WO2012122768A1

WO2012122768A1 - Method and device for communication of dual-network dual-standby terminal

Info

Publication number: WO2012122768A1
Application number: PCT/CN2011/077239
Authority: WO
Inventors: 韦益德; 刘杰杰; 杨起; 殷专
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-03-17
Filing date: 2011-07-18
Publication date: 2012-09-20
Also published as: CN102123468A

Abstract

Disclosed are a method and a device for communication of dual-network dual-standby terminal. The method comprises: when a subscriber of the dual-network dual-standby terminal initiates a circuit switched (CS) service, the dual-network dual-standby terminal selecting a 2G network for communication; when the subscriber of the dual-network dual-standby terminal initiates a packet switched (PS) service, the dual-network dual-standby terminal selecting a 3G network or the 2G network for communication. By applying the dual-network dual-standby technology taking advantage of both the CS circuit domain service specialty of the 2G network and the data service specialty of the 3G network, in the premise of not requiring network adjustment, the terminal implements dual-network dual-standby without frequent 2/3G switching, thereby avoiding the instability incurred by upgrading of the current network.

Description

Method and device for communicating by dual network dual standby terminal

Technical field

The present invention relates to the field of mobile communications, and in particular, to a method and apparatus for communicating between dual-network dual-standby terminals.

Background technique

With the advent of the data age, the functions of mobile phones are not limited to basic services such as text messaging, and more and more users are paying attention to and demand for the functions of various data services such as Internet access and streaming media. This trend has driven The development of the 3G era. At present, the construction of domestic 3G networks is gradually unfolding, and the three major mobile communication operators have 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, subways, basements, etc.) have large gaps, so the major operators also have long-term coexistence of 2, 3G dual-network as their operational goals and strategies. China Mobile's strategy is to "do not change cards, do not change numbers, do not need to register" three principles, Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, or TD) / Global System of Mobile communication (GSM) dual-mode single-standby custom mobile terminal to promote and operate its own TD-SCDMA 3G network.

However, the strategy of "2, 3G network coexistence" and "TD/GSM dual-mode single-standby terminal customization" has encountered difficulties in real-life operations. On the one hand, due to the existing "2, 3G dual-mode switching" strategy, mobile terminal re-selection is frequent, power consumption is high, call drop, online disconnection, and even off-network abnormal faults occur, and user perception is poor. On the other hand, because the existing 3G network coverage quality is still far less than the GSM network, the user's confidence in the TD network is insufficient. Network problems have led to terminal dilemmas, and terminal distress has in turn amplified network problems.

Due to the user's distrust of the state of the TD network and the TD terminal, the number of users using the TD terminal is limited, and the TD terminal industry chain has not been able to grow and develop. On the one hand, the GSM network is overloaded. Due to the increasing frequency of users using data services, a large number of GSM resources are occupied by data services. Even if the network is expanded, it can no longer meet the needs of the growing mobile terminal users. On the other hand, the network utilization rate of TD is very high. At a low level, TD mobile terminal users are limited, TD network resources are seriously wasted, and the development of TD networks is also severely constrained.

In summary, if the current 23G coexistence strategy of TD terminal mobile phones is solved, the development of TD networks and terminals will be greatly promoted, which will have a profound impact on the rapid development of the TD industry chain.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art mentioned above, and propose a method and apparatus for communication between dual-network dual-standby terminals to reduce and avoid 2/3G dual-mode single-standby terminals because of "2, 3G dual mode". Switching to the policy causes frequent network reselection, severe power consumption, dropped calls, off-network, etc., improving the user experience of the terminal. In order to solve the above problem, the present invention provides a dual network dual standby terminal for communication, including:

When the user of the dual network dual standby terminal initiates a circuit (CS) service, the dual network dual standby terminal selects to communicate through the 2G network;

When the user of the dual-network dual standby terminal initiates a packet (PS) service, the dual-network dual-standby terminal selects to communicate through the 3G network or the 2G network.

