WO2015117344A1

WO2015117344A1 - Plmn selection method and device for ps domain and cs domain

Info

Publication number: WO2015117344A1
Application number: PCT/CN2014/087845
Authority: WO
Inventors: 梁爽; 朱进国; 刘竞翔
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-02-10
Filing date: 2014-09-29
Publication date: 2015-08-13
Also published as: CN104837183A

Abstract

Provided are a PLMN selection method and device for a PS domain and a CS domain. The selection method comprises: acquiring, by a network element of a first core network, information about a first PLMN registered in a PS domain or information about a second PLMN registered in a CS domain; and selecting, by the network element of the first core network, the first PLMN registered in the CS domain for a user equipment according to the information about the first PLMN, or selecting the second PLMN registered in the PS domain for the user equipment according to the information about the second PLMN. By means of the technical solution provided in the present invention, the technical problem in the related art that the existing PLMN selection solution may lead to PLMNs selected by the CS domain and the PS domain being different, thus generating a difference in the phone charges or a difference in the operator names displayed on a terminal, is solved, so that it is guaranteed that the CS domain and the PS domain select the same PLMN, thereby avoiding the difference in the phone charges or the difference in the operator names displayed on the terminal, and improving the user experience.

Description

PLMN selection method and device for PS domain and CS domain

Technical field

The present invention relates to the field of communications, and in particular to a Public Land Mobile Network (PLMN) of a Packet Switched (PS) domain and a Circuit Switched (CS) domain. Method of choosing.

Background technique

Currently deployed in the 3rd Generation Partnership Project (3GPP) network, the following network devices are included, as shown in FIG. 1 .

The user equipment (User Equipment, UE for short) has the capability of accessing the Universal Mobile Telecommunication System Radio Access Network (GSM EDGE Radio Access Network, UTRAN/GERAN), and the UE can also It has the ability to access two wireless networks, Long Term Evolution (LTE). When the UE accesses the network from GERAN/UTRAN, it can access the CS domain or the PS domain. The so-called CS domain is called the Mobile Switching Center (MSC); the so-called PS domain, that is, the General Packet Radio Service (GPRS) support node (Serving GPRS Supporting Node, referred to as For SGSN). Whether the UE can access two domains at the same time is related to the capabilities of the UE and the capabilities of the network. In GERAN/UTRAN, the base station controller (BSC) or the radio network controller (RNC) is responsible for controlling and managing the wireless activity of the user. IMS is an abbreviation of IP Multimedia Subsystem.

The core network element of the CS domain includes: an MSC and a Visitor Location Register (VTR). The MSC and the VLR are physically combined together to manage the location information of the user and the call connection. The Gateway Mobile Switching Center (GMSC) is set to route calls to the MSC where the user is located. When there is a call to the mobile subscriber, the GMSC obtains the mobile subscriber roaming number (Mobile Subscriber Roaming Number, MSRN for short) through the Home Location Register (HLR), and then routes the call according to the MSRN.

The PS domain core network has a general packet SGSN, which is a control network element of the GPRS network. The main function is to record the location information of the UE, and between the UE and the GPRS Gateway Supporting Node (GGSN) or between the UE and the GPRS gateway support node (GGSN). Service Gateway (Serving Gateway, S-GW for short) / number of packets The transmission and reception of mobile packet data is completed between the Packet Data Network Gateway (P-GW).

Both the MSC/VLR and the SGSN need to be connected to the HLR or Home Subscriber Server (HSS), which stores the subscriber's subscription information and the address of the VLR. In the called call, the HLR/HSS can obtain the user's MSRN from the VLR. As shown in Figure 1, the HLR and HSS are served by one physical network element.

In the actual deployment network, operators can adopt the method of establishing a shared network in order to save investment costs. The shared network has two modes of co-construction, as shown in Figure 2 and Figure 3:

In the network shown in FIG. 2, the operators' networks are all co-constructed, including the wireless network and the core network control network elements (MSC and SGSN). In the network shown in Figure 3, the operator only uses the wireless network co-construction method, and the control network element of the core network is separately constructed.

If the user equipment accesses the above shared network, and the user equipment supports selecting one of the multiple PLMNs, the network determines the PLMN for the user equipment according to the selection of the user equipment. For some legacy terminals, that is, terminals that do not have the PLMN selection capability, the BSS/RNC can only select the default PLMN for the terminal. When the user accesses the CS domain and the PS domain at the same time, in order to avoid the difference in the call charge or the difference between the terminal and the operator name, it is desirable that the PLMN selected by the CS domain and the PS domain are consistent.

