WO2012040918A1

WO2012040918A1 - Method, apparatus and system for selecting target radio access technology

Info

Publication number: WO2012040918A1
Application number: PCT/CN2010/077460
Authority: WO
Inventors: 于益俊; 陆峰
Original assignee: 华为技术有限公司
Priority date: 2010-09-29
Filing date: 2010-09-29
Publication date: 2012-04-05
Also published as: CN102687564A

Abstract

A method and related apparatus for selecting target radio access technology (RAT) are provided. Wherein, the selection method includes that an evolved Node B eNodeB receives an S1 application protocol S1-AP request message sent by a mobility management entity MME, and acquires radio access technology RAT information of a circuit switch (CS) domain; and the eNodeB determines the target RAT according to the RAT information of the CS domain. With the embodiments of the present invention, the processing delay in the whole CS fallback (CSFB) flow caused by the extra location area update flow and the roaming retry flow is decreased, and the success rate of service and user experience are raised.

Description

Target wireless access technology selection method, device and system

Technical field

The present invention relates to the field of mobile communication technologies, and in particular, to a method, an apparatus, and a system for selecting a target radio access technology.

Background technique

E-UTRAN (Evolved Universal Mobile Telecommunication System Territorial Access Network) and EPC (Evolved Packet Core Network) can form an EPS (Evolved Packet System) Evolved Packet System . However, based on the current operation of many services in the 2G or 3G circuit domain, operators need to reuse existing circuit domain services in the EPS network. Therefore, the requirements for implementing CSFB (CS Fallback) have been proposed. The so-called CSFB is connected to the circuit domain core network through the EPS network, so that the UE (User Equipment) can initiate and receive circuit domain services in the EPS network, and return to the circuit domain to complete the circuit domain service through the E-UTRAN.

In the execution of the CSFB process, the UE implements the joint attach or joint tracking area update process in the E-UTRAN to implement the MSC/VLR (Mobile Switching Center/Visitor Location Register) from the EPS network registration to the circuit domain core network. Ground location register). The MME (Mobile Management Entity) selects a PLMN (Public Land Mobile Network) of the circuit domain for the UE, allocates a corresponding LAI (Location Area Identifier), and selects a corresponding one. MSC/VLR.

In the execution of the CSFB process, the eNodeB (E-UTRAN NodeB, the evolved network base station) is required to learn the information of the network where the MSC/VLR is selected by the MME according to the selected PLMN, for example, the PLMN information of the network, and then the UE. Select the target PLMN and select the target cell. For example, if both the UE and the network side support PS HO (PS Handover), the eNodeB learns the information of the network where the MSC/VLR selected by the MME is the UE according to the PLMN selected by the MME. Further, the target PLMN is selected for the UE, and the target cell is selected.

There is currently a network architecture for hybrid networking of 2G networks and/or 3G networks, for example, Global System for Mobile Communications (GSM) GSM EDGE Radio Access Network (GSM EDGE Radio Access Network, called GERAN) and Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (Universal Mobile Telecommunication) System Territorial Radio Access Network, UTRAN) Mixed networking. In a specific scenario, the two networks of the hybrid network may use the same PLMN identifier, and the MSC/VLR is deployed in the two networks of the network. At this time, since the two networks of the networking adopt the same PLMN identity, the eNodeB cannot know the specific type of the network where the MSC/VLR selected by the MME is located according to the PLMN identity, for example, the RAT of the network (Radio Access Technology, wireless) Access technology) information, which may cause the target RAT selected by the eNodeB for the UE to be different from the RAT of the network where the MSC/VLR is actually located, so that the UE performs the CSFB

After the target cell of the 2G or 3G network, the target cell is found to be served by another MSC/VLR, and then the LAU (Location Area Update) process must be registered to the new MSC before performing the circuit i or the service. /VLR. Especially in the case of a UE being called or terminating, the new MSC/VRL re-registered by the UE needs to perform a roaming retry process with the previously registered MSC/VLR to complete the called procedure. The above additional location area update process and roaming retry process will correspondingly increase the processing delay of the entire CSFB process, reducing the business success rate and user experience. Summary of the invention

The embodiment of the invention provides a target wireless access technology selection method and related device to solve

When the 2G and/or 3G hybrid network PLMN identifiers are the same, the eNodeB cannot know the specific type of the network where the MSC/VLR is selected by the MME, so that the network where the MSC/VLR is located may be selected as the target network in the process of performing the circuit domain fallback. This causes problems that trigger the execution of additional location area update processes and roaming retry processes.

The embodiment of the present invention discloses a method for selecting a target radio access technology, including: the eNodeB eNodeB receives an S1 application protocol S1-AP request message sent by the mobility management entity MME, and learns the circuit domain radio access technology RAT information; The circuit domain RAT information determines a target RAT.

An embodiment of the present invention further discloses an evolved base station, including: a receiving unit, configured to receive a mobile tube The SI application protocol S1-AP request message sent by the entity MME is used to learn the circuit domain RAT information; and the selecting unit is configured to determine the target RAT according to the circuit domain RAT information.

