WO2003075593A1

WO2003075593A1 - A method that realizes network signaling intercommunication between gsm and cdma

Info

Publication number: WO2003075593A1
Application number: PCT/CN2002/000515
Authority: WO
Inventors: Guangbin Meng; Hao Ding; Jincheng Wang; Fajun Tan
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2002-03-01
Filing date: 2002-07-23
Publication date: 2003-09-12
Also published as: CN1200590C; AU2002318717A1; CN1443017A

Abstract

A method that realizes network signaling intercommunication between GSM and CDMA is disclosed, first, establish network connection between home location register GSM-HLR of GSM network and home location register CDMA-HLR of CDMA network, preserve respectively a signing contract information in both HLR for the mobile telephone that support the dual mode, and using one mobile subscriber number; increase the configuration of the other party network data in the whole network node, and establish internal communication protocol between GSM-HLR and CDMA-HLR when the mobile telephone subscriber roam crossover networks, in the implement of the method, in addition to necessary gateway device, without extra adding any other network entity, and without making complicated signaling conversion, implement easily, it may support great majority subscriber service widely, and partly support the data service after crossover networks.

Description

Method for realizing signaling interworking between GSM and CDMA networks

The present invention relates to mobile communication technology, and in particular, to a method for implementing interworking between GSM (Global System for Mobile Communications) and CDMA (Code Division Multiple Access Mobile Communication System) network signaling. Background technique

At present, the GSM network, which is dominant in the mobile communication field, and the CDMA network that is gradually emerging are relatively independent, that is, users of the GSM network cannot enjoy the services provided by CDMA, and users of the CDMA network cannot enjoy the services provided by GSM. In order to reduce call blind areas, improve network utilization, and achieve seamless roaming of mobile users between CDMA / GSM dual networks, it has become a task to be solved in the field of mobile communications. One of the necessary conditions for seamless dual network roaming is that the mobile phone can support both CDMA and GSM standards, and can choose CDMA or GSM functions according to the current network standard. The core component of the dual-mode SIM (identity identification module) card has been completed. s solution. For the solution of dual-network roaming on the core side on the network side, there are currently network interworking units IIF (Interoperabiity and Interworking Function) proposed by the CDMA standards organization. The basic principle of this solution is through the CDMA network and GSM. Network interworking units are added between networks to complete the mutual conversion of CDMA ANSI41 (Amer ican National Standard Institute) standards and GSM MAP (mobile application part of GSM network) signaling, so as to realize the authentication of roaming users, Call and SMS support. According to this method, when a GSM user roams to a CDMA network, the execution process is as follows: The dual-mode mobile phone first switches from the GSM mode to the CDMA mode, and uses CDMA standard signaling to perform service exchange with the network. At this time, IIF is responsible for converting CDMA message instructions into GSM instructions and submitting them to GSM-HLR (Home Location Register of GSM Network) for processing. On the other hand, it is also responsible for converting GSM-HLR instructions into CDMA instructions and submitting to mobile users. . At this moment, the IIF system acts as a CDMA-HLR (Home Location Register for the CDMA network) for mobile users, and as a mobile switching center and virtual home location register for the GMS-HLR.

The above method uses IIF to perform complex signaling translation, so that mobile users can achieve dual-network roaming using only one set of data in GSM subscription data or CDMA subscription data. At present, this solution has initially solved the unidirectional roaming problem of CDMA to GSM, but it also has the following disadvantages:

1) This method requires a separate IIF network entity to be added to the network, and its performance should be sufficient for the complicated signaling conversion between GSM and CDMA;

2) The impact on the running system is relatively large. Due to the inconsistency of the standard call flow between GSM and CDMA, in order to achieve dual network roaming, it is necessary to adjust the existing GSM / CDMA standard protocol, which is difficult to implement, has a long period, and is unstable. More

3) Support for non-essential services is difficult. Since the IIF solution uses signaling translation between dual networks, support for the most basic authentication services and voice services is not difficult to achieve, but the telecommunications market is constantly changing and increasing. New services, such as intelligent services and data services, have large differences in mechanisms in different networks. It is difficult for IIF to track and upgrade to achieve complete signaling conversion, which affects the dual-network compatibility of services.

