RU2699244C1 - Method and device for radio communication line failure processing - Google Patents

Abstract

FIELD: radio engineering and communications.

SUBSTANCE: invention relates to radio communications. Method for processing a radio link failure involves the user equipment detecting whether a failure occurs on a radio link established between the user equipment and the second network device, and sending user equipment of first message to first network device when it is detected that failure occurs on radio communication line established between user equipment and second network device, wherein the first message is used to indicate that failure occurs on the radio link established between the user equipment and the second network device, and contains a link failure reason.

EFFECT: elimination of failure with minimum costs.

39 cl, 16 dwg

Description

FIELD OF TECHNOLOGY

[0001] The present invention relates to the field of wireless communications, and in particular, to a method and apparatus for processing a radio link failure.

BACKGROUND

[0002] With the development of communication technologies, the type of network deployment in the next generation wireless networks has gradually been introduced. As shown in FIG. 1, this type of network deployment includes two types of base stations, namely, the main base station 110 and the slave base station 120. User Equipment (UE) can simultaneously establish radio links with one main base station and one or more slave base stations. For example, the UE may simultaneously establish radio links with several cells of the main base station and simultaneously establish radio links with several cells of each slave base station. Several hundred of the main base station that establish radio links with the UE belong to the group of master cells (Master Cell Group, MCG), and several hundred of each slave base station that establish the radio links with UE belong to one group of sub cells (Secondary Cell Group, SCG). That is, the UE can simultaneously establish radio links with one MCG and several SCGs.

[0003] Currently, in detecting a radio link failure, the UE uses the one shown in FIG. 2 recovery process to eliminate the failure of the radio link. As shown in FIG. 2, the recovery process includes:

[0004] S210: The UE sends a recovery request message to the main base station.

[0005] S220: The main base station sends a recovery message to the UE, the message may include a Signaling Radio Bearer (SRB) configuration and counting of the Next Hop Chaining Count (NCC) so that The UE restores the SRB in accordance with the SRB-related configuration and generates a new security key in accordance with the NCC.

[0006] S220: The UE sends the recovery completion message to the main base station, the message being sent using the restored SRB and a new security key.

[0007] In the above process, the SRB between the UE and the main base station is restored, and security between the UE and the main base station is reactivated. However, when a failure occurs on the radio link between the UE and the slave base station, but no failure occurs on the radio link between the UE and the main base station, restoring the SRB and reactivating security between the UE and the main base station actually prolongs the user data outage caused by the failure radio communication lines, which impairs user interaction for the user. You can see that the existing method for handling a radio link failure is inefficient and useless to improve user experience.

SUMMARY OF THE INVENTION

[0008] Embodiments of the present invention provide a method and apparatus for processing a radio link failure to provide an effective solution when a radio link failure occurs between the UE and the slave base station. Technical solutions are as follows:

[0009] In accordance with a first aspect, a method for processing a radio link failure is provided, the method including:

detection by the user equipment whether a failure occurs on a radio link established between the user equipment and the second network device; and

the user equipment sending a first message to the first network device when it is detected that a failure occurs on a radio link established between the user equipment and the second network device, the first message being used to indicate that a failure occurs on a radio link established between the user equipment and the second network device .

[0010] With reference to the first aspect in a first possible implementation of the first aspect, the detection by the user equipment of whether a failure occurs on a radio link established between the user equipment and the second network device includes:

determining that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of the random access request by the user equipment on the first radio link reaches or exceeds the maximum number of retransmissions of the random access preamble, the first radio link being any radio link established between the user equipment and the second network device; or

determining that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that the timer corresponding to the first cell reaches or exceeds the timer duration, the first cell being any one hundredth of the second network device; or

determining that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of the uplink data for controlling the RLC radio by the user equipment on the first unidirectional radio channel reaches or exceeds the maximum number of retransmissions of the uplink data RLC, wherein the first unidirectional radio channel is any unidirectional radio channel through which the second network your device serves the user equipment and is carried over one or more radio links established between the user equipment and the second network device.

[0011] With reference to a first possible implementation type of the first aspect in a second possible implementation form of the first aspect, before the user equipment detects whether a failure occurs on a radio link established between the user equipment and the second network device, the method further includes:

receiving a configuration parameter, wherein the configuration parameter includes one or more of the following parameters:

the maximum number of retransmissions of the random access preamble, the duration of the timer, and the maximum number of retransmissions of RLC uplink data, the configuration parameter being received by the first network device from the second network device and sent to the user equipment, or the configuration parameter sent by the second network device to the user equipment.

[0012] With reference to the first aspect, the first possible implementation type of the first aspect or the second possible implementation type of the first aspect in the third possible implementation type of the first aspect, the first message carries an identifier associated with a communication failure, and the identifier associated with a communication failure includes one or several of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

[0013] With reference to the first aspect, the first possible implementation type of the first aspect, the second possible implementation type of the first aspect, or the third possible implementation type of the first aspect in the fourth possible implementation type of the first aspect, the first message carries the cause of the communication line failure.

[0014] With reference to the fourth possible implementation type of the first aspect in the fifth possible implementation form of the first aspect, the cause of the link failure includes: a random access problem, a number of retransmissions of a random access preamble reaching or exceeding a maximum number of retransmissions of a random access preamble, number RLC uplink data retransmissions reaching or exceeding the maximum number of RLC uplink data retransmissions, ending Timer or failure reconfiguration.

[0015] With reference to the first aspect, the first possible implementation type of the first aspect, the second possible implementation type of the first aspect, the third possible implementation type of the first aspect, the fourth possible implementation of the first aspect or the fifth possible implementation type of the first aspect, in the sixth possible implementation form of the first aspect after the user equipment sending the first message to the first network device, the method further includes:

receiving a command message sent by the first network device, the command message being used to instruct the user equipment to release the cell, the SCG slave cell group, the TAG timing advance group, or the unidirectional channel; and

release of a cell, SCG, TAG or unidirectional channel in accordance with a command message.

[0016] With reference to a sixth possible implementation form of the first aspect in a seventh possible implementation form of the first aspect, the release of a cell, SCG, TAG or unidirectional channel in accordance with a command message includes:

releasing the SCG corresponding to the second network device when the command message does not carry the release identifier; or

release a cell, SCG, TAG, or unidirectional channel according to the release identifier when the command message carries the release identifier.

[0017] With reference to a seventh possible implementation form of the first aspect in an eighth possible implementation form of the first aspect, the release of a cell, SCG, TAG or unidirectional channel in accordance with the release identifier includes:

cell release when the release identifier is a cell identifier and the cell is a sub cell in the SCG;

releasing the SCG when the release identifier is the cell identifier and the cell is the main cell in the SCG, or when the release identifier is the SCG identifier, or when the release identifier is the identifiers of all cells included in the SCG;

TAG release when the release identifier is a TAG identifier;

cell release, which is in the TAG and controlled by the second network device, when the release identifier is the cell identifier in the TAG; or

the release of the bearer channel served by the SCG when the release identifier is the identifier of the bearer channel served by the SCG.

[0018] In accordance with a second aspect, a method for processing a radio link failure is provided, wherein the method includes:

detecting by the second network device whether a failure occurs on the radio link established between the user equipment and the second network device; and

the second network device forwarding the first message to the first network device when it is detected that a failure occurs on a radio link established between the user equipment and the second network device, the first message being used to indicate that a failure occurs on a radio link established between the user equipment and the second network device device.

[0019] With reference to the second aspect in a first possible implementation of the second aspect, the detection by the second network device whether a failure occurs on a radio link established between the user equipment and the second network device, includes:

determining that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that the number of attempts to receive the random access request sent by the user equipment by the second network device on the first radio link reaches or exceeds the maximum number of attempts to receive the random access request wherein the first radio link is any radio link established between the user equipment and the WTO th network device; or

determining that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that sending information of the physical downlink control channel PDCCH to the second network device to the user equipment on the first radio link reaches or exceeds the maximum number of PDCCH retransmissions, wherein the first radio link is any radio link established between the user equipment and the second network device Twomey; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of the downlink data for controlling the RLC of the second network device over the first unidirectional radio channel reaches or exceeds the maximum number of retransmissions of the downlink data RLC communication, the first unidirectional radio channel being any unidirectional radio channel through which the second network the building serves user equipment and which is carried over one or more radio links established between the user equipment and the second network device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the frequency of blocks with errors in the uplink data sent by the user equipment and received on the first radio link by the second network device is greater than or equal to previously the set frequency of the blocks with errors, the first radio link being any radio link established between the user equipment and T another network device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the frequency of erroneous bits in the uplink data sent by the user equipment and received on the first radio link by the second network device is greater than or equal to previously the established frequency of occurrence of erroneous discharges, the first radio link being any radio link established between the user skim equipment and a second network device.

[0020] With reference to the first possible implementation type of the second aspect in the second possible implementation form of the second aspect, before the second network device detects whether a failure occurs on the radio link established between the user equipment and the second network device, the method further includes:

receiving a configuration parameter sent by the first network device, wherein the configuration parameter includes one or more of the following parameters:

the maximum number of attempts to receive a random access request, the maximum number of retransmissions of a PDCCH, the maximum number of retransmissions of RLC downlink data, a preset frequency of error blocks and a preset frequency of occurrence of erroneous bits.

[0021] With reference to the second aspect, the first possible implementation type of the second aspect or the second possible implementation type of the second aspect, in the third possible implementation type of the second aspect, the first message carries the user equipment identifier and the identifier associated with the communication failure, and the identifier associated with the communication failure includes one or more of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

[0022] With reference to the second aspect, the first possible implementation type of the second aspect, the second possible implementation type of the second aspect, or the third possible implementation type of the second aspect in the fourth possible implementation type of the second aspect, the first message carries the cause of the communication line failure.

[0023] With reference to the fourth possible implementation type of the second aspect in the fifth possible implementation form of the second aspect, the cause of the link failure includes: a random access problem, the number of times a random access request is received, reaching or exceeding the maximum number of attempts to receive a random access request, number retransmissions of a PDCCH reaching or exceeding the maximum number of retransmissions of a PDCCH, the number of retransmissions of RLC downlink data reaching or exceeding Higher maximum number of retransmissions of RLC downlink data, block frequency with errors in uplink data, reaching or exceeding a pre-set block frequency with errors, error rate for upstream data reaching or exceeding a preset frequency of occurrence of bit errors , an uplink reception problem or a downlink sending problem.

[0024] With reference to the second aspect, the first possible implementation type of the second aspect, the second possible implementation type of the second aspect, the third possible implementation type of the second aspect, the fourth possible implementation type of the second aspect or the fifth possible implementation type of the second aspect, in the sixth possible implementation form of the second aspect after the second network device sends the first message to the first network device, the method further includes:

receiving a command message sent by the first network device, the command message being used to instruct the second network device to release a resource used to service user equipment; and

releasing a resource used to service user equipment in accordance with a command message.

[0025] With reference to a sixth possible implementation form of the second aspect, in a seventh possible implementation form of the second aspect, releasing a resource used to service user equipment in accordance with a command message includes:

releasing a resource used to service user equipment when the command message includes an identifier of the user equipment; or

releasing a cell resource used for servicing user equipment when the command message includes a user equipment identifier and a cell identifier; or

releasing the TAG resource used to service the user equipment when the command message includes a user equipment identifier and a TAG identifier; or

releasing a cell resource included in the TAG and managed by a second network device used to service the user equipment when the command message includes a user equipment identifier and a cell identifier in the TAG; or

releasing the resource used to service the unidirectional channel of the user equipment when the command message includes the identifier of the user equipment and the identifier of the unidirectional channel.

[0026] In accordance with a third aspect, a method for processing a radio link failure is provided, the method including:

receiving a first message by the first network device, the first message being sent to the first network device by the user equipment or the second network device when a failure occurs on a radio link established between the user equipment and the second network device; and

determining by the first network device in accordance with the first message that a failure occurs on a radio link established between the user equipment and the second network device.

[0027] With reference to the third aspect in a first possible implementation of the third aspect, the first message carries an identifier associated with a communication failure, and the identifier associated with a communication failure includes one or more of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

[0028] With reference to the first possible implementation type of the third aspect, in the second possible implementation type of the third aspect, the first message further carries the user equipment identifier.

[0029] With reference to the third aspect, the first possible implementation type of the third aspect or the second possible implementation type of the third aspect in the third possible implementation type of the third aspect, the first message carries the cause of the communication line failure.

[0030] With reference to a third possible implementation type of the third aspect, in a fourth possible implementation type of the third aspect, the cause of the link failure includes: a random access problem, the number of retransmissions of the random access preamble reaching or exceeding the maximum number of retransmissions of the uplink RLC data , the number of retransmissions of RLC uplink data reaching or exceeding the maximum number of retransmissions of RLC uplink data, ending timer setting, reconfiguration failure, the number of times a random access request is received, reaching or exceeding the maximum number of attempts to receive a random access request, the number of PDCCH retransmissions, reaching or exceeding the maximum number of PDCCH retransmissions, the number of RLC downlink data retransmissions, reaching or exceeding the maximum number of retransmissions of RLC downlink data, the uplink data block error rate reaching or n upwardly predefined frequency of errored blocks, the frequency of occurrence of erroneous bits in the uplink data, reaching or exceeding the predefined frequency of erroneous discharges, the problem of reception on the uplink or the problem of sending on the downlink.

[0031] With reference to the third aspect, the first possible implementation type of the third aspect, the second possible implementation type of the third aspect, the third possible implementation type of the third aspect, or the fourth possible implementation type of the third aspect in the fifth possible implementation type of the third aspect after being determined by the first network device in accordance with the first message that a failure occurs on the radio link established between the user equipment and the second network device, the method further includes: sending the second message to the user equipment in accordance with the first message, wherein the second message is used to instruct the user equipment to release the cell, the SCG slave group, the TAG advance group, or the unidirectional channel; and / or sending a third message to the second network device in accordance with the first message, the third message being used to instruct the second network device to release a resource used to service user equipment.

[0032] With reference to a fifth possible implementation form of the third aspect, in a sixth possible implementation form of the third aspect, sending a second message to user equipment in accordance with the first message includes:

determining the SCG identifier to which the cell corresponding to the radio link on which the failure occurs, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG, as the first release identifier, if the first message is not carries an identifier associated with a link failure; or

determining a first release identifier in accordance with an identifier associated with a communication failure if the first message carries an identifier associated with a communication failure; and

sending a second message to the user equipment, the second message carrying the first release identifier.

[0033] With reference to a sixth possible implementation form of the third aspect, in a seventh possible implementation form of the third aspect, determining a first release identifier in accordance with an identifier associated with a communication link failure includes:

determining a cell identifier as a first release identifier when the identifier associated with a communication link failure includes an identifier of a cell corresponding to a radio link on which a failure occurs; or

determining the SCG identifier, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG as the first release identifier when the link failure identifier includes the SCG identifier to which the cell belongs, the corresponding radio link on which the failure occurs; or

determining a TAG or cell identifier included in the TAG as a first release identifier when the link failure identifier includes the TAG identifier to which the cell belongs, corresponding to the radio link on which the failure occurs; or

determining the identifier of the SCG serving the unidirectional channel, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG as the first release identifier when the identifier associated with the link failure includes the unidirectional channel identifier corresponding to the radio link on which the failure occurs.

[0034] With reference to a fifth possible implementation form of the third aspect, in an eighth possible implementation form of the third aspect, sending the third message to the second network device in accordance with the first message includes:

determining the user equipment identifier as the second release identifier if the first message does not carry the identifier associated with the link failure; or

determining a second release identifier in accordance with the identifier associated with the communication failure, if the first message carries the identifier associated with the communication failure; and

sending a third message to the second network device, the third message carrying a second release identifier.

[0035] With reference to the eighth possible implementation form of the third aspect, in the ninth possible implementation form of the third aspect, determining the second release identifier in accordance with the link failure identifier includes:

determining a user equipment identifier and a cell identifier as a second release identifier when the link failure identifier includes an identifier of a cell corresponding to the radio link on which the failure occurs; or

determining a user equipment identifier as a second release identifier when the link failure identifier includes an SCG identifier that owns a cell corresponding to the radio link on which the failure occurs; or

determining the user equipment identifier and the TAG identifier as the second release identifier, or determining the user equipment identifier and the cell identifier included in the TAG as the second release identifier when the link failure identifier includes the TAG identifier to which the cell corresponding the radio link on which the failure occurs; or

determining a user equipment identifier as a second release identifier, or determining a user equipment identifier and a unidirectional channel identifier served by an SCG serving a unidirectional channel as a second release identifier when the link failure identifier includes an unidirectional channel identifier corresponding to a radio link on which the failure occurs.

[0036] With reference to the third aspect or any possible implementation type from the first possible implementation type of the third aspect to the ninth possible implementation type of the third aspect, in the tenth possible implementation form of the third aspect, before receiving the first message, the method further includes:

sending the first configuration parameter to the user equipment, wherein the first configuration parameter includes one or more of the following parameters: a maximum number of retransmissions of a random access preamble, a timer duration and a maximum number of retransmissions of uplink data of an RLC radio control link; and / or

sending a second configuration parameter to a second network device, wherein the second configuration parameter includes one or more of the following parameters: maximum number of retries to receive a random access request, maximum number of retransmissions of a physical downlink control channel PDCCH, maximum number of retransmissions of downlink RLC data , a predefined frequency of blocks with errors and a predefined frequency of occurrence of erroneous bits.

[0037] In accordance with a fourth aspect, an apparatus for processing a radio link failure is provided, and it is located on the user equipment side, the apparatus including:

a detection unit configured to detect if a failure occurs on a radio link established between the user equipment and the second network device; and

a sending unit configured to send a first message to the first network device when the detection unit detects that a failure occurs on a radio link established between the user equipment and the second network device, the first message being used to indicate that a failure occurs on the radio link established between the user equipment and a second network device.

[0038] With reference to the fourth aspect, in a first possible implementation form of the fourth aspect, the detection unit is configured, in particular, for:

determining that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of the random access request by the user equipment on the first radio link reaches or exceeds the maximum number of retransmissions of the random access preamble, the first radio link being any radio link established between the user equipment and the second network device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the timer corresponding to the first cell reaches or exceeds the timer duration, the first cell being any one hundredth of the second network device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of the uplink data for controlling the RLC radio by the user equipment on the first unidirectional radio channel reaches or exceeds the maximum number of retransmissions of the uplink data RLC, wherein the first unidirectional radio channel is any unidirectional radio channel through which the second network your device serves the user equipment and is carried over one or more radio links established between the user equipment and the second network device.

[0039] With reference to a first possible implementation form of the fourth aspect, in a second possible implementation form of the fourth aspect, the device further includes:

a receiving unit, configured to receive a configuration parameter, wherein the configuration parameter includes one or more of the following parameters:

the maximum number of retransmissions of the random access preamble, the duration of the timer, and the maximum number of retransmissions of RLC uplink data, the configuration parameter being received by the first network device from the second network device and sent to the user equipment, or the configuration parameter sent by the second network device to the user equipment.

[0040] With reference to the fourth aspect, the first possible implementation type of the fourth aspect or the second possible implementation type of the fourth aspect in the third possible implementation type of the fourth aspect, the first message carries an identifier associated with a communication failure, and the identifier associated with a communication failure includes one or several of the following identifiers: the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, respectively the radio link on which the failure occurs, the identifier of the TAG advance group to which the cell belongs, the corresponding radio link on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

[0041] With reference to the fourth aspect, the first possible implementation type of the fourth aspect, the second possible implementation type of the fourth aspect, or the third possible implementation type of the fourth aspect in the fourth possible implementation type of the fourth aspect, the first message carries the cause of the link failure.

[0042] With reference to the fourth possible implementation type of the fourth aspect in the fifth possible implementation form of the fourth aspect, the cause of the link failure includes: a random access problem, a number of retransmissions of a random access preamble reaching or exceeding a maximum number of retransmissions of a random access preamble, number RLC uplink data retransmissions reaching or exceeding the maximum number of RLC uplink data retransmissions, ok nchanie timer or failure reconfiguration.

[0043] With reference to the fourth aspect, the first possible implementation form of the fourth aspect, the second possible implementation form of the fourth aspect, the third possible implementation form of the fourth aspect, the fourth possible implementation form of the fourth aspect, or the fifth possible implementation form of the fourth aspect, in the sixth possible implementation form of the fourth aspect of the receiving unit is further configured to receive a command message sent by the first network device, and the command message is used to issue a user command equipment free cell subordinate cell group SCG, timing advance TAG group or a unidirectional channel; and the device further includes:

a release unit configured to release a cell, SCG, TAG, or unidirectional channel in accordance with a command message.