Preferably, the above method has the following characteristics:

When the user of the dual-network dual-standby terminal initiates the PS service, the dual-network dual-standby terminal selects the communication through the 3G network or the 2G network,

If the 3G network signal satisfies the condition of the signal strength, the dual-network dual-standby terminal selects to communicate through the 3G network; otherwise, the dual-network dual-standby terminal selects to communicate through the 2G network.

Preferably, the above method has the following characteristics:

When the initiated service is a PS service, and the dual-network dual standby terminal performs communication through the 3G network, the method further includes:

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 dual-network dual standby terminal reserves the packet data protocol corresponding to the PS service. (PDP) Context, establishing a 2G data link of the 2G network, and switching the PDP data link corresponding to the PS service to the 2G data link.

Preferably, the method has the following features: the dual-network dual-standby terminal includes an application module and a wireless communication module, the application module includes a wireless service management sub-module, and the wireless communication module includes a 3G wireless communication sub-module and 2G wireless communication. a sub-module and an identity sub-module, wherein the identity recognition sub-module has an identification card inserted therein, and the identity identification card stores information for identity authentication of the 2G network and the 3G network;

When the user of the dual-network dual standby terminal initiates the CS service, the wireless service management sub-module selects the 2G network and notifies the 2G wireless communication sub-module, and the 2G wireless communication sub-module uses the information in the identification card. , communicating via 2G network;

When the user of the dual-network dual-standby terminal initiates the PS service, if the 3G wireless communication sub-module monitors that the 3G network signal satisfies the condition of the signal strength, the wireless service management sub-module selects the 3G network, and notifies the 3G wireless communication sub-module. The 3G wireless communication sub-module uses the information in the identification card to communicate through the 3G network; otherwise, the wireless service management sub-module selects the 2G network, and notifies the 2G wireless communication sub-module, the 2G wireless communication The submodule communicates over the 2G network using the information in the identification card.

Preferably, the above method has the following characteristics:

When the wireless service management sub-module 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 sub-module, the wireless service management sub-module The module reserves the PDP context corresponding to the PS service, and notifies the 2G wireless communication sub-module to establish a 2G data link of the 2G network. After the 2G data link is established, the 3G wireless communication sub-module is notified to associate the PDP data link corresponding to the PS service. The road switches to the 2G data link.

Preferably, the above method has the following characteristics:

The 3G network is a Time Division Synchronous Code Division Multiple Access (TD) network, and the 2G network is a Global Mobile Telecommunications System (GSM) network.

In order to solve the above problems, the present invention provides a device for communicating by a dual network dual standby terminal, including an application module and a wireless communication module; The application module is configured to: when the user of the dual-network dual-standby terminal initiates the CS service, select to communicate through the 2G network, and notify the wireless communication module; when the user of the dual-network dual-standby terminal initiates the PS service, Select to communicate via 3G network or 2G network, and notify the wireless communication module;

The wireless communication module is configured to: communicate according to a network selected by the application module according to the notification of the application module.

Preferably, the foregoing apparatus has the following features: the application module includes a wireless service management submodule, and the wireless communication module includes a 3G wireless communication submodule, a 2G wireless communication submodule, and an identity recognition submodule;

The identity recognition sub-module is configured to: insert an identity identification card, where the identity identification card stores information for identity authentication of the 2G network and the 3G network;

The wireless service management sub-module is configured to: when the user of the dual-network dual-standby terminal initiates a CS service, the wireless service management sub-module selects a 2G network, and notifies the 2G wireless communication sub-module; When the user of the terminal initiates the PS service, if the 3G wireless communication sub-module monitors the condition that the 3G network signal satisfies the signal strength, the 3G network is selected, and the 3G wireless communication sub-module is notified; otherwise, the 2G network is selected, and the 2G wireless communication is notified. Submodule

The 3G wireless communication sub-module is configured to: monitor a 3G network signal, and, according to the notification of the wireless service management sub-module, use the information in the identification card to communicate through a 3G network;

The 2G wireless communication module is configured to: according to the notification of the wireless service management sub-module, use the information in the identity identification card to communicate through the 2G network.

