CN106686673B - Method and device for processing SN switching failure in UE switching process - Google Patents

Method and device for processing SN switching failure in UE switching process Download PDF

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Publication number
CN106686673B
CN106686673B CN201510768091.8A CN201510768091A CN106686673B CN 106686673 B CN106686673 B CN 106686673B CN 201510768091 A CN201510768091 A CN 201510768091A CN 106686673 B CN106686673 B CN 106686673B
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information
base station
target base
entity
switching
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CN106686673A (en
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耿良
周宇恒
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/023—Buffering or recovering information during reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Abstract

The invention discloses a method and a device for processing SN (serial number) switching failure in the UE switching process, which are used for ensuring that the service of UE is not interrupted and further improving the user experience because a link between the UE and a base station does not need to be disconnected under the condition that the SN switching failure in the UE switching process. The invention provides a method for processing SN switching failure in a UE switching process, which comprises the following steps: after the UE is switched from a source base station to a target base station, if the SN information switching failure for carrying out current service communication with the UE is determined, the target base station for UE switching suspends the uplink and downlink services of the UE; the target base station acquires the SN information; and the target base station recovers and executes the uplink and downlink services of the UE according to the acquired SN information.

Description

Method and device for processing SN switching failure in UE switching process
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for processing SN switching failure in a UE switching process.
Background
In the process of switching between base stations by the UE, SNs on the UE side are always continuous, and the SN on the base station side is guaranteed to be continuous by an SN switching flow between a source base station and a target base station of the UE, and if the SN switching fails or is delayed, the SNs on the UE side and the base station side are inconsistent, thereby causing problems of Packet loss of uplink and downlink Data, Packet errors in encryption and decryption, and the like, resulting in interruption of the UE service.
In the prior art, after the UE is switched from the source base station to the target base station, if the target base station determines that the SN switching fails, the target base station releases the UE and deletes the switching data packet sent by the source base station. Therefore, the UE needs to initiate an access procedure to the target base station again to establish a link with the target base station, and at the same time, the SN of the PDCP layer of both the UE and the target base station needs to be initialized again.
It can be seen that, when the UE performs inter-base station handover operation, if SN switching fails, the service is interrupted after the UE is handed over by using the above prior art, and the service can be recovered only after the UE re-accesses the base station, which will affect user experience, and the network burden will also be increased by the re-access of the UE.
Disclosure of Invention
The embodiment of the invention provides a method and a device for processing SN switching failure in a UE switching process, which are used for ensuring that a link between UE and a base station does not need to be disconnected under the condition of SN switching failure in the UE switching process, ensuring that the service of the UE is not interrupted, reducing the burden of the UE and a network side, improving the network performance and further improving the user experience.
The method for processing SN switching failure in the UE switching process provided by the embodiment of the invention comprises the following steps:
after the UE is switched from a source base station to a target base station, if the SN information switching failure for carrying out current service communication with the UE is determined, the target base station for UE switching suspends the uplink and downlink services of the UE;
the target base station acquires the SN information;
and the target base station recovers and executes the uplink and downlink services of the UE according to the acquired SN information.
Therefore, under the condition that SN switching fails in the UE switching process, the target base station switched by the UE suspends the uplink and downlink services of the UE; the target base station acquires SN information used for carrying out current service communication with the UE; and the target base station recovers and executes the uplink and downlink services of the UE according to the acquired SN information, so that a link between the UE and the base station does not need to be disconnected, the uninterrupted services of the UE are ensured, and the user experience is further improved. In addition, because the method provided by the embodiment of the invention does not need to disconnect the link between the UE and the base station, the process that the UE accesses the network side again and the process that the UE sends the data packet lost by switching again are omitted, the burden of the UE and the network side is further reduced, and the network performance is improved.
Preferably, the target base station includes a Radio Resource Control (RRC) entity and a PDCP entity.
