CN1753553A - Interactive method of double mode mobile terminal and mobile network - Google Patents

Abstract

The invention discloses a method for interacting between a dual-mode mobile terminal and a mobile network. The method separates circuit domain functions from data domain functions; simultaneously measures first and second mobile communication system signals respectively, if the first mobile communication system signal If the coverage is poor but the signal coverage of the second mobile communication system is good, send or receive circuit domain services and data domain services through the second mobile communication system network; A mobile communication system network sends or receives circuit domain services, while a second mobile communication system network sends or receives data domain services; The first mobile communication system network sends or receives circuit domain services and data domain services. The method provides the circuit domain service and the data domain service for the user at the same time, and guarantees the service quality of the circuit domain service.

Description

Method for interaction between a dual-mode mobile terminal and a mobile network

technical field

The invention relates to mobile communication technology, in particular to a method for interaction between a dual-mode mobile terminal and a mobile network.

Background technique

With the continuous development of mobile communication technology, mobile communication is currently in a transformation period from the second generation mobile communication system, such as the Global System for Mobile Communications (GSM), to the third generation mobile communication system that can provide higher rate services.

In the third generation mobile communication system, Wideband Code Division Multiple Access (WCDMA) technology is one of the mainstream technologies. Moreover, with the continuous development of WCDMA technology and the continuous expansion of WCDMA network scale, various high-speed data services and other special services that WCDMA networks can provide attract more and more users, such as multimedia services, videophones, etc. , web browsing, high-speed downloads, and more. However, in the early stage of WCDMA network construction, its coverage cannot reach the level of GSM network coverage, resulting in the situation that users cannot use WCDMA networks in some places, which has become a big obstacle for users to choose WCDMA networks.

In addition, during the transition from the second-generation mobile communication system to the third-generation mobile communication system, a 2.5G mobile communication system represented by General Packet Radio Service (GPRS) also appeared. GPRS technology uses the same frequency band, frequency bandwidth, and the same time-division multiplexing frame structure as GSM, and can provide higher data rates than GSM networks, thereby providing users with data services such as web browsing and email. , has also become an option for users during the transition period.

In view of this, in order to adapt to the development of mobile communication technology, provide users with a variety of high-speed data services, and at the same time overcome the problem of small scale of the newly built third-generation mobile communication system, many mobile equipment manufacturers have launched The dual-mode or multi-mode mobile terminal of the third-generation mobile communication system, this dual-mode or multi-mode mobile terminal can work in the second-generation mobile communication system or in the third-generation mobile communication system, and can realize the first Migration and handover between the second generation mobile communication system and the third generation mobile communication system. In this way, the user can only carry one mobile terminal, and choose the mobile communication system with which he wants to communicate. Using the above-mentioned dual-mode or multi-mode mobile terminals, in areas with good third-generation mobile communication network coverage, users can be guaranteed to perform multiple high-speed data services; while in areas with poor third-generation mobile communication network coverage, still Can guarantee the user to carry on the common voice service.

For example, a GSM/WCDMA dual-mode terminal can provide users with a variety of high-speed data services through the WCDMA network in areas with good WCDMA network coverage, and provide users with ordinary data services through the GSM network in areas with no WCDMA network coverage or weak signals. voice services, thereby avoiding the possible interruption of 3G terminal communication due to the small coverage of the WCDMA network. Wherein, the above-mentioned GSM/WCDMA dual-mode terminal can be further combined with GPRS technology, so that in the case of no WCDMA signal coverage, it can still provide users with a certain rate of data services through GPRS.

At present, there are many types of dual-mode or multi-mode mobile terminals, and the application fields and implementation methods are also different. As far as the GSM/WCDMA dual-mode terminal is concerned, it must contain at least the GSM baseband and radio frequency components and the WCDMA baseband and radio frequency components in order to receive and transmit signals on the GSM network and the WCDMA network. Generally, existing GSM/WCDMA dual-mode terminals can automatically or manually implement user migration between the GSM network and the WCDMA network. The specific description is: if the current GSM/WCDMA dual-mode terminal resides in the GSM network, the GSM/WCDMA dual-mode terminal can transmit or receive signals through the GSM baseband and radio frequency components, and perform ordinary voice services, while the WCDMA baseband and radio frequency components are not connected. Do not work at the same time. However, the GSM/WCDMA dual-mode terminal can measure the pilot signal of the WCDMA network to determine whether network migration is possible. If migration is required and the migration conditions are met, the GSM network will automatically or receive user instructions to migrate the user to the WCDMA network. In this case, users can enjoy a variety of high-speed data services through the WCDMA network. If the current GSM/WCDMA dual-mode terminal resides in the WCDMA network, the GSM/WCDMA dual-mode terminal sends and receives signals through the WCDMA baseband and radio frequency components, and the WCDMA network carries voice and other high-speed data services, and, through the transmission channel The multiplexing technology multiplexes voice and other high-speed data services on the same transmission channel, while the GSM baseband and radio frequency components do not work at the same time. However, the GSM/WCDMA dual-mode terminal can measure the pilot signal of the GSM network. If relocation is required and the relocation conditions are met, the user will be relocated to the GSM network, and the GSM network will carry the voice service, while the GPRS network will carry the data service.

