WO2023246765A1 - 由用户设备执行的方法及用户设备 - Google Patents

由用户设备执行的方法及用户设备 Download PDF

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Publication number
WO2023246765A1
WO2023246765A1 PCT/CN2023/101350 CN2023101350W WO2023246765A1 WO 2023246765 A1 WO2023246765 A1 WO 2023246765A1 CN 2023101350 W CN2023101350 W CN 2023101350W WO 2023246765 A1 WO2023246765 A1 WO 2023246765A1
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Prior art keywords
random access
trp
triggered
user equipment
determined
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English (en)
French (fr)
Inventor
张崇铭
刘仁茂
山田升平
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Sharp Corp
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Sharp Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • 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 technology, and more specifically, the present invention relates to a method executed by user equipment and the corresponding user equipment.
  • the 3rd Generation Partnership Project (3GPP) plans to study uplink transmission under multiple transmitting and receiving nodes (TRP).
  • TRP transmitting and receiving nodes
  • a serving cell more than one sending and receiving node TRP can be arranged, and each TRP provides services to the same UE, as shown in Figure 1. Due to the different physical distances between different TRPs and the UE, the propagation delays are different, so the values of the timing advance (Timing Advance) used by the UE when sending different TRPs are different.
  • the UE can trigger a random access process by receiving a PDCCH order (PDCCH order) from the network layer, and obtain a valid TA value in the process, thereby updating its maintained time advance.
  • PDCCH order PDCCH order
  • the UE only interacts with one TRP on a serving cell and maintains one TA value; with the introduction of multiple TRPs, how the UE maintains multiple TA values is a problem that needs to be solved.
  • the present invention provides a user equipment that can effectively maintain multiple TA values to reliably perform uplink transmission under multiple TRPs even when the UE is configured with multiple TRPs on a serving cell.
  • the method of execution and the corresponding user device are described in detail below.
  • a method performed by user equipment including the following steps:
  • the user equipment UE receives the physical downlink control channel PDCCH command from the base station and triggers the random access process;
  • the serving cell where the UE is located is configured with multiple transmitters
  • TRP time advance TA value corresponding to each TRP is independent
  • the UE determines the TRP corresponding to the PDCCH command
  • the UE selects random access resources based on the determined TRP.
  • a dedicated random access resource associated with the determined TRP is selected for the triggered random access process.
  • the determined TRP select the SSB or CSI-RS associated with the determined TRP for the triggered random access process, and set the random access parameter preamble sequence number PREAMBLE_INDEX to the value equal to the selected SSB or CSI-RS The corresponding preamble sequence number.
  • the UE selects random access resources based on the determined TRP only when the determined TRP is the secondary TRP.
  • the UE indicates the random access problem to the upper layer and indicates that the random access is initiated by a certain TRP. Triggered by PDCCH command;
  • the UE indicates the random access problem to the upper layer, and indicates that the random access is triggered for TRP, or indicates that it is associated with TRP. associated;
  • the UE determines that a radio link failure RLF is detected.
  • the number of times the current preamble sequence is sent is equal to the maximum allowed
  • the value of the number of times the preamble sequence is sent is increased by 1, that is, when the variable PREAMBLE_TRANSMISSION_COUNTER is equal to the value of the parameter preambleTransMax plus 1,
  • the UE does not indicate the random access problem to the upper layer
  • the UE does not indicate the random access problem to the upper layer
  • the UE determines that a radio link failure RLF is detected.
  • the UE For a random access process that is not successfully completed, if the random access process is triggered by a PDCCH command, and the triggered PDCCH command is associated with a determined TRP, or if the random access process is triggered for a TRP , or is associated with a TRP, then the UE generates a MAC CE, which indicates the information of the TRP associated with the random access and the information indicating that the random access failure occurred.
  • the TRP corresponding to the PDCCH command is determined by transmitting the configuration indication TCI status.
  • a user equipment including:
  • the above instructions execute the method described above when executed by the above processor.
  • FIG. 1 is a schematic diagram showing uplink transmission under multiple transmitting and receiving nodes (TRP).
  • TRP transmitting and receiving nodes
  • FIG. 2 is a schematic diagram showing the timing advance amount.
  • Figure 3 is a flow chart showing a four-step random access process.
  • Figure 4 is a flow chart showing a two-step random access process.
  • FIG. 5 is a flowchart showing a method executed by user equipment according to an embodiment of the present invention.
  • Figure 6 is a schematic structural block diagram of the user equipment involved in the present invention.
  • UE User Equipment, user equipment
  • NR New Radio, a new generation of wireless technology
  • LTE Long Term Evolution, long-term evolution technology
  • eLTE Enhanced Long Term Evolution, enhanced long-term evolution technology
  • RRC Radio Resource Control, radio resource control (layer);
  • MAC Medium Access Control, media access control (layer);
  • MAC CE MAC Control Element, MAC control element
  • PHY physical layer, physical layer
  • RB radio bearer, wireless bearer
  • DRB Data Radio Bearer, data wireless bearer
  • SRB Signalling Radio Bearer, signaling wireless bearer
  • TCI Transmission Configuration Indicator, transmission configuration indication
  • DCI Downlink Control Information downlink control information
  • RSRP Reference Signal Received Power, reference signal received power
  • PRACH Physical Random Access Channel, physical random access channel
  • PDCCH Physical Downlink Control Channel, physical downlink control channel
  • RA Random Access, random access
  • RAR Random Access Response, random access response
  • TRP Transmit/Receive Point, sending and receiving node
  • SS Synchronization Signal, synchronization signal
  • PBCH Physical Broadcast Channel, physical broadcast channel
  • SSB SS/PBCH block, synchronous broadcast block
  • CSI-RS Channel State Information-Reference Signal channel state information reference signal.
  • the random access process includes a four-step random access process and a two-step random access process.
  • the four-step random access process in the prior art will first be described.
  • the UE performs the 4-step random access process it generally includes the following steps.
  • Step 0 The UE selects random access resources for random access. in this process
  • the UE selects the preamble sequence (preamble) for transmission, and sets the sequence number corresponding to the selected preamble to the value of the parameter PREAMBLE_INDEX;
  • Step 1 The UE sends the selected preamble on the determined PRACH opportunity.
  • Step 2 The UE receives the Random Access Response (RAR) sent from the base station.
  • RAR Random Access Response
  • this RAR carries the sequence number (preamble index id) corresponding to the preamble sent by the UE in step 1, then the UE can determine that the RAR is sent to itself.
  • Such a RAR will carry an uplink grant (UL grant) and a timing advance command (Timing Advance Command).
  • UL grant uplink grant
  • Timing Advance Command timing advance command
  • the UL grant indicates the PUSCH resources used to transmit message 3.
  • the Timing Advance Command indicates the index value T A used to control the amount of timing adjustment (the index value T A used to control the amount of timing adjustment).
  • the UE After receiving the above RAR, the UE will apply the Timing Advance Command to obtain a valid TA value. If this random access process is a random access process based on non-contention collision, for example, a dedicated preamble is provided in the PDCCH order, then at this step, The random access process is considered successfully completed. If not, the UE will continue to perform the following steps, including processing the UL grant carried in the RAR and indicating it to the lower layer. If this is the first time that the UE successfully receives the above RAR, then the UE obtains the MAC PDU for transmission from the multiplexing and assembly entity (Multiplexing and assembly entity) and saves it in the buffer area of message 3 (MSG3buffer).
  • MSG3buffer buffer area of message 3
  • Step 3 The UE sends message 3 on the PUSCH resource indicated by the UL grant.
  • the UE will carry identification information used for contention conflict resolution.
  • Step 4 The UE receives message 4 sent from the base station.
  • message 4 carries the identification information carried by the UE in message 3, then the UE considers that the contention conflict is resolved and the random access process is successfully completed.
  • the “two-step random access process” in the present invention generally includes the following steps.
  • Step 0 The UE selects random access resources for random access. in this process
  • the UE selects the preamble sequence (preamble) for transmission, and sets the sequence number corresponding to the selected preamble to the value of the parameter PREAMBLE_INDEX;
  • Step 1 The UE sends message A (MSG A) to the base station.
  • message A contains the preamble and the payload of message A.
  • the preamble is sent on PRACH, and the payload of message A is sent on PUSCH.
  • the payload of message A is packaged into MAC PDU and transmitted on PUSCH.
  • the payload of message A can carry RRC messages, such as RRC connection establishment request messages, and can also carry user data packets.
  • Step 2 UE receives message B (MSG B) sent by the base station.
  • MSG B message B
  • message B carries information for contention conflict resolution.
  • the UE first sends MSG A, including sending preamble and Send the payload of message A; then the UE receives message B sent by the base station.
  • message B is the response information from the network side/base station to MSG A sent by the UE.
  • the UE determines the transmission opportunity that can be used for message A, the UE obtains the MAC PDU for transmission from the multiplexing and assembly entity (Multiplexing and assembly entity), and saves the obtained MAC PDU in the buffer area.
  • Multiplexing and assembly entity Multiplexing and assembly entity
  • message A contains the preamble sequence transmitted on PRACH and the load information of message A transmitted on PUSCH
  • the following situations can be used as the transmission opportunities for message A, including: UE determines A PUSCH opportunity that can be used to transmit the payload of message A is determined; or the UE determines the next available PRACH opportunity, which is used to transmit the above-mentioned preamble sequence; or the UE selects a preamble sequence and the selected preamble sequence It is used for this random access process; or the preamble sequence selected by the UE is associated with PUSCH or associated with PUSCH timing.
  • the timing advance N TA can be used to calculate the timing advance between downlink and uplink (Timing advance between downlink and uplink).