Preferably, the above device has the following features:

The wireless service management sub-module is further configured to: when the initiated service is a PS service, and the 3G wireless communication sub-module communicates through the 3G network, when the current 3G network is detected according to the 3G wireless communication sub-module The signal strength is determined when the signal strength of the current 3G network is weakened to be unable to carry the PS service, and the PDP context corresponding to the PS service is reserved, and the 2G wireless communication sub-module is notified to establish a 2G data link of the 2G network, and the 2G data link After the establishment is completed, the 3G wireless communication sub-module is notified to switch the PDP data link corresponding to the PS service to the 2G. Data link.

Preferably, the above device has the following features:

The 3G network is a TD network, and the 2G network is a GSM network.

Compared with the existing 23G dual-mode single-standby terminal technology, the dual-network dual-standby technology that utilizes both the CS circuit domain service expertise of the 2G network and the data service expertise of the 3G network is used by the method and device according to the embodiment of the present invention. Under the premise of no network adjustment, the terminal implements dual-network dual standby of TD/GSM, which does not require frequent 23G handover, avoiding frequent reselection due to 23G handover and high power consumption in current TD mobile phones. , off-network and other issues. Since there is no need to modify the network system to avoid the unstable impact of the upgrade of the existing network, the solution can be quickly promoted, so that more and more users can feel the advantages of 3G and promote the healthy development of the TD industry chain. BRIEF abstract

1 is a network topology diagram of an embodiment of the present invention;

2 is a schematic diagram of an apparatus for communicating between dual-network dual standby terminals according to an embodiment of the present invention. Preferred embodiment of the 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.

The basic idea of the embodiment of the present invention is that the bandwidth of the 3G network is large and the data is abundant, which is suitable for the data service (PS service, that is, the packet service); while the traditional 2G network network work has accumulated more work, and the support for the voice and other 2G services is better. Good feature: CS (circuit) service selects 2G network on 2/3G dual-network dual-standby terminal, PS (packet) service prefers 3G network, second-select 2G network, realizes PS and CS service offload (ie 2G network bearer CS) Business, 3G network bears PS data service).

Specifically, when the user of the dual-network dual-standby terminal initiates the CS service, the dual-network dual-standby terminal selects to communicate through the 2G network; when the user of the dual-network dual-standby terminal initiates the PS service, the double The network dual standby terminal chooses to communicate through the 3G network or the 2G network.

The above condition for satisfying the signal strength means that the signal strength of the network can carry related services (ie, the initiated service). In specific implementation, when the signal strength of the network is greater than a specified threshold, Determine the conditions that satisfy the signal strength.

In the embodiment of the present invention, the initiated PS service may also be adjusted in the following manner, including:

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 dual-network dual-standby terminal reserves the PDP (Packet Data Protocol) corresponding to the PS service. Context, establishing a 2G data link of the 2G network, and switching the PDP data link corresponding to the PS service to the 2G data link.

The PDP context corresponding to the PS service is reserved, and the PDP context can be used after the handover to ensure that the PS service is not interrupted after the handover, and the user does not perceive the link handover process, which is beneficial to improving the user experience.

In addition, 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 can also The PDP data link corresponding to the PS service is switched to the 3G data link.

In a specific implementation, the dual-network dual-standby terminal may determine the signal strength of the current 3G network. If the threshold is less than or equal to the specified threshold, it may be determined that the PS service cannot be initiated or the PS service is carried. If the threshold is greater than or equal to the specified threshold, Then it is determined that the PS service can be carried. Of course, the specified thresholds used in the above cases may be equal or unequal.

The above 3G network may be a TD network, a WCDMA (Wideband Code Division Multiple Access) network, or a CDMA2000 network, and the 2G network may be a GSM network, a CDMA (Code Division Multiple Access) network, or the like. In the embodiments and application examples of the present invention, the 3G network is mainly used as the TD 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.

In addition, the present invention is applicable to a dual-network dual standby (U) SIM card terminal, and can also be applied to a dual network dual standby dual (U) SIM card terminal. The following takes a dual-network dual-standby single-card terminal as an example for description.

