CN112399453B - Method and device for processing cell after access failure - Google Patents

Method and device for processing cell after access failure Download PDF

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Publication number
CN112399453B
CN112399453B CN201910741368.6A CN201910741368A CN112399453B CN 112399453 B CN112399453 B CN 112399453B CN 201910741368 A CN201910741368 A CN 201910741368A CN 112399453 B CN112399453 B CN 112399453B
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Prior art keywords
terminal
target cell
timer
triggering
random access
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CN201910741368.6A
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CN112399453A (en
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许萌
梁靖
缪德山
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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Priority to CN201910741368.6A priority Critical patent/CN112399453B/en
Priority to PCT/CN2020/091379 priority patent/WO2021027356A1/en
Publication of CN112399453A publication Critical patent/CN112399453A/en
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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, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • 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

Abstract

The application provides a method and a device for processing after cell access failure, which are used for solving the problem how to process when a terminal accesses to a cell and fails after a preconfigured uplink resource is introduced under a RACH-LESS switching scene, and relates to the technical field of communication. The method comprises the following steps: the terminal accesses a target cell according to network configuration; and after the terminal is not successfully accessed to the target cell, processing according to the state of the preset timer and/or the effective state of the pre-configured uplink resource. The method enables the terminal to process according to the state of the preset timer, the effective state of the pre-configured uplink resource or the combination of the two states after the terminal fails to access the cell.

Description

Method and device for processing cell access failure
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for processing a cell access failure.
Background
In the prior art, when a UE (User Equipment) accesses a target cell, if the target cell configures a preconfigured uplink resource for the UE, the uplink resource is a periodic uplink resource, and resource waste is caused when the UE is accessed later.
Therefore, the UE needs to access the target cell within the pre-configured uplink resource validity time. However, if the UE misses the valid uplink resource, or fails to access the target cell within a specified time, there is no specific solution on how the UE should handle.
Disclosure of Invention
The application provides a method and a device for processing a cell after a cell access failure, which are suitable for solving the problem how to process a terminal when the cell access failure occurs after a RACH-LESS switching scene introduces a pre-configured uplink resource valid period.
In a first aspect, an embodiment of the present application provides a method for processing a cell after a cell access failure, including:
the terminal accesses a target cell according to network configuration;
and after the terminal is unsuccessfully accessed into the target cell, processing according to the state of the preset timer and/or the effective state of the preconfigured uplink resource.
The method enables the terminal to process according to the state of the preset timer, the effective state of the pre-configured uplink resource or the combination of the two states after the terminal fails to access the cell.
In a possible implementation manner, the valid state of the preconfigured uplink resource is invalid;
the terminal processes according to the effective state of the pre-configured uplink resource, including:
the terminal triggers a Radio Resource Control (RRC) reconstruction process; or the like, or, alternatively,
the terminal enters an idle state; or the like, or, alternatively,
the terminal triggers a non-access stratum (NAS) recovery process; or the like, or a combination thereof,
the terminal enters an idle state and triggers an NAS recovery process; or the like, or a combination thereof,
the terminal triggers a random access process to access the target cell; or the like, or a combination thereof,
the terminal starts a first timer and monitors a physical downlink control channel of the target cell; or the like, or a combination thereof,
and the terminal starts a second timer and triggers a random access process to access the target cell.
The method enables the terminal to perform subsequent processing operation according to the effective state of the pre-configured uplink resource after the access of the terminal to the cell fails.
In a possible implementation manner, the state of the preset timer is not overtime, and the valid state of the preconfigured uplink resource is invalid;
the terminal processes according to the state of the preset timer and the effective state of the pre-configured uplink resource, and the processing comprises the following steps:
the terminal triggers a random access process to access a target cell; or the like, or, alternatively,
the terminal closes the preset timer and triggers a random access process to access the target cell; or the like, or a combination thereof,
the terminal resets the preset timer and triggers a random access process to access the target cell; or the like, or a combination thereof,
the terminal starts a second timer and triggers a random access process to access the target cell; or the like, or a combination thereof,
the terminal monitors a physical downlink control channel of the target cell; or the like, or, alternatively,
the terminal resets the preset timer and monitors a physical downlink control channel of the target cell; or the like, or a combination thereof,
and the terminal starts a first timer and monitors a physical downlink control channel of the target cell.
According to the method, the terminal can execute subsequent processing operation according to the state of the preset timer and the effective state of the pre-configured uplink resource after the access of the terminal to the cell fails.
In a possible implementation manner, if the state of the preset timer is timeout, the valid state of the preconfigured uplink resource is valid;
processing according to the state of the preset timer and the effective state of the preconfigured uplink resource, comprising:
the terminal triggers an RRC reestablishment process; or the like, or a combination thereof,
the terminal enters an idle state; or the like, or a combination thereof,
the terminal triggers an NAS recovery process; or the like, or a combination thereof,
the terminal enters an idle state and triggers an NAS recovery process; or the like, or, alternatively,
the terminal releases the uplink resource and triggers a random access process to access the target cell; or the like, or, alternatively,
the terminal releases the uplink resource and starts a second timer; the terminal triggers a random access process to access the target cell; or the like, or, alternatively,
the terminal starts a first timer and monitors a physical downlink control channel of the target cell; or the like, or a combination thereof,
and the terminal transmits uplink data in the uplink resource in the validity period of the uplink resource.
According to the method, the terminal can execute subsequent processing operation according to the state of the preset timer and the effective state of the pre-configured uplink resource after the access of the terminal to the cell fails.
In a possible implementation manner, after the terminal starts a first timer and monitors a physical downlink control channel of the target cell, the method further includes:
if the terminal monitors the signaling of the downlink control channel scrambled by the temporary identifier of the terminal before the first timer is overtime, the terminal closes the first timer; or the like, or, alternatively,
if the first timer is overtime and the terminal does not monitor the signaling of the downlink control channel scrambled by the temporary identifier of the terminal, the terminal executes preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
The method enables the terminal to execute subsequent processing operation according to the state of the preset timer, or the effective state of the preconfigured uplink resource, or the state of the preset timer and the effective state of the preconfigured uplink resource after the terminal fails to access the cell.
In a possible implementation manner, after the terminal starts the second timer and triggers a random access procedure to access the target cell, the method further includes:
if the terminal completes the random access process before the second timer is overtime, the terminal closes the second timer; or the like, or, alternatively,
if the second timer is overtime and the terminal is not accessed to the target cell, the terminal executes preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
the RRC reestablishment procedure is triggered.
The method enables the terminal to execute subsequent processing operation according to the state of the preset timer and the effective state of the preconfigured uplink resource or by combining the state of the preset timer and the effective state of the preconfigured uplink resource after the terminal fails to access the cell.
In a possible implementation manner, after the terminal triggers a random access procedure to access the target cell, the method further includes:
if the MAC layer of the terminal indicates that the random access fails, the terminal executes preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
The method enables the terminal to execute subsequent processing operation according to the state of the preset timer and the effective state of the preconfigured uplink resource or in combination with the state of the preset timer and the effective state of the preconfigured uplink resource after the terminal fails to access the cell.
In a possible implementation manner, after the terminal triggers a random access procedure to access the target cell, the method further includes:
if the terminal completes the random access process before the preset timer is overtime, the terminal closes the preset timer; or the like, or a combination thereof,
if the preset timer is overtime and the terminal is not accessed to the target cell, the terminal executes preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
According to the method, the terminal can execute subsequent processing operation according to the state of the preset timer and the effective state of the pre-configured uplink resource after the access of the terminal to the cell fails.
In a possible implementation manner, after the terminal monitors a physical downlink control channel of the target cell, the method further includes:
if the terminal monitors a signaling of a downlink control channel scrambled by a temporary identifier of the terminal before the preset timer is overtime, the terminal closes the preset timer; or the like, or, alternatively,
if the preset timer is overtime and the terminal does not monitor the signaling of the downlink control channel scrambled by the temporary identifier of the terminal, the terminal executes preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
The method enables the terminal to execute subsequent processing operation 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.
In a possible implementation manner, after the terminal transmits uplink data in the uplink resource within the validity period of the uplink resource, the method further includes:
if the terminal monitors the signaling of the downlink control channel scrambled by the temporary identifier of the terminal or receives a response message for successfully sending uplink data during the period that the uplink resource is effective, the terminal releases the uplink resource;
if the validity period of the uplink resource is over, the terminal does not monitor the signaling of the downlink control channel scrambled by the temporary identifier of the terminal or receives a response message of successfully sending the uplink data, and then the terminal executes preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering the NAS layer recovery process;
triggering the RRC reestablishment procedure.
According to the method, the terminal can execute subsequent processing operation according to the state of the preset timer and the effective state of the pre-configured uplink resource after the access of the terminal to the cell fails.
In a second aspect, an embodiment of the present application provides a terminal, including: a processor and a memory;
the processor is used for reading the program in the memory and executing the following processes:
accessing a target cell according to network configuration;
and after the target cell is not successfully accessed, processing according to the state of the preset timer and/or the effective state of the preconfigured uplink resource.
In a possible implementation manner, the valid state of the preconfigured uplink resource is invalid;
the processor is specifically configured to:
triggering a Radio Resource Control (RRC) reconstruction process; or the like, or, alternatively,
entering an idle state; or the like, or, alternatively,
triggering a non-access stratum (NAS) recovery process; or the like, or, alternatively,
entering an idle state and triggering an NAS recovery process; or the like, or a combination thereof,
triggering a random access process to access the target cell; or the like, or, alternatively,
starting a first timer and monitoring a physical downlink control channel of the target cell; or the like, or a combination thereof,
and starting a second timer and triggering a random access process to access the target cell.