But when the user switches from other BSS/RNC to GERAN/UTRAN supporting the shared network, the PLMN of the target cell is selected by the source radio side network element. When the PS handover occurs, and the target network does not support the PS and the CS to perform the service at the same time, the registration of the CS domain needs to be performed after the PS handover is completed. That is, when the user switches to the target network to complete the PS service, the registration of the CS domain is performed. This results in the PLMN of the PS domain being selected by the source radio side network element, and the PLMN of the CS domain is selected by the target radio side network element. Therefore, the PLMN selected by the CS domain and the PS domain may be different, thereby generating a difference in call charges or a difference in the terminal display operator name.

Summary of the invention

For the related art, the existing PLMN selection scheme may cause technical problems such as different PLMNs selected by the CS domain and the PS domain, and the embodiment of the present invention provides a PLMN selection method and apparatus for the PS domain and the CS domain, to at least Solve the above problem.

In order to achieve the above object, according to an embodiment of the present invention, a public land mobile telephone network PLMN selection method for a packet switched PS domain and a circuit switched CS domain is provided, including: acquiring, by a first core network element, First PLMN information registered in the PS domain, or second PLMN information registered in the CS domain; the first core network element selects the first PLMN registered in the CS domain for the user equipment according to the first PLMN information, or according to the first PLMN information The second PLMN information is for the user equipment to select a second PLMN registered in the PS domain.

Preferably, the first core network element acquires the first PLMN information registered in the PS domain, or the second PLMN information registered in the CS domain, including: the first core network element sends a location update request to the home location register; Receiving, by the first core network element, a response message for inserting a user data message and the location update request; the first core network element acquiring the first PLMN from the response message or the inserted user data message Information or the second PLMN information.

Preferably, before the first core network element sends the location update request to the home location register, the method includes: when the first core network element is a mobile switching center MSC or a visitor location register VLR, the home location The register receives a location update request from a general packet radio service support node SGSN, where the location update request carries the first PLMN information; when the first core network element is an SGSN, the home location The register receives a location update request from the MSC or the VLR, wherein the location update request carries the second PLMN information.

Preferably, the sending, by the first core network element, a location update request to the home location register includes: sending, by the first core network element, the location update request to the home location register every time the user accesses Or, when the user accesses the first core network element from the base station subsystem BSS or the radio network controller RNC, the first core network element receives a first notification message from the BSS or the RNC; In the first notification message, indicating that the BSS or the RNC does not perform a cooperative selection PLMN for the PS domain and the CS domain, and the first core network element sends the location update request to the home location register .

Preferably, the first core network element acquires the first PLMN information registered in the PS domain, or the second PLMN information registered in the CS domain, including: the first core network element sends an authentication data request to the home location register The first core network element receives the authentication data response information fed back by the home location register, where the authentication data response information is response information of the authentication data request; the first core network The element acquires the first PLMN information or the second PLMN information from the authentication data response information.

Preferably, before the first core network element sends the authentication data request to the home location register, the method includes: when the first core network element is an MSC or a VLR, the home location register receives the SGSN from the SGSN. a location update request, where the location update request carries the first PLMN information; when the first core network element is an SGSN, the home location register receives a location update request from an MSC or a VLR, where And the location update request carries the second PLMN information.

Preferably, the sending, by the first core network element, the authentication data request to the home location register comprises: sending, by the first core network element, the authentication to the home location register every time the user accesses a data request; or, when the user accesses the first core network element from the BSS or the RNC, the first core network element receives a first notification message from the BSS or the RNC; wherein, in the A notification message indicates that the BSS or the RNC does not perform a coordinated selection of a PLMN for a PS domain and a CS domain, and the first core network element sends the authentication data request to the home location register.

Preferably, the first core network element acquires the first PLMN information registered in the PS domain, or the second PLMN information registered in the CS domain, including: detecting, in the home location register, that the user equipment is registered in the PS domain or the CS domain. When the PLMN is changed, or the stored PLMN is different from the PLMN registered by the PS domain, the first core network element receives the second notification message from the home location register, where The second notification message carries the first PLMN information or the second PLMN information.

Preferably, the first core network element selects a first PLMN registered in the CS domain for the user equipment according to the first PLMN information, or selects a registration in the PS domain for the user equipment according to the second PLMN information. The second PLMN includes:

Determining whether the first core network element supports the first PLMN or the second PLMN;

If the first PLMN or the second PLMN is supported, the first PLMN or the second PLMN is taken as a final selection result;

If the first PLMN or the second PLMN is not supported, the first core network element redirects the location update LAU procedure to the same CS domain or the PS domain to support the first PLMN or the second PLMN a second core network element; the first PLMN or the second PLMN is selected by the second core network element for the user equipment.