[0044] With reference to a sixth possible implementation form of the fourth aspect, in a seventh possible implementation form of the fourth aspect, the release unit is configured, in particular, for:

releasing the SCG corresponding to the second network device when the command message does not carry the release identifier; or

release a cell, SCG, TAG, or unidirectional channel according to the release identifier when the command message carries the release identifier.

[0045] With reference to a seventh possible implementation type of the fourth aspect, in an eighth possible implementation type of the fourth aspect, when the command message carries the release identifier, the release unit is configured, in particular, for:

cell release, when the release identifier is a cell identifier, and the cell is a sub cell in the SCG;

releasing the SCG when the release identifier is the cell identifier and the cell is the main cell in the SCG, or when the release identifier is the SCG identifier, or when the release identifier is the identifiers of all cells included in the SCG;

TAG releases when the release identifier is a TAG identifier;

releasing a cell that is in the TAG and controlled by the second network device when the release identifier is the cell identifier in the TAG; or

the release of the unidirectional channel served by the SCG when the release identifier is the identifier of the unidirectional channel served by the SCG.

[0046] In accordance with a fifth aspect, an apparatus for detecting a radio link failure is provided, and it is located on the side of a second network device, the apparatus including:

a detection unit configured to detect if a failure occurs on a radio link established between the user equipment and the second network device; and

an interface unit configured to forward the first message to the first network device when the detection unit detects that a failure occurs on a radio link established between the user equipment and the second network device, the first message being used to indicate that a failure occurs on the radio link established between the user equipment and a second network device.

[0047] With reference to the fifth aspect, in a first possible implementation form of the fifth aspect, the detection unit is configured, in particular, for:

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the number of attempts to receive the random access request sent by the user equipment by the second network device on the first radio link reaches or exceeds the maximum number of attempts to receive the random access request wherein the first radio link is any radio link established between the user equipment and the WTO th network device; or

determining that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that sending information of the physical downlink control channel PDCCH to the second network device to the user equipment on the first radio link reaches or exceeds the maximum number of PDCCH retransmissions, wherein the first radio link is any radio link established between the user equipment and the second network device Twomey; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of downlink data for controlling the RLC of the second network device over the first unidirectional radio channel reaches or exceeds the maximum number of retransmissions of downlink data RLC communication, the first unidirectional radio channel being any unidirectional radio channel through which the second network the building serves user equipment and which is carried over one or more radio links established between the user equipment and the second network device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the frequency of blocks with errors in the uplink data sent by the user equipment and received on the first radio link by the second network device is greater than or equal to previously a given frequency of blocks with errors, the first radio link being any radio link established between the user equipment and the second etevym device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the frequency of erroneous bits of the uplink data sent by the user equipment and received on the first radio link by the second network device is greater than or equal to previously a given frequency of occurrence of erroneous discharges, the first radio link being any radio link established between the user equipment and a second network device.

[0048] With reference to a first possible implementation type of the fifth aspect, in a second possible implementation type of the fifth aspect, the interface unit is further configured to receive a configuration parameter sent by the first network device, the configuration parameter including one or more of the following parameters:

the maximum number of attempts to accept a random access request, the maximum number of retransmissions of a PDCCH, the maximum number of retransmissions of RLC downlink data, a predetermined frequency of errored blocks and a predetermined frequency of occurrence of erroneous bits.

[0049] With reference to the fifth aspect, the first possible implementation type of the fifth aspect or the second possible implementation type of the fifth aspect, in the third possible implementation type of the fifth aspect, the first message carries a user equipment identifier and an identifier associated with a communication failure, and associated with a communication failure an identifier includes one or more of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

[0050] With reference to the fifth aspect, the first possible implementation type of the fifth aspect, the second possible implementation type of the fifth aspect, or the third possible implementation type of the fifth aspect in the fourth possible implementation form of the fifth aspect, the first message carries the cause of the communication link failure.

[0051] With reference to the fourth possible implementation type of the fifth aspect in the fifth possible implementation form of the fifth aspect, the cause of the communication line failure includes: a random access problem, the number of times a random access request is received, reaching or exceeding the maximum number of attempts to receive a random access request, number PDCCH retransmissions reaching or exceeding the maximum number of PDCCH retransmissions, RLC downlink data retransmissions reaching or exceeding the maximum number of retransmissions of RLC downlink data, the block frequency with errors in the uplink data, reaching or exceeding the predefined block frequency with the errors, the frequency of occurrence of erroneous bits in the data of the uplink, reaching or exceeding the predefined frequency of occurrence of the erroneous bits , an uplink reception problem or a downlink sending problem.

[0052] With reference to the fifth aspect, the first possible implementation type of the fifth aspect, the second possible implementation type of the fifth aspect, the third possible implementation type of the fifth aspect, the fourth possible implementation form of the fifth aspect, or the fifth possible implementation form of the fifth aspect, in the sixth possible implementation form of the fifth aspect of the interface unit is additionally configured to receive a command message sent by the first network device, and the command message is used to issue a command to the second network device odit resource used to serve a user equipment and the device further includes:

a release unit configured to release a resource used to service user equipment in accordance with a command message.

[0053] With reference to the sixth possible implementation form of the fifth aspect, in the seventh possible implementation form of the fifth aspect, the release unit is configured, in particular, for:

releasing a resource used to service user equipment when the command message includes an identifier of the user equipment; or releasing a cell resource used to service the user equipment when the command message includes a user equipment identifier and a cell identifier; or

releasing the TAG resource used to service the user equipment when the command message includes a user equipment identifier and a TAG identifier; or

releasing a cell resource included in the TAG and managed by the second network device used to service the user equipment when the command message includes an identifier of the user equipment and an identifier of the cell included in the TAG; or

releasing the resource used to service the unidirectional channel of the user equipment when the command message includes the identifier of the user equipment and the identifier of the unidirectional channel.

[0054] In accordance with a sixth aspect, an apparatus for processing a radio link failure is provided, and it is located on the side of the first network device, the apparatus including:

a transceiver unit configured to communicate with user equipment;

an interface unit configured to communicate with a second network device;

a receiving unit configured to receive a first message from a user equipment or a second network device through a transceiver unit or an interface unit, the first message being sent to the first network device by the user equipment or the second network device when a failure occurs on a radio link established between the user equipment and the second network device and

a determination unit configured to determine, in accordance with the first message, that a failure occurs on a radio link established between the user equipment and the second network device.

[0055] With reference to the sixth aspect, in a first possible implementation of the sixth aspect, the first message carries an identifier associated with a communication failure, and the identifier associated with a communication failure includes one or more of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

[0056] With reference to the first possible implementation type of the sixth aspect, in the second possible implementation form of the sixth aspect, the first message further carries the user equipment identifier.

[0057] With reference to the sixth aspect, the first possible implementation type of the sixth aspect or the second possible implementation type of the sixth aspect in the third possible implementation form of the sixth aspect, the first message carries the cause of the communication line failure.

[0058] With reference to a third possible implementation type of the sixth aspect in a fourth possible implementation type of the sixth aspect, the cause of the link failure includes: random access problem, the number of retransmissions of the random access preamble reaching or exceeding the maximum number of retransmissions of the uplink RLC data , the number of retransmissions of RLC uplink data that reaches or exceeds the maximum number of retransmissions of RLC uplink data, the end e timer, reconfiguration failure, the number of times a random access request is received, reaching or exceeding the maximum number of attempts to receive a random access request, the number of PDCCH retransmissions, reaching or exceeding the maximum number of PDCCH retransmissions, the number of retransmissions of RLC downlink data, reaching or exceeding the maximum number of retransmissions of RLC downlink data, the uplink data block error rate reaching or exceeding higher than a predetermined frequency of errored blocks, the frequency of occurrence of erroneous bits in the uplink data, reaching or exceeding a predetermined frequency of occurrence of erroneous discharges, a reception problem on the uplink or a send problem on the downlink.

[0059] With reference to the sixth aspect, the first possible implementation type of the sixth aspect, the second possible implementation type of the sixth aspect, the third possible implementation type of the sixth aspect, or the fourth possible implementation type of the sixth aspect in the fifth possible implementation form of the sixth aspect after the determination unit determines that a failure occurs on the radio link established between the user equipment and the second network device, the determination unit is further configured to:

initiating a transceiver unit to send a second message to the user equipment, the second message being used to instruct the user equipment to release the cell, SCG slave group, TAG timing advance group, or unidirectional channel; and / or

initiating an interface unit for sending a third message to the second network device, the third message being used to instruct the second network device to release the resource used to service the user equipment.

[0060] With reference to the fifth possible implementation type of the sixth aspect in the sixth possible implementation form of the sixth aspect, the determination unit is further configured, in particular, to initiate a transceiver unit to send a second message to the user equipment carrying the first release identifier, wherein:

the first release identifier includes the SCG identifier that owns the cell corresponding to the radio link on which the failure occurs, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG when the first message does not carry link failure identifier; or

the first release identifier is determined in accordance with the link failure identifier when the first message carries the link failure identifier.

[0061] With reference to the sixth possible implementation type of the sixth aspect in the seventh possible implementation form of the sixth aspect, when the first message carries an identifier associated with a communication link failure:

the first release identifier includes a cell identifier when the identifier associated with a communication link failure includes an identifier of a cell corresponding to the radio link on which the failure occurs; or

the first release identifier includes an SCG identifier, an identifier of a cell included in an SCG, an identifier of a main cell included in an SCG, or an unidirectional channel identifier served by an SCG when the link failure identifier includes an SCG identifier to which the cell corresponding the radio link on which the failure occurs; or

the first release identifier includes a TAG identifier or an identifier of a cell included in a TAG when the link failure identifier includes a TAG identifier to which a cell belongs, corresponding to a radio link on which a failure occurs; or

the first release identifier includes an identifier of an SCG serving a unidirectional channel, an identifier of a cell included in an SCG, an identifier of a main cell included in an SCG, or an identifier of a unidirectional channel served by an SCG, when the identifier associated with a link failure includes an unidirectional channel identifier, corresponding radio link on which the failure occurs.

[0062] With reference to the fifth possible implementation type of the sixth aspect in the eighth possible implementation form of the sixth aspect, the determination unit is further configured, in particular, to initiate an interface unit for sending to the second network device a third message carrying the second release identifier, wherein:

the second release identifier includes an identifier of a user equipment when the first message does not carry an identifier associated with a link failure; or

the second release identifier is determined in accordance with the link failure identifier when the first message carries the link failure identifier.

[0063] With reference to the eighth possible implementation form of the sixth aspect in the ninth possible implementation form of the sixth aspect, when the first message carries an identifier associated with a communication failure:

the second release identifier includes a user equipment identifier and a cell identifier when the identifier associated with a communication link failure includes an identifier of a cell corresponding to the radio link on which the failure occurs; or

the second release identifier includes a user equipment identifier when the identifier associated with a communication link failure includes an SCG identifier to which a cell belongs, corresponding to a radio link on which a failure occurs; or

the second release identifier includes a user equipment identifier and a TAG identifier, or includes a user equipment identifier and an identifier of a cell included in a TAG when the link failure identifier includes a TAG identifier that owns a cell corresponding to the radio link on which a failure occurs; or

the second release identifier includes a user equipment identifier or includes a user equipment identifier and an unidirectional channel identifier served by an SCG serving a unidirectional channel when the link failure identifier includes an unidirectional channel identifier corresponding to the radio link on which the failure occurs .

[0064] With reference to the sixth aspect or any possible implementation type from the first possible implementation type of the sixth aspect to the ninth possible implementation type of the sixth aspect, in the tenth possible implementation form of the sixth aspect, the transceiver unit is further configured, in particular for:

sending the first configuration parameter to the user equipment, wherein the first configuration parameter includes one or more of the following parameters: a maximum number of retransmissions of a random access preamble, a timer duration and a maximum number of retransmissions of uplink data of an RLC radio control link; and / or

sending the second configuration parameter to the second network device, the second configuration parameter including one or more of the following parameters: the maximum number of attempts to receive a random access request, the maximum number of retransmissions of a physical downlink control channel PDCCH, the maximum number of retransmissions of RLC downlink data , a predefined frequency of blocks with errors and a predefined frequency of occurrence of erroneous bits.

[0065] In embodiments of the present invention, when the user equipment or the slave base station detects that a radio link failure occurs between the UE and the slave base station, the user equipment or the slave base station sends a message to the main base station to notify the main base station that that a radio link failure occurs between the UE and the slave base station, so that the main base station learns that a radio link failure occurs between the UE and the slave hydrochloric base station, and therefore can not perform unnecessary operation, such as SRB recovery and re-activation of security. In addition, the main base station can also perform additional processing in the event of a radio link failure, for example, free up a resource associated with a slave base station and / or UE, so that the slave base station reallocates the resource to that UE as soon as possible, thereby effectively reducing user interruption time data caused by a radio link failure, and improving user experience for the user.

A method for processing a radio link failure is disclosed, the method comprising the steps of:

detecting by the user equipment whether a failure occurs on a radio link established between the user equipment and the second network device; and

send, using the user equipment, a first message to the first network device when it is detected that a failure occurs on a radio link established between the user equipment and the second network device, the first message being used to indicate that a failure occurs on a radio link established between the user equipment and the second network device.

At the same time, it is detected with the help of the user equipment whether a failure occurs on the radio link established between the user equipment and the second network device, comprising the steps in which:

determining that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of the random access request by the user equipment on the first radio link reaches or exceeds the maximum number of retransmissions of the random access preamble, the first radio link being any radio link established between the user equipment and the second network device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the timer corresponding to the first cell reaches or exceeds the timer duration, the first cell being any one hundredth of the second network device; or

determine that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of the uplink data for controlling the RLC radio by the user equipment on the first unidirectional radio channel reaches or exceeds the maximum number of retransmissions of the uplink data RLC, wherein the first unidirectional radio channel is any unidirectional radio channel through which the second network The second device serves user equipment and which is carried on one or more radio links established between the user equipment and the second network device.

In this case, before the stage at which it is detected using the user equipment, whether there is a failure on the radio link established between the user equipment and the second network device, the stage at which:

take a configuration parameter, and the configuration parameter contains one or more of the following parameters:

the maximum number of retransmissions of the random access preamble, the duration of the timer, and the maximum number of retransmissions of RLC uplink data, the configuration parameter being received by the first network device from the second network device and sent to the user equipment, or the configuration parameter sent by the second network device to the user equipment.

In this case, the first message carries the identifier associated with the communication line failure, and the identifier associated with the communication line failure contains one or more of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

In this case, the first message carries the reason for the failure of the communication line.

Moreover, the cause of the communication line failure contains: a random access problem, the number of retransmissions of the random access preamble reaching or exceeding the maximum number of retransmissions of the random access preamble, the number of retransmissions of the uplink RLC data reaching or exceeding the maximum number of retransmissions of the uplink data RLC communications, timer expiration, or reconfiguration failure.

Moreover, after the stage at which the first message is sent using the user equipment to the first network device, the stages are:

receiving a command message sent by the first network device, the command message being used to instruct the user equipment to release a cell, a group of subordinate SCG cells, a TAG timing advance group, or a unidirectional channel; and

release the cell, SCG, TAG or unidirectional channel in accordance with the command message.

At the same time, they release the cell, SCG, TAG or unidirectional channel in accordance with the command message, contains the stages in which:

release the SCG corresponding to the second network device when the command message does not carry the release identifier; or

release the cell, SCG, TAG or unidirectional channel in accordance with the release identifier when the command message carries the release identifier.

At the same time, release the cell, SCG, TAG or unidirectional channel in accordance with the release identifier, contains the steps in which:

release a cell when the release identifier is a cell identifier and the cell is a sub cell in the SCG;

release the SCG when the release identifier is the cell identifier and the cell is the main cell in the SCG, or when the release identifier is the SCG identifier, or when the release identifier is the identifiers of all cells contained in the SCG;

release the TAG when the release identifier is a TAG identifier;

release the cell that is in the TAG and is controlled by the second network device when the release identifier is the cell identifier in the TAG; or

release the unidirectional channel served by the SCG when the release identifier is the identifier of the unidirectional channel served by the SCG.

A method for processing a radio link failure is disclosed, the method comprising the steps of:

detect with a second network device whether a failure occurs on a radio link established between the user equipment and the second network device; and

using the second network device, the first message is sent to the first network device when it is detected that a failure occurs on the radio link established between the user equipment and the second network device, the first message being used to indicate that a failure occurs on the radio link established between the user equipment and second network device.

In this case, it is detected with the help of the second network device whether a failure occurs on the radio link established between the user equipment and the second network device, comprises the steps in which:

determine that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the number of attempts to receive the random access request sent by the user equipment by the second network device on the first radio link reaches or exceeds the maximum number of attempts to receive the random access request wherein the first radio link is any radio link established between the user equipment and the second m network device; or

determining that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that sending information of the physical downlink control channel PDCCH by the second network device to the user equipment on the first radio link reaches or exceeds the maximum number of PDCCH retransmissions, wherein the first radio link is any radio link established between the user equipment and the second network device tion; or

determine that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of the downlink data for controlling the RLC of the second network device on the first unidirectional radio channel reaches or exceeds the maximum number of retransmissions of the downlink data RLC communication, the first unidirectional radio channel being any unidirectional radio channel through which the second network device the trio serves the user equipment and which is carried over one or more radio links established between the user equipment and the second network device; or

determine that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the frequency of blocks with errors in the uplink data sent by the user equipment and received on the first radio link by the second network device is greater than or equal to previously a given frequency of blocks with errors, the first radio link being any radio link established between the user equipment and the second tevym device; or

determine that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the frequency of erroneous bits in the uplink data sent by the user equipment and received on the first radio link by the second network device is greater than or equal to previously a given frequency of occurrence of erroneous discharges, the first radio link being any radio link established between the user equipment and a second network device.

In this case, before the stage at which it is detected by the second network device, whether there is a failure on the radio link established between the user equipment and the second network device, the stage at which:

receive a configuration parameter sent by the first network device, and the configuration parameter contains one or more of the following parameters:

the maximum number of attempts to accept a random access request, the maximum number of retransmissions of a PDCCH, the maximum number of retransmissions of RLC downlink data, a predetermined frequency of errored blocks and a predetermined frequency of occurrence of erroneous bits.

In this case, the first message carries the user equipment identifier and the identifier associated with the communication line failure, and the identifier associated with the communication line failure contains one or more of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

In this case, the first message carries the reason for the failure of the communication line.

At the same time, the cause of the communication line failure includes: a random access problem, the number of times a random access request is received, reaching or exceeding the maximum number of attempts to receive a random access request, the number of PDCCH retransmissions, reaching or exceeding the maximum number of PDCCH retransmissions, the number of downlink data retransmissions RLC communication line, reaching or exceeding the maximum number of retransmissions of RLC downlink data, data rate of data units with errors of uplink communication, reaching or exceeding a predetermined frequency of errored blocks, the frequency of occurrence of erroneous bits in the data of the uplink, reaching or exceeding a predetermined frequency of occurrence of erroneous discharges, a reception problem on the uplink or a sending problem on the downlink.

Moreover, after the stage at which the first message is sent using the second network device to the first network device, the steps are:

receiving a command message sent by the first network device, the command message being used to instruct the second network device to release a resource used to service user equipment; and

release the resource used to service the user equipment in accordance with the command message.

At the same time, the resource used for servicing the user equipment is released, in accordance with the command message, it contains the stages in which:

releasing a resource used for servicing user equipment when the command message contains an identifier of the user equipment; or

freeing up a cell resource used to service the user equipment when the command message comprises a user equipment identifier and a cell identifier; or

free the TAG resource used to service the user equipment when the command message contains a user equipment identifier and a TAG identifier; or

freeing up the resource of the cell contained in the TAG and managed by the second network device used to service the user equipment when the command message contains the identifier of the user equipment and the cell identifier in the TAG; or

release the resource used to service the unidirectional channel of the user equipment when the command message contains the identifier of the user equipment and the identifier of the unidirectional channel.

A method for processing a radio link failure is disclosed, the method comprising the steps of:

receiving the first message with the first network device, the first message being sent to the first network device by the user equipment or the second network device when a failure occurs on a radio link established between the user equipment and the second network device; and

determine, using the first network device in accordance with the first message, that a failure occurs on the radio link established between the user equipment and the second network device.

In this case, the first message carries the identifier associated with the communication line failure, and the identifier associated with the communication line failure contains one or more of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

In this case, the first message additionally carries the identifier of the user equipment.

In this case, the first message carries the reason for the failure of the communication line.

