WO2012051805A1 - Method and device for dual-network terminal communications - Google Patents

Abstract

The present invention discloses a device for dual-network terminal communications, wherein said dual-network terminal is a dual-network dual-standby terminal. Said device includes an application sub-system and a wireless communication sub-system. Said application sub-system is configured: to select a network according to the service type when the user of said dual-network dual-standby terminal initiates a service; to select the 3G network when the initiated service is a Packet Switched (PS) service or the visual telephone service of Circuit Switched (CS) services; and to select the 2G network when the initiated service is a CS service except the visual telephone service. Said wireless communication sub-system is configured: to monitor network signals, and to perform communications via the selected network when the 3G or 2G network selected by said application sub-system satisfies the condition for signal strength. The present invention also discloses a method for dual-network terminal communications. The present invention radically reduces and avoids the frequent network reselection caused by the policy of "dual-mode switch between 2G and 3G" at the 2G/3G dual-mode single-standby terminal.

Description

 Method and device for dual network terminal communication

TECHNICAL FIELD The present invention relates to the field of mobile communications, and in particular, to a method and apparatus for dual-network terminal communication.

Background technique

 With the gradual development of the third-generation mobile communication (The 3rd Generation, 3G) network in China, the three major mobile communication operators have officially entered the 3G era. However, due to the coverage level of 3G networks in the initial stage of the current 3G network construction and the next development period, the 2G network has been optimized and perfected for more than ten years, regardless of the breadth of coverage (2G network covers almost China) All the natural villages) or the depth of coverage (such as indoors, basements and subways) have large gaps, so the major operators also have long-term coexistence of 2G and 3G dual networks as their operational goals and strategies. China Mobile has proposed the "three-non-principle of not changing cards, not changing numbers, and not requiring registration" and the time division of Synchronization Code Division Multiple Access (TD-SCDMA)/Global Mobile Communications. Global System for Mobile Communications (GSM) dual-mode single-standby custom mobile terminal to promote and operate its own TD-SCDMA 3G network. However, this strategy of "coexistence of 2G and 3G networks" and "TD-SCDMA/GSM dual-mode single-standby terminal customization" has encountered difficulties in real operations. On the one hand, due to the existing "2G and 3G dual-mode switching" strategy, mobile terminal reselection is frequent, power consumption is serious, call drop, Internet disconnection, and even off-network abnormalities occur, and the user experience is poor. On the other hand, because the existing 3G network coverage quality is far less than the GSM network, the user's confidence in the TD-SCDMA network is insufficient. The problem of the network has led to the dilemma of the terminal, and the dilemma of the terminal in turn magnifies the problem of the network.

SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art described above, and to provide a method and apparatus for dual-network terminal communication to reduce and avoid 2G/3G dual-mode single-standby terminals because of "2G and 3G dual-mode switching. "The network causes frequent reselection, severe power consumption, dropped calls, and off-network. Failure, improve the user experience of the terminal. In order to solve the above problem, the present invention provides a dual-network terminal communication method, where the dual-network terminal is a dual-network dual-standby terminal, and the method includes: when a user of the dual-network dual-standby terminal initiates a service, The dual-network dual-standby terminal selects the network according to the service type. When the initiated service is a packet switched (PS) service, or is a videophone service in a circuit switched (CS) service, the dual-network dual standby terminal selects the third generation. a mobile communication (3G) network, when the initiated service is a CS service other than the videophone service, the dual-network dual-standby terminal selects a second-generation mobile communication (2G) network; and when the selected network satisfies the signal strength In the condition, the dual-network dual standby terminal communicates through the selected 3G or 2G network. When the initiated service is a PS service, and the dual-network dual-standby terminal selects a 3G network, the method further includes: when the dual-network dual-standby terminal detects the signal strength according to the current 3G network, the PS service cannot be initiated. The dual-network dual standby terminal activates the 2G data link of the 2G network to initiate the service. When the initiated service is a PS service, and the dual-network dual-standby terminal selects a 3G network, the method further includes: when the dual-network dual-standby terminal detects that the signal strength of the current 3G network is weakened to be unable to carry the PS service. The PDP data link corresponding to the PS service is switched to the 2G data link of the 2G network. The method further includes: when the dual-network dual-standby terminal uses the 2G data link to perform the PS service, when the signal strength of the 3G network is enhanced to be able to carry the PS service, the dual-network dual-standby terminal The Packet Data Protocol (PDP) data link corresponding to the PS service is switched to the 3G data link. The 3G network is a time division synchronous code division multiple access (TD-SCDMA) network, a wideband code division multiple access (WCDMA) network or a CDMA2000 network, and the 2G network is a global mobile communication system (GSM) network or a code division. Address (CDMA) network. The dual-network dual-standby terminal includes an application subsystem and a wireless communication subsystem; the application subsystem selects a network according to a service type, and the wireless communication subsystem monitors a network signal, when the selected network satisfies a signal strength condition The wireless communication subsystem communicates through the selected network. The wireless communication subsystem includes a 3G wireless communication subsystem and a 2G wireless communication subsystem. When the initiated service is a PS service, and the application subsystem selects a 3G network, the method further includes: the application subsystem According to the signal strength of the current 3G network monitored by the 3G wireless communication subsystem, when it is determined that the PS service cannot be initiated, the 2G wireless communication subsystem is notified to activate the 2G data link of the 2G network, and the service is initiated. The wireless communication subsystem includes a 3G wireless communication subsystem and a 2G wireless communication subsystem. When the initiated service is a PS service, and the 3G wireless communication subsystem communicates through the 3G network, the method further includes When the application subsystem determines that the signal strength of the current 3G network is weak enough to be unable to carry the PS service according to the signal strength of the current 3G network monitored by the 3G wireless communication subsystem, the application subsystem notifies the The 3G wireless communication subsystem and the 2G wireless communication subsystem switch the PDP data link corresponding to the PS service from the 3G data link to the 2G data link. The method further includes: when the 2G wireless communication subsystem uses the 2G data link to perform the PS service, when the application subsystem determines the current 3G according to the signal strength of the current 3G network monitored by the 3G wireless communication subsystem When the signal strength of the network is enhanced to carry the PS service, the application subsystem notifies the 3G wireless communication subsystem and the 2G wireless communication subsystem to connect the PDP data link corresponding to the PS service from the 2G data link. The road switches to the 3G data link. The 3G wireless communication subsystem includes a 3G modem module and a first identity recognition module, and the 2G wireless communication subsystem includes a 2G modem module and a second identity recognition module. The inserted first identity card is the same as the mobile subscriber number (MSISDN) of the second identity card inserted in the second identity module, and the International