  • the UE in order to maintain uplink synchronization, the UE needs to start transmitting the i-th uplink frame (Uplink Frame i) some time before the starting position of the i-th downlink frame (Downlink Frame i).
  • the Timing advance command contains an index value, which is recorded as T A and is used to calculate N TA .
  • T A indirectly indicates the value of N TA .
  • each serving cell in order to maintain uplink time alignment (UL time alignment), each serving cell is divided into a TAG, and serving cells with the same time advance belong to the same TAG.
  • each TAG can have its own timer timeAlignmentTimer, which is used to control the effective time of uplink synchronization of the serving cells (Serving Cells) belonging to the TAG.
  • the TA value is updated, the corresponding TAG timeAlignmentTimer will be started or restarted; when the timeAlignmentTimer of a TAG times out, it means that the uplink of the serving cell belonging to the TAG is no longer synchronized.
  • one serving cell may contain more than one TRP, and each TRP has its own corresponding timing advance. Then an implementation method may be that one serving cell may belong to more than one TAG, for example There are two TAGs, each TAG corresponds to a TRP, or each TRP has its own associated TAG. Similarly, each TAG can have its own timeAlignmentTimer.
  • a serving cell belongs to a TAG, but this TAG has more than one TA value.
  • a TAG can have at least two TA values, and each TA value corresponds to or is associated with a TRP.
  • each TA can have its own timeAlignmentTimer, and then the TAG can have multiple timeAlignmentTimers.
  • any of the above methods can be used to manage TA.
  • TRP and TAG/TA correspond to each other, the two terms can be replaced with each other.
  • the TRP corresponding to the PDCCH order that triggers random access is determined, and accordingly the TAG corresponding to the PDCCH order that triggers random access is also determined. .
  • PDCCH order (PDCCH order)
  • a proprietary DCI format is used to characterize PDCCH order. Such DCI is carried in PDCCH and used to trigger the random access process.
  • the random access preamble sequence number (Random access preamble index) can be clearly indicated, and the SS/PBCH sequence number can also be clearly indicated.
  • the base station When the NR system operates in a high frequency band, the base station often cannot send multiple beams covering the entire cell at the same time. Therefore, beam scanning technology is introduced in the NR system to solve the cell coverage problem.
  • the so-called beam scanning means that the base station only sends one or several beam directions at a certain time, and sends different beams at multiple times to cover all directions required for the entire cell.
  • the synchronization broadcast block set is designed for beam scanning and is used to send the primary synchronization signal, secondary synchronization signal and physical broadcast channel required by the UE to search for the cell in each beam direction. These signals
  • the numbers form a synchronous broadcast block (SSB).
  • a synchronous broadcast block set is a collection of multiple synchronous broadcast blocks within a certain time period. In the same period, each synchronous broadcast block corresponds to a beam direction, and the beam direction of each synchronous broadcast block in a synchronous broadcast block set covers the entire cell.
  • one TRP corresponds to some SSBs in the synchronous broadcast block set
  • another TRP corresponds to some SSBs in the set.
  • the SSBs corresponding to the two constitute the complete set of synchronous broadcast block sets, that is, coverage The entire community. Therefore, during the random access process, when selecting random access resources, the UE needs to first determine the beam direction of the random access, that is, determine the SSB.
  • multiple TRPs there can also be a primary TRP (primary TRP) corresponding to all SSBs of the synchronous broadcast block set, achieving coverage of the entire cell, and there are one or more secondary TRPs (Secondary TRP) at the same time.
  • their corresponding beam directions can be partial SSBs, or more subdivided, which can be characterized by CSI-RS, that is, the beam directions corresponding to CSI-RS.
  • TRP and SSB or CSI-RS have a corresponding relationship or are related to each other.
  • This corresponding relationship can be directly reflected in the RRC configuration information. For example, if one or more SSB serial numbers are configured for a TRP, then these SSBs are associated with the TRP; another example is if one or more CSI-SIs are configured for a TRP. RS, then these CSI-RS are associated with the TRP. Such correspondence can also be characterized in an indirect way, such as by TCI states.
  • the UE detects PDCCH on the configured search space.
  • the configuration information of each search space contains information about the control resource set (CORESET) used by the search space.
  • the control resource set provides resource blocks in frequency domain and time domain. Each control resource set is associated with a series of TCI states.
  • Each TCI state contains at least one SSB or CSI-RS information.
  • the set of control resources used in the same search space can be numbered by coresetPoolIndex, where the number value 0 can correspond to the first TRP or primary TRP, and the number value 1 can correspond to the second TRP or secondary TRP. And so on. Therefore, the configuration of the TCI state of the resource set can correspond to the TRP corresponding to the resource set, thereby forming a corresponding relationship between the TRP and SSB or CSI-RS.
  • TRP and TCI state or coresetPoolIndex correspond to each other, Therefore, the two statements can be interchanged. For example, if the TRP corresponding to the PDCCH order that triggers random access is determined, the TCI state or coresetPoolIndex corresponding to the PDCCH order that triggers random access is also determined.
  • the UE performs a 4-step random access process including the following steps:
  • Step S300 The UE selects random access resources for random access. in this process
  • the UE selects the preamble sequence (preamble) for transmission, and sets the sequence number corresponding to the selected preamble to the value of the parameter PREAMBLE_INDEX;
  • Step S301 The UE sends the selected preamble on the determined PRACH opportunity.
  • Step S302 The UE receives a random access response (Random Access Response, RAR) sent from the base station.
  • RAR Random Access Response
  • this RAR carries the sequence number (preamble index id) corresponding to the preamble sent by the UE in step S301, then the UE can determine that the RAR is sent to itself.
  • Such RAR will carry UL grant, indicating the PUSCH resources used to transmit message 3.
  • the RAR also carries the Timing Advance Command , which contains the index value T A used to control the amount of timing adjustment, which is used to control the amount of timing adjustment. Based on the index or corresponding to a valid upstream synchronization time advance TA. When the UE receives such a Timing Advance Command, it will apply the timing advance indicated therein for the subsequent uplink transmission.
  • the UE After receiving the above RAR, the UE will apply the Timing Advance Command to obtain a valid TA value. If this random access process is a random access process based on non-contention conflict, for example, a dedicated preamble is provided in the PDCCH order, then at this step, the random access process is considered to be successfully completed. If not, the UE will continue to perform the following steps.
  • the UE After receiving the above RAR, the UE will process the UL grant carried in the RAR and indicate it to the lower layer. If this is the first time that the UE successfully receives the above RAR, then the UE obtains the MAC PDU for transmission from the multiplexing and assembly entity (Multiplexing and assembly entity) and saves it in the cache of message 3 (MSG3buffer).
  • the variable PREAMBLE_TRANSMISSION_COUNTER is used to record the number of times the preamble is sent, and the parameter preambleTransMax is a preconfigured value, whose value indicates the maximum number of times the preamble is allowed to be sent.
  • Step S303 The UE sends message 3 on the PUSCH resource indicated by the UL grant.
  • the UE will carry identification information used for contention conflict resolution.
  • Step S304 The UE receives message 4 sent from the base station.
  • message 4 carries the identification information carried by the UE in message 3, then the UE considers that the contention conflict is resolved and the random access process is successfully completed.
  • the above four-step random access procedure may also be called a first type of layer 1 random access (Type-1 layer 1 Random Access Procedure, type 1 L1 RA).
  • Type-1 layer 1 Random Access Procedure type 1 L1 RA
  • the type 1 L1 RA process at least includes the transmission of the random access preamble sequence (or transmission of message one) on the PRACH, and the random access response Transmission/reception of the message (Random Access Response Message).
  • the transmission of this random access response message is scheduled by the PDCCH and is transmitted on the PDSCH; in addition,
  • the type 1 L1 RA process may also include the PUSCH scheduled by the uplink grant carried in the random access response, and the subsequent PDSCH used for contention resolution.
  • the two-step random access process includes the following steps:
  • Step S400 The UE selects random access resources for random access. in this process
  • the UE selects the preamble sequence (preamble) for transmission, and sets the sequence number corresponding to the selected preamble to the value of the parameter PREAMBLE_INDEX;
  • Step S401 The UE sends message A (MSG A) to the base station.
  • message A contains the preamble and the payload of message A.
  • the preamble is sent on PRACH, and the payload of message A is sent on PUSCH.
  • the payload of message A is packaged into MAC PDU and transmitted on PUSCH.
  • Step S402 The UE receives message B (MSG B) sent by the base station.
  • message B carries information for contention conflict resolution.
  • the network can be a long-term evolution LTE network, a new radio access technology (New RAT, NR) network, an enhanced long-term evolution eLTE network, or a subsequent evolved version of 3GPP. other networks defined in .
  • New RAT new radio access technology
  • eLTE enhanced long-term evolution eLTE network
  • This embodiment provides a method executed by user equipment, as shown in Figure 5, including the following steps.
  • Step S501 The UE receives the PDCCH order from the base station and triggers the random access process.
  • Step S502 Upon receiving the PDCCH order, when the serving cell where the UE is located is configured with multiple transmitting and receiving nodes TRP and the TA value corresponding to each TRP is independent, the UE determines the TRP corresponding to the PDCCH order.
  • Step S503 The UE selects random access resources based on the determined TRP.
  • the UE when receiving the PDCCH order, the UE can determine whether the PDCCH order comes from a specific TRP.
  • the UE is configured with multiple TRPs in the serving cell, and the TA value corresponding to each TRP is independent (it can also be understood that the UE is configured with multiple TA values in the serving cell, or Multiple TAGs are configured (in the following, these terms are interchangeable), then when the UE receives the PDCCH order, it needs to determine which TRP the PDCCH order is associated with, or which TA value/TAG it is associated with.