The embodiment of the present invention further discloses a communication system, including: an eNodeB and an MME, where the MME is configured to learn circuit area radio access technology RAT information, and send an S1 application protocol S1-AP request message to the eNodeB; The eNodeB is configured to receive an S1 application protocol S1-AP request message sent by the MME, obtain a circuit domain radio access technology RAT information, and determine a target RAT according to the circuit i or RAT information. As can be seen from the foregoing embodiment, the MME learns the circuit domain RAT information, and sends the S1-AP request message to the eNodeB, so that the eNodeB learns the circuit domain RAT information according to the S1-AP request message, and determines the target RAT according to the circuit domain RAT information, so that The UE can be migrated to the target RAT in the CSFB process to avoid triggering the execution of additional LAU processes and roaming retry processes, reducing the processing delay of the CSFB process and improving the service success rate. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description For some embodiments of the present invention, other drawings may be obtained from those skilled in the art without departing from the drawings.

1 is a flowchart of an embodiment of a method for selecting a target radio access technology according to the present invention; FIG. 2 is a signaling flow diagram of another embodiment of a method for selecting a target radio access technology according to the present invention;

3 is a signaling flow diagram of another embodiment of a method for selecting a target radio access technology according to the present invention;

4 is a signaling flow diagram of another embodiment of a method for selecting a target radio access technology according to the present invention;

FIG. 5 is a signaling flow diagram of another embodiment of a method for selecting a target radio access technology according to the present invention; FIG.

6 is a structural diagram of an embodiment of an evolved base station according to the present invention; 7 is a structural diagram of another embodiment of an evolved base station according to the present invention;

Figure 8 is a block diagram of an embodiment of a communication system of the present invention. detailed description

The above described objects, features, and advantages of the present invention will become more apparent from the aspects of the invention. Embodiment 1

Referring to FIG. 1, which is a flowchart of an embodiment of a method for selecting a target radio access technology according to the present invention, including the following steps:

Step 101: The eNodeB receives the S1 application protocol S1-AP request message sent by the mobility management entity MME, and learns the circuit domain radio access technology RAT information.

The circuit area RAT information is specifically the RAT information of the network where the MSC/VLR selected by the MME is located.

The step of the eNodeB may include: receiving, by the eNodeB, an S1-AP request message sent by the MME, where the S1-AP request message includes a circuit domain RAT type; and the eNodeB learns the circuit domain RAT information according to the circuit domain RAT type; or, the eNodeB Receiving an S1-AP request message sent by the MME, where the S1-AP request message includes a location area identifier LAI; the eNodeB learns the circuit domain RAT information according to the LAI; or the eNodeB receives the S1-AP request message sent by the MME, The S1-AP request message includes a radio access technology/frequency priority (RFSP); the eNodeB learns the circuit domain RAT information according to the RFSP.

For example, the circuit domain RAT type is included in an independent parameter ( RAT for CS Domain ) in the S1-AP request message. After the eNodeB receives the S1-AP request message, the eNodeB learns the circuit domain according to the RAT type in the independent parameter. RAT information.

For another example, the LAI is included in the S1-AP request message, and the circuit domain RAT information is indicated by the LAI. A specific manner is to configure a mapping relationship between the LAI and the RAT information in the eNodeB, and the eNodeB learns the RAT information corresponding to the LAI in the S1-AP request message according to the mapping relationship between the LAI and the RAT information, and further learns the circuit domain RAT information. . Another specific way is: use one or more bits (Bit) in the field included in the LAI to identify the RAT information, eNodeB root The circuit domain RAT information is learned based on the bit.

For another example, the RFSP is included in the S1-AP request message, and the circuit domain RAT information is indicated by the RFSP. A specific manner is that the RFSP cell includes RAT information, and the eNodeB learns the circuit domain RAT information according to the cell. In another specific manner, the mapping relationship between the RFSP and the RAT information is locally configured in the eNodeB, and the eNodeB learns the RAT information corresponding to the RFSP in the S1-AP request message according to the mapping relationship between the RFSP and the RAT information, and further learns the circuit domain RAT information. .

In addition, the MME can learn the circuit domain RAT information in different manners and send an S1-AP request message to the eNodeB. Specifically, the MME can locally configure the mapping relationship between the RAT information of the network where the mobile switching center/the visited location register MSC/VLR is located and the MSC/VLR, and the MME according to the RAT information of the network where the MSC/VLR is located and the MSC/ The mapping relationship between the VLRs is related to the RAT information corresponding to the MSC/VLR, so that when the RAT information of the circuit domain is learned, the eNodeB receives the S1-AP request message sent by the MME, and obtains the RAT information of the circuit domain; or, when the MME receives the MSC/ The location update accept message sent by the VLR, where the location update accept message includes circuit domain RAT information, so that when the circuit domain RAT information is learned, the eNodeB receives the S1-AP request message sent by the MME, and learns the circuit domain RAT information.