In a possible implementation manner, the state of the preset timer is not overtime, and the valid state of the preconfigured uplink resource is invalid;
the processor is specifically configured to:
triggering a random access process to access a target cell; or the like, or a combination thereof,
closing the preset timer and triggering a random access process to access the target cell; or the like, or, alternatively,
resetting the preset timer and triggering a random access process to access the target cell; or the like, or a combination thereof,
starting a second timer and triggering a random access process to access the target cell; or the like, or, alternatively,
monitoring a physical downlink control channel of the target cell; or the like, or, alternatively,
resetting the preset timer and monitoring a physical downlink control channel of the target cell; or the like, or, alternatively,
and starting a first timer and monitoring a physical downlink control channel of the target cell.
In a possible implementation manner, if the state of the preset timer is overtime, the valid state of the preconfigured uplink resource is valid;
the processor is specifically configured to:
triggering an RRC reestablishment process; or the like, or a combination thereof,
entering an idle state; or the like, or, alternatively,
triggering an NAS recovery process; or the like, or, alternatively,
entering an idle state and triggering an NAS recovery process; or the like, or, alternatively,
releasing the uplink resource and triggering a random access process to access the target cell; or the like, or, alternatively,
releasing the uplink resource and starting a second timer; the terminal triggers a random access process to access the target cell; or the like, or, alternatively,
starting a first timer and monitoring a physical downlink control channel of the target cell; or the like, or a combination thereof,
and sending uplink data in the uplink resource in the validity period of the uplink resource.
In one possible implementation, the processor is further configured to:
starting a first timer, after monitoring a physical downlink control channel of the target cell, if a signaling of the downlink control channel scrambled by a temporary identifier of the terminal is monitored before the first timer is overtime, closing the first timer; or the like, or a combination thereof,
if the first timer is overtime and the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is not monitored, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
In one possible implementation, the processor is further configured to:
starting a second timer, triggering a random access process to access the target cell, and closing the second timer if the random access process is completed before the second timer is overtime; or the like, or a combination thereof,
if the second timer is overtime and the target cell is not accessed, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
In one possible implementation, the processor is further configured to:
after a random access process is triggered to access the target cell, if the MAC layer of the terminal indicates that the random access fails, executing a preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
the RRC reestablishment procedure is triggered.
In one possible implementation, the processor is further configured to:
after a random access process is triggered to access the target cell, if the random access process is completed before the preset timer is overtime, the preset timer is closed; or the like, or, alternatively,
if the preset timer is overtime and the target cell is not accessed, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
In one possible implementation, the processor is further configured to:
after monitoring the physical downlink control channel of the target cell, if the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is monitored before the preset timer is overtime, closing the preset timer; or the like, or, alternatively,
if the preset timer is overtime and the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is not monitored, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
In one possible implementation, the processor is further configured to:
after the uplink resource sends uplink data in the validity period of the uplink resource, if a signaling of a downlink control channel scrambled by a temporary identifier of the terminal is monitored or a response message of successfully sending the uplink data is received in the validity period of the uplink resource, releasing the uplink resource;
if the period of validity of the uplink resource is over, the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is not monitored or a response message of successfully sending the uplink data is not received, and then a preset operation is executed;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering the NAS layer recovery process;
the RRC reestablishment procedure is triggered.
In a third aspect, an embodiment of the present application further provides a device for processing after a cell access failure, including:
the access module is used for accessing the target cell according to the network configuration;
and the processing module is used for processing according to the state of the preset timer and/or the effective state of the preconfigured uplink resource after the target cell is not successfully accessed.
In a possible implementation manner, the valid state of the preconfigured uplink resource is invalid;
the processing module is specifically configured to:
triggering a Radio Resource Control (RRC) reestablishment process; or the like, or, alternatively,
entering an idle state; or the like, or, alternatively,
triggering a non-access stratum (NAS) recovery process; or the like, or a combination thereof,
entering an idle state and triggering an NAS recovery process; or the like, or, alternatively,
triggering a random access process to access the target cell; or the like, or, alternatively,
starting a first timer, and monitoring a physical downlink control channel of the target cell; or the like, or, alternatively,
and starting a second timer and triggering a random access process to access the target cell.
In a possible implementation manner, the state of the preset timer is not overtime, and the valid state of the preconfigured uplink resource is invalid;
the processing module is specifically configured to:
triggering a random access process to access a target cell; or the like, or, alternatively,
closing the preset timer and triggering a random access process to access the target cell; or the like, or, alternatively,
resetting the preset timer and triggering a random access process to access the target cell; or the like, or, alternatively,
starting a second timer and triggering a random access process to access the target cell; or the like, or, alternatively,
monitoring a physical downlink control channel of the target cell; or the like, or, alternatively,
resetting the preset timer and monitoring a physical downlink control channel of the target cell; or the like, or a combination thereof,
and starting a first timer and monitoring a physical downlink control channel of the target cell.
In a possible implementation manner, if the state of the preset timer is overtime, the valid state of the preconfigured uplink resource is valid;
the processing module is specifically configured to:
triggering an RRC reestablishment process; or the like, or, alternatively,
entering an idle state; or the like, or, alternatively,
triggering an NAS recovery process; or the like, or, alternatively,
entering an idle state and triggering an NAS recovery process; or the like, or, alternatively,
releasing the uplink resource and triggering a random access process to access the target cell; or the like, or, alternatively,
releasing the uplink resource and starting a second timer; the terminal triggers a random access process to access the target cell; or the like, or, alternatively,
starting a first timer, and monitoring a physical downlink control channel of the target cell; or the like, or, alternatively,
and sending uplink data in the uplink resource in the validity period of the uplink resource.
In one possible implementation manner, the processing module is further configured to:
starting a first timer, after monitoring a physical downlink control channel of the target cell, if a signaling of the downlink control channel scrambled by a temporary identifier of the terminal is monitored before the first timer is overtime, closing the first timer; or the like, or, alternatively,
if the first timer is overtime and the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is not monitored, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
the RRC reestablishment procedure is triggered.
In one possible implementation, the processing module is further configured to:
starting a second timer, triggering a random access process to access the target cell, and closing the second timer if the random access process is completed before the second timer is overtime; or the like, or a combination thereof,
if the second timer is overtime and the target cell is not accessed, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
In one possible implementation manner, the processing module is further configured to:
after a random access process is triggered to access the target cell, if the MAC layer of the terminal indicates that the random access fails, executing a preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
In one possible implementation, the processing module is further configured to:
after a random access process is triggered to access the target cell, if the random access process is completed before the preset timer is overtime, the preset timer is closed; or the like, or, alternatively,
if the preset timer is overtime and the target cell is not accessed, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
In one possible implementation manner, the processing module is further configured to:
after monitoring the physical downlink control channel of the target cell, if the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is monitored before the preset timer is overtime, closing the preset timer; or the like, or a combination thereof,
if the preset timer is overtime and the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is not monitored, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
In one possible implementation manner, the processing module is further configured to:
after the uplink resource sends uplink data in the validity period of the uplink resource, if a signaling of a downlink control channel scrambled by a temporary identifier of the terminal is monitored or a response message for successfully sending the uplink data is received in the validity period of the uplink resource, releasing the uplink resource;
if the period of validity of the uplink resource is over, the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is not monitored or a response message of successfully sending the uplink data is not received, and then a preset operation is executed;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS layer recovery process;
triggering the RRC reestablishment procedure.
In a fourth aspect, the present application further provides a computer storage medium having a computer program stored thereon, which when executed by a processing unit, performs the steps of the method of the first aspect.
In addition, for technical effects brought by any one implementation manner of the second aspect to the fourth aspect, reference may be made to technical effects brought by different implementation manners of the first aspect, and details are not described herein again.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a timing diagram illustrating a handover of a UE to a cell in the related art;
fig. 2 is a flowchart of a processing method after a cell access failure in an embodiment of the present application;
fig. 3 is a schematic diagram of a terminal in an embodiment of the present application;
fig. 4 is a schematic diagram illustrating a processing apparatus after a cell access failure in an embodiment of the present application.
Detailed Description
Hereinafter, some terms in the embodiments of the present application are explained so as to be easily understood by those skilled in the art.
1. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In order to clearly understand the technical solutions provided in the embodiments of the present application, the following describes a procedure of performing cell handover by a UE in the related art.
Referring to fig. 1, a timing diagram illustrating handover of a UE in a related art may include the following steps:
step 101: and the UE reports the 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 be switched to the target Cell, and a new C-RNTI (Cell Radio Network Temporary Identifier) is allocated to the UE. And if the target cell determines to configure the RACH-LESS for the UE, generating a switching command containing the indication information of the RACH-skip.
In implementation, the handover command may further include TA (Timing Advance) information. Optionally, the target cell may also allocate a preconfigured uplink resource to the UE, and the handover command may further include information of the preconfigured uplink resource.
Step 105: and the target cell sends a switching request response carrying the switching command to the source cell.
Step 106: the source cell sends a handover command to the UE.
Step 107: the UE starts a timer T304, configures the UE according to the switching command and synchronizes to the target cell; and sending the uplink message according to the TA information carried in the switching command.
Step 108: if the target cell allocates the preconfigured uplink resource for the UE, the UE sends uplink data in the preconfigured uplink resource, that is, the UE starts sending a handover complete message to the target cell on the first valid PUSCH.
Step 109: the UE monitors the PDCCH of the target cell.
Step 110: the UE stops the timer T304 when monitoring signaling of the PDCCH scrambled with the C-RNTI of the UE.