Due to addictive reasons, most of the protocols of the IIF scheme are still in the discussion draft stage, and there is still a certain distance from the actual application. T picture 00515

-3- Summary of the Invention

An object of the present invention is to provide a method for implementing signaling interworking by establishing an internal communication mechanism between a GSM and a home location register of a CDMA network.

In order to achieve the above object, the technical solution adopted by the present invention is: A method for realizing signaling interworking between GSM and CDMA networks. First, the home location register GSM-HLR of the GSM network and the home location register CDMA-HLR of the CLA network are used. Establish a network connection between mobile phone users who support dual mode, and save a copy of the contract information in GSM- HLR and CDMA- HLR respectively; and establish mobile phone users between GSM- HLR and CDMA- HLR when roaming across the network Internal communication protocol, add dynamic identification bits to identify the user ’s current area attributes in the user contract data of the HLR on both sides, and add the configuration of the other party ’s network data to the network nodes in the entire network; then in GSM— HLR and CDMA— The processing of the above-mentioned internal communication protocol and dynamic identification bits is added to the MAP signaling processing flow of the HLR internal mobile application part, including:

Added the process of sending the roaming status of the home network to the non-home network during the location registration process; added the judgment of the user's current network to the process of obtaining the called location information; if the home network is the main network, the mobile service is exchanged according to the normal process The roaming number fed back by the central MSC is fed back to the gateway mobile switching center GMSC. If the network is a secondary network, the roaming number of the secondary network is fed back to the GMSC of the main network through an internal message between GSM-HLR and CDMA-HLR.

Because the above technical solutions are used to implement signaling interworking between the GSM and CDMA networks, the implementation of this method requires no additional network entities in addition to the necessary gateway equipment in the network, and does not perform complex signaling conversions. CDMA and GSM Signaling Agreement It is easy to implement, and it can support most user services extensively. It also partially supports data services after cross-network. '

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of the overall scheme of the method of the present invention;

FIG. 1 is a schematic diagram of a location registration process in the method of the present invention;

FIG. 3 is a schematic diagram of a mobile station cross-network called process in a specific embodiment of the method of the present invention;

Referring to FIG. 1, the basis and core of the present invention is to establish a network connection between the home location register GSM- HLR of the GSM network and the home location register CDMA- HLR of the CDMA network. For mobile phone users supporting dual mode, the GSM- HLR And CDMA- HLR each holds a piece of contract information; the essence of this method is to establish a virtual HLR with GSM- HLR and CDMA- HLR functions through physical channels and internal communication mechanisms, and each HLR hardware system and its own The signaling point encoding remains unchanged. The interface of the virtual HLR to the GSM network still follows the GSM standard signaling, and the interface to the CDMA network also follows the CDMA standard signaling. In order to ensure the speed and security of transmission, a dedicated line mode should be used to establish a network connection between GSM-HLR and CDMA-HLR, and the transmission rate should be selected to be more than 2M bytes per second. Based on the construction of the virtual HLR, an internal communication protocol between GSM- HLR and CDMA-HLR is formulated for mobile phone users when roaming across networks. Dynamics of attributes that identify the user's current area are added to the user contract data of both HLRs. Identification bit, and increase the configuration of the other party's network data in the network nodes, such as the mobile return center MSC as the gateway device shown in Figure 1, and the signaling transfer point STP, etc .; and then in GSM- HLR and CDMA- Added the above internal communication protocol and The processing of dynamic identification bits includes:

Added the process of sending the roaming status of the home network to the non-home network during the location registration process; added the judgment of the user's current network to the process of obtaining the called location information; if the home network is the main network, the mobile service is exchanged according to the normal process The roaming number fed back by the central MSC is fed back to the gateway mobile switching center GMSC. If the local network is a secondary network, the roaming number of the secondary network is fed back to the GMSC of the main network through an internal message between GSM-HLR and CDMA-HLR. After the above improvement, a virtual route is established between the two HLRs. The two networks request routing information from the corresponding HLR for the current user's roaming number through the routing message. After obtaining the roaming number, it feeds it back to the GMSC of the local network. The words i¾ 矣 continued.

