB或eNB或e-NodeB，evolutional Node B)，或者是5G NR中的基站(gNB)，本发明并不限定。
发明人在发明过程中注意到：
在新一代无线通信系统(5G或NR系统)中，引入BWP的概念，一个小区载波带宽可以划分为多个BWP，基站可以为终端配置多个BWP，每个BWP上独立配置各种功能和资源，例如基站可以针对不同的BWP配置独立的随机接入资源，调度请求资源，PUCCH，SRS等。会出现在多个BWP配置下，如何选择合理资源实现波束失败恢复的问题。
下面先对BWP进行简要介绍如下：
对于BWP，3GPP还定义了一些基本概念：
初始BWP(initial BWP)：对于初始接入的终端来说，只能使用初始BWP(initial BWP)完成连接建立过程。初始BWP中包含基本的小区广播信令和随机接入资源等。
默认BWP(default BWP)：网络侧下一代基站(next generation NodeB，gNB)可以给连接态终端配置一个默认BWP，终端可以在默认BWP上进行一些基本工作，如保持小区连接、进行小区测量、发起随机接入等。
配置BWP(configured BWP)：网络侧为单个连接态终端配置的BWP，各个BWP分别独立配置各层参数，如PUCCH配置、SPS配置、物理随机接入信道(Physical Random Access Channel，PRACH)配置，波束失败恢复(beam failure recovery，BFR)使用的非竞争接入资源等。
激活BWP(active BWP)：在网络侧为终端配置的BWP中，终端只能使用激活的BWP进行上下行传输。激活BWP分为active DL BWP和active UL BWP。基站用物理层信令下行控制指示(Downlink Control Indicator，DCI)显式变更激活BWP。此外，还引入BWP-InactivityTimer(以下称为BWP定时器)，BWP定时器超时后终端从激活BWP变更到默认BWP。
再对随机接入进行简要介绍如下：
随机接入分为竞争随机接入和非竞争随机接入两种。其过程分别如下：
图1为竞争随机接入过程示意图，竞争随机接入过程如图所示，主要分为四步：
Msg1：用户设备(User Equipment，UE)选择随机接入码preamble(随机接入前导码)和随机接入资源PRACH，在选择的PRACH资源上向基站发送所选的随机接入码preamble。在NR中，为基于Msg1的系统消息请求“Msg1based SI request”预留特定的preamble和/或PRACH资源。
Msg2：基站接收到随机接入请求Msg1，向UE发送随机接入响应，随机接入响应中包含上行定时提前量、为Msg3分配的上行资源上行调度信息(UL grant)、网络侧分配的临时小区无线网络临时标识(Cell-Radio Network Temporary Identifier，C-RNTI)。承载Msg2调 度消息的物理下行控制信道(physical downlink control channel，PDCCH)用随机接入-无线网络临时标识(Random Access-Radio Network Temporary，RA-RNTI)加扰，Msg2中还携带preamble ID，UE通过RA-RNTI和preamble ID确定该Msg2是与其发送的Msg1对应的。在NR中，针对基于Msg1的系统消息请求，Msg2中只包含于Msg1对应的preamble ID信息，没有其他内容。并且对于基于Msg1的系统消息请求场景，随机接入过程到Msg2就结束了，即如果接收到的Msg2中包含与Msg1发送的preamble对应的preamble ID，则认为基于Msg1的系统消息请求过程完成。
Msg3：UE在Msg2指定的UL grant上发送上行传输，不同随机接入原因Msg3上行传输的内容不同，比如对于初始接入，Msg3传输的是无线资源控制(Radio Resource Control，RRC)连接建立请求。
Msg4：竞争解决消息，UE根据Msg4可以判断随机接入是否成功。对于初始接入UE，竞争解决成功后临时C-RNTI自动转化为UE在该小区的唯一UE标识C-RNTI。
图2为非竞争随机接入过程示意图，非竞争随机接入过程如图所示，主要分为三步：
Msg0：基站向UE分配用于非竞争随机接入的专用preamble以及随机接入使用的PRACH资源。