  • the UE does not have the aforementioned multiple TRPs configured in the serving cell, then the UE does not need to make the above judgment.
  • the UE can determine the TRP corresponding to the PDCCH order, and it can be considered that the random access process triggered by the PDCCH order also corresponds to the TRP, or is associated with the determined TRP.
  • Random Access Resource selection Random Access Resource selection
  • the UE selects the SSB indicated by the PDCCH order. If the PDCCH used for PDCCH order indication does not clearly indicate the sequence number of the RA preamble sequence, then the UE further determines Whether dedicated random access resources are configured. specifically,
  • the PDCCH used for PDCCH order indication clearly indicates the sequence number of the RA preamble sequence (ra-PreambleIndex), and the value of this clearly indicated ra-PreambleIndex is not equal to 0b000000, then the UE can set The value of the parameter PREAMBLE_INDEX in the random access process is the indicated ra-PreambleIndex, and the SSB indicated in the PDCCH is selected.
  • the PDCCH used for PDCCH order indication does not clearly indicate the sequence number of the RA preamble sequence, or the sequence number of the indicated RA preamble sequence is 0b000000, then the UE needs to use other methods to select the RA. resource.
  • the UE further determines whether it is configured with dedicated random access resources.
  • the dedicated random access resources at least include configuration information of contention-free Random Access Resources based on non-contention conflicts, and
  • the configured random access resources are associated with SSB or associated with CSI-RS.
  • the configured dedicated RACH resources are associated with TRP. Then based on the previously determined TRP, the UE first needs to select the dedicated random access resources associated with the determined TRP for resource selection of the triggered random access process. If the configured dedicated random access resources are associated with other TRPs, they should not be used for resource selection for this random access, because the triggered random access procedure is associated with a certain TRP. of.
  • the dedicated random resource associated with the determined TRP if there is an SSB (or CSI-RS) that meets the level condition, then one of the SSBs (or CSI-RS) that meets the condition is selected, and set
  • the value of the parameter PREAMBLE_INDEX is the ra-PreambleIndex corresponding to the SSB (or CSI-RS).
  • the configured dedicated random access resources are not associated with the TRP. Then when selecting resources for the random access process in the dedicated random access resources, in addition to meeting the aforementioned level requirements, the selected SSB (or CSI-RS) also needs to meet another condition, which is this SSB (or CSI-RS) needs to be associated with a certain TRP. Then select one of the SSBs (or CSI-RS) that meets the conditions, and set the value of the parameter PREAMBLE_INDEX to the ra-PreambleIndex corresponding to the SSB (or CSI-RS).
  • the UE is not configured with the aforementioned dedicated random access resources, or no SSB or CSI-RS that meets the conditions is found in the aforementioned configured dedicated random access resources. , then the UE needs to use other methods to select random access resources.
  • the UE can select a suitable SSB on the SSB associated with the previously determined TRP.
  • the so-called suitable means that the SSB at least meets the requirements of the level value; if If there is no SSB that meets the level value requirements, the UE can select any SSB from the SSB associated with the previously determined TRP.
  • the UE can always select the preamble in Random Access Preambles group A and set the value of the parameter PREAMBLE_INDEX to the sequence number (index) of the selected preamble.
  • the UE can select an appropriate CSI-RS on the CSI-RS associated with the previously determined TRP.
  • Suitability means that the CSI-RS can meet the level value requirements. If there is no CSI-RS that meets the level value requirements, the UE can select any CSI-RS from the CSI-RS associated with the previously determined TRP.
  • the UE can set the value of the parameter PREAMBLE_INDEX to the corresponding preamble sequence number (index) according to the corresponding random access resources;
  • the UE may select an SSB that is quasi-colocated with the CSI-RS. Then select the leader sequence according to the method described in 3.1.
  • Embodiment 1 The difference from Embodiment 1 is that the UE only performs the operations in Embodiment 1 when the determined TRP is the second TRP.
  • the specific implementation is as follows:
  • the UE receives the PDCCH order and triggers the random access process.
  • the UE When receiving the PDCCH order, the UE can determine whether the PDCCH order comes from a specific TRP.
  • the UE is configured with at least two TRPs in the serving cell, and the TA value corresponding to each TRP is independent (it can also be understood that the UE is configured in the serving cell). If multiple TA values are set, or multiple TAGs are configured (in the following, these terms can be interchanged), then when the UE receives the PDCCH order, it needs to determine which TRP the PDCCH order is associated with, or which TRP it is associated with. A TA value/TAG association. Take two TRPs as an example, one is called primary TRP and the other is called secondary TRP.
  • the UE When the UE determines that the TRP corresponding to the PDCCH order is the primary TRP, the UE can perform operation 1 in selecting random access resources. As a supplement, in another case, the UE is not configured with the aforementioned multiple TRPs in the serving cell, then the UE does not need to make the above judgment, and the UE can perform operations in random access resource selection. one.
  • the UE When the UE determines that the TRP corresponding to the PDCCH order is a secondary TRP, the UE can perform operation 2 in selecting random access resources.
  • the PDCCH order clearly indicates the sequence number of the RA preamble sequence (ra-PreambleIndex), and the value of this clearly indicated ra-PreambleIndex is not equal to 0b000000, then the UE can set the The value of the parameter PREAMBLE_INDEX is the indicated ra-PreambleIndex, and the SSB indicated in the PDCCH order is selected.
  • the PDCCH order does not clearly indicate the sequence number of the RA preamble sequence, or the indicated sequence number of the RA preamble sequence is 0b000000, then the UE needs to use other methods to select RA resources.
  • the UE further determines whether it is configured with dedicated random access resources.
  • the dedicated random access resources at least include configuration information of contention-free Random Access Resources based on non-contention conflicts, and
  • the configured random access resources are associated with SSB or associated with CSI-RS.
  • the configured dedicated random resources if there is an SSB (or CSI-RS) that meets the level conditions, then select one of the SSBs (or CSI-RS) that meets the conditions and set the value of the parameter PREAMBLE_INDEX is the ra-PreambleIndex corresponding to the SSB (or CSI-RS).
  • the UE selects a suitable SSB on the SSB.
  • Suitability means that the SSB at least meets the level value requirements; if there is no SSB that meets the level value requirements, the UE can select any one from all SSBs. SSB.
  • Operation 2 As shown in Embodiment 1, the determined TRP is the secondary TRP.
  • the UE can indicate the random access problem (Random) to the upper layer of the UE's MAC layer (such as the RRC layer) access problem).
  • the UE can indicate the random access problem (Random access problem) to the upper layer and indicate that the random access is Triggered by PDCCH order from a certain TRP;
  • the UE indicates the random access problem (Random access problem) to the upper layer and indicates that the random access is triggered for TRP. , or the indication is associated with a TRP;
  • the UE may directly indicate random access issues to upper layers.
  • the upper layer of the UE receives a random access problem indication from the lower layer. If the random access is not triggered by the PDCCH order from TRP or is not triggered for TRP, then the UE considers that a radio link failure has been detected (consider radio link failure to be detected); otherwise, the UE does not think that RLF is detected.
  • the upper layer of the UE such as the RRC layer, receives a random access problem indication from the lower layer. Except when the random access is triggered by the PDCCH order from the TRP or is triggered by the TRP, the UE always thinks that the detection The wireless link failed.
  • Embodiment 3 can be used in combination with Embodiments 1 and 2, or can be used alone to manage random access issues associated with TRP.
  • the UE can use different processing for random access triggered by primary TRP and secondary TRP.
  • the UE directly indicates the random access problem to the upper layer; when the upper layer receives the indication, it considers that a wireless link failure has been detected, which can trigger the RRC connection re-establishment process;
  • the UE If the random access is triggered by the secondary TRP, then the UE indicates to the upper layer the random access problem triggered by the secondary TRP; when the upper layer receives the indication, it does not consider that a wireless link failure has been detected.
  • the UE when the upper layer receives a random access problem indication from the lower layer, if the indication is not associated with the secondary TRP, or is not a random access problem triggered by the secondary TRP, then the UE considers that a wireless link failure has been detected.
  • the UE when the upper layer receives a random access problem indication from the lower layer, in addition to the random access problem triggered by the secondary TRP, the UE always thinks that a wireless link failure has been detected.
  • Embodiment 3 when the UE determines the reason for triggering the random access process, if the random access process is triggered by PDCCH order, and the triggered PDCCH order is associated with the determined TRP, then the UE does not Layer indicates random access problem (Random access problem);
  • the UE does not indicate the random access problem (Random access problem) to the upper layer;
  • the UE may directly indicate random access issues to upper layers.
  • the upper layer of the UE such as the RRC layer, considers that a Radio Link Failure is detected when receiving a random access problem indication from the lower layer.
  • the UE can generate a MAC CE, in which the information of the TRP associated with the random access can be indicated, and the information of a random access failure can also be indicated. The UE then sends the MAC CE to the base station.
  • how the UE determines the TRP corresponding to the PDCCH order can be accomplished in the following ways:
  • Method 1 is determined by the CORESETPoolIndex corresponding to the configured ControlResourceSet of the search space used to receive PDCCH.
  • the PDCCH received by the UE on the ControlResourceSet corresponding to the CORESETPoolIndex value of 0 in the search space can be TRP-1; and the PDCCH received by the UE on the search space corresponding to the resource with the CORESETPoolIndex value of 1
  • the corresponding TRP of PDCCH may be TRP-2.