In implementation, step 108 may also be implemented such that, if the target cell does not allocate the preconfigured uplink resource to the UE, the UE monitors the PDCCH message of the target cell. Step 109 may be performed to stop the timer T304 when the UE monitors signaling of a PDCCH scrambled with the C-RNTI of the UE. Step 110 may be performed to transmit a handover complete message to the UE according to the uplink resource allocated by the PDCCH.
In implementation, if T304 times out, the UE fails to receive the PDCCH order scrambled by the C-RNTI of the UE. Step 108 may be performed to trigger an RRC reestablishment procedure for the UE.
It can be seen that, after the validity period of the preconfigured uplink resource is introduced in the related art, if the UE misses the uplink resource configured for the UE by the target cell, or if the timer T304 is overtime and the UE does not successfully access the target cell, how the UE should handle the uplink resource needs to be solved.
Based on the above requirements, a method for processing a cell after a cell access failure is provided in this embodiment. In the method, for example, when a terminal performs cell switching, or when a terminal configured with dual connectivity changes in a primary cell PSCell of a secondary cell group, if the terminal does not successfully access a target PCell or PSCell cell, the terminal performs processing according to a state of a handover control or synchronous reconfiguration timer, an effective state of a preconfigured uplink resource, or both states.
By the method, when the UE is not successfully accessed to the target cell, corresponding processing can be performed according to the state of the preset timer and the effective state of the preconfigured uplink resource.
In the embodiment of the application, the terminal is a device with a wireless communication function, and can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal can be a Mobile Phone (Mobile Phone), a tablet personal computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal, an Augmented Reality (AR) terminal, a wireless terminal in Industrial Control (Industrial Control), a wireless terminal in unmanned Driving (Self Driving), a wireless terminal in Remote Medical treatment (Remote Medical), a wireless terminal in Smart Grid (Smart Grid), a wireless terminal in Transportation Safety (Transportation Safety), a wireless terminal in Smart City (Smart City), a wireless terminal in Home (Smart Home), and the like; but also UEs in various forms, mobile Stations (MSs), and terminals (Terminal devices).
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, a flowchart of a processing method after a cell access failure in the embodiment of the present application may include the following steps:
step 201: and the terminal accesses the target cell according to the network configuration.
In implementation, the terminal may perform a handover procedure or a primary cell PCell synchronous reconfiguration procedure according to the handover command or the synchronous reconfiguration command. Or, the method may also be a process of configuring PSCell change or synchronous reconfiguration of a dual-connection terminal, but is not limited to the above two scenarios, and may be applicable to scenarios in which the UE needs to perform uplink synchronization, such as uplink desynchronization when downlink data arrives, and secondary cell addition.
Step 202: and after the terminal is unsuccessfully accessed into the target cell, processing according to the state of the preset timer and/or the effective state of the preconfigured uplink resource.
In particular, the preset timer may be a timer for controlling handover or a timer for controlling synchronization reconfiguration or a timer for controlling PSCell change, such as a T304 timer or a T307 timer.
The method enables the UE to be processed according to the state of the preset timer, or the effective state of the pre-configured uplink resource, or the combination of the two states after the UE fails to access the cell.
The above step 202 can be performed according to the following three different situations, which will be described in detail below.
The first condition is as follows: the pre-configured uplink resource is invalid.
In specific implementation, the target cell may allocate uplink resources to the terminal, and carry information of the preconfigured uplink resources in the handover command. And the terminal sends uplink data according to the configured uplink resources in the effective period of the preconfigured uplink resources, and if the terminal does not receive a PDCCH command scrambled by the C-RNTI of the UE or does not receive a response message of successful sending of the uplink data, such as an ACK response message of an ARQ or HARQ process, in the effective period of the uplink resources, the terminal does not successfully access the target cell. When the pre-configured uplink resource validity period ends, the terminal may perform processing according to any one of the manners 1 to 7:
mode 1: the terminal triggers the RRC reestablishment procedure.
In implementation, the terminal selects a reestablishment cell and triggers a reestablishment procedure to recover the RRC connection in the selected cell, for example, the terminal selects to initiate an RRC reestablishment procedure in the source cell to recover the RRC connection in the source cell.
Mode 2: the terminal enters an idle state.
For example, when the terminal performs target cell access according to network configuration, if the target cell is not successfully accessed in the valid period of the preconfigured uplink resource, the terminal enters an idle state, and the UE enters the idle state and can reselect the cell for access.
Mode 3: the terminal triggers a non-access stratum (NAS) recovery process.
When the terminal accesses the target cell according to the network configuration, the terminal does not successfully access the target cell in the effective period of the preconfigured uplink resource, and the terminal can trigger the NAS recovery process and trigger a new cell access process by the NAS.
Mode 4: the terminal enters an idle state and triggers the NAS recovery process.
For example, when the terminal accesses the target cell according to the network configuration, if the target cell is not successfully accessed during the valid period of the preconfigured uplink resource, the RRC layer releases the air interface connection to enter the idle state, and simultaneously notifies the NAS to trigger the NAS recovery process, and the NAS triggers a new cell access process.
Mode 5: and the terminal triggers a random access process to access the target cell.
When the method is implemented, when a terminal accesses a target cell according to network configuration, the target cell is not successfully accessed in the effective period of pre-configured uplink resources, if the target cell allocates a special random access resource for the terminal, the terminal triggers a non-competitive random access process, namely, a special leader sequence is sent to the target cell, or a UE selects an accessed beam under a multi-beam scene, the network allocates the special random access resource for the UE, the non-competitive random access process is triggered on the beam, otherwise, the competitive random access process is triggered. If the target cell does not allocate the dedicated random access resource 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. Or, the terminal may ignore the dedicated random access resource allocated by the target cell, and directly trigger the contention random access procedure.
If the MAC (Media Access Control) layer of the terminal indicates that the random Access fails, it indicates that the terminal fails to Access the target cell randomly. At this time, the terminal needs to perform a preset operation. Specifically, the preset operation includes one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; the RRC reestablishment procedure is triggered.
For example, the target cell does not allocate random access resources to the terminal, the terminal triggers a contention random access procedure to access the target cell, and sends a randomly selected preamble sequence to the target cell. When the RRC layer of the terminal receives the indication information of the random access failure sent by the MAC layer, the terminal triggers the RRC reestablishment process.
For another example, the target cell allocates a dedicated random access resource 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. And when the RRC layer of the terminal receives the indication information of the random access failure sent by the MAC layer, the terminal enters an idle state.
Mode 6: and the terminal starts a first timer and monitors a physical downlink control channel of the target cell.
In specific implementation, when the target Cell allows the terminal to be switched to the target Cell, a new UE ID, that is, a new C-RNTI (Cell-Radio Network Temporary Identifier) is allocated to the terminal.
And if the terminal monitors the signaling of the downlink control channel scrambled by the C-RNTI of the terminal before the first timer is overtime, indicating that the terminal is successfully accessed into the target cell, closing the first timer. The first timer duration is a preset value configured to the UE by the network through signaling or specified by a protocol. For example, when the terminal accesses the target cell according to the network configuration, if the terminal does not successfully access the target cell during the validity period of the preconfigured uplink resource, the terminal starts a first timer and monitors a physical downlink control channel of the target cell. And before the first timer is overtime, the terminal monitors the signaling of the downlink control channel scrambled by the C-RNTI of the terminal, and then the first timer is closed.
If the first timer is overtime, the terminal does not monitor the signaling of the downlink control channel scrambled by the C-RNTI of the terminal, which indicates that the terminal does not successfully access the target cell. At this time, the terminal performs a preset operation. Specifically, the preset operation includes one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; the RRC reestablishment procedure is triggered.
For example, when the terminal accesses the target cell according to the network configuration, the terminal does not successfully access the target cell during the validity period of the preconfigured uplink resource, and the terminal starts a first timer and monitors a physical downlink control channel of the target cell. And if the first timer is overtime and the terminal does not monitor the signaling of the downlink control channel scrambled by the C-RNTI of the terminal, triggering the RRC reestablishment process.
Mode 7: and the terminal starts a second timer and triggers a random access process to access the target cell.
When the terminal accesses the target cell according to the network configuration, if the terminal does not successfully access the target cell in the effective period of the preconfigured uplink resource, the terminal starts a second timer and triggers the random access process to access the target cell. Specifically, if the target cell allocates a dedicated random access resource to the terminal, a non-contention random access process is triggered, or a beam selected to be accessed by the UE in a multi-beam scene is allocated by the network, and a dedicated random access resource is allocated to the UE by the network, a 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 contention random access procedure is triggered. Or, the terminal may ignore whether the target cell allocates the dedicated random access resource, and only trigger the contention random access procedure. The duration of the second timer is a preset value configured to the UE by the network through signaling or specified by a protocol.
And if the terminal completes the random access process before the second timer is overtime, and the UE accesses the target cell, closing the second timer.
For example, the target cell allocates a dedicated random access resource for the terminal. And when the terminal accesses the target cell according to the network configuration and does not successfully access the target cell in the effective period of the preconfigured uplink resources, the terminal starts a second timer and triggers a non-competitive random access process to access the target cell. And the terminal completes the random access process before the second timer is overtime, and then closes the second timer.
And if the second timer is overtime, the random access process is not finished, and the UE does not access the target cell, the terminal executes preset operation. Wherein the preset operation is one of: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; triggering the RRC reestablishment procedure.
For example, the target cell allocates random access resources to the terminal. And when the terminal accesses the target cell according to the network configuration and does not successfully access the target cell in the effective period of the preconfigured uplink resources, the terminal starts a second timer and triggers a competitive random access process to be added into the target cell. And when the second timer is overtime, the terminal does not access the target cell, and the terminal enters an idle state and triggers the NAS recovery process.