Msg1：UE根据Msg0的指示，在指定的PRACH资源上向基站发送指定的专用preamble。基站接收到Msg1后根据Msg1计算上行定时提前量(Timing Advance，TA)。
Msg2：基站向UE发送随机接入响应。大多数随机接入场景中，随机接入响应的格式和竞争随机接入一样，采用带RA-RNTI的PDCCH调度媒体接入控制随机接入响应协议数据单元(Media Access Control Random Access Response Protocol Data Unit，MAC RAR PDU)，MAC RAR PDU中包含随机接入前导码标识(Random Access Preamble ID，RAPID)，定时提前量信息时间对准命令(Time Alignment Command，TAC)、后续上行传输资源分配UL grant，终端通过随机接入响应MAC RAR中的RAPID与Msg1发送的preamble码相同完成竞争解决。
NR还引入一种新的非竞争随机接入场景：波束失败恢复BFR，这种场景下，Msg2为携带C-RNTI的PDCCH，主要该C-RNTI与终端的C-RNTI一致，终端判断随机接入成功，从而波束失败恢复成功。
NR系统中，由于引入了高频段，终端和基站在确定的波束上进行传输，基站和终端的接收、发送波束间有对应关系。当终端测量到当前工作的波束信道质量不好，需要发起波束失败恢复过程，该过程是通过随机接入实现的，具体为终端选择特定波束，发起随机接入，随机接入成功后认为在该选定波束上完成了波束失败恢复。网络侧为终端在多个波束 上分配非竞争接入资源(PRACH资源和/或preamble码)，如果终端选定波束上有非竞争随机接入资源，则发起非竞争随机接入，终端发送Msg1后，在配置时间内接收到该终端C-RNTI加扰的PDCCH命令，则认为非竞争随机接入成功。如果终端选定的波束上没有分配非竞争随机接入资源，终端则以竞争随机接入方式进行波束失败恢复。波束失败恢复的非竞争随机接入资源在不同BWP上是独立分配的。波束恢复指的是终端重新找到信道质量满足要求的波束(beam)，具体表现为终端选择到新的同步信号块(Synchronization Signal Block，SSB)或信道状态信息参考信号(channel state information reference signal，CSI-RS)，不同SSB或CSI-RS是与不同beam对应的。在本申请描述中，选择beam等同于选择SSB或CSI-RS。
现有技术的不足也在于：
如果网络侧给终端分配了非竞争随机接入资源用于波束失败恢复，但终端激活的BWP上没有分配非竞争随机接入资源，当前机制没有规定这种状态下的终端行为。这会导致终端在对各BWP配置时，波束失败恢复过程混乱，基站不确定终端如何进行波束失败恢复，不能及时响应，浪费随机接入资源的同时，不能保证数据的有效传输。
基于此，本发明实施例中提供了进行波束失败恢复的方案，用以解决终端在多个BWP配置下，如何选择合理资源实现波束失败恢复的问题。
下面结合附图对本发明的具体实施方式进行说明。
在说明过程中，将只描述终端侧行为，基站侧只需执行相应的与终端侧过程相对应的随机接入过程即可。
图3为波束失败恢复方法实施流程示意图，如图所示，可以包括：
步骤301、终端确定需要进行波束失败恢复；
步骤302、终端在选定的BWP上发起随机接入进行波束失败恢复，其中，在随机接入过程中不进行BWP变更。
具体的，终端在选定的BWP上发起随机接入进行波束失败恢复，在随机接入过程中不进行BWP变更。
实施中，终端在选定的BWP上发起随机接入进行波束失败恢复，包括以下三种方式：
1、终端在波束失败前激活的BWP上发起随机接入，其中，如果该激活BWP上没有用于BFR的非竞争随机接入资源，则发起竞争随机接入，进行波束失败恢复。
具体的，终端在波束失败前激活的BWP上发起随机接入，如果该激活BWP上没有用于BFR的非竞争随机接入资源，则发起竞争随机接入，进行波束失败恢复。
2、终端在波束失败前激活的BWP上发起随机接入，其中，如果该激活BWP上有用于 BFR的非竞争随机接入资源，终端在该激活BWP上发起非竞争随机接入，进行波束失败恢复；如果该激活BWP上没有用于BFR的非竞争随机接入资源，则变更到默认的有非竞争随机接入资源配置的BWP上，发起随机接入，进行波束失败恢复。
实施中，默认的有非竞争随机接入资源配置的BWP可以为：初始BWP，或默认BWP，或专门配置的执行BFR的BWP。
