WO2012152129A1

WO2012152129A1 - Home location register resetting processing method and system

Info

Publication number: WO2012152129A1
Application number: PCT/CN2012/072697
Authority: WO
Inventors: 刘竞翔; 朱进国; 李振东
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-05-09
Filing date: 2012-03-21
Publication date: 2012-11-15
Also published as: CN102186158B; CN102186158A

Abstract

A home location register (HLR) resetting processing method and system, applied in a call receding system. The HLR resetting processing method includes: after receiving a resetting notification message from an HLR, a visitor location register (VLR) sending a notification message to a mobile management entity (MME). The technical solution of the present invention notifies the MME as to where the user equipment (UE) of the resetting is located after the HLR resets, which enables the MME to reinitiate location update in time and register the UE on the HLR. As such, the HLR obtains the corresponding VLR number, and then is able to correctly perform call routing when the subscriber is the called party.

Description

Home location register reset processing method and system

Technical field

The present invention relates to communication technologies, and in particular, to a method and system for processing a home location register reset. Background technique

System Architecture Evolution (SAE) network is a new generation of wireless network technology developed by the 3rd Generation Partnership Projective (3GPP) to replace traditional circuit-switched networks, including Long Term Evolution (Long) Term Evolution (LTE) and the evolved packet core network (EPC). The architecture is shown in Figure 1. The functions of each network element are described as follows:

User Equipment (UE), which has access to the global mobile communication system. Universal Mobile Telecommunication System Radio Access

Radio Access Network, GERAN) and LTE capabilities for both wireless networks. Among them, UTRAN stands for 3G and GERAN stands for 2G; UEs can only reside in one wireless system (called Single Radio) at the same time due to capacity limitations and energy saving requirements, such as when the UE resides in LTE At the time, the paging message cannot be received from UTRAN/GERAN at this time.

An evolved NodeB (eNodeB) can provide a ratio on an air interface.

UTRAN has higher uplink and downlink rates, lower transmission delay and more reliable wireless transmission. The eNodeB provides radio resources for terminal access and establishes an S1 control plane link with the mobility management unit (MME) of the core network.

Mobility Management Entity (MME) is a control plane entity that temporarily stores user data. It is responsible for managing and storing UE contexts (such as UE/user ID, mobility management status, and user security parameters). The user is assigned a temporary global identifier (GUTI), and the MME is responsible for authenticating the user when the user accesses from LTE. The SAE Gateway (System Architecture Evolution GW, SAE GW for short) is a user plane entity responsible for user plane data routing processing. The SAE GW is generally divided into a Serving GW and a Packet Data Network Gateway (PDN GW). The Serving GW is responsible for the mobility anchor between LTE and UMTS. In the idle state, the downlink data triggers the MME and SGSN paging. PDN GW Responsible for the UE accessing the PDN (Packet Data Network) gateway function, assigning users the Internet Protocol (IP) address. The PDN GW and the Serving GW may be combined in one physical entity.

The home subscriber server (HSS) is used to store the user's subscription data and record the MME name (MME NAME) where the user is located.

Figure 1 also shows the architecture of a traditional circuit domain switching network. The core network element has a Mobile Switching Center (MSC) and a Visitor Location Register (VLR). The MSC and the VLR are physically combined.

The 3G radio network controller (RNC) or base station controller (BSC) is responsible for controlling and managing the user's wireless activities.

The traditional circuit domain switching network uses a home location register (Home Location Register,

HLR) Saves the user's subscription information and the address of the VLR. In the called call, the HLR can obtain the Mobile Subscriber Roaming Number (MSRN) from the VLR. In Figure 1, the HLR and HSS are served by one physical network element.

The Gateway Mobile Switching Center (GMSC) is used to route calls to the MSC where the user is located. When there is a call to the mobile subscriber, the GMSC obtains the subscriber's MSRN through the HLR and then routes the call according to the MSRN.

