WO2016062012A1 - 电路域回落的方法、通信节点、系统和存储介质 - Google Patents
电路域回落的方法、通信节点、系统和存储介质 Download PDFInfo
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- WO2016062012A1 WO2016062012A1 PCT/CN2015/075550 CN2015075550W WO2016062012A1 WO 2016062012 A1 WO2016062012 A1 WO 2016062012A1 CN 2015075550 W CN2015075550 W CN 2015075550W WO 2016062012 A1 WO2016062012 A1 WO 2016062012A1
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- user equipment
- context modification
- equipment context
- request message
- base station
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- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000004891 communication Methods 0.000 title claims abstract description 37
- 230000004048 modification Effects 0.000 claims abstract description 248
- 238000012986 modification Methods 0.000 claims abstract description 248
- 230000004044 response Effects 0.000 claims abstract description 98
- 230000011664 signaling Effects 0.000 claims description 11
- 238000012545 processing Methods 0.000 description 13
- 230000003993 interaction Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
- H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
Definitions
- the present invention relates to information processing in the field of communications, and in particular, to a Circuit Switched Fallback (CSFB) method, a communication node, a system, and a storage medium.
- CSFB Circuit Switched Fallback
- a user equipment UE may initiate a CSFB process due to a certain need (such as making a call) and fall back to the 3G/2G network.
- a certain need such as making a call
- the normal flow of CSFB is:
- the UE first sends an Extended Service Request (NAS layer signaling) to the MME;
- NAS layer signaling NAS layer signaling
- the Mobility Management Entity sends a User Equipment Context Modification Request UE Context Modification Request message to the Evolved Base Station eNB and indicates CSFB in the signaling; after receiving the message, the eNB sends the user equipment to the MME.
- the context modification responds to the UE Context Modification Response message; the eNB sends a radio resource control connection release message to the UE, releases the X2 interface connection between the UE and the source base station, and instructs the UE to fall back to the designated 3G/2G network in the message;
- the UE context of the port is released.
- FIG. 1 When the UE sends the CSFB when performing the X2 interface switching, the processing flow in the prior art is as shown in FIG. 1: specifically:
- the user equipment UE sends a measurement report to the source eNB; typically the measurement report may include various measurements and the like indicating channel quality.
- the source eNB performs a handover decision of the X2 interface handover according to the measurement result in the measurement report message.
- the target side eNB will receive the X2 interface switching request message sent by the source eNB.
- the extended service request extended service request message is sent to the MME; the extended service request message is NAS layer signaling, and includes a request for CSFB request.
- the source eNB After receiving the handover response message, the source eNB sends a radio resource connection reconfiguration message to the UE; and indicates that the user equipment completes the handover action.
- the MME After receiving the Extended Service Request message of the source eNB, the MME sends a user equipment context modification request message to the source eNB; and the source eNB finds that the UE is performing X2 interface switching, and the CSFB should be performed after the handover is completed, and then sends the user equipment context to the MME. Modify the failure message.
- the user equipment context modification failure message may include a reason for the failure, such as indicating that the UE is performing an X2 interface handover.
- the source eNB also sends a sequence number status transmission message to the target base station during the execution of the X2 interface handover procedure.
- the user equipment will send an RRC Connection Reconfiguration Complete message to the target eNB after completing the RRC connection reconfiguration.
- the target eNB After receiving the RRC connection reconfiguration complete message, the target eNB sends a path switch request Path Switch Request message to the MME.
- the MME receives the source eNB user equipment context modification request failure message, and after receiving the path switch request message sent by the target eNB, determines the target eNB of the X2 interface handover, and sends a user equipment context modification request message to the target eNB.
- the serving gateway S-GW After the downlink data path is switched to the target eNB, the serving gateway S-GW sends one or more end identification data packets to the source eNB on the old path, and the source eNB sends the end identifier to the target eNB. If the target eNB has not received the end identifier yet, it needs to wait for the end identifier to be received before performing CSFB. Otherwise, the service data of the user is lost and the user experience is affected. Therefore, in the prior art, before the X2 interface handover is completed, the CSFB is requested to be executed, and the target base station sends a context modification request failure message and indicates that the failure is caused by the X2 interface handover being performed.
- the MME After receiving the user equipment context modification message message, the MME starts timing processing. When the timer expires, the user equipment is retransmitted to the target eNB as a modification request message.
- the context modification response message is sent to the MME based on the user terminal up and down as a modification request. Then, the RRC connection release message is sent to the user equipment, and the user equipment context release request message is sent to the MME.
- the MME replies with the user equipment context release command, and the target eNB sends a user equipment context release complete message to the MME to complete the CSFB.
- three user equipment context modification request messages and their response messages are sent and received between the MME and the base station, which may cause problems such as the length of execution of the circuit domain fallback, which may cause the user to take a long time after dialing. Turn on and make a voice call.
- embodiments of the present invention are directed to a circuit domain fallback method, a communication node, a system, and a storage medium, which at least partially solve the problem that CSFB cannot be completed in time after the user dials due to CSFB switching, thereby causing An issue that is prolonged while waiting for a call.
- Embodiments of the present invention provide a method for circuit domain fallback.
- the method includes:
- a storage operation when the target base station receives the user equipment context modification request message sent by the MME before receiving the end identifier, storing the user equipment context modification request message or the user equipment context formed based on the user equipment context modification request message Modify the response message;
- the target base station is a target base station that performs X2 interface handover.
- Send operations include:
- the storage operation includes:
- the user equipment context modification response message is stored.
- the storing step is:
- the user equipment context modification request message or the storage user equipment context modification response message is stored in the S1 signaling memory.
- the embodiment of the invention provides a method for circuit domain fallback, the method comprising:
- the user equipment receiving the user equipment context modification response message returned according to the user equipment context modification request message is modified on the premise that the user equipment context modification request message is not timed.
- the embodiment of the invention provides a method for circuit domain fallback, the method comprising:
- the target base station stores the user equipment context modification request message or the user equipment context modification response formed based on the user equipment context modification request message when receiving the user equipment context modification request message sent by the MME before receiving the end identifier.