Case two: if the preset timer is not overtime, the pre-configured uplink resource is invalid.
In specific implementation, during the period that the uplink resource allocated by the target cell to the terminal is valid, the terminal sends uplink data in the configured uplink resource, but the terminal does not receive the PDCCH scrambled by the C-RNTI of the terminal, or does not successfully receive a response message of uplink data transmission, for example, an ACK response in HARQ or an ACK response in an ARQ process, and the terminal does not successfully access the target cell. When the preset timer is not overtime and the preconfigured uplink resource is invalid, the terminal may perform processing according to any one of the following modes 1 to 7:
mode 1: the terminal triggers a random access process to access the target cell.
Specifically, the terminal triggers a random access procedure, and if the terminal completes the random access procedure before the preset timer expires, the UE successfully accesses the target cell, and the preset timer may be closed.
For example, the terminal performs a RACH-less handover procedure according to the network configuration, and fails to access the target cell during the validity period of the preconfigured uplink resource, at this time, T304 does not time out, and the preconfigured uplink resource is invalid. The terminal triggers the random access process to access the target cell, the terminal completes the random access before T304 is overtime, the target cell is successfully accessed, and the terminal closes T304.
And if the preset timer is overtime and the terminal is not successfully accessed to the target cell, the terminal executes preset operation. Wherein the preset operation comprises one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; triggering the RRC reestablishment procedure.
For example, the terminal performs a RACH-less handover procedure according to the network configuration, and fails to access the target cell during the validity period of the preconfigured uplink resource, at this time, T304 does not time out, and the preconfigured uplink resource is invalid. And the terminal triggers a random access process to access the target cell, and if the T304 is overtime, the random access process is not completed and the terminal does not successfully access the target cell, the RRC reestablishment process is triggered.
Or, the MAC layer may control to determine whether the random access procedure is successful and whether the terminal successfully accesses the target cell. Specifically, if the RRC layer of the terminal receives the indication information of the random access failure sent by the MAC layer, the terminal executes a preset operation. Wherein the preset operation comprises one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; triggering the RRC reestablishment procedure.
For example, the terminal performs a RACH-less handover procedure according to network configuration, fails to access the target cell during the validity period of the preconfigured uplink resource, and fails to time out T304, and invalidates the preconfigured uplink resource. The terminal triggers the random access process to access the target cell, the terminal RRC layer receives the indication information of the random access failure sent by the MAC layer, and the RRC layer enters an idle state after learning the random access failure.
Mode 2: and the terminal closes the preset timer and triggers a random access process to access the target cell.
In implementation, if the target cell allocates a dedicated random access resource to the terminal, the terminal triggers a non-contention random access process, that is, sends a dedicated preamble sequence to the target cell, or on a beam selected to be accessed by the UE in a multi-beam scene, the network allocates the dedicated random access resource to the UE, and triggers the non-contention random access process on the beam, otherwise, triggers the contention random access. If the target cell does not allocate 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. Or, the terminal may ignore the random access resource allocated by the target cell, and directly trigger the contention random access procedure.
Specifically, if the MAC layer of the terminal indicates that the random access fails, a preset operation is performed. Specifically, the preset operation includes one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; triggering the RRC reestablishment procedure.
For example, the terminal performs a RACH-less handover procedure according to the network configuration, and fails to access the target cell during the validity period of the preconfigured uplink resource, at this time, T304 does not time out, and the preconfigured uplink resource is invalid. And the terminal triggers a random access process to access the target cell, and the RRC receives indication information of random access failure sent by the MAC layer and triggers an RRC reestablishment process.
For another example, the terminal performs a RACH-less handover procedure according to the network configuration, and fails to access the target cell during the validity period of the preconfigured uplink resource, at this time, T304 does not time out, and the preconfigured uplink resource is invalid. The terminal triggers a random access process to access the target cell and successfully accesses the target cell.
Mode 3: and the terminal resets the preset timer and triggers a random access process to access the target cell.
In implementation, if the target cell allocates a dedicated random access resource to the terminal, the terminal triggers a non-contention random access process, that is, sends a dedicated preamble sequence to the target cell, or on a beam selected to be accessed by the UE in a multi-beam scene, the network allocates the dedicated random access resource to the UE, and triggers the non-contention random access process on the beam, otherwise, triggers the contention random access. If the target cell does not allocate the dedicated random access resource 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. Or, the terminal may ignore the random access resource allocated by the target cell and directly trigger the contention random access procedure.
For example, the terminal performs a RACH-less handover procedure according to the network configuration, and fails to access the target cell during the validity period of the preconfigured uplink resource, at this time, T304 does not time out, and the preconfigured uplink resource is invalid. The terminal resets the preset timer, i.e. resets T304, and triggers the random access procedure to access the target cell.
And if the terminal successfully accesses the target cell before the preset timer is overtime, closing the preset timer. And if the preset timer is overtime and the terminal is not successfully accessed to the target cell, executing preset operation. Wherein the preset operation comprises one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; triggering the RRC reestablishment procedure.
Mode 4: and the terminal starts a second timer and triggers a random access process to access the target cell.
In implementation, if a target cell allocates a dedicated random access resource to a terminal, the terminal triggers a non-contention random access process, that is, a dedicated preamble sequence is sent to the target cell, or a beam selected by the UE to be accessed in a multi-beam scene is allocated by a network to the UE, 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 the dedicated random access resource 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. Or, the terminal may ignore the random access resource allocated by the target cell, and directly trigger the contention random access procedure. The duration of the second timer is a preset value which is configured to the UE by the network through signaling or is specified by a protocol.
Specifically, for example, the terminal performs a RACH-less handover procedure according to network configuration, and if the target cell is not successfully accessed during the valid period of the preconfigured uplink resource, the terminal starts a second timer to trigger a random access procedure to access the target cell. And if the terminal completes the random access process before the second timer is overtime, and the terminal successfully accesses the target cell, closing the second timer. And if the second timer is overtime and the target cell is not successfully accessed, executing preset operation. Wherein the preset operation comprises one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; the RRC reestablishment procedure is triggered.
For example, the terminal performs a RACH-less handover procedure according to network configuration, fails to access the target cell during the validity period of the preconfigured uplink resource, starts a second timer, and triggers a random access procedure to access the target cell. And before the second timer is overtime, the random access process is not completed, and the terminal does not successfully access the target cell and enters an idle state.
Mode 5: and the terminal monitors the physical downlink control channel of the target cell.
In implementation, if the terminal monitors the signaling of the downlink control channel scrambled by the C-RNTI of the terminal before the preset timer is overtime, the preset timer is closed. And if the preset timer is overtime and the terminal does not monitor the signaling of the downlink control channel scrambled by the C-RNTI of the terminal, executing the preset operation. Wherein, the preset operation comprises: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; triggering the RRC reestablishment procedure.
For example, the terminal performs a RACH-less handover procedure according to network configuration, fails to access the target cell during the validity period of the preconfigured uplink resource, and monitors a physical downlink control channel of the target cell. And the terminal monitors the signaling of the downlink control channel scrambled by the C-RNTI of the terminal before the preset timer T304 is overtime, and then closes the preset timer.
Mode 6: and the terminal resets the preset timer and monitors the physical downlink control channel of the target cell.
In implementation, if the terminal monitors the signaling of the downlink control channel scrambled by the C-RNTI of the terminal before the preset timer is overtime, the preset timer is closed. And if the preset timer is overtime and the terminal does not monitor the signaling of the downlink control channel scrambled by the C-RNTI of the terminal, executing preset operation. Wherein the preset operation comprises: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; triggering the RRC reestablishment procedure.
For example, the terminal performs a RACH-less handover procedure according to network configuration, fails to access the target cell during the validity period of the preconfigured uplink resource, resets a preset timer, i.e., resets T304, and monitors a physical downlink control channel of the target cell. Before the preset timer T304 is overtime, the terminal does not monitor the signaling of the downlink control channel scrambled by the C-RNTI of the terminal, and then the terminal triggers the NAS recovery process.
Mode 7: and the terminal starts a first timer and monitors a physical downlink control channel of the target cell.
And if the terminal monitors the signaling of the downlink control channel scrambled by the C-RNTI of the terminal before the first timer is overtime, indicating that the terminal is successfully accessed into the target cell, closing the first timer. The first timer duration is a preset value configured to the UE by the network through signaling or specified by a protocol.
For example, the terminal performs a RACH-less handover procedure according to network configuration, fails to access the target cell during the validity period of the preconfigured uplink resource, starts a first timer, and closes a preset timer, i.e., closes T304, and monitors a physical downlink control channel of the target cell. And the terminal monitors the signaling of the downlink control channel scrambled by the C-RNTI of the terminal before the first timer is overtime, and then the first timer is closed.
If the first timer is overtime, the terminal does not monitor the signaling of the downlink control channel scrambled by the C-RNTI of the terminal, which indicates that the terminal does not successfully access the target cell. At this time, the terminal performs a preset operation. Specifically, the preset operation includes one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; the RRC reestablishment procedure is triggered.
For example, the terminal performs a RACH-less handover procedure according to network configuration, unsuccessfully accesses the target cell during the validity period of the preconfigured uplink resource, turns off T304, turns on the first timer, and monitors the physical downlink control channel of the target cell. And if the first timer is overtime and the terminal does not monitor the signaling of the downlink control channel scrambled by the C-RNTI of the terminal, triggering the RRC reestablishment process.