Mobile Subscriber Identity (IMSI) is different, and the 3G modem module uses The IMSI of the first identity card Registering with the 3G network, and communicating with the 3G network by reading the information in the first identification card in the first identity module, the 2G modem module is registered in the 2G network using the IMSI of the second identity card And communicating with the 2G network by reading the information in the second identification card in the second identity module. In order to solve the above problem, the present invention further provides a device for dual-network terminal communication, where the dual-network terminal is a dual-network dual-standby terminal, the device includes an application subsystem and a wireless communication subsystem; When the user of the dual-network dual standby terminal initiates a service, the network is selected according to the service type, and when the initiated service is a packet switched (PS) service, or is a videophone service in a circuit switched (CS) service, a third generation mobile communication (3G) network, when the initiated service is a second generation mobile communication (CS) service other than the videophone service, selecting a 2G network; and the wireless communication subsystem is configured to: monitor the network signal When the 3G or 2G network selected by the application subsystem satisfies the condition of the signal strength, the communication is performed through the selected network. The wireless communication subsystem includes a 3G wireless communication subsystem and a 2G wireless communication subsystem; the 3G wireless communication subsystem is configured to: notify a signal strength of the 3G network to the application subsystem, and, according to the application The notification of the subsystem communicates with the 3G network; the 2G wireless communication subsystem is configured to: communicate with the 2G network according to the notification of the application subsystem. The application subsystem is further configured to: when the initiated service is a PS service, according to the signal strength of the current 3G network monitored by the 3G wireless communication subsystem, when it is determined that the PS service cannot be initiated, notify the The 2G wireless communication subsystem activates the 2G data link of the 2G network to initiate the PS service. The application subsystem is further configured to: when the initiated service is a PS service, in the process of communicating through the 3G network, if the signal strength of the current 3G network monitored by the 3G wireless communication subsystem is determined, the current 3G network is determined. When the signal strength is weakened to be unable to carry the PS service, the 3G wireless communication subsystem and the 2G wireless communication subsystem are notified to switch the packet data protocol (PDP) data link corresponding to the PS service from the 3G data link. To the 2G data link. The application subsystem is further configured to: when the 2G wireless communication subsystem uses the 2G data link to perform the PS service, when the signal strength of the current 3G network monitored by the 3G wireless communication subsystem is determined, the current When the signal strength of the 3G network is enhanced to carry the PS service, the 3G wireless communication subsystem and the 2G wireless communication subsystem are notified to transmit a packet data protocol (PDP) data link corresponding to the PS service from the 2G data link. The road switches to the 3G data link. The 3G wireless communication subsystem includes a 3G modem module and a first identity recognition module, and the 2G wireless communication subsystem includes a 2G modem module and a second identity recognition module. The inserted first identity card is the same as the mobile subscriber number (MSISDN) of the second identity card inserted in the second identity module, and the International Mobile Subscriber Identity (IMSI) is different; the 3G modem module setting And: registering with the 3G network by using the IMSI of the first identity card, and communicating with the 3G network by reading information in the first identity card in the first identity module; the 2G modem module is configured to : registering with the 2G network using the IMSI of the second identity card and communicating with the 2G network by reading the information in the second identity card in the second identity module. The 3G network is a time division synchronous code division multiple access (TD-SCDMA) network, a wideband code division multiple access (WCDMA) network or a CDMA2000 network, and the 2G network is a global mobile communication system (GSM) network or a code division. Address (CDMA) network. Compared with the existing 2G/3G dual-mode single-standby terminal technology, the method and the device of the present invention take into account the 2G network circuit switching (CS) domain service expertise and the data service expertise of the 3G network. At the same time, the dual-mode dual-standby technology reduces the probability of dual-mode switching (only partial switching in data services), which fundamentally reduces and avoids 2G/3G dual-mode single-standby terminals because of "2G and 3G dual-mode switching. "The network caused frequent reselection, severe power consumption, dropped calls, off-network and other failures. It has improved the user experience of the terminal and promoted the development of 3G networks.