At the same time, the cause of the communication line failure contains: a random access problem, the number of retransmissions of the random access preamble reaching or exceeding the maximum number of retransmissions of RLC uplink data, the number of retransmissions of RLC uplink data reaching or exceeding the maximum number of retransmissions RLC uplink, timer expiration, reconfiguration failure, number of times a random access request is received, reaching or exceeding a poppy the total number of attempts to receive a random access request, the number of PDCCH retransmissions reaching or exceeding the maximum number of PDCCH retransmissions, the number of retransmissions of RLC downlink data, reaching or exceeding the maximum number of retransmissions of RLC downlink data, the block frequency of data errors uplink communication, reaching or exceeding a predetermined frequency of blocks with errors, the frequency of occurrence of erroneous bits in the data of the ascending communication lines reaching or exceeding a predetermined frequency of occurrence of erroneous bits, the problem of reception on the uplink or the problem of sending on the downlink.

Moreover, after the stage at which it is determined using the first network device in accordance with the first message that there is a failure on the radio link established between the user equipment and the second network device, the steps are:

sending a second message to the user equipment in accordance with the first message, the second message being used to instruct the user equipment to release the cell, SCG slave group, TAG timing advance group, or unidirectional channel; and / or

sending a third message to the second network device in accordance with the first message, the third message being used to instruct the second network device to release the resource used to service the user equipment.

At the same time, the second message is sent to the user equipment in accordance with the first message, it contains the steps in which:

determining the SCG identifier that owns the cell corresponding to the radio link on which the failure occurs, the identifier of the cell contained in the SCG, the identifier of the main cell contained in the SCG, or the identifier of the unidirectional channel served by the SCG, as the first release identifier, if the first message is not carries an identifier associated with a link failure; or

determining a first release identifier in accordance with an identifier associated with a link failure if the first message carries an identifier associated with the link failure; and

sending a second message to the user equipment, the second message carrying the first release identifier.

In this case, the first release identifier is determined in accordance with the identifier associated with the failure of the communication line, it comprises the steps in which:

determining a cell identifier as a first release identifier when the identifier associated with a link failure contains an identifier of a cell corresponding to the radio link on which the failure occurs; or

determining the SCG identifier, the identifier of the cell contained in the SCG, the identifier of the main cell contained in the SCG, or the identifier of the unidirectional channel served by the SCG as the first release identifier when the link failure identifier contains the SCG identifier to which the cell corresponding to the line belongs radio communication on which the failure occurs; or

determining a TAG identifier or an identifier of a cell contained in the TAG as a first release identifier when the link failure identifier contains the TAG identifier to which the cell belongs, corresponding to the radio link on which the failure occurs; or

determining the identifier of the SCG serving the unidirectional channel, the identifier of the cell contained in the SCG, the identifier of the main cell contained in the SCG, or the identifier of the unidirectional channel served by the SCG, as the first release identifier, when the identifier associated with the link failure contains the identifier of the unidirectional channel corresponding to radio link on which the failure occurs.

In this case, the third message is sent to the second network device in accordance with the first message, it comprises the steps in which:

determining a user equipment identifier as a second release identifier if the first message does not carry an identifier associated with a link failure; or

determining a second release identifier in accordance with the identifier associated with the communication failure, if the first message carries the identifier associated with the communication failure; and

sending a third message to the second network device, the third message transferring a second release identifier.

In this case, the second release identifier is determined in accordance with the identifier associated with the failure of the communication line, it comprises the steps in which:

determining a user equipment identifier and a cell identifier as a second release identifier when the identifier associated with a communication link failure contains an identifier of a cell corresponding to the radio link on which the failure occurs; or

determining the user equipment identifier as the second release identifier when the identifier associated with the link failure contains the SCG identifier to which the cell belongs, corresponding to the radio link on which the failure occurs; or

determining a user equipment identifier and a TAG identifier as a second release identifier, or determining a user equipment identifier and a cell identifier contained in a TAG as a second release identifier when the link failure identifier contains the TAG identifier that owns the cell corresponding to the radio link on which a failure occurs; or

determining the user equipment identifier as the second release identifier, or determining the user equipment identifier and the identifier of the unidirectional channel served by the SCG serving the unidirectional channel as the second release identifier when the identifier associated with the link failure contains the identifier of the unidirectional channel corresponding to the radio link, which a failure occurs.

In this case, before the stage at which the first message is received, the stages in which:

sending the first configuration parameter to the user equipment, the first configuration parameter containing one or more of the following parameters: the maximum number of retransmissions of the random access preamble, the duration of the timer, and the maximum number of retransmissions of the uplink data of the radio control link RLC; and / or

sending the second configuration parameter to the second network device, the second configuration parameter containing one or more of the following parameters: the maximum number of retries to receive a random access request, the maximum number of retransmissions of a physical downlink control channel PDCCH, the maximum number of retransmissions of RLC downlink data, previously a predetermined frequency of blocks with errors and a predetermined frequency of occurrence of erroneous bits.

A device for processing a radio link failure located on the user equipment side is disclosed, the device comprising:

a detection unit configured to detect if a failure occurs on a radio link established between the user equipment and the second network device; and

a sending unit configured to send a first message to the first network device when the detection unit detects that a failure occurs on a radio link established between the user equipment and the second network device, the first message being used to indicate that a failure occurs on the radio link established between the user equipment and a second network device.

In this case, the detection unit is configured, in particular, for:

determining that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of the random access request by the user equipment on the first radio link reaches or exceeds the maximum number of retransmissions of the random access preamble, the first radio link being any radio link established between the user equipment and the second network device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the timer corresponding to the first cell reaches or exceeds the timer duration, the first cell being any one hundredth of the second network device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of the uplink data for controlling the RLC radio by the user equipment on the first unidirectional radio channel reaches or exceeds the maximum number of retransmissions of the uplink data RLC, wherein the first unidirectional radio channel is any unidirectional radio channel through which the second network your device serves the user equipment and is carried over one or more radio links established between the user equipment and the second network device.

Moreover, the device further comprises:

a receiving unit configured to receive a configuration parameter, the configuration parameter comprising one or more of the following parameters:

the maximum number of retransmissions of the random access preamble, the duration of the timer, and the maximum number of retransmissions of RLC uplink data, the configuration parameter being received by the first network device from the second network device and sent to the user equipment, or the configuration parameter sent by the second network device to the user equipment.

In this case, the first message carries the identifier associated with the communication line failure, and the identifier associated with the communication line failure contains one or more of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

In this case, the first message carries the reason for the failure of the communication line.

Moreover, the cause of the communication line failure contains: a random access problem, the number of retransmissions of the random access preamble reaching or exceeding the maximum number of retransmissions of the random access preamble, the number of retransmissions of the uplink RLC data reaching or exceeding the maximum number of retransmissions of the uplink data RLC communications, timer expiration, or reconfiguration failure.

Moreover, the reception unit is further configured to receive a command message sent by the first network device, the command message being used to instruct the user equipment to release a cell, a group of subordinate SCG cells, a TAG timing group or a unidirectional channel; and the device further comprises:

a release unit configured to release a cell, SCG, TAG, or unidirectional channel in accordance with a command message.

In this case, the release unit is configured, in particular, for:

releasing the SCG corresponding to the second network device when the command message does not carry the release identifier; or

release a cell, SCG, TAG, or unidirectional channel according to the release identifier when the command message carries the release identifier.

Moreover, when the command message transfers the release identifier, the release unit is configured, in particular, for:

cell release, when the release identifier is a cell identifier, and the cell is a sub cell in the SCG;

releasing the SCG when the release identifier is the cell identifier and the cell is the main cell in the SCG, or when the release identifier is the SCG identifier, or when the release identifier is the identifiers of all cells contained in the SCG;

TAG releases when the release identifier is a TAG identifier;

releasing a cell that is in the TAG and controlled by the second network device when the release identifier is the cell identifier in the TAG; or

the release of the unidirectional channel served by the SCG when the release identifier is the identifier of the unidirectional channel served by the SCG.

A device for processing a radio link failure located on the side of a second network device is disclosed, comprising:

a detection unit configured to detect if a failure occurs on a radio link established between the user equipment and the second network device;

an interface unit configured to forward the first message to the first network device when the detection unit detects that a failure occurs on a radio link established between the user equipment and the second network device, the first message being used to indicate that a failure occurs on the radio link established between the user equipment and a second network device.

In this case, the detection unit is configured, in particular, for:

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the number of attempts to receive the random access request sent by the user equipment by the second network device on the first radio link reaches or exceeds the maximum number of attempts to receive the random access request wherein the first radio link is any radio link established between the user equipment and the WTO th network device; or

determining that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that sending information of the physical downlink control channel PDCCH to the second network device to the user equipment on the first radio link reaches or exceeds the maximum number of PDCCH retransmissions, wherein the first radio link is any radio link established between the user equipment and the second network device Twomey; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of downlink data for controlling the RLC of the second network device over the first unidirectional radio channel reaches or exceeds the maximum number of retransmissions of downlink data RLC communication, the first unidirectional radio channel being any unidirectional radio channel through which the second network the building serves user equipment and which is carried over one or more radio links established between the user equipment and the second network device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the frequency of blocks with errors in the uplink data sent by the user equipment and received on the first radio link by the second network device is greater than or equal to previously a given frequency of blocks with errors, the first radio link being any radio link established between the user equipment and the second etevym device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the frequency of erroneous bits of the uplink data sent by the user equipment and received on the first radio link by the second network device is greater than or equal to previously a given frequency of occurrence of erroneous discharges, the first radio link being any radio link established between the user equipment and a second network device.

At the same time, the interface unit is additionally configured to receive the configuration parameter sent by the first network device, and the configuration parameter contains one or more of the following parameters:

the maximum number of attempts to accept a random access request, the maximum number of retransmissions of a PDCCH, the maximum number of retransmissions of RLC downlink data, a predetermined frequency of errored blocks and a predetermined frequency of occurrence of erroneous bits.

In this case, the first message carries the user equipment identifier and the identifier associated with the communication line failure, and the identifier associated with the communication line failure contains one or more of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

In this case, the first message carries the reason for the failure of the communication line.

At the same time, the cause of the communication line failure includes: a random access problem, the number of times a random access request is received, reaching or exceeding the maximum number of attempts to receive a random access request, the number of PDCCH retransmissions, reaching or exceeding the maximum number of PDCCH retransmissions, the number of downlink data retransmissions RLC communication line, reaching or exceeding the maximum number of retransmissions of RLC downlink data, data rate of data units with errors of uplink communication, reaching or exceeding a predetermined frequency of errored blocks, the frequency of occurrence of erroneous bits in the data of the uplink, reaching or exceeding a predetermined frequency of occurrence of erroneous discharges, a reception problem on the uplink or a sending problem on the downlink.

In this case, the interface unit is further configured to receive a command message sent by the first network device, the command message being used to instruct the second network device to release a resource used to service user equipment; and the device further comprises:

a release unit configured to release a resource used to service user equipment in accordance with a command message.

In this case, the release unit is configured, in particular, for:

releasing the resource used to service the user equipment when the command message contains the identifier of the user equipment; or

releasing a cell resource used to service the user equipment when the command message comprises a user equipment identifier and a cell identifier; or

releasing the TAG resource used to service the user equipment when the command message comprises a user equipment identifier and a TAG identifier; or

releasing a cell resource contained in the TAG and managed by a second network device used to service the user equipment when the command message contains the identifier of the user equipment and the identifier of the cell contained in the TAG; or

releasing the resource used to service the unidirectional channel of the user equipment when the command message contains the identifier of the user equipment and the identifier of the unidirectional channel.

A device for processing a radio link failure located on the side of the first network device is disclosed, comprising:

a transceiver unit configured to communicate with user equipment;

an interface unit configured to communicate with a second network device;

a receiving unit configured to receive a first message from a user equipment or a second network device through a transceiver unit or an interface unit, the first message being sent to the first network device by the user equipment or the second network device when a failure occurs on a radio link established between the user equipment and the second network device and

a determination unit configured to determine, in accordance with the first message, that a failure occurs on a radio link established between the user equipment and the second network device.

In this case, the first message carries the identifier associated with the communication line failure, and the identifier associated with the communication line failure contains one or more of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

In this case, the first message additionally carries the identifier of the user equipment.

In this case, the first message carries the reason for the failure of the communication line.

At the same time, the cause of the communication line failure contains: a random access problem, the number of retransmissions of the random access preamble reaching or exceeding the maximum number of retransmissions of RLC uplink data, the number of retransmissions of RLC uplink data reaching or exceeding the maximum number of retransmissions RLC uplink, timer expiration, reconfiguration failure, number of times a random access request is received, reaching or exceeding a poppy the total number of attempts to receive a random access request, the number of PDCCH retransmissions reaching or exceeding the maximum number of PDCCH retransmissions, the number of retransmissions of RLC downlink data, reaching or exceeding the maximum number of retransmissions of RLC downlink data, the block frequency of data errors uplink communication, reaching or exceeding a predetermined frequency of blocks with errors, the frequency of occurrence of erroneous bits in the data of the ascending communication lines reaching or exceeding a predetermined frequency of occurrence of erroneous bits, the problem of reception on the uplink or the problem of sending on the downlink.

Moreover, after the determination unit determines that there is a failure on the radio link established between the user equipment and the second network device, the determination unit is further configured to:

initiating a transceiver unit to send a second message to the user equipment, the second message being used to instruct the user equipment to release the cell, SCG slave group, TAG timing advance group, or unidirectional channel; and / or

initiating an interface unit for sending a third message to the second network device, the third message being used to instruct the second network device to release the resource used to service the user equipment.

In this case, the determination unit is further configured, in particular, to initiate the transceiver unit for sending to the user equipment a second message carrying the first release identifier, wherein:

the first release identifier contains the SCG identifier that owns the cell corresponding to the radio link on which the failure occurs, the identifier of the cell contained in the SCG, the identifier of the main cell contained in the SCG, or the identifier of the unidirectional channel served by the SCG when the first message does not carry associated link failure identifier; or

the first release identifier is determined in accordance with the link failure identifier when the first message carries the link failure identifier.

In this case, when the first message carries the identifier associated with the failure of the communication line:

the first release identifier contains a cell identifier when the identifier associated with a communication link failure contains a cell identifier corresponding to the radio link on which the failure occurs; or

the first release identifier contains the SCG identifier, the identifier of the cell contained in the SCG, the identifier of the main cell contained in the SCG, or the identifier of the unidirectional channel served by the SCG when the link failure identifier contains the SCG identifier to which the cell corresponding to the radio link belongs which a failure occurs; or

the first release identifier contains a TAG identifier or an identifier of a cell contained in a TAG when the link failure identifier contains a TAG identifier to which a cell belongs, corresponding to a radio link on which a failure occurs; or

the first release identifier contains the identifier of the SCG serving the unidirectional channel, the identifier of the cell contained in the SCG, the identifier of the main cell contained in the SCG, or the identifier of the unidirectional channel served by the SCG, when the identifier associated with the link failure contains the identifier of the unidirectional channel corresponding to the radio link, on which a failure occurs.

In this case, the determination unit is further configured, in particular, to initiate an interface unit for sending to the second network device a third message transferring the second release identifier, wherein:

the second release identifier contains a user equipment identifier when the first message does not carry the identifier associated with the link failure; or

the second release identifier is determined in accordance with the link failure identifier when the first message carries the link failure identifier.

In this case, when the first message carries the identifier associated with the failure of the communication line:

the second release identifier comprises a user equipment identifier and a cell identifier, when the identifier associated with a communication link failure contains an identifier of a cell corresponding to the radio link on which the failure occurs; or

the second release identifier contains the user equipment identifier when the identifier associated with the communication link failure contains the SCG identifier to which the cell belongs, corresponding to the radio link on which the failure occurs; or

the second release identifier comprises a user equipment identifier and a TAG identifier, or contains a user equipment identifier and a cell identifier contained in a TAG when the identifier associated with a communication link failure contains a TAG identifier that owns a cell corresponding to the radio link on which the failure occurs; or

the second release identifier contains the user equipment identifier or contains the user equipment identifier and the identifier of the unidirectional channel served by the SCG serving the unidirectional channel when the identifier associated with the link failure contains the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

In this case, the transceiver unit is additionally configured, in particular, for:

sending the first configuration parameter to the user equipment, the first configuration parameter containing one or more of the following parameters: the maximum number of retransmissions of the random access preamble, the duration of the timer, and the maximum number of retransmissions of the uplink data of the radio control link RLC; and / or

sending the second configuration parameter to the second network device, the second configuration parameter containing one or more of the following parameters: the maximum number of retries to receive a random access request, the maximum number of retransmissions of a physical downlink control channel PDCCH, the maximum number of retransmissions of RLC downlink data, previously a predetermined frequency of blocks with errors and a predetermined frequency of occurrence of erroneous bits.

BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly describe the technical solutions in the embodiments of the present invention, the following briefly presents the accompanying drawings necessary to describe the embodiments. Obviously, the accompanying drawings in the following description show only some embodiments of the present invention, and one of ordinary skill in the art can still obtain other drawings from these attached drawings without creative efforts.

[0067] FIG. 1 is a schematic block diagram of a prior art network deployment;

[0068] FIG. 2 is a flowchart of a method for processing a radio link in the prior art;

[0069] FIG. 3 is a flowchart of a method for processing a radio link failure in accordance with Embodiment 1 of the present invention;

[0070] FIG. 4 is a flowchart of another method for processing a radio link failure in accordance with Embodiment 1 of the present invention;

[0071] FIG. 5 is a flowchart of a method for processing a radio link failure in accordance with Embodiment 2 of the present invention;

[0072] FIG. 6 is a flowchart of a method for processing a radio link failure in accordance with Embodiment 3 of the present invention;

[0073] FIG. 7 is a flowchart of another method for processing a radio link failure in accordance with Embodiment 3 of the present invention;

[0074] FIG. 8 is a flowchart of a method for processing a radio link failure in accordance with Embodiment 4 of the present invention;

[0075] FIG. 9 is a schematic structural diagram of an apparatus for processing a radio link failure in accordance with Embodiment 5 of the present invention;

[0076] FIG. 10 is a schematic structural diagram of another device for processing a radio link failure in accordance with Embodiment 5 of the present invention;

[0077] FIG. 11 is a schematic structural diagram of an apparatus for processing a radio link failure in accordance with Embodiment 6 of the present invention;

[0078] FIG. 12 is a schematic structural diagram of another device for processing a radio link failure in accordance with Embodiment 6 of the present invention;

[0079] FIG. 13 is a schematic structural diagram of an apparatus for processing a radio link failure in accordance with Embodiment 7 of the present invention;

[0080] FIG. 14 is a schematic structural diagram of user equipment in accordance with Embodiment 8 of the present invention;

[0081] FIG. 15 is a schematic structural diagram of a first network device in accordance with Embodiment 9 of the present invention; and

[0082] FIG. 16 is a schematic structural diagram of a second network device in accordance with Embodiment 10 of the present invention.

DESCRIPTION OF EMBODIMENTS

[0083] In order to better understand the objectives, technical solutions and advantages of the present invention, the following describes in more detail embodiments of the present invention with reference to the accompanying drawings.

[0084] Given the problem of the prior art, in embodiments of the present invention, when a radio link failure occurs between the UE and the slave base station, it is possible to report a radio link failure of the main base station, so that the main base station recognizes that there is a line failure radio communications between the UE and the slave base station, and therefore, unnecessary operations such as restoring the SRB and re-activating security can no longer be performed, thereby effectively reducing the time required Rebo user data caused by the failure of the radio link, and improving the user experience for the user. In addition, the main base station can also perform additional processing in the event of a radio link failure, for example, free up a resource associated with a slave base station and / or UE, so that the slave base station reallocates the resource to that UE as soon as possible, thereby further reducing user interruption time data caused by a radio link failure, and improving user experience for the user.

[0085] The solutions and results of the present invention are described in more detail below with reference to several embodiments. In the following embodiments, the network device may be a network node that can communicate with user equipment, and includes a base station (Base Station, BS), Node B, eNB (advanced Node B, evolved Node B), WiFi access point, etc.

[0086] The user equipment may be a mobile communication terminal, and includes a cellular phone, personal digital assistant (PDA), wireless modem (modem), handheld device (handheld), laptop computer (laptop computer) , cordless phone, etc.

