WO2003075592A1 - Method for signalling interworking between gsm and cdma networks - Google Patents

Abstract

The present invention discloses a method for realizing signalling interworking between GSM and CDMA networks. First, network connection is establish between home location registers of GSM (GSM-HLR) and home location registers of CDMA(CDMA-HLR). For mobile subscribers supporting dual mode, information of subscription is stored in the HLRs of both sides separately, and the configuration of network data to the other side is increased in the network nodes of whole networks, further more, the inner communications protocol is constituted between GSM-HLR and CDMA-HLR when mobile subscribers are cross-network roaming. Additional network entities is not required except for necessary gateway devices when using this method, and complex signalling conversion is also not required. The implement of this method is not difficult. This method can widely support most subscriber services and partly support data services after cross-network.

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 is already complete. s solution. For the solution of dual-network roaming on the core side on the network side, currently there are mainly network interworking units IIF (Interoperabity 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 (American National Standard Institute) standards and GSM MAP (mobile application part of GSM network) signaling, so as to implement authentication for 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, I IF 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. user. At this moment, the I IF system functions as a CDMA-HLR (Home Location Register of the CDMA network) for mobile users, and as a mobile switching center and virtual home location register for GMS-HLR.

 The above method is to perform complex signaling translation through IIF, 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 very different mechanisms in different networks, and it is difficult for IIF to track and upgrade to achieve complete signaling conversion, which affects the Chinese network compatibility of services;

Based on the above 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. 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 interworking between GSM and CDMA network signaling. First, between a home location register GSM-HLR of a GSM network and a home location register CDMA-HLR of a CDMA network Establish a network connection. For mobile phone users who support dual mode, one contract data is saved in each of the GSM-HLR and CDMA-HLR, and the mobile user numbers in the two contract data are forwarded numbers to each other; The internal communication protocol between GSM- HLR and CDMA- HLR when the network is roaming. In the user contract data of both HLRs, a dynamic identification bit for identifying the attributes of the user's current area and a record of the user's forwarding in the other's network are added. Forward the number field of the number, and increase the configuration of the other party ’s network data in the network nodes of the entire network; then add the internal communication protocol and dynamic identification in the MAP signaling processing flow of the internal mobile application part of the GSM-HLR and CDMA-HLR Bit processing, 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 returned by the central MSC is fed back to the gateway mobile switching center GMSC. If the network is a secondary network, the mobile subscriber number of the main network recorded in the forwarded number domain is fed back to the GMSC by taking the called location response message.

Because the above technical solutions are used to implement signaling interworking between the GSM and CDMA networks, the implementation in the network requires no additional network entities in addition to the necessary gateway equipment. In addition, it does not perform complicated signaling conversion, maintains the existing CDMA and GSM signaling protocols, and is easy to implement. It can widely support most user services and partially support data services after cross-network.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of the overall scheme of the method of the present invention;

 2 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 core of the present invention and the core 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 stores one contract data each, and the mobile subscriber numbers in the two contract data are forward numbers to each other; the essence of this method is to establish both GSM- HLR and CDMA- HLR functions through physical channels and internal communication mechanisms. The virtual HLR, while the hardware system of each HLR and its respective signaling point code remain unchanged. The interface of the virtual HLR to the GSM network still follows the GSM standard signaling, and the interface to the C Band A network also follows the CDMA standard signaling. In order to ensure the speed and security of transmission, a dedicated line mode should be adopted to establish a network connection between GSM-HLR and CDMA-HLR. 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 the network, and dynamics of attributes that identify the user's current area are added to the user contract data of both HLRs. The identification bit and the forwarding number field used to record the user's forwarding number in the other party's network, and the configuration of the other party's network data is added to the entire network node, such as The mobile return center MSC shown in FIG. 1 as the gateway device, and the signaling transfer point STP, etc .; and then the GSM-HLR and CDMA-HLR internal mobile application part of the MAP signaling processing flow is added to the above internal communication protocols and dynamics. The processing of the flags 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 returned by the central MSC is fed back to the gateway mobile switching center GMSC. If the network is a secondary network, the mobile subscriber number of the main network recorded in the forwarded number domain is fed back to the GMSC by taking the called location response message.