Preferably, the first core network element redirects the location update LAU procedure to the second core network element supporting the first PLMN or the second PLMN in the same CS domain or PS domain, including: The first core network element sends a third notification message to the BSS or the RNC accessed by the user, where the third notification message carries the first PLMN information or the second PLMN information, and the third notification message The first PLMN information or the second PLMN information carried in the second PLMN information is used to select the second core network element for the BSS or the RNC.

Preferably, the first PLMN information and the second PLMN information each comprise one of: an SGSN number, an MSC number or a VLR number, and a PLMN number for indicating the PLMN where the user equipment is located.

In order to achieve the above object, according to another embodiment of the present invention, a public land mobile telephone network PLMN selecting apparatus for a packet switched PS domain and a circuit switched CS domain is further provided, which is applied to a core network element, and includes: an acquiring module, Set to acquire the first PLMN information registered in the PS domain, or the second PLMN information registered in the CS domain; the selecting module is configured to select, according to the first PLMN information, the first PLMN registered in the CS domain for the user equipment, or The second PLMN registered in the PS domain is selected for the user equipment according to the second PLMN information.

Preferably, the acquiring module includes: a first sending unit, configured to send a location update request to the home location register; the first receiving unit is configured to receive the response message of the location update request and insert a user data message; And an obtaining unit, configured to acquire the first PLMN information or the second PLMN information from the response message or the inserted user data message.

Preferably, the obtaining module comprises: a second receiving unit, configured to detect, in the home location register, that the PLMN registered by the user equipment in the PS domain or the CS domain changes, or the stored user equipment is registered in the CS domain. When the PLMN is different from the PLMN registered by the PS domain, the second notification message is received from the home location register, where the second notification message carries the first PLMN information or the second PLMN information.

Preferably, the obtaining module includes: a second sending unit, configured to send an authentication data request to the home location register; and a third receiving module configured to receive the authentication data response information fed back by the home location register, where The authentication data response information is response information of the authentication data request, and the second obtaining unit is configured to acquire the first PLMN information or the second PLMN information from the authentication data response information.

According to the embodiment of the present invention, the first core network element uses the first PLMN information registered in the PS domain or the second PLMN information registered in the CS domain to select the user equipment according to the first PLMN information or the second PLMN information. The technical means of the PLMN registered in the PS domain or the CS domain solves the related art. The existing PLMN selection scheme may cause the PLMN selected by the CS domain and the PS domain to be different, thereby generating a difference in the call charge or the terminal displaying the operator name. The technical problem is to ensure that the CS domain and the PS domain are selected to the same PLMN, thereby avoiding the difference in call charges or the difference in the terminal display operator name, thereby improving the user experience.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a 3GPP network architecture diagram according to the related art;

2 is a schematic diagram of a core network and a wireless network shared according to the related art;

3 is a schematic diagram of a shared wireless only network according to the related art;

4 is a flowchart of a PLMN selection method of a PS domain and a CS domain according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart diagram of a PLMN selection method of a PS domain and a CS domain according to Embodiment 1 of the present invention; FIG.

6 is a schematic flowchart diagram of a PLMN selection method of a PS domain and a CS domain according to Embodiment 2 of the present invention;

7 is a structural block diagram of a PLMN selection apparatus of a PS domain and a CS domain according to an embodiment of the present invention;

FIG. 8 is a block diagram showing another structure of a PLMN selecting apparatus of a PS domain and a CS domain according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

4 is a flow chart of a PLMN selection method for a PS domain and a CS domain according to an embodiment of the present invention. As shown in FIG. 4, the method includes steps S402-S404:

Step S402, the first core network element acquires the first PLMN information registered in the PS domain, or the second PLMN information registered in the CS domain;

Step S404, the first core network element selects the first PLMN registered in the CS domain for the user equipment according to the first PLMN information, or selects the second PLMN registered in the PS domain for the user equipment according to the second PLMN information.

Through the above processing steps, since the first PLMN of the CS domain can be selected according to the first PLMN information of the PS domain or the second PLMN of the PS domain is selected according to the second PLMN information of the CS domain, the PS domain and the CS domain selection can be avoided. The PLMN is different, ensuring that the CS domain and the PS domain are selected to the same PLMN.

Step S402 can be implemented in multiple manners. For example, a network element can be set up (the network element knows and stores the first PLMN information or the second PLMN information), and the first core network element is obtained from the network element. In a preferred embodiment of the present embodiment, the first PLMN information or the second PLMN information may be obtained by: sending, by the first core network element, a location update request to the home location register; and triggering the location update request, The first core network element receives the response message of the location update request and the inserted user data message; the first core network element obtains the first PLMN information or the second PLMN information from the response message or the inserted user data message.