具体的，终端判断波束失败前激活的BWP上是否有用于BFR的非竞争随机接入资源，如果有，终端在该激活BWP上发起非竞争随机接入，进行波束失败恢复；如果没有，则变更到默认的有非竞争随机接入资源配置的BWP上，发起随机接入，进行波束失败恢复，该默认的有非竞争随机接入资源配置的BWP可以为初始BWP，或默认BWP，或专门配置的执行BFR的BWP。
3、终端在配置的多个BWP上根据信道质量选择beam，在该beam所在的BWP上发起随机接入，进行波束失败恢复。
实施中，终端在配置的多个BWP上根据信道质量选择beam，可以包括：
在不同BWP上进行SSB测量和/或CSI-RS测量，其中，不同的SSB或CSI-RS对应不同的beam；
在满足信道质量要求的beam中，选择有非竞争随机接入资源配置的beam及其所在的BWP发起随机接入，如果所有配置了非竞争随机接入资源配置的beam都不满足信道质量要求，则选择满足信道质量要求的其他beam及其所在的BWP，发起竞争随机接入。
具体的，终端在配置的多个BWP上选择信道质量足够好的beam，在该beam对应的BWP上发起随机接入，进行波束失败恢复。终端选择信道质量足够好的beam的方式可以为：
在不同BWP的上进行SSB测量和/或CSI-RS测量，在NR系统中，不同的SSB或CSI-RS与不同的beam相对应；在满足信道质量要求(例如大于设定的信道质量门限)的beam中，选择有非竞争随机接入资源配置的beam及其所在的BWP发起随机接入，如果所有配置了非竞争随机接入资源配置的beam都不满足信道质量要求，则选择满足信道质量要求的其他beam及其所在的BWP，发起竞争随机接入。
一次随机接入失败是指：非竞争随机接入下，终端没有在配置时间内接收到带C-RNTI的PDCCH调度命令，或竞争随机接入下，没有成功完成竞争解决。针对终端在一次随机接入失败后的情况。其中，非竞争随机接入下终端在配置时间内接收带C-RNTI的PDCCH调度命令中的“配置时间”是指用于接收基站随机接入响应的规定时间，一般为随机接入响应接收窗长。
实施中，还可以进一步包括：
在非竞争随机接入下，终端没有在配置时间内接收到带C-RNTI的PDCCH调度命令；或，竞争随机接入下，没有成功完成竞争解决时，重新发起随机接入进行BFR。
实施中，终端在一次随机接入失败后，可以有以下几种方式重新发起随机接入进行BFR：
1、使用上次发起随机接入BWP和beam，以及随机接入资源，重新发起随机接入，直到达到最大随机接入次数或BFR定时器超时。
具体的，终端在一次随机接入失败后，使用上次发起随机接入BWP和beam(表示为SSB或CSI-RS)，以及随机接入资源，重新发起随机接入，直到达到最大随机接入次数或BFR定时器超时。
2、在当前BWP上进行波束质量测量，重新选择一个SSB或CSI-RS，并根据SSB或CSI-RS对应波束下的随机接入配置在当前BWP上重新发起随机接入。
具体的，终端在一次随机接入失败后，在当前BWP上进行波束质量测量，重新选择一个SSB或CSI-RS，并根据SSB或CSI-RS对应波束下的随机接入配置在当前BWP上重新发起随机接入。
3、变更到指定的BWP，在该BWP上进行SSB或CSI-RS测量，选择一个信道质量高于门限的SSB或CSI-RS，并根据该SSB或CSI-RS对应波束下的随机接入配置重新发起随机接入，其中，该指定BWP为初始BWP或默认BWP。
具体的，终端在一次随机接入失败后，变更到指定的BWP，在该BWP上进行SSB或CSI-RS测量，选择一个信道质量高于门限的SSB或CSI-RS，并根据该SSB或CSI-RS对应波束下的随机接入配置重新发起随机，该指定BWP为初始BWP或默认BWP。
4、根据配置的多个BWP上SSB或CSI-RS测量的结果，重新选择一个SSB和/或CSI-RS及其对应波束，并根据该SSB或CSI-RS对应波束下的随机接入配置重新发起随机接入，如果该SSB和/或CSI-RS不在当前BWP上，终端变更到该SSB和/或CSI-RS所在的BWP上重新发起随机接入。
具体的，终端在一次随机接入失败后，根据配置的多个BWP上SSB或CSI-RS测量的结果，重新选择一个SSB和/或CSI-RS及其对应波束，并根据SSB或CSI-RS对应波束下的随机接入配置重新发起随机接入，如果该SSB和/或CSI-RS不在当前BWP上，终端需要变更到该SSB和/或CSI-RS所在的BWP上。