Option 1 implementation

[0087] In this embodiment, when the UE detects that a radio link failure occurs between the UE and the slave base station, the UE sends a message to the main base station to notify the main base station that a radio link failure occurs between the UE and the slave base station . Referring to FIG. 3, FIG. 3 is a flowchart of a method for processing a radio link failure in accordance with an embodiment of the present invention. As shown in FIG. 3, the method includes:

[0088] S301. The UE detects whether a radio link failure occurs between the UE and the second network device, that is, the UE detects whether a failure occurs on the radio link established between the UE and the second network device. When radio links are established between the UE and several cells of the second network device, it can be specified that a radio link failure occurs between the UE and the second network device (that is, a failure occurs on the radio link established between the UE and the second network device) when failure occurs on any radio lines; or you can specify that a radio link failure occurs between the UE and the second network device (that is, a failure occurs on the radio link established between the UE and the second network device) when a failure occurs on the radio link or some radio links.

[0089] S302. The UE sends a first message to the first network device when it is detected that a radio link failure occurs between the UE and the second network device, the first message being used to indicate that a radio link failure occurs between the user equipment and the second network device. That is, the first message is sent to the first network device when it is detected that a failure occurs on a radio link established between the UE and the second network device, the first message being used to indicate that a failure occurs on a radio link established between the user equipment and the second network device; in other words, the first message is used to indicate that a radio link failure occurs between the user equipment and the second network device.

[0090] The aforementioned first network device relates to a main base station, and the second network device relates to a slave base station. When the UE detects that a radio link failure occurs between the UE and the slave base station, the UE can report the radio link failure of the main base station, so that the main base station finds out that a radio link failure occurs between the UE and the slave base station, and therefore it is already possible Do not perform unnecessary operations, such as restoring SRB and re-activating security. In addition, the main base station can perform additional processing in the event of a radio link failure, for example, free up a resource associated with a slave base station and / or UE, so that the slave base station reallocates the resource to that UE as soon as possible, thereby effectively reducing the time outage of user data caused by a radio link failure, and improving user experience for the user.

[0091] The aforementioned step S301, that is, the step in which the UE detects whether a radio link failure occurs between the UE and the second network device, can be implemented in the following forms:

[0092] In a first view, it is determined that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of the random access request by the user equipment on the first radio link reaches or exceeds the maximum number of retransmissions of the random access preamble wherein the first radio link is any radio link established between the user equipment and the second network device oystvom.

[0093] Since the second network device can control several cells, the UE can establish a radio link with each of several cells controlled by the second network device, that is, the UE can establish several radio links with the second network device. When the UE sends a random access request to a second network device over a radio link established between the UE and the cell controlled by the second network device, if the random access request fails, the UE resends the random access request to the second network device over the radio link and counts the number of times (in hereinafter referred to as the first number) of re-sending the random access request to the second network device from the UE via a radio link. When the first number of times reaches or exceeds the maximum number of retransmissions of the random access preamble, the UE determines that a failure occurs on the radio link; otherwise, the UE determines that a failure on the radio link does not occur.

[0094] In a second view, it is determined that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that the timer corresponding to the first cell reaches or exceeds the timer duration, the first cell being any one hundredth of the second network device.

[0095] Since the second network device can control several cells, the UE can establish a radio link with each of several cells controlled by the second network device, that is, the UE can establish several radio links with the second network device. The UE may set timers for all or some cells of the second network device and may set one timer for each cell, and timers for different cells may have the same duration or may have different durations. When the UE detects that the quality of the downlink signal in the cell controlled by the second network device is less than or equal to a predetermined quality threshold, the corresponding timer is started. If it is detected that the quality of the downlink signal in the cell does not exceed a predetermined quality threshold for the duration of the timer, that is, it is found that the quality of the downlink signal in the cell remains less than or equal to a predetermined quality threshold, then it is determined that failure on a radio link established between the UE and the cell. If it is detected that the signal quality of the downlink of the cell is greater than the predetermined quality threshold for the duration of the timer, then the timer stops and it is determined that there is no failure on the radio link established between the UE and the cell.

[0096] In a third form, it is determined that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of uplink data for radio control (Radio Link Control, RLC) by the user equipment in the first unidirectional the radio channel reaches or exceeds the maximum number of retransmissions of uplink RLC data, wherein the first unidirectional radio channel is any unidirectional radio anal, for which the second network device serving a user equipment and which is carried on one or more radio links established between the user equipment and the second network device.

[0097] Since the second network device can control several cells, the UE can establish a radio link with each of several cells controlled by the second network device, that is, the UE can establish several radio links with the second network device. When the UE sends RLC uplink data to the second network device over a unidirectional radio channel (Radio Bearer, RB) established between the UE and the second network device, if the RLC uplink data is sent unsuccessfully, then the user equipment resends the RLC uplink data to the second network device the device by RB and counts the number of times (hereinafter referred to as the second number) of re-sending the uplink RLC data to the second network device from the UE by RB. When the second number of times reaches or exceeds the maximum number of retransmissions of RLC uplink data, it is determined that a failure occurs on the radio link carrying the RB between the UE and the second network device; otherwise, it is determined that no failure occurs on the radio link carrying the RB between the UE and the second network device.

[0098] It should be noted that the aforementioned maximum number of retransmissions of the random access preamble, the duration of the timer, and the maximum number of retransmissions of the uplink RLC data can be received by the first network device from the second network device and sent to the UE, or can be sent directly by the second network device to UE, which is described in detail in Embodiment 2 below and is not specified here.

[0099] It should be noted that the aforementioned first message may be a newly added message, in other words, a specially defined message; when the main base station receives this message, it can find out in accordance with the name of the message that a radio link failure occurs between the UE and the slave base station. In addition, the first message may also be an information element newly added to an existing message, or a specially defined information element; when the main base station receives the first message, it can find out, in accordance with whether the newly added information element is included in the first message, that a radio link failure occurs between the UE and the slave base station.

[0100] If necessary, the first message may carry an identifier associated with a communication failure, and the identifier associated with a communication failure may include one or more of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

[0101] Thus, the main base station, in accordance with the link failure identifier, may decide to free a resource associated with the slave base station and / or the UE so that the slave base station reallocates the resource to that UE as soon as possible, thereby further reducing interruption time of user data caused by a failure of the radio link, and improving user interaction for the user, which is described in detail in Embodiment 2 and is not specified here.

[0102] Of course, the first message may not carry the link failure identifier; in such a case, when a radio link failure occurs between the slave base station and the UE, the main base station in accordance with the first message can avoid unnecessary operations, such as restoring the SRB and re-activating security, and does not perform additional processing. Moreover, if only one slave base station provides a service for the UE, then the resource associated with the slave base station and / or the UE can also be freed in accordance with the first message.

[0103] If necessary, the first message may carry the cause of the failure of the communication line. Of course, the first message can only carry the identifier associated with the communication link failure or the cause of the communication failure, or it can carry both the identifier associated with the communication line failure and the reason for the communication failure. When the first message carries the cause of the failure of the communication line, the main base station can more accurately determine the cause of the failure, and therefore can eliminate the failure with minimal cost.

[0104] The above cause of a link failure may include: a random access problem, a number of retransmissions of a random access preamble reaching a maximum number of retransmissions of a random access preamble, a number of retransmissions of uplink RLC data reaching a maximum number of retransmissions of uplink data RLC communications, timer expiration, or reconfiguration failure.

[0105] In addition, the main base station may issue a command to the slave base station and / or UE to release the associated resource after determining in accordance with the first message that there is a failure on the radio link established between the UE and the slave base station so that the slave base station is you can quickly redistribute the resource to that UE, thereby reducing the time outage of user data caused by a radio link failure and improving user interaction for the user.

[0106] For example, as shown in FIG. 4, after the aforementioned step S302, the main base station sends a second message to the UE in accordance with the first message, the second message being used to instruct the user equipment to release a cell, SCG, Timing Advance Group, or TAG. In this case, the aforementioned method for processing a radio link failure may further include:

[0107] S303. Receive a second message sent by the first network device, the second message being used to instruct the UE to release a cell, SCG, TAG, or unidirectional channel.

[0108] S304. Release cell, SCG, TAG or unidirectional channel according to the second message.

[0109] In particular, in the above step S304, when the second message does not carry the release identifier, it can be considered that none of the radio links established between the UE and the second network device can be used in the usual manner, and the UE can release the SCG corresponding to the second network device. The operation in which the UE releases the SCG corresponding to the second network device may include a first to third case as follows:

[0110] In the first case, release the RB served by the SCG. If one RB is served only by SCG, then release the RB, that is, release the Packet Data Convergence Protocol (PDCP) object, the RLC object, and the logical channel that belong to the RB; if one RB is served by the MCG and SCG, then release the portion of the RB that is served by the SCG, that is, release the RLC entity and logical channel that correspond to the SCG in the RLC entities and logical channels that belong to the RB.

[0111] It should be noted that when one RB is served by only one SCG, one PDCP entity, one RLC entity, and one logical channel belong to the RB. The PDCP entity, RLC entity, and logical channel correspond to SCG. When one RB is served by MCG and SCG, one PDCP entity, two RLC entities, and two logical channels belong to RBs, wherein one RLC entity and one logical channel correspond to SCG, and the other RLC entity and the other logical channel correspond to MCG.

[0112] In the second case, release the Medium Access Control (MAC) object corresponding to the SCG.

[0113] It should be noted that the user equipment contains one MAC object corresponding to the MCG, and additionally contains one or more MAC objects, each of which corresponds to one SCG.

[0114] In the third case, release the cell included in the SCG.

[0115] After the UE releases the SCG corresponding to the second network device, the UE may further restore the radio link established between the UE and the cell included in the SCG corresponding to the second network device. Therefore, in comparison with the prior art, it is possible to begin to establish a radio communication line as quickly as possible, thereby further reducing the time outage of user data caused by a failure of the radio communication line, and improving user interaction for the user.

[0116] Furthermore, in the above step S304, when the second message carries the release identifier, a cell, SCG, TAG, or unidirectional channel is freed according to the release identifier.

[0117] For example, when the release identifier is a cell identifier, and the cell is a sub cell in the SCG, the cell is released; when the release identifier is the cell identifier and the cell is the main cell in the SCG, or when the release identifier is the SCG identifier, or when the release identifier is the identifiers of all cells included in the SCG, the SCG is released; when the release identifier is a TAG identifier, the TAG is released; when the release identifier is the cell identifier in the TAG, the cell included in the TAG is freed; or, when the release identifier is an identifier of a bearer channel served by the SCG, the bearer channel served by the SCG is freed.

[0118] Cells included in one TAG may be cells controlled by a single network device, or may be cells controlled by several network devices. Accordingly, a typical release operation of a cell included in a TAG may look as follows: When the cells included in the TAG are cells controlled by one network device, directly release all the cells included in the TAG. When the cells included in the TAG are cells controlled by several network devices, select a cell controlled by the second network device from the cells included in the TAG and release the selected cell.

[0119] A typical unidirectional channel release operation served by the SCG may look like this:

[0120] If the identifier of the bearer channel served by the SCG is the identifier of the RB, when RB is served only by the SCG, release the RB, that is, release the PDCP entity, the RLC entity, and the logical channel that are related to RB; when the RB is served by the MCG and SCG, then release the part of the unidirectional channel that is served by the SCG, that is, release the RLC entity and logical channel that correspond to the SCG in the RLC entities and logical channels that belong to the unidirectional channel.

[0121] If the identifier of the unidirectional channel served by the SCG is the identifier of the unidirectional radio access channel E-UTRAN (E-UTRAN Radio Access Bearer, E-RAB), then the user equipment in accordance with the identifier E-RAB obtains the identifier of the corresponding RB from the stored correspondence between RB identifier and E-RAB identifier. When the RB is served only by the SCG, the RB is freed, that is, the PDCP entity, the RLC entity, and the logical channel that relate to the RB are freed; when the RB is served by the MCG and SCG, the part of the unidirectional channel that is served by the SCG is freed, that is, the RLC entity and the logical channel that correspond to the SCG are freed in the RLC entities and logical channels that belong to the unidirectional channel.

[0122] In this embodiment of the present invention, when the user equipment detects that a radio link failure occurs between the user equipment and the slave base station, the user equipment sends a message to the main base station to notify the main base station that a radio link failure occurs between The UE and the slave base station, so that the main base station learns that a radio link failure occurs between the UE and the slave base station, and therefore you can no longer perform unnecessary operations, such as restoring the SRB and re-activating security. In addition, the main base station can also perform additional processing in the event of a radio link failure, for example, free up a resource associated with a slave base station and / or UE, so that the slave base station reallocates the resource to that UE as soon as possible, thereby effectively reducing user interruption time data caused by a radio link failure, and improving user experience for the user.

[0123] With reference to the following Embodiment 2, a process is described in which the main base station performs additional processing after it finds out that a radio link failure occurs between the UE and the slave base station.

Option 2 implementation

[0124] Referring to FIG. 5, FIG. 5 is a signaling flowchart of another method for processing a radio link failure in accordance with an embodiment of the present invention. The first network device is the main base station, and the second network device is the slave base station. As shown in FIG. 5, the method includes:

[0125] S501. The second network device sends the configuration parameter to the first network device, wherein the configuration parameter includes one or more of the following parameters: maximum number of retransmissions of the random access preamble, maximum number of retransmissions of uplink RLC data, and a timer duration.

[0126] The timer may be a timer T310.

[0127] S502. The first network device receives the configuration parameter sent by the second network device and sends the configuration parameter to the UE.

[0128] Since the first network device may generate a Radio Resource Control (RRC) message for the UE, the aforementioned configuration parameter may be transmitted using the RRC message, which is only an example here, and in the embodiment of the present invention, the message transmission format is not limited; or a configuration parameter may be transmitted using a different messaging process between the first network device and the second network device.

[0129] A configuration parameter sent by the first network device to the UE may carry all or some of the parameters in the configuration parameter sent by the second network device to the first network device, which is not limited in the embodiment of the present invention.

[0130] It should be noted that the above step S501 can be omitted. That is, the first network device can configure the configuration parameter sent to the UE without having to obtain the configuration parameter from the second network device. In addition, the first network device may instruct the second network device to send the aforementioned configuration parameter directly to the UE without having to send the configuration parameter through the first network device. In general, in this embodiment of the present invention, the source of the configuration parameter is not limited.

[0131] S503. The UE receives the configuration parameter sent by the first network device and, in accordance with the received configuration parameter, detects whether a failure occurs on the radio link established between the user equipment and the second network device, wherein the configuration parameter can carry one or more parameters of: maximum number of retransmissions random access preambles, the maximum number of retransmissions of the uplink data of the RLC and the duration of the timer, to the UE in accordance Corollary to any portable parameter and using the case according to the parameter, hereinafter - the first, second and third cases, may determine whether the failure occurs in the radio link established between the UE and the second network device.

[0132] Since the second network device can control several cells, the UE can establish a radio link with each of several cells controlled by the second network device, that is, the UE can establish several radio links with the second network device.

[0133] In the first case, when the received UE configuration parameter carries the maximum number of retransmissions of the random access preamble, when the UE sends a random access request to the second network device via a radio link established between the UE and the cell controlled by the second network device, if the random access request is sent fails, the UE resends the random access request to the second network device over the radio link and counts the first number of times, the first number p Az is equal to the number of times a resent random access request is sent to a second network device from the UE via a radio link. If the first number of times is greater than or equal to the maximum number of retransmissions of the random access preamble, then the UE determines that a failure occurs on the radio link; otherwise, the UE determines that a failure on the radio link does not occur.

[0134] In the second case, when the configuration parameter received by the UE carries a timer duration, when the UE detects that the quality of the downlink signal in the cell controlled by the second network device is less than or equal to a predetermined quality threshold, the UE starts the timer. If it is detected that the quality of the downlink signal in the cell does not exceed a predetermined quality threshold for the duration of the timer, that is, it is found that the quality of the downlink signal in the cell remains less than or equal to a predetermined quality threshold, then it is determined that failure on a radio link established between the UE and the cell. If it is detected that the signal quality of the downlink of the cell is greater than the predetermined quality threshold for the duration of the timer, then the timer stops and it is determined that there is no failure on the radio link established between the UE and the cell.

[0135] In the third case, when the received UE configuration parameter carries the maximum number of retransmissions of the uplink RLC data, when the UE sends the uplink RLC data to the second network device via a unidirectional radio channel (Radio Bearer, RB) established between the UE and the second network device, if the RLC uplink data is sent unsuccessfully, then the UE resends the RLC uplink data to the second network device by RB and counts a second number of times, the second number p It equals the number of times of resending the uplink RLC data to the second network device from UE by RB. If the second number of times is greater than or equal to the maximum number of retransmissions of the RLC uplink data, then it is determined that a failure occurs on the radio link carrying the RB between the UE and the second network device; otherwise, it is determined that no failure occurs on the radio link carrying the RB between the UE and the second network device.

[0136] If the configuration parameter carries more than one of: the maximum number of retransmissions of the random access preamble, the maximum number of retransmissions of the uplink RLC data and the duration of the timer, then in accordance with any parameter carried in the configuration parameter, and using the case corresponding parameter - the aforementioned first, second and third cases, it is possible to determine whether a failure occurs on the radio link established between the user equipment and the second network device.

[0137] The cause of the failure occurring on the radio link established between the UE and the second network device further includes: a random access problem and a reconfiguration failure. The random access problem may include the number of retransmissions of the random access preamble reaching the maximum number of retransmissions of the random access preamble. The case in which the reconfiguration failure occurs may look like this: When the first network device sends the configuration parameter to the UE, if the UE cannot accept the configuration parameter, the UE determines that a reconfiguration failure occurs and further determines that a failure occurs on the radio link installed between the UE and the second network device.

[0138] S504. When the UE detects that a failure occurs on a radio link established between the UE and the second network device, the UE sends a first message to the first network device, the first message being used to indicate that a failure occurs on the radio link established between the UE and the second network device.

[0139] In particular, if the UE detects that a failure occurs on a radio link established between the UE and the second network device, the UE may send a first message to the first network device on the radio link established between the UE and the first base station. Of course, the UE can also send the first message to the second network device over the radio link between the UE and the second network device, which does not fail, and the second network device receives the first message and redirects the first message to the first network device.

[0140] S505. The first network device receives the first message and, in accordance with the first message, determines that a failure occurs on the radio link established between the UE and the second network device.

[0141] The content of the first message is the same as described in Embodiment 1 above, for example, the first message may carry a link failure identifier and / or a link failure reason.

[0142] A link failure identifier may include any one or more of the following identifiers: the cell identifier of the cell corresponding to the radio link on which the failure occurs, the SCG identifier (Secondary Cell Group, to which the cell belongs, the corresponding radio link on which the failure occurs, the TAG identifier (Timing Advance Group, advance advancing group) to which the cell belongs, the corresponding radio link on which the failure occurs, and the unidirectional identifier ala corresponding radio link on which a fault occurs.

[0143] In an embodiment of the present invention, the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs is the identifier RB corresponding to the radio line on which the failure occurs, and the identifier RB corresponding to the radio link on which the failure occurs is the identifier RB served by the SCG to which the cell belongs, corresponding to the radio link on which the failure occurs.

[0144] The cause of the communication link failure can be any of the following: a random access problem, the number of retransmissions of the random access preamble reaching or exceeding the maximum number of retransmissions of the random access preamble, the number of retransmissions of RLC uplink data reaching or exceeding the maximum number retransmissions of RLC uplink data, end of timer, and reconfiguration failure.

[0145] Furthermore, upon receiving the cause of the communication line failure, the first network device may take appropriate measures in accordance with the communication line failure reason to avoid the failure of the radio communication line again due to the communication line failure. For example, if the cause of the link failure is the number of retransmissions of the RLC uplink data reaching the maximum number of retransmissions of the RLC uplink data, and the reason that the number of retransmissions of the RLC uplink data reaches the maximum number of retransmissions of the RLC uplink data RLC, is that the second number of retransmissions is not set correctly, then the first network device can adjust the maximum number of retransmissions RLC uplink data to avoid a failure once again on the radio link established between the UE and the second network device because the maximum number of retransmissions of the RLC uplink data is not set correctly.

[0146] For example, when the cause of the link failure is the random access problem, that is, the number of retransmissions of the random access preamble reaching the maximum number of retransmissions of the random access preamble, if the reason that the number of retransmissions of the random access preamble reaches the maximum number of retransmissions of the preamble random access, is that the maximum number of retransmissions of the random access preamble is set incorrectly, t first network device may adjust the maximum number of retransmissions of the random access preamble, to avoid the occurrence of a fault again at a radio link established between the UE and the second network device, because the maximum number of retransmissions of the random access preamble is set correctly. If the number of retransmissions of the random access preamble reaches the maximum number of retransmissions of the random access preamble due to the relatively large distance between the UE and the second network device, the first network device can further assist the operator in deploying a new second network device near the UE in order to reduce the distance between the UE and a second network device, thereby preventing that a failure again occurs on a radio link established between the UE and the second network device, because of the relatively large distance between the UE and the second network device.