  • the PDCCH received by the UE on the ControlResourceSet corresponding to the CORESETPoolIndex value of 1 in the search space (such a Coreset can be called the second CORSET), and its corresponding TRP can be the secondary TRP or the second TRP; and the UE is in
  • the corresponding TRP of the PDCCH received on the ControlResourceSet corresponding to the CORESETPoolIndex that has not been assigned a value in the search space (such a Coreset can be called the first CORSET) can be the primary TRP or the first TRP.
  • Method two is determined by TCI state.
  • the corresponding TRP is the TRP configured with the TCI state.
  • the TRP corresponding to the PDCCH order may also be determined based on the received TCI state indicated in the DCI format used for the PDCCH order.
  • all TCI states configured for the UE can be divided into several groups or sets, and each group or set can correspond to a TRP. Then the TRP can be determined based on the TCI state set to which the received TCI state indicated in the DCI format for PDCCH order belongs. Or the TRP is determined based on the activation of the TCI state to which the TCI state used to receive the PDCCH belongs.
  • the DCI format used for PDCCH order carries indication information to indicate the TRP corresponding to the PDCCH order. For example, when the value of the TRP field is set to 0, it corresponds to TRP-1, and when the value is 1, it corresponds to TRP-2.
  • this article does not limit the UE to determine the TRP corresponding to the PDCCH order through other methods.
  • Figure 6 is a schematic structural block diagram of the user equipment involved in the present invention.
  • the user equipment 600 at least includes a processor 601 and a memory 602 .
  • the processor 601 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like.
  • the memory 602 may include, for example, volatile memory (such as random access memory RAM), hard disk drive (HDD), non-volatile memory (such as flash memory), or other memory systems.
  • Memory 602 stores program instructions. When this instruction is executed by the processor 601, it may execute one or several steps in the UE processing method of the present disclosure.
  • the user equipment shown above may include more modules, for example, it may also include modules that may be developed or developed in the future and may be used for base stations, MMEs, or UEs, and so on.
  • the various identifications shown above are only illustrative and not restrictive, and the present disclosure is not limited to the specific information elements as examples of these identifications. Based on the teachings of the illustrated embodiments, those skilled in the art can Many changes and modifications were made.
  • various components inside the base station and user equipment in the above embodiments can be implemented by a variety of devices, including but not limited to: analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, programmable processing processor, application specific integrated circuit (ASIC), field programmable gate array (FPGA), programmable logic device (CPLD), etc.
  • DSP digital signal processing
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • CPLD programmable logic device
  • the program running on the device according to the present invention may be a program that causes the computer to implement the functions of the embodiments of the present invention by controlling a central processing unit (CPU).
  • the program or information processed by the program may be temporarily stored in volatile memory (such as random access memory RAM), hard disk drive (HDD), non-volatile memory (such as flash memory), or other memory systems.
  • Programs for realizing the functions of each embodiment of the present invention can be recorded on a computer-readable recording medium.
  • Corresponding functions can be realized by causing the computer system to read programs recorded on the recording medium and execute these programs.
  • the so-called “computer system” here may be a computer system embedded in the device, which may include an operating system or hardware (such as peripheral devices).
  • the "computer-readable recording medium” may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a short-term dynamic storage program recording medium, or any other recording medium readable by a computer.
  • circuits eg, single-chip or multi-chip integrated circuits.
  • Circuitry designed to perform the functions described in this specification may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field-programmable gate array
  • a general-purpose processor can be a microprocessor or any existing processor, controller, microcontroller, or state machine.
  • the above circuit may be a digital circuit or an analog circuit.
  • the present invention is not limited to the above-described embodiment. Although the embodiments have been described various examples, but the present invention is not limited thereto.
  • Fixed or non-mobile electronic equipment installed indoors or outdoors can be used as terminal equipment or communication equipment, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