The SG network element of the SAE and the VLR of the traditional circuit domain switching network are connected through the SGs interface. Summary of the invention

The replacement of traditional circuit domain switching networks by SAE networks is a long-term trend. In this process, since the traditional circuit domain switching network has better wireless coverage and stable service, it is an effective supplement to the SAE network. When SAE is unable to provide satisfactory traditional voice services, it can be transferred to traditional circuit domains. The exchange network provides related services. This mechanism of fallback to the traditional circuit domain switching network is called Circuit Switch Fallback (CSFB) technology. A UE that can fall back to the traditional circuit domain switching network for service is called a dual mode single radio UE. The CSFB technology establishes an SGs interface between the MME of the SAE and the VLR of the traditional circuit domain switching network. The MME can enable the UE roaming under the LTE to trigger the location update process of the traditional circuit domain switching network, so that the UE registers in the traditional circuit domain switching network while the SAE is active. The process includes the following steps:

Step 201: The UE in the LTE is powered on or changes the Tracking Area (TA), and initiates an ATTACH or a Tracking Area Update (TAU) operation.

Step 202: The MME receives the foregoing message, and performs registration in the SAE to the HSS.

Step 203: After the registration is successful, the MME derives a location area (LAI) of the UE in the traditional circuit domain switching network by using the tracking area where the UE is located, and locates the corresponding VLR. The MME sends the location through the SGs interface. Update request to the VLR;

Step 204: If the VLR does not have user data, or the VLR considers that the user data is unreliable, the VLR sends a location update request to the HLR;

Step 205: The HLR inserts the user data into the VLR, and the VLR records the user subscription data, and returns a response.

Step 206: The HLR returns a success response of the location update, and records the number of the VLR where the user is located. Step 207: The VLR returns a location update complete message to the MME, and modifies the status of the SGs interface to be activated.

After the HLR is registered, the user can receive the called call from the traditional circuit domain switching network in the form of CSFB. For the process, refer to FIG. 3, which specifically includes:

Step 301: After receiving the IAM (Initial Address Message) of the external network, the GMSC finds the called HLR according to the called MSISDN number (ie, the user's phone number), and sends an SRI (Send Routing Information) to the HLR. Information) request, with the user's MSISDN number;

Step 302: The HLR finds the MSCWLR number registered by the user according to the MSISDN number, and sends a PRN (Provide Roaming Number) request to the MSCWLR. The MSGWLR is the MSCWLR that the UE registers from the LTE/EPC; the MSCWLR allocates the temporary subscriber identity MSRN and returns it to the HLR. The MSRN uniquely identifies the MSCWLR and the called UE; Step 303, the HLR returns an SRI response to the GMSC, and the response carries the MSRN;

Step 304: The GMSC then routes the call to the MSCWLR according to the MSRN.

Step 305: The MSCWLR initiates a CS paging process from the SGs to the MME, where the MME is

LTE internally initiates a CS paging process;

Step 306: The UE rolls back to the circuit domain, and initiates a paging response from the traditional circuit domain switching network. Step 307: If necessary, the MSCWLR performs an access operation.

Step 308: The MSCWLR sends a call setup request (Setup) to the UE.

Step 309: The MSCWLR, the RNC, and the UE complete the remaining called establishment process.

The HLR in the traditional circuit domain switching network may lose the user's dynamic data, including the number of the VLR of the user, in the event of a failure. This will cause the HLR to fail to obtain the MSRN from the VLR and the subscriber will therefore not be called as a call. To solve this problem, the HLR in the traditional circuit domain switching network sends a reset message (RESET) to the VLR after the restart, and the VLR receives the user data to be unreliable. When the subsequent UE exchanges network activity or periodically performs location update in the traditional circuit domain, the VLR will initiate a location update operation to the HLR, so that the HLR regains the VLR number of the user.

The above method can effectively solve the HLR restart problem in the traditional circuit domain switching network. However, when the UE camps on the LTE, the MME initiates a flow to the VLR only when the UE is powered on or changes the tracking area. Therefore, if the UE does not move, and does not restart, the VLR The location update message will not be received and will not be registered with the HLR. As a result, the restarted HLR cannot obtain the VLR number, and the user will not be able to receive incoming calls from the traditional circuit domain switched network for a long time.

The present invention provides a method and system for processing an HLR reset, so as to solve the problem that a UE residing in LTE cannot perform a call reception circuit domain switching network incoming call after the HLR of the traditional circuit domain switching network is restarted.

The invention provides a processing method for HLR reset, which is applied to a call fallback system, the party The law includes:

The visitor location register (VLR) sends a notification message to the mobile management entity (MME) upon receiving a reset notification message from the HLR.