In another optional embodiment of the present invention, the first core network element sends an authentication data request to the home location register; and the first core network element receives the home location register triggered by the authentication data request The feedback data response information is fed back; the first core network element obtains the first PLMN information or the second PLMN information from the authentication data response information.

In another preferred implementation of step S402, the foregoing first PLMN information or the second PLMN information may also be obtained by:

When the home location register detects that the PLMN registered by the user equipment in the PS domain or the CS domain changes, or the stored PLMN of the user equipment registered in the CS domain is different from the PLMN registered in the PS domain, the first core network element receives a second notification message from the home location register, wherein the second notification message carries the first PLMN information or the second PLMN information.

In the foregoing process, the processing step of the first core network element sending a location update request to the home location register may be expressed as the following implementation process, but is not limited thereto:

The first core network element sends the location update request to the home location register every time the user accesses; or

When the user accesses the first core network element from the BSS or the RNC, the first core network element receives the first notification message from the BSS or the RNC, where the BSS or the RNC is indicated in the first notification message. The cooperative selection PLMN for the PS domain and the CS domain is not performed, and the first core network element transmits the location update request to the home location register. Here, "cooperative selection" means selecting the same PLMN in the PS domain and the CS domain.

In the foregoing process, the processing step of the first core network element sending the authentication data request to the home location register may be expressed as the following implementation process, but is not limited thereto:

The first core network element sends the authentication data request to the home location register every time the user accesses; or

When the user accesses the first core network element from the base station subsystem BSS or the radio network controller RNC, the first core network element receives the first notification message from the BSS or the RNC; wherein, in the A notification message indicates that the BSS or the RNC does not perform a coordinated selection of a PLMN for a PS domain and a CS domain, and the first core network element sends the authentication data request to the home location register.

Before the first core network element sends the location update request or the authentication data request to the home location register, the home location register needs to first acquire and store the first PLMN information or the second PLMN information, and the specific implementation process is as follows:

When the first core network element is an MSC or a VLR, the home location register receives a location update request from the SGSN, where the location update request carries the first PLMN information;

When the first core network element is an SGSN, the home location register receives a location update request from the MSC or the VLR, where the location update request carries the second PLMN information.

Step S404 is implemented in various manners. In a preferred implementation manner of this embodiment, the method may be: determining whether the first core network element supports the first PLMN or the second PLMN; The PLMN or the second PLMN, the first PLMN or the second PLMN is used as a final selection result; if the first PLMN or the second PLMN is not supported, the first core network element redirects the LAU process to the same The second core network element supporting the first PLMN or the second PLMN in the CS domain or the PS domain; the first PLMN or the second PLMN is selected by the second core network element for the user equipment, where Whether the core network element supports the first PLMN or the second PLMN may be the first core network element.

In the foregoing process, the first core network element redirects (Location Area Update, LAU for short) process to the second core network element supporting the first PLMN or the second PLMN in the same CS domain or PS domain. , can be achieved by, but not limited to, the following:

The first core network element sends a third notification message to the BSS or the RNC accessed by the user, where the third notification message carries the first PLMN information or the second PLMN information, and the foregoing is carried in the third notification message. The first PLMN information or the foregoing second PLMN information is used to provide the BSS or the RNC with the basis for selecting the second core network element, that is, the first PLMN information carried by the BSS or the RNC according to the third notification message or the foregoing The second PLMN information selects the second core network element.

The first PLMN information and the second PLMN information respectively include one of the following: an SGSN number, an MSC number or a VLR number, and a PLMN number for indicating the PLMN where the user equipment is located.

The home location register mentioned in the above embodiment may be an HLR, or an HSS supporting a function similar to the HLR, or other storage user subscription data, or other network element in which the user registers information in the PS domain or the CS domain.

In order to better understand the above embodiments, the following detailed description will be given in conjunction with the preferred embodiments.

Example 1

This embodiment may be applicable to the UE switching in the PS domain, and after the routing area update (Route Area Update, RAU for short) is performed on the target side, after the PS service ends, that is, the target side does not support the simultaneous connection between the PS service and the CS service. ), the process of updating the LAU in the location area is performed. This embodiment can also be applied to the UE switching in the PS domain, reaching the target side and not performing the RAU procedure, and performing a separate LAU procedure. At this time, steps S502 to S510 can be considered to be completed on the source side, that is, before the handover. Therefore, there is no strict time limit requirement after steps S502-S510 and subsequent steps S512.

Step S502, the UE initiates an RAU procedure.

