WO2021027356A1 - Procédé et dispositif pour effectuer un traitement après un échec d'accès à une cellule - Google Patents

Procédé et dispositif pour effectuer un traitement après un échec d'accès à une cellule Download PDF

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Publication number
WO2021027356A1
WO2021027356A1 PCT/CN2020/091379 CN2020091379W WO2021027356A1 WO 2021027356 A1 WO2021027356 A1 WO 2021027356A1 CN 2020091379 W CN2020091379 W CN 2020091379W WO 2021027356 A1 WO2021027356 A1 WO 2021027356A1
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WIPO (PCT)
Prior art keywords
terminal
target cell
trigger
timer
access
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PCT/CN2020/091379
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English (en)
Chinese (zh)
Inventor
许萌
梁靖
缪德山
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大唐移动通信设备有限公司
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Publication of WO2021027356A1 publication Critical patent/WO2021027356A1/fr

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    • 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
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • 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
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • the present disclosure relates to the field of communication technologies, and in particular, to a processing method and device after a cell access failure.
  • the uplink resource is a periodic uplink resource, and the late access of the UE will cause resource waste.
  • the UE needs to access the target cell within the pre-configured uplink resource effective time. However, if the UE misses a valid uplink resource or fails to successfully access the target cell within a specified time, there is no specific plan for how the UE should handle it.
  • the present disclosure provides a processing method and device after a cell access failure, which is suitable for RACH-LESS handover scenarios after a pre-configured uplink resource validity period is introduced, so as to solve the problem of how to deal with a terminal failure to access a cell.
  • embodiments of the present disclosure provide a processing method after a cell access failure, including:
  • the terminal accesses the target cell according to the network configuration
  • the terminal After the terminal fails to access the target cell, it performs processing according to the state of the preset timer and/or the effective state of the pre-configured uplink resource.
  • the above method enables the terminal to perform processing according to the state of the preset timer, the effective state of the pre-configured uplink resource, or a combination of the two states after failing to access the cell.
  • the effective state of the pre-configured uplink resource is invalid
  • the terminal triggers the radio resource control RRC reestablishment process
  • the terminal enters an idle state; or,
  • the terminal triggers the non-access stratum NAS recovery process
  • the terminal enters the idle state and triggers the NAS recovery process
  • the terminal triggers a random access procedure to access the target cell
  • the terminal starts the first timer to monitor the physical downlink control channel of the target cell; or,
  • the terminal starts a second timer and triggers a random access procedure to access the target cell.
  • the above method enables the terminal to perform subsequent processing operations according to the effective state of the pre-configured uplink resource after failing to access the cell.
  • the state of the preset timer is not timed out, and the valid state of the pre-configured uplink resource is invalid;
  • the terminal performs processing according to the state of the preset timer and the effective state of the pre-configured uplink resource, including:
  • the terminal triggers a random access procedure to access the target cell
  • the terminal turns off the preset timer and triggers a random access procedure to access the target cell; or,
  • the terminal resets the preset timer and triggers a random access procedure to access the target cell;
  • the terminal starts the second timer and triggers a random access procedure to access the target cell; or,
  • the terminal monitors the physical downlink control channel of the target cell; or,
  • the terminal resets the preset timer and monitors the physical downlink control channel of the target cell; or,
  • the terminal starts a first timer to monitor the physical downlink control channel of the target cell.
  • the above method enables the terminal to perform subsequent processing operations according to the state of the preset timer and the effective state of the pre-configured uplink resource after failing to access the cell.
  • the effective state of the pre-configured uplink resource is effective
  • the terminal triggers the RRC re-establishment process
  • the terminal enters an idle state; or,
  • the terminal triggers the NAS recovery process
  • the terminal enters the idle state and triggers the NAS recovery process
  • the terminal releases the uplink resources and triggers a random access procedure to access the target cell;
  • the terminal releases the uplink resource and starts a second timer; the terminal triggers a random access procedure to access the target cell; or,
  • the terminal starts the first timer to monitor the physical downlink control channel of the target cell; or,
  • the terminal sends uplink data in the uplink resource within the validity period of the uplink resource.
  • the above method enables the terminal to perform subsequent processing operations according to the state of the preset timer and the effective state of the pre-configured uplink resource after failing to access the cell.
  • the method further includes:
  • the terminal monitors the signaling of the downlink control channel scrambled with the temporary identifier of the terminal before the first timer expires, the terminal turns off the first timer; or,
  • the terminal If the first timer expires and the terminal does not monitor the signaling of the downlink control channel scrambled with the temporary identifier of the terminal, the terminal performs a preset operation;
  • the preset operation includes one of the following:
  • the above method enables the terminal to perform subsequent processing operations according to the state of the preset timer, or the effective state of the pre-configured uplink resource, or combining the states of the two after failing to access the cell.
  • the method further includes:
  • the terminal turns off the second timer; or,
  • the terminal If the second timer expires and the terminal does not access the target cell, the terminal performs a preset operation
  • the preset operation includes one of the following:
  • the above method enables the terminal to perform according to the state of the preset timer, the effective state of the pre-configured uplink resource, or the state of the preset timer and the effective state of the pre-configured uplink resource after the terminal fails to access the cell. Subsequent processing operations.
  • the method further includes:
  • the terminal performs a preset operation
  • the preset operation includes one of the following:
  • the above method enables the terminal to execute according to the state of the preset timer, the effective state of the pre-configured uplink resource, or the state of the preset timer and the effective state of the pre-configured uplink resource after the terminal fails to access the cell. Subsequent processing operations.
  • the method further includes:
  • the terminal turns off the preset timer; or,
  • the terminal If the preset timer expires and the terminal does not access the target cell, the terminal performs a preset operation
  • the preset operation includes one of the following:
  • the above method enables the terminal to perform subsequent processing operations according to the state of the preset timer and the effective state of the pre-configured uplink resource after failing to access the cell.
  • the method further includes:
  • the terminal monitors the signaling of the downlink control channel scrambled with the temporary identifier of the terminal before the preset timer expires, the terminal turns off the preset timer; or,
  • the terminal If the preset timer expires and the terminal does not monitor the signaling of the downlink control channel scrambled with the temporary identifier of the terminal, the terminal performs a preset operation;
  • the preset operation includes one of the following:
  • the above method enables the terminal to perform subsequent processing operations according to the state of the preset timer and the effective state of the pre-configured uplink resource after the terminal fails to access the cell.
  • the method further includes:
  • the terminal monitors the signaling of the downlink control channel scrambled with the temporary identifier of the terminal or receives the response message of successfully sending the uplink data during the effective period of the uplink resource, the terminal releases the uplink data.
  • the terminal If the uplink resource validity period ends and the terminal does not monitor the signaling of the downlink control channel scrambled with the temporary identifier of the terminal or does not receive the response message for successfully sending the uplink data, the terminal performs preset operating;
  • the preset operation includes one of the following:
  • the above method enables the terminal to perform subsequent processing operations according to the state of the preset timer and the effective state of the pre-configured uplink resource after failing to access the cell.