1 is a schematic diagram of an apparatus for communicating between dual-network dual standby terminals according to an embodiment of the present invention; 2 is a schematic diagram of an apparatus for communicating by a dual-network dual standby terminal according to an application example of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION The basic idea of the present invention is that the 3G network has a large bandwidth and is suitable for data services, and the 2G network optimization work is accumulated more, and the 2G service such as voice is better supported, and the 2G is used at the terminal side. The service switching of the Packet Switching (PS) service and the Circuit Switching (CS) service is implemented in the 3G dual-network dual-standby (that is, the 2G network carries the CS service, and the 3G network carries the PS data service). Specifically, when the user of the dual-network dual-standby terminal initiates a service, the dual-network dual-standby terminal selects a network according to the service type, and when the initiated service is a PS service, or is a videophone service in the CS service, The dual-network dual-standby terminal selects a 3G network, and when the initiated service is a CS service other than the videophone service, the dual-network dual-standby terminal selects the 2G network; when the selected network satisfies the condition of the signal strength, the The dual-network dual standby terminal communicates through the selected network. Among them, although the videophone service is used in the CS domain, since the service bearer must be carried through the 3G network, when the user initiates the videophone service, the 3G network needs to be selected. The above condition for satisfying the signal strength means that the signal strength of the network can carry related services (i.e., services initiated). In a specific implementation, when the signal strength of the network is greater than a specified threshold, the condition for satisfying the signal strength may be determined. In addition, in the present invention, the initiated PS service can also be adjusted in the following manner, including:

When the dual-network dual-standby terminal detects that the PS service cannot be initiated according to the signal strength of the current 3G network, the dual-network dual-standby terminal activates the 2G data link of the 2G network to initiate the service.