- the target base station After receiving the end identifier, the target base station sends a user equipment context modification response message formed based on the user equipment context modification request message to the MME;
- the MME after receiving the resending user equipment context modification request message, receives the user equipment context modification response message returned by the target base station according to the user equipment context modification request message to modify the user equipment;
- the target base station is a target base station that performs X2 interface handover.
- An embodiment of the present invention provides a communication node, where the communication node is a target base station that performs X2 interface switching;
- the target base station includes:
- a storage unit configured to: when the target base station receives the user equipment context modification request message sent by the MME before receiving the end identifier, storing the user equipment context modification request message or the user formed based on the user equipment context modification request message Device context modification response message;
- a first sending unit configured to send, after receiving the end identifier, a user equipment context modification response message formed by the user equipment context modification request message to the MME;
- the target base station is a target base station that performs X2 interface handover.
- the storage unit is configured to store the user equipment context modification request message
- the first sending unit includes:
- a first forming module configured to form the user equipment context modification response message according to the stored user equipment context modification request message after receiving the end identifier
- a sending module configured to send the user equipment context modification response message to the MME.
- the storage unit includes:
- a second forming module configured to: after receiving the user equipment context request modification message, Forming, according to the user equipment context request modification message, the user equipment context modification response message;
- the storage module is configured to store the user equipment up and down response message.
- the storage unit is configured to store the user equipment context modification request message or the storage user equipment context modification response message in an S1 signaling memory.
- An embodiment of the present invention provides a communication node, where the communication node is an MME;
- the MME includes:
- a second sending unit configured to send a user equipment context modification request message to the target base station
- the second receiving unit is configured to: after receiving the resend user equipment context modification request message, receive the user equipment to modify the user equipment according to the user equipment context modification response message returned by the user equipment context modification request message.
- An embodiment of the present invention provides a communication system, where the communication system includes:
- the MME is configured to send a user equipment context modification request message to the target base station;
- the target base station is configured to: when receiving the user equipment context modification request message sent by the MME, storing the user equipment context modification request message or the user equipment formed based on the user equipment context modification request message Context modification response message;
- the target base station is further configured to: after receiving the end identifier, send a user equipment context modification response message formed by the user equipment context modification request message to the MME;
- the MME is further configured to receive, according to the premise of not resending the user equipment context modification request message, the user equipment context modification response message returned by the target base station based on the user equipment context modification request message;
- the target base station is performing X2 The target base station for interface switching.
- the computer storage medium further stores computer executable instructions, and the computer executable instructions are used to execute at least one of the foregoing method for circuit domain fallback.
- the target base station receives the user equipment context modification request message sent by the MME before receiving the end identifier, and does not directly reply to the user equipment context modification failure message to trigger
- the MME performs timing and user equipment context modification request message retransmission processing, and stores the user equipment context modification request or forms a user equipment context modification response message based on the user equipment context modification request, and then stores the end identifier.
- the MME sends a user equipment context modification response message; thus, the MME does not perform timing and retransmission processing, and reduces the number of CSFB message interactions and data amount between the target base station and the MME, and the target base station can timely report to the end base station after receiving the end identifier.
- the MME sends a user equipment context modification response message, which speeds up the processing speed of the CSFB, shortens the processing time of the CSFB, and reduces the delay of the user equipment after the dialing to the call, thereby improving the response speed and user satisfaction.
- FIG. 1 is a schematic diagram of a process of performing CSFB when an X2 interface is switched
- FIG. 2 is a schematic flowchart of a method for circuit domain fallback according to an embodiment of the present invention
- FIG. 3 is a second schematic flowchart of a method for falling back a circuit domain according to an embodiment of the present invention.
- FIG. 4 is a third schematic flowchart of a method for falling back a circuit domain according to an embodiment of the present invention.
- FIG. 5 is a fourth schematic flowchart of a method for falling back a circuit domain according to an embodiment of the present invention.
- FIG. 6 is a fifth schematic flowchart of a method for falling back a circuit domain according to an embodiment of the present invention.
- FIG. 7 is a schematic structural diagram of a target base station according to an embodiment of the present invention.
- FIG. 8 is a schematic structural diagram of an MME according to an embodiment of the present invention.
- FIG. 9 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
- FIG. 10 is a schematic flow chart of a method for circuit domain fallback according to an example of the present invention.
- the method for the circuit domain fallback described in the embodiment of the present application when receiving the user equipment context modification message that is sent by the MME, including the CSFB, does not immediately send the user equipment context modification failure message to the MME, but the user equipment.
- the context modification message stores or stores a context modification response message formed based on the context modification message, and after receiving the end flag, sends a user equipment context modification response message according to the user equipment context modification message to the MME. Therefore, after receiving the end identifier, the target base station can trigger the formation of the user equipment context modification response message and send it to the MME without the MME resending the user equipment context modification message.
- Embodiment 1 is a diagrammatic representation of Embodiment 1:
- this embodiment provides a method for circuit domain fallback, where the method includes:
- the storage operation S110 when the target base station receives the user equipment context modification request message sent by the MME before receiving the end identifier, storing the user equipment context modification request message or the user equipment formed based on the user equipment context modification request message Context modification response message;
- Sending operation S120 after receiving the end identifier, sending, to the MME, a user equipment context modification response message formed based on the user equipment context modification request message;
- the target base station is a target base station that performs X2 interface handover.
- the target base station performing the X2 interface switching does not immediately receive the user equipment context modification message including the CSFB sent by the MME before receiving the end identifier before receiving the end identifier.
- Sending a user equipment context modification failure message to the MME, and indicating that the X2 interface is currently being cut in the user equipment context modification failure message Transmitting; the user equipment context modification message is stored, and after receiving the end flag in step S120, the user equipment context modification response message is sent to the MME according to the user equipment context modification message;
- the eNB may trigger the formation of the user equipment context modification response message and send it to the MME without the MME resending the user equipment context modification message.