Step S504, the SGSN initiates a location update request to the HLR/HSS after determining the PLMN for the UE. When the process occurs after the handover, the PLMN is selected by the source BSS/RNC and notified to the target SGSN by a Routing Area Identification (RAI). When the process is completed before the handover, the PLMN is the source BSS/RNC selection and is notified to the SGSN through the RAI. The location update request carries the identifier of the UE and the SGSN number. When the number can represent the PLMN of the UE, there is no need to carry a new PLMN ID indication. In some networks, the SGSN number may not accurately indicate the PLMN where the UE is located. The information element (Information Element, IE for short) may be required to notify the HLR/HSS and the PLMN information registered by the UE in the PS domain.

Step S506, the HLR/HSS records the PLMN information registered by the UE in the PS domain. The HLR/HSS inserts user data (Insert Subscriber Data) into the SGSN.

Step S508, the HLR/HSS returns a location update response message to the SGSN.

Step S510, the SGSN returns an RAU accept message to the UE. If the process is assigned a Packet Temporary Mobile Subscriber Identity (P-TMSI), the UE also needs to return a RAU Complete message to the network.

In the foregoing process, there may be other processes such as authentication, establishing a bearer, and canceling the location of the HLR/HSS to the old SGSN. These processes are well known to those skilled in the art and will not be described herein.

Step S512, the UE initiates the LAU, and the BSS/RNC selects the MSC/VLR1 for the UE.

In step S514, the MSC/VLR1 initiates a location update request to the HLR/HSS. The location update request carries the identifier of the UE and the SGSN number.

Step S516, the HLR/HSS inserts user data into the MSC/VLR1 according to the recorded PLMN information registered by the UE in the PS domain. The user data may contain PLMN information of the PS domain registered by the UE.

Step S518, the HLR/HSS returns a location update response message to the MSC/VLR1. If the PLMN information of the PS domain registered by the UE is not provided in step S516. Then the message includes the PLMN information of the PS domain registered by the UE.

Step S520, the MSC/VLR1 selects the PLMN information registered by the CS domain for the UE according to the PLMN information of the PS domain registered by the UE. If the MSC/VLR1 supports the PLMN, the MSC completes the remaining flow of the LAU. Otherwise MSC/VLR1 redirects the LAU to the MSC/VLR of the other PLMN. In this embodiment, it is assumed that it is not supported, and the subsequent steps are performed.

In the above process, there may be other processes such as authentication, obtaining the UE ID, and canceling the location of the HLR/HSS to the old MSC/VLR. These processes are well known to those skilled in the art, and on the other hand, the steps themselves are not related to the present embodiment. Big, omitted and not described.

Step S522, the MSC/VLR1 sends a redirect message to the BSS/RNC, where the redirected PLMNID, LAU message is required. If the BAS/RNC can buffer the previous LAU message, the message may not include the LAU message, and the related identifier of the LAU message is used to indicate that the BSS/RNC forwards the previously cached LAU message.

Step S524, the BSS/RNC selects a suitable MSC/VLR2 for the UE according to the PLMN ID. The BSS/RNC returns a redirect response message to the MSC/VLR1.

Step S526, the BSS/RNC sends a LAU message to the MSC/VLR2.

Steps S528 to S532, the MSC/VLR2 initiates a location update and a subscription data process to the HLR/HSS. Similar to steps S514 to S518, details are not described herein again.

In step S534, the MSC/VLR2 determines the selected PLMN for the UE.

Steps S536-S538, the MSC/VLR sends a LAU Receive message to the UE. If the message includes the TMSI allocated by the MSC/VLR2, the UE sends a LAU Complete message to the MSC/VLR2.

If the MSC/VLR does not change during the process of performing the LAU, the MSC/VLR may not initiate a location update request to the HLR/HSS, so that the PLMN registered in the PS domain cannot be obtained. Therefore, the embodiment further includes the following manner. The MSC/VLR obtains this parameter:

1. The MSC/VLR is required to always initiate a location update request to the HSS/HLR.

2. The BSS/RNC is required to notify the MSC/VLR in step X06 when the network selection for PS/CS domain coordination is not performed. When the MSC/VLR learns this information, it always initiates a location update request to the HSS/HLR.

3. The method in Embodiment 2 is employed. For details, refer to Embodiment 2, and details are not described herein again.

Example 2

This embodiment may be applicable to the UE performing handover in the PS domain. After the RAU is performed on the target side, after the PS service ends (that is, the target side does not support the simultaneous connection between the PS service and the CS service), the LAU process is performed. This embodiment can also be applied to the UE switching in the PS domain, reaching the target side and not performing the RAU procedure, and performing a separate LAU procedure. At this time, steps S602 to S614 can be considered to be completed on the source side, that is, before the handover. Therefore, there is no strict time limit requirement after steps S602-S614 and subsequent steps S616.