As a specific embodiment of the present invention, each user in the subscription information has a different international mobile subscriber identity in the GSM-HLR and CDMA-HLR, and only uses one mobile subscriber number. When the mobile subscriber number is a GSM mobile subscriber number At this time, the user uses the GSM network as the main network and the CDMA network as the auxiliary network. When the mobile subscriber number is a CDMA mobile subscriber number, the subscriber uses a CDMA network as the main network and a GSM network as the auxiliary network. The internal communication protocol between the GSM-HLR and the CDMA-HLR includes a roaming status notification message and its response message, a callee routing notification message and its response message;

The GSM-HLR internal MAP signaling processing flow includes:

1) Location registration process: When the GSM-HLR receives a location registration request initiated by a dual-network roaming mobile phone through the GSM network mobile switching center GSM-MSC, it records the current roaming location, and then records the user's roaming status on the GSM network to dynamic And send a roaming status notification message to the CDMA-HLR to notify the CDMA-HLR that the user is currently roaming in the GSM-HLR; after receiving the CDMA-HLR roaming status response message, send it to the mobile phone Local service MSC issues contract information;

2) Response to the roaming status notification message: After the GSM-HLR receives the roaming status notification message from the CDMA-HLR, it records the user's roaming status into the dynamic identification bit according to the roaming status parameter in the message, and then reports to the CDMA-HLR Feedback roaming status response message;

3) The process of obtaining the called location information: After receiving the message of obtaining the called location sent by the GMSC, the GSM-HLR judges the roaming status parameters in the HLR. If the user is currently on the GSM network, it sends the good service to the called month. The MSC sends a roaming number instruction. When the GSM-HLR receives the temporary number of the GSM user fed back from the serving MSC, it sends it back to the GMSC through the called location response message; It is called a route notification message, and after the CDMA user temporary number is obtained by the CDMA-HLR, it is fed back to the GSM-HLR by taking the called routing response message, and the GSM-HLR is fed back to the GMSC by taking the called location response message;

4) Response to the called route notification message: After receiving the called route notification message from the CDMA-HLR, the GSM-HLR first sends a roaming number instruction to the serving MSC where the user is located to obtain the temporary number of the GSM user, and then Feedback to the CDMA-HLR by taking the called route response message;

The CDMA-HLR internal MAP signaling processing flow includes:

1) Location registration process: When the CDMA-HLR receives a location registration request initiated by a dual-network roaming mobile phone through the CDMA network's mobile switching center CDMA-MSC, it records the current roaming location, and then records the user's roaming status on the CDMA network to dynamic And sends a roaming status notification message to the GSM-HLR to notify the GSM-HLR that the user is currently in the CDMA-HLR Roaming status in the mobile phone; after receiving the roaming status response message of the GSM-HLR, it sends the contract information to the service MSC where the mobile phone is located;

2) Response to the roaming status notification message: After the CDMA-HLR receives the roaming status notification message from the GSM-HLR, it records the user's roaming status into the dynamic identification bit according to the roaming status parameter in the message, and then reports to the GSM -HLR feedback roaming status response message;

3) The process of obtaining the called location information: After receiving the message of obtaining the called location sent by the GMSC, the CDMA-HLR judges the roaming status parameters in the HLR. If the user is currently in the CDMA network, it sends the message to the serving MSC where the called party is located. The roaming number instruction, after receiving the temporary number of the CDMA user from the serving MSC, the CDMA-HLR sends the called location response message to the GMSC; if the user is currently on the GSM network, it sends a call routing notification to the GSM-HLR Message, the GSM-HLR obtains the temporary number of the GSM user, and then feeds it back to the CDMA-HLR through the call routing response message, and the CDMA-HLR feeds back to the GMSC through the call location response message;

4) Response to the called route notification message: After receiving the called route notification message from the GSM-HLR, the CDMA-HLR first sends a roaming number instruction to the serving MSC where the user is located to obtain the temporary number of the GSM user, and then Feedback to the GSM-HLR by taking the called route response message;

Referring to FIG. 2, a mobile station enters a CDMA service area from a GSM service area as an example to further explain the location registration process of the solution of the present invention:

Step 1: The user uses CDMA-IMSI (International Mobile Subscriber Identity) to initiate a CDMA standard location registration request to a virtual HLR constructed by GSM- HLR and CDMA- HLR;

Step 2: The virtual HLR uses the CDMA-HLR to receive the location request message and internally The message informs the GSM-HLR to cancel the location;

Step 3: After the GSM-HLR receives the internal status notification signaling, the MSC and VLR send a standard GSM location cancellation message;

Step 4: feedback the execution result of the location cancellation message according to the standard GSM signaling; Step 5: the GSM-HLR feedbacks the status execution result to the CDMA-HLR;

Step 6: The CDMA-HLR issues a service item list in the CDMA standard signaling format. The specific application of this embodiment is described below with reference to the called process after the mobile user crosses the network shown in FIG. 3, in which mobile station 1 calls mobile station 2 with the GSM mobile subscriber number of mobile station 2 on the GSM network. At this time, the mobile station 1 Roaming to a CDMA network.

Step 11: After the mobile station 1 initiates a call on the GSM network with the GSM mobile subscriber number of the mobile station 2, the GSM-MSC initiates a standard GSM route acquisition instruction to the GSM-HLR in the home HLR of the mobile station 2.

Step 12: The GSM-HLR first determines from the roaming status flag that the user is not in the GSM service area but in the CDMA service area, and then sends an internal location information message to the CDMA-HLR;

Step 1: 3: The CDMA-HLR sends a route acquisition instruction to the serving MSC and VLR (Visit Location Register) of mobile station 2;

Step 14: The serving MSC and VLR return the roaming number TLDN (temporary number for CDMA mobile subscribers) to the CDMA-HLR;

Step 15: the CDMA-HLR notifies the GSM-HLR of the TLM through an internal message;

Step 16: The GSM-HLR regards the TLDN as the GSM network standard temporary roaming number (MSRN), and returns it to the originating GSM-MSC in a response instruction for obtaining position information from the GSM; Step 17: GSM-MSC performs number analysis and judges that it is a temporary roaming number of the CDMA network, and then connects the voice channel to the gateway MSC;

Step 18: The CDMA gateway MSC determines that the number is a temporary roaming number of the CDMA network, and then establishes a speech path corresponding to the CDMA-MSC;

Because the GSM MSRN and C should use the same TLDN encoding method as A, the GSM-MSC can use the roaming number TLDN assigned by the CDMA-MSC to initiate a routing request through the corresponding signaling configuration.

In the solution of the present invention, since each user can use only one mobile subscriber number, number resources can be greatly saved.

Claims

Rights request

1. A method for implementing signaling interworking between GSM and CDMA networks, which is characterized in that: First, a network connection is established between the home location register GSM- HLR of the GSM network and the home location register CDMA- HLR of the CDMA network. Mobile phone users in the GSM-HLR mode and CDMA-HLR mode each save a copy of the contract information; and formulate the internal communication protocol between the GSM- HLR and CDMA- HLR when the mobile phone user roams across the network. The user's subscription data is added with a dynamic identification bit for identifying the attributes of the user's current area, and the configuration of the network data of the other party is added to the network node; and then the MAP signaling processing in the internal mobile application part of the GSM-HLR and CDMA-HLR Processing of the above-mentioned internal communication protocols and dynamic identification bits is added to the process, including:

Added the process of sending the roaming status of the home network to the non-home network during the location registration process; added the judgment of the user's current network to the process of obtaining the called location information; if the home network is the main network, the mobile service is exchanged according to the normal process The roaming number fed back by the central MSC is fed back to the gateway mobile switching center GMSC. If the network is a secondary network, the roaming number of the secondary network is fed back to the GMSC of the main network through an internal message between GSM- HLR and CDMA- HLR.