下面以实例来进行说明，以下实施例只描述终端侧行为，基站侧执行与终端侧过程相对应的随机接入过程即可。
实施例1：
本例中，终端只在当前激活BWP上进行BFR。
终端侧：
步骤1：终端检测到波束失败；
步骤2：终端只在发现波束失败前激活的BWP上进行SSB和/或CSI-RS测量；
步骤3：当检测到满足信道质量要求的SSB和/或CSI-RS时，在其对应的波束上发起随机接入，包括：
在满足信道质量要求的波束中选择一个波束，如果满足信道质量要求的波束中有配置了非竞争随机接入资源的波束，则选择该类波束，在选择的波束上用非竞争随机接入过程发起随机接入，进行BFR；
如果满足信道质量要求的波束都没有配置非竞争随机接入资源，或该BWP上完全没有配置用于BFR的非竞争随机接入资源，则发起竞争随机接入，进行BFR。
在该次随机接入过程中，终端都不进行BWP变更。
实施例2：
本例中，终端在指定的可以进行BFR的BWP上进行BFR。
终端侧：
步骤1：终端检测到波束失败；
步骤2：终端在发现波束失败前激活的BWP上进行SSB和/或CSI-RS测量；
步骤3：如果没有检测到满足信道质量要求的波束或满足信道质量要求的波束都没有配置用于BFR的非竞争随机接入资源，终端变更到默认的有非竞争随机接入资源配置的BWP上，该BWP可以为初始BWP，或默认BWP，或专门配置的执行BFR的BWP；
步骤4：在变更到的BWP上进行SSB和/或CSI-RS测量；
步骤5：当检测到满足信道质量要求的SSB和/或CSI-RS时，在其对应的波束上发起随机接入，包括：
在满足信道质量要求的波束中选择一个波束，如果满足信道质量要求的波束中有配置了非竞争随机接入资源的波束，则选择该类波束，在选择的波束上用非竞争随机接入过程发起随机接入，进行BFR；
如果满足信道质量要求的波束都没有配置非竞争随机接入资源，则发起竞争随机接入，进行BFR。
实施例3：
本例中，终端通过在所有配置的BWP上测量选择BWP进行BFR。
终端侧：
步骤1：终端检测到波束失败；
步骤2：终端在配置的多个BWP上进行SSB和/或CSI-RS测量；
步骤3：终端对所有的测量结果进行筛选，选择满足信道质量要求的SSB和/或CSI-RS及其对应的beam，优先选择配置了非竞争随机接入资源的beam，如果没有该类beam，才选择没有配置非竞争随机接入资源的beam；
步骤4：终端变更到选定SSB和/或CSI-RS所在的BWP，在其该beam上发起随机接入，包括：
如果该波束配置了非竞争随机接入资源，终端发起非竞争随机接入，进行BFR；
如果该波束没有配置非竞争随机接入资源，终端发起竞争随机接入，进行BFR。
实施例4：
本例中，终端在一次随机接入失败后，在当前BWP的beam上重新发起随机接入进行BFR。
终端侧：
步骤1：终端发起随机接入进行BFR，但该次随机接入失败；
步骤2：终端在上次发起随机接入的BWP及beam(SSB或CSI-RS)上重新发起随机接入，如果上次是非竞争随机接入，则本次在该SSB或CSI-RS对应的非竞争随机接入资源中选择一个非竞争随机接入资源发起非竞争随机接入；如果上次是竞争随机接入，则本次在该SSB或CSI-RS对应的波束上发起竞争随机接入。
实施例5：
本例中，终端在一次随机接入失败后，在当前BWP重新选择beam发起随机接入进行BFR。
终端侧：
步骤1：终端发起随机接入进行BFR，但该次随机接入失败；
步骤2：终端在上次发起随机接入的BWP上，重新选择满足信道质量要求的SSB或CSI-RS，优先选择配置了非竞争随机接入资源的SSB或CSI-RS，重新发起随机接入进行BFR。
实施例6：
本例中，终端变更到指定BWP发起随机接入。
终端侧：
步骤1：终端发起随机接入进行BFR，但该次随机接入失败；
步骤2：终端变更到指定的BWP，该指定BWP为初始BWP或默认BWP；
步骤3：终端在该BWP上进行SSB或CSI-RS测量，选择一个信道质量高于门限的SSB或CSI-RS，并根据该SSB或CSI-RS对应的随机接入配置重新发起随机接入。
实施例7：
本例中，终端根据配置的多个BWP上的测量结果选择SSB或CSI-RS发起随机接入。
终端侧：
步骤1：终端发起随机接入进行BFR，但该次随机接入失败；
步骤2：终端评估配置的多个BWP上SSB或CSI-RS的测量结果，选择一个信道质量高于门限的SSB或CSI-RS；
步骤3：如果该SSB或CSI-RS不在当前BWP上，变更BWP，在该SSB或CSI-RS对应的随机接入资源上发起随机接入。