Therefore, although the existing GSM/WCDMA dual-mode terminal can be applied to both the GSM network and the WCDMA network, but because the existing GSM/WCDMA dual-mode terminal cannot use the GSM network and the WCDMA network at the same time, the user cannot simultaneously Get service on GSM network and WCDMA network. When the GSM/WCDMA dual-mode terminal resides on the GSM network and the user needs high-speed data services, since GSM cannot support high-speed data services, the GSM network must first automatically or manually migrate the user's mobile terminal to the WCDMA network , and then high-speed data services can be performed, which will increase the access delay of data services. When the GSM/WCDMA dual-mode terminal resides in the WCDMA network and the user needs to perform ordinary voice services, under normal circumstances, according to the operator's operating procedures, the WCDMA network needs to first switch the ordinary voice services through the handover process between systems. to the GSM network, and then the GSM network bears the corresponding ordinary voice services. However, because the success rate of inter-system switching is not very ideal, it will not only increase the call drop rate of voice services when using the existing dual-mode mobile phones, Moreover, the access delay of the voice service will be generated.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention provides a method for interacting between a dual-mode mobile terminal and a mobile network, which can enable a dual-mode mobile terminal to work in two communication networks at the same time, and can simultaneously provide users with circuit domain services and data Domain business, and guarantee the service quality of circuit domain business.

In the method of the present invention, the circuit domain function and the data domain function of the dual-mode mobile terminal are respectively realized by the circuit domain unit for processing the voice service and the data domain unit for processing the data service and the special circuit domain service of the third generation mobile communication system ;

The method performs the following steps when the dual-mode mobile terminal is in a power-on state:

a. The circuit domain component of the dual-mode mobile terminal searches and measures the network signal of the first mobile communication system, and the data domain component searches and measures the network signal of the second mobile communication system;

b. The dual-mode mobile terminal judges the current mobile communication network with good signal coverage according to the measurement results. If the first mobile communication system network signal coverage is poor, and the second mobile communication system network signal coverage is good, then perform step c; if the first mobile communication system network signal coverage is good, and the network signal coverage of the second mobile communication system are both good, then perform step d; if the network signal coverage of the first mobile communication system is good, but the network signal coverage of the second mobile communication system is poor, then perform step e;

c. The dual-mode mobile terminal sends or receives circuit domain services and data domain services unique to the third generation mobile communication system through the network of the second mobile communication system, and then returns to step a;

d. The dual-mode mobile terminal sends or receives voice services through the first mobile communication system network, and sends or receives data domain services and circuit domain services specific to the third-generation mobile communication system through the second mobile communication system network, and then returns to step a ;

e. The dual-mode mobile terminal sends or receives voice services and data services through the first mobile communication system network, and then returns to step a.

The above-mentioned first mobile communication system is a GSM mobile communication system; the second mobile communication system is a WCDMA mobile communication system.

The data domain part of the dual-mode mobile terminal includes a GPRS functional module, and closes the WCDMA voice service function;

Said step e is: the dual-mode mobile terminal sends or receives the data domain service via the GSM network through the GPRS function module in the data domain component, and sends or receives the voice service via the GSM network.

The dual-mode mobile terminal described in step d sends the circuit domain service through the GSM network, and the method for sending the data domain service through the WCDMA network includes the following steps:

After d1, the business data of the circuit domain and the data domain generated by the application layer of the dual-mode mobile terminal are submitted to the network layer of the circuit domain component and the data domain component for processing;

d2. The network layer of the circuit domain component and the data domain component respectively maps the circuit domain service and the data domain service to different logical channels, and then submits them to the data link layer of the circuit domain component and the data domain component respectively;

d3. The data link layer of the circuit domain component and the data domain component respectively maps the logical channels described in step d2 to different transmission channels, and frames them respectively, and then submits them to the physical layers of the circuit domain component and the data domain component respectively;

d4, the physical layer of the circuit domain component and the data domain component, map the circuit domain service and data domain service after the framing described in step d3 to different physical channels, and send them by the radio frequency devices of the circuit domain component and the data domain component respectively to GSM network and WCDMA network.