2. In the process of the dual-network dual-standby terminal communicating through the 3G network, when the dual-network dual-standby terminal detects that the signal strength of the current 3G network is weak enough to be unable to carry the PS service, the PS service is corresponding. Packet Data Protocol (PDP) data link is switched to On the 2G data link of the 2G network.

3. When the dual-network dual-standby terminal uses the 2G data link to perform the PS service, when the signal strength of the 3G network is enhanced to be able to carry the PS service, the dual-network dual-standby terminal will use the PS service. The corresponding PDP data link is switched to the 3G data link. The specific implementation may be that the dual-network dual-standby terminal determines the signal strength of the current 3G network. If the threshold is less than or equal to the specified threshold, it is determined that the PS service cannot be initiated or the PS service is carried. If the threshold is greater than the specified threshold, It is determined that the PS service can be carried. Of course, the specified thresholds used in the above three cases may be equal or unequal. In addition, the initiated service is a videophone service, but the dual-network dual standby terminal determines that the videophone service cannot be initiated according to the monitored signal strength of the current 3G network, and then the videophone is used. The service falls back to the normal voice service, and then the 2G wireless communication module is notified to initiate the voice service. The above 3G network may be a TD-SCDMA network, a Wideband Code Division Multiple Access (WCDMA) network, or a CDMA2000 network, and the 2G network may be a GSM network or a Code Division Multiple Access (CDMA) network. In the embodiments and application examples of the present invention, the 3G network is mainly used as the TD-SCDMA network, and the 2G network is described as the GSM network, but is not limited thereto, and other types of 3G networks and 2G networks are also applicable to the present invention. .

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other. As shown in FIG. 1, the apparatus of the embodiment of the present invention includes an application subsystem and a wireless communication subsystem, where

The application subsystem is configured to: when the user of the dual-network dual-standby terminal initiates a service, select a network according to the service type, and select 3G when the initiated service is a PS service or a videophone service in the CS service. Network, when the initiated service is a CS service other than the videophone service, the 2G network is selected; The wireless communication subsystem is configured to: monitor a network signal, and communicate through the selected network when the network selected by the application subsystem satisfies the condition of the signal strength. The wireless communication subsystem includes a 3G wireless communication subsystem and a 2G wireless communication subsystem; the 3G wireless communication subsystem is configured to: notify a signal strength of the 3G network to the application subsystem, and, according to the application The notification of the subsystem communicates with the 3G network; the 2G wireless communication subsystem is configured to: communicate with the 2G network according to the notification of the application subsystem. In addition, as described above, the application subsystem is further configured to: when the initiated service is a PS service, according to the signal strength of the current 3G network monitored by the 3G wireless communication subsystem, determine that the PS service cannot be initiated. Informing the 2G wireless communication subsystem to activate the 2G data link of the 2G network to initiate the PS service; and, when the initiated service is a PS service, in the process of communicating through the 3G network, according to the 3G wireless Notifying the signal strength of the current 3G network monitored by the communication subsystem, and determining that the signal strength of the current 3G network is weakened to be unable to carry the PS service, notifying the 3G wireless communication subsystem and the 2G wireless communication subsystem to perform the PS service Corresponding PDP data link is switched from the 3G data link to the 2G data link; and when the 2G wireless communication subsystem uses the 2G data link for PS service, when monitored according to the 3G wireless communication subsystem The signal strength of the current 3G network is determined, and when the signal strength of the current 3G network is enhanced to carry the PS service, the 3G wireless communication subsystem and the 2G wireless are notified. The communication subsystem switches the PDP data link corresponding to the PS service from the 2G data link to the 3G data link. As shown in FIG. 1, the 3G wireless communication subsystem includes a 3G modem module (Modem) and a first identity recognition module (User Identity Model (UIM)), and the 2G wireless communication subsystem includes 2G. a modem module and a second identity module (Subscriber Identity Module (SIM)); a first identity card (UIM card) inserted in the first identity module and the second identity The mobile subscriber number (Mobile Subscriber International ISDN/PSTN number, MSI SDN) of the second identity card (SIM card) inserted in the module is the same, and the International Mobile Subscriber Identification Number (IMSI) is different; The 3G modem module is configured to: register with the 3G network using the IMSI of the first identity card, and communicate with the 3G network by reading information in the first identity card in the first identity module; The 2G modem module is configured to: register with the 2G network using the IMSI of the second identity card, and communicate with the 2G network by reading information in the second identity card in the second identity module.