  • embodiments of the present disclosure provide a terminal, including: a processor and a memory;
  • the processor is used to read the program in the memory and execute the following process:
  • processing is performed according to the state of the preset timer and/or the effective state of the pre-configured uplink resource.
  • the effective state of the pre-configured uplink resource is invalid
  • the processor is specifically used for:
  • the second timer is started, and a random access procedure is triggered to access the target cell.
  • the state of the preset timer is not timed out, and the effective state of the pre-configured uplink resource is invalid;
  • the processor is specifically used for:
  • the effective state of the pre-configured uplink resource is effective
  • the processor is specifically used for:
  • the terminal Release the uplink resource and start a second timer; the terminal triggers a random access procedure to access the target cell; or,
  • the processor is further configured to:
  • the preset operation includes one of the following:
  • the processor is further configured to:
  • the second timer After starting the second timer and triggering the random access procedure to access the target cell, if the random access procedure is completed before the second timer expires, the second timer is turned off; or,
  • the preset operation includes one of the following:
  • the processor is further configured to:
  • the preset operation includes one of the following:
  • the processor is further configured to:
  • the preset timer After triggering the random access procedure to access the target cell, if the random access procedure is completed before the preset timer expires, the preset timer is turned off; or,
  • the preset operation includes one of the following:
  • the processor is further configured to:
  • the preset timing is turned off ⁇ ;
  • the preset operation includes one of the following:
  • the processor is further configured to:
  • the uplink resource After the uplink data is sent in the uplink resource within the validity period of the uplink resource, if during the validity period of the uplink resource, the signaling of the downlink control channel scrambled with the temporary identifier of the terminal is monitored or the successful uplink transmission is received. Data response message, the uplink resource is released;
  • the preset operation includes one of the following:
  • embodiments of the present disclosure also provide a processing device after a cell access failure, including:
  • Access module used to access the target cell according to the network configuration
  • the processing module is used for processing according to the state of the preset timer and/or the effective state of the pre-configured uplink resource after the target cell is not successfully accessed.
  • the effective state of the pre-configured uplink resource is invalid
  • the processing module is specifically used for:
  • the second timer is started, and a random access procedure is triggered to access the target cell.
  • the state of the preset timer is not timed out, and the effective state of the pre-configured uplink resource is invalid;
  • the processing module is specifically used for:
  • the effective state of the pre-configured uplink resource is effective
  • the processing module is specifically used for:
  • the terminal Release the uplink resource and start a second timer; the terminal triggers a random access procedure to access the target cell; or,
  • the processing module is further configured to:
  • the preset operation includes one of the following:
  • the processing module is further configured to:
  • the second timer After starting the second timer and triggering the random access procedure to access the target cell, if the random access procedure is completed before the second timer expires, the second timer is turned off; or,
  • the preset operation includes one of the following:
  • the processing module is further configured to:
  • the preset operation includes one of the following:
  • the processing module is further configured to:
  • the preset timer After triggering the random access procedure to access the target cell, if the random access procedure is completed before the preset timer expires, the preset timer is turned off; or,
  • the preset operation includes one of the following:
  • the processing module is further configured to:
  • the preset timing is turned off ⁇ ;
  • the preset operation includes one of the following:
  • the processing module is further configured to:
  • the uplink resource After the uplink data is sent in the uplink resource within the validity period of the uplink resource, if during the validity period of the uplink resource, the signaling of the downlink control channel scrambled with the temporary identifier of the terminal is monitored or the successful uplink transmission is received Data response message, the uplink resource is released;
  • the preset operation includes one of the following:
  • the present disclosure also provides a computer storage medium on which a computer program is stored, and when the program is executed by a processing unit, the steps of the method described in the first aspect are implemented.
  • Figure 1 is a sequence diagram of a UE performing cell handover in the related art
  • FIG. 2 is a flowchart of a processing method after a cell access failure in an embodiment of the disclosure
  • FIG. 3 is a schematic diagram of a terminal in an embodiment of the disclosure.
  • FIG. 4 is a schematic diagram of a processing device after a cell access failure in an embodiment of the disclosure.
  • a sequence diagram of cell handover for UE in related technologies may include the following steps:
  • Step 101 The UE reports a measurement report to the source cell.
  • Step 102 The source cell makes a handover decision based on the measurement report.
  • Step 103 The source cell sends a handover request message to the target cell.
  • Step 104 The target cell allows the UE to switch to the target cell, and assigns a new C-RNTI (Cell Radio Network Temporary Identifier, cell radio network temporary identifier) to the UE. If the target cell decides to configure RACH-LESS for the UE, it generates a handover command that includes indication information of RACH-skip.
  • C-RNTI Cell Radio Network Temporary Identifier, cell radio network temporary identifier
  • the handover command may also include TA (Timing Advance) information.
  • the target cell may also allocate pre-configured uplink resources to the UE, and the handover command may also include pre-configured uplink resource information.
  • Step 105 The target cell sends a handover request response carrying a handover command to the source cell.
  • Step 106 The source cell sends a handover command to the UE.
  • Step 107 The UE starts the timer T304, configures the UE according to the handover command, and synchronizes to the target cell; and sends an uplink message according to the TA information carried in the handover command.
  • Step 108 If the target cell allocates pre-configured uplink resources to the UE, the UE sends uplink data on the pre-configured uplink resources, that is, the UE starts to send a handover complete message to the target cell at the first valid PUSCH.
  • Step 109 The UE monitors the PDCCH of the target cell.
  • Step 110 The UE stops the timer T304 when it monitors the signaling of the PDCCH scrambled with the C-RNTI of the UE.
  • step 108 may also be performed as follows: if the target cell does not allocate pre-configured uplink resources for the UE, the UE monitors the PDCCH message of the target cell. Then step 109 may be performed as the UE stops the timer T304 when it monitors the signaling of the PDCCH scrambled with the C-RNTI of the UE. Then step 110 may be performed to send a handover complete message for the UE according to the uplink resource allocated by the PDCCH.
  • step 108 may be performed to trigger the RRC re-establishment process for the UE.
  • embodiments of the present disclosure provide a processing method after a cell access failure.
  • this method for example, when the terminal is performing cell handover, or when a terminal configured with dual connectivity changes in the PSCell of the primary cell of the secondary cell group, if the terminal fails to access the target PCell or PScell cell, the terminal will perform the handover control or synchronization reset. The status of the configured timer, the valid status of the pre-configured uplink resources, or the processing according to the status of both.
  • the above method enables the UE to perform corresponding processing according to the state of the preset timer and the effective state of the pre-configured uplink resources when the UE fails to access the target cell.
