WO2013104152A1

WO2013104152A1 - Service switching method and device for multimode terminal

Info

Publication number: WO2013104152A1
Application number: PCT/CN2012/073803
Authority: WO
Inventors: 李楠; 刘劲
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-01-10
Filing date: 2012-04-11
Publication date: 2013-07-18
Also published as: CN102448136B; CN102448136A

Abstract

Disclosed are a service switching method and device for a multimode terminal. The method comprises: a packet data protocol (PDP) management layer detecting signal quality of different networks in a current network environment when packet switched (PS) service data requested by a user is transmitted between the multimode terminal and a network side through an activated first PDP link, the PDP management layer being located between a frame layer of the multimode terminal and a wireless access layer; the PDP management layer comparing the detected signal quality of different networks, and requesting activating a second PDP link corresponding to a network with optimal signal quality; and after the second PDP link is successfully activated, the PDP management layer switching a transmission link between the PDP management layer and the network side to the second PDP link. By means of the present invention, the multimode terminal can be seamlessly switched to a network currently having optimal signal quality in a network convergence environment, thereby increasing the transmission rate of the PS service data.

Description

The present invention relates to the field of communications, and in particular to a multimode terminal service switching method and apparatus. BACKGROUND OF THE INVENTION Experts assess that in the future China will form a situation in which 2G, 3G and 4G will coexist in a relatively long period of time, rather than simply upgrading and replacing. In the long-term evolution (Long-Term Evolution, LTE for short) (the transition between 3G and 4G technologies, which improves and enhances 3G air interface technology), 4G and other technical research, domestic operators are taking time Do a good job of covering and optimizing various types of networks. In addition, with the continuous coverage of 3G networks and the continuous development of smartphones, wireless data traffic is growing rapidly, putting tremendous pressure on the mobile ecosystem. According to estimates by IHS Screen Digest, about 2.3 million terabytes of data were transmitted over the wireless network in 2010, and the annual growth rate of mobile data traffic will be higher than 80% in the next few years, and will reach 30 million TB by 2014. Such a large amount of traffic has prompted wireless operators to introduce 4G infrastructure to increase connection speed and improve capacity. To date, 17 networks belonging to the 4G LTE standard have been built, and 117 operators have committed to launch such 4G networks in the next few years. Therefore, in the case of a multi-network convergence network, how to adapt to the complex network mode of multi-network convergence and provide users with high-speed packet switching (PS) services becomes an important issue. In the related art, there is only a simple switching technology of TD and Wireless Fidelity (WIFI), and there is no technical solution for multi-network convergence. At the same time, the simple switching between TD and WIFI is divided into active detection and passive switching. These two mechanisms are easy to appear in the structure and theory, and the Packet Data Protocol (PDP) link is broken. , thereby affecting the user experience of the user's PS service. How to realize seamless handover of different networks in a multi-network convergence network environment and achieve the fastest transmission speed of a single PDP link, and no effective solution has been proposed yet. SUMMARY OF THE INVENTION The present invention provides a method and apparatus for switching a multimode terminal service to solve at least the problem of seamless switching of different networks in a network environment with multiple networks. The above question. According to an aspect of the present invention, a multimode terminal service switching method is provided, including: a Packet Data Protocol (PDP) management layer transmits a user request between a multimode terminal and a network side through an activated first PDP link. In the process of packet switching (PS) service data, the signal quality of different networks in the current network environment is detected, wherein the PDP management layer is located between the frame layer of the multimode terminal and the radio access layer; the PDP management layer compares the detected The signal quality of the different networks is requested to activate the second PDP link corresponding to the network with the best signal quality; after the second PDP link is successfully activated, the PDP management layer switches the transmission link between the PDP management layer and the network side to Second PDP link. Preferably, before the multi-mode terminal and the network side transmit the user-requested packet data exchange PS service data by using the activated first PDP link, the method further includes: during the startup process of the multi-mode terminal or in response to the PS service request, Requesting to activate the first PDP link corresponding to the preset network; and responding to the request of the user, transmitting the PS service data requested by the user through the first PDP link. Preferably, after the PDP management layer switches the transmission link between the PDP management layer and the network side to the second PDP link, the method further includes: transmitting, by using the first PDP link, uplink data sent to the network side by using a virtual dedicated The network (Virtual Private Network, VPN for short) is processed and sent to the second PDP link, and the uplink data is transmitted to the network side through the second PDP link. The downlink data sent by the network side is transmitted through the VPN through the second PDP link. The process is further sent to the first PDP link, and the downlink data is transmitted to the upper application of the multimode terminal through the first PDP link. Preferably, the above signal quality comprises: a signal strength of the network, and/or a signal stability of the network. Preferably, the PDP management layer compares the detected signal quality of different networks, including: comparing the detected signal strengths of different networks, and/or comparing the signal stability of the detected different networks. Preferably, the PDP management layer requests to activate the second PDP link corresponding to the network with the best signal quality, including: requesting activation of the detected second PDP chain corresponding to the network with the best signal strength and/or signal stability in different networks road. Preferably, the PDP management layer compares the detected signal quality of the different networks, and requests the second PDP link corresponding to the network with the highest signal quality, including: the PDP management layer according to the preset correspondence between the PS service and the network. And determining whether there is a network corresponding to the currently executed PS service in the currently detected network, and if yes, requesting activation of the second PDP link corresponding to the network. According to another aspect of the present invention, a multimode terminal service switching apparatus is provided, located between a frame layer of a multimode terminal and a radio access layer, and includes: a detecting module, configured to pass between the multimode terminal and the network side In the process of transmitting the packet data exchange PS service data requested by the user by the activated