[0147] For example, when the cause of the communication line failure is the end of the timer, if the timer ends because the timer duration is not set correctly, then the first network device can adjust the timer duration to avoid a failure again on the radio link established between the UE and the second network device because the timer duration is not set correctly. If the timer ends because the transmission power on the downlink of the second network device is relatively low, then the first network device can help the operator increase the transmission power on the downlink of the second network device, thereby preventing the radio link from failing again. installed between the UE and the second network device because the transmission power on the downlink of the second network device is relatively low.

[0148] S506. The first network device sends a second message to the UE in accordance with the first message, the second message being used to instruct the UE to release a cell, SCG, TAG, or unidirectional channel.

[0149] In particular, this step can be implemented as follows through steps (1) to (3), which include:

[0150] (1). The first network device determines the SCG identifier that owns the cell corresponding to the radio link on which the failure occurs, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG as the first release identifier, if the first message does not carry a link failure identifier.

[0151] In particular, if the first message does not carry the link failure identifier, the first network device determines that a failure occurs on all radio links established between the UE and the second network device, and the first network device receives the SCG identifier to which the cell corresponding to the radio link on which the failure occurs, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG, and determines the SCG identifier that owns the cell corresponding to the radio link on which the failure occurs, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG as the first release identifier.

[0152] The bearer identifier served by the SCG may be an RB identifier or may be an E-RAB identifier. Preferably, the bearer identifier served by the SCG is an RB identifier.

[0153] A typical operation for obtaining a cell identifier included in the SCG may be as follows: The first network device obtains the identifier of the corresponding cell from the stored correspondence between the SCG identifier and the cell identifier in accordance with the SCG identifier that owns the cell corresponding to the radio link on which a failure occurs and determines the received cell identifier as the identifier of the cell included in the SCG.

[0154] Each SCG includes one main cell, and each SCG may not include a sub cell or include one or more sub cells. When a failure occurs on a radio link established between the UE and the main cell included in the SCG, the UE cannot transmit data with a second network device over the radio link established between the UE and the slave cell also included in the SCG.

[0155] Each SCG may serve one or more RBs, and one RB may be served by the MCG and one or more SCGs, or may be served by only one SCG.

[0156] (2). The first network device determines the first release identifier in accordance with the link failure identifier if the first message carries the link failure identifier.

[0157] A typical operation of determining a first release identifier by a first network device in accordance with a link failure identifier may be as follows: Define a cell identifier as a first release identifier if the link failure identifier is an identifier of a cell corresponding to a radio link, on which a failure occurs; determine the SCG identifier, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG as the first release identifier, if the identifier associated with the link failure is the identifier of the SCG to which the cell corresponding to the line belongs radio communication on which the failure occurs; determine the TAG identifier or the identifier of the cell included in the TAG as the first release identifier, if the identifier associated with the link failure is the identifier TAG, which belongs to the cell corresponding to the radio link on which the failure occurs; or determine the identifier of the SCG serving the unidirectional channel, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG as the first release identifier, if the identifier associated with the link failure is the identifier of the unidirectional channel, corresponding radio link on which the failure occurs.

[0158] (3). The first network device sends a second message to the UE, the second message carrying the first release identifier.

[0159] If necessary, if the first message does not carry the identifier associated with the communication link failure, the first network device can directly send the second message to the UE, the second message also not transferring the first release identifier.

[0160] S507. The first network device sends a third message to the second network device in accordance with the first message, the third message being used to instruct the second network device to release a resource used to service the UE.

[0161] In particular, if the first message does not carry the identifier associated with the communication link failure, then the UE identifier is determined as the second release identifier; or the second release identifier is determined in accordance with the link failure identifier if the first message carries the link failure identifier and the third message is sent to the second network device, the third message transferring the second release identifier.

[0162] An exemplary operation for determining a second release identifier in accordance with a link failure identifier may be as follows: Define a UE identifier and a cell identifier as a second release identifier if the link failure identifier is an identifier of a cell corresponding to a radio link, on which a failure occurs; determine the UE identifier as the second release identifier if the identifier associated with the communication link failure is the identifier of the SCG to which the cell belongs, corresponding to the communication line on which the failure occurs; determine the UE identifier and the TAG identifier as the second release identifier, or determine the UE identifier and the cell identifier included in the TAG as the second release identifier, if the link failure identifier is the TAG identifier that owns the cell corresponding to the radio link on which a failure occurs; or determine the UE identifier as the second release identifier, or determine the UE identifier and the unidirectional channel identifier served by the SCG serving the unidirectional channel as the second release identifier if the link failure identifier is an unidirectional channel identifier corresponding to the radio link on which failure occurs.

[0163] Since the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs is the identifier RB, the identifier of the unidirectional channel served by the SCG serving the RB may be an RB identifier or may be an E-UTRAN Radio Access Bearer, unidirectional radio access channel E-UTRAN) corresponding to RB. The E-RAB identifier is the identifier of the E-RAB corresponding to RB; the first network device can obtain the identifier of the corresponding E-RAB from the stored correspondence between the identifier of the RB and the identifier of the E-RAB in accordance with the identifier of the RB and determine the received identifier of the E-RAB as the identifier of the E-RAB corresponding to the RB.

[0164] S508. The UE receives a second message sent by the first network device, the second message being used to instruct the UE to release a cell, a group of subordinate SCG cells, a TAG timing group, or a unidirectional channel; and frees the cell, SCG, TAG or unidirectional channel in accordance with the second message.

[0165] In particular, if the second message does not carry the first release identifier, then the UE releases the SCG corresponding to the second network device.

[0166] If the second message does not carry the first release identifier, then it is determined that none of the radio links established between the UE and the second network device can be used in the usual manner, and the UE releases the SCG corresponding to the second network device.

[0167] The characteristic SCG release operation corresponding to the second network device by the UE is the same as that described in the aforementioned Embodiment 1 and is no longer specified here. If the second message carries the first release identifier, then the UE releases the cell, SCG, TAG, or unidirectional channel in accordance with the first release identifier.

[0168] An exemplary operation to release a cell, SCG, TAG, or unidirectional channel according to the first release identifier may look like this: Release the cell if the first release identifier is the cell identifier and the cell is a slave cell included in the SCG; release the SCG if the first release identifier is the cell identifier and the cell is the main cell included in the SCG, the first release identifier is the SCG identifier, or the first release identifier is the identifiers of all cells included in the SCG; release the TAG if the first release identifier is a TAG identifier; release the cell included in the TAG if the first release identifier is the identifier of the cell included in the TAG; or release the unidirectional channel served by the SCG, if the first release identifier is the identifier of the unidirectional channel served by the SCG.

[0169] Cells included in one TAG may be cells controlled by one network device, or may be cells controlled by several network devices. Accordingly, a typical release operation of a cell included in a TAG may look as follows: When the cells included in the TAG are cells controlled by one network device, directly release all the cells included in the TAG. When the cells included in the TAG are cells controlled by several network devices, select a cell controlled by the second network device from the cells included in the TAG and release the selected cell.

[0170] A typical unidirectional channel release operation served by the SCG may look like this:

[0171] If the identifier of the bearer channel served by the SCG is the identifier of the RB, when RB is served only by the SCG, release the RB, that is, release the PDCP entity, the RLC entity, and the logical channel that are related to RB; when the RB is served by the MCG and SCG, then release the part of the unidirectional channel that is served by the SCG, that is, release the RLC entity and logical channel that correspond to the SCG in the RLC entities and logical channels that belong to the unidirectional channel.

[0172] If the identifier of the bearer channel served by the SCG is an E-RAB identifier, then the user equipment according to the E-RAB identifier obtains the identifier of the corresponding RB from the stored correspondence between the identifier RB and the identifier E-RAB. When the RB is served only by the SCG, release the RB, that is, release the PDCP entity, the RLC entity, and the logical channel that belong to the RB. When the RB is served by the MCG and SCG, then release the part of the unidirectional channel that is served by the SCG, that is, release the RLC entity and logical channel that correspond to the SCG in the RLC entities and logical channels that belong to the unidirectional channel.

[0173] S509. The second network device receives a third message sent by the first network device, the third message being used to instruct the second network device to release a resource used to service the UE; and in accordance with the command message, releases the resource used to service the UE.

[0174] The third message may carry the second release identifier, and the resource used to service the UE is released in accordance with the second release identifier.

[0175] In particular, the second network device receives the third message. If the second release identifier is the UE identifier, then the resource used to service the UE is freed; if the second release identifier is the UE identifier and the cell identifier, then the cell resource used to service the UE is freed; if the second release identifier is a UE identifier and a TAG identifier, then the TAG resource used to service the UE is released; if the second release identifier is the UE identifier and the identifier of the cell included in the TAG, then the resource of the cell included in the TAG used to service the UE is freed; or a resource used to service a unidirectional channel at a UE is released if the second release identifier is an UE identifier and an unidirectional channel identifier served by an SCG serving a unidirectional channel.

[0176] Cells included in one TAG may be cells controlled by one network device, or may be cells controlled by multiple network devices. Accordingly, a typical operation of releasing the resource of a cell included in a TAG may look as follows: When the cells included in the TAG are cells controlled by one network device, directly free the resources of all cells included in the TAG. When the cells included in the TAG are cells controlled by several network devices, select a cell controlled by the second network device from the cells included in the TAG and free the resource of the selected cell.

[0177] A typical operation of releasing a resource used to service a unidirectional channel at a UE may be as follows: If the identifier of the unidirectional channel served by the SCG serving the unidirectional channel is an RB identifier, then, in accordance with the RB identifier, obtain the identifier of the corresponding E-RAB from stored correspondence between the RB identifier and the E-RAB identifier and release the resource used to service the E-RAB of the UE. If the unidirectional channel identifier served by the SCG serving the unidirectional channel is an E-RAB identifier, then directly release the resource used to service the E-RAB of the UE.

[0178] In this embodiment of the present invention, the first network device may issue a command to free a resource only to the UE or the second network device, or may issue a command to free the resource of both the UE and the second network device. That is, the first network device can send only the second message or the third message, or it can simultaneously (or asynchronously) send the second message and the third message to instruct the UE and / or the second network device to release the associated resource and configuration, which is not limited in this embodiment the implementation of the present invention.

[0179] In this embodiment of the present invention, when the user equipment detects that a radio link failure occurs between the user equipment and the slave base station, the user equipment sends a message to the main base station to notify the main base station that a radio link failure occurs between The UE and the slave base station, so that the main base station learns that a radio link failure occurs between the UE and the slave base station, and therefore you can no longer perform unnecessary operations, such as restoring the SRB and re-activating security. In addition, the main base station can also perform additional processing in the event of a radio link failure, for example, free up a resource associated with a slave base station and / or UE, so that the slave base station reallocates the resource to that UE as soon as possible, thereby effectively reducing user interruption time data caused by a radio link failure, and improving user experience for the user.

Option 3 implementation

[0180] In this embodiment, when the slave base station detects that a radio link failure occurs between the slave base station and the UE, the slave base station sends a message to the main base station to notify the main base station that a radio link failure occurs between the UE and slave base station. Referring to FIG. 6, FIG. 6 is a flowchart of a method for processing a radio link failure in accordance with this embodiment of the present invention. As shown in FIG. 6, the method includes:

[0181] S601. The second network device detects whether a radio link failure occurs between the UE and the second network device, i.e., the second network device detects whether a failure occurs on the radio link established between the UE and the second network device. When radio links are established between the UE and several cells of the second network device, it can be specified that a radio link failure occurs between the UE and the second network device (that is, a failure occurs on the radio link established between the UE and the second network device) when failure occurs on any radio lines; or you can specify that a radio link failure occurs between the UE and the second network device (that is, a failure occurs on the radio link established between the UE and the second network device) when a failure occurs on the radio link or some radio links.

[0182] S602. Forward the first message to the first network device when it is detected that a radio link failure occurs between the UE and the second network device, the first message being used to indicate that a radio link failure occurs between the user equipment and the second network device. That is, the first message is forwarded to the first network device when it is detected that a failure occurs on a radio link established between the UE and the second network device, the first message being used to indicate that a failure occurs on a radio link established between the UE and the second network device; in other words, the first message is used to indicate that a radio link failure occurs between the user equipment and the second network device.

[0183] The aforementioned first network device relates to a primary base station, and a second network device relates to a secondary base station. When the slave base station detects that a radio link failure occurs between the slave base station and the UE, the slave base station can report a radio link failure of the main base station, so that the main base station recognizes that a radio link failure occurs between the UE and the slave base station, and therefore, you can no longer perform unnecessary operations, such as restoring the SRB and re-activating security. In addition, the main base station can also perform additional processing in the event of a radio link failure, for example, free up a resource associated with a slave base station and / or UE, so that the slave base station reallocates the resource to that UE as soon as possible, thereby effectively reducing user interruption time data caused by a radio link failure, and improving user experience for the user.

[0184] The aforementioned step S601, that is, the step in which the second network device detects whether a failure occurs on the radio link established between the UE and the second network device, can be implemented in the following forms:

[0185] In a first view, it is detected that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the number of attempts to receive the random access request sent by the user equipment by the second network device on the first radio link reaches or exceeds the maximum the number of attempts to receive a random access request, the first radio link being any radio link established between the user equipment and a second network device.

[0186] When the second network device attempts to receive a random access request in the current period, which is sent to the second network device from the UE via a radio link established between the UE and the cell controlled by the second network device, if the second network device does not accept the random access request, then the second the network device again attempts to receive a random access request in the next period, which is sent to the second network device from the UE via a radio link, and counts a third number of times, for example than the third number of times equal to the number of attempts to take the second network device of the random access request, which is sent from the second network device UE on the radio link. If the third number of times is greater than or equal to the maximum number of attempts to accept a random access request, the second network device determines that a failure occurs on the radio link; otherwise, the second network device determines that there is no failure on the radio link.

[0187] In a second view, it is determined that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that sending information of the physical downlink control channel PDCCH by the second network device to the user equipment on the first radio link reaches or exceeds the maximum the number of PDCCH retransmissions, the first radio link being any radio link established between the user equipment and watts ring network device.

[0188] When the second network device sends PDCCH information to the UE via a radio link established between the second network device and the UE, if the PDCCH information is unsuccessful, then the second network device resends the PDCCH information to the UE via the radio link and counts a fourth number of times, moreover the fourth number of times is equal to the number of times the PDCCH information is resent to the UE by the second network device over the radio link. If the fourth number of times is greater than or equal to the maximum number of retransmissions of the PDCCH, it is determined that a failure occurs on the radio link between the UE and the second network device; otherwise, it is determined that there is no failure on the radio link between the UE and the second network device.

[0189] In a third form, it is determined that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of the downlink data for controlling the RLC of the second network device on the first unidirectional radio channel reaches or exceeds the maximum the number of retransmissions of RLC downlink data, the first unidirectional radio channel being any unidirectional radio channel through which th second network device serving a user equipment and which is carried on one or more radio links established between the user equipment and the second network device.

[0190] When the second network device sends RLC downlink data to the UE via RB carried by the radio link established between the second network device and the UE, if the RLC downlink data is unsuccessful, then the second network device resends the RLC downlink data to the UE by RB and counts the fifth number of times, and the fifth number of times equal to the number of times of resending RLC downlink data to the UE by the second network device on RB. If the fifth number is greater than or equal to the maximum number of retransmissions of RLC downlink data, then it is determined that a failure occurs on the radio link carrying the RB between the UE and the second network device; otherwise, it is determined that no failure occurs on the radio link carrying the RB between the UE and the second network device.

[0191] In a fourth form, it is determined that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that the frequency of the error blocks of the uplink data that is sent by the user equipment and received on the first radio link by the second network device is greater than or equal to a predetermined frequency of blocks with errors, and the first radio link is any radio link established between the user equipment and a second network device.

[0192] If the second network device receives, via a radio link established between the cell controlled by the second network device, and the UE, uplink data sent to the second network device from the UE, then the second network device calculates the error rate of the received uplink data and compares the calculated block frequency with errors and the predefined block frequency with errors. If the calculated frequency of the error blocks is greater than or equal to the predefined frequency of the error blocks, then it is determined that a failure occurs on the radio link established between the UE and the cell; otherwise, it is determined that no failure occurs on the radio link established between the UE and the cell. Alternatively, if the second network device receives uplink data sent from the second network device from the UE via the RB carried between the cell controlled by the second network device and the UE, then the second network device calculates the error rate of the received data blocks uplink and compares the calculated block frequency with errors and the predefined block frequency with errors. If the calculated frequency of the error blocks is greater than or equal to the predefined frequency of the error blocks, then it is determined that a failure occurs on the radio link carrying RB; otherwise, it is determined that no failure occurs on the radio link carrying the RB.

[0193] In a fifth form, it is determined that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that the frequency of occurrence of erroneous bits in the uplink data sent by the user equipment and received on the first radio link by the second network device greater than or equal to a predetermined frequency of occurrence of erroneous discharges, and the first radio link is any radio link established between The User equipment and the second network device.

[0194] If the second network device receives, on a radio link established between the cell controlled by the second network device and the UE, uplink data sent to the second network device from the UE, then the second network device calculates the frequency of occurrence of erroneous bits in the received uplink data and compares the calculated frequency of occurrence of erroneous bits and the predefined frequency of occurrence of erroneous bits. If the calculated frequency of occurrence of erroneous discharges is greater than or equal to a predetermined frequency of occurrence of erroneous discharges, then it is determined that a failure occurs on the radio link established between the UE and the cell; otherwise, it is determined that no failure occurs on the radio link established between the UE and the cell. If the second network device receives the uplink data sent to the second network device from the UE by the RB carried by the radio link established between the cell and the UE controlled by the second network device, then the second network device calculates the frequency of occurrence of erroneous bits in the received uplink data and compares the calculated frequency of occurrence of erroneous bits and the predefined frequency of occurrence of erroneous bits. If the calculated frequency of occurrence of erroneous discharges is greater than or equal to a predetermined frequency of occurrence of erroneous discharges, it is determined that a failure occurs on the radio link carrying RB; otherwise, it is determined that no failure occurs on the radio link carrying the RB.

[0195] It should be noted that the aforementioned maximum number of attempts to receive a random access request, the maximum number of retransmissions of a PDCCH, the maximum number of retransmissions of RLC downlink data, a predetermined error rate of blocks with errors, and a predetermined error rate of occurrence of bits can be preset in the second network device or can be configured for the second network device by the first network device, which is described in detail in Varia 4 those of the lower and here not specified.

[0196] It should be noted that the aforementioned first message may be a newly added message, in other words, a specially defined message; when the main base station receives this message, it can find out in accordance with the name of the message that a radio link failure occurs between the UE and the slave base station. In addition, the first message may also be an information element newly added to an existing message, or a specially defined information element; when the main base station receives the first message, it can find out, in accordance with whether the newly added information element is included in the first message, that a radio link failure occurs between the UE and the slave base station.

[0197] If necessary, the first message may carry the UE identifier and the identifier associated with the communication failure, and the identifier associated with the communication failure may include one or more of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

[0198] Thus, the main base station, in accordance with the link failure identifier, may decide to free a resource associated with the slave base station and / or the UE so that the slave base station reallocates the resource to that UE as soon as possible, thereby further reducing interruption time of user data caused by a failure of the radio link, and improving user interaction for the user, which is described in detail in Embodiment 4 and is not specified here.

[0199] Of course, the first message may not carry the link failure identifier. In such a case, when a radio link failure occurs between the slave base station and the UE, the main base station in accordance with the first message can avoid unnecessary operations, such as restoring the SRB and re-activating security, and does not perform additional processing. Moreover, if only one slave base station provides a service for the UE, then the resource associated with the slave base station and / or the UE can also be freed in accordance with the first message.

[0200] If necessary, the first message may carry the cause of the link failure. Of course, the first message can only carry the identifier associated with the communication link failure or the cause of the communication failure, or it can carry both the identifier associated with the communication line failure and the reason for the communication failure. When the first message carries the cause of the failure of the communication line, the main base station can more accurately determine the cause of the failure, and therefore can eliminate the failure with minimal cost.

[0201] The above cause of a link failure may include: a random access problem, a number of times a random access request has been received reaching or exceeding a maximum number of attempts to receive a random access request, a number of PDCCH retransmissions reaching or exceeding a maximum number of PDCCH retransmissions, number retransmissions of RLC downlink data reaching or exceeding the maximum number of retransmissions of RLC downlink data, frequency b locks with errors in the data of the uplink, reaching or exceeding a predetermined frequency of blocks with errors, the frequency of occurrence of erroneous bits in the data of the uplink of communications, reaching or exceeding the predefined frequency of occurrence of erroneous bits, the problem of reception on the uplink or the problem of sending on the downlink communication lines.