Step S602, the UE initiates an RAU process.

Step S604, the SGSN initiates a location update request to the HLR/HSS after determining the PLMN for the UE. When the process occurs after the handover, the PLMN is selected by the source BSS/RNC and notified to the target SGSN via the RAI. When the process is completed before the handover, the PLMN is the source BSS/RNC selection and is notified to the SGSN through the RAI. The location update request carries the identifier of the UE and the SGSN number. When the number can represent the PLMN of the UE, there is no need to carry a new PLMN ID indication. In some networks, the SGSN number may not accurately indicate the PLMN where the UE is located, and the IE may be required to notify the HLR/HSS and the PLMN information registered by the UE in the PS domain.

Step S606, the HLR/HSS records the PLMN information registered by the UE in the PS domain. The HLR/HSS inserts user data into the SGSN.

Step S608, the HLR/HSS returns a location update response message to the SGSN.

Step S610, the SGSN returns an RAU accept message to the UE. If this process allocates P-TMSI, the UE also needs to return a RAU Complete message to the network.

Step S612, when the HLR/HSS finds a PLMN change registered in the PS domain, or the HLR/HSS can simultaneously record the PLMN registered in the CS domain and the PLMN registered in the PS domain, when the two are different, the other domain is notified. The HLR/HSS sends a PLMN change notification message to the UE registered old (MSC) MSC/VLR, which carries the PLMN information registered by the PS domain. This message can be reused with existing location cancellation messages or other available messages, or by adding new messages. As long as the notification function is implemented, it is within the protection scope of the embodiment.

Step S614, the old MSC/VLR compares the PLMN information registered by the PLMN and the PS domain currently registered by the UE, and if not changed, the subsequent process is not performed. If there is a change, perform the next steps.

In step S616, the old MSC/VLR returns a notification response message to the HLR/HSS.

The UE initiates the LAU, and the BSS/RNC selects the MSC/VLR1 for the UE.

If the MSC/VLR1 is registered, that is, the old MSC/VLR and the MSC/VLR1 are the same network element, step S618 is directly performed. If the UE has not previously registered with the MSC/VLR1, steps S616a to s616b may be performed, or steps 407 to 419 of Embodiment 1 may be performed.

In step S616a, the MSC/VLR1 sends an acquisition identification request to the old MSC/VLR.

Step S616b, the old MSC/VLR returns an acquisition identity response to the MSC/VLR1, which carries the PLMN ID of the PS domain registered by the UE.

Step S618, the MSC/VLR1 selects the PLMN information registered by the CS domain for the UE according to the PLMN information of the PS domain registered by the UE obtained in step S614. If the MSC/VLR1 supports the PLMN, the MSC/VLR1 completes the remaining flow of the LAU. Otherwise MSC/VLR1 redirects the LAU to the MSC/VLR of the other PLMN. In this embodiment, it is assumed that it is not supported, and the subsequent steps are performed.

Steps S620 to S636 are similar to steps S522 to S538, and are not described herein.

It should be noted that in the first embodiment and the second embodiment, the PS domain is selected first, and the CS domain is selected as an example. In the actual deployment network, the possibility of selecting the PS domain after selecting the CS domain is not excluded. Therefore, when the scenario occurs, the new functions of the CS domain and the PS domain in the above process are similar, that is, the HSS/HLR is required to notify the SGSN of the UE in the CS domain registered by the UE in the above manner, and trigger the reselection of the SGSN.

Example 3

The applicable scope of this embodiment is similar to that of FIG. 5, and the flow of execution is similar. The difference is that steps 514 to 518 do not need to be executed at this time, but the MSC/VLR1 sends an authentication data request to the HLR, and the HSS returns to the MSC after receiving it. The authentication data response carries the PLMN information of the PS domain registered by the UE. The MSC/VLR1 selects the PLMN information registered by the CS domain for the UE according to the PLMN information of the PS domain. If the MSC/VLR1 supports the PLMN, the MSC completes the remaining flow of the LAU. Otherwise MSC/VLR1 redirects the LAU to the MSC/VLR of the other PLMN, performing the remaining steps after step 522 in FIG.

In addition, step 528 to step 532 can obtain PLMN information of the PS domain by using an authentication data request process.

Example 4

The applicable scope of this embodiment is similar to that of FIG. 6. The execution process is similar. The difference is that steps 626 to 630 do not need to be performed at this time, but the MSC/VLR2 sends an authentication data request to the HLR, and the HSS returns to the MSC after receiving the request. The authentication data response carries the PLMN information of the PS domain registered by the UE. The MSC/VLR2 selects the PLMN information registered by the CS domain for the UE according to the PLMN information of the PS domain.