The method for the dual-mode mobile terminal described in step d to receive the circuit domain service through the GSM network, and to receive the data domain service through the WCDMA network is as follows:

The circuit domain part and the data domain part of the dual-mode mobile terminal respectively receive the circuit domain service and the data domain service from the GSM network and the WCDMA network, perform corresponding reception processing, and then submit to the application layer of the dual-mode mobile terminal.

The method further includes: setting the home location register of the dual-mode mobile terminal to support the dual-mode mobile terminal to simultaneously attach to the mobile switching center of the GSM network, the mobile switching center of the WCDMA network, and the WCDMA or GPRS network service support node superior;

When the dual-mode mobile terminal is called, the home location register of the dual-mode mobile terminal routes the ordinary call voice service call to the corresponding mobile exchange of the GSM network attached to the dual-mode mobile terminal according to the call service type. On the center; route the third-generation mobile communication circuit domain service call to the corresponding mobile switching center of the WCDMA network to which the dual-mode mobile terminal is attached; route the data domain service call to the WCDMA network to which the dual-mode mobile terminal is attached Or GPRS network service support node.

The circuit domain service of the third generation mobile communication system is specifically a videophone service.

The method further includes: setting the priority of the GSM/GPRS cell to be lower than that of the WCDMA cell, and the WCDMA system supports joint location update; and preferentially selecting the WCDMA cell when updating the location.

The method further includes: the circuit domain part and the data domain part of the dual-mode mobile terminal share the same International Mobile Subscriber Identity.

It can be seen from this that the following beneficial effects can be obtained by applying the method for cooperating between a dual-mode mobile terminal and a mobile network according to the present invention:

1. The dual-mode mobile terminal of the present invention frames the circuit domain service and the data domain service separately, realizes the separation of the circuit domain service and the data domain service on the physical layer, and uses GSM radio frequency components and WCDMA radio frequency components to transmit and receiving, realize the simultaneous operation of the GSM component and the WCDMA component of the dual-mode mobile terminal, and the user can receive or send the circuit domain service and the data domain service at the same time;

2. Through the interaction method between the dual-mode mobile terminal and the mobile network described in the present invention, the circuit domain component first searches for GSM network signals, and resides in the circuit domain service in the GSM network instead of migrating to the WCDMA network, ensuring Service quality of circuit domain services such as voice;

3. Through the interaction method between the dual-mode mobile terminal and the mobile network described in the present invention, the data domain component searches for WCDMA network signals preferentially, which can provide users with high-speed data services without affecting the quality of user voice services; When the WCDMA network signal is weak, the data domain service is migrated to the GSM network, and some data domain services are realized through GPRS components.

Description of drawings

Fig. 1 is the flowchart of the dual-mode mobile terminal and mobile network interaction method described in the present invention;

Fig. 2 is a flowchart of a method for sending circuit domain service and data domain service data by a dual-mode mobile terminal according to the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

Compared with the existing dual-mode terminal, the dual-mode terminal of the present invention uses basically the same hardware components. For example: GSM/WCDMA dual-mode terminal, including GSM baseband and radio frequency components, WCDMA baseband and radio frequency components, and GPRS baseband and radio frequency components. It should be noted that the radio frequency components of the GPRS may share the radio frequency components of the GSM, or use a separate radio frequency component of the GPRS.

The dual-mode mobile terminal of the present invention recombines the functions of the above-mentioned components on the basis of the existing dual-mode terminal, and re-divides functions into circuit domain components and data domain components. Wherein, the circuit domain component includes the above-mentioned GSM baseband and radio frequency components, and the circuit domain component supports the GSM function, but does not support the GPRS function. The dual-mode mobile terminal interacts with the GSM network through the circuit domain component. The data domain part includes the above-mentioned WCDMA baseband and radio frequency parts, and the data domain part supports the circuit domain function of the WCDMA system, the data domain function of the WCDMA system and the GPRS function. The dual-mode mobile terminal interacts with the GSM network through the GPRS function of the data domain component or interacts with the WCDMA network through the WCDMA circuit domain or data domain function of the data domain component. Wherein, the circuit domain function of the above-mentioned WCDMA system includes 3G characteristic circuit domain services such as the CS 64k service of videophone, and does not include ordinary voice services, that is, the dual-mode terminal mobile described in the present invention closes WCDMA in the data domain part. Common voice service functions in the circuit domain function, so as to ensure that common voice services always reside in the GSM network.