[0202] In addition, the main base station may issue a command to the slave base station and / or UE to release the associated resource after determining in accordance with the first message that a failure occurs on a radio link established between the UE and the slave base station so that the slave base station is you can quickly redistribute the resource to that UE, thereby reducing the time outage of user data caused by a radio link failure and improving user interaction for the user.

[0203] For example, as shown in FIG. 7, after the aforementioned step S602, the main base station sends a second message to the slave base station in accordance with the first message, the second message being used to instruct the slave base station to release the resource used to service the UE. In this case, the aforementioned method for processing a radio link failure may further include:

[0204] S603. The second network device receives a third message sent by the first network device, the third message being used to instruct the second network device to release a resource used to service the UE.

[0205] S604. Release the resource used to service the UE in accordance with the third message.

[0206] In particular, in the aforementioned step S604, the resource used to service the UE is freed when the third message includes the identifier of the UE; or a cell resource used to service the UE is released when the third message includes a UE identifier and a cell identifier; or the TAG resource used to service the UE is released when the third message includes a UE identifier and a TAG identifier; or the resource of the cell included in the TAG used to service the user equipment is freed when the third message includes a UE identifier and a cell identifier in the TAG; or the resource used to service the unidirectional channel of the user equipment is released when the third message includes the identifier of the user equipment and the identifier of the unidirectional channel.

[0207] Cells included in one TAG may be cells controlled by one network device, or may be cells controlled by several network devices. Accordingly, a typical operation of releasing the resource of a cell included in a TAG may look as follows: When the cells included in the TAG are cells controlled by one network device, directly free the resources of all cells included in the TAG. When the cells included in the TAG are cells controlled by several network devices, select a cell controlled by the second network device from the cells included in the TAG and free the resource of the selected cell.

[0208] A typical operation of releasing a resource used to service a unidirectional channel at a UE may be as follows: If the identifier of the unidirectional channel served by the SCG serving the unidirectional channel is an RB identifier, then, in accordance with the RB identifier, obtain the identifier of the corresponding E-RAB from stored correspondence between the RB identifier and the E-RAB identifier and release the resource used to service the E-RAB of the UE. If the unidirectional channel identifier served by the SCG serving the unidirectional channel is an E-RAB identifier, then directly release the resource used to service the E-RAB of the UE.

[0209] In this embodiment of the present invention, when the slave base station detects that a radio link failure occurs between the slave base station and the UE, the slave base station sends a message to the main base station to notify the main base station that a radio link failure is occurring. between the UE and the slave base station, so that the main base station recognizes that a radio link failure occurs between the UE and the slave base station, and therefore unnecessary op walkie-talkie, such as SRB recovery and re-activation of security. In addition, the main base station can perform additional processing in the event of a radio link failure, for example, free up a resource associated with a slave base station and / or UE, so that the slave base station reallocates the resource to that UE as soon as possible, thereby effectively reducing the time outage of user data caused by a radio link failure, and improving user experience for the user.

[0210] With reference to the following Embodiment 4, a process is described in which the main base station performs additional processing after it finds out that a radio link failure occurs between the UE and the slave base station.

Option 4 implementation

[0211] Referring to FIG. 8, FIG. 8 is a signaling flowchart of another method for processing a radio link failure in accordance with an embodiment of the present invention. As shown in FIG. 8, the method includes:

[0212] S801. The first network device sends the configuration parameter to the second network device, the configuration parameter transferring one or more of the following parameters: the maximum number of attempts to receive a random access request, the maximum number of retransmissions of the PDCCH, the maximum number of retransmissions of the RLC downlink data, the threshold value of the block frequency with errors (Block Error Rate, BLER) for uplink data (or called a predefined block frequency with errors) and the threshold led the origin of the error rate (Bit Error Rate, BER) of the uplink data (or called the predefined error rate).

[0213] S802. The second network device receives the configuration parameter and, in accordance with the received configuration parameter, detects whether a failure occurs on the radio link established between the second network device and the UE.

[0214] Since the second network device can control several cells, the UE can establish a radio link with each of several cells controlled by the second network device, that is, the UE can establish several radio links with the second network device.

[0215] In the first case, after the second network device receives the configuration parameter, if the configuration parameter tolerates the maximum number of attempts to receive a random access request, when the second network device attempts to receive a random access request in the current period, which is sent to the second network device from the UE via a radio link established between the UE and the cell controlled by the second network device, if the second network device does not accept the random access request, then the second network the device again tries to receive in the next period a random access request, which is sent to the second network device from the UE via the radio link, and counts a third number of times, and the third number of times is equal to the number of attempts to receive the second network device the random access request, which is sent to the second network device from the UE by radio link. If the third number of times is greater than or equal to the maximum number of attempts to accept a random access request, the second network device determines that a failure occurs on the radio link; otherwise, the second network device determines that there is no failure on the radio link.

[0216] In the second case, if the configuration parameter carries the maximum number of PDCCH retransmissions, when the second network device sends PDCCH information to the UE via the radio link established between the second network device and the UE, if the PDCCH information is sent unsuccessfully, then the second network device resends the PDCCH information to the UE via the radio link and counts a fourth number of times, the fourth number of times equal to the number of times the PDCCH information is resent to the UE by the second network device on the pa interconnection. If the fourth number of times is greater than or equal to the maximum number of retransmissions of the PDCCH, it is determined that a failure occurs on the radio link between the UE and the second network device; otherwise, it is determined that there is no failure on the radio link between the UE and the second network device.

[0217] In the third case, if the configuration parameter carries the maximum number of retransmissions of RLC downlink data when the second network device sends RLC downlink data to the UE via RB carried by the radio link established between the second network device and the UE, if the data the RLC downlink is sent unsuccessfully, then the second network device resends the RLC downlink data to the UE by RB and counts the fifth number of times, the fifth number of times equal to the number of times To Re-sending downlink data to the UE RLC second network device by RB. If the fifth number is greater than or equal to the maximum number of retransmissions of RLC downlink data, then it is determined that a failure occurs on the radio link carrying the RB between the UE and the second network device; otherwise, it is determined that no failure occurs on the radio link carrying the RB between the UE and the second network device.

[0218] In the fourth case, if the configuration parameter carries a predetermined block frequency with errors, and if the second network device receives, via a radio link established between the cell controlled by the second network device and the UE, uplink data sent to the second network device from the UE, then the second network device calculates the block frequency with the errors of the received uplink data and compares the calculated block frequency with the errors and the predetermined block frequency with the errors. If the calculated frequency of the error blocks is greater than or equal to the predefined frequency of the error blocks, then it is determined that a failure occurs on the radio link established between the UE and the cell; otherwise, it is determined that no failure occurs on the radio link established between the UE and the cell. If the second network device receives the uplink data sent to the second network device from the UE by the RB carried by the radio link established between the cell controlled by the second network device and the UE, then the second network device calculates the error rate of the received uplink data and compares the calculated block frequency with errors and the predefined block frequency with errors. If the calculated frequency of the error blocks is greater than or equal to the predefined frequency of the error blocks, then it is determined that a failure occurs on the radio link carrying RB; otherwise, it is determined that no failure occurs on the radio link carrying the RB.

[0219] In the fifth case, if the configuration parameter carries a predetermined frequency of occurrence of erroneous bits, and if the second network device receives via a radio link established between the cell controlled by the second network device and the UE, uplink data sent to the second network device from the UE, then the second network device calculates the frequency of occurrence of erroneous bits of the received data uplink communication and compares the calculated frequency of occurrence of erroneous bits and a predetermined time signature occurrence of erroneous discharge. If the calculated frequency of occurrence of erroneous discharges is greater than or equal to a predetermined frequency of occurrence of erroneous discharges, then it is determined that a failure occurs on the radio link established between the UE and the cell; otherwise, it is determined that no failure occurs on the radio link established between the UE and the cell. If the second network device receives the uplink data sent to the second network device from the UE by the RB carried by the radio link established between the cell and the UE controlled by the second network device, then the second network device calculates the frequency of occurrence of erroneous bits in the received uplink data and compares the calculated frequency of occurrence of erroneous bits and the predefined frequency of occurrence of erroneous bits. If the calculated frequency of occurrence of erroneous discharges is greater than or equal to a predetermined frequency of occurrence of erroneous discharges, it is determined that a failure occurs on the radio link carrying RB; otherwise, it is determined that no failure occurs on the radio link carrying the RB.

[0220] If the configuration parameter carries more than one of: a maximum number of attempts to receive a random access request, a maximum number of retransmissions of a PDCCH, a maximum number of retransmissions of RLC downlink data, a predetermined frequency of errored blocks and a predetermined frequency of occurrence of erroneous bits, then in accordance with any parameter and using the case corresponding to the parameter - the aforementioned cases one through five, it can be determined whether a kaz on a radio link established between the UE and the second network device.

[0221] The cause of the failure occurring on the radio link established between the UE and the second network device further includes: an uplink reception problem and a downlink sending problem. The reception problem on the uplink includes the number of times a random access request is received, reaching or exceeding the maximum number of attempts to receive a random access request, uplink BLER data reaching or exceeding a predetermined error rate, and uplink data BER, reaching or exceeding a predetermined frequency of occurrence of erroneous discharges. The downlink sending problem includes the number of PDCCH retransmissions reaching or exceeding the maximum number of PDCCH retransmissions, and the number of RLC downlink data retransmissions reaching or exceeding the maximum number of RLC downlink retransmissions.

[0222] If necessary, the first network device may not send a configuration parameter to the second network device, but instead, the second network device configures one or more of: a maximum number of attempts to receive a random access request, a maximum number of PDCCH retransmissions, a maximum number of downlink data retransmissions RLC communication, a predetermined frequency of errored blocks and a predetermined frequency of occurrence of erroneous bits. The second network device, in accordance with the aforementioned parameter configured by the second network device, detects a radio link established between the second network device and the UE.

[0223] S803. When the second network device detects that a failure occurs on a radio link established between the second network device and the UE, the second network device sends a first message to the first network device, the first message being used to indicate that a failure occurs on the radio link established between the UE and the second network device.

[0224] In particular, if the second network device detects that a failure occurs on a radio link established between the second network device and the UE, then the second network device can send the first message to the first network device via a wired communication line established between the second network device and the first network device; of course, the second network device may send the first message to the first network device in a wireless manner, which is not limited in this embodiment of the present invention.

[0225] S804. The first network device receives the first message and, in accordance with the first message, determines that a failure occurs on the radio link established between the UE and the second network device.

[0226] The content of the first message is the same as described in Embodiment 3 above, for example, the first message may carry the UE identifier and the identifier associated with the communication failure and / or the reason for the communication failure.

[0227] A link failure identifier may include any one or more of the following identifiers: the identifier of the cell corresponding to the radio link on which the failure occurs, the SCG identifier to which the cell belongs, the corresponding radio link on which the failure occurs, the TAG identifier which owns the cell corresponding to the radio link on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

[0228] In this embodiment of the present invention, the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs may be the identifier of the E-RAB corresponding to the radio line on which the failure occurs.

[0229] The cause of the link failure can be any of the following reasons: a random access problem, the number of times a random access request is received, reaching or exceeding the maximum number of attempts to receive a random access request, the number of PDCCH retransmissions, reaching or exceeding the maximum number of PDCCH retransmissions, the number of retransmissions of RLC downlink data reaching or exceeding the maximum number of retransmissions of RLC downlink data, BLER data uplink, reaching or exceeding a predetermined block error rate, BER uplink data reaches or exceeds a predetermined error rate of bits, the problem of reception on the uplink and the problem send downlink. In addition, upon receiving the cause of the link failure, the first network device may take appropriate measures in accordance with the cause of the link failure in order to avoid the failure of the radio link again due to the link failure. For example, when the cause of a communication link failure is the number of times a random access request is received that reaches the maximum number of attempts to accept a random access request, and the reason that the number of times a random access request is received reaches the maximum number of attempts to receive a random access request is that the maximum number Attempts to accept a random access request are set incorrectly, the first network device can adjust the maximum number of attempts to accept random access request in order to avoid a failure once again on the radio link established between the UE and the second network device, because the maximum number of attempts to receive the random access request is set incorrectly. If the reason that the number of times a random access request is received reaches the maximum number of attempts to accept a random access request is because the distance between the UE and the second network device is relatively large, then the first network device can further assist the operator in deploying a new second network device near the UE in order to reduce the distance between the UE and the second network device, thereby preventing that a failure again occurs on the radio link established between the UE and torym network device, due to the distance between the UE and the second network device.

[0230] For example, when the cause of the link failure is the number of PDCCH retransmissions reaching the maximum number of PDCCH retransmissions, and the reason that the number of PDCCH retransmissions reaches the maximum number of PDCCH retransmissions is that the maximum number of PDCCH retransmissions is set incorrectly , the first network device may adjust the maximum number of PDCCH retransmissions to avoid failure once again on the radio link established between the UE and the second set th device, because the maximum number of retransmissions PDCCH is set incorrectly.

[0231] For example, when the cause of the link failure is the number of retransmissions of the RLC downlink data reaching the maximum number of retransmissions of the RLC downlink data, and the reason that the number of retransmissions of the RLC downlink data reaches the maximum number of retransmissions of RLC data RLC downlink, is that the maximum number of retransmissions of RLC downlink data is not set correctly, the first network device can adjust ksimalnoe number of retransmissions of the downlink RLC data connection, to avoid the occurrence of a fault again at a radio link established between the UE and the second network device, because the maximum number of retransmissions of downlink RLC data specified incorrectly.

[0232] For example, when the cause of the link failure is the uplink data BLER exceeding the predetermined error rate of the blocks, and the reason that the uplink data BLER is higher than the preset error rate of the blocks is because the predetermined frequency blocks with errors is set incorrectly, the first network device can adjust the predefined frequency of blocks with errors in order to avoid failure once again on the radio link established between The UE and the second network device, because the predefined frequency of the errored blocks is not set correctly.

[0233] For example, when the cause of the link failure is the uplink data BER exceeding the predetermined error rate, and the reason that the uplink data BER exceeds the predetermined error rate is that the predetermined frequency the occurrence of erroneous bits is set incorrectly, the first network device can adjust the predefined frequency of occurrence of erroneous bits to avoid failure even e times on the radio link established between the UE and the second network device, because the predetermined frequency of occurrence of erroneous bits is set incorrectly.

[0234] S805. The first network device sends a second message to the UE in accordance with the first message, the second message being used to instruct the UE to release a cell, SCG, TAG, or unidirectional channel.

[0235] In particular, this step can be implemented as follows through steps (1) to (3), which include:

[0236] (1). The first network device determines the SCG identifier that owns the cell corresponding to the radio link on which the failure occurs, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG as the first release identifier, if the first message does not carry a link failure identifier.

[0237] In particular, if the first message does not carry an identifier associated with a communication link failure, the first network device determines that a failure occurs on all radio links established between the UE and the second network device, and the first network device receives the SCG identifier to which the cell corresponding to the radio link on which the failure occurs, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG, and determines the SCG identifier that owns the cell corresponding to the radio link on which the failure occurs, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG as the first release identifier.

[0238] The bearer identifier served by the SCG may be an RB identifier or may be an E-RAB identifier. Preferably, the bearer identifier served by the SCG is an RB identifier.

[0239] A typical operation for obtaining a cell identifier included in an SCG may be as follows: The first network device obtains the identifier of the corresponding cell from the stored correspondence between the SCG identifier and the cell identifier in accordance with the SCG identifier to which the cell corresponding to the radio link on which a failure occurs and determines the received cell identifier as the identifier of the cell included in the SCG.

[0240] Each SCG includes one main cell, and each SCG may not include a sub cell or include one or more sub cells. When a failure occurs on a radio link established between the UE and the main cell included in the SCG, the UE cannot transmit data with a second network device over the radio link established between the UE and the slave cell also included in the SCG.

[0241] Each SCG may serve one or more RBs, and one RB may be served by the MCG and one or more SCGs, or may be served by only one SCG.

[0242] (2). The first network device determines the first release identifier in accordance with the link failure identifier if the first message carries the link failure identifier.

[0243] A typical operation of determining a first release identifier by a first network device in accordance with a link failure identifier may be as follows: Define a cell identifier as a first release identifier if the link failure identifier is an identifier of a cell corresponding to a radio link, on which a failure occurs; determine the SCG identifier, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG as the first release identifier, if the identifier associated with the link failure is the identifier of the SCG to which the cell corresponding to the line belongs radio communication on which the failure occurs; determine the TAG identifier or the identifier of the cell included in the TAG as the first release identifier, if the identifier associated with the link failure is the identifier TAG, which belongs to the cell corresponding to the radio link on which the failure occurs; or determine the identifier of the SCG serving the unidirectional channel, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG as the first release identifier, if the identifier associated with the link failure is the identifier of the unidirectional channel, corresponding radio link on which the failure occurs.

[0244] (3). The first network device sends a second message to the UE, the second message carrying the first release identifier.

[0245] If necessary, if the first message does not carry the identifier associated with the communication link failure, the first network device can directly send the second message to the UE, the second message also not transferring the first release identifier.

[0246] S806. The first network device sends a third message to the second network device in accordance with the first message, the third message being used to indicate that the second network device needs to free a resource used to service the UE.

[0247] In particular, if the first message does not carry an identifier associated with a communication link failure, then the UE identifier is determined as the second release identifier; or the second release identifier is determined in accordance with the link failure identifier if the first message carries the link failure identifier and the third message is sent to the second network device, the third message transferring the second release identifier.

[0248] A representative operation of determining a second release identifier in accordance with a link failure identifier may be as follows: Define a UE identifier and a cell identifier as a second release identifier if the link failure identifier is an identifier of a cell corresponding to a radio link, on which a failure occurs; determine the UE identifier as the second release identifier if the identifier associated with the communication link failure is the identifier of the SCG to which the cell belongs, corresponding to the communication line on which the failure occurs; determine the UE identifier and the TAG identifier as the second release identifier, or determine the UE identifier and the cell identifier included in the TAG as the second release identifier, if the link failure identifier is the TAG identifier that owns the cell corresponding to the radio link on which a failure occurs; or determine the UE identifier as the second release identifier, or determine the UE identifier and the unidirectional channel identifier served by the SCG serving the unidirectional channel as the second release identifier if the link failure identifier is an unidirectional channel identifier corresponding to the radio link on which failure occurs.

[0249] Since the identifier of the bearer channel corresponding to the radio link on which the failure occurs is the identifier RB, the identifier of the bearer channel served by the SCG serving the RB may be an RB identifier or may be an E-UTRAN Radio Access Bearer, unidirectional radio access channel E-UTRAN) corresponding to RB. The E-RAB identifier is the identifier of the E-RAB corresponding to RB; the first network device can obtain the identifier of the corresponding E-RAB from the stored correspondence between the identifier of the RB and the identifier of the E-RAB in accordance with the identifier of the RB and determine the received identifier of the E-RAB as the identifier of the E-RAB corresponding to the RB.

[0250] S807. The UE receives a second message sent by the first network device, the second message being used to instruct the UE to release a cell, a group of subordinate SCG cells, a TAG timing group, or a unidirectional channel; and frees the cell, SCG, TAG or unidirectional channel in accordance with the second message.

[0251] In particular, if the second message does not carry the first release identifier, then the UE releases the SCG corresponding to the second network device.

[0252] If the second message does not carry the first release identifier, then it is determined that none of the radio links established between the UE and the second network device can be used in the usual manner, and the UE releases the SCG corresponding to the second network device.

[0253] The characteristic SCG release operation corresponding to the second network device by the UE is the same as that described in the aforementioned Embodiment 1 and is no longer specified here. If the second message carries the first release identifier, then the UE releases the cell, SCG, TAG, or unidirectional channel in accordance with the first release identifier.

[0254] An exemplary operation to release a cell, SCG, TAG, or unidirectional channel according to the first release identifier may look like this: Release the cell if the first release identifier is the cell identifier and the cell is a slave cell included in the SCG; release the SCG if the first release identifier is the cell identifier and the cell is the main cell included in the SCG, the first release identifier is the SCG identifier, or the first release identifier is the identifiers of all cells included in the SCG; release the TAG if the first release identifier is a TAG identifier; release the cell included in the TAG if the first release identifier is the identifier of the cell included in the TAG; or release the unidirectional channel served by the SCG, if the first release identifier is the identifier of the unidirectional channel served by the SCG.