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Abstract

本发明提供一种由用户设备执行的方法及用户设备，该方法包括如下步骤：用户设备UE接收来自基站的物理下行控制信道PDCCH命令，触发随机接入过程；在接收到PDCCH命令时，当UE所在的服务小区被配置了多个发送接收节点TRP且每个TRP对应的时间提前量TA值是独立的情况下，UE确定该PDCCH命令对应的TRP；UE根据确定的TRP进行随机接入资源的选择。

Description

由用户设备执行的方法及用户设备 技术领域
本发明涉及无线通信技术领域，更具体地，本发明涉及由用户设备执行的方法以及相应的用户设备。
背景技术
为了进一步增强NR技术中上行发送和接收的性能，第三代合作伙伴计划(3GPP)拟研究多个发送接收节点(TRP)下的上行传输。在一个服务小区中，可以布置多于一个的发送和接收节点TRP，由每个TRP向同一个UE提供服务，如图1所示。由于不同TRP和UE的物理距离不同，导致传播时延不同，从而使得UE在针对不同TRP发送时采用的时间提前量(Timing Advance)的取值是不同的。在现有技术中，UE接收到来自网络层的PDCCH命令(PDCCH order)可以触发一个随机接入过程，并在该过程中获得有效的TA值，从而对其维护的时间提前量进行更新。在现有技术中，UE在一个服务小区上仅和一个TRP进行交互，维护一个TA值；随着多个TRP的引入，UE如何维护多个TA值是需要解决的问题。
发明内容
为了解决上述问题，本发明提供一种即使UE在一个服务小区上被配置了多个TRP的情况下也能够有效地维护多个TA值从而可靠地进行多个TRP下的上行传输的由用户设备执行的方法以及相应的用户设备。
根据本发明的一个方面，提供了一种由用户设备执行的方法，包括如下步骤：
用户设备UE接收来自基站的物理下行控制信道PDCCH命令，触发随机接入过程；
在接收到PDCCH命令时，当UE所在的服务小区被配置了多个发 送接收节点TRP且每个TRP对应的时间提前量TA值是独立的情况下，UE确定该PDCCH命令对应的TRP；
UE根据确定的TRP进行随机接入资源的选择。
在上述的由用户设备执行的方法中，优选地，还包括如下步骤：
根据确定的TRP，选择与确定的TRP相关联的、专有的随机接入资源用于被触发的随机接入过程。
在上述的由用户设备执行的方法中，优选地，还包括如下步骤：
根据确定的TRP，选择与确定的TRP相关联的SSB或者CSI-RS用于被触发的随机接入过程，并且设置随机接入参数前导序列序号PREAMBLE_INDEX的取值等于选定的SSB或者CSI-RS对应的前导序列序号。
在上述的由用户设备执行的方法中，优选地，
UE仅在确定的TRP是辅TRP时才根据确定的TRP进行随机接入资源的选择。
在上述的由用户设备执行的方法中，优选地，还包括如下步骤：
在UE启动的随机接入过程中，当前导序列发送的次数等于最多允许前导序列发送次数的取值加1时，即，当变量PREAMBLE_TRANSMISSION_COUNTER等于参数preambleTransMax取值再加1时，
如果该随机接入过程是PDCCH命令触发的，且该触发的PDCCH命令是和确定的TRP相关联的，那么UE向上层指示随机接入问题，以及指示该随机接入是由来自某一个TRP的PDCCH命令触发的；
如果该随机接入过程是为TRP而触发的，或者是与确定的TRP相关联的，那么UE向上层指示随机接入问题，以及指示该随机接入是为TRP触发的，或者指示是与TRP相关联的；
在UE的上层接收到来自下层的随机接入问题指示时，如果该随机接入不是由来自TRP的PDCCH命令触发或者不是为TRP而触发的，那么UE判断为检测到无线链路失败RLF。
在上述的由用户设备执行的方法中，优选地，还包括如下步骤：
在UE启动的随机接入过程中，当前导序列发送的次数等于最多允 许前导序列发送次数的取值加1时，即，当变量PREAMBLE_TRANSMISSION_COUNTER等于参数preambleTransMax取值再加1时，
如果该随机接入过程是PDCCH命令触发的，且该触发的PDCCH命令是和确定的TRP相关联的，那么UE不向上层指示随机接入问题；
如果该随机接入过程是为TRP而触发的，或者是与TRP相关联的，那么UE不向上层指示随机接入问题；
在UE的上层接收到来自下层的随机接入问题指示时，UE判断为检测到无线链路失败RLF。
在上述的由用户设备执行的方法中，优选地，还包括如下步骤：
对于没有成功完成的随机接入过程，如果该随机接入过程是PDCCH命令触发的，且该触发的PDCCH命令是和确定的TRP相关联的，或者如果该随机接入过程是为TRP而触发的，或者是与TRP相关联的，那么UE生成MAC CE，在该MAC CE中指示了与该随机接入关联的TRP的信息，以及指示了发生随机接入失败的信息。
在上述的由用户设备执行的方法中，优选地，还包括如下步骤：
通过传输配置指示TCI状态来确定PDCCH命令对应的TRP。
根据本发明的另一个方面，提供了一种用户设备，包括：
处理器；以及
存储器，存储有指令，
其中，上述指令在由上述处理器运行时执行上文所描述的方法。
根据本发明所涉及的由用户设备执行的方法以及相应的用户设备，即使UE在一个服务小区上被配置了多个TRP的情况下，也能够有效地维护多个TA值，从而能够可靠地进行多个TRP下的上行传输。
附图说明
图1是表示多个发送接收节点(TRP)下的上行传输的示意图。
图2是表示时间提前量的示意图。
图3是表示四步随机接入过程的流程图。
图4是表示两步随机接入过程的流程图。
图5是表示本发明的一个实施例涉及的由用户设备执行的方法的流程图。
图6是本发明所涉及的用户设备的简要结构框图。
具体实施方式
下面结合附图和具体实施方式对本发明进行详细阐述。应当注意，本发明不应局限于下文所述的具体实施方式。另外，为了简便起见，省略了对与本发明没有直接关联的公知技术的详细描述，以防止对本发明的理解造成混淆。
在具体描述之前，先对本发明中提到的若干术语做如下说明。除非另有指出，本发明中涉及的术语都具有下文的含义。
UE：User Equipment，用户设备；
NR：New Radio，新一代无线技术；
LTE：Long Term Evolution，长期演进技术；
eLTE：Enhaced Long Term Evolution，增强的长期演进技术；
RRC：Radio Resource Control，无线资源控制(层)；
MAC：Medium Access Control，媒体接入控制(层)；
MAC CE：MAC Control Element，MAC控制元素；
PHY：physical layer，物理层；
RB：radio bearer，无线承载；
DRB：Data Radio Bearer，数据无线承载；
SRB：Signalling Radio Bearer，信令无线承载；
TCI：Transmission Configuration Indicator，传输配置指示；
DCI：Downlink Control Information下行控制信息
RSRP：Reference Signal Received Power，参考信号接收功率；
PRACH：Physical Random Access Channel，物理随机接入信道；
PDCCH：Physical Downlink Control Channel，物理下行控制信道；
RA：Random Access，随机接入；
RAR：Random Access Response，随机接入响应；
TRP：Transmit/Receive Point，发送接收节点；
SS：Synchronization Signal，同步信号；
PBCH：Physical Broadcast Channel，物理广播信道；
SSB：SS/PBCH block，同步广播块；
CSI-RS：Channel State Information-Reference Signal信道状态信息参考信号。
以下，对本发明的相关技术给出说明。
随机接入过程Random Access procedure
随机接入过程包含四步随机接入过程和两步随机接入过程。
四步随机接入过程
以下，首先对现有技术中的四步随机接入过程进行说明。UE在执行4步随机接入过程时，一般包含下述步骤。
步骤0：UE选定用于随机接入的随机接入资源。在这一过程中
-UE选定了用于发送的前导序列(preamble)，将选定的preamble对应的序号设置为参数PREAMBLE_INDEX的值；以及
-在多个PRACH时机(PRACH occasions)中确定下一个可以用于传输的PRACH时机(determine the next available PRACH occasion from the PRACH occasions)。
步骤1：UE在确定的PRACH时机上发送选定的preamble。
步骤2：UE接收基站侧发来的随机接入响应(Random Access Response，RAR)。
如果在这个RAR中携带了UE在步骤1中发送的preamble对应的序号(preamble index id)，那么UE可以确定该RAR是发送给自己的。
在这样的RAR中会携带上行授权(UL grant)以及时间提前量命令(Timing Advance Command)。
其中，该UL grant指示了用于传输消息3的PUSCH资源。Timing Advance Command中指示了用于控制时间调整量的TA值的序号值(the index value TAused to control the amount of timing adjustment)。
当接收到上述的RAR之后，UE会应用该Timing Advance Command，获得有效的TA值。如果这个随机接入过程是基于非竞争冲突的随机接入过程，例如在PDCCH order中提供专有的preamble，那么到这一步， 随机接入过程就认为成功完成了。如果不是，那么UE会继续执行下述步骤，包含处理RAR中携带的UL grant，并将它指示给下层。如果这是UE第一次成功的接收到上述RAR，那么UE从复用和组装实体(Multiplexing and assembly entity)中获取(obtain)用于发送的MAC PDU，并将它保存在消息3的缓存区(MSG3buffer)中。
步骤3：UE在UL grant指示的PUSCH资源上发送消息3。
在这个消息3中，UE会携带用于竞争冲突解决的标识信息。
步骤4：UE接收基站侧发送来的消息4。
在消息4中如果携带了UE在消息3中携带的标识信息，那么UE认为竞争冲突解决，随机接入过程成功完成。
由于在上述随机接入过程中UE经历了步骤1-4的消息传递过程，因此被称为“四步随机接入”(4-step RA)过程。
两步随机接入过程
其次，对本发明所涉及的“两步随机接入过程”进行详细说明。本发明中的“两步随机接入过程”一般包含如下步骤。
步骤0：UE选定用于随机接入的随机接入资源。在这一过程中
-UE选定了用于发送的前导序列(preamble)，将选定的preamble对应的序号设置为参数PREAMBLE_INDEX的值；
-在多个PRACH时机(PRACH occasions)中确定下一个可以用于传输的PRACH时机(determine the next available PRACH occasion from the PRACH occasions)；以及
-确定对应于该前导序列的PUSCH资源。
步骤1：UE向基站发送消息A(MSG A)。
其中，消息A包含preamble和消息A的负载(payload)。
其中，preamble在PRACH上发送，消息A的payload在PUSCH上发送。消息A的payload是被包装成MAC PDU在PUSCH上传输。消息A的payload中可以携带RRC消息，例如RRC连接建立请求消息，还可以携带用户数据包。
步骤2：UE接收基站发送的消息B(MSG B)。
其中，消息B携带了用于竞争冲突解决的信息。