For example, when the MME is configured with the mapping relationship between the RAT information of the MSC/VLR and the MSC/VLR, the MME learns the RAT information corresponding to the MSC/VLR according to the locally configured mapping relationship, so as to obtain the RAT information of the circuit domain. The S1-AP request message is sent to the eNodeB.

For example, when the MME receives the location update accept message sent by the MSC/VLR, and the location update accept message includes the circuit domain RAT information, the MME then learns the circuit domain RAT information and sends an S1-AP request message to the eNodeB.

The foregoing S1-AP request message specifically includes: an initial context setup request message, a context modification request message, or a downlink non-access stratum transmission message.

Step 102: The eNodeB determines the target RAT according to the circuit domain RAT information.

Specifically, the step may include: determining, by the eNodeB, the target RAT of the packet switching handover according to the circuit domain RAT information; or

The eNodeB determines a target RAT of the cell change command according to the circuit domain RAT information; or, the eNodeB determines, according to the circuit domain RAT information, a radio resource control connection release and a redirected target RAT. For example, the eNodeB determines the target RAT based on the learned circuit domain RAT information. In a specific manner, the eNodeB selects a RAT corresponding to the circuit domain RAT information as a target RAT, so that the UE performs CSFB migration to the RAT corresponding to the circuit domain RAT information, to avoid triggering an additional LAU process. And roaming retry process. The step may specifically include: determining, by the eNodeB, the target RAT of the packet switched handover according to the circuit domain RAT information; or determining, by the eNodeB, the target RAT of the cell change command according to the circuit domain RAT information. Or the eNodeB determines, according to the circuit domain RAT information, a radio resource control connection release and a redirected target RAT.

After determining the target RAT, the eNodeB needs to notify the UE of the determined target RAT. At this time, the determining the target RAT according to the circuit domain RAT information, and further comprising: the eNodeB ΐ UE transmitting an RRC (Radio Resource Control) message, where the RRC message includes the target RAT. Specifically, the eNodeB sends a handover command message to the UE, where the handover command message includes the target RAT; or the eNodeB sends a cell change command message to the UE, where the cell change command message includes the target RAT; or The eNodeB sends an RRC connection release message to the UE, where the RRC connection release message includes the target RAT.

For example, if both the UE and the network side support the PS HO (PS Handover, Handover Domain Switching) procedure, the Baye's J eNodeB performs a PS HO procedure to migrate the UE to the target RAT. The eNodeB sends a handover command (Handover Command) message to the UE, where the handover command message includes a target RAT. For example, the Mobility From EUTRA Command message is included in the eNodeB sending handover command message to the UE, and the Mobility From EUTR A Command message is used to indicate that it is used for handover, and indicates the type of the target RAT.

For another example, if both the UE and the network side support the CCO (Cell Change Order) process, the eNodeB performs a CCO process to migrate the UE to the target RAT. The eNodeB sends a Cell Change Order message to the UE, where the cell change command message includes a target RAT. For example, the eNodeB sends a Mobility From EUTRA Command message to the UE, the Mobility From EUTRA Command message indicating that it is used for cell change, and indicating the type of the target RAT.

For another example, if both the UE and the network side support the RRC connection release with redirection procedure, the Bay ¹ J eNodeB performs the RRC connection release procedure. Migrate the UE to the target RAT. The eNodeB sends an RRC Connection Release (RRC Connection Release) message to the UE, where the RRC connection release message indicates the type of the target RAT.

It should be noted that, according to the network side and the specific capabilities of the UE, the CSFB processing may be performed by using any one of the foregoing three methods, which is not limited by the embodiment of the present invention.

As can be seen from the foregoing embodiment, the MME learns the circuit domain RAT information, and sends the S1-AP request message to the eNodeB, so that the eNodeB learns the circuit domain RAT information according to the S1-AP request message, and determines the target RAT according to the circuit domain RAT information, so that In the CSFB process, the UE can be migrated to the network where the MSC/VLR corresponding to the target RAT is located, to avoid triggering the execution of the additional LAU process and the roaming retry process, reducing the processing delay of the CSFB process and improving the service success rate. Embodiment 2

Please refer to FIG. 2, which is a signaling flowchart of an embodiment of a method for selecting a target radio access technology according to the present invention. This embodiment is applicable to a scenario in which a UE initiates a CSFB call (ie, a CSFB caller) in an EPS network. The method specifically includes the following steps:

Step 201: The UE sends an extended service request ( Extended Service Request) message to the MME, where the service request message includes a CSFB indication.

Step 202: The MME sends an S1-AP request message to the eNodeB, and the circuit domain RAT information is indicated in the S1-AP request message.

The S1-AP request message is an INITIAL CONTEXT SETUP REQUESE message when the UE is in an idle state, and the S1-AP request message is a UE context 4 tamper request (UE) when the UE is in a connected state. CONTEXT MODIFICATION REQUEST ) message.

In addition, the method for how the MME learns the RAT information of the circuit domain has been described in detail in the first embodiment, and therefore will not be described herein.

Step 203: The eNodeB learns the circuit domain RAT information according to the S1-AP request message.