基于同一发明构思，本发明实施例中还提供了一种用户终端、一种计算机可读存储介质、一种波束失败恢复装置，由于这些设备解决问题的原理与一种波束失败恢复方法相似，因此这些设备的实施可以参见方法的实施，重复之处不再赘述。
在实施本发明实施例提供的技术方案时，可以按如下方式实施。
图4为用户终端结构示意图，如图所示，用户终端包括：
处理器400，用于读取存储器420中的程序，执行下列过程：
在确定是否需要进行波束失败恢复；
收发机410，用于在处理器400的控制下接收和发送数据，执行下列过程：
在确定需要进行波束失败恢复时，在选定的部分带宽BWP上发起随机接入进行波束失败恢复BFR，其中，在随机接入过程中不进行BWP变更。
实施中，在选定的BWP上发起随机接入进行波束失败恢复，包括：
在波束失败前激活的BWP上发起随机接入，其中，如果该激活BWP上没有用于BFR的非竞争随机接入资源，则发起竞争随机接入，进行波束失败恢复；或，
在波束失败前激活的BWP上发起随机接入，其中，如果该激活BWP上有用于BFR的非竞争随机接入资源，在该激活BWP上发起非竞争随机接入，进行波束失败恢复；如果该激活BWP上没有用于BFR的非竞争随机接入资源，则变更到默认的有非竞争随机接入资源配置的BWP上，发起随机接入，进行波束失败恢复；或，
在配置的多个BWP上根据信道质量选择波束beam，在该beam所在的BWP上发起随机接入，进行波束失败恢复。
实施中，默认的有非竞争随机接入资源配置的BWP为：初始BWP，或默认BWP，或专门配置的执行BFR的BWP。
实施中，在配置的多个BWP上根据信道质量选择beam，包括：
在不同BWP上进行SSB测量和/或CSI-RS测量，其中，不同的SSB或CSI-RS对应不同的beam；
在满足信道质量要求的beam中，选择有非竞争随机接入资源配置的beam及其所在的BWP发起随机接入，如果所有配置了非竞争随机接入资源配置的beam都不满足信道质量要求，则选择满足信道质量要求的其他beam及其所在的BWP，发起竞争随机接入。
实施中，进一步包括：
在非竞争随机接入下，没有在配置时间内接收到带C-RNTI的PDCCH调度命令；或，竞争随机接入下，没有成功完成竞争解决时，重新发起随机接入进行BFR。
实施中，重新发起随机接入进行BFR，包括：
使用上次发起随机接入BWP和beam，以及随机接入资源，重新发起随机接入，直到达到最大随机接入次数或BFR定时器超时；或，
在当前BWP上进行波束质量测量，重新选择一个SSB或CSI-RS，并根据该SSB或CSI-RS对应波束下的随机接入配置在当前BWP上重新发起随机接入；或，
变更到指定的BWP，在该BWP上进行SSB或CSI-RS测量，选择一个信道质量高于门限的SSB或CSI-RS，并根据该SSB或CSI-RS对应波束下的随机接入配置重新发起随机接入，其中，该指定BWP为初始BWP或默认BWP；或，
根据配置的多个BWP上SSB或CSI-RS测量的结果，重新选择一个SSB和/或CSI-RS及其对应波束，并根据该SSB或CSI-RS对应波束下的随机接入配置重新发起随机接入，如果该SSB和/或CSI-RS不在当前BWP上，变更到该SSB和/或CSI-RS所在的BWP上重新发起随机接入。
其中，在图4中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器400代表的一个或多个处理器和存储器420代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机410可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元。针对不同的用户终端，用户接口430还可以是能够外接内接需要设备的接口，连接的设备包括但不限于小键盘、显示器、扬声器、麦克风、操纵杆等。
处理器400负责管理总线架构和通常的处理，存储器420可以存储处理器400在执行操作时所使用的数据。
本发明实施例中还提供了一种计算机可读存储介质，所述计算机可读存储介质存储有 执行上述波束失败恢复方法的计算机程序。具体可以参见UE的实施。
本发明实施例中还提供了一种波束失败恢复装置，包括：
确定模块，用于确定终端需要进行波束失败恢复；
恢复模块，用于在终端选定的部分带宽BWP上发起随机接入进行波束失败恢复BFR，其中，在随机接入过程中不进行BWP变更。