Case three: and if the preset timer is overtime, the preconfigured uplink resources are effective.
In specific implementation, the terminal does not successfully access the target cell before the preset timer is overtime. At this time, the uplink resource preconfigured by the target cell for the terminal is still valid, and the terminal may perform processing according to any one of the modes 1 to 8:
mode 1: the terminal triggers an RRC reestablishment procedure.
In implementation, the terminal does not successfully access the target cell when accessing the target cell according to network configuration, and if the preset timer is overtime and the preconfigured uplink resource is valid, the terminal triggers an RRC reestablishment process, for example, the terminal performs an RACH-less handover process, T304 is overtime, the terminal does not successfully access the target cell, and the network side triggers an RRC reestablishment when the validity period of the preconfigured uplink resource for the terminal has not reached the end time of the valid window.
Mode 2: the terminal enters an idle state.
When the method is implemented, the terminal does not successfully access the target cell when accessing the target cell according to network configuration, if the preset timer is overtime and the pre-configured uplink resource is effective, the terminal enters an idle state, for example, the terminal executes an RACH-less switching process, T304 is overtime, the terminal does not successfully access the target cell, and the terminal enters the idle state when the validity period of the uplink resource pre-configured for the terminal on the network side does not reach the end time of the valid window yet.
Mode 3: the terminal triggers the NAS recovery procedure.
For example, the terminal does not successfully access the target cell when accessing the target cell according to the network configuration, if the preset timer is overtime, the preconfigured uplink resource is valid, the terminal triggers the NAS recovery process, for example, the terminal performs the RACH-less handover process, and the T304 is overtime, the terminal does not successfully access the target cell, and the validity period of the uplink resource preconfigured for the terminal by the network side has not reached the end time of the valid window, and the terminal triggers the NAS recovery process.
Mode 4: the terminal enters an idle state and triggers the NAS recovery process.
For example, the terminal does not successfully access the target cell when accessing the target cell according to the network configuration, if the preset timer is overtime, the preconfigured uplink resource is valid, and enters an idle state, and at the same time, triggers an NAS recovery process, for example, the terminal performs an RACH-less handover process, T304 is overtime, the terminal does not successfully access the target cell, and the network side enters the idle state and triggers the NAS recovery process when the validity period of the uplink resource preconfigured for the terminal has not reached the end time of the valid window yet.
Mode 5: and the terminal releases the uplink resource and triggers a random access process to access the target cell.
When the method is implemented, the terminal does not successfully access the target cell when the target cell is accessed according to network configuration, if the preset timer is overtime, the preconfigured uplink resources are effective, and the terminal needs to release the uplink resources. And triggering a random access process to access the target cell. For example, the terminal executes the RACH-less handover procedure, the T304 is overtime, the terminal does not successfully access the target cell, and the validity period of the uplink resource preconfigured for the terminal by the network side has not yet reached the end time of the valid window, the terminal releases the uplink resource, and triggers the random access procedure to access the target cell.
In implementation, if the target cell allocates the dedicated random access resource to the terminal, the terminal triggers a non-contention random access process, that is, sends a dedicated preamble sequence to the target cell, or on a beam selected to be accessed by the UE in a multi-beam scene, the network allocates the dedicated random access resource to the UE, and triggers the non-contention random access process on the beam, otherwise triggers the contention random access process. If the target cell does not allocate the dedicated random access resource 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. Or, the terminal may ignore the random access resource allocated by the target cell, and directly trigger the contention random access procedure.
If the terminal RRC receives the indication information of the random Access failure sent by the MAC (Media Access Control) layer, it indicates that the terminal has failed to Access the target cell randomly. At this time, the terminal needs to perform a preset operation. Specifically, the preset operation includes one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; the RRC reestablishment procedure is triggered.
For example, the target cell does not allocate random access resources to the terminal, the terminal triggers a contention random access procedure to access the target cell, and sends a randomly selected preamble sequence to the target cell. And when the terminal RRC receives the indication information of the random access failure sent by the MAC layer, the terminal triggers the RRC reestablishment process.
For another example, the target cell allocates a dedicated random access resource to the terminal, and the terminal triggers a non-contention random access process to access the target cell and sends a dedicated preamble sequence to the target cell. And the terminal RRC enters an idle state when receiving the indication information of the random access failure sent by the MAC layer.
Mode 6: the terminal releases the uplink resource and starts a second timer; and the terminal triggers a random access process to access the target cell.
When the method is implemented, the terminal does not successfully access the target cell when the target cell is accessed according to network configuration, if the preset timer is overtime, the preconfigured uplink resources are effective, and the terminal needs to release the uplink resources. And the terminal starts a second timer and triggers a random access process to access the target cell. The duration of the second timer is a preset value configured to the UE by the network through signaling or specified by a protocol.
Specifically, if the target cell allocates a dedicated random access resource to the terminal, a non-contention random access process is triggered, or a dedicated random access resource is allocated to the UE by the network on a beam selected to be accessed by the UE in a multi-beam scene, 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 for the terminal, a competing random access procedure is triggered. Or, the terminal may ignore whether the target cell allocates the random access resource, and only trigger the contention random access procedure.
And if the terminal completes the random access process before the second timer is overtime, closing the second timer.
For example, the target cell allocates a dedicated random access resource for the terminal. And the terminal executes the RACH-less switching process, the T304 is overtime, the terminal is not successfully accessed into the target cell, the second timer is started, and the non-competitive random access process is triggered to access into the target cell. And the terminal completes the random access process before the second timer is overtime, and then closes the second timer.
And if the second timer is overtime and the terminal does not access the target cell, the terminal executes preset operation. Wherein the preset operation is one of: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; triggering the RRC reestablishment procedure.
For example, the target cell does not allocate a dedicated random access resource for the terminal. And the terminal executes the RACH-less switching process, the T304 is overtime, the terminal does not successfully access the target cell, the second timer is started, and the competitive random access process is triggered to be counted into the target cell. And when the second timer is overtime, the terminal does not access the target cell and triggers the NAS recovery process.
Mode 7: and the terminal starts a first timer and monitors a physical downlink control channel of the target cell.
When the method is implemented, the terminal does not successfully access the target cell when the target cell is accessed according to network configuration, if the preset timer is overtime, the preconfigured uplink resources are effective, and the terminal needs to release the uplink resources. And the terminal starts a first timer and monitors a physical downlink control channel of the target cell. The first timer duration is a preset value configured to the UE by the network through signaling or specified by a protocol.
And if the terminal monitors the signaling of the downlink control channel scrambled by the C-RNTI of the terminal before the first timer is overtime, indicating that the terminal is successfully accessed into the target cell, closing the first timer.
For example, the terminal performs an RACH-less handover procedure, and when T304 times out, the terminal does not successfully access the target cell, starts a first timer, and monitors a physical downlink control channel of the target cell. And before the first timer is overtime, the terminal monitors the signaling of the downlink control channel scrambled by the C-RNTI of the terminal, and then the first timer is closed.
If the first timer is overtime, the signaling of the downlink control channel scrambled by the C-RNTI of the terminal is not monitored, and the terminal is not successfully accessed into the target cell. At this time, the terminal performs a preset operation. Specifically, the preset operation includes one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; triggering the RRC reestablishment procedure.
For example, the terminal performs the RACH-less handover procedure, and if T304 is time out, the terminal does not successfully access the target cell, starts the first timer, and monitors the physical downlink control channel of the target cell. And if the first timer is overtime and the terminal does not monitor the signaling of the downlink control channel scrambled by the C-RNTI of the terminal, triggering the RRC reestablishment process.
Mode 8: and the terminal sends uplink data in the uplink resource validity period.
In implementation, when the validity period of the uplink resource is over, the terminal performs one of the following operations: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; triggering an RRC reestablishment process;
for example, when the terminal performs the RACH-less handover procedure and T304 is time out and the uplink resource preconfigured by the terminal not successfully accessing the target cell is valid, the terminal transmits uplink data in the uplink resource within the validity period of the uplink resource. If the terminal receives the PDCCH message scrambled by the CRNTI of the terminal or receives a response that the uplink data is successfully sent, such as an ACK response message in a HARQ or ARQ process, the terminal is successfully accessed into the target cell, otherwise, after the uplink resource is invalid, if the terminal is not successfully accessed into the target cell, the terminal triggers an RRC reestablishment process.
The technical solutions provided in the present application are further described below by specific examples.
Example 1: RACH-less handover, triggering random access procedure
Step 1: and the source cell transparently transmits a switching command to the UE, wherein the switching command comprises uplink resources pre-configured for the UE by the target cell, and the pre-configured uplink resources are effective in a specified time.
Step 2: after receiving the handover command, the UE starts a timer T304, and initiates uplink transmission on an uplink resource preconfigured for the UE on the network side within a specified time to access to the target cell.
And step 3: within a specified time, the UE cannot successfully access the target cell, for example, T304 has not timed out without receiving a PDCCH command scrambled by the UE C-RNTI sent by the network side.
And 4, step 4: the UE triggers a random access procedure.
And 5: if the random access process is successful, the timer T304 is closed, otherwise, if the T034 is overtime, the terminal does not successfully access the target cell, and the preset operation is executed.
Wherein the preset operation comprises one of the following: triggering an RRC reestablishment process; entering an idle state; triggering an NAS recovery process; enter an idle state and trigger a NAS recovery procedure.
Optionally, step 4 may also be implemented as turning off a timer T304, turning on a second timer, and triggering a random access procedure by the UE. Step 5 may be executed to close the second timer if the UE successfully accesses the target cell before the second timer expires. Or, step 5 may also be executed to execute a preset operation if the second timer is overtime and the UE does not access the target cell. Wherein the preset operation comprises one of the following: triggering an RRC reestablishment process; entering an idle state; triggering an NAS recovery process; and entering an idle state and triggering the NAS recovery process.