The method for the eNodeB to learn the RAT information of the circuit domain according to the S-AP request message has been described in detail in the first embodiment, and therefore will not be further described herein.

Step 204: The eNodeB sends an S1-AP response message to the MME.

Step 205: The eNodeB determines the target RAT according to the circuit domain RAT information. Preferably, before the eNodeB determines the target RAT according to the circuit domain RAT information, the eNodeB requests the measurement report from the UE for the eNodeB to determine the target RAT according to the result of the measurement report and the circuit domain RAT information.

The eNodeB determines the target RAT according to the circuit domain RAT information. The specific manner may be: the eNodeB selects the RAT corresponding to the circuit domain RAT information as the target RAT in the CSFB process. The step may specifically include: determining, by the eNodeB, the target RAT of the packet switched handover according to the circuit domain RAT information; or determining, by the eNodeB, the target RAT of the cell change command according to the circuit domain RAT information. Or the eNodeB determines, according to the circuit domain RAT information, a radio resource control connection release and a redirected target RAT.

It should be noted that the embodiment of the present application does not limit the execution sequence between step 204 and step 205.

Step 206: Execute the CSFB process.

The eNodeB may perform the PS HO process in step 206a to migrate the UE to the target RAT, thereby completing the CSFB process. Alternatively, the eNodeB may perform the CCO process in step 206b to migrate the UE to the target RAT to complete the CSFB process. Alternatively, the eNodeB may perform the RRC connection release procedure in step 206c to migrate the UE to the target RAT.

Wherein, if both the UE and the network side support the PS HO process, the PS HO process of step 206a mainly includes:

Step 206a- 1: Perform a PS HO preparation process;

Step 206a-2: The eNodeB sends a handover command message to the UE, where the handover command message includes a target RAT.

For example, the Mobility From EUTRA Command message is included in the eNodeB sending handover command message to the UE, and the Mobility From EUTRA Command message is used to indicate that it is used for handover, and indicates the type of the target RAT.

If the UE and the network side support the CCO process, the CCO process of step 206b mainly includes: Step 206b-1: The eNodeB sends a cell change command message to the UE, where the cell change command message includes the target RAT;

For example, the eNodeB sends a Mobility From EUTRA Command message to the UE, the Mobility From EUTRA Command message indicating that it is used for cell change, and indicating the target RAT type.

Step 206b-2: The eNodeB sends a UE Context Release Request message to the MME.

If the UE and the network side do not support the PS HO process or the CCO process, or the network side does not want to use the PS HO process and the CCO process, or both the UE and the network side support the RRC connection release procedure, the RRC of step 206c The connection release process mainly includes:

Step 206c-1: The eNodeB sends an RRC connection release message to the UE, where the RRC connection release message includes a target RAT;

For example, the type of the target RAT is indicated in the RRC Connection Release message.

Step 206c-2: The eNodeB sends a UE context release request to the MME (UE Context)

Release Request) message.

As can be seen from the foregoing embodiment, the MME learns the circuit domain RAT information, and sends the S1-AP request message to the eNodeB, so that the eNodeB learns the circuit domain RAT information according to the S1-AP request message, and determines the target RAT according to the circuit domain RAT information, so that In the CSFB process, the UE can be migrated to the network where the MSC/VLR corresponding to the target RAT is located, to avoid triggering additional execution of the LAU process and the roaming retry process, reducing the processing delay of the CSFB process and improving the service success rate. Embodiment 3

Referring to FIG. 3, which is a signaling flowchart of another embodiment of a method for selecting a target radio access technology according to the present invention. This embodiment is applicable to a UE receiving a CSFB call in an EPS network (ie, CSFB called or CSFB final). The scene of the call). The method can include the following steps:

Step 301: The MSC/VLR receives the voice call signaling, and sends a paging message to the MME. Step 302: The MME sends a paging message to the UE.

Specifically, when the UE is in an idle state, the MME sends a paging message to the eNodeB, and the eNodeB sends a paging message to the UE. When the UE is in the connected state, the MME sends a circuit domain service notification message to the UE.

Step 303: The UE sends an extended service request message to the MME, where the service request message includes a CSFB indication.

Step 304: The MME sends an S 1 -AP request message to the eNodeB, where the S 1 -AP request message is sent. Indicates circuit domain RAT information;

The S1-AP request message is an initial context setup request message when the UE is in an idle state, and the S1-AP request message is a UE context modification request message when the UE is in a connected state.

Step 305: The eNodeB learns the circuit domain RAT information according to the S1-AP request message.

Step 306: The eNodeB sends an S1-AP response message to the MME.

Step 307: The eNodeB determines the target RAT according to the circuit domain RAT information.

Preferably, before the eNodeB determines the target RAT according to the circuit domain RAT information, the eNodeB requests the measurement report from the UE for the eNodeB to determine the target RAT according to the result of the measurement report and the circuit domain RAT information.