- the CSFB loop processing time is reduced; the reason is that in the prior art, after the target base station sends a user equipment context modification failure message to the MME, the MME will start the retransmission timing processing, and will not re-route to the target base station after the timer expires.
- the target base station immediately receives the user equipment context modification request message, and the target base station also needs time to receive and parse the user equipment context modification request message, and then form the user equipment context modification.
- the response message obviously has a larger delay than the first scheme and the second scheme in the embodiment of the method, which may cause the user to take a long time to make a call after the voice dialing. There is no similar problem with the two technical solutions provided by this embodiment.
- the method includes:
- Step S110 When the target base station receives the user equipment context modification request message sent by the MME before receiving the end identifier, storing the user equipment context modification request message;
- Step S121 After receiving the end identifier, forming the user equipment context modification response message according to the stored user equipment context modification request message;
- Step S122 Send the user equipment context modification response message to the MME.
- Step S111 When the target base station receives the user equipment context modification request message sent by the MME before receiving the end identifier, after receiving the user equipment context request modification message, modifying the message according to the user equipment context request to form the User equipment context modification response message;
- Step S112 storing the user equipment context modification response message
- Step S120 After receiving the end identifier, send the user equipment context modification response message to the MME.
- the solution 2 after receiving the user equipment context modification request message, forms the user equipment context modification response message and the stored user equipment context modification response message, so the transmission is formed immediately after receiving the end identifier.
- the user equipment context modification response message can further reduce the CSFB delay and improve the response speed.
- the storing step is: storing the user equipment context modification request message or the storage user equipment context modification response message in an S1 signaling memory.
- the S1 signaling memory is a signaling memory No. 1.
- the present embodiment provides a method for improving the response rate of CSFB when the UE performs X2 interface switching.
- Embodiment 2 is a diagrammatic representation of Embodiment 1:
- the embodiment provides a method for a circuit domain to fall back to CSFB, where the method includes:
- Step S210 Send a user equipment context modification request message to the target base station
- Step S220 Receive a user equipment context modification response message returned by the target base station based on the user equipment context modification request message, without pre-sending the user equipment context modification request message.
- the MME After receiving the context modification response message, the MME further receives the user equipment context release request message and the like sent by the target base station.
- Embodiment 3 is a diagrammatic representation of Embodiment 3
- the embodiment provides a method for circuit area falling back CSFB, and the method includes:
- Step S310 The MME sends a user equipment context modification request message to the target base station.
- Step S320 The target base station stores the user equipment context modification request message or the user equipment formed based on the user equipment context modification request message when receiving the user equipment context modification request message sent by the MME before receiving the end identifier.
- Context modification response message
- Step S330 After receiving the end identifier, the target base station sends a user equipment context modification response message formed based on the user equipment context modification request message to the MME.
- Step S340 The MME, after receiving the retransmission context modification request message, receives the user equipment context modification response message returned by the target base station according to the user equipment context modification request message to modify the user equipment.
- the target base station is a target base station that performs X2 interface handover.
- the MME does not receive the context modification failure message that the target base station temporarily fails to perform CSFB due to the X2 interface switching, and the MME does not perform timing processing after receiving the context modification failure message.
- Retransmitting the context modification request message to the target base station according to the timing obviously this reduces the number of information interactions and the amount of data between the MME and the target base station, and can form a context modification response message in time for the target base station and Sending can reduce CSFB processing delay and improve CSFB response speed.
- Embodiment 4 is a diagrammatic representation of Embodiment 4:
- the embodiment provides a communication node, where the communication node is a target base station that performs X2 interface switching, and the target base station includes:
- the storage unit 110 is configured to: when the target base station receives the user equipment context modification request message sent by the MME, before receiving the end identifier, storing the user equipment context modification request message or forming according to the user equipment context modification request message User equipment context modification response message;
- the first sending unit 120 is configured to: after receiving the end identifier, send a user equipment context modification response message formed by the user equipment context modification request message to the MME;
- the target base station is a target base station that performs X2 interface handover.
- the storage unit 110 specifically includes a storage medium, such as a storage medium such as a ROM or a flash or a mobile hard disk.
- the specific structure of the first sending unit 120 may include multiple communication interfaces, such as a communication interface such as a transceiver antenna.
- the first type the storage unit 110 is configured to store the user equipment context modification request message
- the first sending unit includes: a first forming module, configured to form the user equipment context modification response message according to the stored user equipment context modification request message after receiving the end identifier; and sending a module, configuring The user equipment context modification response message is sent to the MME.
- the storage unit includes:
- a second forming module configured to form a user equipment context modification response message according to the user equipment context request modification message after receiving the user equipment context request modification message;
- the storage module is configured to store the user equipment up and down response message.
- the specific structure of the first forming module and the second forming module in this embodiment may include a processor, and the processor forms the foregoing by triggering the context modification request message by running a pre-stored executable instruction.
- the context modification response message informs the MME that the target base station has received the context modification request, and sends a radio resource control connection release request message to the user equipment to cause the user equipment to fall back.
- the storage unit 110 is configured to store the user equipment context modification request message or the storage user equipment context modification response message in the S1 signaling memory.
- the embodiment provides the implementation hardware for the method in the first embodiment, and has the advantages of reducing the number of information interaction between the target base station and the MME and increasing the CSFB response rate.
- Embodiment 5 is a diagrammatic representation of Embodiment 5:
- this embodiment provides a communication node, the communication node is an MME;
- the MME includes:
- the second sending unit 210 is configured to send a user equipment context modification request message to the target base station;
- the second receiving unit 220 is configured to: after receiving the resend user equipment context modification request message, receive the user equipment to modify the user equipment according to the user equipment context modification response message returned by the user equipment context modification request message.
- the second sending unit 210 can be a wired or wireless sending interface, such as a cable sending interface.
- the second receiving unit 220 can also be a wired or wireless receiving interface, such as a cable receiving antenna or the like.
- the communication interface integrates the second sending unit 210 and the second receiving unit 220.