  • the terminal is a device with wireless communication function, which can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; it can also be deployed on the water (such as ships, etc.); it can also be deployed in the air (For example, airplanes, balloons, satellites, etc.).
  • the terminal may be a mobile phone (Mobile Phone), a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (Virtual Reality, VR) terminal, an augmented reality (Augmented Reality, AR) terminal, an industrial control (Industrial Control)
  • FIG. 2 is a flowchart of a processing method after a cell access failure in an embodiment of the disclosure, which may include the following steps:
  • Step 201 The terminal accesses the target cell according to the network configuration.
  • the terminal may perform the handover process or the primary cell PCell synchronization reconfiguration process according to the handover command or the synchronization reconfiguration command. Or, it can also be the process of PSCell change or synchronization reconfiguration of the terminal configured with dual connectivity, but it is not limited to the above two scenarios. It can be applied to scenarios where the UE needs to perform uplink synchronization, such as downlink data reaching uplink out of synchronization, adding secondary cells, etc. .
  • Step 202 After the terminal fails to access the target cell, it performs processing according to the state of the preset timer and/or the effective state of the pre-configured uplink resource.
  • the preset timer may be a timer for controlling handover or a timer for controlling synchronous reconfiguration or a timer for controlling PSCell change, such as a T304 timer or a T307 timer.
  • the above method enables the UE to process according to the state of the preset timer, or the effective state of the pre-configured uplink resource, or a combination of the two states after the UE fails to access the cell.
  • step 202 When the above step 202 is implemented, it can be processed according to the following three different situations, which will be described in detail below.
  • the target cell may allocate uplink resources for the terminal, and carry the pre-configured uplink resource information in the handover command.
  • the terminal sends uplink data according to the configured uplink resource during the valid period of the pre-configured uplink resource. If the terminal does not receive the PDCCH order scrambled with the C-RNTI of the UE during the valid period of the uplink resource, or does not receive the uplink data transmission
  • a successful response message such as an ARQ or HARQ process ACK response message, indicates that the terminal has not successfully accessed the target cell.
  • the terminal can perform processing according to any one of the following methods 1 to 7:
  • Manner 1 The terminal triggers the RRC re-establishment process.
  • the terminal selects a reestablished cell and triggers the reestablishment process to restore the RRC connection in the selected cell. For example, the terminal selects to initiate the RRC reestablishment process in the source cell to restore the RRC connection in the source cell.
  • Method 2 The terminal enters the idle state.
  • the terminal when the terminal accesses the target cell according to the network configuration and fails to access the target cell during the valid period of the pre-configured uplink resources, the terminal enters the idle state, and the UE enters the idle state and can reselect the cell to access.
  • Method 3 The terminal triggers the non-access layer NAS recovery process.
  • the terminal When the terminal accesses the target cell according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resources, the terminal can trigger the NAS recovery process, and the NAS triggers the new cell access process.
  • Method 4 The terminal enters the idle state and triggers the NAS recovery process.
  • the RRC layer releases the air interface connection and enters the idle state, and informs the NAS to trigger the NAS recovery process, which is triggered by the NAS New cell access process.
  • Manner 5 The terminal triggers a random access procedure to access the target cell.
  • the terminal when the terminal accesses the target cell according to the network configuration, it fails to access the target cell during the valid period of the pre-configured uplink resources. If the target cell allocates dedicated random access resources to the terminal, the terminal triggers non-competitive random access Access process, that is, sending a dedicated preamble sequence to the target cell, or on the beam that the UE selects to access in the multi-beam scenario, and the network allocates dedicated random access resources to the UE, then the non-contention random access process is triggered on the beam , Otherwise it triggers the contention random access process. If the target cell does not allocate dedicated random access resources for the terminal, the terminal triggers a competitive random access process, that is, the terminal randomly selects a preamble sequence to send to the target cell. Or, the terminal can ignore the dedicated random access resources allocated by the target cell, and directly trigger the competing random access process.
  • non-competitive random access Access process that is, sending a dedicated preamble sequence to the target cell, or on the beam that the UE selects to
  • the terminal needs to perform a preset operation.
  • the preset operation includes one of the following: entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process; triggering the RRC reconstruction process.
  • the target cell does not allocate random access resources for the terminal, and the terminal triggers a competing random access process to access the target cell, and sends a randomly selected preamble sequence to the target cell.
  • the terminal triggers the RRC reestablishment process.
  • the target cell allocates dedicated random access resources to the terminal, and the terminal triggers a non-competitive random access process to access the target cell, and sends a dedicated preamble sequence to the target cell.
  • the RRC layer of the terminal receives the indication information of random access failure sent by the MAC layer, it enters the idle state.
  • Manner 6 The terminal starts the first timer to monitor the physical downlink control channel of the target cell.
  • the terminal when the target cell allows the terminal to switch to the target cell, the terminal will be assigned a new UE ID, that is, a new C-RNTI (Cell-Radio Network Temporary Identifier, cell radio network temporary identifier).
  • C-RNTI Cell-Radio Network Temporary Identifier, cell radio network temporary identifier
  • the first timer is turned off.
  • the first timer duration is configured to the UE through signaling by the network or a preset value specified by the protocol. For example, when the terminal accesses the target cell according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resources, the first timer is started to monitor the physical downlink control channel of the target cell. Before the first timer expires, if the terminal monitors the signaling of the downlink control channel scrambled with the C-RNTI of the terminal, the first timer is turned off.
  • the terminal If the first timer expires and the terminal does not monitor the signaling of the downlink control channel scrambled with the C-RNTI of the terminal, it indicates that the terminal has not successfully accessed the target cell. At this time, the terminal performs a preset operation. Specifically, the preset operation includes one of the following: entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process; triggering the RRC reconstruction process.
  • the terminal accesses the target cell according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resource, the terminal starts the first timer to monitor the physical downlink control channel of the target cell.
  • the first timer expires, and the terminal does not monitor the signaling of the downlink control channel scrambled with the C-RNTI of the terminal, the RRC re-establishment process is triggered.
  • Manner 7 The terminal starts the second timer and triggers a random access procedure to access the target cell.
  • the second timer is started and the random access process is triggered to access the target cell. Specifically, if the target cell allocates dedicated random access resources to the terminal, a non-competitive random access process is triggered, or in a multi-beam scenario, the UE selects the beam for access, and the network allocates dedicated random access to the UE Resource, the non-contention random access process is triggered on the beam, otherwise, the contention random access is triggered. If the target cell does not allocate dedicated random access resources for the terminal, a competing random access process is triggered. Or, the terminal can ignore whether the target cell allocates dedicated random access resources, and only trigger the competing random access process.
  • the second timer duration is configured by the network to the UE through signaling or a preset value specified by the protocol.
  • the second timer is turned off.
  • the target cell allocates dedicated random access resources for the terminal.
  • the terminal accesses the target cell according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resource, the terminal starts the second timer and triggers a non-contention random access process to access the target cell.