In order to implement the foregoing method, a PLMN selection device in the PS domain and the CS domain is also provided in the embodiment, and the device is applied to the core network element for implementing the foregoing embodiment and the preferred embodiment. I will not repeat them here, and the modules involved in the device will be described below. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 7 is a structural block diagram of a PLMN selection apparatus of a PS domain and a CS domain according to an embodiment of the present invention. As shown in Figure 7, the device includes:

The obtaining module 70 is configured to acquire first PLMN information registered in the PS domain or second PLMN information registered in the CS domain;

The selecting module 72 is connected to the obtaining module 70, configured to select a first PLMN registered in the CS domain for the user equipment according to the first PLMN information, or select a second PLMN registered in the PS domain for the user equipment according to the second PLMN information.

Through the functions implemented by the above modules, it is also possible to ensure that the CS domain and the PS domain are selected to the same PLMN.

In this embodiment, the obtaining module 70, as shown in FIG. 8, includes the following processing unit: the first sending unit 700 is configured to send a location update request to the home location register; the first receiving unit 702 is connected to the sending unit 700, The first obtaining unit 704 is configured to receive the first PLMN information or the first user information from the response message or Two PLMN information.

Optionally, as shown in FIG. 8, the obtaining module 70 may further include: a second receiving unit 706, configured to detect, in the home location register, that the PLMN registered by the user equipment in the PS domain or the CS domain changes, or the stored user equipment When the PLMN registered in the CS domain is different from the PLMN registered in the PS domain, the second notification message is received from the home location register, where the second notification message carries the first PLMN information or the second PLMN information.

In an optional example of the present invention, as shown in FIG. 8, the obtaining module 70 includes: a second sending unit 708 configured to send an authentication data request to the home location register; and a third receiving module 710 connected to the second The sending unit 708 is configured to receive the authentication data response information fed back by the home location register, where the authentication data response information is the response information of the authentication data request, and the second obtaining unit 712 is connected to the third receiving unit 710. And configured to obtain the first PLMN information or the second PLMN information from the authentication data response information.

As described above, the above various modules involved in the embodiment can be implemented by software or by corresponding hardware. For example, each of the above modules may be in a processor, for example, each of the above modules is in a processor: a processor, comprising: an obtaining module 70 and a selecting module 72; or each of the above modules is in a corresponding In the processor: the acquisition module 70 is located in the first processor, and the selection module 72 is located in the second processor.

In another embodiment, software is also provided for performing the technical solutions described in the above embodiments and preferred embodiments.

In another embodiment, a storage medium is further provided, wherein the software includes the above-mentioned software, including but not limited to: an optical disk, a floppy disk, a hard disk, an erasable memory, and the like.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

According to the foregoing technical solution provided by the present invention, the first core network element uses the first PLMN information registered in the PS domain or the second PLMN information registered in the CS domain according to the first PLMN information or the second PLMN information. The device selects the technical means of the PLMN registered in the PS domain or the CS domain, and solves the related art. The existing PLMN selection scheme may cause the PLMN selected by the CS domain and the PS domain to be different. The technical problem that the difference in the call charge or the terminal indicates the name of the operator is different, so that the CS domain and the PS domain can be selected to the same PLMN, and the difference in the call charge or the difference in the operator name of the terminal is avoided.

Claims

A public land mobile telephone network PLMN selection method for a packet switched PS domain and a circuit switched CS domain, comprising:

The first core network element acquires first PLMN information registered in the PS domain, or second PLMN information registered in the CS domain;

The first core network element selects a first PLMN registered in the CS domain for the user equipment according to the first PLMN information, or selects a second PLMN registered in the PS domain for the user equipment according to the second PLMN information. .
The method according to claim 1, wherein the first core network element acquires the first PLMN information registered in the PS domain or the second PLMN information registered in the CS domain, including:

Transmitting, by the first core network element, a location update request to a home location register;

The first core network element receives a response message inserting a user data message and the location update request;

The first core network element acquires the first PLMN information or the second PLMN information from the response message or the inserted user data message.
The method of claim 2, wherein before the first core network element sends the location update request to the home location register, the method includes:

When the first core network element is a mobile switching center MSC or a visitor location register VLR, the home location register receives a location update request from a general packet radio service support node SGSN, wherein the location update request is carried Having the first PLMN information;

When the first core network element is an SGSN, the home location register receives a location update request from the MSC or the VLR, where the location update request carries the second PLMN information.
The method of claim 2, wherein the sending, by the first core network element, a location update request to the home location register comprises:

The first core network element sends the location update request to the home location register every time the user accesses; or