- the MME described in this embodiment is a communication node that performs the method described in the second embodiment.
- the beneficial effects of the MME are as described in the second embodiment, and are not repeated here.
- the embodiment provides a communication system, where the communication system includes:
- the MME 310 is configured to send a user equipment context modification request message to the target base station;
- the target base station 320 is configured to store the user equipment context modification request message or the user formed based on the user equipment context modification request message when receiving the user equipment context modification request message sent by the MME before receiving the end identifier.
- Device context modification response message ;
- the target base station 320 is further configured to: after receiving the end identifier, send a user equipment context modification response message formed by the user equipment context modification request message to the MME;
- the MME 310 is further configured to: after receiving the retransmission context modification request message, receive the context modification response message returned by the target base station according to the context modification request message to modify the user equipment;
- the target base station 320 is a target base station 320 that performs X2 interface switching.
- the target base station 320 and the MME For the specific structure of the target base station 320 and the MME, reference may be made to the fourth embodiment and the fifth embodiment, and the description of the specific hardware structure of the target base station 320 and the MME may be referred to in the prior art.
- the source system and the user equipment UE are further included in the communication system;
- the source base station is a forming base station of the cell camped before the user equipment switches.
- the communication system in this embodiment is used to provide the implementation hardware for the method in the third embodiment of the method, and has the advantages of small processing delay and fast response speed.
- the embodiment of the present application further provides a computer storage medium, where the computer storage medium stores computer executable instructions, where the computer executable instructions are used to execute at least one of the methods described in the foregoing embodiments, specifically 2 to at least one of the methods shown in FIG. 6 and FIG.
- the computer storage medium in this embodiment may be a dynamic storage device, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like.
- the medium of the computer storage medium in the embodiment may be a non-transitory storage medium; conveniently storing the program code stably.
- the target eNB when the target eNB receives the user equipment context modification request before receiving the end identifier, the user equipment context modification failure message will be sent to the MME, and in FIG. 10, the target eNB will store the user equipment context request. a message; after receiving the user equipment context modification failure message sent by the target base station in FIG. 1, the MME will start the handover complete timer and wait for the timeout to resend the user equipment context modification request message to the target eNB; The MME does not initiate the handover complete timer and does not resend the user equipment context modification request message. Structurally, the MME reduces a timer, which simplifies the structure of the MME; does not retransmit the user equipment context. Modifying the request message obviously reduces the number of message interactions between the MME and the target base station.