2. The method for implementing signaling interworking between GSM and CDMA networks according to claim 1, characterized in that: each user in the subscription information has a different international mobile subscriber identity in the GSM-HLR and the CDMA-HLR, And only one mobile subscriber number is used, the internal communication protocol between the GSM-HLR and the CDMA-HLR includes a roaming status notification message and its response message, a callee routing notification message and its response message;

The GSM-HLR internal MAP signaling processing flow includes: 1) Location registration process: When the GSM-HLR receives a location registration request initiated by a dual-network roaming mobile phone through the GSM network mobile switching center GSM-MSC, it records the current roaming location, and then records the user's roaming status on the GSM network to dynamic And send a roaming status notification message to the CDMA- HLR to notify the CDMA- HLR that the user is currently roaming in the GSM- HLR; after receiving the CDMA- HLR roaming status response message, the mobile phone service MSC is served. Issue contracting information;

2) Response to the roaming status notification message: After the GSM-HLR receives the roaming status notification message from the CDMA-HLR, it records the user's roaming status into the dynamic identification bit according to the roaming status parameter in the message, and then draws A to C -HLR feedback roaming status response message;

3) Process of obtaining the called location information: After receiving the message of obtaining the called location sent by the GMSC, the GSM-HLR judges the roaming status parameters in the HLR. If the user is currently on the GSM network, it sends the message to the serving MSC where the called location is located. Roaming number instruction. After the GSM-HLR receives the temporary number of the GSM user returned by the serving MSC, it sends the called location response message to the GMSC. If the user is currently on the CDMA network, the GSM-HLR sends a call routing notification to the CDMA-HLR. Message, the CDMA-HLR obtains the temporary number of the CDMA user, and then feeds it back to the GSM-HLR through the call routing response message, and the GSM-HLR feeds back to the GMSC through the call location response message;

4) Response to the called route notification message: After receiving the called route notification message from the CDMA-HLR, the GSM-HLR first sends a roaming number instruction to the serving MSC where the user is located to obtain the temporary number of the GSM user, and then Feedback to the CDMA-HLR by taking the called route response message; The CDMA-HLR internal MAP signaling processing flow includes:

1) Location registration process: When the CDMA-HLR receives a location registration request initiated by a dual-network roaming mobile phone through the CDMA network's mobile switching center CDMA-MSC, it records the current roaming location, and then records the user's roaming status on the CDMA network to dynamic And send a roaming status notification message to the GSM-HLR to notify the GSM-HLR that the user is currently roaming in the CDMA-HLR; after receiving the GSM-HLR roaming status response message, the mobile phone service MSC is served. Issue contracting information;

2) Response to the roaming status notification message: After the CDMA-HLR receives the roaming status notification message from the GSM-HLR, it records the user's roaming status into the dynamic identification bit according to the roaming status parameter in the message, and then reports to the GSM-HLR Feedback roaming status response message;

3) Process of obtaining the called location information: After receiving the message of obtaining the called location sent by the GMSC, the CDMA-HLR judges the roaming status parameters in the HLR. If the user is currently in the CDMA network, it sends the message to the serving MSC where the called location is located. The roaming number instruction, after the CDMA-HLR receives the temporary number of the CDMA user fed back by the serving MSC, it sends it back to the GMSC by taking the called location response message; if the user is currently on the GSM network, it sends the called route to the GSM-HLR The notification message is obtained by the GSM-HLR after receiving the temporary number of the GSM user, and is fed back to the CDMA-HLR by taking the called routing response message, and the CDMA-HLR is fed back to the GMSC by taking the called location response message;

4) Response to the route call notification message: After receiving the route call notification message from the GSM-HLR, the C-A-HLR first sends a roaming number instruction to the serving MSC where the user is located to obtain the temporary number of the GSM user. And then feedback to the GSM-HLR by taking the called route response message; 3. The method for realizing signaling interworking between GSM and CDMA networks according to claim 1, characterized in that: one mobile user number used by each user is a GSM mobile user number, and the user uses a GSM network as the main network, Take CDMA network as auxiliary network.

4. The method for implementing GSM and C picture A network signaling interworking according to claim 1, characterized in that: one mobile user number used by each user is a CDMA mobile user number, and the user is mainly a CDMA network Network, with GSM network as auxiliary network.

5. The method for realizing signaling interworking between GSM and CDMA networks according to claim 1, characterized in that: the home location register GSM_HLR in the GSM network and the home location register CLi A_HLR in the C leg A network A dedicated line is used to establish a network connection between them.