As shown in FIG. 1 , it is a network topology diagram of the embodiment of the present invention, wherein a dual-network dual-standby terminal is simultaneously registered to a GSM network and a TD network, and is connected to an MGW (Media Gateway) and an MSCS (Cluster Server) through a GSM network. ), and, through the TD network, connect to the SGSN (GPRS Service Support Node) and GGSN (Gateway GPRS Support Node). As shown in FIG. 2, the device for communicating by the dual-network dual-standby terminal in the embodiment of the present invention is applied to a dual-network dual-standby terminal, including a connected application module and a wireless communication module;

The application module is configured to: when the user of the dual-network dual-standby terminal initiates the CS service, select to communicate through the 2G network, and notify the wireless communication module; when the user of the dual-network dual-standby terminal initiates the PS service, Select to communicate via 3G network or 2G network, and notify the wireless communication module;

The wireless communication module is configured to perform communication by using a network selected by the application module according to the notification of the application module.

The application module includes a wireless service management sub-module, and the wireless communication module includes a 3G wireless communication sub-module, a 2G wireless communication sub-module, and an identity recognition sub-module (ie, a (U)SIM card management sub-module);

An identity identification card ((U)SIM card) is inserted in the identity recognition sub-module, and the identity identification card stores information for identity authentication of the 2G network and the 3G network;

The wireless service management sub-module may be configured to: when the user of the dual-network dual-standby terminal initiates a CS service, the wireless service management sub-module selects a 2G network, and notifies the 2G wireless communication sub-module; When the user of the terminal initiates the PS service, if the 3G wireless communication sub-module monitors the condition that the 3G network signal satisfies the signal strength, the 3G network is selected, and the 3G wireless communication sub-module is notified; otherwise, the 2G network is selected, and the 2G wireless communication is notified. Submodule

The 3G wireless communication sub-module can be configured to: monitor a 3G network signal, and, according to the notification of the wireless service management sub-module, use the information in the identity identification card to communicate through a 3G network;

The 2G wireless communication module can be configured to use the information in the identification card to communicate through the 2G network according to the notification of the wireless service management sub-module.

In addition, the wireless service management sub-module may be further configured to: when the initiated service is a PS service, and the 3G wireless communication sub-module communicates through the 3G network, according to the 3G wireless communication sub-module The signal strength of the current 3G network is monitored, and when the signal strength of the current 3G network is weakened to be unable to carry the PS service, the PDP context corresponding to the PS service is reserved, and the 2G wireless communication sub-module is notified to establish a 2G data link of the 2G network. After the 2G data link is established, the 3G wireless communication sub-module is notified to cut the PDP data link corresponding to the PS service. Switch to the 2G data link.

The above 3G wireless communication sub-module is fixed in the TD mode and only resides in the PS domain. If the TD network is normal, it is responsible for the PS service of the terminal. Otherwise, the PS service is completed by the 2G wireless communication sub-module; the 2G communication subsystem is fixed in the GSM mode. The CS domain and the PS domain are normally residing, and are mainly responsible for the services of the CS domain. In the absence of the TD network, the bearer of the PS domain service is also assumed, that is, the CS domain and the PS domain dual network are simultaneously registered; Fixed selection of 2G network, PS domain service preferentially selects 3G network, PS domain service can be switched to 2G network when there is no signal in 3G network"" fixed network selection strategy to realize CS, PS service 2G, 3G mobile network service ^^ purpose.

The following is a detailed description of each module in the above device:

A, application (AP) module

This module is the same as the function of the AP module in the traditional "AP+CP" architecture terminal. It is the main control module of the mobile terminal. In this solution, it is mainly responsible for completing the interaction with the user, handling the local business and communication services that are not related to the network. The local logic part, such as dialer, SMS display, web content display, communication interaction logic interface display, etc.