- the target base station after receiving the end identifier, the target base station needs to send the user equipment context modification response message to the MME after the MME retransmits the user equipment context modification request message, and in FIG. 10, the target eNB receives the end identifier. After that, it will be based on the stored user device
- the request message directly sends a user equipment context modification response message to the MME; obviously, the processing delay of the CSFB can be shortened, and the response speed of the CSFB is improved.
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Abstract
本发明公开了一种电路域回落的方法、通信节点及系统，所述方法包括：存储操作：当目标基站在接收到结束标识之前，接收到移动管理实体MME发送的用户设备上下文修改请求消息时，存储所述用户设备上下文修改请求消息或基于所述上下文修改请求消息形成的用户设备上下文修改响应消息；发送操作：在接收到所述结束标识后，向所述MME发送基于所述上下文修改请求消息形成的上下文修改响应消息；其中，所述目标基站为进行X2接口切换的目标基站。本发明还同开了一种计算机存储介质。
Description
本发明涉及通信领域的信息处理，尤其涉及一种电路域回落(Circuit Switched Fallback,CSFB)的方法、通信节点、系统和存储介质。
目前，在长期演进(Long Term Evolution，LTE)系统中，用户设备UE可能会由于某种需要(比如拨打电话)而发起CSFB流程，回落到3G/2G网络。通常CSFB的正常流程是：
UE首先向MME发送Extended Service Request(NAS层信令)；
移动管理实体(Mobility Management Entity，MME)收到消息后，向演进型基站eNB发送用户设备上下文修改请求UE Context Modification Request消息并在信令中指示CSFB；eNB收到消息后，向MME发送用户设备上下文修改响应UE Context Modification Response消息；eNB向UE发无线资源控制连接释放消息，释放UE与源基站之间的X2接口连接，并在消息中指示UE回落到指定的3G/2G网络；再进行S1口的UE上下文释放。
当UE在进行X2接口切换时发送CSFB，现有技术中的处理流程如图1所示：具体包括：
用户设备UE向源eNB发送测量报告；通常所述测量报告可包含指示信道质量的各测量结果等。
源eNB依据所述测量报告消息中的测量结果，进行X2接口切换的切换判决。
若判断结果为进行切换，则目标侧eNB将接收到源eNB发送的X2接口切换请求消息。在图1中，若此时用户设备因为业务需要发起CSFB流程，将
会向MME发送拓展服务请求Extended Service Request消息；所述Extended Service Request消息为NAS层信令，包括了请求进行CSFB的请求。
目标侧eNB基于所述切换请求消息向源eNB并发送的切换响应消息；
源eNB在接收到所述切换响应消息之后，向UE发送无线资源连接重配置消息；指示用户设备完成切换动作。
MME收到源eNB的Extended Service Request消息之后，向源eNB发送用户设备上下文修改请求消息；而源eNB发现UE正在进行X2接口切换，而CSFB应该在切换完成后进行，于是向MME发送用户设备上下文修改失败消息。通常所述用户设备上下文修改失败消息会包括失败的原因，如说明UE正在进行X2接口切换。
源eNB在执行X2接口切换过程中，还会向目标基站发送序列号状态传输消息。用户设备将在完成RRC连接重配置之后，向目标eNB发送RRC连接重配置完成消息。
目标eNB接收RRC连接重配置完成消息后，向MME发送路径切换请求Path Switch Request消息。
MME接收到源eNB用户设备上下文修改请求失败消息，并在接收到目标eNB发送的路径切换请求消息后，确定了X2接口切换的目标eNB，并向目标eNB发送用户设备上下文修改请求消息。
下行数据路径切换到目标eNB后，服务网关S-GW会在旧路径上发送一个或者多个结束标识数据包到源eNB，源eNB再将结束标识发送给目标eNB。若目标eNB当前还未接收到结束标识，需要等待接收到结束标识之后再进行CSFB，否则会导致用户的业务数据丢失，而影响用户体验。故在现有技术中，在X2接口切换尚未完成之前，请求执行CSFB，目标基站会发送上下文修改请求失败消息并指示失败的原因为正在进行X2接口切换。
MME接收到所述用户设备上下文修改消息消息后，将启动计时处理，
在计时器失效时，向目标eNB重发所述用户设备上下为修改请求消息。
若当前目标eNB已接收到所述结束标记，则将基于用户终端上下为修改请求向MME发送上下文修改响应消息。然后向用户设备发送RRC连接释放消息，同时向MME发送用户设备上下文释放请求消息，MME回复用户设备上下文释放命令，目标eNB再给MME发送用户设备上下文释放完成消息，完成CSFB。
显然MME与基站之间发生了三次用户设备上下文修改请求消息及其响应消息的发送和接收，这将导致电路域回落执行时长大等问题，进而导致用户在拨号后，需要较长的时间才能进行接通并进行语音通话。
发明内容
有鉴于此，本发明实施例期望提供一种电路域回落的方法、通信节点、系统和存储介质，至少部分解决因CSFB发生在X2接口切换时，导致的用户拨号后无法及时完成CSFB，进而造成等待通话时延长的问题。
本发明的技术方案是这样实现的：
本发明实施例提供一种电路域回落的方法，
所述方法包括：
存储操作：当目标基站在接收到结束标识之前，接收到MME发送的用户设备上下文修改请求消息时，存储所述用户设备上下文修改请求消息或基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
发送操作：在接收到所述结束标识后，向所述MME发送基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
其中，所述目标基站为进行X2接口切换的目标基站。
可选地，
当所述存储操作包括存储所述用户设备上下文修改请求消息时，所述
发送操作包括：
在接收到所述结束标识后，依据存储的所述用户设备上下文修改请求消息形成所述用户设备上下文修改响应消息；
向所述MME发送所述上下文修改响应消息。
可选地，
所述存储操作包括：
在接收所述用户设备上下文请求修改消息后，依据所述用户设备上下文请求修改消息形成所述用户设备上下文修改响应消息；
存储所述用户设备上下文修改响应消息。