  • the second timer is turned off.
  • the terminal performs a preset operation.
  • the preset operation is one of the following: enter the idle state; trigger the NAS recovery process; enter the idle state and trigger the NAS recovery process; trigger the RRC reconstruction process.
  • the target cell allocates random access resources to the terminal.
  • the terminal accesses the target cell according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resources, the terminal starts the second timer and triggers the random access process of contention to be included in the target cell.
  • the second timer expires, the terminal does not access the target cell, the terminal enters an idle state and triggers the NAS recovery process.
  • Case 2 The preset timer has not expired, and the pre-configured uplink resource is invalid.
  • the terminal sends uplink data on the configured uplink resource during the effective period of the uplink resource allocated by the target cell to the terminal, but the terminal does not receive the PDCCH message scrambled with the terminal's C-RNTI, or the uplink data is not successfully received
  • the terminal fails to access the target cell.
  • the terminal can perform processing according to any one of methods 1 to 7:
  • Method 1 The terminal triggers a random access procedure to access the target cell.
  • the terminal triggers the random access process. If the terminal completes the random access process before the preset timer expires, the UE successfully accesses the target cell, and the preset timer can be turned off.
  • the terminal performs the RACH-less handover process according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resource. At this time, T304 does not time out and the pre-configured uplink resource is invalid.
  • the terminal triggers the random access process to access the target cell, the terminal completes random access before the timeout of T304, and successfully accesses the target cell, the terminal turns off T304.
  • the terminal performs a preset operation.
  • the preset operation includes one of the following: enter the idle state; trigger the NAS recovery process; enter the idle state and trigger the NAS recovery process; trigger the RRC reconstruction process.
  • the terminal performs the RACH-less handover process according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resource. At this time, T304 does not time out and the pre-configured uplink resource is invalid.
  • the terminal triggers the random access process to access the target cell, T304 times out, the random access process is not completed, and the terminal does not successfully access the target cell, then the RRC reestablishment process is triggered.
  • the MAC layer may also be controlled to determine whether the random access process is successful and whether the terminal successfully accesses the target cell. Specifically, if the RRC layer of the terminal receives the random access failure indication information sent by the MAC layer, the terminal performs a preset operation.
  • the preset operation includes one of the following: enter the idle state; trigger the NAS recovery process; enter the idle state and trigger the NAS recovery process; trigger the RRC reconstruction process.
  • the terminal performs the RACH-less handover process according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resource, T304 does not time out, and the pre-configured uplink resource is invalid.
  • the terminal triggers the random access process to access the target cell, and the RRC layer of the terminal receives the indication information of random access failure sent by the MAC layer.
  • the RRC learns that the random access fails, it enters the idle state.
  • Manner 2 The terminal turns off the preset timer and triggers a random access process to access the target cell.
  • the terminal triggers a non-competitive random access process, that is, sending a dedicated preamble sequence to the target cell, or on the beam that the UE selects to access in the multi-beam scenario.
  • the network allocates dedicated random access resources for the UE, and then triggers the non-contention random access process on the beam, otherwise triggers the contention random access.
  • the terminal triggers a competing random access process, that is, the terminal randomly selects a preamble sequence to send to the target cell.
  • the terminal can ignore the random access resources allocated by the target cell and directly trigger the competing random access process.
  • the preset operation includes one of the following: entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process; triggering the RRC reconstruction process.
  • the terminal performs the RACH-less handover process according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resource. At this time, T304 does not time out and the pre-configured uplink resource is invalid.
  • the terminal triggers the random access process to access the target cell, and the RRC receives the random access failure indication information sent by the MAC layer, and then triggers the RRC reestablishment process.
  • the terminal performs the RACH-less handover process according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resource. At this time, T304 does not time out and the pre-configured uplink resource is invalid. The terminal triggers a random access procedure to access the target cell, and successfully accesses the target cell.
  • Manner 3 The terminal resets the preset timer and triggers a random access procedure to access the target cell.
  • the terminal triggers a non-competitive random access process, that is, sending a dedicated preamble sequence to the target cell, or on the beam that the UE selects to access in the multi-beam scenario.
  • the network allocates dedicated random access resources for the UE, and then triggers the non-contention random access process on the beam, otherwise triggers the contention random access.
  • the terminal triggers a competitive random access process, that is, the terminal randomly selects a preamble sequence to send to the target cell.
  • the terminal can ignore the random access resources allocated by the target cell and directly trigger the competing random access process.
  • the terminal performs the RACH-less handover process according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resource. At this time, T304 does not time out and the pre-configured uplink resource is invalid.
  • the terminal resets the preset timer, that is, resets T304, and triggers the random access procedure to access the target cell.
  • the preset timer is turned off. If the preset timer expires and the terminal fails to access the target cell, the preset operation is performed.
  • the preset operation includes one of the following: enter the idle state; trigger the NAS recovery process; enter the idle state and trigger the NAS recovery process; trigger the RRC reconstruction process.
  • Manner 4 The terminal starts the second timer and triggers a random access procedure to access the target cell.
  • the terminal if the target cell allocates dedicated random access resources to the terminal, the terminal triggers a non-competitive random access process, that is, sending a dedicated preamble sequence to the target cell, or on the beam that the UE selects to access in the multi-beam scenario, The network allocates dedicated random access resources for the UE, and then triggers the non-contention random access process on the beam, otherwise triggers the contention random access. If the target cell does not allocate dedicated random access resources for the terminal, the terminal triggers a competitive random access process, that is, the terminal randomly selects a preamble sequence to send to the target cell. Alternatively, the terminal can ignore the random access resources allocated by the target cell and directly trigger the competing random access process.
  • the second timer duration is configured by the network to the UE through signaling or a preset value specified by the protocol.
  • the terminal performs the RACH-less handover process according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resource, the second timer is started to trigger the random access process to access the target cell. If the terminal completes the random access process before the second timer expires and the terminal successfully accesses the target cell, the second timer is turned off. If the second timer expires and the target cell is not successfully accessed, the preset operation is performed.
  • the preset operation includes one of the following: enter the idle state; trigger the NAS recovery process; enter the idle state and trigger the NAS recovery process; trigger the RRC reconstruction process.
  • the terminal performs the RACH-less handover process according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resource, starts the second timer, and triggers the random access process to access the target cell. Before the second timer expires, if the random access process is not completed and the terminal fails to access the target cell, the terminal enters an idle state.
  • Manner 5 The terminal monitors the physical downlink control channel of the target cell.
  • the preset timer is closed. If the preset timer expires and the terminal does not monitor the signaling of the downlink control channel scrambled with the C-RNTI of the terminal, the preset operation is performed.
  • the preset operations include: entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process; triggering the RRC reconstruction process.
  • the terminal performs the RACH-less handover process according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resource, and the terminal monitors the physical downlink control channel of the target cell. If the terminal monitors the signaling of the downlink control channel scrambled with the terminal's C-RNTI before the preset timer T304 expires, the preset timer is turned off.