为了描述的方便，以上所述装置的各部分以功能分为各种模块或单元分别描述。当然，在实施本发明时可以把各模块或单元的功能在同一个或多个软件或硬件中实现。
综上所述，在本发明实施例提供的技术方案中，终端在选定的BWP上发起随机接入进行波束失败恢复，在随机接入过程中不进行BWP变更。通过本方案，终端可以选择合理的BWP及其上的SSB或CSI-RS发起波束失败恢复过程。可以实现快速波束恢复，同时对数据传输的影响降到最小。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明实施例的精神和范围。这样，倘若本发明实施例的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (14)

  1. 一种波束失败恢复方法，其特征在于，包括：
    终端确定需要进行波束失败恢复；
    终端在选定的部分带宽BWP上发起随机接入进行波束失败恢复BFR，其中，在随机接入过程中不进行BWP变更。
  2. 如权利要求1所述的方法，其特征在于，终端在选定的BWP上发起随机接入进行波束失败恢复，包括：
    终端在波束失败前激活的BWP上发起随机接入，其中，如果该激活BWP上没有用于BFR的非竞争随机接入资源，则发起竞争随机接入，进行波束失败恢复；或，
    终端在波束失败前激活的BWP上发起随机接入，其中，如果该激活BWP上有用于BFR的非竞争随机接入资源，终端在该激活BWP上发起非竞争随机接入，进行波束失败恢复；如果该激活BWP上没有用于BFR的非竞争随机接入资源，则变更到默认的有非竞争随机接入资源配置的BWP上，发起随机接入，进行波束失败恢复；或，
    终端在配置的多个BWP上根据信道质量选择波束beam，在该beam所在的BWP上发起随机接入，进行波束失败恢复。
  3. 如权利要求2所述的方法，其特征在于，默认的有非竞争随机接入资源配置的BWP为：初始BWP，或默认BWP，或专门配置的执行BFR的BWP。
  4. 如权利要求2所述的方法，其特征在于，终端在配置的多个BWP上根据信道质量选择beam，包括：
    在不同BWP上进行同步信号块SSB测量和/或信道状态信息参考信号CSI-RS测量，其中，不同的SSB或CSI-RS对应不同的beam；
    在满足信道质量要求的beam中，选择有非竞争随机接入资源配置的beam及其所在的BWP发起随机接入，如果所有配置了非竞争随机接入资源配置的beam都不满足信道质量要求，则选择满足信道质量要求的其他beam及其所在的BWP，发起竞争随机接入。
  5. 如权利要求1至4任一所述的方法，其特征在于，进一步包括：
    在非竞争随机接入下，终端没有在配置时间内接收到带小区无线网络临时标识C-RNTI的物理下行控制信道PDCCH调度命令；或，竞争随机接入下，没有成功完成竞争解决时，重新发起随机接入进行BFR。
  6. 如权利要求5所述的方法，其特征在于，重新发起随机接入进行BFR，包括：
    使用上次发起随机接入BWP和beam，以及随机接入资源，重新发起随机接入，直到达 到最大随机接入次数或BFR定时器超时；或，
    在当前BWP上进行波束质量测量，重新选择一个SSB或CSI-RS，并根据该SSB或CSI-RS对应波束下的随机接入配置在当前BWP上重新发起随机接入；或，
    变更到指定的BWP，在该BWP上进行SSB或CSI-RS测量，选择一个信道质量高于门限的SSB或CSI-RS，并根据该SSB或CSI-RS对应波束下的随机接入配置重新发起随机接入，其中，该指定BWP为初始BWP或默认BWP；或，
    根据配置的多个BWP上SSB或CSI-RS测量的结果，重新选择一个SSB和/或CSI-RS及其对应波束，并根据该SSB或CSI-RS对应波束下的随机接入配置重新发起随机接入，如果该SSB和/或CSI-RS不在当前BWP上，终端变更到该SSB和/或CSI-RS所在的BWP上重新发起随机接入。
  7. 一种用户终端，其特征在于，包括：
    处理器，用于读取存储器中的程序，执行下列过程：
    确定是否需要进行波束失败恢复；
    收发机，用于在处理器的控制下接收和发送数据，执行下列过程：
    在确定需要进行波束失败恢复时，在选定的部分带宽BWP上发起随机接入进行波束失败恢复BFR，其中，在随机接入过程中不进行BWP变更。
  8. 如权利要求7所述的用户终端，其特征在于，在选定的BWP上发起随机接入进行波束失败恢复，包括：