可选地，
所述存储步骤为：
将所述用户设备上下文修改请求消息或存储用户设备上下文修改响应消息存储在S1信令存储器中。
本发明实施例提供一种电路域回落的方法，所述方法包括：
向目标基站发送用户设备上下文修改请求消息；
在不计时重发用户设备上下文修改请求消息的前提下，接收所述目标基站基于所述用户设备上下文修改请求消息返回的用户设备上下文修改响应消息修改。
本发明实施例提供一种电路域回落的方法，所述方法包括：
MME向目标基站发送用户设备上下文修改请求消息；
目标基站在接收到结束标识之前，接收到MME发送的所述用户设备上下文修改请求消息时，存储所述用户设备上下文修改请求消息或基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
所述目标基站在接收到所述结束标识后，向所述MME发送基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
所述MME在不计时重发用户设备上下文修改请求消息的前提下，接收所述目标基站基于所述用户设备上下文修改请求消息返回的用户设备上下文修改响应消息修改用户设备；
其中，所述目标基站为进行X2接口切换的目标基站。
本发明实施例提供一种通信节点，所述通信节点为进行X2接口切换的目标基站；
所述目标基站包括：
存储单元，配置为当目标基站在接收到结束标识之前，接收到MME发送的用户设备上下文修改请求消息时，存储所述用户设备上下文修改请求消息或基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
第一发送单元，配置为在接收到所述结束标识后，向所述MME发送基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
其中，所述目标基站为进行X2接口切换的目标基站。
可选地，
所述存储单元，配置为存储所述用户设备上下文修改请求消息；
所述第一发送单元包括：
第一形成模块，配置为在接收到所述结束标识后，依据存储的所述用户设备上下文修改请求消息形成所述用户设备上下文修改响应消息；
发送模块，配置为向所述MME发送所述用户设备上下文修改响应消息。
可选地，
所述存储单元包括：
第二形成模块，配置为在接收所述用户设备上下文请求修改消息后，
依据所述用户设备上下文请求修改消息形成所述用户设备上下文修改响应消息；
存储模块，配置为存储所述用户设备上下响应消息。
可选地，
所述存储单元，配置为将所述用户设备上下文修改请求消息或存储用户设备上下文修改响应消息存储在S1信令存储器中。
本发明实施例提供一种通信节点，所述通信节点为MME；
所述MME包括：
第二发送单元，配置为于向目标基站发送用户设备上下文修改请求消息；
第二接收单元，配置为在不计时重发用户设备上下文修改请求消息的前提下，接收所述目标基站基于所述用户设备上下文修改请求消息返回的用户设备上下文修改响应消息修改用户设备。
本发明实施例提供一种通信系统，所述通信系统包括：
MME，配置为向目标基站发送用户设备上下文修改请求消息；
目标基站，配置为在接收到结束标识之前，接收到MME发送的所述用户设备上下文修改请求消息时，存储所述用户设备上下文修改请求消息或基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
所述目标基站，还配置为在接收到所述结束标识后，向所述MME发送基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
所述MME，还配置为在不计时重发用户设备上下文修改请求消息的前提下，接收所述目标基站基于所述用户设备上下文修改请求消息返回的用户设备上下文修改响应消息；修改用户设备其中，所述目标基站为进行X2
接口切换的目标基站。
本发明实施例还所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行上述电路域回落的方法的至少其中之一。
本发明实施例所述的CSFB方法通信节点、系统和存储介质，目标基站在未接收到结束标识之前，接收到MME发送的用户设备上下文修改请求消息，不直接回复用户设备上下文修改失败消息来触发MME进行计时及用户设备上下文修改请求消息重发处理，而是将所述用户设备上下文修改请求存储或基于用户设备上下文修改请求形成用户设备上下文修改响应消息后存储起来，待收到结束标识后向MME发送用户设备上下文修改响应消息；这样MME不用进行计时及重发处理，减少了目标基站与MME之间的进行CSFB的消息交互次数及数据量，且目标基站能在接收到结束标识之后及时向MME发送用户设备上下文修改响应消息，加速了CSFB的处理速度，缩短了CSFB的处理时间，从能减少用户设备在拨号后到可进行通话的时延，提高了响应速度及用户使用满意度。
图1为一种在X2接口切换时进行CSFB的流程示意图；
图2为本发明实施例所述电路域回落的方法的流程示意图之一；
图3为本发明实施例所述电路域回落的方法的流程示意图之二；
图4为本发明实施例所述电路域回落的方法的流程示意图之三；
图5为本发明实施例所述电路域回落的方法的流程示意图之四；
图6为本发明实施例所述电路域回落的方法的流程示意图之五；
图7为本发明实施例所述目标基站的结构示意图；
图8为本发明实施例所述MME的结构示意图；
图9为本发明实施例所述通信系统的结构示意图；
图10为本发明示例所述电路域回落的方法的流程示意图。
以下结合附图对本发明的优选实施例进行详细说明，应当理解，以下所说明的优选实施例仅用于说明和解释本发明，并不用于限定本发明。
本申请实施例中所述的电路域回落的方法，在接收到MME发送的包括进行CSFB的用户设备上下文修改消息时，不会立即向MME发送用户设备上下文修改失败消息，而是将该用户设备上下文修改消息存储起来或存储基于所述上下文修改消息形成的上下文修改响应消息，并在接收到所述结束标志之后，再将依据所述用户设备上下文修改消息形成用户设备上下文修改响应消息发送给MME；从而目标基站在接收到结束标识后，无需MME重发所述用户设备上下文修改消息的情况下，就能自行触发形成所述用户设备上下文修改响应消息并向MME发送。具体的详细描述可以参见下列实施例。
实施例一：
如图2所示，本实施例提供一种电路域回落的方法，所述方法包括：
存储操作S110：当目标基站在接收到结束标识之前，接收到MME发送的用户设备上下文修改请求消息时，存储所述用户设备上下文修改请求消息或基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
发送操作S120：在接收到所述结束标识后，向所述MME发送基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
其中，所述目标基站为进行X2接口切换的目标基站。
在本实施例中相较于现有的电路域回落方法，进行X2接口切换的目标基站在未接收到结束标识之前，接收到MME发送的包括进行CSFB的用户设备上下文修改消息时，不会立即向MME发送用户设备上下文修改失败消息，并在该用户设备上下文修改失败消息内说明当前正在进行X2接口切
换；而是将该用户设备上下文修改消息存储起来，并在步骤S120中接收到所述结束标志之后，再将依据所述用户设备上下文修改消息形成用户设备上下文修改响应消息发送给MME；从而目标基站在接收到结束标识后，无需MME重发所述用户设备上下文修改消息的情况下，就能自行触发形成所述用户设备上下文修改响应消息并向MME发送。
本实施例所述方法这样做的好处是：
第一：减少了目标基站与MME之间的信息交互次数；
第二：减少了CSFB回路处理时长；理由是在现有技术中当目标基站向MME发送用户设备上下文修改失败消息后，MME将启动重发计时处理，在计时器失效以后才会重新向目标基站发送用户设备上下文修改请求消息，而此时目标基站可能早已接收到了X2接口切换的结束标识，却没有用户设备上下文修改请求消息的触发以尽早结束CSFB的后续步骤，从而导致时延大；且即便目标基站在其接收到X2接口切换的结束标识后，立即接到用户设备上下文修改请求消息，同样目标基站还需要有时间来接收并解析用户设备上下文修改请求消息，再形成所述用户设备上下文修改响应消息，显然相对于本方法实施例中的方案一和方案二的时延更大一些，从而会导致用户在进行语音拨号后，需要较长的时间才能进行通话。显采用本实施例提供的两个技术方案就不会有类似的问题。