[0255] Cells included in one TAG may be cells controlled by a single network device, or may be cells controlled by several network devices. Accordingly, a typical release operation of a cell included in a TAG may look as follows: When the cells included in the TAG are cells controlled by one network device, directly release all the cells included in the TAG. When the cells included in the TAG are cells controlled by several network devices, select a cell controlled by the second network device from the cells included in the TAG and release the selected cell.

[0256] A typical unidirectional channel release operation served by the SCG may look like this:

[0257] If the identifier of the bearer channel served by the SCG is the identifier of the RB, when RB is served only by the SCG, release the RB, that is, release the PDCP entity, the RLC entity, and the logical channel related to RB. When the RB is served by the MCG and SCG, then release the part of the unidirectional channel that is served by the SCG, that is, release the RLC entity and logical channel that correspond to the SCG in the RLC entities and logical channels that belong to the unidirectional channel.

[0258] If the identifier of the bearer channel served by the SCG is an E-RAB identifier, then the UE, in accordance with the E-RAB identifier, obtains the identifier of the corresponding RB from the stored correspondence between the identifier RB and the identifier E-RAB. When the RB is served only by the SCG, release the RB, that is, release the PDCP entity, the RLC entity, and the logical channel that belong to the RB. When the RB is served by the MCG and SCG, then release the part of the unidirectional channel that is served by the SCG, that is, release the RLC entity and logical channel that correspond to the SCG in the RLC entities and logical channels that belong to the unidirectional channel.

[0259] S808. The second network device receives a third message sent by the first network device, the third message being used to instruct the second network device to release a resource used to service the UE; and in accordance with the command message, releases the resource used to service the UE.

[0260] The third message may carry the second release identifier, and the resource used to service the UE is released in accordance with the second release identifier.

[0261] In particular, the second network device receives the third message. If the second release identifier is the UE identifier, then the resource used to service the UE is freed; if the second release identifier is the UE identifier and the cell identifier, then the cell resource used to service the UE is freed; if the second release identifier is a UE identifier and a TAG identifier, then the TAG resource used to service the UE is released; if the second release identifier is the UE identifier and the identifier of the cell included in the TAG, then the resource of the cell included in the TAG used to service the UE is freed; or a resource used to service a unidirectional channel at a UE is released if the second release identifier is an UE identifier and an unidirectional channel identifier served by an SCG serving a unidirectional channel.

[0262] Cells included in one TAG may be cells controlled by one network device, or may be cells controlled by multiple network devices. Accordingly, a typical operation of releasing the resource of a cell included in a TAG may look as follows: When the cells included in the TAG are cells controlled by one network device, directly free the resources of all cells included in the TAG. When the cells included in the TAG are cells controlled by several network devices, select a cell controlled by the second network device from the cells included in the TAG and free the resource of the selected cell.

[0263] A typical operation of releasing a resource used to service a unidirectional channel at a UE may be as follows: If the identifier of a unidirectional channel served by an SCG serving a unidirectional channel is an RB identifier, then in accordance with the RB identifier, obtain the identifier of the corresponding E-RAB from stored correspondence between the RB identifier and the E-RAB identifier and release the resource used to service the E-RAB of the UE. If the unidirectional channel identifier served by the SCG serving the unidirectional channel is an E-RAB identifier, then directly release the resource used to service the E-RAB of the UE.

[0264] In this embodiment of the present invention, the first network device may issue a command to free a resource only to the UE or the second network device, or may issue a command to free the resource of both the UE and the second network device. That is, the first network device can send only the second message or the third message, or it can simultaneously (or asynchronously) send the second message and the third message to instruct the UE and / or the second network device to release the associated resource and configuration, which is not limited in this embodiment the implementation of the present invention.

[0265] In this embodiment of the present invention, when the slave base station detects that a radio link failure occurs between the slave base station and the UE, the slave base station sends a message to the main base station to notify the main base station that a radio link failure is occurring between the UE and the slave base station, so that the main base station finds out that a radio link failure occurs between the UE and the slave base station, and therefore unnecessary op walkie-talkie, such as SRB recovery and re-activation of security. In addition, the main base station can also perform additional processing in the event of a radio link failure, for example, free up a resource associated with a slave base station and / or UE, so that the slave base station reallocates the resource to that UE as soon as possible, thereby effectively reducing user interruption time data caused by a radio link failure, and improving user experience for the user.

Option 5 implementation

[0266] This embodiment of the present invention provides a radio link failure processing apparatus that is located on the user equipment side. Referring to FIG. 9, the device includes:

a detecting unit 901 configured to detect if a failure occurs on a radio link established between the user equipment and the second network device; and

a sending unit 902, configured to: send a first message to the first network device when the detection unit 901 detects that a failure occurs on a radio link established between the user equipment and the second network device, the first message being used to indicate that a failure is occurring on the radio link, installed between the user equipment and the second network device.

[0267] The detection unit 901 is configured, in particular, for:

determining that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of the random access request by the user equipment on the first radio link reaches or exceeds the maximum number of retransmissions of the random access preamble, the first radio link being any radio link established between the user equipment and the second network device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the timer corresponding to the first cell reaches or exceeds the timer duration, the first cell being any one hundredth of the second network device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of the uplink data for controlling the RLC radio by the user equipment on the first unidirectional radio channel reaches or exceeds the maximum number of retransmissions of the uplink data RLC, wherein the first unidirectional radio channel is any unidirectional radio channel through which the second network your device serves the user equipment and is carried over one or more radio links established between the user equipment and the second network device.

[0268] Referring to FIG. 10, a device for processing a radio link failure preferably further includes:

a receiving unit 903 configured to receive a configuration parameter, the configuration parameter including one or more of the following parameters:

the maximum number of retransmissions of the random access preamble, the duration of the timer, and the maximum number of retransmissions of RLC uplink data, the configuration parameter being received by the first network device from the second network device and sent to the user equipment, or the configuration parameter sent by the second network device to the user equipment.

[0269] In addition, the first message carries a link failure identifier, and the link failure identifier includes one or more of the following identifiers: the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells, which belongs to the cell corresponding to the radio link on which the failure occurs, the identifier of the temporary advance group TAG, which belongs to the cell corresponding to the radio link on which the failure, and identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

[0270] Preferably, the first message carries the cause of the link failure.

[0271] In addition, the cause of the communication link failure includes: a random access problem, a number of retransmissions of a random access preamble reaching or exceeding a maximum number of retransmissions of a random access preamble, a number of retransmissions of RLC uplink data reaching or exceeding a maximum number retransmissions of RLC uplink data, end of timer, or reconfiguration failure.

[0272] The receiving unit 903 is further configured to receive a command message sent by the first network device, the command message being used to instruct the user equipment to release the cell, SCG slave group, TAG timing advance group, or unidirectional channel; and the device further includes:

a release unit 904 configured to release a cell, SCG, TAG, or unidirectional channel in accordance with a command message.

[0273] In addition, the block 904 release is configured, in particular, for:

releasing the SCG corresponding to the second network device when the command message does not carry the release identifier; or

release a cell, SCG, TAG, or unidirectional channel according to the release identifier when the command message carries the release identifier.

[0274] When the command message carries the release identifier, the release unit 804 is configured, in particular for:

cell release, when the release identifier is a cell identifier, and the cell is a sub cell in the SCG;

releasing the SCG when the release identifier is the cell identifier and the cell is the main cell in the SCG, or when the release identifier is the SCG identifier, or when the release identifier is the identifiers of all cells included in the SCG;

TAG releases when the release identifier is a TAG identifier;

releasing a cell that is in the TAG and controlled by the second network device when the release identifier is the cell identifier in the TAG; or

the release of the unidirectional channel served by the SCG when the release identifier is the identifier of the unidirectional channel served by the SCG.

[0275] It should be noted that the reception unit in this embodiment may be a receiver in the UE, the sending unit may be a transmitter in the UE. In addition, the reception unit and the sending unit can also be combined to form a transceiver in the UE. For implementation, the detection unit may be a separately located processor or may be integrated into the UE processor, or may be stored in the memory of the UE as program code, and the UE processor will call and execute the function of the aforementioned detection unit. The implementation of the release unit is the same as the implementation of the detection unit, and the release unit can be combined with the detection unit or can be implemented separately. The processor in this document may be a single Central Processing Unit (CPU), or a specialized integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits configured to implement this embodiment of the present invention.

[0276] In this embodiment of the present invention, when the user equipment detects that a radio link failure occurs between the user equipment and the slave base station, the user equipment sends a message to the main base station to notify the main base station that a radio link failure occurs between The UE and the slave base station, so that the main base station learns that a radio link failure occurs between the UE and the slave base station, and therefore you can no longer perform unnecessary operations, such as restoring the SRB and re-activating security. In addition, the main base station can also perform additional processing in the event of a radio link failure, for example, free up a resource associated with a slave base station and / or UE, so that the slave base station reallocates the resource to that UE as soon as possible, thereby effectively reducing user interruption time data caused by a radio link failure, and improving user experience for the user.

Option 6 implementation

[0277] This embodiment of the present invention provides an apparatus for detecting a radio link failure, which is located on the side of the second network device. Referring to FIG. 11, the device includes:

a detection unit 1101 configured to detect whether a failure occurs on a radio link established between the user equipment and the second network device.

an interface unit 1102 configured to: forward the first message to the first network device when the detection unit 1101 detects that there is a failure on a radio link established between the user equipment and the second network device, the first message being used to indicate that a failure is occurring on the radio link, installed between the user equipment and the second network device.

[0278] The detection unit 1101 is configured, in particular, for:

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the number of attempts to receive the random access request sent by the user equipment by the second network device on the first radio link reaches or exceeds the maximum number of attempts to receive the random access request wherein the first radio link is any radio link established between the user equipment and the WTO th network device; or

determining that a failure occurs on a radio link established between the user equipment and the second network device when it is detected that sending information of the physical downlink control channel PDCCH to the second network device to the user equipment on the first radio link reaches or exceeds the maximum number of PDCCH retransmissions, wherein the first radio link is any radio link established between the user equipment and the second network device Twomey; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the number of retransmissions of downlink data for controlling the RLC of the second network device over the first unidirectional radio channel reaches or exceeds the maximum number of retransmissions of downlink data RLC communication, the first unidirectional radio channel being any unidirectional radio channel through which the second network the building serves user equipment and which is carried over one or more radio links established between the user equipment and the second network device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the frequency of blocks with errors in the uplink data sent by the user equipment and received on the first radio link by the second network device is greater than or equal to previously a given frequency of blocks with errors, the first radio link being any radio link established between the user equipment and the second etevym device; or

determining that a failure occurs on the radio link established between the user equipment and the second network device when it is detected that the frequency of erroneous bits of the uplink data sent by the user equipment and received on the first radio link by the second network device is greater than or equal to previously a given frequency of occurrence of erroneous discharges, the first radio link being any radio link established between the user equipment and a second network device.

[0279] In addition, the interface unit 1102 is further configured to receive a configuration parameter sent by the first network device, the configuration parameter including one or more of the following parameters:

the maximum number of attempts to accept a random access request, the maximum number of retransmissions of a PDCCH, the maximum number of retransmissions of RLC downlink data, a predetermined frequency of errored blocks and a predetermined frequency of occurrence of erroneous bits.

[0280] Preferably, the first message carries a user equipment identifier and a link failure identifier, and a link failure identifier includes one or more of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

[0281] In addition, the first message carries the cause of the link failure.

[0282] The cause of the link failure includes: the number of times a random access request is received, reaching or exceeding the maximum number of attempts to receive a random access request, the number of PDCCH retransmissions, reaching or exceeding the maximum number of PDCCH retransmissions, the number of retransmissions of downlink data RLC reaching or exceeding the maximum number of retransmissions of RLC downlink data, block frequency of errors in uplink data, available gayuschuyu or greater than the predetermined block error rate, frequency of occurrence of erroneous bits in an uplink data reaches or exceeds a predetermined error rate of bits, the problem of reception on the uplink or send the problem to the downlink.

[0283] In addition, the interface unit 1102 is further configured to receive a command message sent by the first network device, the command message being used to instruct the second network device to release a resource used to service user equipment; and, as shown in FIG. 12, the device further includes:

a release unit 1103 configured to release a resource used to service user equipment in accordance with a command message.

[0284] In addition, the release unit 1103 is configured, in particular, for:

releasing a resource used to service user equipment when the command message includes an identifier of the user equipment; or

releasing a cell resource used for servicing user equipment when the command message includes a user equipment identifier and a cell identifier; or

releasing the TAG resource used to service the user equipment when the command message includes a user equipment identifier and a TAG identifier; or

releasing a cell resource included in the TAG and managed by the second network device used to service the UE when the command message includes an identifier of a user equipment and an identifier of a cell included in a TAG; or

releasing the resource used to service the unidirectional channel of the user equipment when the command message includes the identifier of the user equipment and the identifier of the unidirectional channel.

[0285] It should be noted that the interface unit in this embodiment may be an interface circuit whereby the second network device communicates with the first network device. For implementation, the detection unit may be a separate processor or may be integrated into the processor of the second network device, or may be stored in the storage device of the second network device in the form of program code, and the processor of the second network device will call and execute the function of the aforementioned detection unit. The implementation of the release unit is the same as the implementation of the detection unit, and the release unit can be combined with the detection unit or can be implemented separately. The processor in this document may be a Central Processing Unit (CPU), a specialized integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits configured to implement this embodiment of the present invention.

[0286] In this embodiment of the present invention, when the slave base station detects that a radio link failure occurs between the slave base station and the UE, the slave base station sends a message to the main base station to notify the main base station that a radio link failure is occurring between the UE and the slave base station, so that the main base station finds out that a radio link failure occurs between the UE and the slave base station, and therefore unnecessary op walkie-talkie, such as SRB recovery and re-activation of security. In addition, the main base station can also perform additional processing in the event of a radio link failure, for example, free up a resource associated with a slave base station and / or UE, so that the slave base station reallocates the resource to that UE as soon as possible, thereby effectively reducing user interruption time data caused by a radio link failure, and improving user experience for the user.

Option 7 implementation

[0287] This embodiment of the present invention provides an apparatus for detecting a radio link failure that is located on the side of the first network device. Referring to FIG. 13, the device includes:

a transceiver unit 1301 configured to communicate with user equipment;

an interface unit 1302 configured to communicate with a second network device;

a receiving unit 1303 configured to receive a first message from a user equipment or a second network device through a transceiver unit 1301 or an interface unit 1302, the first message being sent to the first network device by the user equipment or the second network device when a failure occurs on a radio link established between the user equipment and a second network device; and

a determination unit 1304 configured to determine, in accordance with the first message, that a failure occurs on a radio link established between the user equipment and the second network device.

[0288] The first message carries an identifier associated with a communication failure, and the identifier associated with a communication failure includes one or more of the following identifiers:

the identifier of the cell corresponding to the radio link on which the failure occurs, the identifier of the group of subordinate SCG cells to which the cell belongs, the corresponding radio line on which the failure occurs, the identifier of the time advance group TAG to which the cell corresponding to the radio line on which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs.

[0289] In addition, the first message further carries the identifier of the user equipment.

[0290] Preferably, the first message carries the cause of the link failure.

[0291] The cause of the link failure includes: a random access problem, the number of retransmissions of the random access preamble reaching or exceeding the maximum number of retransmissions of the uplink RLC data, the number of retransmissions of the uplink RLC data reaching or exceeding the maximum number of retransmissions RLC uplink data transmissions, timer expiration, reconfiguration failure, number of times a random access request is received, reaching or exceeding ma the maximum number of attempts to receive a random access request, the number of PDCCH retransmissions reaching or exceeding the maximum number of PDCCH retransmissions, the number of retransmitting RLC downlink data transmissions, reaching or exceeding the maximum number of retransmitting RLC downlink data, block error rate for data uplink that reaches or exceeds the predefined frequency of blocks with errors, the frequency of occurrence of erroneous bits in the data is ascending communication line, reaching or exceeding a predetermined frequency of occurrence of erroneous bits, the problem of reception on the uplink or the problem of sending on the downlink.

[0292] Further, after the determination unit 1304 determines that a failure occurs on a radio link established between the user equipment and the second network device, the determination unit 1304 is further configured to:

initiating a transceiver unit 1301 to send a second message to the user equipment, the second message being used to instruct the user equipment to release the cell, SCG slave group, TAG timing advance group, or unidirectional channel; and / or

initiating an interface unit 1302 for sending a third message to the second network device, the third message being used to instruct the second network device to release a resource used to service user equipment.

[0293] In addition, the determination unit 1304 is further configured, in particular, to initiate the transceiver unit 1301 to send a second message to the user equipment carrying the first release identifier, wherein:

the first release identifier includes the SCG identifier that owns the cell corresponding to the radio link on which the failure occurs, the identifier of the cell included in the SCG, the identifier of the main cell included in the SCG, or the identifier of the unidirectional channel served by the SCG when the first message does not carry link failure identifier; or

the first release identifier is determined in accordance with the link failure identifier when the first message carries the link failure identifier.

[0294] When the first message carries an identifier associated with a link failure:

the first release identifier includes a cell identifier when the identifier associated with a communication link failure includes an identifier of a cell corresponding to the radio link on which the failure occurs; or

the first release identifier includes an SCG identifier, an identifier of a cell included in an SCG, an identifier of a main cell included in an SCG, or an unidirectional channel identifier served by an SCG when the link failure identifier includes an SCG identifier to which the cell corresponding the radio link on which the failure occurs; or

the first release identifier includes a TAG identifier or an identifier of a cell included in a TAG when the link failure identifier includes a TAG identifier to which a cell belongs, corresponding to a radio link on which a failure occurs; or

the first release identifier includes an identifier of an SCG serving a unidirectional channel, an identifier of a cell included in an SCG, an identifier of a main cell included in an SCG, or an identifier of a unidirectional channel served by an SCG, when the identifier associated with a link failure includes an unidirectional channel identifier, corresponding radio link on which the failure occurs.

[0295] The determination unit 1304 is further configured, in particular, to initiate an interface unit 1302 for sending a second message to the second network device carrying the second release identifier, wherein:

the second release identifier includes an identifier of a user equipment when the first message does not carry an identifier associated with a link failure; or

the second release identifier is determined in accordance with the link failure identifier when the first message carries the link failure identifier.

[0296] When the first message carries an identifier associated with a link failure,

the second release identifier includes a user equipment identifier and a cell identifier when the identifier associated with a communication link failure includes an identifier of a cell corresponding to the radio link on which the failure occurs; or

the second release identifier includes a user equipment identifier when the identifier associated with a communication link failure includes an SCG identifier to which a cell belongs, corresponding to a radio link on which a failure occurs; or

the second release identifier includes a user equipment identifier and a TAG identifier, or includes a user equipment identifier and a cell identifier included in the TAG when the link failure identifier includes a TAG identifier that owns a cell corresponding to the radio link on which a failure occurs; or

the second release identifier includes a user equipment identifier or includes a user equipment identifier and an unidirectional channel identifier served by an SCG serving a unidirectional channel when the link failure identifier includes an unidirectional channel identifier corresponding to the radio link on which the failure occurs .

[0297] In addition, the transceiver unit 1301 is further configured, in particular for:

sending the first configuration parameter to the user equipment, wherein the first configuration parameter includes one or more of the following parameters: a maximum number of retransmissions of a random access preamble, a timer duration and a maximum number of retransmissions of uplink data of an RLC radio control link; and / or

sending the second configuration parameter to the second network device, the second configuration parameter including one or more of the following parameters: the maximum number of attempts to receive a random access request, the maximum number of retransmissions of a physical downlink control channel PDCCH, the maximum number of retransmissions of RLC downlink data , a predefined frequency of blocks with errors and a predefined frequency of occurrence of erroneous bits.

[0298] It should be noted that the reception unit in this embodiment may be a receiver in the first network device. In addition, the reception unit and the transceiver unit can also be combined to form a transceiver in the first network device. For implementation, the receiving unit may be a separately located processor or may be integrated into the processor of the first network device, or may be stored in the storage device of the first network device in the form of program code, and the processor of the first network device will call and perform the function of the aforementioned receiving unit. The implementation of the definition unit is the same as the implementation of the acquisition unit, and the determination unit can be combined with the acquisition unit or can be implemented separately. The processor in this document may be a Central Processing Unit (CPU), or a specialized integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits configured to implement this embodiment of the present invention.