Both the circuit domain part and the data domain part of the dual-mode mobile terminal in the present invention include the functions of the physical layer, the data link layer and the network layer. Among them, the network layer of circuit domain components and data domain components implements functions such as mapping from user data to logical channels and radio resource management; the data link layer implements functions such as mapping from logical channels to transport channels, multiplexing of transport channels, and data framing ; while the physical layer implements the mapping of transmission channels to physical channels, signal modulation, demodulation and other functions.

In addition, both the data domain part and the circuit domain part of the above-mentioned dual-mode mobile terminal use the same International Mobile Subscriber Identity (IMSI) as their own identification.

The above-mentioned GSM/WCDMA dual-mode terminal realizes that its circuit domain components and data domain components work simultaneously through the interaction process with the GSM network and the WCDMA network. FIG. 1 is a flowchart of a method for interacting between a dual-mode mobile terminal and a mobile network according to the present invention. As shown in Figure 1, the method of the present invention enters step 101 after the GSM/WCDMA dual-mode terminal is turned on:

Step 101: GSM/WCDMA dual-mode terminal circuit domain components search and measure GSM network signals, data domain components search and measure WCDMA network signals;

In this step, since the GSM/WCDMA dual-mode terminal supports the measurement of different systems, when the GSM/WCDMA dual-mode terminal resides in the GSM network, the GSM/WCDMA dual-mode terminal can measure WCDMA adjacent cells; And when the GSM/WCDMA dual-mode terminal resides in the WCDMA network, it can also measure adjacent cells in the GSM network, and judge whether migration or handover is possible according to the measurement results.

Step 102: The GSM/WCDMA dual-mode terminal judges the mobile communication network with good current signal coverage according to the measurement results, if the GSM network signal coverage is poor, and the WCDMA network signal coverage is good, then perform step 103; if the GSM network and WCDMA network signals are both If the coverage is good, then step 104 is performed; if the GSM network signal coverage is good, but the WCDMA network signal coverage is poor, then step 105 is performed;

Due to the actual situation of the current mobile communication system coverage: GSM network coverage is wider than WCDMA network coverage, therefore, generally there will be no situation where GSM network signal coverage is poor, while WCDMA network signal coverage is good, that is, it is usually not implemented. Step 103.

Step 103: 3G characteristic circuit domain services and data domain services are carried by the WCDMA network, that is, receive or send 3G characteristic circuit domain services and data domain services through the WCDMA network, and then return to step 101;

In this step, the GSM/WCDMA dual-mode terminal interacts with the mobile network through the WCDMA network, and the GSM/WCDMA dual-mode terminal sends and receives 3G characteristic circuit domain service data and data domain service data with the base station Node B of the WCDMA network The method of sending and receiving in the prior art is the same; wherein, the circuit domain service with 3G characteristics includes videophone CS 64k service, etc.;

Because the GSM/WCDMA dual-mode terminal described in the present invention closes the ordinary voice service function in the WCDMA circuit domain function in the data domain part, like this, the result that causes will be: if the GSM signal coverage is relatively poor in the location area where the current user is located And WCDMA signal coverage is better, users will not be able to carry out the most basic voice service; With the continuous development of voice service over IP (VoIP) technology, the voice service carried in the data domain component can also guarantee high quality. Therefore, even if the above situation occurs, turning off the common voice service function of the circuit domain service will not affect the local network. Implementation of the invention.

Step 104: The voice service is carried by the GSM network, the data domain service and the circuit domain service with 3G characteristics are carried by the WCDMA network, and the GSM/WCDMA dual-mode terminal realizes the interaction with the mobile network through the GSM network and the WCDMA network at the same time, and then returns to step 101;

In this step, the circuit domain part and the data domain part of the GSM/WCDMA dual-mode terminal can receive, transmit and process GSM or WCDMA signals respectively at the same time.

Step 105: the voice service is carried by the GSM network, and the data domain service is sent or received via the GSM network through the GPRS functional module in the data domain component, and then returns to step 101;

In this step, the GSM/WCDMA dual-mode terminal realizes the interaction with the mobile network through the GSM network, and the GSM/WCDMA dual-mode terminal sends and receives circuit domain The method of sending and receiving service data or data field service data is the same as that in the prior art.