  • Manner 6 The terminal resets the preset timer and monitors the physical downlink control channel of the target cell.
  • the preset timer is closed.
  • the preset timer expires, and the terminal does not monitor the signaling of the downlink control channel scrambled with the C-RNTI of the terminal, and then executes the preset operation.
  • the preset operations include: entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process; triggering the RRC reconstruction process.
  • the terminal performs the RACH-less handover process according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resources, the terminal resets the preset timer, that is, resets T304, and monitors the physical downlink control channel of the target cell. If the terminal does not monitor the signaling of the downlink control channel scrambled with the terminal's C-RNTI before the preset timer T304 expires, the terminal triggers the NAS recovery process.
  • Manner 7 The terminal starts the first timer to monitor the physical downlink control channel of the target cell.
  • the first timer is turned off.
  • the first timer duration is configured to the UE through signaling by the network or a preset value specified by the protocol.
  • the terminal performs the RACH-less handover process according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resources, starts the first timer, and the additional terminal turns off the preset timer, which means turning off T304, and the terminal monitors the target cell The physical downlink control channel. Before the first timer expires, if the terminal monitors the signaling of the downlink control channel scrambled with the C-RNTI of the terminal, the first timer is turned off.
  • the terminal If the first timer expires and the terminal does not monitor the signaling of the downlink control channel scrambled with the C-RNTI of the terminal, it indicates that the terminal has not successfully accessed the target cell. At this time, the terminal performs a preset operation. Specifically, the preset operation includes one of the following: entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process; triggering the RRC reconstruction process.
  • the terminal performs the RACH-less handover process according to the network configuration, and fails to access the target cell during the valid period of the pre-configured uplink resource, turns off T304, turns on the first timer, and monitors the physical downlink control channel of the target cell.
  • the first timer expires, and the terminal does not monitor the signaling of the downlink control channel scrambled with the C-RNTI of the terminal, the RRC re-establishment process is triggered.
  • Case 3 The preset timer expires and the pre-configured uplink resource is valid.
  • the terminal fails to access the target cell before the preset timer expires. At this time, the uplink resources pre-configured by the target cell for the terminal are still valid, and the terminal can perform processing according to any one of methods 1 to 8:
  • Manner 1 The terminal triggers the RRC re-establishment process.
  • the terminal fails to access the target cell when accessing the target cell according to the network configuration. If the preset timer expires and the pre-configured uplink resource is valid, the terminal triggers the RRC reestablishment process, for example, the terminal performs the RACH-less handover process. T304 times out, the terminal fails to access the target cell, and the validity period of the uplink resource pre-configured by the network side for the terminal has not reached the end of the validity window, and the terminal triggers RRC reconstruction.
  • Method 2 The terminal enters the idle state.
  • the terminal fails to access the target cell when accessing the target cell according to the network configuration. If the preset timer expires and the pre-configured uplink resource is valid, it enters the idle state. For example, the terminal performs the RACH-less handover process and T304 times out , The terminal fails to access the target cell, and the validity period of the uplink resource pre-configured by the network side for the terminal has not reached the end of the validity window, and the terminal enters an idle state.
  • Method 3 The terminal triggers the NAS recovery process.
  • the terminal when the terminal accesses the target cell according to the network configuration, it fails to access the target cell. If the preset timer expires, the pre-configured uplink resource is valid, and the terminal triggers the NAS recovery process. For example, the terminal performs the RACH-less handover process, and T304 times out If the terminal fails to access the target cell, and the validity period of the uplink resource pre-configured by the network side for the terminal has not reached the end of the validity window, the terminal triggers the NAS recovery process.
  • Method 4 The terminal enters the idle state and triggers the NAS recovery process.
  • the terminal accesses the target cell according to the network configuration, it fails to access the target cell. If the preset timer expires, the pre-configured uplink resources are valid.
  • the NAS recovery process is triggered, for example, the terminal performs RACH-less During the handover process, T304 times out, the terminal fails to access the target cell, and the validity period of the uplink resource pre-configured for the terminal on the network side has not reached the end of the valid window, the terminal enters the idle state and triggers the NAS recovery process.
  • Manner 5 The terminal releases the uplink resources and triggers a random access procedure to access the target cell.
  • the terminal fails to access the target cell when accessing the target cell according to the network configuration. If the preset timer expires, the pre-configured uplink resource is valid and the terminal needs to release the uplink resource. And trigger a random access process to access the target cell. For example, when the terminal performs the RACH-less handover process, T304 times out, the terminal fails to access the target cell, and the validity period of the uplink resource pre-configured by the network for the terminal has not reached the end of the valid window, the terminal releases the uplink resource and triggers random access Access the target cell during the entry process.
  • the terminal if the target cell allocates dedicated random access resources to the terminal, the terminal triggers a non-contention random access process, that is, sending a dedicated preamble sequence to the target cell, or on the beam that the UE selects to access in the multi-beam scenario, the network If a dedicated random access resource is allocated to the UE, a non-contention random access process is triggered on the beam, otherwise a contention random access process is triggered. If the target cell does not allocate dedicated random access resources to the terminal, the terminal triggers a competitive random access process, that is, the terminal randomly selects a preamble sequence to send to the target cell. Alternatively, the terminal can ignore the random access resources allocated by the target cell and directly trigger the competing random access process.
  • the terminal RRC receives the random access failure indication information sent by the MAC (Media Access Control) layer, it means that the terminal has failed to randomly access the target cell.
  • the terminal needs to perform a preset operation.
  • the preset operation includes one of the following: entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process; triggering the RRC reconstruction process.
  • the target cell does not allocate random access resources for the terminal, and the terminal triggers a competing random access process to access the target cell, and sends a randomly selected preamble sequence to the target cell.
  • the terminal RRC receives the random access failure indication information sent by the MAC layer, the terminal triggers the RRC reestablishment process.
  • the target cell allocates dedicated random access resources to the terminal, and the terminal triggers a non-contention random access procedure to access the target cell, and sends a dedicated preamble sequence to the target cell.
  • the terminal RRC receives the random access failure indication information sent by the MAC layer, it enters the idle state.
  • Manner 6 The terminal releases the uplink resource and starts a second timer; the terminal triggers a random access procedure to access the target cell.
  • the terminal fails to access the target cell when accessing the target cell according to the network configuration. If the preset timer expires, the pre-configured uplink resource is valid and the terminal needs to release the uplink resource. And the terminal starts the second timer and triggers a random access procedure to access the target cell.
  • the second timer duration is configured by the network to the UE through signaling or a preset value specified by the protocol.