从时间顺序上来看，UE首先发送MSG A，包含发送preamble以及 发送消息A的负载；然后UE接收到基站发送的消息B。消息B是网络侧/基站对UE发送的MSG A的响应信息。
此外，在UE确定了能用于消息A的传输时机时，UE从复用和组装实体(Multiplexing and assembly entity)中获取用于发送的MAC PDU，并将获取的MAC PDU保存在缓存区。
由于消息A中包含了在PRACH传输的前导序列，以及在PUSCH上传输的消息A的负载信息，因此作为可用于消息A的传输时机，例如可以将如下的情况作为上述传输时机，包括：UE确定了能用于传输消息A的负载的PUSCH时机；或者UE确定了下一个能用的PRACH时机，该PRACH时机用于传输上述前导序列；或者UE选定了一个前导序列并且所选定的前导序列是用于本次随机接入过程；或者UE选定的前导序列关联着PUSCH或关联着PUSCH时机。
时间提前量NTA
时间提前量NTA可以用于计算上行和下行之间的时间提前值(Timing advance between downlink and uplink)。
如图2所示，为了保持上行同步，UE需要在第i个下行帧(Downlink Frame i)的起始位置之前的一段时间开始第i个上行帧(Uplink Frame i)传输。这段时间可以由时间提前值TTA表征，TTA＝(NTA+NTA，offset)*Tc，其中Tc是与载波频率相关的时间参数。
Timing advance command中包含着一个索引值(index value)，这个索引值被记为TA，用于计算NTA。在接收到包含在随机接入响应的Timing advance command时，UE可以根据其中的TA来计算NTA的取值。或者说是TA间接指示了NTA的值。
时间提前量分组(Timing Advance Group)
在现有技术中为了维护上行时间一致(UL time alignment)，每个服务小区都会划分到一个TAG，时间提前量相同的服务小区属于同一个TAG。为了管理TA值的有效性，每一个TAG可以有自己的定时器timeAlignmentTimer，用于控制属于该TAG的服务小区(Serving Cells)的上行同步的有效时间。当TA值被更新时，对应的TAG的 timeAlignmentTimer会被启动或者重启；当一个TAG的timeAlignmentTimer运行超时，表示属于该TAG的服务小区的上行不再同步。
在多TRP的场景下，一个服务小区可以包含多于一个的TRP，而每个TRP有自己对应的时间提前量，那么一种实施方式可以是一个服务小区可以属于多于一个的TAG，例如可以有两个TAG，每个TAG对应于一个TRP，或者说每个TRP有自己关联的TAG。类似的，每个TAG可以有自己的timeAlignmentTimer。
还有一种实施方式是一个服务小区属于一个TAG，但是这个TAG有多于一个的TA值，例如一个TAG可以有至少两个TA值，每个TA值对应或者关联一个TRP。类似的每个TA可以有自己的timeAlignmentTimer，那么该TAG可以有多个timeAlignmentTimer。
在本文中，对于TA的管理可以采用上述的任一方式。
在本文中，由于TRP和TAG/TA相互对应，因此两者说法可以相互替换，例如确定了触发随机接入的PDCCH order对应的TRP，相应的也确定了触发随机接入的PDCCH order对应的TAG。
PDCCH命令(PDCCH order)
一种专有的DCI格式用于表征PDCCH order，这样的DCI携带在PDCCH中，用来触发随机接入过程。在这样的DCI格式中，可以明确的指示随机接入前导序列的序号(Random access preamble index)，还可以明确的指示SS/PBCH序号。
同步广播块SSB
当NR系统工作在高频段时，基站往往不能同时发送多个覆盖整个小区的波束，因此NR系统中引入了波束扫描技术来解决小区覆盖的问题。
所谓波束扫描是指基站在某一个时刻只发送一个或几个波束方向，通过多个时刻发送不同波束覆盖整个小区所需要的所有方向。同步广播块集合就是针对波束扫描而设计的，用于在各个波束方向上发送UE搜索小区所需要的主同步信号、辅同步信号以及物理广播信道，而这些信 号就组成了一个同步广播块(SSB)。同步广播块集合是一定时间周期内多个同步广播块的集合，在同一周期内每个同步广播块对应一个波束方向，且一个同步广播块集合的各个同步广播块的波束方向覆盖了整个小区。
在多个TRP场景下，可以认为一个TRP对应了同步广播块集合中的部分SSB，而另外一个TRP对应了集合中的部分SSB，两者对应的SSB构成了同步广播块集合的全集，即覆盖了整个小区。所以在随机接入过程中，UE在选择随机接入资源时，需要首先确定随机接入的波束方向，即确定SSB。
在多个TRP(multiple TRPs)场景下，还可以是一个主TRP(primary TRP)对应了同步广播块集合的所有SSB，实现了整个小区的覆盖，同时存在一个或多个辅TRP(Secondary TRP)，它们对应的波束方向可以是部分的SSB，或者是更为细分，可以通过CSI-RS来表征，即对应于CSI-RS的波束方向。
所以可以认为TRP和SSB或者CSI-RS存在的对应关系，或者是相互关联的。
这种对应关系在RRC配置信息中可以直接体现，例如为一个TRP配置了一个或者多个SSB的序号，那么这些SSB就是与该TRP关联的；又例如为一个TRP配置了一个或者多个CSI-RS，那么这些CSI-RS就是与该TRP相关联的。这样的对应关系还可以通过间接的方式来表征，例如通过TCI状态(TCI states)来表征。UE在配置的搜索空间(search space)上检测PDCCH。每个搜索空间的配置信息中包含了该搜索空间所使用的控制资源集合(Control Resource Set，CORESET)的信息。控制资源集合提供了频域和时域的资源块。每个控制资源集合关联着一系列的TCI state。在每个TCI state至少包含了一个SSB或者CSI-RS的信息。用于同一搜索空间的控制资源集合可以由coresetPoolIndex来编号，其中编号取值为0的可以对应着第一TRP或者是primary TRP，编号取值为1的可以对应着第二TRP或者是secondary TRP，以此类推。因此通过资源集合的TCI state的配置就可以与该资源集合对应的TRP相对应，进而使得TRP和SSB或者CSI-RS形成对应关系。
在本文中，由于TRP和TCI state或者coresetPoolIndex相互对应， 因此两者说法可以相互替换，例如确定了触发随机接入的PDCCH order对应的TRP，相应的也确定了触发随机接入的PDCCH order对应的TCI state或者coresetPoolIndex。
四步随机接入过程(4 step Random Access procedure，4-step RA)
下面参照附图进行说明，具体地，如图3所示，UE执行4步随机接入过程包含下述步骤：
步骤S300：UE选定用于随机接入的随机接入资源。在这一过程中
-UE选定了用于发送的前导序列(preamble)，将选定的preamble对应的序号设置为参数PREAMBLE_INDEX的值；以及
-在多个PRACH时机(PRACH occasions)中确定下一个可以用于传输的PRACH时机(determine the next available PRACH occasion from the PRACH occasions)。
步骤S301：UE在确定的PRACH时机上发送选定的preamble。
步骤S302：UE接收基站侧发来的随机接入响应(Random Access Response，RAR)。
如果在这个RAR中携带了UE在步骤S301中发送的preamble对应的序号(preamble index id)，那么UE可以确定该RAR是发送给自己的。
在这样的RAR中会携带UL grant，指示用于传输消息3的PUSCH资源。
在RAR中还会携带Timing Advance Command(时间提前量调整指示)，包含了用于控制时间调整量的TA值的序号值(the index value TA used to control the amount of timing adjustment)，该值用于索引或者对应一个有效的上行同步时间提前量TA。UE在接收到这样的Timing Advance Command时，会应用里面指示的时间提前量，用于接下来的上行传输。
当接收到上述的RAR之后，UE会应用该Timing Advance Command，获得有效的TA值。如果这个随机接入过程是基于非竞争冲突的随机接入过程，例如在PDCCH order中提供了专有的preamble，那么到这一步，随机接入过程就认为成功完成了。如果不是，那么UE会继续执行下述步骤。
当接收到上述的RAR之后，UE会处理RAR中携带的UL grant，并将它指示给下层。如果这是UE第一次成功的接收到上述RAR，那么UE从复用和组装实体(Multiplexing and assembly entity)中获取(obtain)用于发送的MAC PDU，并将它保存在消息3的缓存区(MSG3buffer)中。
如果UE在预定时间内没有接收到上述RAR，那么UE会将变量PREAMBLE_TRANSMISSION_COUNTER的值增加1，该变量的初始值为0。如果PREAMBLE_TRANSMISSION_COUNTER＝preambleTransMax+1，那么UE认为随机接入过程没有成功完成，可以向上层指示随机接入问题。其中变量PREAMBLE_TRANSMISSION_COUNTER用于记录preamble的发送次数，参数preambleTransMax为预配置的值，其取值表示preamble最多允许发送的次数。
步骤S303：UE在UL grant指示的PUSCH资源上发送消息3。
在这个消息3中，UE会携带用于竞争冲突解决的标识信息。
步骤S304：UE接收基站侧发送来的消息4。
在消息4中如果携带了UE在消息3中携带的标识信息，那么UE认为竞争冲突解决，随机接入过程成功完成。
如果UE在预定时间内没有接收到上述消息4，那么UE会将变量PREAMBLE_TRANSMISSION_COUNTER的值增加1，该变量的初始值为0。如果PREAMBLE_TRANSMISSION_COUNTER＝preambleTransMax+1，那么UE认为随机接入过程没有成功完成，可以向上层指示随机接入问题。
由于在上述随机接入过程中UE经历了步骤S301～S304的消息传递过程，因此被称为“四步随机接入”(4-step RA)过程。
上述四步随机接入过程还可以被称为是第一类型的层1随机接入(Type-1 layer 1 Random Access Procedure，type 1 L1 RA)。从物理层(又称为层1，layer 1)的角度来看，type 1 L1 RA过程至少包含了在PRACH上传输随机接入前导序列(或者称为消息一的传输)，以及随机接入响应消息(Random Access Response Message)的传输/接收，这个随机接入响应消息的传输是由PDCCH调度的，并且是在PDSCH上传输的；此外， 在type 1 L1 RA过程中还可以包含随机接入响应中携带的上行授权所调度的PUSCH，以及随之而来的用于竞争冲突解决(contention resolution)的PDSCH。
两步随机接入过程(2 step Random Access procedure，2-step RA)
下面参照附图进行说明，具体地，如图4所示，两步随机接入过程包含下述步骤：
步骤S400：UE选定用于随机接入的随机接入资源。在这一过程中
-UE选定了用于发送的前导序列(preamble)，将选定的preamble对应的序号设置为参数PREAMBLE_INDEX的值；
-在多个PRACH时机(PRACH occasions)中确定下一个可以用于传输的PRACH时机(determine the next available PRACH occasion from the PRACH occasions)；以及