It can be seen from step 104 that the GSM/WCDMA dual-mode terminal of the present invention can carry the circuit domain service and the data domain service on the GSM network and the WCDMA network at the same time, instead of multiplexing the two services into the same transmission transmission on the channel.

Fig. 2 is a flowchart of a method for sending circuit domain service data and data domain service data by a dual-mode mobile terminal according to the present invention. As shown in Figure 2, the GSM/WCDMA dual-mode terminal sending data includes the following steps:

Step 201: After the application layer of the GSM/WCDMA dual-mode terminal generates the service data in the circuit domain and the data domain, submit it to the network layer of the circuit domain component and the data domain component for processing;

Step 202: the network layer of the circuit domain component and the data domain component respectively map the circuit domain service and the data domain service to different logical channels, and then submit them to the data link layer of the circuit domain component and the data domain component respectively;

Step 203: The data link layer of the circuit domain component and the data domain component respectively map the logical channels described in step 202 to different transmission channels, and frame them respectively, and then submit them to the physical layer of the circuit domain component and the data domain component respectively ;

Step 204: The physical layer of the circuit domain component and the data domain component maps the above-mentioned framed circuit domain service and data domain service to different physical channels, and sends them to the GSM by the radio frequency devices of the circuit domain component and the data domain component respectively network and WCDMA network.

In the receiving process, the GSM/WCDMA dual-mode terminal receives circuit domain service data and data domain service data from the GSM and WCDMA network respectively, and then submits them to the dual-mode mobile terminal after being processed by the circuit domain components and data domain components respectively. application layer. Wherein, the above receiving process is specifically an inverse process of the transmitting process described in steps 201-204 above.

In order to realize the above-mentioned interaction process of steps 101-105, the network side also needs to perform a simple upgrade to cooperate with the interaction process between the GSM/WCDMA dual-mode terminal and the mobile network described in the present invention.

At first, the HLR of this GSM/WCDMA dual-mode terminal user supports that this GSM/WCDMA dual-mode terminal user is attached to two Mobile Switching Centers (MSCs) and one SGSN; and the HLR should be able to route the call to the corresponding on MSC. The above functions can be accomplished simply by adding a field indicating the CS domain MSC to which the HLR is attached in the existing HLR configuration. At this time, there will be two fields in the HLR indicating the circuit domain MSC to which the HLR is attached, that is, an MSC in a GSM network and an MSC in a WCDMA network; and one field indicating the data domain SGSN to which the HLR is attached. Through above-mentioned configuration HLR just can correctly carry out route selection, for example, if the called service is common voice service, HLR will route this call to the MSC of the GSM network that the called user is attached; if it is CS 64k service, then Routed to the MSC of the WCDMA network; and if it is a data service, it is routed to the SGSN in a standard way.

In addition, WCDMA needs to support the joint location update of GSM/WCDMA dual-mode terminals, that is, it can automatically update its location area through the routing area update of GSM/WCDMA dual-mode terminals.

At the same time, in the broadcast message of the system, the priority of the GSM/GPRS cell is set to be lower than that of the WCDMA cell, so that the GSM/WCDMA dual-mode terminal preferentially chooses to reside in the WCDMA network.

The upgrade operation on the network side is easy to understand and easy to implement for those skilled in the art, so it will not be described in detail again.

As can be seen from the above method, the method of the present invention, by separating the transmission of the data domain service and the circuit domain service, enables the GSM/WCDMA dual-mode terminal described in the present invention to work on the GSM network and the WCDMA network at the same time, realizing Under the condition that the current WCDMA network coverage and operation services are not perfect, on the one hand, the quality of user voice services can be guaranteed without large-scale upgrades to the existing network; Domain business and high-speed data business.

It should be noted that those skilled in the art can understand that the method described in the present invention can also be applied to access technologies of other wireless communication systems, such as CDMA2000, TD_SCDMA systems, etc., not limited to GSM, WCDMA and GPRS systems.

The preferred embodiments above are cited to further describe the purpose, technical solutions and advantages of the present invention in detail. It should be understood that the above descriptions are only preferred embodiments of the present invention, and are not intended to show the present invention. Within the spirit and principles of the present invention, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention.