Preferably, the target base station of the UE determines that the SN information switching failure for performing the current service communication with the UE is failed in the following manner:
the RRC entity sends an indication message that the UE has completed handover from a source base station to the target base station to the PDCP entity;
after receiving the indication message, the PDCP entity determines that the SN information switching fails if it is determined that SN information for performing current service communication with the UE, which is sent by the source base station, has not been received before.
Preferably, the acquiring, by the target base station, the SN information specifically includes:
the PDCP entity sends an indication message of the SN information switching failure to the RRC entity;
and after receiving the indication message of the SN information switching failure, the RRC entity sends a Counter Check message to the UE, and acquires the SN information from the Counter Check Response message when receiving a Counter Check Response message sent by the UE.
Preferably, the target base station recovers to execute the uplink and downlink services of the UE according to the acquired SN information, and specifically includes:
the RRC entity sends the SN information to the PDCP entity;
and the PDCP entity recovers and executes the uplink and downlink services of the UE according to the SN information.
Preferably, the SN information includes SN information used for performing current uplink service communication with the UE and SN information used for performing current downlink service communication with the UE.
An apparatus for processing SN switching failure in a UE switching process provided in an embodiment of the present invention includes:
an RRC entity and a PDCP entity; wherein the content of the first and second substances,
the PDCP entity is used for suspending the uplink and downlink services of the UE if the SN information switching failure for the current service communication with the UE is determined after the UE is switched from the source base station to the target base station;
the RRC entity is used for acquiring the SN information after the PDCP entity determines that the SN information switching for the current service communication with the UE fails;
the PDCP entity is also used for recovering and executing the uplink and downlink services of the UE according to the SN information acquired by the RRC entity.
Preferably, the processing device for SN switching failure in the UE switching process is a target base station for UE switching.
Preferably, the RRC entity is further configured to: sending an indication message to the PDCP entity that the UE has completed handover from a source base station to the target base station;
the PDCP entity determines that the SN information switching for the current service communication with the UE fails in the following manner:
after receiving the indication message, the PDCP entity determines that the SN information switching fails if it is determined that SN information for performing current service communication with the UE, which is sent by the source base station, has not been received before.
Preferably, the PDCP entity is further configured to: sending an indication message of the SN information switching failure to the RRC entity;
when the RRC entity obtains the SN information, the RRC entity is specifically configured to: and after receiving the indication message of the SN information switching failure, the RRC entity sends a Counter Check message to the UE, and acquires the SN information from the Counter Check Response message when receiving a Counter Check Response message sent by the UE.
Preferably, the RRC entity is further configured to: transmitting the SN information to the PDCP entity;
the PDCP entity, when resuming the execution of the uplink and downlink services of the UE according to the acquired SN information, is specifically configured to: and after receiving the SN information sent by the RRC entity, the PDCP entity recovers and executes the uplink and downlink services of the UE according to the SN information.
Preferably, the SN information includes SN information used for performing current uplink service communication with the UE and SN information used for performing current downlink service communication with the UE.
Drawings
Fig. 1 is a schematic processing flow diagram of SN switching in a UE switching process of a target base station according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a processing flow involved by an RRC entity in a target base station when SN switching fails in a UE switching process according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for handling SN switching failure in a UE switching process according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a device for processing SN switching failure in a UE switching process according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method and a device for processing SN switching failure in a UE switching process, which are used for ensuring that a link between UE and a base station does not need to be disconnected under the condition of SN switching failure in the UE switching process, ensuring that the service of the UE is not interrupted, reducing the burden of the UE and a network side, improving the network performance and further improving the user experience.
A schematic processing flow diagram of the target base station when SN is switched in the UE handover process is given from an overall perspective, as shown in fig. 1.
Step S101, the UE carries out switching operation between base stations, access is initiated at a target station, and the target station builds a link for the UE.
Step S102, in the UE switching process, the PDCP entity in the target base station receives the switching data packet sent by the source base station.
The switching data packet includes service data currently performed by the UE.