  • the target cell allocates dedicated random access resources to the terminal, a non-competitive random access process is triggered, or in a multi-beam scenario, the UE selects the beam for access, and the network allocates dedicated random access resources to the UE , The non-contention random access process is triggered on the beam, otherwise the contention random access process is triggered. If the target cell does not allocate dedicated random access resources for the terminal, a competing random access process is triggered. Alternatively, the terminal can ignore whether the target cell allocates random access resources, and only trigger the competing random access process.
  • the second timer is turned off.
  • the target cell allocates dedicated random access resources to the terminal.
  • the terminal executes the RACH-less handover process, T304 times out, the terminal fails to access the target cell, starts the second timer, and triggers a non-contention random access process to access the target cell.
  • the second timer is turned off.
  • the terminal performs a preset operation.
  • the preset operation is one of the following: enter the idle state; trigger the NAS recovery process; enter the idle state and trigger the NAS recovery process; trigger the RRC reconstruction process.
  • the target cell does not allocate dedicated random access resources for the terminal.
  • the terminal executes the RACH-less handover process, and T304 times out, the terminal fails to access the target cell, starts the second timer, and triggers the random access process of contention to be counted in the target cell.
  • the terminal does not access the target cell when the second timer expires, the terminal triggers the NAS recovery process.
  • Manner 7 The terminal starts the first timer to monitor the physical downlink control channel of the target cell.
  • the terminal fails to access the target cell when accessing the target cell according to the network configuration. If the preset timer expires, the pre-configured uplink resource is valid and the terminal needs to release the uplink resource. And the terminal starts the first timer to monitor the physical downlink control channel of the target cell.
  • the first timer duration is configured to the UE through signaling by the network or a preset value specified by the protocol.
  • the terminal monitors the signaling of the downlink control channel scrambled with the terminal's C-RNTI before the first timer expires, indicating that the terminal successfully accesses the target cell, the first timer is turned off.
  • the terminal performs the RACH-less handover process, T304 times out, the terminal fails to access the target cell, starts the first timer, and monitors the physical downlink control channel of the target cell. Before the first timer expires, if the terminal monitors the signaling of the downlink control channel scrambled with the terminal's C-RNTI, the first timer is turned off.
  • the terminal performs a preset operation.
  • the preset operation includes one of the following: entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process; triggering the RRC reconstruction process.
  • the terminal performs the RACH-less handover process, T304 times out, the terminal fails to access the target cell, starts the first timer, and monitors the physical downlink control channel of the target cell.
  • the first timer expires, and the terminal does not monitor the signaling of the downlink control channel scrambled with the C-RNTI of the terminal, the RRC re-establishment process is triggered.
  • Manner 8 The terminal sends uplink data in the uplink resource within the validity period of the uplink resource.
  • the terminal when the validity period of the uplink resource ends, the terminal performs one of the following operations: enters the idle state; triggers the NAS recovery process; enters the idle state and triggers the NAS recovery process; triggers the RRC reconstruction process;
  • the terminal when the terminal performs the RACH-less handover process, T304 times out, and the terminal fails to access the target cell and the pre-configured uplink resource is valid, the terminal sends uplink data in the uplink resource within the validity period of the uplink resource. If the terminal receives a PDCCH message scrambled with the terminal’s CRNTI or a response to a successful uplink data transmission, such as an ACK response message in the HARQ or ARQ process, the terminal successfully accesses the target cell; otherwise, the terminal fails after the uplink resource fails If the terminal fails to access the target cell, the terminal triggers the RRC re-establishment process.
  • Embodiment 1 RACH-less handover triggers a random access procedure.
  • Step 1 The source cell transparently transmits a handover command to the UE, where the handover command includes the uplink resource pre-configured by the target cell for the UE, and the pre-configured uplink resource is valid for a specified time.
  • Step 2 The UE starts the timer T304 after receiving the handover command, and initiates uplink transmission on the uplink resource pre-configured for the UE on the network side within a specified time to access the target cell.
  • Step 3 The UE fails to access the target cell within the specified time. For example, the PDCCH command scrambled with the UE C-RNTI is not received from the network side, and T304 has not timed out.
  • Step 4 The UE triggers the random access procedure.
  • Step 5 If the random access process is successful, turn off the timer T304, otherwise, if T034 times out and the terminal fails to access the target cell, perform a preset operation.
  • the preset operation includes one of the following: triggering the RRC reconstruction process; entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process.
  • step 4 may also be executed as turning off the timer T304, turning on the second timer, and the UE triggers the random access procedure.
  • step 5 can be performed as follows: if the UE successfully accesses the target cell before the second timer expires, the second timer is turned off.
  • step 5 may also be executed as if the second timer expires and the UE does not access the target cell, a preset operation is performed.
  • the preset operation includes one of the following: triggering the RRC reconstruction process; entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process.
  • step 4 can also be executed as restarting the timer T304 to trigger the random access process.
  • step 5 can be performed as follows: if the UE successfully accesses the target cell before T304 times out, turn off T304.
  • step 5 may also be executed as if T304 times out and the UE fails to access the target cell, then perform a preset operation.
  • the preset operation includes one of the following: triggering the RRC reconstruction process; entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process.
  • step 4 can also be executed as turning off the timer T304 to trigger the random access process.
  • step 5 may be executed as if the RRC receives the random access failure indication information sent by the MAC layer, it executes a preset operation.
  • the preset operation includes one of the following: triggering the RRC reconstruction process; entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process.
  • Embodiment 2 RACH-less handover triggers monitoring of the PDCCH of the target cell.
  • Step 1 The source cell transparently transmits a handover command to the UE, where the handover command includes the uplink resource pre-configured by the target cell for the UE, and the pre-configured uplink resource is valid for a specified time.
  • Step 2 The UE starts the timer T304 after receiving the handover command, and initiates uplink transmission on the uplink resource pre-configured for the UE on the network side within a specified time to access the target cell.
  • Step 3 The UE fails to access the target cell within the specified time. For example, the PDCCH command scrambled with the UE C-RNTI is not received from the network side, and T304 has not timed out.
  • Step 4 Monitor the PDCCH of the target cell.
  • Step 5 If the PDCCH order scrambled with the C-RNTI of the UE is monitored, turn off T304.
  • step 5 can also be executed as if T304 times out and the PDCCH order scrambled with the C-RNTI of the UE is not monitored, a preset operation is executed.
  • the preset operation includes one of the following: triggering the RRC reconstruction process; entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process.
  • step 4 may also be executed as turning off the timer T304, turning on the first timer, and monitoring the PDCCH of the target cell.
  • step 5 may be executed as if the PDCCH order scrambled with the C-RNTI of the UE is monitored, the first timer is turned off.
  • step 5 may also be executed as if T304 times out and the PDCCH order scrambled with the C-RNTI of the UE is not monitored, a preset operation is executed.
  • the preset operation includes one of the following: triggering the RRC reconstruction process; entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process.
  • step 4 can also be executed as restarting the timer T304 to monitor the PDCCH of the target cell.