[0299] In this embodiment of the present invention, when the user equipment or the slave base station detects that a radio link failure occurs between the UE and the slave base station, the user equipment or the slave base station sends a message to the main base station to notify the main base station that a radio link failure occurs between the UE and the slave base station, so that the main base station learns that a radio link failure occurs between the UE and the sub internal base station, and therefore you can no longer perform unnecessary operations, such as restoring the SRB and re-activating security. In addition, the main base station can also perform additional processing in the event of a radio link failure, for example, free up a resource associated with a slave base station and / or UE, so that the slave base station reallocates the resource to that UE as soon as possible, thereby effectively reducing user interruption time data caused by a radio link failure, and improving user experience for the user.

Option 8 implementation

[0300] Continuing to refer to FIG. 14, FIG. 14 is a schematic structural diagram of another embodiment of a UE in accordance with the present invention. As shown in FIG. 14, the UE includes a receiver 1401, a transmitter 1402, a storage device 1403, and a processor 1404. A receiver 1401, a transmitter 1402, and a storage device 1403 are connected to a processor 1404, for example, can be connected via a bus. Of course, the UE may further include general-purpose components, for example, an antenna, a baseband processing component, an intermediate-frequency processing component, and an input / output device, which is not limited in this embodiment of the present invention.

[0301] A receiver 1401 and a transmitter 1402 may be combined to form a transceiver.

[0302] A storage device 1403 is configured to store executable program code, the program code including a machine operation instruction. The storage device 1403 may include a high-speed random access memory or may further include a non-volatile memory, for example at least one disk storage device.

[0303] The processor 1404 may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement this embodiment of the present invention.

[0304] The processor 1404 executes the program code stored in the memory 1403 to detect if a failure occurs on a radio link established between the UE and the second network device, and send the first message to the first network device via the transmitter 1402 when it is detected that a failure has occurred on a radio link established between the UE and the second network device, the first message being used to indicate that a failure occurs on the radio link established between the user equipment and a second network device.

[0305] In particular, the method by which the processor 1404 detects whether a failure occurs on the radio link established between the UE and the second network device is the same as in the description of the detection unit 901 in Embodiment 1, Embodiment 2 and Embodiment 5 above, and is no longer specified here.

[0306] In addition, the parameter used when the processor 1404 detects whether a failure occurs on a radio link established between the UE and the second network device can be obtained from the first network device via a receiver 1401 or can be obtained from a second network device via a receiver 1401; and the essence of the parameter is the same as in the aforementioned Embodiments 1, 2 and 5, and is not specified here.

[0307] The content of the first message is the same as in the aforementioned Embodiments 1, 2 and 5, and is no longer specified here.

[0308] After the processor 1404 sends the first message to the first network device via the transmitter 1402, the processor 1404 may further receive, via the receiver 1401, a command message sent by the first network device, the command message being used to issue a command to the UE to release a cell, a group of slaves SCG cell, TAG timing advance group or unidirectional channel; and processor 1404 is further configured to release a cell, SCG, TAG, or unidirectional channel in accordance with a command message.

[0309] The process by which processor 1404 releases a cell, SCG, TAG, or unidirectional channel is the same as in the aforementioned Embodiments 1, 2, and 5, and is no longer specified here.

[0310] In this embodiment of the present invention, when the user equipment detects that a radio link failure occurs between the user equipment and the slave base station, the user equipment sends a message to the main base station to notify the main base station that a radio link failure occurs between The UE and the slave base station, so that the main base station learns that a radio link failure occurs between the UE and the slave base station, and therefore you can no longer perform unnecessary operations, such as restoring the SRB and re-activating security. In addition, the main base station can also perform additional processing in the event of a radio link failure, for example, free up a resource associated with a slave base station and / or UE, so that the slave base station reallocates the resource to that UE as soon as possible, thereby effectively reducing user interruption time data caused by a radio link failure, and improving user experience for the user.

Option 9 implementation

[0311] Continuing to refer to FIG. 15, FIG. 15 is a schematic structural diagram of another embodiment of a first network device in accordance with the present invention. As shown in FIG. 15, the first network device includes a receiver 1501, a transmitter 1502, a storage device 1503, an interface circuit 1505 and a processor 1504. A receiver 1501, a transmitter 1502, an interface circuit 1505 and a storage device 1503 are connected to a processor 1504, for example, can be connected via a bus . Of course, the first network device may further include general application components, for example, an antenna, a baseband processing component, an intermediate radio frequency processing component, and an input / output device, which is not limited in this embodiment of the present invention.

[0312] A receiver 1501 and a transmitter 1502 may be combined to form a transceiver.

[0313] A storage device 1503 is configured to store executable program code, the program code including a machine operation instruction. Storage device 1503 may include a high speed random access memory or may further include non-volatile memory, for example at least one disk storage device.

[0314] The processor 1504 may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement this embodiment of the present invention.

[0315] An interface circuit 1505 is configured to connect to another network device, and may be, for example, a fiber optic interface to communicate with a second network device via optical fiber.

[0316] A processor 1504 is configured to receive a first message from a second network device or UE via an interface circuit or receiver 1501 1505, wherein the first message is sent by the second network device or UE to the first network device after the second network device or UE detects that a failure occurs on a radio link established between the UE and the second network device. After receiving the first message, the processor 1504 may determine that a failure occurs on the radio link established between the UE and the second network device.

[0317] In addition, the processor 1504 may further perform subsequent processing upon failure. For example, processor 1504 delivers command messages (second message and third message) to the UE and the second network device via transmitter 1502 and interface circuitry 1505, respectively, to instruct the UE to release the cell, SCG slave group, TAG timing group, or unidirectional channel, and instruct the second network device to release the resource used to service the UE, respectively. Of course, the processor 1504 can deliver a command message only to the UE or only to the second network device.

[0318] The description of the command messages (for example, the second message and the third message) is the same as in the above embodiment, and is no longer specified here.

[0319] The content of the first message is the same as in the above embodiment, and is no longer specified here.

[0320] In addition, the processor 1504 may further configure the parameter so that the UE and the second network device detect a link failure; for example, processor 1504 can send a configuration parameter to the UE via transmitter 1502 so that the UE detects whether a failure occurs on a radio link established between the UE and the second network device, and the configuration parameter is the same as described in the above Options 1, 2, and 5 implementation, and here is no longer specified. In another example, processor 1504 may send a configuration parameter to a second network device via an interface circuit 1505 so that the second network device detects if a failure occurs on a radio link established between the UE and the second network device. The configuration parameter is the same as described in the aforementioned Embodiments 3, 4 and 6, and is no longer specified here.

[0321] In this embodiment of the present invention, when the user equipment or the slave base station detects that a radio link failure occurs between the UE and the slave base station, the user equipment or the slave base station sends a message to the main base station to notify the main base station that a radio link failure occurs between the UE and the slave base station, so that the main base station learns that a radio link failure occurs between the UE and the sub internal base station, and therefore you can no longer perform unnecessary operations, such as restoring the SRB and re-activating security. In addition, the main base station can also perform additional processing in the event of a radio link failure, for example, free up a resource associated with a slave base station and / or UE, so that the slave base station reallocates the resource to that UE as soon as possible, thereby effectively reducing user interruption time data caused by a radio link failure, and improving user experience for the user.

Option 10 implementation

[0322] Continuing to refer to FIG. 16, FIG. 16 is a schematic structural diagram of another embodiment of a second network device in accordance with the present invention. As shown in FIG. 16, the second network device includes a receiver 1601, a transmitter 1602, a storage device 1603, an interface circuit 1605, and a processor 1604. A receiver 1601, a transmitter 1602, an interface circuit 1605, and a storage device 1603 are connected to a processor 1604, for example, can be connected via a bus . Of course, the second network device may further include components of general application, for example, an antenna, a baseband processing component, an intermediate radio frequency processing component, and an input / output device, which is not limited in this embodiment of the present invention.

[0323] A receiver 1601 and a transmitter 1602 may be combined to form a transceiver.

[0324] A storage device 1603 is configured to store executable program code, the program code including a machine operation instruction. The storage device 1603 may include a high speed random access memory or may further include a non-volatile memory, for example at least one disk storage device.

[0325] The processor 1604 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement this embodiment of the present invention.

[0326] The interface circuit 1605 is configured to connect to another network device, and may be, for example, a fiber optic interface to communicate with a second network device via optical fiber.

[0327] The processor 1604 executes the program code stored in the memory 1603 to detect if a failure occurs on the radio link established between the UE and the second network device, and send the first message to the first network device through the interface circuit 1605 when it is detected that failure on a radio link established between the UE and the second network device, the first message being used to indicate that a failure occurs on the radio link established between the user equipment the second and the second network device.

[0328] In particular, the method by which the processor 1604 detects whether a failure occurs on the radio link established between the UE and the second network device is the same as in the description in Embodiment 3, Embodiment 4 and in the description of detection unit 1101 in Option 6 implementation above, and is no longer specified here.

[0329] In addition, the parameter used when the processor 1604 detects whether a failure occurs on the radio link established between the UE and the second network device can be obtained from the first network device via the interface circuit 1605 or can be pre-set locally; and the essence of the parameter is the same as in the aforementioned Embodiments 3, 4 and 6, and is not specified here.

[0330] The content of the first message is the same as in the aforementioned Embodiments 3, 4 and 6, and is no longer specified here.

[0331] After the processor 1604 sends the first message to the first network device via the interface circuit 1605, the processor 1604 may further receive a command message sent by the first network device through the interface circuit 1605, the command message being used to issue a command to release the resource used for serving the UE. The processor 1604 is further configured to free a resource used to service the UE in accordance with a command message.

[0332] The process by which the processor 1404 releases the resource used to service the UE is the same as in the above Embodiments 3, 4, and 6, and is no longer specified here.

[0333] In this embodiment of the present invention, when the slave base station detects that a radio link failure occurs between the slave base station and the UE, the slave base station sends a message to the main base station to notify the main base station that a radio link failure is occurring between the UE and the slave base station, so that the main base station finds out that a radio link failure occurs between the UE and the slave base station, and therefore unnecessary op walkie-talkie, such as SRB recovery and re-activation of security. In addition, the main base station can also perform additional processing in the event of a radio link failure, for example, free up a resource associated with a slave base station and / or UE, so that the slave base station reallocates the resource to that UE as soon as possible, thereby effectively reducing user interruption time data caused by a radio link failure, and improving user experience for the user.

[0334] One of ordinary skill in the art can understand that all or part of the steps of the embodiments can be implemented using hardware or a program issuing instructions to related hardware. The program may be stored on a computer readable storage medium. The storage medium may be read-only memory, a magnetic disk, or an optical disk.

[0335] The foregoing descriptions are merely exemplary embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the essence and principle of the present invention should fall within the protection scope of the present invention.

Claims (71)

1. A method for processing a radio link failure, the method comprising the steps of: detect using a user equipment (UE) whether a radio link failure occurs between the UE and the second network device; and send, by the UE, a first message to the first network device when it is detected that a radio link failure occurs between the UE and the second network device, the first message being used to indicate that a radio link failure occurs between the UE and the second network device, wherein the first message contains a reason communication line failure. 2. The method of claim 1, further comprising the step of take a configuration parameter, and the configuration parameter contains one or more of the following parameters: the maximum number of retransmissions of the random access preamble, the maximum number of retransmissions of uplink data for radio control (RLC), and the duration of the timer. 3. The method of claim 2, wherein the step of detecting whether a radio link failure occurs between the UE and the second network device, comprises detecting, in accordance with the configuration parameter, whether the radio link failure occurs between the UE and the second network device. 4. The method of claim 3, wherein detecting, in accordance with a configuration parameter, whether a radio link failure occurs between the UE and the second network device, comprises the steps of: when it is detected that the number of retransmissions of the random access request of the UE on the first radio link reaches or exceeds the maximum number of retransmissions of the random access preamble, it is determined that a radio link has failed between the UE and the second network device, the first radio link being the radio link established between The UE and the second network device; or when it is detected that the timer corresponding to the first cell reaches the duration or exceeds the duration of the timer, it is determined that a radio link failure occurs between the UE and the second network device, the first cell being the hundredth of the second network device; or when it is detected that the number of retransmissions of the uplink data for radio control (RLC) by the user equipment on the first unidirectional radio channel reaches or exceeds the maximum number of retransmissions of the data of the uplink RLC, it is determined that a radio link failure occurs between the UE and the second network device, moreover, the first unidirectional radio channel is a unidirectional radio channel through which the second network device serves the UE and which is carried over discharge or several radio links established between the UE and the second network device. 5. The method of claim 1, wherein the cause of the link failure comprises one or more of the following: a random access problem, the number of retransmissions of the RLC uplink data reaching or exceeding the maximum number of retransmissions of the RLC uplink data, and the end a timer. 6. The method of claim 5, wherein the random access problem comprises a number of retransmissions of a random access preamble reaching or exceeding a maximum number of retransmissions of a random access preamble. 7. The method according to p. 1, also containing stages in which: receive, using the UE, a command message from the first network device, the command message being used to issue a command to the UE to release a cell, a slave cell group (SCG), a timing advance group (TAG), or a unidirectional channel; and release the cell, SCG, TAG or unidirectional channel in accordance with the command message. 8. The method according to claim 1, in which the restoration of a unidirectional signaling radio channel (SRB) and re-activation of security are not performed. 9. The method of claim 1, wherein the first message comprises an identifier associated with a communication failure and an identifier associated with a communication failure contains one or more of the following identifiers: identifier of the cell corresponding to the radio link on which the failure occurs, identifier of the group of slave cells (SCG) to which the cell belongs, corresponding to the radio line on which the failure occurs, identifier of the time advance group (TAG) to which the cell corresponding to the radio link belongs to which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs. 10. A method for processing a radio link failure, the method comprising the steps of: receive, using the first network device from the user equipment (UE), the first message, the first message being used to indicate that there is a radio link failure between the UE and the second network device, the first message containing the cause of the communication line failure; and determining, using the first network device in accordance with the first message, that a radio link failure has occurred between the UE and the second network device. 11. The method according to p. 10, also containing stages in which: send, using the first network device to the UE, a configuration parameter, wherein the configuration parameter is used to detect a radio link failure and contains one or more of the following parameters: the maximum number of retransmissions of the random access preamble, the maximum number of retransmissions of uplink data for radio control (RLC), and the duration of the timer. 12. The method of claim 11, wherein the configuration parameter is received by the first network device from the second network device and sent to the UE. 13. The method of claim 10, wherein the cause of the link failure comprises one or more of the following: a random access problem, the number of retransmissions of RLC uplink data that reaches or exceeds the maximum number of retransmissions of RLC uplink data, and the end a timer. 14. The method of claim 13, wherein the random access problem comprises a number of retransmissions of a random access preamble reaching or exceeding a maximum number of retransmissions of a random access preamble. 15. The method according to p. 10, also containing stages in which: send, using the first network device to the UE, a command message, the command message being used to issue a command to the UE to release a cell, slave cell group (SCG), time advance group (TAG), or unidirectional channel. 16. The method according to p. 10, in which the first message contains an identifier associated with a communication failure and an identifier associated with a communication failure contains one or more of the following identifiers: identifier of the cell corresponding to the radio link on which the failure occurs, identifier of the group of slave cells (SCG) to which the cell belongs, corresponding to the radio line on which the failure occurs, identifier of the time advance group (TAG) to which the cell corresponding to the radio link belongs to which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs. 17. The method of claim 16, wherein the first message also carries the UE identifier. 18. The method according to p. 10, in which the restoration of a unidirectional signaling radio channel (SRB) and re-activation of security are not performed. 19. An apparatus for processing a radio link failure located on a user equipment (UE) side, the apparatus comprising: a detection unit configured to detect if a radio link failure occurs between the UE and the second network device; and a sending unit configured to send a first message to the first network device when the detection unit detects that a radio link failure has occurred between the UE and the second network device, the first message being used to indicate that a radio link failure has occurred between the UE and the second network device, the first The message contains the cause of the link failure. 20. The device according to p. 19, also containing a receiving unit, configured to receive a configuration parameter, and the configuration parameter contains one or more of the following parameters: the maximum number of retransmissions of the random access preamble, the maximum number of retransmissions of uplink data for radio control (RLC), and the duration of the timer. 21. The device according to p. 20, in which the detection unit is configured to detecting, in accordance with the configuration parameter, whether a radio link failure occurs between the UE and the second network device. 22. The device according to p. 21, in which the detection unit is configured to: when it is detected that the number of retransmissions of the random access request of the UE on the first radio link reaches or exceeds the maximum number of retransmissions of the random access preamble, determining that a radio link has failed between the UE and the second network device, the first radio link being the radio link established between The UE and the second network device; or when it is detected that the timer corresponding to the first cell reaches the duration or exceeds the duration of the timer, determining that a radio link failure occurs between the UE and the second network device, the first cell being the hundredth of the second network device; or when it is detected that the number of retransmissions of the uplink data for radio control (RLC) by the user equipment on the first unidirectional radio channel reaches or exceeds the maximum number of retransmissions of the data of the uplink RLC, determining that a radio link failure occurs between the UE and the second network device, moreover, the first unidirectional radio channel is a unidirectional radio channel through which the second network device serves the UE and which is carried over one or more radio links established between the UE and the second network device. 23. The device according to claim 19, in which the cause of the failure of the communication line contains one or more of the following reasons: a random access problem, the number of retransmissions of the uplink data of the RLC, reaching or exceeding the maximum number of retransmissions of the data of the uplink RLC, and the end a timer. 24. The apparatus of claim 23, wherein the random access problem comprises a number of retransmissions of a random access preamble reaching or exceeding a maximum number of retransmissions of a random access preamble. 25. The device according to p. 19, also containing: a receiving unit configured to receive a command message from the first network device, the command message being used to issue a command to the UE to release a cell, slave cell group (SCG), time advance group (TAG), or unidirectional channel; and a release unit configured to release a cell, SCG, TAG, or unidirectional channel in accordance with a command message. 26. The device according to p. 19, in which the restoration of a unidirectional signaling radio channel (SRB) and re-activation of security are not performed. 27. The device according to claim 19, in which the first message contains an identifier associated with a communication failure and an identifier associated with a communication failure contains one or more of the following identifiers: identifier of the cell corresponding to the radio link on which the failure occurs, identifier of the group of slave cells (SCG) to which the cell belongs, corresponding to the radio line on which the failure occurs, identifier of the time advance group (TAG) to which the cell corresponding to the radio link belongs to which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs. 28. A device for processing the failure of a radio link located on the side of the first network device and containing: a receiving unit configured to receive a first message from a user equipment (UE), the first message being used to indicate that a radio link failure occurs between the UE and the second network device, the first message containing a cause of the communication line failure; and a determination unit configured to determine, in accordance with the first message, that a radio link failure has occurred between the UE and the second network device. 29. The device according to p. 28, also containing: a transceiver unit configured to send a configuration parameter to the UE, wherein the configuration parameter is used to detect a radio link failure and contains one or more of the following parameters: the maximum number of retransmissions of the random access preamble, the maximum number of retransmissions of uplink data for radio control (RLC), and the duration of the timer. 30. The device according to p. 29, in which the configuration parameter is received by the first network device from the second network device and sent to the UE. 31. The device according to p. 28, in which the cause of the failure of the communication line contains one or more of the following reasons: a random access problem, the number of retransmissions of uplink RLC data, reaching or exceeding the maximum number of retransmissions of uplink RLC data, and the end a timer. 32. The apparatus of claim 31, wherein the random access problem comprises a number of retransmissions of a random access preamble reaching or exceeding a maximum number of retransmissions of a random access preamble. 33. The device according to p. 28, also containing: a transceiver unit configured to send a command message to the UE, the command message being used to issue a command to the UE to release a cell, a slave cell group (SCG), a timing advance group (TAG), or a unidirectional channel. 34. The device according to p. 28, in which the first message contains an identifier associated with a communication failure and an identifier associated with a communication failure contains one or more of the following identifiers: identifier of the cell corresponding to the radio link on which the failure occurs, identifier of the group of slave cells (SCG) to which the cell belongs, corresponding to the radio line on which the failure occurs, identifier of the time advance group (TAG) to which the cell corresponding to the radio link belongs to which the failure occurs, and the identifier of the unidirectional channel corresponding to the radio link on which the failure occurs. 35. The device according to p. 34, in which the first message also carries the identifier of the UE. 36. The device according to p. 28, in which the restoration of a unidirectional signaling radio channel (SRB) and re-activation of security are not performed. 37. A user equipment (UE) comprising a device according to any one of paragraphs. 19-27. 38. A computer-readable medium containing programs executed by a processor and causing the processor to execute the method according to any one of claims. 1-9. 39. A computer-readable medium containing programs executed by a processor and causing the processor to execute the method according to any one of claims. 10-18.

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