Step S103, after the UE completes the handover operation from the source base station to the target base station, the PDCP entity in the target base station receives an indication message that the UE has completed the handover from the source base station to the target base station, which is sent by the RRC entity (which may also be referred to as a higher layer) in the target base station, and then the process goes to step S104.
Step S104, the PDCP entity in the target base station judges whether the SN switching message sent by the source base station is received, if the SN switching message is received, the step S108 is switched to; if the SN number switching message is not received, step S105 is performed.
The PDCP entity in the target base station determines whether to receive the SN switching message sent by the source base station, according to whether to receive SN information, which is forwarded by the RRC entity in the target base station and used for performing current service communication with the UE, sent by the source base station before receiving the indication message sent by the RRC entity of the target base station that the UE has completed switching from the source base station to the target base station.
Step S105, the PDCP entity in the target base station sends the SN switching failure message to the RRC entity in the target base station, so that the RRC entity in the target base station receives the SN switching failure message and then obtains the SN information for performing current service communication with the UE, where how the RRC entity in the target base station obtains the SN information for performing current service communication with the UE may be referred to in the following description.
Step S106, before receiving SN information which is sent by an RRC entity in the target base station and is used for carrying out current service communication with the UE, the PDCP entity in the target base station suspends the uplink and downlink services of the UE, and avoids sending a data packet with an error SN number to the UE, thereby avoiding downlink packet loss.
Step S107, the PDCP entity in the target base station receives SN information which is sent by the RRC entity in the target base station and is used for carrying out current service communication with the UE, and the SN information is configured locally.
Step S108, the PDCP entity in the target base station recovers the uplink and downlink services of the UE according to the received SN information for performing the current service communication with the UE, and sends the switching data packet sent by the source base station to the UE.
It can be seen that, through the above processing flow, when the SN switching fails in the handover process of the UE, the service of the UE can be guaranteed to be uninterrupted, thereby bringing better experience to the user.
The above processing flow of SN switching in the UE switching process is described by using the PDCP entity in the target base station as the execution subject, and accordingly, a processing flow that the RRC entity in the target base station participates in when SN switching fails in the UE switching process is given, as shown in fig. 2.
Step S201, the UE performs switching operation between base stations, access is initiated at a target station, and the target station establishes a link for the UE.
Step S202, after the UE completes the switching operation from the source base station to the target base station, the RRC entity in the target base station sends an indication message that the UE has completed the switching from the source base station to the target base station to the PDCP entity in the target base station.
Step S203, if the SN switching fails when the UE performs the inter-base station handover operation, the RRC entity in the target base station receives an indication message of the SN switching failure sent by the PDCP entity in the target base station, and then proceeds to step S204.
Step S204, the RRC entity in the target base station sends a Counter Check message to the UE to request to obtain SN information for carrying out current service communication with the UE from the UE.
Step S205, the RRC entity in the target base station receives the Counter Check Response message sent by the UE, and obtains SN information for performing current service communication with the UE from the Counter Check Response message, and then proceeds to step S206.
Step S206, the RRC entity in the target base station sends the SN information for performing the current service communication with the UE to the PDCP entity in the target base station, so that the PDCP entity in the target base station recovers and executes the uplink and downlink services of the UE according to the SN information for performing the current service communication with the UE.
The following discusses in detail a method for handling SN switching failure in a UE switching process according to an embodiment of the present invention.
Referring to fig. 3, a method for processing SN switching failure in a UE switching process provided in an embodiment of the present invention includes:
s301, after a target base station switched by UE is switched to the target base station from a source base station, if SN information switching failure for performing current service communication with the UE is determined, the target base station suspends uplink and downlink services of the UE;
in the above situation, the target base station suspends the uplink and downlink services of the UE, so as to avoid downlink packet loss caused by the base station carrying wrong SN information in the data packet when sending the downlink data packet, and also avoid uplink packet loss caused by the inconsistency between SNs on the base station side and the UE side when sending the uplink data packet.
S302, the target base station acquires the SN information;
s303, the target base station recovers and executes the uplink and downlink service of the UE according to the obtained SN information.