  • step 5 can be executed as if the PDCCH order scrambled with the C-RNTI of the UE is monitored, then T304 is turned off.
  • step 5 may also be executed as if T304 times out and the PDCCH order scrambled with the C-RNTI of the UE is not monitored, a preset operation is executed.
  • the preset operation includes one of the following: triggering the RRC reconstruction process; entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process.
  • Embodiment 3 RACH-less handover, triggering the RRC reconstruction process or the NAS recovery process or entry idle state.
  • Step 1 The source cell transparently transmits a handover command to the UE, where the handover command includes the uplink resource pre-configured by the target cell for the UE, and the pre-configured uplink resource is valid for a specified time.
  • Step 2 The UE starts the timer T304 after receiving the handover command, and initiates uplink transmission on the uplink resource pre-configured for the UE on the network side within a specified time to access the target cell.
  • Step 3 The UE fails to access the target cell within the specified time. For example, the PDCCH command scrambled with the UE C-RNTI is not received from the network side, and T304 has not timed out.
  • Step 4 Turn off the T304 timer and perform the preset operation.
  • the preset operation includes one of the following: triggering the RRC reconstruction process; entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process.
  • Embodiment 4 RACH-less handover triggers monitoring of the PDCCH of the target cell.
  • Step 1 The source cell transparently transmits a handover command to the UE, where the handover command includes the uplink resource pre-configured by the target cell for the UE, and the pre-configured uplink resource is valid for a specified time.
  • Step 2 The UE starts the timer T304 after receiving the handover command, and initiates uplink transmission on the uplink resource pre-configured for the UE on the network side within a specified time to access the target cell.
  • Step 3 T304 timeout UE fails to access the target cell, the pre-configured uplink resources are still valid.
  • Step 4 Release the uplink resources, start the first timer, and monitor the PDCCH of the target cell.
  • Step 5 If the PDCCH order scrambled with the C-RNTI of the UE is monitored, the first timer is turned off.
  • step 5 may also be executed as if the PDCCH order scrambled with the C-RNTI of the UE is not monitored when the first timer expires, then a preset operation is executed.
  • the preset operation includes one of the following: enter the idle state; trigger the NAS recovery process; enter the idle state and trigger the NAS recovery process; trigger the RRC reconstruction process.
  • step 4 may also be performed to release uplink resources and perform a preset operation.
  • the preset operation includes one of the following: enter the idle state; trigger the NAS recovery process; enter the idle state and trigger the NAS recovery process; trigger the RRC reconstruction process.
  • step 4 may also be executed to send an uplink command according to the configured uplink resource within the validity period of the pre-configured uplink resource.
  • step 5 may be executed as receiving the PDCCH signaling scrambled with the C-RNTI of the UE or the response message for successfully sending the uplink data, such as the ACK response in the HARQ or ARQ process, and the access is successful.
  • step 5 may also be performed as if the PDCCH signaling scrambled with the C-RNTI of the UE is not received within the effective time of the uplink resource, then the access to the target cell is not successful, and the preset operation is performed.
  • the preset operation includes one of the following: enter the idle state; trigger the NAS recovery process; enter the idle state and trigger the NAS recovery process; trigger the RRC reconstruction process.
  • step 4 can also be executed as if the target cell is not accessed within the uplink resource effective time, the second timer is started to trigger the random access process. Then step 5 can be executed as if the random access process is completed before the second timer expires, the second timer is turned off, and the access is successful. Otherwise, step 5 can also be executed as: the second timer expires and the random access is not successful, then the preset operation is performed, where the preset operation includes one of the following: enter the idle state; trigger the NAS recovery process; enter the idle state , And trigger the NAS recovery process; trigger the RRC reconstruction process;.
  • step 4 can also be executed to trigger a random access procedure.
  • step 5 may be executed as if the RRC receives the random access indication information sent by the MAC layer, it executes a preset operation.
  • the preset operation includes one of the following: enter the idle state; trigger the NAS recovery process; enter the idle state and trigger the NAS recovery process; trigger the RRC reconstruction process.
  • Embodiment 5 T304 is not turned on, triggering to monitor the PDCCH of the target cell.
  • Step 1 The source cell transparently transmits a handover command to the UE, where the handover command includes the uplink resource pre-configured by the target cell for the UE, and the pre-configured uplink resource is valid for a specified time.
  • Step 2 The UE ignores the timer T304 after receiving the handover command, and initiates uplink transmission on the uplink resources pre-configured for the UE on the network side within a specified time to access the target cell.
  • Step 3 The UE fails to access the target cell within the specified valid time, for example, it fails to receive the PDCCH order scrambled with the C-RNTI of the UE sent by the network side.
  • Step 4 Start the first timer and monitor the PDCCH of the target cell.
  • Step 5 If the PDCCH order scrambled with the C-RNTI of the UE is monitored before the first timer expires, the first timer is turned off.
  • step 5 may also be executed as if the first timer expires and the PDCCH command scrambled with the C-RNTI of the UE is not monitored, a preset operation is executed.
  • the preset operation includes one of the following: enter the idle state; trigger the NAS recovery process; enter the idle state and trigger the NAS recovery process; trigger the RRC reconstruction process.
  • step 4 can also be executed to trigger a random access procedure.
  • step 5 may be executed as if the RRC receives the random access indication information sent by the MAC layer, it executes a preset operation.
  • the preset operation includes one of the following: enter the idle state; trigger the NAS recovery process; enter the idle state and trigger the NAS recovery process; trigger the RRC reconstruction process.
  • step 4 may also be executed as starting a second timer, and the UE triggers a random access procedure.
  • step 5 can be performed as follows: if the UE successfully accesses the target cell before the second timer expires, the second timer is turned off.
  • step 5 may also be executed as if the second timer expires and the UE does not access the target cell, a preset operation is performed.
  • the preset operation includes one of the following: triggering the RRC reconstruction process; entering the idle state; triggering the NAS recovery process; entering the idle state and triggering the NAS recovery process.
  • step 4 can also be executed to trigger the RRC re-establishment process. Or, enter the idle state; trigger the NAS recovery process; enter the idle state and trigger the NAS recovery process.
  • the embodiments of the present disclosure also provide a terminal. Since the terminal is the terminal in the method in the embodiment of the present invention, and the principle of the terminal to solve the problem is similar to the method, the implementation of the terminal can refer to the implementation of the method, and the repetition will not be repeated.
  • a terminal of an embodiment of the present disclosure includes:
  • the processor 3100 the memory 3101, and the transceiver 3102.
  • the processor 3100 is responsible for managing the bus architecture and general processing, and the memory 3101 can store data used by the processor 3100 when performing operations.
  • the transceiver 3102 is used to receive and send data under the control of the processor 3100.
  • the bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors 3100 represented by the processor 3100 and various circuits of the memory represented by the memory 3101 are linked together.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, power management circuits, etc., which are all known in the art, and therefore, no further descriptions are provided herein.