In the above embodiment, the TD-SCDMA/GSM dual-network dual-standby mobile phone with the "application (AP) + Communication Platform (CP)" triple-core architecture is used to implement the 2G and 3G network bearer offload of the CS and PS services. The AP part is the main module responsible for the application; the CP part is the module responsible for communication, including the single mode 3G Modem and the 2G Modem two communication modules. In order to implement the dual card number, the card slot of the first identity module (based on the TD-SCDMA mode) and the card slot of the second identity module (based on the GSM mode), two cards of the IMSI different from the MSISDN will be used. When the terminal registers with the network, it will register the corresponding 2G and 3G networks with different IMSI numbers. In another embodiment, the wireless communication subsystem may also include only one identity module, wherein one card is used for both the 2G network and the 3G network (ie, when the terminal registers with the network, the same one will be used respectively). IMSI number registered 2G and 3G networks). In the above embodiment, the application processor module with an independent CPU in the application subsystem, in the wireless communication subsystem, the 3G wireless communication subsystem consists of a 3G Modem module with an independent CPU and a corresponding first identity recognition module (UIM card module) The 2G wireless communication subsystem consists of a 2G Modem module with a separate CPU and a corresponding first identity module (SIM card module). In other implementations, the application subsystem may also have no independent CPU, but with 3G. The Modem module shares a CPU, or shares a CPU with the 2G Modem module. Even, the application subsystem, the 3G wireless communication subsystem, and the 2G wireless communication subsystem share a CPU, application subsystem and wireless communication subsystem implementation and implementation. The example is similar and will not be described again. The following is a description of a 3G network as a TD-SCDMA network, and a 2G network as an application example of a GSM network. As shown in Figure 2, the hardware module portion of this application example can be viewed as consisting of three separate systems: an application subsystem, a TD-SCDMA wireless communication subsystem, and a GSM wireless communication subsystem, each of which is architected independently. On the processor. The application subsystem is the main control system of the mobile terminal, and is responsible for completing the interaction with the user. If the user needs to perform wireless communication or SIM card operation, the subsystem is responsible for controlling the corresponding wireless communication system to complete related functions. In this example, the subsystem is also responsible for distinguishing the user-initiated services according to the "CS service GSM network, PS service TD-SCDMA network" logic, and adjusting the bearer network according to the TD-SCDMA network condition during data service. .

The TD-SCDMA wireless communication subsystem is responsible for the operation of the TD-SCDMA network for wireless communication or UIM card. In this example, the subsystem is also responsible for monitoring and reporting the relevant parameters of the strength of the TD-SCDMA network in which the terminal is located. The subsystem consists of a TD-SCDMA Modem module with a separate CPU and a corresponding UIM card module. The TD-SCDMA Modem module of this example is different from the TD-SCDMA Modem currently in commercial use. It does not have the TD-SCDMA/GSM dual-mode switching function, and only the 'TD-SCDMA ONLY' mode. It is primarily responsible for data transactions based on TD-SCDMA networks and data interactions for video telephony services. The signal strength of the TD-SCDMA network where the terminal is located is monitored. When the signal changes, the application subsystem is notified in time by the AT command. Through the UIM card module, the TD-SCDMA Modem module can interact with the data in the TD-SCDMA mode card slot with the GSM mode and the MSISDN IMSI card. The user identification information and the authentication information on the reading card are exchanged with the TD-SCDMA network side; the service data on the card is updated and managed through the wireless air interface method; the telephone number, short message, etc. stored in the card are included. User personal information is managed.