The eNodeB determines the target RAT according to the circuit domain RAT information. The specific manner may be: the eNodeB selects the RAT corresponding to the circuit domain RAT information as the target RAT that falls back during the CSFB process. The step may specifically include: determining, by the eNodeB, the target RAT of the packet switched handover according to the circuit domain RAT information; or determining, by the eNodeB, the target RAT of the cell change command according to the circuit domain RAT information. Or the eNodeB determines, according to the circuit domain RAT information, a radio resource control connection release and a redirected target RAT.

It should be noted that the embodiment of the present application does not limit the execution sequence between step 306 and step 307.

Step 308: Execute the CSFB process.

The eNodeB may perform the PS HO process in step 308a to migrate the UE to the target RAT, thereby completing the CSFB process. Alternatively, the eNodeB may perform the CCO process in step 308b to migrate the UE to the target RAT, thereby completing the CSFB process. Alternatively, the eNodeB may perform the RRC connection release procedure in step 308c to migrate the UE to the target RAT. The specific implementation process has been described in detail in the second embodiment. For related processes, refer to step 206 in the second embodiment, and therefore no further details are provided herein. As shown in the foregoing embodiment, the MME learns the circuit domain RAT information, and sends the S1-AP request message to the eNodeB, so that the eNodeB learns the circuit domain RAT information according to the S1-AP request message, and determines the target RAT according to the circuit domain RAT information, so that the UE In the CSFB process, the MSC/VLR corresponding to the target can be migrated to avoid triggering additional LAU processes and roaming retry processes, reducing the processing delay of the CSFB process and improving the service success rate. Embodiment 4

Referring to FIG. 4, it is a signaling flowchart of another embodiment of a method for selecting a target radio access technology according to the present invention. Different from the first embodiment and the second embodiment, the first embodiment and the second embodiment are applicable. The scenario in which the MME provides the circuit domain RAT information to the eNodeB in the call process (corresponding to the calling and called flows respectively), this embodiment is applicable to the MME after selecting the MSC/VLR in the joint attach/federated tracking area update process. The circuit domain RAT information in which the selected MSC/VLR is located is first provided to the eNodeB, so that the eNodeB selects the scenario of the target RAT during the subsequent call. The method can include the following steps:

Step 401: The UE sends an Attach Request message/TAU Request message to the MME.

The attachment type of the foregoing attachment request message indicates that it is a Combined EPS/IMSI attach Request, or the update type of the tracking area update request message indicates that it is a Joint 3 Trace Area/Location Area Update Request ( Combined Tracking Area/Location Area Update Request) or joint tracking area/location area update, and Combined Tracking Area/Location Area Update with IMSI attach Request.

Step 402: Perform an EPS network attach/track area update process.

For example, a default bearer or the like is established in the attach process.

Step 403: The MME performs a location update process to the MSC/VLR, and the MSC/VLR performs a corresponding circuit domain location update process.

The MME selects an appropriate MSC/VLR according to the information such as the operator policy, and the PLMN where the MSC/VLR selected by the MME is located may be different from the PLMN where the MME is located. The MME may learn the circuit domain RAT information, where the RAT information is the information of the RAT in which the MME selects the MSC/VLR network in the 403 for the UE. In addition, the method of how to obtain the RAT information of the circuit domain has been described in detail in the first embodiment, and therefore will not be described herein.

Step 404: The MME sends an S1-AP request message to the eNodeB, where the S1-AP request message includes circuit domain RAT information.

The S1-AP request message is an initial context setup request message when the UE is in an idle state, and the S1-AP request message is a downlink DOWNLINK NAS TRANSPORT message when the UE is in a connected state.

In addition, an Attach Accept message/TAU Accept message sent by the MME to the UE may be encapsulated in the S1-AP request message.

Step 405: The eNodeB sends an RRC request message to the UE.

For example, the RRC request message is an RRC Connection Reconfiguration (RRC) message.

The RRC request message may further include an attach accept message/TAU accept message sent by the MME to the UE.

Step 406: The UE sends an RRC Confirmation Complete message to the eNodeB.

Step 407: The eNodeB learns the circuit domain RAT information according to the S1-AP request message.

Step 408: The eNodeB sends an S1-AP response message to the MME to complete the joint attach/joint tracking area update process.

Step 409: After performing the attach process or the tracking area update process, the call process is performed. The calling process includes a calling process and a called process, and specifically includes the following steps: Step 409a: The eNodeB determines the target RAT according to the circuit domain RAT information;

For example, the eNodeB selects the RAT corresponding to the circuit domain RAT information as the target RAT. The step may specifically include: determining, by the eNodeB, the target RAT of the packet switched handover according to the circuit domain RAT information; or determining, by the eNodeB, the target RAT of the cell change command according to the circuit domain RAT information. Or the eNodeB determines, according to the circuit domain RAT information, a radio resource control connection release and a redirected target RAT.