    在波束失败前激活的BWP上发起随机接入，其中，如果该激活BWP上没有用于BFR的非竞争随机接入资源，则发起竞争随机接入，进行波束失败恢复；或，
    在波束失败前激活的BWP上发起随机接入，其中，如果该激活BWP上有用于BFR的非竞争随机接入资源，在该激活BWP上发起非竞争随机接入，进行波束失败恢复；如果该激活BWP上没有用于BFR的非竞争随机接入资源，则变更到默认的有非竞争随机接入资源配置的BWP上，发起随机接入，进行波束失败恢复；或，
    在配置的多个BWP上根据信道质量选择波束beam，在该beam所在的BWP上发起随机接入，进行波束失败恢复。
  9. 如权利要求8所述的用户终端，其特征在于，默认的有非竞争随机接入资源配置的BWP为：初始BWP，或默认BWP，或专门配置的执行BFR的BWP。
  10. 如权利要求8所述的用户终端，其特征在于，在配置的多个BWP上根据信道质量选择beam，包括：
    在不同BWP上进行SSB测量和/或CSI-RS测量，其中，不同的SSB或CSI-RS对应不同的 beam；
    在满足信道质量要求的beam中，选择有非竞争随机接入资源配置的beam及其所在的BWP发起随机接入，如果所有配置了非竞争随机接入资源配置的beam都不满足信道质量要求，则选择满足信道质量要求的其他beam及其所在的BWP，发起竞争随机接入。
  11. 如权利要求7至10任一所述的用户终端，其特征在于，进一步包括：
    在非竞争随机接入下，没有在配置时间内接收到带C-RNTI的PDCCH调度命令；或，竞争随机接入下，没有成功完成竞争解决时，重新发起随机接入进行BFR。
  12. 如权利要求11所述的用户终端，其特征在于，重新发起随机接入进行BFR，包括：
    使用上次发起随机接入BWP和beam，以及随机接入资源，重新发起随机接入，直到达到最大随机接入次数或BFR定时器超时；或，
    在当前BWP上进行波束质量测量，重新选择一个SSB或CSI-RS，并根据该SSB或CSI-RS对应波束下的随机接入配置在当前BWP上重新发起随机接入；或，
    变更到指定的BWP，在该BWP上进行SSB或CSI-RS测量，选择一个信道质量高于门限的SSB或CSI-RS，并根据该SSB或CSI-RS对应波束下的随机接入配置重新发起随机接入，其中，该指定BWP为初始BWP或默认BWP；或，
    根据配置的多个BWP上SSB或CSI-RS测量的结果，重新选择一个SSB和/或CSI-RS及其对应波束，并根据该SSB或CSI-RS对应波束下的随机接入配置重新发起随机接入，如果该SSB和/或CSI-RS不在当前BWP上，变更到该SSB和/或CSI-RS所在的BWP上重新发起随机接入。
  13. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有执行权利要求1至6任一所述方法的计算机程序。
  14. 一种波束失败恢复装置，其特征在于，包括：
    确定模块，用于确定终端需要进行波束失败恢复；
    恢复模块，用于在终端选定的部分带宽BWP上发起随机接入进行波束失败恢复BFR，其中，在随机接入过程中不进行BWP变更。
PCT/CN2018/121852 2018-01-08 2018-12-18 一种波束失败恢复方法、装置及设备 WO2019134506A1 (zh)

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EP18898972.7A EP3739933B1 (en) 2018-01-08 2018-12-18 Beam failure recovery method, device, and apparatus
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US16/960,321 US11109247B2 (en) 2018-01-08 2018-12-18 Beam failure recovery method, device, and apparatus
JP2020537627A JP7170730B2 (ja) 2018-01-08 2018-12-18 ビーム失敗回復方法、装置およびデバイス

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