Preferably, the notification message carries identification information of a user equipment (UE) registered at the HLR, and the identifier information includes an International Mobile Subscriber Identity (IMSI) identifier or an IMSI number segment.

Preferably, after the VLR sends the notification message to the MME, the method further includes: the MME marking the UE according to the identifier information.

Preferably, after the MME marks the UE, the method further includes: when the UE performs a service, initiate a location update procedure, and re-register the UE to the

The HLR; wherein the service includes one or more of a booting service, a change tracking area service, a call service, and a periodic tracking area update service.

Preferably, after the UE is successfully re-registered to the HLR, the method further includes: deleting, by the MME, the marking performed on the UE.

The present invention also provides a processing system for resetting a home location register (HLR), which is applied to a call drop system, the system comprising a visitor location register (VLR) and a mobility management entity (MME), wherein:

The VLR is configured to: send a notification message to the MME after receiving a reset notification message from the HLR.

Preferably, the MME is further configured to: after the VLR sends a notification message to the MME, mark the UE according to the identifier information.

Preferably, the MME is further configured to: after marking the UE, when the UE performs a service, initiate the location update process, and re-register the UE to the HLR; where the service includes Start up business, change tracking area business, call service and periodic tracking area update industry One or several of the tasks.

Preferably, the MME is further configured to: after the UE is successfully re-registered to the HLR, delete the marking performed on the UE.

After the HLR is reset, the method and the system notify the MME where the UE is located, so that the MME can re-initiate the location update and register the UE to the HLR. In this way, the HLR obtains the corresponding VLR number, so that the call routing can be correctly performed when the user is called.

BRIEF abstract

Figure 1 shows the architecture of SAE and traditional circuit domain switching networks;

2 is a signaling flow chart of a user performing a traditional circuit domain switching network registration process in LTE; FIG. 3 is a signaling flow chart of a user returning to a traditional circuit domain switching network under LTE, and receiving a traditional circuit domain switching network incoming call processing process;

FIG. 4 is a signaling flowchart of a user re-registering to a traditional circuit domain switching network in LTE after the HLR is reset according to an embodiment of the present invention.

Preferred embodiment of the invention

In order to make the objects, the technical solutions and the advantages of the present invention more clearly, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments of the present application may be arbitrarily combined with each other.

The present invention provides a method for processing a home location register (HLR) reset, which is applied to a call drop system, the method comprising: a visit location register (VLR) to a mobility management entity after receiving a reset notification message from the HLR (MME) sends a notification message.

Before the step, the method further includes: resetting the HLR of the traditional circuit domain switching network, and sending a reset notification message to the VLR after the restarting;

In this step, the VLR retrieves the UE registered in the HLR and camps on the LTE, and sends a notification message that the HLR is reset to the corresponding MME through the SGs interface, and the notification message carries the message. Identification information of the UE, where the IMSI may be used as the identifier of the user; or may carry multiple IMSI identifiers, and may also carry the number segment of the IMSI for the MME to retrieve the user that needs to be marked as "HLR reset"; meanwhile, the VLR sets the UE Unreliable for user data.

After receiving the notification message, the MME marks the UE as "HLR reset"; when the UE performs the service under LTE, the MME sends a location update message to the VLR; after the VLR receives, the UE is unreliable because the user data is set. , so initiate a location update to the HLR.

The foregoing services include, but are not limited to, the following services: power-on service, change tracking area service, call service, and periodic tracking area update service.

After the reset of the HLR, the present invention notifies the MME of the UE to the MME, so that the MME can re-initiate the location update in time and register the UE with the HLR. In this way, the HLR obtains the corresponding VLR number, so that the call routing can be correctly performed when the user is called.

As shown in FIG. 4, the signaling flow chart of the user re-registering to the traditional circuit domain switching network after the HLR reset is implemented in the present invention, the process includes:

Step 401: The HLR restarts after resetting, and sends a reset notification to the VLR;

Step 402: The VLR searches for the UE registered in the HLR, and marks the UE as user data is unreliable. If the UE is active under LTE, that is, the SGs port status of the UE is activated, the VLR sends the MME identity according to the recorded MME identity. The notification message is sent to the MME, where the identifier of the UE is carried. If there are multiple UEs, the message may carry the identifier of multiple UEs or the number segment identified by the UE. Step 403: The MME receives the message, marking the UE as "HLR reset. Step 404: When the UE performs the service, in this embodiment, the service performs periodic TAU for the UE. Step 405: After the periodic TAU succeeds, the MME sends a location update request to the VLR. Step 406: The VLR receives the location. After the update request, since the UE is marked as unreliable for user data, a location update to the HLR is initiated;

Step 407: The HLR reinserts the user data.