Preferably, the target base station includes an RRC entity and a PDCP entity.
The SN information switching failure means that when the UE is switched from the source base station to the target base station, the target base station does not receive the SN switching message sent by the source base station (the SN switching message includes SN information used by the base station to perform current service communication with the UE), so that the SN information in the PDCP layer of the base station side is inconsistent with the SN information in the PDCP layer of the UE side.
Preferably, the target base station of the UE determines that the SN information switching failure for performing the current service communication with the UE is failed in the following manner:
an RRC entity in the target base station sends an indication message that the UE has completed switching from a source base station to the target base station to a PDCP entity in the target base station;
after receiving the indication message that the UE has completed switching from the source base station to the target base station, the PDCP entity in the target base station determines that the SN information switching fails if the SN information which is sent by the source base station and used for carrying out current service communication with the UE is not received before the indication message.
Preferably, the SN information for performing current service communication with the UE, which is sent by the source base station, is sent to the RRC entity in the target base station to which the UE is handed over by the RRC entity in the source base station of the UE, and is forwarded to the PDCP entity in the target base station by the RRC entity in the target base station. And if the SN information which is transmitted by the source base station and is used for carrying out current service communication with the UE and forwarded by the RRC in the target base station is not received before the PDCP entity in the target base station receives the indication message that the UE has completed switching from the source base station to the target base station, the SN information switching failure is indicated. Preferably, it may be that the RRC entity in the target base station does not successfully receive the SN switching message sent by the source base station, so that the PDCP entity in the target base station does not receive the SN information for performing the current service communication with the UE; or the RRC entity in the target base station may receive the SN switching message sent by the source base station, but the SN switching message is not successfully sent to the PDCP entity in the target base station; other situations may also occur, such that the PDCP entity in the target base station does not receive the SN information sent by the source base station for current traffic communication with the UE. In short, for whatever reason, as long as the PDCP entity in the target base station does not receive the SN information for performing the current service communication with the UE, which is sent by the source base station, it may be determined that the SN information switching fails. Of course, if the PDCP entity in the target base station receives the SN information for performing the current service communication with the UE sent by the source base station, it determines that the SN information switching is successful, and in this case, the PDCP entity may continue to perform the uplink and downlink services of the UE directly according to the received SN information.
Preferably, the acquiring, by the target base station, the SN information for performing current service communication with the UE specifically includes:
a PDCP entity in a target base station sends an indication message of SN information switching failure to an RRC entity in the target base station;
and after receiving the indication message of the SN information switching failure, the RRC entity in the target base station sends a Counter Check message to the UE to acquire the SN information for performing current service communication with the UE, and when receiving a Counter Check Response message sent by the UE, acquires the SN information for performing current service communication with the UE from the Counter Check Response message.
Preferably, the target base station recovers and executes the uplink and downlink services of the UE according to the acquired SN information for performing the current service communication with the UE, and specifically includes:
the RRC entity in the target base station sends the SN information used for carrying out current service communication with the UE to the PDCP entity;
and the PDCP entity in the target base station recovers and executes the uplink and downlink services of the UE according to the SN information.
For example, when an uplink packet and a downlink packet are transmitted between the base station and the UE, the latest SN information is carried in the packet and transmitted, so that the other party can successfully receive the packet and decrypt the packet.
Preferably, the SN information includes SN information used for performing current uplink service communication with the UE and SN information used for performing current downlink service communication with the UE. Moreover, preferably, the SN information for performing the current uplink service communication with the UE and the SN information for performing the current downlink service communication with the UE both include two parts: SN Number and HFN (Hyper Frame Number).