其中，所述方法至少包括以下两个技术方案：
方案一：
如图3所示，所述方法包括：
步骤S110：当目标基站在接收到结束标识之前，接收到MME发送的用户设备上下文修改请求消息时，存储所述用户设备上下文修改请求消息；
步骤S121：在接收到所述结束标识后，依据存储的所述用户设备上下文修改请求消息形成所述用户设备上下文修改响应消息；
步骤S122：向所述MME发送所述用户设备上下文修改响应消息。
方案二：
步骤S111：当目标基站在接收到结束标识之前，接收到MME发送的用户设备上下文修改请求消息时，在接收所述用户设备上下文请求修改消息后，依据所述用户设备上下文请求修改消息形成所述用户设备上下文修改响应消息；
步骤S112：存储所述用户设备上下文修改响应消息；
步骤S120：在接收到所述结束标识后，向所述MME发送所述用户设备上下文修改响应消息。
所述方案二由于在接收到所述用户设备上下文修改请求消息后，将形成所述用户设备上下文修改响应消息，存储的用户设备上下文修改响应消息，故在接收到结束标识后立即发送已形成好的用户设备上下文修改响应消息，能够进一步降低CSFB的时延，提高响应速度。
可选地，所述存储步骤为：将所述用户设备上下文修改请求消息或存储用户设备上下文修改响应消息存储在S1信令存储器中。所述S1信令存储器为1号信令存储器。
综合上述，本实施例提供了一种方法，能够提高在UE进行X2接口切换时，CSFB的响应速率。
实施例二：
如图5所示，本实施例提供一种电路域回落CSFB的方法，所述方法包括：
步骤S210：向目标基站发送用户设备上下文修改请求消息；
步骤S220：在不计时重发用户设备上下文修改请求消息的前提下，接收所述目标基站基于所述用户设备上下文修改请求消息返回的用户设备上下文修改响应消息。
修改用户设备在本实施例中所述MME不会进行计时，及基于计时中计时器失效后向目标基站重发所述用户设备上下文修改请求消息，这样可以减少MME与目标基站之间的信息交互以及CSFB处理的时延。
在MME接收到所述上下文修改响应消息之后，所述MME还将接收到目标基站发送的用户设备上下文释放请求消息等。
实施例三：
如图6所示，本实施例提供一种电路域回落CSFB的方法，所述方法包括：
步骤S310：MME向目标基站发送用户设备上下文修改请求消息；
步骤S320：目标基站在接收到结束标识之前，接收到MME发送的所述用户设备上下文修改请求消息时，存储所述用户设备上下文修改请求消息或基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
步骤S330：所述目标基站在接收到所述结束标识后，向所述MME发送基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
步骤S340：所述MME在不计时重发上下文修改请求消息的前提下，接收所述目标基站基于所述用户设备上下文修改请求消息返回的用户设备上下文修改响应消息修改用户设备
其中，所述目标基站为进行X2接口切换的目标基站。
显然本实施例所述方法中，MME不会接收到目标基站因在进行X2接口切换导致CSFB暂时无法进行的上下文修改失败消息，MME也不会在接收到上下文修改失败消息之后，进行计时处理及依据计时向目标基站重发上下文修改请求消息；显然这减少了MME与目标基站之间的信息交互次数和数据量，且能因目标基站能够及时形成上下文修改响应消息并向MME
发送，能减少CSFB处理时延，提高CSFB的响应速度。
实施例四：
如图7所示，本实施例提供一种通信节点，，所述通信节点为进行X2接口切换的目标基站；所述目标基站包括：
存储单元110，配置为当目标基站在接收到结束标识之前，接收到MME发送的用户设备上下文修改请求消息时，存储所述用户设备上下文修改请求消息或基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
第一发送单元120，配置为在接收到所述结束标识后，向所述MME发送基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
其中，所述目标基站为进行X2接口切换的目标基站。
所述存储单元110具体包括存储介质，具体如ROM或flash或移动硬盘等存储介质。
所述第一发送单元120的具体结构可包括多种通信接口，具体如收发天线等通信接口。
以下对照实施例一中所述目标基站的CSFB方法，提供两种目标基站的结构：
第一种：所述存储单元110，配置为存储所述用户设备上下文修改请求消息；
所述第一发送单元包括：第一形成模块，配置为在接收到所述结束标识后，依据存储的所述用户设备上下文修改请求消息形成所述用户设备上下文修改响应消息；及发送模块，配置为向所述MME发送所述用户设备上下文修改响应消息。
第二种：
所述存储单元包括：
第二形成模块，配置为在接收所述用户设备上下文请求修改消息后，依据所述用户设备上下文请求修改消息形成所述用户设备上下文修改响应消息；
存储模块，配置为存储所述用户设备上下响应消息。
本实施例中所述第一形成模块和第二形成模块的具体结构可包括处理器，所述处理器通过运行预先存储的可执行指令，在所述上下文修改请求消息的触发下，形成所述上下文修改响应消息，告知MME目标基站已经接收到了所述上下文修改请求，将向用户设备发送无线资源控制连接释放请求消息，以使用户设备回落。
可选地，所述存储单元110，配置为将所述用户设备上下文修改请求消息或存储用户设备上下文修改响应消息存储在S1信令存储器中。
综合上述，本实施例为方法实施例一所述的方法提供了实现硬件，同样的具有能够减少目标基站与MME之间信息交互的次数及提高CSFB响应速率的优点。
实施例五：
如图8所示，本实施例提供一种通信节点，所述通信节点为MME；
所述MME包括：
第二发送单元210，配置为向目标基站发送用户设备上下文修改请求消息；
第二接收单元220，配置为在不计时重发用户设备上下文修改请求消息的前提下，接收所述目标基站基于所述用户设备上下文修改请求消息返回的用户设备上下文修改响应消息修改用户设备。
所述第二发送单元210可以为有线或无线的发送接口，如电缆发送接口等。
所述第二接收单元220同样可为有线或无线的接收接口，如电缆接收天线等。
在具体的实现过程中，若一个通信接口既可以用于数据接收，也可以用于数据发送，则该通信接口集成了所述第二发送单元210和第二接收单元220。
综合上述本实施例所述的MME为执行实施例二中所述方法的通信节点，具有的有益效果可参见实施例二中，在此就不再重复了。
实施例六：
如图9所示，本实施例提供一种通信系统，所述通信系统包括：
MME 310，配置为向目标基站发送用户设备上下文修改请求消息；
目标基站320，配置为在接收到结束标识之前，接收到MME发送的所述用户设备上下文修改请求消息时，存储所述用户设备上下文修改请求消息或基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
所述目标基站320，还配置为在接收到所述结束标识后，向所述MME发送基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；
所述MME 310，还配置为在不计时重发上下文修改请求消息的前提下，接收所述目标基站基于所述上下文修改请求消息返回的上下文修改响应消息修改用户设备；
其中，所述目标基站320为进行X2接口切换的目标基站320。
所述目标基站320和MME的具体结构可分别参见实施例四和实施例五，在此就不再重复说明了；所述目标基站320和所述MME的具体硬件结构可以参见现有技术中第三代通信网络或第四代通信网络中的硬件结构。
在具体实现时，所述通信系统中还将包括源基站和用户设备UE；所述
源基站为用户设备切换前所驻留小区的形成基站。