Step 409b: The eNodeB sends an RRC message to the UE, where the RRC message includes the target RAT. If the UE and the network side support the PS HO process, the eNodeB sends a handover command message to the UE, where the handover command message includes the target RAT. If both the UE and the network side support the CCO process, the eNodeB sends a cell change message to the UE. The cell change message includes the target RAT; if the UE and the network side do not support the PS HO process or the CCO process, or the network side does not want to use the PS HO process and the CCO process, or the UE and the network side support The RRC connection release procedure, the MME connection message is sent to the UE, and the RRC connection release message includes the target RAT.

As can be seen from the foregoing embodiment, the MME learns the circuit domain RAT information, and sends the S1-AP request message to the eNodeB, so that the eNodeB learns the circuit domain RAT information according to the S1-AP request message, and determines the target RAT according to the circuit domain RAT information, so that In the CSFB process, the UE can be migrated to the network where the MSC/VLR corresponding to the target RAT is located, avoiding triggering additional LAU processes and roaming retry processes, reducing the processing delay of the CSFB process, and improving the service success rate. Embodiment 5

Referring to FIG. 5, which is a signaling flowchart of another embodiment of a method for selecting a target radio access technology according to the present application, which is different from the first embodiment and the second embodiment, where the first embodiment and the second embodiment are applicable. In the scenario where the MME provides the circuit domain RAT information to the eNodeB in the call process (corresponding to the calling and called flows respectively), the embodiment is applicable to the MME providing the circuit domain RAT information to the eNodeB in the service request process before the call. In order for the eNodeB to select a scenario of the target cell in a subsequent call process. The method can include the following steps:

Step 501: The UE sends a Service Request message to the MME.

Step 502: The MME sends an S1-AP request message to the eNodeB, and the circuit domain RAT information is indicated in the S1-AP request message.

For example, the S1-AP request message is an initial context setup request message.

The MME may learn circuit domain RAT information, which is information that the MME selects, for the UE, the RAT of the network where the MSC/VLR is located.

Step 503: The eNodeB learns the circuit domain RAT information according to the S1-AP request message. The method for the eNodeB to learn the RAT information of the circuit domain according to the S-AP request message has been described in detail in the first embodiment, and therefore is not described here.

Step 504: The eNodeB sends an S1-AP response message to the MME to complete the joint attach/joint tracking area update process.

For example, the S 1 -AP response message is the initial context setup completion ( INITIAL CONTEXT

SETUP COMPLETE ) message.

Step 505: After performing the attach process or the tracking area update process, the call process is performed. The calling process includes a calling process and a called process, and specifically includes the following steps: Step 505a: The eNodeB determines the target RAT according to the circuit domain RAT information;

Step 505b: The eNodeB sends an RRC message to the UE, where the RRC message includes the target RAT. If the UE and the network side support the PS HO process, the eNodeB sends a handover command message to the UE, where the handover command message includes the target RAT. If both the UE and the network side support the CCO process, the eNodeB sends a cell change message to the UE. The cell change message includes the target RAT; if the UE and the network side do not support the PS HO process or the CCO process, or the network side does not want to use the PS HO process and the CCO process, or the UE and the network side support The RRC connection release procedure, the MME connection message is sent to the UE, and the RRC connection release message includes the target RAT.

As can be seen from the foregoing embodiment, the MME learns the circuit domain RAT information, and sends the S1-AP request message to the eNodeB, so that the eNodeB learns the circuit domain RAT information according to the S1-AP request message, and determines the target RAT according to the circuit domain RAT information, so that In the CSFB process, the UE can be migrated to the network where the MSC/VLR corresponding to the target RAT is located, avoiding triggering additional LAU processes and roaming retry processes, reducing the processing delay of the CSFB process, and improving the service success rate. Embodiment 6 Corresponding to a target radio access technology selection method in the first embodiment, the embodiment of the present invention further provides an apparatus related to target radio access technology selection. Please refer to FIG. 6, which is a structural diagram of an embodiment of an evolved base station according to the present invention. The apparatus includes a receiving unit 601 and a selecting unit 602. The internal structure and connection relationship will be further described below in conjunction with the working principle of the device.

The receiving unit 601 is configured to receive an S1-AP request message sent by the mobility management entity MME, to obtain circuit domain RAT information;

The selecting unit 602 is configured to determine a target RAT according to the circuit domain RAT information.

Preferably, the receiving unit 601 further includes: a first receiving subunit 6011 and a first learned subunit 6012,

The first receiving subunit 6011 is configured to receive an S1-AP request message sent by the MME, where the S1-AP request message includes a circuit domain RAT type;

The first learned sub-unit 6012 is configured to learn the circuit domain RAT information according to the circuit domain RAT type.

Alternatively, the first receiving subunit 6011 is replaced by the second receiving subunit, and the first learned subunit 6012 is replaced by the second learned subunit, that is, the receiving unit 601 further includes: a second receiving subunit and a second sub Unit,

a second receiving subunit, configured to receive an S1-AP request message sent by the MME, where the S1-AP request message includes a location area identifier LAI;

a second learned subunit, configured to learn circuit domain RAT information according to the LAI;

Alternatively, the first receiving subunit 6011 is replaced by a third receiving subunit, and the first learned subunit 6012 is replaced by a third learned subunit, that is, the receiving unit 601 further includes: a third receiving subunit and a third subunit Unit,

a third receiving subunit, configured to receive an S1-AP request message sent by the MME, where the S1-AP request message includes an RFSP;

And a third learned subunit, configured to learn the circuit domain RAT information according to the RFSP.