For example, when the UE is switched from the source base station to the target base station, if service communication is being performed between the UE and the base station, the source base station forwards the service data packet to the target base station, and after the UE is successfully switched to the target base station, if the target base station determines that SN switching fails, SN information for performing current service communication with the UE is acquired from the UE end, and at this time, the target base station can recover the ongoing service according to the SN information. Specifically, the target base station carries the acquired SN information for performing the current downlink service communication with the UE in the data packet forwarded by the source base station, and sends the SN information to the UE in cooperation with the data packet. If the target base station needs to send a new data packet to the UE after that, the target base station updates the SN information of this time according to the SN information carried when the data packet was sent last time and carries the SN information in the new data packet, for example, when the SN number used for performing downlink service communication with the UE when the data packet was sent last time is 10, the HFN is 1, the SN number carried when the data packet is sent this time is 11, the HFN is 1, and so on. Accordingly, when the UE sends an uplink data packet to the target base station, the UE needs to carry SN information for uplink service communication in the uplink data packet and send the SN information to the target base station.
It should be understood that, when the UE communicates uplink traffic with the base station, the SN information for uplink traffic communication in the PDCP entity of the UE side and the SN information for uplink traffic communication in the PDCP entity of the base station side should always be consistent; when downlink service communication is performed between the UE and the base station, SN information for downlink service communication in the PDCP entity of the UE side and SN information for downlink service communication in the PDCP entity of the base station side should be always consistent. Therefore, normal uplink and downlink service communication between the UE and the base station can be ensured.
Correspondingly, referring to fig. 4, an apparatus for processing an SN switching failure in a UE switching process according to an embodiment of the present invention includes:
an RRC entity 11 and a PDCP entity 12; wherein the content of the first and second substances,
the PDCP entity 12 is configured to, after the UE is switched from the source base station to the target base station, suspend an uplink service and a downlink service of the UE if it is determined that SN information switching for performing current service communication with the UE fails;
the RRC entity 11 is configured to obtain the SN information after the PDCP entity 12 determines that the SN information switching for performing current service communication with the UE fails;
the PDCP entity 12 is further configured to recover the execution of the uplink and downlink services of the UE according to the SN information obtained by the RRC entity 11.
Preferably, the processing device for SN switching failure in the UE switching process is a target base station for the UE switching.
Preferably, the RRC entity 11 is further configured to: sending an indication message to the PDCP entity 12 that the UE has completed handover from a source base station to the target base station;
the PDCP entity 12 determines that the SN information switching for the current service communication with the UE fails in the following manner:
after the PDCP entity 12 receives the indication message that the UE has completed the handover from the source base station to the target base station, if it is determined that the SN information for performing the current service communication with the UE, which is sent by the source base station, has not been received before, it is determined that the SN information switching fails.
Preferably, before sending the indication message that the UE has completed handover from the source base station to the target base station, the RRC entity 11 is further configured to:
receiving the SN information for performing current service communication with the UE, which is sent by the source base station of the UE, and forwarding the received SN information to the PDCP entity 12. Of course, if the RRC entity 11 does not receive the SN information for performing the current service communication with the UE, which is sent by the source base station of the UE, the SN information is not subsequently forwarded to the PDCP entity 12.
Preferably, the PDCP entity 12 is further configured to: sending an indication message of the SN information switching failure to the RRC entity 11;
when the RRC entity 11 obtains the SN information, the method is specifically configured to: after receiving the indication message indicating that the SN information switching fails, the RRC entity 11 sends a Counter Check message to the UE, and obtains the SN information from the Counter Check Response message when receiving a Counter Check Response message sent by the UE.
Preferably, the RRC entity 11 is further configured to: sending the SN information to the PDCP entity 12;
the PDCP entity 12, when recovering the execution of the uplink and downlink services of the UE according to the acquired SN information, is specifically configured to: after receiving the SN information sent by the RRC entity 11, the PDCP entity 12 recovers to execute the uplink and downlink services of the UE according to the SN information.
Preferably, the SN information includes SN information used for performing current uplink service communication with the UE and SN information used for performing current downlink service communication with the UE.
Preferably, the RRC entity 11 and the PDCP entity 12 may be implemented by a physical Device such as a processor, for example, a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable logic Device (CP L D).