There is a very important sub-function module in the application module, namely the wireless service management sub-module, which is responsible for the unified management of the two wireless communication sub-modules, including the CS service, the PS service shunt, and the PS service link switch. Since the 2G and 3G wireless communication modules are in a fixed network selection mode, and the 2G wireless communication sub-module is designated to be responsible for all CS domain services, such as voice calls, short messages, and phonebooks, when the application layer initiates the CS service, the wireless service is used. The management sub-module will initiate such a business process from the 2G wireless communication sub-module. The 3G wireless communication sub-module is fixed in the TD mode and only resides in the PS domain. Under the premise of the normal TD network, it is responsible for the bearer of the PS service. All PS services such as Internet access and streaming media are fixed from the 3G wireless communication sub-module. In the absence of TD network signal or poor quality of TD signal, in order to ensure the stability of the service, the PS service will be initiated by the 2G wireless communication sub-module. If the PS service already exists, the wireless management sub-module needs to save the environment of the PDP context, and initiate the PS dialing process of the 2G wireless communication sub-module from the background. After the PDP is activated, the link of the 3G wireless communication sub-module is switched to the 2G wireless communication. In the module, this can ensure the continuity of the business and will not cause bad influence to the user.

What needs special explanation is the MMS service. When the MMS is sent, if the current TD network status is normal, it will be sent directly from the 3G wireless communication sub-module. If there is no TD network signal or the TD signal quality is not good, the MMS is from the 2G wireless communication sub- The module sends. For the receiving process of MMS, the network First, the terminal is notified by the PUSH (Push) message to receive the MMS. Therefore, the 2G wireless communication sub-module first receives the PUSH message, and after receiving the PUSH message, if the TD network exists, the 3G wireless communication is received. The sub-module receives the MMS, otherwise it still receives the MMS from the 2G wireless communication sub-module. Since the two wireless communication sub-modules share a single (U)SIM, the authentication problem does not occur.

B, wireless communication module

The wireless communication module is the core part of the fixed network selection strategy of the terminal solution. It provides network access and data interaction functions for the mobile communication service and network application on the application side, and provides the load capacity for the service.

The module is logically divided into the following three sub-modules:

1. The 2G wireless communication sub-module, like the ordinary 2G single-mode wireless communication module, normally resides in the CS domain and PS domain of the GSM network after booting. Its functions include:

Responsible for the bearer of all CS circuit domain services of the entire terminal, including voice calls and short messages. When the 3G network signal is not good, the 2G network PS domain data link is provided to carry related data services.

2, 3G wireless communication sub-module, this module is different from the current 3G wireless communication module, only works in TD mode, and only resides in the PS domain, that is, it can only complete the PS service bearer, and does not have the CS service function. The protocol stack of the wireless communication module is adjusted. The advantage of this is that it will not cause adverse effects caused by 2/3G switching, such as power consumption abnormality and off-network.

3. (U) SIM card management sub-module, which is responsible for providing access to (U)SIM card for two wireless communication sub-modules, which is responsible for reading authentication information and phone book from the card during boot initialization, short Message and other functions. In order to realize the "three-in-one principle" proposed by China Mobile, it is necessary to support both 2G SIM cards and 3G (U) SIM cards. This technology is very mature, here No longer.

When the 2G wireless communication sub-module is powered on, it also resides in the CS domain and PS of the GSM network. All CS domain services of the terminal are initiated from the 2G wireless communication sub-module. Although the communication sub-module also resides in the PS domain, the service is not prioritized. In order to avoid the TD network, it can quickly switch to the 2G wireless communication sub-module to initiate the service. If there is no TD network or the TD network is of poor quality, the PS service is carried.

When the 3G wireless communication sub-module is powered on, it only resides in the PS domain of the TD network. Under the premise of normal TD network, it is responsible for the bearer of all PS services, otherwise it enters the standby state. The CS domain of the module is idle, not Do the processing.

In the technical solution, since the 3G wireless communication sub-module only resides in the PS domain of the TD network, the CS64 kbps service of the videophone cannot be implemented, but compared with the TD terminal, the technical solution does not have high power consumption due to the 2/3G handover. , off-network, frequent 2/3G handover, business interruption and other adverse effects, and fully exploit the advantages of 3G network bandwidth, abundant resources, suitable for data services, and the current videophone due to high tariffs, TD network coverage is not wide The problem is not used very much, so the defect has little effect.