Optionally, step 4 may also be performed to restart the timer T304, triggering the random access procedure. Step 5 may be performed to turn off T304 if the UE successfully accesses the target cell before T304 times out. Alternatively, step 5 may also be performed to perform a preset operation if T304 is overtime and the UE does not successfully access the target cell. Wherein the preset operation comprises one of the following: triggering an RRC reestablishment process; entering an idle state; triggering an NAS recovery process; enter an idle state and trigger a NAS recovery procedure.
Optionally, step 4 may also be performed to close the timer T304, triggering the random access procedure. Step 5 may be performed to perform a preset operation if the RRC receives the indication information of the random access failure sent by the MAC layer. Wherein the preset operation comprises one of the following: triggering an RRC reestablishment process; entering an idle state; triggering an NAS recovery process; enter an idle state and trigger a NAS recovery procedure.
Example 2: RACH-less switching, triggering the PDCCH monitoring the target cell
Step 1: and the source cell transparently transmits a switching command to the UE, wherein the switching command comprises uplink resources pre-configured for the UE by the target cell, and the pre-configured uplink resources are effective in a specified time.
Step 2: after receiving the handover command, the UE starts a timer T304, and initiates uplink transmission on an uplink resource preconfigured for the UE on the network side within a specified time to access to the target cell.
And step 3: within a specified time, the UE cannot successfully access the target cell, for example, T304 has not timed out without receiving a PDCCH command scrambled by the UE C-RNTI sent by the network side.
And 4, step 4: and monitoring the PDCCH of the target cell.
And 5: if a PDCCH order scrambled with the C-RNTI of the UE is monitored, T304 is turned off.
Optionally, step 5 may also be performed to perform a preset operation if T304 times out and a PDCCH order scrambled by the C-RNTI of the UE is not monitored. Wherein the preset operation comprises one of the following: triggering an RRC reestablishment process; entering an idle state; triggering an NAS recovery process; enter an idle state and trigger a NAS recovery procedure.
Optionally, step 4 may also be performed to close the timer T304, open the first timer, and monitor the PDCCH of the target cell. Step 5 may be performed to turn off the first timer if the PDCCH order scrambled with the C-RNTI of the UE is monitored. Alternatively, step 5 may also be performed to perform a preset operation if T304 times out and a PDCCH order scrambled by the C-RNTI of the UE is not monitored. Wherein the preset operation comprises one of the following: triggering an RRC reestablishment process; entering an idle state; triggering an NAS recovery process; enter an idle state and trigger a NAS recovery procedure.
Optionally, step 4 may also be executed to restart the timer T304, and monitor the PDCCH of the target cell. Step 5 may be performed to turn off T304 if a PDCCH order scrambled with the C-RNTI of the UE is heard. Alternatively, step 5 may also be performed to perform a preset operation if T304 times out and a PDCCH order scrambled by the C-RNTI of the UE is not monitored. Wherein the preset operation comprises one of the following: triggering an RRC reestablishment process; entering an idle state; triggering an NAS recovery process; enter an idle state and trigger a NAS recovery procedure.
Example 3: RACH-less switching, triggering RRC reestablishment process or NAS recovery process or entering idle state
Step 1: and the source cell transparently transmits a switching command to the UE, wherein the switching command comprises uplink resources pre-configured for the UE by the target cell, and the pre-configured uplink resources are effective in a specified time.
Step 2: after receiving the handover command, the UE starts a timer T304, and initiates uplink transmission on an uplink resource preconfigured for the UE on the network side within a specified time to access to the target cell.
And step 3: within a specified time, the UE cannot successfully access the target cell, for example, T304 has not timed out without receiving a PDCCH command scrambled by the UE C-RNTI sent by the network side.
And 4, step 4: and closing the T304 timer and executing preset operation.
Wherein the preset operation comprises one of the following: triggering an RRC reestablishment process; entering an idle state; triggering an NAS recovery process; and entering an idle state and triggering the NAS recovery process.
Example 4: RACH-less switching, triggering the PDCCH monitoring the target cell
Step 1: and the source cell transparently transmits a switching command to the UE, wherein the switching command comprises uplink resources pre-configured for the UE by the target cell, and the pre-configured uplink resources are effective in a specified time.
Step 2: after receiving the handover command, the UE starts a timer T304, and initiates uplink transmission on an uplink resource preconfigured for the UE on the network side within a specified time to access to the target cell.
And step 3: and when T304 is overtime, the UE cannot be successfully accessed into the target cell, and the preconfigured uplink resources are still valid.
And 4, step 4: and releasing uplink resources, starting a first timer, and monitoring the PDCCH of the target cell.
And 5: and if the PDCCH command scrambled by the C-RNTI of the UE is monitored, closing the first timer.
Optionally, step 5 may be further performed to perform a preset operation if the PDCCH order scrambled by the C-RNTI of the UE is not monitored after the first timer expires. Wherein the preset operation comprises one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; triggering the RRC reestablishment procedure.
Optionally, step 4 may also be executed to release the uplink resource and execute a preset operation. Wherein the preset operation comprises one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; the RRC reestablishment procedure is triggered.
Optionally, step 4 may also be executed to send the uplink command according to the configured uplink resource within the preset validity period of the uplink resource. Step 5 may be performed to perform access successfully for receiving PDCCH signaling scrambled with the C-RNTI of the UE or receiving a response message for successfully transmitting uplink data, e.g., an ACK response in a HARQ or ARQ process. Or, step 5 may also be performed to perform a preset operation if the PDCCH signaling scrambled by the C-RNTI of the UE is not received within the uplink resource validity time, and the access to the target cell is not successful. Wherein the preset operation comprises one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; triggering the RRC reestablishment procedure.
Optionally, step 4 may also be performed to start a second timer and trigger the random access process if the target cell is not accessed within the uplink resource valid time. Step 5 may be performed to close the second timer if the random access procedure is completed before the second timer expires, and the access is successful. Otherwise, step 5 may be further performed, if the second timer is overtime and the random access is not successful, performing a preset operation, where the preset operation includes one of the following operations: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; the RRC reestablishment procedure is triggered.
Optionally, step 4 may also be performed to trigger the random access procedure. Step 5 may be performed to perform a preset operation if the RRC receives the indication information of random access sent by the MAC layer. Wherein the preset operation comprises one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; the RRC reestablishment procedure is triggered.
Example 5: t304 is not started, and triggers the PDCCH for monitoring the target cell
Step 1: and the source cell transparently transmits a switching command to the UE, wherein the switching command comprises uplink resources pre-configured for the UE by the target cell, and the pre-configured uplink resources are effective in a specified time.
Step 2: after receiving the switching command, the UE ignores the timer T304, and initiates uplink transmission on an uplink resource preconfigured for the UE on the network side within a specified time to access to the target cell.
And 3, step 3: and within the specified effective time, the UE cannot successfully access the target cell, for example, a PDCCH command scrambled by the C-RNTI of the UE and sent by the network side is not received.
And 4, step 4: and starting a first timer and monitoring the PDCCH of the target cell.
And 5: and if the PDCCH command scrambled by the C-RNTI of the UE is monitored before the first timer is overtime, closing the first timer.
Optionally, step 5 may also be performed to perform a preset operation if the first timer expires and the PDCCH command scrambled by the C-RNTI of the UE is not monitored. Wherein the preset operation comprises one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; triggering the RRC reestablishment procedure.
Optionally, step 4 may also be performed as triggering the random access procedure. Step 5 may be performed to perform a preset operation if the RRC receives the indication information of random access sent by the MAC layer. Wherein the preset operation comprises one of the following: entering an idle state; triggering an NAS recovery process; entering an idle state and triggering an NAS recovery process; the RRC reestablishment procedure is triggered.
Optionally, step 4 may also be performed to start a second timer, and the UE triggers the random access procedure. Step 5 may be executed to close the second timer if the UE successfully accesses the target cell before the second timer expires. Or, step 5 may also be executed to execute a preset operation if the second timer is overtime and the UE does not access the target cell. Wherein the preset operation comprises one of the following: triggering an RRC reestablishment process; entering an idle state; triggering an NAS recovery process; enter an idle state and trigger a NAS recovery procedure.
Optionally, step 4 may also be performed to trigger the RRC reestablishment procedure. Or, entering an idle state; triggering an NAS recovery process; and entering an idle state and triggering the NAS recovery process.
Based on the same inventive concept, the embodiment of the application also provides 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 that of the method, the implementation of the terminal may refer to the implementation of the method, and repeated details are not repeated.
As shown in fig. 3, a terminal according to an embodiment of the present application includes:
a processor 3100, a memory 3101, and a transceiver 3102.
The processor 3100 is responsible for managing the bus architecture and general processing, and the memory 3101 may store data used by the processor 3100 in performing operations. The transceiver 3102 is used to receive and transmit data under the control of the processor 3100.
The bus architecture may include any number of interconnected buses and bridges, with one or more of the processor 3100, represented by processor 3100, and the various circuits of the memory represented by memory 3101 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 3100 is responsible for managing the bus architecture and general processing, and the memory 3101 may store data used by the processor 3100 in performing operations.