Step 408: The VLR saves the user data, and returns to insert the user data successfully.

Step 409: The HLR saves the VLR number, and returns the location update accept; the UE re-registers successfully in the HLR; Steps 405 to 409 are the same as the prior art processing;

Step 410: The VLR returns a location update success response to the MME, and the MME deletes the "HLR occurrence reset flag" of the user.

After the HLR is reset, the VLR transmits the dual-mode single-frequency UE identifier corresponding to the reset HLR to the MME, so that the MME can re-register the HLR in time after the UEs are active, so that the user's service can be restored as soon as possible. Improve the quality of service of the network.

The VLR is configured to send a notification message to the MME after receiving a reset notification message from the HLR.

The notification message carries the identification information of the user equipment (UE) registered in the HLR, and the identifier information includes an International Mobile Subscriber Identity (IMSI) identifier or an IMSI number segment.

In addition, the MME is further configured to mark the UE according to the identifier information after the VLR sends a notification message to the MME.

Further, the MME is further configured to: after marking the UE, when the UE performs a service, initiate the location update process, and re-register the UE to the HLR; where the service includes One or several of the startup service, the change tracking area service, the call service, and the periodic tracking area update service.

Further, the MME is further configured to delete the label that is performed on the UE after the UE is successfully re-registered to the HLR.

After the HLR is reset, the VLR in the above system notifies the MME to the MME where the UE is located, so that the MME can re-initiate the location update in time and register the UE with the HLR. In this way, the HLR obtains the corresponding VLR number, so that the call routing can be correctly performed when the user is called.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program that instructs the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment can be used The form of hardware implementation can also be implemented in the form of software function modules. The invention is not limited to any specific form of combination of hardware and software.

The above embodiments are only intended to illustrate the technical solutions of the present invention and are not to be construed as limiting the invention. It should be understood by those skilled in the art that the present invention may be modified or equivalently substituted without departing from the spirit and scope of the invention.

Industrial applicability

After the HLR is reset, the method and the system notify the MME where the UE is located, so that the MME can re-initiate the location update in time to register the UE with the HLR. In this way, the HLR obtains the corresponding VLR number, so that the call routing can be correctly performed when the user is called.

Claims

Claim

A method for processing a home location register (HLR) reset, applied to a call fallback system, the method comprising:

2. The method according to claim 1, wherein

3. The method according to claim 2, wherein

After the VLR sends a notification message to the MME, the method further includes:

The MME marks the UE according to the identifier information.

4. The method according to claim 3, wherein

After the MME marks the UE, the method further includes:

When the UE performs the service, the location update process is initiated, and the UE is re-registered to the HLR. The service includes one of a boot service, a change tracking area service, a call service, and a periodic tracking area update service. Kind or several.

5. The method according to claim 4, wherein

After the UE is successfully re-registered to the HLR, the method further includes:

The MME deletes the marking performed on the UE.

6. A processing system for resetting a home location register (HLR), applied to a call fallback system, the system comprising a visitor location register (VLR) and a mobility management entity (MME), wherein: the VLR is set to: upon receiving A notification message is sent to the MME after a reset notification message from the HLR.

7. The system according to claim 6, wherein

The notification message carries identifier information of a user equipment (UE) registered in the HLR, and the identifier information includes an International Mobile Subscriber Identity (IMSI) identifier or an IMSI number segment.

8. The system according to claim 7, wherein

The MME is further configured to: after the VLR sends a notification message to the MME, mark the UE according to the identifier information.

9. The system according to claim 8, wherein

The MME is further configured to: after marking the UE, when the UE performs a service, initiate the location update process, and re-register the UE to the HLR; where the service includes a boot service, Change one or more of the tracking area service, the call service, and the periodic tracking area update service.

10. The system according to claim 9, wherein

The MME is further configured to: after the UE is successfully re-registered to the HLR, delete the marking performed on the UE.