Therefore, when the UE is switched from the source base station to the target base station, if the SN switching fails, the device provided in the embodiment of the present invention obtains the SN information for performing the current service communication with the UE and the SN information for performing the current downlink service communication with the UE, and recovers and executes the uplink and downlink service of the UE according to the obtained SN information for performing the current service communication with the UE and the obtained SN information for performing the current downlink service communication with the UE, thereby ensuring that the service of the UE is not interrupted and improving the user experience.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (7)

1. A processing method for SN switching failure in the switching process of User Equipment (UE) is characterized by comprising the following steps:
after the UE is switched from a source base station to a target base station, if the SN information switching failure for carrying out current service communication with the UE is determined, the target base station for UE switching suspends the uplink and downlink services of the UE;
the target base station acquires the SN information;
the target base station recovers and executes the uplink and downlink services of the UE according to the acquired SN information;
the target base station comprises a Radio Resource Control (RRC) entity and a packet data convergence layer (PDCP) entity;
the target base station of the UE determines that the SN information switching failure for the current service communication with the UE is failed in the following way:
the RRC entity sends an indication message that the UE has completed handover from a source base station to the target base station to the PDCP entity;
after receiving the indication message, the PDCP entity determines that the SN information switching fails if it is determined that SN information for performing current service communication with the UE, which is sent by the source base station, has not been received before;
the acquiring, by the target base station, the SN information specifically includes:
the PDCP entity sends an indication message of the SN information switching failure to the RRC entity;
and after receiving the indication message of the SN information switching failure, the RRC entity sends a Counter Check message to the UE, and acquires the SN information from the Counter Check Response message when receiving a Counter Check Response message sent by the UE.
2. The method according to claim 1, wherein the target base station recovers to execute the uplink and downlink services of the UE according to the acquired SN information, specifically comprising:
the RRC entity sends the SN information to the PDCP entity;
and the PDCP entity recovers and executes the uplink and downlink services of the UE according to the SN information.
3. The method according to claim 1 or 2, wherein the SN information comprises SN information for current uplink traffic communication with the UE and SN information for current downlink traffic communication with the UE.
4. A kind of handling arrangement that SN of serial number rearranges and fails in user equipment UE switching process, characterized by that, the apparatus includes: a Radio Resource Control (RRC) entity and a packet data convergence layer protocol (PDCP) entity; wherein the content of the first and second substances,
the PDCP entity is used for suspending the uplink and downlink services of the UE if the SN information switching failure for the current service communication with the UE is determined after the UE is switched from the source base station to the target base station;
the RRC entity is used for acquiring the SN information after the PDCP entity determines that the SN information switching for the current service communication with the UE fails;
the PDCP entity is also used for recovering and executing the uplink and downlink services of the UE according to the SN information acquired by the RRC entity;
the device is a target base station switched by the UE;
the RRC entity is further configured to: sending an indication message to the PDCP entity that the UE has completed handover from a source base station to the target base station;
the PDCP entity determines that the SN information switching for the current service communication with the UE fails in the following manner:
after receiving the indication message, the PDCP entity determines that the SN information switching fails if it is determined that SN information for performing current service communication with the UE, which is sent by the source base station, has not been received before.
5. The apparatus of claim 4, wherein the PDCP entity is further configured to: sending an indication message of the SN information switching failure to the RRC entity;
when the RRC entity obtains the SN information, the RRC entity is specifically configured to: and after receiving the indication message of the SN information switching failure, the RRC entity sends a Counter Check message to the UE, and acquires the SN information from the Counter Check Response message when receiving a Counter Check Response message sent by the UE.
6. The apparatus of claim 5, wherein the RRC entity is further configured to: transmitting the SN information to the PDCP entity;
the PDCP entity, when resuming the execution of the uplink and downlink services of the UE according to the acquired SN information, is specifically configured to: and after receiving the SN information sent by the RRC entity, the PDCP entity recovers and executes the uplink and downlink services of the UE according to the SN information.
7. The apparatus according to any of claims 4-6, wherein the SN information comprises SN information for performing current uplink traffic communication with the UE and SN information for performing current downlink traffic communication with the UE.
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