 The internal communication protocol between the GSM-HLR and the CDMA-HLR includes a roaming status notification message and its response message, a callee location 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 sends 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, it serves the MSC to the mobile phone location 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 reports to the CA- 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 message to the serving MSC where the called party is located. Get roaming number instruction. After the GSM-HLR receives the temporary number of the GSM 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 in the CDMA network, the CDMA mobile user recorded in the forwarding number field The number is fed back to the GMSC by taking the called location 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 in 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 roaming status response message from the GSM-HLR, the service is provided to the mobile phone location MSC issues contract 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) 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, the response is obtained by obtaining the called location response message. To the GMSC; if the user is currently on the GSM network, the GSM mobile user number recorded in the forwarded number field is fed back to the GMSC by taking a called location response message.

Referring to FIG. 2, taking a mobile station entering a CDMA service area from a GSM service area as an example, the location registration process of the solution of the present invention is further described: Step 1: The user initiates a CDMA standard location registration request with a CDMA-IMSI (International Mobile Subscriber Identity) 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 notifies the GSM-HLR to cancel the location through an internal message;

 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 feeds back the status execution result to the CDMA-HLR;

 Step 6: The CDMA-HLR issues a list of service items 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 2 Roam to the 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 judges that the user is not in the GSM service area but in the CDMA service area through the roaming status flag, and then submits the user's CDMA mobile user number to the GSM-HLR as a forward number;

 Step 13: The GSM-MSC determines that the forwarded number is a CDMA number, and then connects the voice channel to the gateway MSC;

Step 14: After the CDMA gateway MSC analyzes, according to the standard CDMA process, initiate a location acquisition message to the mobile station 2's home HLR; Step 15: The CDMA-HLR sends a route acquisition instruction to the serving MSC of the mobile station 2; Step 16: The serving MS C of the mobile station 2 returns the roaming number in the C DM A format to the CDMA-HLR;

 Step 17: The CDMA-HLR feeds back the roaming number in the CDMA format to the gateway MSC; Step 18: The gateway MSC establishes a route to the CDMA-MSC according to the roaming number in the CDMA format;

 In the implementation of the method of the present invention, the mobile subscriber number of the secondary network can also be used as the forward number of the primary network.

Claims

Rights request  1. A method for implementing signaling interworking between GSM and CDMA networks, which is characterized by: 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 mode hold one contract data each in GSM- HLR and CDMA-HLR; the mobile user numbers in the two contract data are forward numbers to each other; and the mobile phone users are defined in GSM- HLR when roaming across the network. The internal communication protocol with CDMA- HLR adds a dynamic identification bit to identify the user ’s current area attributes and a forwarding number field to record the user ’s forwarding number in the other's network in the user contract data of both HLRs. And the configuration of the network data of the other party is added in the network nodes of the entire network; then the processing of the above-mentioned internal communication protocols and dynamic identification bits is added to the MAP signaling processing flow of the internal mobile application part of GSM- HLR and CDMA- HLR, 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 returned by the central MSC is fed back to the gateway mobile switching center GMSC. If the network is a secondary network, the mobile subscriber number of the main network recorded in the forwarded number domain is fed back to the GMSC by taking the called location response message.  2. The method for realizing signaling interworking between GSM and CDMA networks according to claim 1, wherein: the internal communication protocol between the GSM-HLR and the CDMA-HLR includes a roaming status notification message and a response message thereof; 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 reports to the CDMA-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. Get roaming number instruction. After the GSM-HLR receives the temporary number of the GSM 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 in the CDMA network, the CDMA mobile user recorded in the forwarding number field The number is fed back to the GMSC by taking the called location 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 roaming status response message from the GSM-HLR, send it to the mobile phone Local service MSC issues contract 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 called location information: CDMA-HLR judges the roaming status parameter in HLR after receiving the message of obtaining called location sent by GMSC. If the user is currently in the CDMA network, Feedback to the GMSC by taking the called location response message; if the user is currently on the GSM network, send the GSM mobile subscriber number recorded in the forwarded number field to the GMSC by taking the called location response message.  3. The method for implementing GSM and CDMA network signaling interworking according to claim 1 or 2, characterized in that: the mobile subscriber number of the secondary network is used as the forward number of the primary network.  4. The method for implementing signaling interworking between GSM and CDMA networks according to claim 1, characterized in that: the network is established between a home location register GSM-HLR of the GSM network and a home location register CDMA-HLR of the CDMA network. Connection is by dedicated line.