Further, the second learned subunit includes:

a mapping relationship obtaining sub-unit, configured to: when the mapping relationship between the LAI and the RAT information is locally configured in the eNodeB, obtain the RAT information corresponding to the LAI according to the mapping relationship between the LAI and the RAT information, thereby obtaining the circuit domain RAT information; or,

The bearer learning subunit is configured to learn the circuit domain RAT information according to the RAT information included in the LAI when the RAT information is included in the LAI.

Please refer to FIG. 7, which is a structural diagram of another embodiment of an evolved base station according to the present invention. As shown in FIG. 7, the evolved base station includes a receiving unit 601 and a selecting unit 602, and a transmitting unit 603, configured to send a radio resource control RRC message to the UE, where the RRC message includes the target RAT.

Preferably, the sending unit 603 includes:

a first sending subunit, configured to send a handover command message to the UE, where the handover command message includes the target RAT;

Or,

a second sending subunit, configured to send a cell change command message to the UE, where the cell change command message includes the target RAT;

Or,

And a third sending subunit, configured to send an RRC connection release message to the UE, where the RRC connection release message includes the target RAT.

It should be noted that the foregoing S1-AP request message specifically includes: an initial context setup request message, a context modification request message, or a downlink non-access stratum transmission message.

As can be seen from the foregoing embodiment, the MME learns the circuit domain RAT information, and sends the S1-AP request message to the eNodeB, so that the eNodeB learns the circuit domain RAT information according to the S1-AP request message, and determines the target RAT according to the circuit domain RAT information, so that The UE can be migrated to the target RAT in the CSFB process, avoiding triggering additional LAU processes and roaming retry processes, reducing the processing delay of the CSFB process and improving the service success rate. Example 7

Corresponding to a target radio access technology selection method in the first embodiment, the embodiment of the present invention further provides a communication system. Please refer to FIG. 8, which is a structural diagram of an embodiment of a communication system including an MME 801 and an eNodeB unit 802. The internal structure and connection relationship will be further described below in conjunction with the working principle of the device. The MME 801 is configured to learn the circuit domain radio access technology RAT information, and send an S1 application protocol S1-AP request message to the eNodeB 802.

The eNodeB 802 is configured to receive an S1 application protocol S1-AP request message sent by the MME 801, obtain a circuit domain radio access technology RAT information, and determine a target RAT according to the circuit domain RAT information.

Preferably, the MME 801 further includes:

a first learned sub-unit, configured to: when the MME locally configures a mapping relationship between the RAT information of the network where the mobile switching center/visit location register MSC/VLR is located and the MSC/VLR, according to the RAT of the network where the MSC/VLR is located The mapping relationship between the information and the MSC/VLR learns the RAT information corresponding to the MSC/VLR, thereby obtaining the circuit domain RAT information;

Or,

The second learned sub-unit is configured to receive a location update accept message sent by the MSC/VLR, where the location update accept message includes circuit domain RAT information, thereby obtaining circuit domain RAT information.

It can be seen that the MME learns the circuit domain RAT information, and sends the S1-AP request message to the eNodeB, so that the eNodeB learns the circuit domain RAT information according to the S1-AP request message, and determines the target RAT according to the circuit domain RAT information, so that the UE In the CSFB process, the target RAT can be migrated to avoid triggering additional LAU processes and roaming retry processes, reducing the processing delay of the CSFB process and improving the service success rate.

It should be noted that those skilled in the art can understand that all or part of the processes in the foregoing embodiments can be implemented by a computer program to instruct related hardware, and the program can be stored in a computer readable storage. In the medium, the program, when executed, may include the flow of an embodiment of the methods as described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

The foregoing description of the preferred method for selecting a wireless access technology and related apparatus provided by the present invention is only for assisting in understanding the method of the present invention and its core idea. Meanwhile, for those skilled in the art, according to the present invention, The present invention is not limited by the scope of the present invention.

Claims

Rights request

A method for selecting a target wireless access technology, characterized in that:

The evolved base station eNodeB receives the S1 application protocol S1-AP request message sent by the mobility management entity MME, and learns the circuit domain radio access technology RAT information;

The eNodeB determines the target RAT based on the circuit domain RAT information.

The method according to claim 1, wherein the eNodeB receives the S1-AP request message sent by the MME, and obtains the circuit area RAT information, which specifically includes:

The eNodeB receives the S1-AP request message sent by the MME, where the S1-AP request message includes a circuit domain RAT type;

The eNodeB learns the circuit domain RAT information according to the circuit domain RAT type;

Or,

The eNodeB receives the S1-AP request message sent by the MME, where the S1-AP request message includes a location area identifier LAI;

The eNodeB learns the circuit domain RAT information according to the LAI;

Or,

The eNodeB receives the S1-AP request message sent by the MME, where the S1-AP request message includes a radio access technology/frequency priority RFSP; and the eNodeB learns the circuit domain RAT information according to the RFSP.