-确定对应于该前导序列的PUSCH资源。
步骤S401：UE向基站发送消息A(MSG A)。
其中，消息A包含preamble和消息A的负载(payload)。
其中，preamble在PRACH上发送，消息A的payload在PUSCH上发送。消息A的payload是被包装成MAC PDU在PUSCH上传输。当UE确定了用于发送消息A的时机时，如果这是UE第一次发送MSG A，那么UE从复用和组装实体(Multiplexing and assembly entity)中获取(obtain)用于发送的MAC PDU，并将它保存在消息A的缓存区(MSGA buffer)中。
步骤S402：UE接收基站发送的消息B(MSG B)。
其中，消息B携带了用于竞争冲突解决的信息。
本发明中，网络、基站和RAN可互换使用，所述网络可以是长期演进LTE网络、新无线访问技术(New RAT，NR)网络、增强的长期演进eLTE网络，也可以是3GPP后续演进版本中定义的其他网络。
以下将列举出具体的实施例来说明本发明的处理方法。
实施例1
该实施例给出了一种由用户设备执行的方法，如图5所示，包括如下步骤。
步骤S501：UE接收来自基站的PDCCH order，触发随机接入过程。
步骤S502：在接收到PDCCH order时，当UE所在的服务小区被配置了多个发送接收节点TRP且每个TRP对应的TA值是独立的情况下，UE确定该PDCCH order对应的TRP。
步骤S503：UE根据确定的TRP进行随机接入资源的选择。
其中，在接收到PDCCH order时，UE可以判断该PDCCH order是否来自于特定的TRP。
在一种情况下，UE在该服务小区被配置了多个TRP，并且每个TRP对应的TA值是独立的(也可以理解为UE在该服务小区上被配置了多个TA值，或者是配置了多个TAG，在下文中，这些说法是可以相互替换的)，那么UE在接收到PDCCH order时需要判断该PDCCH order是和哪一个TRP关联，或者是和哪一个TA值/TAG关联。
作为补充，在另外一种情况下，UE在该服务小区不存在被配置了前述的多个TRP的情况，那么UE不需要进行上述的判断。
在上述判断之后，UE可以确定了该PDCCH order对应的TRP，可以认为由该PDCCH order触发的随机接入过程也是对应于该TRP的，或者是和该确定的TRP相关联的。
接着UE进行随机接入资源的选择(Random Access Resource selection)。
如果用于PDCCH order指示的PDCCH中明确指示了RA前导序列的序号，那么UE选择由PDCCH order指示的SSB，如果用于PDCCH order指示的PDCCH中没有明确指示RA前导序列的序号，那么UE进一步判断是否被配置了专有的随机接入资源。具体地，
1.在一种情况下，用于PDCCH order指示的PDCCH中明确的指示了RA前导序列的序号(ra-PreambleIndex)，并且这个明确指示的ra-PreambleIndex的取值不等于0b000000，那么UE可以设置在随机接入过程中的参数PREAMBLE_INDEX的取值为该指示的ra-PreambleIndex，并且选择由PDCCH中指示的SSB。
2.在一种情况下，用于PDCCH order指示的PDCCH中没有明确的指示RA前导序列的序号，或者是指示的RA前导序列的序号取值为0b000000，那么UE需要采用其他的方式来选择RA资源。
例如UE进一步判断是否被配置了专有的随机接入资源，该专有的随机接入资源中至少包含了基于非竞争冲突的随机接入资源(contention-free Random Access Resources)的配置信息，且该配置的随机接入资源是和SSB相关联的或者是和CSI-RS相关联的。
2.1一种情况下，被配置的专有RACH资源是和TRP相关联的。那么基于前面确定的TRP，UE首先需要选择的是和确定的TRP相关联的专有的随机接入资源用于被触发的随机接入过程的资源选择。如果被配置的专有的随机接入资源是和其他的TRP相关联，那么就不应该用于本此随机接入的资源选择，因为这个被触发的随机接入过程是和确定的TRP相关联的。然后在与确定的TRP相关联的专有的随机资源中，如果存在满足电平条件的SSB(或者CSI-RS)，那么就从满足条件的SSB(或者CSI-RS)中选择一个，并且设置参数PREAMBLE_INDEX的取值为该SSB(或者CSI-RS)对应的ra-PreambleIndex。
2.2在另外一种情况下，被配置的专有随机接入资源是不和TRP相关联的。那么在该专有的随机接入资源中进行随机接入过程的资源选择时，被选择的SSB(或者CSI-RS)除了需要满足前述电平方面的要求，还需要满足另外一个条件，就是这个SSB(或者CSI-RS)需要和确定的TRP相关联。然后从满足条件的SSB(或者CSI-RS)中选择一个，并且设置参数PREAMBLE_INDEX的取值为该SSB(或者CSI-RS)对应的ra-PreambleIndex。
3.在另外一种情况下，UE没有被配置前述的配置了专有的随机接入资源，或者是在前述的配置了专有的随机接入资源中没有找到满足条件的SSB或者CSI-RS，那么UE还需要采用其他的方式来选择随机接入资源。
3.1例如，UE在该服务小区被配置了多个TRP的情况下，UE可以在前述确定的TRP所关联的SSB上选择合适的SSB，所谓合适是指该SSB至少满足电平值的要求；如果不存在满足电平值要求的SSB，那么UE可以从前述确定的TRP所关联的SSB上选择任意一个SSB。相应地，UE可以总是选择Random Access Preambles group A中的preamble，并设置参数PREAMBLE_INDEX的取值为所选的preamble的序号(index)。或者是从与前述确定的TRP所关联的随机接入前导序列分组中选择一个preamble，并设置参数PREAMBLE_INDEX的取值为所选的preamble的序号(index)。
3.2又例如，UE在该服务小区被配置了多个TRP的情况下，UE可以在前述确定的TRP所关联的CSI-RS上选择合适的CSI-RS。所谓合适是指该CSI-RS可以满足电平值的要求。如果不存在满足电平值要求的CSI-RS，那么UE可以从前述确定的TRP所关联的CSI-RS上选择任意一个CSI-RS。
-如果选择的CSI-RS存在对应的随机接入资源，那么UE可以根据其对应的随机接入资源设置参数PREAMBLE_INDEX的取值为所对应的preamble的序号(index)；
-如果选择的CSI-RS没有对应的随机接入资源，那么UE可以选择与该CSI-RS相耦合(quasi-colocated)的SSB。然后根据3.1所述的方式选择前导序列。
实施例2
和实施例1的区别在于，UE仅在确定的TRP是second TRP时才执行实施例1中的操作，具体实施方式如下：
UE接收PDCCH order，触发随机接入过程。
在接收到PDCCH order时，UE可以判断该PDCCH order是否来自于特定的TRP。
在一种情况下，UE在该服务小区被配置了至少两个TRP，并且每个TRP对应的TA值是独立的(也可以理解为UE在该服务小区上被配 置了多个TA值，或者是配置了多个TAG，在下文中，这些说法是可以相互替换的)，那么UE在接收到PDCCH order时需要判断该PDCCH order和哪一个TRP关联，或者是和哪一个TA值/TAG关联。以两个TRP为例，其中一个称为primary TRP，另外一个称为secondary TRP。
在UE确定了该PDCCH order对应的TRP是primary TRP时，UE可以在进行随机接入资源选择中执行操作一。作为补充，在另外一种情况下，UE在该服务小区不存在被配置了前述的多个TRP的情况，那么UE不需要进行上述的判断，以及UE可以在进行随机接入资源选择中执行操作一。
在UE确定了该PDCCH order对应的TRP是secondary TRP时，UE可以在进行随机接入资源选择中执行操作二。
操作一：
在一种情况下，PDCCH order中明确的指示了RA前导序列的序号(ra-PreambleIndex)，并且这个明确指示的ra-PreambleIndex的取值不等于0b000000，那么UE可以设置在随机接入过程中的参数PREAMBLE_INDEX的取值为该指示的ra-PreambleIndex，并且选择由PDCCH order中指示的SSB。
在一种情况下，PDCCH order中没有明确的指示RA前导序列的序号，或者是指示的RA前导序列的序号取值为0b000000，那么UE需要采用其他的方式来选择RA资源。
例如UE进一步判断是否被配置了专有的随机接入资源，该专有的随机接入资源中至少包含了基于非竞争冲突的随机接入资源(contention-free Random Access Resources)的配置信息，且该配置的随机接入资源是和SSB相关联的或者是和CSI-RS相关联的。
在被配置的专有的随机资源中，如果存在满足电平条件的SSB(或者CSI-RS)，那么就从满足条件的SSB(或者CSI-RS)中选择一个，并且设置参数PREAMBLE_INDEX的取值为该SSB(或者CSI-RS)对应的ra-PreambleIndex。
如果UE没有被配置前述的配置了专有的随机接入资源，或者是在前述的配置了专有的随机接入资源中没有找到满足条件的SSB或者 CSI-RS，那么UE在SSB上选择合适的SSB，所谓合适是指该SSB至少满足电平值的要求；如果不存在满足电平值要求的SSB，那么UE可以从所有的SSB中选择任意一个SSB。
操作二：如实施例1所示，其中确定的TRP为secondary TRP。
实施例3
对于UE启动的随机接入过程，如果变量PREAMBLE_TRANSMISSION_COUNTER等于参数preambleTransMax取值再加1，(PREAMBLE_TRANSMISSION_COUNTER＝preambleTransMax+1)，UE可以向UE的MAC层的上层(例如RRC层)指示随机接入问题(Random access problem)。
如果该随机接入过程是PDCCH order触发的，且该触发的PDCCH order是和确定的TRP相关联的，那么UE可以向上层指示随机接入问题(Random access problem)，以及指示该随机接入是由来自某一个TRP的PDCCH order触发；
或者如果该随机接入过程是为TRP而触发的，或者说是与确定的TRP相关联的，那么UE向上层指示随机接入问题(Random access problem)，以及指示该随机接入是为TRP触发的，或者指示是与TRP相关联的；
在其他情况下，UE可以直接向上层指示随机接入问题。
UE的上层，例如RRC层接到来自下层的随机接入问题指示，如果该随机接入不是由来自TRP的PDCCH order触发或者不是为TRP而触发的，那么UE认为检测到无线链路失败(consider radio link failure to be detected)；否则，UE不认为检测到RLF。
或者说是UE的上层，例如RRC层接到来自下层的随机接入问题指示，除了在该随机接入是由来自TRP的PDCCH order触发或者是为TRP触发的这种情况下，UE总认为检测到无线链路失败。
实施例3可以和实施例1和2结合使用，也可以单独使用，用来管理和TRP相关联的随机接入问题。
特别的，UE可以对primary TRP和secondary TRP触发的随机接入用不同的处理。
例如，对于UE启动的随机接入过程，如果变量PREAMBLE_TRANSMISSION_COUNTER等于参数preambleTransMax取值再加1，(PREAMBLE_TRANSMISSION_COUNTER＝preambleTransMax+1)，
如果该随机接入是由primary TRP触发的，那么UE直接向上层指示随机接入问题；上层在接收到该指示时，认为检测到无线链路失败，从而可以触发RRC连接重建立流程；