本实施例所述的通信系统用于为方法实施例三所述的方法，提供实现硬件，同样具有CSFB的处理时延小，响应速度快的优点。
本申请实施例中还提供一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行上述实施例所述方法的至少其中之一，具体如图2至图6以及图10所示方法的至少其中之一。
本实施例所述的计算机存储介质可为动存储设备、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质，在本实施例中所述计算机存储介质可为非瞬间存储介质；方便稳定存储所述程序代码。
以下图1和图10，在实施例一至实施例三所述方法的至少其中之一的基础上可知：
在图1中目标eNB在未接收到结束标识之前接收到所述用户设备上下文修改请求时，将向MME发送用户设备上下文修改失败消息，而在图10中目标eNB将存储所述用户设备上下文请求消息；在图1中MME在接收目标基站发送的用户设备上下文修改失败消息之后，将启动切换完成定时器并等到超时后向目标eNB重发所述用户设备上下文修改请求消息；而在图10中所述MME不会启动切换完成定时器且不会重发所述用户设备上下文修改请求消息，从结构上讲MME减少了一个计时器，简化了MME的结构；不会重发所述用户设备上下文修改请求消息，显然减少了MME与目标基站之间的消息交互次数。
在图1中目标基站在接收到结束标识之后，需要由MME重发用户设备上下文修改请求消息之后才会向MME发送用户设备上下文修改响应消息，而在图10中，目标eNB在接收到结束标识之后，将依据存储的用户设备上
下文请求消息直接向MME发送用户设备上下文修改响应消息；显然可以缩短CSFB的处理时延，提高CSFB的响应速度。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此。凡按照本发明原理所作的修改，都应当理解为落入本发明的保护范围。
Claims (13)
- 一种电路域回落的方法，所述方法包括：存储操作：当目标基站在接收到结束标识之前，接收到MME发送的用户设备上下文修改请求消息时，存储所述用户设备上下文修改请求消息或基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；发送操作：在接收到所述结束标识后，向所述MME发送基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；其中，所述目标基站为进行X2接口切换的目标基站。
- 根据权利要求1所述的方法，其中，当所述存储操作包括存储所述用户设备上下文修改请求消息时，所述发送操作包括：在接收到所述结束标识后，依据存储的所述用户设备上下文修改请求消息形成所述用户设备上下文修改响应消息；向所述MME发送所述上下文修改响应消息。
- 根据权利要求1所述的方法，其中，所述存储操作包括：在接收所述用户设备上下文请求修改消息后，依据所述用户设备上下文请求修改消息形成所述用户设备上下文修改响应消息；存储所述用户设备上下文修改响应消息。
- 根据权利要求1、2或3所述的方法，其中，所述存储步骤为：将所述用户设备上下文修改请求消息或存储用户设备上下文修改响应消息存储在S1信令存储器中。
- 一种电路域回落的方法，所述方法包括：向目标基站发送用户设备上下文修改请求消息；在不计时重发用户设备上下文修改请求消息的前提下，接收所述目标基站基于所述用户设备上下文修改请求消息返回的用户设备上下文修改响应消息修改。
- 一种电路域回落的方法，所述方法包括：MME向目标基站发送用户设备上下文修改请求消息；目标基站在接收到结束标识之前，接收到MME发送的所述用户设备上下文修改请求消息时，存储所述用户设备上下文修改请求消息或基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；所述目标基站在接收到所述结束标识后，向所述MME发送基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；所述MME在不计时重发用户设备上下文修改请求消息的前提下，接收所述目标基站基于所述用户设备上下文修改请求消息返回的用户设备上下文修改响应消息修改用户设备；其中，所述目标基站为进行X2接口切换的目标基站。
- 一种通信节点，所述通信节点为进行X2接口切换的目标基站；所述目标基站包括：存储单元，配置为当目标基站在接收到结束标识之前，接收到MME发送的用户设备上下文修改请求消息时，存储所述用户设备上下文修改请求消息或基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；第一发送单元，配置为在接收到所述结束标识后，向所述MME发送基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；其中，所述目标基站为进行X2接口切换的目标基站。
- 根据权利要求7所述的通信节点，其中，所述存储单元，配置为存储所述用户设备上下文修改请求消息；所述第一发送单元包括：第一形成模块，配置为在接收到所述结束标识后，依据存储的所述用户设备上下文修改请求消息形成所述用户设备上下文修改响应消息；发送模块，配置为向所述MME发送所述用户设备上下文修改响应消息。
- 根据权利要求7所述的通信节点，其中，所述存储单元包括：第二形成模块，配置为于在接收所述用户设备上下文请求修改消息后，依据所述用户设备上下文请求修改消息形成所述用户设备上下文修改响应消息；存储模块，配置为存储所述用户设备上下响应消息。
- 根据权利要求7、8或9所述的通信节点，其中，所述存储单元，配置为将所述用户设备上下文修改请求消息或存储用户设备上下文修改响应消息存储在S1信令存储器中。
- 一种通信节点，所述通信节点为MME；所述MME包括：第二发送单元，配置为向目标基站发送用户设备上下文修改请求消息；第二接收单元，配置为在不计时重发用户设备上下文修改请求消息的前提下，接收所述目标基站基于所述用户设备上下文修改请求消息返回的用户设备上下文修改响应消息修改用户设备。
- 一种通信系统，所述通信系统包括：MME，配置为向目标基站发送用户设备上下文修改请求消息；目标基站，配置为在接收到结束标识之前，接收到MME发送的所述用户设备上下文修改请求消息时，存储所述用户设备上下文修改请求消息或基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；所述目标基站，还配置为在接收到所述结束标识后，向所述MME发送基于所述用户设备上下文修改请求消息形成的用户设备上下文修改响应消息；所述MME，还配置为在不计时重发用户设备上下文修改请求消息的前提下，接收所述目标基站基于所述用户设备上下文修改请求消息返回的用户设备上下文修改响应消息；修改用户设备其中，所述目标基站为进行X2接口切换的目标基站。
- 一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行权利要求1至6所述方法的至少其中之一。
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| CN103209444A (zh) * | 2012-01-13 | 2013-07-17 | 华为技术有限公司 | 一种资源释放的方法和装置 |
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| CN103167575A (zh) * | 2011-12-09 | 2013-06-19 | 中兴通讯股份有限公司 | Lte系统中终端电路域业务回落接入方法和相应网元 |
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| CN111818602B (zh) * | 2020-07-13 | 2023-03-10 | 中国联合网络通信集团有限公司 | 一种csfb呼叫方法、移动管理实体、服务网关及系统 |
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