The processes disclosed by the embodiments of the present invention may be applied to the processor 3100, or may be implemented by the processor 3100. In implementation, the steps of the signal processing flow may be accomplished by instructions in the form of hardware, integrated logic circuits, or software in processor 3100. 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, discrete gate or transistor logic, discrete hardware components, or the like that can implement or perform the methods, steps, and logic blocks disclosed in embodiments of the invention. General processor 3100 may be a microprocessor 3100 or any conventional processor 3100, or the like. The steps of the disclosed methods in connection with the embodiments of the invention may be embodied directly in the hardware processor 3100, or in a combination of hardware and software modules within the processor 3100. The software modules may be located in ram, flash, rom, prom, or eprom, registers, etc. as is well known in the art. The storage medium is located in the memory 3101, and the processor 3100 reads information in the memory 3101, and completes the steps of the signal processing flow in conjunction with hardware thereof.
The processor 3100 is configured to read the program in the memory 3101 and execute the following processes:
accessing a target cell according to network configuration;
and after the target cell is not successfully accessed, processing according to the state of the preset timer and/or the effective state of the preconfigured uplink resource.
Optionally, the valid state of the preconfigured uplink resource is invalid;
the processor 3100 is specifically configured to:
triggering a Radio Resource Control (RRC) reconstruction process; or the like, or, alternatively,
entering an idle state; or the like, or, alternatively,
triggering a non-access stratum (NAS) recovery process; or the like, or, alternatively,
entering an idle state and triggering an NAS recovery process; or the like, or, alternatively,
triggering a random access process to access the target cell; or the like, or, alternatively,
starting a first timer and monitoring a physical downlink control channel of the target cell; or the like, or a combination thereof,
and starting a second timer and triggering a random access process to access the target cell.
Optionally, the state of the preset timer is not overtime, and the valid state of the preconfigured uplink resource is invalid;
the processor 3100 is specifically configured to:
triggering a random access process to access a target cell; or the like, or, alternatively,
closing the preset timer and triggering a random access process to access the target cell; or the like, or, alternatively,
resetting the preset timer and triggering a random access process to access the target cell; or the like, or, alternatively,
starting a second timer and triggering a random access process to access the target cell; or the like, or a combination thereof,
monitoring a physical downlink control channel of the target cell; or the like, or a combination thereof,
resetting the preset timer and monitoring a physical downlink control channel of the target cell; or the like, or a combination thereof,
and starting a first timer and monitoring a physical downlink control channel of the target cell.
Optionally, if the state of the preset timer is overtime, the valid state of the preconfigured uplink resource is valid;
the processor 3100 is specifically configured to:
triggering an RRC reestablishment process; or the like, or, alternatively,
entering an idle state; or the like, or, alternatively,
triggering an NAS recovery process; or the like, or a combination thereof,
entering an idle state and triggering an NAS recovery process; or the like, or a combination thereof,
releasing the uplink resource and triggering a random access process to access the target cell; or the like, or a combination thereof,
releasing the uplink resource and starting a second timer; the terminal triggers a random access process to access the target cell; or the like, or, alternatively,
starting a first timer, and monitoring a physical downlink control channel of the target cell; or the like, or, alternatively,
and sending uplink data in the uplink resource in the validity period of the uplink resource.
Optionally, the processor 3100 is further configured to:
starting a first timer, after monitoring a physical downlink control channel of the target cell, if a signaling of the downlink control channel scrambled by a temporary identifier of the terminal is monitored before the first timer is overtime, closing the first timer; or the like, or a combination thereof,
if the first timer is overtime and the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is not monitored, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
Optionally, the processor 3100 is further configured to:
starting a second timer, triggering a random access process to access the target cell, and closing the second timer if the random access process is completed before the second timer is overtime; or the like, or, alternatively,
if the second timer is overtime and the target cell is not accessed, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
Optionally, the processor 3100 is further configured to:
after a random access process is triggered to access the target cell, if the MAC layer of the terminal indicates that the random access fails, executing a preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
Optionally, the processor 3100 is further configured to:
after a random access process is triggered to access the target cell, if the random access process is completed before the preset timer is overtime, the preset timer is closed; or the like, or, alternatively,
if the preset timer is overtime and the target cell is not accessed, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
the RRC reestablishment procedure is triggered.
Optionally, the processor 3100 is further configured to:
after monitoring the physical downlink control channel of the target cell, if the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is monitored before the preset timer is overtime, closing the preset timer; or the like, or a combination thereof,
if the preset timer is overtime and the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is not monitored, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
Optionally, the processor 3100 is further configured to:
after the uplink resource sends uplink data in the validity period of the uplink resource, if a signaling of a downlink control channel scrambled by a temporary identifier of the terminal is monitored or a response message of successfully sending the uplink data is received in the validity period of the uplink resource, releasing the uplink resource;
if the period of validity of the uplink resource is over, the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is not monitored or a response message of successfully sending the uplink data is not received, and then a preset operation is executed;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering the NAS layer recovery process;
triggering the RRC reestablishment procedure.
Based on the same inventive concept, the embodiment of the present invention further provides a device for processing after cell access failure, and as the device is the device in the method in the embodiment of the present invention, and the principle of the device for solving the problem is similar to that of the method, the implementation of the device may refer to the implementation of the method, and repeated details are omitted.
As shown in fig. 4, an embodiment of the present application further provides a device for processing after a cell access failure, where the device includes:
an access module 401 and a processing module 402.
The access module 401 is configured to perform target cell access according to network configuration;
a processing module 402, configured to perform processing according to a state of a preset timer and/or an effective state of a preconfigured uplink resource after the target cell is not successfully accessed.
In a possible implementation manner, the valid state of the preconfigured uplink resource is invalid;
the processing module 402 is specifically configured to:
triggering a Radio Resource Control (RRC) reestablishment process; or the like, or, alternatively,
entering an idle state; or the like, or a combination thereof,
triggering a non-access stratum (NAS) recovery process; or the like, or, alternatively,
entering an idle state and triggering an NAS recovery process; or the like, or, alternatively,
triggering a random access process to access the target cell; or the like, or, alternatively,
starting a first timer and monitoring a physical downlink control channel of the target cell; or the like, or a combination thereof,
and starting a second timer and triggering a random access process to access the target cell.
In a possible implementation manner, the state of the preset timer is not overtime, and the valid state of the preconfigured uplink resource is invalid;
the processing module 402 is specifically configured to:
triggering a random access process to access a target cell; or the like, or a combination thereof,
closing the preset timer and triggering a random access process to access the target cell; or the like, or, alternatively,
resetting the preset timer and triggering a random access process to access the target cell; or the like, or a combination thereof,
starting a second timer and triggering a random access process to access the target cell; or the like, or a combination thereof,
monitoring a physical downlink control channel of the target cell; or the like, or, alternatively,
resetting the preset timer and monitoring a physical downlink control channel of the target cell; or the like, or a combination thereof,
and starting a first timer and monitoring a physical downlink control channel of the target cell.
In a possible implementation manner, if the state of the preset timer is overtime, the valid state of the preconfigured uplink resource is valid;
the processing module 402 is specifically configured to:
triggering an RRC reestablishment process; or the like, or, alternatively,
entering an idle state; or the like, or, alternatively,
triggering an NAS recovery process; or the like, or, alternatively,
entering an idle state and triggering an NAS recovery process; or the like, or a combination thereof,
releasing the uplink resource and triggering a random access process to access the target cell; or the like, or, alternatively,
releasing the uplink resource and starting a second timer; the terminal triggers a random access process to access the target cell; or the like, or, alternatively,
starting a first timer and monitoring a physical downlink control channel of the target cell; or the like, or a combination thereof,
and sending uplink data in the uplink resource in the validity period of the uplink resource.
In a possible implementation manner, the processing module 402 is further configured to:
starting a first timer, after monitoring a physical downlink control channel of the target cell, if a signaling of the downlink control channel scrambled by a temporary identifier of the terminal is monitored before the first timer is overtime, closing the first timer; or the like, or, alternatively,
if the first timer is overtime and the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is not monitored, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
the RRC reestablishment procedure is triggered.
In a possible implementation manner, the processing module 402 is further configured to:
starting a second timer, triggering a random access process to access the target cell, and closing the second timer if the random access process is completed before the second timer is overtime; or the like, or, alternatively,
if the second timer is overtime and the target cell is not accessed, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
the RRC reestablishment procedure is triggered.
In a possible implementation manner, the processing module 402 is further configured to:
after a random access process is triggered to access the target cell, if the MAC layer of the terminal indicates that the random access fails, executing a preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
In a possible implementation manner, the processing module 402 is further configured to:
after a random access process is triggered to access the target cell, if the random access process is completed before the preset timer is overtime, the preset timer is closed; or the like, or, alternatively,
if the preset timer is overtime and the target cell is not accessed, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
the RRC reestablishment procedure is triggered.
In a possible implementation manner, the processing module 402 is further configured to:
after monitoring the physical downlink control channel of the target cell, if the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is monitored before the preset timer is overtime, closing the preset timer; or the like, or, alternatively,
if the preset timer is overtime and the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is not monitored, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
In a possible implementation manner, the processing module 402 is further configured to:
after the uplink resource sends uplink data in the validity period of the uplink resource, if the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is monitored or a response message for successfully sending the uplink data is received in the validity period of the uplink resource, the uplink resource is released;
if the period of validity of the uplink resource is over, the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is not monitored or a response message of successfully sending the uplink data is not received, and then a preset operation is executed;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering the NAS layer recovery process;
triggering the RRC reestablishment procedure.
The embodiment of the present invention further provides a computer-readable non-volatile storage medium, which includes a program code, and when the program code runs on a computing terminal, the program code is configured to enable the computing terminal to execute the steps of the method for reporting channel state information according to the embodiment of the present invention.
The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.