This technical solution does not require network adjustment and upgrade, and avoids the stability factors caused by the upgrade of the existing network. Therefore, the solution can be quickly promoted, so that more and more users can feel the advantages of 3G and promote the healthy development of the TD industry chain.

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

Compared with the existing 23G dual-mode single-standby terminal technology, the method and device of the embodiment of the present invention use a dual-network dual-standby technology that takes into consideration the service expertise of the CS circuit domain of the 2G network and the data service expertise of the 3G network. Under the premise of no network adjustment, the terminal implements dual-network dual standby of TD/GSM, and does not need frequent 23G handover, which avoids frequent reselection due to 23G handover, high power consumption, and off-state of current TD mobile phones. Network and other issues. Since the network system is not required to be modified and the unstable impact caused by the upgrade of the existing network is avoided, the solution can be quickly promoted, so that more and more users can feel the advantages of 3G and promote the healthy development of the TD industry chain.

Claims

Claim

A method for communicating by a dual network dual standby terminal, comprising:

2. The method of claim 1 wherein

3. The method of claim 2, wherein

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 dual-network dual standby terminal reserves a packet data protocol (PDP) context corresponding to the PS service, and establishes A 2G data link of the 2G network switches the PDP data link corresponding to the PS service to the 2G data link.

The method of claim 1, wherein the dual network dual standby terminal comprises an application module and a wireless communication module, the application module comprises a wireless service management submodule, and the wireless communication module comprises a 3G wireless communication submodule a 2G wireless communication sub-module and an identification sub-module, wherein the identity recognition sub-module has an identification card inserted therein, and the identity identification card stores information for identity authentication of the 2G network and the 3G network;

When the user of the dual-network dual standby terminal initiates the PS service, if the 3G wireless communication sub-module monitors If the 3G network signal satisfies the condition of the signal strength, the wireless service management sub-module selects the 3G network and notifies the 3G wireless communication sub-module, and the 3G wireless communication sub-module uses the information in the identification card to perform through the 3G network. Otherwise, the wireless service management sub-module selects the 2G network and notifies the 2G wireless communication sub-module, and the 2G wireless communication sub-module uses the information in the identification card to communicate through the 2G network.

5. The method of claim 4, wherein

The method according to any one of claims 1 to 5, wherein

The 3G network is a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) network, and the 2G network is a Global System for Mobile Communications (GSM) network.

A device for communicating with a dual-network dual-standby terminal, comprising an application module and a wireless communication module; wherein the application module is configured to: when the user of the dual-network dual-standby terminal initiates a CS service, select to communicate through the 2G network. And notifying the wireless communication module; when the user of the dual-network dual standby terminal initiates the PS service, selecting to communicate through the 3G network or the 2G network, and notifying the wireless communication module;

8. The apparatus according to claim 7, wherein the application module comprises a wireless service management sub-module, and the wireless communication module comprises a 3G wireless communication sub-module, a 2G wireless communication sub-module and an identity recognition sub-module;

The wireless service management submodule is configured to: when the user of the dual network dual standby terminal initiates CS In the service, the wireless service management sub-module selects the 2G network and notifies the 2G wireless communication sub-module; when the user of the dual-network dual-standby terminal initiates the PS service, if the 3G wireless communication sub-module monitors the 3G network signal to satisfy the signal For the strength condition, select the 3G network and notify the 3G wireless communication sub-module; otherwise, select the 2G network and notify the 2G wireless communication sub-module;

9. The apparatus according to claim 8, wherein

The wireless service management sub-module is further configured to: when the initiated service is a PS service, and the 3G wireless communication sub-module communicates through the 3G network, when the current 3G network is detected according to the 3G wireless communication sub-module The signal strength is determined when the signal strength of the current 3G network is weakened to be unable to carry the PS service, and the PDP context corresponding to the PS service is reserved, and the 2G wireless communication sub-module is notified to establish a 2G data link of the 2G network, and the 2G data link After the establishment is completed, the 3G wireless communication sub-module is notified to switch the PDP data link corresponding to the PS service to the 2G data link.

10. The apparatus according to any one of claims 7 to 9, wherein