The method according to claim 2, wherein the eNodeB obtains the circuit domain RAT information according to the LAI, and specifically includes:

When the mapping between the LAI and the RAT information is configured locally in the eNodeB, the eNodeB learns the RAT information corresponding to the LAI according to the mapping relationship between the LAI and the RAT information, thereby obtaining the circuit domain RAT information;

Or,

When the RAT information is included in the LAI, the eNodeB learns the circuit domain RAT information according to the RAT information included in the LAI.

The method according to claim 2, wherein the eNodeB knows the circuit domain RAT information according to the RFSP, and specifically includes:

RAT information is included in the RFSP, and the eNodeB is based on the RAT information included in the RFSP. Knowing the circuit domain RAT information;

Or,

When the mapping between the RFSP and the RAT information is configured locally in the eNodeB, the eNodeB learns the RAT information corresponding to the RFSP according to the mapping relationship between the RFSP and the RAT information, thereby obtaining the circuit domain RAT information.

When the MME locally configures the mapping relationship between the RAT information of the network where the mobile switching center/visit location register MSC/VLR is located and the MSC/VLR, the MME is configured according to the RAT information of the network where the MSC/VLR is located and the MSC/VLR. The mapping relationship learns the RAT information corresponding to the MSC/VLR, so that when the circuit domain RAT information is learned, the eNodeB receives the S1-AP request message sent by the MME, and learns the circuit domain RAT information;

Or,

When the MME receives the location update accept message sent by the MSC/VLR, and the location update accept message includes the circuit domain RAT information, so that the circuit domain RAT information is obtained, the eNodeB receives the S1-AP request message sent by the MME, and learns the circuit domain RAT information. .

The method according to claim 1, wherein the eNodeB determines the target RAT according to the circuit domain RAT information, and specifically includes:

Determining, by the eNodeB, a target RAT of the packet switched handover according to the circuit domain RAT information; or, the eNodeB determines a target RAT of the cell change command according to the circuit domain RAT information; or, the eNodeB determines the radio resource according to the circuit domain RAT information. Controls the connection release and the target RAT of the redirect.

The method according to claim 1, wherein the eNodeB, after determining the target RAT according to the circuit domain RAT information, further includes:

The eNodeB sends a radio resource control RRC message to the UE, where the RRC message includes the

3 standard RAT.

The method according to claim 6, wherein the eNodeB sends an RRC message to the UE, where the RRC message includes the target RAT specifically includes:

The eNodeB sends a handover command message to the UE, where the handover command message includes the target RAT;

Or,

The eNodeB sends a cell change command message to the UE, where the cell change command message includes the target RAT;

Or,

The eNodeB sends an RRC connection release message to the UE, where the RRC connection release message includes the target RAT.

The method according to any one of claims 1-8, wherein the S1-AP request message specifically includes:

An initial context setup request message, a context modification request message, or a downlink non-access stratum transmission message.

10. An evolved base station, comprising:

a receiving unit, configured to receive an S1 application protocol S1-AP request message sent by the mobility management entity MME, and obtain the circuit domain RAT information;

And a selecting unit, configured to determine a target RAT according to the circuit domain RAT information.

The eNB according to claim 10, wherein the receiving unit comprises: a first receiving subunit, configured to receive an S1-AP request message sent by the MME, where the S1-AP request message includes a circuit Domain RAT type;

a first learned subunit, configured to learn circuit domain RAT information according to the circuit domain RAT type; or

Or,

The evolved base station according to claim 11, wherein the second learned subunit comprises: a mapping relationship obtaining sub-unit, configured to: when the mapping relationship between the LAI and the RAT information is locally configured in the eNodeB, obtain the RAT information corresponding to the LAI according to the mapping relationship between the LAI and the RAT information, thereby obtaining the circuit domain RAT information;

Or,

The evolved base station according to claim 10, further comprising:

And a sending unit, configured to send a radio resource control RRC message to the UE, where the RRC message includes the target RAT.

The eNB according to claim 13, wherein the sending unit includes: a first sending subunit, configured to send a handover command message to the UE, where the handover command message includes the target RAT;

Or,

The evolved base station according to any one of claims 10-14, wherein the S1-AP request message specifically includes: an initial context setup request message, a context modification request message, or a downlink non-access stratum transmission. Message.

A communication system, comprising: an evolved base station eNodeB and a mobility management entity MME, where

The MME is configured to learn the circuit domain radio access technology RAT information, and send an S1 application protocol S1-AP request message to the eNodeB;

The eNodeB is configured to receive an S1 application protocol S1-AP request message sent by the MME, obtain a circuit domain radio access technology RAT information, and determine a target RAT according to the circuit domain RAT information.

17. The mobility management entity of claim 16, wherein the MME packet Includes:

Or,