Accordingly, the present application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (20)

1. A method for processing after a cell access failure, the method comprising:
the terminal accesses a target cell according to network configuration;
after the terminal is unsuccessfully accessed to the target cell, processing according to the state of the preset timer and the effective state of the preconfigured uplink resource; the preconfigured uplink resource is allocated to the terminal for the target cell;
when the state of the preset timer is not overtime and the valid state of the preconfigured uplink resource is invalid, the terminal performs processing according to the state of the preset timer and the valid state of the preconfigured uplink resource, including:
the terminal triggers a random access process to access a target cell; or the like, or, alternatively,
the terminal closes the preset timer and triggers a random access process to access the target cell; or the like, or, alternatively,
the terminal resets the preset timer and triggers a random access process to access the target cell; or the like, or, alternatively,
and the terminal starts a second timer and triggers a random access process to access the target cell.
2. The method according to claim 1, wherein the status of the preset timer is not expired, and the valid status of the preconfigured uplink resource is invalid;
the terminal processes according to the state of the preset timer and the effective state of the pre-configured uplink resource, and further comprises:
the terminal monitors a physical downlink control channel of the target cell; or the like, or, alternatively,
the terminal resets the preset timer and monitors a physical downlink control channel of the target cell; or the like, or, alternatively,
and the terminal starts a first timer and monitors a physical downlink control channel of the target cell.
3. The method according to claim 1, wherein if the status of the preset timer is timeout, the valid status of the preconfigured uplink resource is valid;
processing according to the state of the preset timer and the effective state of the preconfigured uplink resource, comprising:
the terminal triggers an RRC reestablishment process; or the like, or a combination thereof,
the terminal enters an idle state; or the like, or, alternatively,
the terminal triggers an NAS recovery process; or the like, or a combination thereof,
the terminal enters an idle state and triggers an NAS recovery process; or the like, or a combination thereof,
the terminal releases the uplink resource and triggers a random access process to access the target cell; or the like, or, alternatively,
the terminal releases the uplink resource and starts a second timer; the terminal triggers a random access process to access the target cell; or the like, or a combination thereof,
the terminal starts a first timer and monitors a physical downlink control channel of the target cell; or the like, or a combination thereof,
and the terminal sends uplink data in the uplink resource in the validity period of the uplink resource.
4. The method according to claim 2 or 3, wherein the terminal starts a first timer, and after monitoring the physical downlink control channel of the target cell, the method further comprises:
if the terminal monitors the signaling of the downlink control channel scrambled by the temporary identifier of the terminal before the first timer is overtime, the terminal closes the first timer; or the like, or a combination thereof,
if the first timer is overtime and the terminal does not monitor the signaling of the downlink control channel scrambled by the temporary identifier of the terminal, the terminal executes preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
the RRC reestablishment procedure is triggered.
5. The method as claimed in claim 1 or 3, wherein after the terminal starts the second timer and triggers the random access procedure to access the target cell, the method further comprises:
if the terminal completes the random access process before the second timer is overtime, the terminal closes the second timer; or the like, or, alternatively,
if the second timer is overtime and the terminal is not accessed to the target cell, the terminal executes preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
the RRC reestablishment procedure is triggered.
6. The method according to claim 1 or 3, wherein after the terminal triggers a random access procedure to access the target cell, the method further comprises:
if the MAC layer of the terminal indicates that the random access fails, the terminal executes preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
the RRC reestablishment procedure is triggered.
7. The method of claim 1, wherein after the terminal triggers a random access procedure to access the target cell, the method further comprises:
if the terminal completes the random access process before the preset timer is overtime, the terminal closes the preset timer; or the like, or a combination thereof,
if the preset timer is overtime and the terminal is not accessed to the target cell, the terminal executes preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
the RRC reestablishment procedure is triggered.
8. The method of claim 1, wherein after the terminal monitors a physical downlink control channel of the target cell, the method further comprises:
if the terminal monitors a signaling of a downlink control channel scrambled by a temporary identifier of the terminal before the preset timer is overtime, the terminal closes the preset timer; or the like, or, alternatively,
if the preset timer is overtime and the terminal does not monitor the signaling of the downlink control channel scrambled by the temporary identifier of the terminal, the terminal executes preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
9. The method of claim 3, wherein after the terminal transmits uplink data in the uplink resource within the validity period of the uplink resource, the method further comprises:
if the terminal monitors the signaling of the downlink control channel scrambled by the temporary identifier of the terminal or receives a response message of successfully sending uplink data in the period that the uplink resource is effective, the terminal releases the uplink resource;
if the validity period of the uplink resource is over, the terminal does not monitor the signaling of the downlink control channel scrambled by the temporary identifier of the terminal or receives a response message of successfully sending the uplink data, and then the terminal executes preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS layer recovery process;
the RRC reestablishment procedure is triggered.
10. A terminal, characterized in that the terminal comprises: a processor and a memory;
the processor is used for reading the program in the memory and executing the following processes:
accessing a target cell according to network configuration;
after the target cell is not successfully accessed, processing according to the state of a preset timer and the effective state of the preconfigured uplink resource; the preconfigured uplink resource is allocated to the terminal for the target cell;
wherein, when the preset timer is not timed out and the pre-configured uplink resource is invalid in valid status, the processor is specifically configured to:
triggering a random access process to access a target cell; or, closing the preset timer and triggering a random access process to access the target cell; or, resetting the preset timer and triggering a random access process to access the target cell; or, starting a second timer and triggering a random access process to access the target cell.
11. The terminal according to claim 10, wherein the preset timer is not timed out, and the preconfigured uplink resource is invalid;
the processor is further configured to:
monitoring a physical downlink control channel of the target cell; or, resetting the preset timer and monitoring the physical downlink control channel of the target cell; or, starting a first timer and monitoring a physical downlink control channel of the target cell.
12. The terminal according to claim 10, wherein if the status of the preset timer is timeout, the valid status of the preconfigured uplink resource is valid;
the processor is specifically configured to:
triggering an RRC reestablishment process; or the like, or, alternatively,
entering an idle state; or the like, or, alternatively,
triggering an NAS recovery process; or the like, or a combination thereof,
entering an idle state and triggering an NAS recovery process; or the like, or, alternatively,
releasing the uplink resource and triggering a random access process to access the target cell; or the like, or, alternatively,
releasing the uplink resource and starting a second timer; triggering a random access process to access the target cell; or the like, or, alternatively,
starting a first timer and monitoring a physical downlink control channel of the target cell; or the like, or a combination thereof,
and sending uplink data in the uplink resource in the validity period of the uplink resource.
13. The terminal of claim 11 or 12, wherein the processor is further configured to:
starting a first timer, after monitoring a physical downlink control channel of the target cell, if a signaling of the downlink control channel scrambled by a temporary identifier of the terminal is monitored before the first timer is overtime, closing the first timer; or the like, or, alternatively,
if the first timer is overtime and the terminal does not monitor the signaling of the downlink control channel scrambled by the temporary identifier of the terminal, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
14. The terminal of claim 10 or 12, wherein the processor is further configured to:
starting a second timer, triggering a random access process to access the target cell, and closing the second timer if the random access process is completed before the second timer is overtime; or the like, or, alternatively,
if the second timer is overtime and the terminal is not accessed to the target cell, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
the RRC reestablishment procedure is triggered.
15. The terminal according to claim 10 or 12, wherein the processor is further configured to:
after a random access process is triggered to access the target cell, if the MAC layer of the terminal indicates that the random access fails, executing a preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
the RRC reestablishment procedure is triggered.
16. The terminal of claim 10, wherein the processor is further configured to:
after a random access process is triggered to access the target cell, if the random access process is completed before the preset timer is overtime, the preset timer is closed; or the like, or, alternatively,
if the preset timer is overtime and the terminal is not accessed to the target cell, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
triggering the RRC reestablishment procedure.
17. The terminal of claim 10, wherein the processor is further configured to:
after monitoring the physical downlink control channel of the target cell, if the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is monitored before the preset timer is overtime, closing the preset timer; or the like, or, alternatively,
if the preset timer is overtime and the terminal does not monitor the signaling of the downlink control channel scrambled by the temporary identifier of the terminal, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering an NAS recovery process;
the RRC reestablishment procedure is triggered.
18. The terminal of claim 12, wherein the processor is further configured to:
after the uplink resource sends uplink data in the validity period of the uplink resource, if a signaling of a downlink control channel scrambled by a temporary identifier of the terminal is monitored or a response message of successfully sending the uplink data is received in the validity period of the uplink resource, releasing the uplink resource;
if the uplink resource validity period is over, and the signaling of the downlink control channel scrambled by the temporary identifier of the terminal is not monitored or the response message of successfully sending the uplink data is not received, executing preset operation;
wherein the preset operation comprises one of:
entering an idle state;
triggering an NAS recovery process;
entering an idle state and triggering the NAS layer recovery process;
triggering the RRC reestablishment procedure.
19. An apparatus for processing after cell access failure, the apparatus comprising:
the access module is used for accessing the target cell according to the network configuration;
the processing module is used for processing according to the state of a preset timer and the effective state of the preconfigured uplink resource after the target cell is not successfully accessed; the pre-configured uplink resource is allocated to a terminal by the target cell;
wherein, when the state of the preset timer is not overtime and the valid state of the preconfigured uplink resource is invalid, the processing module is specifically configured to:
triggering a random access process to access a target cell; or, closing the preset timer and triggering a random access process to access the target cell; or, resetting the preset timer and triggering a random access process to access the target cell; or starting a second timer and triggering a random access process to access the target cell.
20. A computer storage medium on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the steps of the method according to any one of claims 1 to 9.
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