Operation. Similar to the TD-SCDMA wireless communication subsystem, it is also composed of a GSM Modem module with a separate CPU and a corresponding SIM card module.

The GSM Modem module is mainly responsible for the bearer of all CS circuit domain services except the videophone of the entire terminal, and temporarily carries related data services through the 2G data link when the TD-SCDMA signal is not good.

Through the SIM card module, the GSM Modem module can be used with the one in the GSM mode card slot. The TD mode interacts with data in the SIM card of the MSISDN different IMSI. The user identification information and the authentication information on the reading card are exchanged with the TD-SCDMA network side; the service data on the card is updated and managed through the wireless air interface method; the telephone number, short message, etc. stored in the card are included. User personal information is managed.

After the mobile terminal of the dual-network dual-standby dual-card is powered on, it will actively report two different IMSI numbers of the SIM or UIM card with the MSISDN number to the corresponding TD-SCDMA network and the GSM network. Taking the user's telephone service as an example, when the user calls out the voice call through the dialing interface, the application subsystem invokes the GSM wireless communication subsystem and the GSM network according to the logic of "CS service goes GSM network, PS service goes TD-SCDMA network". Interact and carry traffic with the other party through the GSM network. When called, the network device establishes a link and carries the service according to the information registered by the terminal on the network side (mainly the IMSI number used by the terminal to register the GSM network) and the GSM wireless communication subsystem of the terminal. The same is true for other CS business processes such as SMS. In particular, the TD-SCDMA videophone service, which is also based on the CS circuit domain, requires a TD-SCDMA network for bearer. When the user initiates a call, the application subsystem will invoke the TD-SCDMA wireless communication subsystem and the TD-SCDMA network. Perform interaction and data hosting. When called, the network device establishes a link and carries the service according to the information registered by the terminal on the network side (mainly the IMSI number used by the terminal to register the TD-SCDMA network) and the TD-SCDMA wireless communication subsystem of the terminal.

When the user accesses the Internet through the browser, when the user inputs the relevant web address in the browser, the application subsystem first queries the signal strength of the TD-SCDMA network where the current terminal is located through the TD-SCDMA wireless communication subsystem. When the application subsystem knows that the network signal meets the requirements, the TD-SCDMA wireless communication subsystem and the corresponding network service device establish a data link channel based on the TD-SCDMA network and perform related service data interaction. When the application subsystem knows that the network signal does not meet the requirements, the application subsystem will actively establish a data link channel based on the GSM network through the GSM wireless communication subsystem and the corresponding network service device to replace the TD-SCDMA network to complete the Internet service. . Of course, when the terminal uses the default TD-SCDMA wireless communication subsystem and the TD-SCDMA network to access the Internet, when the network signal decays to meet the service requirements, the terminal application subsystem will actively disconnect the TD based on the TD-SCDMA wireless communication subsystem. - PDP data link of the SCDMA network, and immediately call the GSM wireless communication subsystem to make the terminal Establish a data link with the GSM network to maintain the Internet service. Conversely, when the terminal temporarily uses the GSM wireless communication subsystem and the GSM network to access the Internet, the application subsystem learns that the TD-SCDMA network signal is restored to meet the data service requirements through the TD-SCDMA wireless communication subsystem, and the relevant PDP data link is The road switches back to the TD-SCDMA data link. Other forms of data services are basically similar to the process of surfing the Internet through a browser. However, the MMS service and the Push Push mail service are complicated by the special PUSH notification message mechanism in the business process, and the interaction process when passively receiving the related MMS and PushMail mail. Since the PUSH notification message belongs to the CS circuit domain category, the network side first sends the relevant PUSH notification message to the terminal application subsystem through the GSM network and the GSM communication subsystem, and the terminal application subsystem performs according to the current network situation and according to the related PS service policy. Scheduling.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Optionally, all or part of the steps of the foregoing embodiments may also be implemented by using one or more integrated circuits. Accordingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, or may use software functions. The form of the module is implemented. The invention is not limited to any specific form of combination of hardware and software. The above description is only the preferred embodiment of the present invention, and is 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 The present invention combines the expertise of the 2G network circuit-switched CS domain service with the data service expertise of the 3G network, and reduces the probability of dual-mode handover through dual-network dual-standby technology (only partial switching in data services). The 2G/3G dual-mode single-standby terminal is fundamentally reduced and avoided because of the "2G and 3G dual-mode switching" strategy, which causes frequent network reselection, severe power consumption, dropped calls, and off-network. It has improved the user experience of the terminal and promoted the development of 3G networks.