  • the bus interface provides the interface.
  • the processor 3100 is responsible for managing the bus architecture and general processing, and the memory 3101 can store data used by the processor 3100 when performing operations.
  • the process disclosed in the embodiment of the present invention may be applied to the processor 3100 or implemented by the processor 3100.
  • each step of the signal processing flow can be completed by hardware integrated logic circuits in the processor 3100 or instructions in the form of software.
  • the processor 3100 may be a general-purpose processor 3100, a digital signal processor 3100, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, which can implement or execute the implementation of the present invention
  • the general-purpose processor 3100 may be a microprocessor 3100 or any conventional processor 3100 or the like.
  • the steps of the method disclosed in the embodiment of the present invention may be directly embodied as being executed and completed by the hardware processor 3100, or executed and completed by a combination of hardware and software modules in the processor 3100.
  • the software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory 3101, and the processor 3100 reads the information in the memory 3101 and completes the steps of the signal processing flow in combination with its hardware.
  • the processor 3100 is configured to read the program in the memory 3101 and execute the following process:
  • processing is performed according to the state of the preset timer and/or the effective state of the pre-configured uplink resource.
  • the validity status of the pre-configured uplink resource is invalid
  • the processor 3100 is specifically configured to:
  • the second timer is started, and a random access procedure is triggered to access the target cell.
  • the state of the preset timer is not timed out, and the valid state of the pre-configured uplink resource is invalid;
  • the processor 3100 is specifically configured to:
  • the effective state of the pre-configured uplink resource is effective
  • the processor 3100 is specifically configured to:
  • the terminal Release the uplink resource and start a second timer; the terminal triggers a random access procedure to access the target cell; or,
  • processor 3100 is further configured to:
  • the preset operation includes one of the following:
  • processor 3100 is further configured to:
  • the second timer After starting the second timer and triggering the random access procedure to access the target cell, if the random access procedure is completed before the second timer expires, the second timer is turned off; or,
  • the preset operation includes one of the following:
  • processor 3100 is further configured to:
  • the preset operation includes one of the following:
  • processor 3100 is further configured to:
  • the preset timer After triggering the random access procedure to access the target cell, if the random access procedure is completed before the preset timer expires, the preset timer is turned off; or,
  • the preset operation includes one of the following:
  • processor 3100 is further configured to:
  • the preset timing is turned off ⁇ ;
  • the preset operation includes one of the following:
  • processor 3100 is further configured to:
  • the uplink resource After the uplink data is sent in the uplink resource within the validity period of the uplink resource, if during the validity period of the uplink resource, the signaling of the downlink control channel scrambled with the temporary identifier of the terminal is monitored or the successful uplink transmission is received Data response message, the uplink resource is released;
  • the preset operation includes one of the following:
  • the embodiment of the present invention also provides a processing device after a cell access failure, because this device is the device in the method in the embodiment of the present invention, and the principle of the device to solve the problem is the same as that The method is similar, so the implementation of the device can refer to the implementation of the method, and the repetition will not be repeated.
  • an embodiment of the present disclosure also provides a processing device after a cell access failure, the device including:
  • the access module 401 is used to access the target cell according to the network configuration
  • the processing module 402 is configured to perform processing according to the state of the preset timer and/or the effective state of the pre-configured uplink resource after the target cell is not successfully accessed.
  • the effective state of the pre-configured uplink resource is invalid
  • the processing module 402 is specifically configured to:
  • the second timer is started, and a random access procedure is triggered to access the target cell.
  • the state of the preset timer is not timed out, and the effective state of the pre-configured uplink resource is invalid;
  • the processing module 402 is specifically configured to:
  • the effective state of the pre-configured uplink resource is effective
  • the processing module 402 is specifically configured to:
  • the terminal Release the uplink resource and start a second timer; the terminal triggers a random access procedure to access the target cell; or,
  • processing module 402 is further configured to:
  • the preset operation includes one of the following:
  • processing module 402 is further configured to:
  • the second timer After starting the second timer and triggering the random access procedure to access the target cell, if the random access procedure is completed before the second timer expires, the second timer is turned off; or,
  • the preset operation includes one of the following:
  • processing module 402 is further configured to:
  • the preset operation includes one of the following:
  • processing module 402 is further configured to:
  • the preset timer After triggering the random access procedure to access the target cell, if the random access procedure is completed before the preset timer expires, the preset timer is turned off; or,
  • the preset operation includes one of the following:
  • processing module 402 is further configured to:
  • the preset timing is turned off ⁇ ;
  • the preset operation includes one of the following:
  • processing module 402 is further configured to:
  • the uplink resource After the uplink data is sent in the uplink resource within the validity period of the uplink resource, if within the validity period of the uplink resource, the signaling of the downlink control channel scrambled with the temporary identifier of the terminal is monitored or the successful uplink transmission is received. Data response message, the uplink resource is released;
  • the preset operation includes one of the following:
  • the embodiments of the present disclosure also provide a computer-readable non-volatile storage medium, including program code, when the program code runs on a computing terminal, the program code is used to make the computing terminal execute the foregoing implementation of the present invention Example of the steps of the method for reporting channel state information.
  • the present disclosure can also be implemented by hardware and/or software (including firmware, resident software, microcode, etc.).
  • the present disclosure may take the form of a computer program product on a computer-usable or computer-readable storage medium, which has a computer-usable or computer-readable program code implemented in the medium to be used by an instruction execution system or Used in conjunction with the instruction execution system.
  • a computer-usable or computer-readable medium can be any medium that can contain, store, communicate, transmit, or transfer a program for use by an instruction execution system, apparatus, or device, or in combination with an instruction execution system, Device or equipment use.

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

Abstract

La présente invention a trait au domaine technique des communications, et concerne un procédé et un dispositif pour effectuer un traitement après un échec d'accès à une cellule, étant utilisés pour résoudre le problème de la manière de réaliser un traitement lorsqu'un terminal ne parvient pas à accéder à une cellule après la période valide d'une ressource de liaison montante préconfigurée introduite dans un scénario de transfert sans canal d'accès aléatoire (RACH). Le procédé comprend les étapes suivantes : un terminal accède à une cellule cible selon une configuration de réseau ; et après l'échec d'accès à la cellule cible, le terminal effectue un traitement en fonction de l'état d'un temporisateur prédéfini et/ou de l'état valide d'une ressource de liaison montante préconfigurée. Le procédé décrit permet à un terminal, après avoir échoué à accéder à une cellule, d'effectuer un traitement en fonction de l'état d'un temporisateur préréglé et de l'état valide d'une ressource de liaison montante préconfigurée ou d'une combinaison des deux états.
PCT/CN2020/091379 2019-08-12 2020-05-20 Procédé et dispositif pour effectuer un traitement après un échec d'accès à une cellule WO2021027356A1 (fr)

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