Claims (9)

1. A method for interacting between a dual-mode mobile terminal and a mobile network, characterized in that the circuit domain function and data domain function of the dual-mode mobile terminal are respectively composed of a circuit domain component for processing voice services and a circuit domain component for processing data services and a unique circuit domain function. Realization of business data domain components; The method performs the following steps when the dual-mode mobile terminal is in a power-on state: a. The circuit domain component of the dual-mode mobile terminal searches and measures the network signal of the first mobile communication system, and the data domain component searches and measures the network signal of the second mobile communication system; b. The dual-mode mobile terminal judges the current mobile communication network with good signal coverage according to the measurement results. If the first mobile communication system network signal coverage is poor, and the second mobile communication system network signal coverage is good, then perform step c; if the first mobile communication system network signal coverage is good, and the network signal coverage of the second mobile communication system are both good, then perform step d; if the network signal coverage of the first mobile communication system is good, but the network signal coverage of the second mobile communication system is poor, then perform step e; c. The dual-mode mobile terminal sends or receives specific circuit domain services and data domain services through the second mobile communication system network, and then returns to step a; d. The dual-mode mobile terminal sends or receives voice services through the first mobile communication system network, and sends or receives data domain services and specific circuit domain services through the second mobile communication system network, and then returns to step a; e. The dual-mode mobile terminal sends or receives voice services and data services through the first mobile communication system network, and then returns to step a. 2. The method according to claim 1, wherein the first mobile communication system is a GSM mobile communication system; the second mobile communication system is a WCDMA mobile communication system. 3. The method according to claim 2, wherein the data domain part of the dual-mode mobile terminal includes a GPRS function module, and the WCDMA voice service function is turned off; Said step e is: the dual-mode mobile terminal sends or receives the data domain service via the GSM network through the GPRS function module in the data domain component, and sends or receives the voice service via the GSM network. 4. The method according to claim 1, 2 or 3, characterized in that in step d, the dual-mode mobile terminal sends the circuit domain service through the GSM network, and the method for sending the data domain service through the WCDMA network comprises the following steps: After d1, the business data of the circuit domain and the data domain generated by the application layer of the dual-mode mobile terminal are submitted to the network layer of the circuit domain component and the data domain component for processing; d2. The network layer of the circuit domain component and the data domain component respectively maps the circuit domain service and the data domain service to different logical channels, and then submits them to the data link layer of the circuit domain component and the data domain component respectively; d3. The data link layer of the circuit domain component and the data domain component respectively maps the logical channels described in step d2 to different transmission channels, and frames them respectively, and then submits them to the physical layers of the circuit domain component and the data domain component respectively; d4, the physical layer of the circuit domain component and the data domain component, map the circuit domain service and data domain service after the framing described in step d3 to different physical channels, and send them by the radio frequency devices of the circuit domain component and the data domain component respectively to GSM network and WCDMA network. 5. The method according to claim 1, 2 or 3, wherein the dual-mode mobile terminal in step d receives the circuit domain service through the GSM network, and the method for receiving the data domain service through the WCDMA network is specifically: The circuit domain part and the data domain part of the dual-mode mobile terminal respectively receive the circuit domain service and the data domain service from the GSM network and the WCDMA network, perform corresponding reception processing, and then submit to the application layer of the dual-mode mobile terminal. 6. The method according to claim 1, 2 or 3, characterized in that the method further comprises: setting the home location register of the dual-mode mobile terminal to support the dual-mode mobile terminal to simultaneously attach to the mobile network of the GSM network Switching center, mobile switching center of WCDMA network, and WCDMA or GPRS network service support node; When the dual-mode mobile terminal is called, the home location register of the dual-mode mobile terminal routes the ordinary call voice service call to the corresponding mobile exchange of the GSM network attached to the dual-mode mobile terminal according to the call service type. On the center; route the special circuit domain service call to the corresponding mobile switching center of the WCDMA network attached to the dual-mode mobile terminal; route the data domain service call to the WCDMA or GPRS network service attached to the dual-mode mobile terminal support node. 7. The method according to claim 1, 2 or 3, wherein the specific circuit domain service is specifically a videophone service of the third generation mobile communication system. 8. The method according to claim 1, 2 or 3, characterized in that the method further comprises: setting the priority of the GSM/GPRS cell to be lower than that of the WCDMA cell, and the WCDMA system supports joint location update; and WCDMA cells are preferred for location update. 9. The method according to claim 1, 2 or 3, further comprising: the circuit domain part and the data domain part of the dual-mode mobile terminal share the same International Mobile Subscriber Identity.

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