When the user accesses the first core network element from the base station subsystem BSS or the radio network controller RNC, the first core network element receives a first notification message from the BSS or the RNC; The first notification message indicates that the BSS or the RNC does not perform a cooperative selection PLMN for the PS domain and the CS domain, and the first core network element sends the location update request to the home location register.
The method according to claim 1, wherein the first core network element acquires the first PLMN information registered in the PS domain or the second PLMN information registered in the CS domain, including:

The first core network element sends an authentication data request to the home location register;

The first core network element receives the authentication data response information fed back by the home location register, where the authentication data response information is response information of the authentication data request;

The first core network element obtains the first PLMN information or the second PLMN information from the authentication data response information.
The method according to claim 5, wherein before the first core network element sends the authentication data request to the home location register, the method includes:

When the first core network element is an MSC or a VLR, the home location register receives a location update request from the SGSN, where the location update request carries the first PLMN information;

When the first core network element is an SGSN, the home location register receives a location update request from the MSC or the VLR, where the location update request carries the second PLMN information.
The method of claim 5, wherein the sending, by the first core network element, an authentication data request to the home location register comprises:

The first core network element sends the authentication data request to the home location register every time the user accesses; or

When the user accesses the first core network element from the BSS or the RNC, the first core network element receives a first notification message from the BSS or the RNC; wherein, the first notification message indicates The BSS or the RNC does not perform a cooperative selection PLMN for the PS domain and the CS domain, and the first core network element sends the authentication data request to the home location register.
The method according to claim 1, wherein the first core network element acquires the first PLMN information registered in the PS domain or the second PLMN information registered in the CS domain, including:

When the home location register detects that the PLMN registered by the user equipment in the PS domain or the CS domain changes, or the stored PLMN of the user equipment registered in the CS domain is different from the PLMN registered in the PS domain, the first core network The network element receives the second notification message from the home location register, where the second notification message carries the first PLMN information or the second PLMN information.
The method according to any one of claims 1 to 8, wherein the first core network element selects a first PLMN registered in a CS domain for a user equipment according to the first PLMN information, or according to the first The second PLMN information is used by the user equipment to select a second PLMN registered in the PS domain, including:

Determining whether the first core network element supports the first PLMN or the second PLMN;

If the first PLMN or the second PLMN is supported, the first PLMN or the second PLMN is taken as a final selection result;

If the first PLMN or the second PLMN is not supported, the first core network element redirects the location update LAU procedure to the same CS domain or the PS domain to support the first PLMN or the second PLMN a second core network element; the first PLMN or the second PLMN is selected by the second core network element for the user equipment.
The method of claim 9, wherein the first core network element redirects the location update LAU procedure to the same CS domain or the PS domain supports the first PLMN or the second core of the second PLMN Network element, including:

The first core network element sends a third notification message to the BSS or the RNC accessed by the user, where the third notification message carries the first PLMN information or the second PLMN information, and the third The first PLMN information or the second PLMN information carried in the notification message is used to select the second core network element for the BSS or the RNC.
The method according to any one of claims 1 to 8, wherein the first PLMN information and the second PLMN information each comprise one of the following:

It is used to indicate the SGSN number, MSC number or VLR number, and PLMN number of the PLMN where the user equipment is located.
A public land mobile telephone network PLMN selection apparatus for a packet switched PS domain and a circuit switched CS domain, applied to a core network element, comprising:

An obtaining module, configured to acquire first PLMN information registered in a PS domain, or second PLMN information registered in a CS domain;

And a selecting module, configured to select, according to the first PLMN information, a first PLMN registered in the CS domain for the user equipment, or select a second PLMN registered in the PS domain for the user equipment according to the second PLMN information.
The device of claim 12, wherein the obtaining module comprises:

a first sending unit, configured to send a location update request to the home location register;

a first receiving unit, configured to receive a response message of the location update request and insert a user data message;

The first obtaining unit is configured to acquire the first PLMN information or the second PLMN information from the response message or the inserted user data message.
The apparatus of claim 12, wherein the obtaining module comprises:

a second receiving unit, configured to detect, in the home location register, that the PLMN registered by the user equipment in the PS domain or the CS domain changes, or the stored PLMN of the user equipment registered in the CS domain is different from the PLMN registered in the PS domain Receiving a second notification message from the home location register, where the second notification message carries the first PLMN information or the second PLMN information.
The device of claim 12, wherein the obtaining module comprises:

a second sending unit, configured to send an authentication data request to the home location register;

a third receiving module, configured to receive the authentication data response information fed back by the home location register, where the authentication data response information is response information of the authentication data request;

And a second acquiring unit, configured to acquire the first PLMN information or the second PLMN information from the authentication data response information.