Claims

Claim A dual-network terminal communication method, wherein the dual-network terminal is a dual-network dual-standby terminal, the method includes: when a user of the dual-network dual-standby terminal initiates a service, the dual network The dual standby terminal selects the network according to the service type. When the initiated service is a packet switched (PS) service or a videophone service in a circuit switched (CS) service, the dual network dual standby terminal selects the third generation mobile communication. (3G) network, when the initiated service is a CS service other than the videophone service, the dual-network dual-standby terminal selects a second-generation mobile communication (2G) network; and when the selected network satisfies the condition of the signal strength The dual-network dual standby terminal communicates through the selected 3G or 2G network. 2. The method according to claim 1, wherein, when the initiated service is a PS service, and the dual network dual standby terminal selects a 3G network, the method further includes:  When the dual-network dual standby terminal detects that the PS service cannot be initiated according to the signal strength of the current 3G network, the dual-network dual standby terminal activates the 2G data link of the 2G network to initiate the service. The method of claim 1, wherein, when the initiated service is a PS service, and the dual network dual standby terminal selects a 3G network, the method further includes: when the dual network dual standby terminal monitors the current When the signal strength of the 3G network is weakened to be unable to carry the PS service, the PDP data link corresponding to the PS service is switched to the 2G data link of the 2G network. The method according to claim 2 or 3, wherein the method further comprises: when the dual-network dual standby terminal uses the 2G data link to perform the PS service, when the 3G network is detected When the signal strength is enhanced to carry the PS service, the dual-network dual standby terminal switches the packet data protocol (PDP) data link corresponding to the PS service to the 3G data link. The method according to any one of claims 1 to 3, wherein the 3G network is a time division synchronous code division multiple access (TD-SCDMA) network, a wideband code division multiple access (WCDMA) network or a CDMA2000 network. The 2G network is a Global System for Mobile Communications (GSM) network or a Code Division Multiple Access (CDMA) network. 6. The method of claim 1, wherein  The dual-network dual-standby terminal includes an application subsystem and a wireless communication subsystem; the application subsystem selects a network according to a service type, and the wireless communication subsystem monitors a network signal, when the selected network satisfies a signal strength condition, The wireless communication subsystem communicates over the selected network. The method of claim 6, wherein the wireless communication subsystem comprises a 3G wireless communication subsystem and a 2G wireless communication subsystem. When the initiated service is a PS service, and the application subsystem selects a 3G network, The method further includes: when the application subsystem determines that the PS service cannot be initiated according to the signal strength of the current 3G network monitored by the 3G wireless communication subsystem, notifying the 2G wireless communication subsystem to activate the 2G network. The 2G data link initiates the service. 8. The method according to claim 6, wherein the wireless communication subsystem comprises a 3G wireless communication subsystem and a 2G wireless communication subsystem. When the initiated service is a PS service, the 3G wireless communication subsystem passes the 3G network. In the process of performing communication, the method further includes: when the application subsystem determines, according to the signal strength of the current 3G network monitored by the 3G wireless communication subsystem, that the signal strength of the current 3G network is weakened to be unable to carry the PS In the case of the service, the application subsystem notifies the 3G wireless communication subsystem and the 2G wireless communication subsystem to switch the PDP data link corresponding to the PS service from the 3G data link to the 2G data link. The method according to claim 7 or 8, wherein the method further comprises: when the 2G wireless communication subsystem uses a 2G data link to perform a PS service, when the application subsystem is configured according to the 3G wireless communication The signal strength of the current 3G network monitored by the subsystem determines that the signal strength of the current 3G network is enhanced to carry the PS service, and the application subsystem notifies the 3G wireless communication subsystem and the 2G wireless communication subsystem. The PDP data link corresponding to the PS service is switched from a 2G data link to a 3G data link. 10. The method of claim 6, wherein the 3G wireless communication subsystem comprises a 3G modem module and a first identity recognition module, the 2G wireless communication subsystem comprising a 2G modem module and a second identity An identification module; the first identification card inserted in the first identity recognition module is the same as the mobile subscriber number (MSISDN) of the second identity identification card inserted in the second identity recognition module, and the International Mobile Subscriber Identity (IMSI) Differently, the 3G modem module registers with the 3G network using the IMSI of the first identity card, and communicates with the 3G network by reading information in the first identity card in the first identity module. The 2G modem module registers with the 2G network using the IMSI of the second identity card, and communicates with the 2G network by reading the information in the second identity card in the second identity module. A device for dual-network terminal communication, wherein the dual-network terminal is a dual-network dual-standby terminal, the device includes an application subsystem and a wireless communication subsystem; and the application subsystem is set as: When the user of the dual-network dual-standby terminal initiates a service, the network is selected according to the service type. When the initiated service is a packet switched (PS) service, or a videophone service in a circuit switched (CS) service, the third generation is selected. a mobile communication (3G) network, when the initiated service is a second generation mobile communication (CS) service other than the videophone service, selecting a 2G network; and the wireless communication subsystem is configured to: monitor the network signal, When the 3G or 2G network selected by the application subsystem satisfies the condition of the signal strength, communication is performed through the selected network. 12. The apparatus according to claim 11, wherein The wireless communication subsystem includes a 3G wireless communication subsystem and a 2G wireless communication subsystem; the 3G wireless communication subsystem is configured to: notify a signal strength of the 3G network to the application subsystem, and, according to the application subsystem The notification, communicate with the 3G network; the 2G wireless communication subsystem is configured to: communicate with the 2G network according to the notification of the application subsystem. The device of claim 12, wherein the application subsystem is further configured to: determine, according to the signal strength of the current 3G network monitored by the 3G wireless communication subsystem, when the initiated service is a PS service When the PS service cannot be initiated, the 2G wireless communication subsystem is notified to activate the 2G data link of the 2G network, and the PS service is initiated. The device of claim 12, wherein the application subsystem is further configured to: when the initiated service is a PS service, in the process of communicating through the 3G network, if the monitoring is performed according to the 3G wireless communication subsystem When the signal strength of the current 3G network is determined, and the signal strength of the current 3G network is weakened to be unable to carry the PS service, the 3G wireless communication subsystem and the 2G wireless communication subsystem are notified to group the packet data corresponding to the PS service. The Protocol (PDP) data link is switched from a 3G data link to a 2G data link. The apparatus according to claim 13 or 14, wherein the application subsystem is further configured to: when the 2G wireless communication subsystem uses a 2G data link to perform PS services, according to the 3G wireless communication sub The signal strength of the current 3G network monitored by the system determines that the signal strength of the current 3G network is enhanced to carry the PS service, and then notifies the 3G wireless communication subsystem and the 2G wireless communication subsystem to correspond to the PS service. The Packet Data Protocol (PDP) data link is switched from a 2G data link to a 3G data link. 16. The apparatus of claim 12, wherein the 3G wireless communication subsystem comprises a 3G modem module and a first identity recognition module, the 2G wireless communication subsystem comprising a 2G modem module and a second identity Identification module; the first The first identification card inserted in the identity module is the same as the mobile subscriber number (MSISDN) of the second identity card inserted in the second identity module, and the International Mobile Subscriber Identity (IMSI) is different;  The 3G modem module is configured to: register with the 3G network using the IMSI of the first identity card, and communicate with the 3G network by reading information in the first identity card in the first identity module; The 2G modem module is configured to: register with the 2G network using the IMSI of the second identity card, and communicate with the 2G network by reading information in the second identity card in the second identity module. 17. The apparatus according to claim 11, wherein the 3G network is a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) network, a Wideband Code Division Multiple Access (WCDMA) network or a CDMA2000 network, and the 2G network is global. Mobile communication system (GSM) network or code division multiple access (CDMA) network.