如果该随机接入是由secondary TRP触发的，那么UE向上层指示由secondary TRP触发的随机接入问题；上层在接收到该指示时，不认为检测到无线链路失败。
即，上层在接收到来自下层的随机接入问题指示时，如果该指示不是和secondary TRP相关联，或者不是由secondary TRP触发的随机接入问题，那么UE认为检测到无线链路失败。
又或者上层在接收到来自下层的随机接入问题指示时，除了由secondary TRP触发的随机接入问题外，UE总认为检测到无线链路失败。
实施例4
和实施例3的区别在于在UE判断触发随机接入过程的原因时，如果该随机接入过程是PDCCH order触发的，且该触发的PDCCH order是和确定的TRP相关联的，那么UE不向上层指示随机接入问题(Random access problem)；
或者如果该随机接入过程是为TRP而触发的，或者说是与TRP相关联的，那么UE不向上层指示随机接入问题(Random access problem)；
在其他情况下，UE可以直接向上层指示随机接入问题。
作为补充，UE的上层，例如RRC层在接收到来自下层的随机接入问题指示时，认为检测到无线链路失败(Radio Link Failure)。
实施例5
在实施例3或者4的基础上，对于UE启动的随机接入过程，如果变量PREAMBLE_TRANSMISSION_COUNTER等于参数preambleTransMax取值再加1，(PREAMBLE_TRANSMISSION_COUNTER＝preambleTransMax+1)，UE认为随机接入过程没有成功完成(Random Access procedure unsuccessfully completed)。
对于没有成功完成的随机接入过程，如果该随机接入过程是PDCCH order触发的，且该触发的PDCCH order是和确定的TRP相关联的，或者如果该随机接入过程是为TRP而触发的，或者说是与TRP相关联的，UE可以生成MAC CE，在该MAC CE中可以指示了与该随机接入关联的TRP的信息，以及还可以指示了发生随机接入失败的信息。然后UE将该MAC CE发送给基站。
实施例6
在前述实施例中UE如何确定PDCCH order对应的TRP，可以有以下几种方式：
方式一，通过用于接收PDCCH的搜索空间search space被配置的ControlResourceSet对应的CORESETPoolIndex来确定。
例如UE在search space上对应于CORESETPoolIndex取值为0的ControlResourceSet上接收到的PDCCH，其对应的TRP可以为TRP-1；而UE在search space上对应于CORESETPoolIndex取值为1的资源上接收到的PDCCH其对应的TRP可以为TRP-2。
或者是UE在search space上对应于CORESETPoolIndex取值为1的ControlResourceSet(这样的Coreset可以称为第二CORSET)上接收到的PDCCH，其对应的TRP可以为secondary TRP或者是第二TRP；而UE在search space上对应于CORESETPoolIndex没有被赋值的ControlResourceSet(这样的Coreset可以称为第一CORSET)上接收到的PDCCH其对应的TRP可以为primary TRP或者是第一TRP。
方式二，通过TCI state来确定。
例如UE在激活的TCI state上接收的PDCCH，那么对应的TRP就是被配置了该TCI state的TRP。
还可以是根据接收到的、用于PDCCH order的DCI格式中指示的TCI state，确定该PDCCH order对应的TRP。
或者UE被配置的所有的TCI state可以分成若干个组或者集合，每个组或者集合可以对应一个TRP。那么可以根据接收到的、用于PDCCH order的DCI格式中指示的TCI state其所属于的TCI state集合来确定TRP。或者根据用于接收PDCCH的TCI state其所属于的TCI state激活来确定TRP。
方式三：直接指示
在用于PDCCH order的DCI格式中携带指示信息，指示该PDCCH order对应的TRP，例如设置TRP域的取值为0时对应于TRP-1，取值为1时对应于TRP-2。
除了上述方式外，在本文中不限制UE通过其他的方式确定PDCCH order对应的TRP。
图6是本发明所涉及的用户设备的简要结构框图。
如图6所示，该用户设备600至少包括处理器601和存储器602。处理器601例如可以包括微处理器、微控制器、嵌入式处理器等。存储器602例如可以包括易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器系统等。存储器602上存储有程序指令。该指令在由处理器601运行时，可以执行本公开的UE的处理方法中的一个或几个步骤。
上文已经结合优选实施例对本公开的方法和涉及的设备进行了描述。本领域技术人员可以理解，上面示出的方法仅是示例性的，而且以上说明的各实施例在不发生矛盾的情况下能够相互组合。本发明的方法并不局限于上面示出的步骤和顺序。
上面示出的用户设备可以包括更多的模块，例如还可以包括可以开发的或者将来开发的可用于基站、MME、或UE的模块等等。上文中示出的各种标识仅是示例性的而不是限制性的，本公开并不局限于作为这些标识的示例的具体信元。本领域技术人员根据所示实施例的教导可以 进行许多变化和修改。
应该理解，本公开的上述实施例可以通过软件、硬件或者软件和硬件两者的结合来实现。例如，上述实施例中的基站和用户设备内部的各种组件可以通过多种器件来实现，这些器件包括但不限于：模拟电路器件、数字电路器件、数字信号处理(DSP)电路、可编程处理器、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、可编程逻辑器件(CPLD)，等等。
此外，运行在根据本发明的设备上的程序可以是通过控制中央处理单元(CPU)来使计算机实现本发明的实施例功能的程序。该程序或由该程序处理的信息可以临时存储在易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器系统中。
用于实现本发明各实施例功能的程序可以记录在计算机可读记录介质上。可以通过使计算机系统读取记录在所述记录介质上的程序并执行这些程序来实现相应的功能。此处的所谓“计算机系统”可以是嵌入在该设备中的计算机系统，可以包括操作系统或硬件(如外围设备)。“计算机可读记录介质”可以是半导体记录介质、光学记录介质、磁性记录介质、短时动态存储程序的记录介质、或计算机可读的任何其他记录介质。
用在上述实施例中的设备的各种特征或功能模块可以通过电路(例如，单片或多片集成电路)来实现或执行。设计用于执行本说明书所描述的功能的电路可以包括通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、或其他可编程逻辑器件、分立的门或晶体管逻辑、分立的硬件组件、或上述器件的任意组合。通用处理器可以是微处理器，也可以是任何现有的处理器、控制器、微控制器、或状态机。上述电路可以是数字电路，也可以是模拟电路。因半导体技术的进步而出现了替代现有集成电路的新的集成电路技术的情况下，本发明的一个或多个实施例也可以使用这些新的集成电路技术来实现。
此外，本发明并不局限于上述实施例。尽管已经描述了所述实施例 的各种示例，但本发明并不局限于此。安装在室内或室外的固定或非移动电子设备可以用作终端设备或通信设备，如AV设备、厨房设备、清洁设备、空调、办公设备、自动贩售机、以及其他家用电器等。
如上，已经参考附图对本发明的实施例进行了详细描述。但是，具体的结构并不局限于上述实施例，本发明也包括不偏离本发明主旨的任何设计改动。另外，可以在权利要求的范围内对本发明进行多种改动，通过适当地组合不同实施例所公开的技术手段所得到的实施例也包含在本发明的技术范围内。此外，上述实施例中所描述的具有相同效果的组件可以相互替代。

Claims (10)

  1. 一种由用户设备执行的方法，包括如下步骤：
    用户设备UE接收来自基站的物理下行控制信道PDCCH命令，触发随机接入过程；
    在接收到PDCCH命令时，当UE所在的服务小区被配置了多个发送接收节点TRP且每个TRP对应的时间提前量TA值是独立的情况下，UE确定该PDCCH命令对应的TRP；
    UE根据确定的TRP进行随机接入资源的选择。
  2. 根据权利要求1所述的由用户设备执行的方法，其中，还包括如下步骤：
    根据确定的TRP，选择与确定的TRP相关联的、专有的随机接入资源用于被触发的随机接入过程。
  3. 根据权利要求1所述的由用户设备执行的方法，其中，还包括如下步骤：
    根据确定的TRP，选择与确定的TRP相关联的SSB或者CSI-RS用于被触发的随机接入过程，并且设置随机接入参数前导序列序号PREAMBLE_INDEX的取值等于选定的SSB或者CSI-RS对应的前导序列序号。
  4. 根据权利要求1至3中任一项所述的由用户设备执行的方法，其中，
    UE仅在确定的TRP是辅TRP时才根据确定的TRP进行随机接入资源的选择。
  5. 根据权利要求1至3中任一项所述的由用户设备执行的方法，其中，还包括如下步骤：
    在UE启动的随机接入过程中，当前导序列发送的次数等于最多允许前导序列发送次数的取值加1时，
    如果该随机接入过程是PDCCH命令触发的，且该触发的PDCCH命令是和确定的TRP相关联的，那么UE向上层指示随机接入问题，以及指示该随机接入是由来自某一个TRP的PDCCH命令触发的；
    如果该随机接入过程是为TRP而触发的，或者是与确定的TRP相关联的，那么UE向上层指示随机接入问题，以及指示该随机接入是为TRP触发的，或者指示是与TRP相关联的；
    在UE的上层接收到来自下层的随机接入问题指示时，如果该随机接入不是由来自TRP的PDCCH命令触发或者不是为TRP而触发的，那么UE判断为检测到无线链路失败RLF。
  6. 根据权利要求1至3中任一项所述的由用户设备执行的方法，其中，还包括如下步骤：
    在UE启动的随机接入过程中，当前导序列发送的次数等于最多允许前导序列发送次数的取值加1时，
    如果该随机接入过程是PDCCH命令触发的，且该触发的PDCCH命令是和确定的TRP相关联的，那么UE不向上层指示随机接入问题；
    如果该随机接入过程是为TRP而触发的，或者是与TRP相关联的，那么UE不向上层指示随机接入问题；
    在UE的上层接收到来自下层的随机接入问题指示时，UE判断为检测到无线链路失败RLF。
  7. 根据权利要求5所述的由用户设备执行的方法，其中，还包括如下步骤：
    对于没有成功完成的随机接入过程，如果该随机接入过程是PDCCH命令触发的，且该触发的PDCCH命令是和确定的TRP相关联的，或者如果该随机接入过程是为TRP而触发的，或者是与TRP相关联的，那么UE生成MAC CE，在该MAC CE中指示了与该随机接入关联的TRP的信息，以及指示了发生随机接入失败的信息。
  8. 根据权利要求6所述的由用户设备执行的方法，其中，还包括如下步骤：
    对于没有成功完成的随机接入过程，如果该随机接入过程是PDCCH命令触发的，且该触发的PDCCH命令是和确定的TRP相关联的，或者如果该随机接入过程是为TRP而触发的，或者是与TRP相关联的，那么UE生成MAC CE，在该MAC CE中指示了与该随机接入关联的TRP的信息，以及指示了发生随机接入失败的信息。
  9. 根据权利要求1至3中任一项所述的由用户设备执行的方法，其中，还包括如下步骤：
    通过传输配置指示TCI状态来确定PDCCH命令对应的TRP。
  10. 一种用户设备，包括：
    处理器；以及
    存储器，存储有指令，
    其中，上述指令在由上述处理器运行时执行根据权利要求1至9中任一项所述的方法。
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