first PDP link, detecting the current network The signal quality of different networks in the network environment; the evaluation module sets the signal quality of the different networks detected by the comparison detection module, requests the second PDP link corresponding to the network with the best signal quality activation; the switching module is set in the second PDP After the link is successfully activated, the transmission link between the PDP management layer and the network side is switched to the second PDP link. Preferably, the foregoing apparatus further includes: a first transmission module, configured to send, by using the first PDP link, uplink data sent to the network side to the second PDP link via VPN processing, and uplink data by using the second PDP link Transmitting to the network side; the second transmission module is configured to retransmit the downlink data sent by the network side to the first PDP link by using the second PDP link, and transmit the uplink data to the multimode terminal by using the first PDP link The upper application. Preferably, the signal quality detected by the detecting module comprises: a signal strength of the network, and/or a signal stability of the network. Preferably, the foregoing evaluation module includes: a first comparing unit, configured to compare signal strengths of different networks detected by the detecting module; and/or a second comparing unit, configured to compare signal stability of different networks detected by the detecting module. Through the present invention, the PDP management layer detects and evaluates the signal quality of different networks in the network environment where the multimode terminal is located during the PS service process, and requests the PDP link corresponding to the network with the best signal quality to be activated, and the PDP management layer and the PDP management layer are The transmission link between the network side is switched to the activated PDP link, and the PDP management layer and the upper layer application maintain the PDP link before the handover, which realizes seamless handover under multi-network convergence, and improves the PDP chain in the network handover process. Road stability. According to the evaluation result of the signal quality, the PS service is performed through the network with the best signal quality, so that the transmission speed of the single-channel PDP link is the fastest, and the user experience of the PS service is improved. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the structure of a multimode terminal service switching apparatus according to an embodiment of the present invention; FIG. 2 is a block diagram showing a preferred multimode terminal service switching apparatus according to an embodiment of the present invention; FIG. 4 is a flowchart of a multi-mode terminal service switching method according to an embodiment of the present invention; FIG. 5 is a structural block diagram of a multimode terminal according to an embodiment of the present invention; FIG. 6 is a structural block diagram of a PDP management layer according to an embodiment of the present invention; and FIG. 7 is a schematic diagram of a multimode terminal service switching process according to an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. In the related art, in the network environment of the multi-network convergence, the problem that the PS service seamlessly switches between different networks and the transmission speed of the single-channel PDP link is the fastest, the embodiment of the present invention provides a multi-mode. Terminal service switching method and device. Taking the intelligent multi-mode terminal of the Android as an example, the PDP management layer is added to the frame layer and the radio access layer of the multi-mode terminal to manage the PDP links of different networks, so that the network environment in the multi-network convergence can also be guaranteed. The purpose of the single-channel PS data link speed and stability is optimal, thereby improving the user experience of the PS service. Embodiment 1 According to an embodiment of the present invention, a multimode terminal service switching apparatus is provided, located between a frame layer of a multimode terminal and a radio access layer, for detecting and evaluating signal quality of different networks, and activating signal quality is the most A PDP link corresponding to a good network switches the transmission link between the PDP management layer and the network side to the activated PDP link, achieving seamless handover under multi-network convergence, and making the transmission speed of the single-channel PDP link the most. fast. 1 is a structural block diagram of a multimode terminal service switching apparatus according to an embodiment of the present invention. As shown in FIG. 1, the apparatus may include: a detecting module 10, an evaluating module 20, and a switching module 30. The detecting module 10 is configured to detect, during the process of transmitting, by the multi-mode terminal and the network side, the user-requested packet data exchange (PS) service data by using the activated first PDP link, detecting different networks in the current network environment. Signal quality. The evaluation module 20 is coupled to the detection module 10, and sets the signal quality of the different networks detected by the comparison detection module 10, and requests the second PDP link corresponding to the network with the best signal quality (ie, the network with the best signal quality). Corresponding PDP link, in the embodiment of the present invention, is referred to as a second PDP link for convenience of description. The switching module 30 is coupled to the evaluation module 20, and is configured to switch the transmission link between the PDP management layer and the network side to the second PDP link after the second PDP link is successfully activated. In the embodiment of the present invention, during the process of the PS service, the signal quality of different networks is detected and evaluated, and the PDP link corresponding to the network with the best signal quality is activated, and the transmission link between the PDP management layer and the network side is switched. To the active PDP link, and the PDP management layer maintains the PDP link before switching with the upper layer application. The seamless handover under multi-network convergence has improved the stability of the PDP link during network switching. According to the evaluation result of signal quality, the PS service is performed through the network with the best signal quality, so that the transmission speed of the single-channel PDP link is the fastest. In a preferred embodiment of the present invention, the first PDP link corresponding to the preset network may be requested to be activated during the startup process of the multimode terminal or in response to the PS service request. After the first PDP link is successfully activated, the multimode terminal transmits the PS service data requested by the user through the activated first PDP link in response to the user's request. For example, the default network of the multimode terminal can be set to be an LTE network. Then, during the startup process or in response to the PS service request, the multimode terminal activates the PDP link of the LTE network (ie, the first PDP link), and the PDP through the LTE network. The link performs the PS service requested by the user. With the preferred embodiment, the default network of the PS service can be set by the multimode terminal, which enhances the flexibility of the user to select the PS service network. After the switching module 30 switches the transmission link between the PDP management layer and the network side to the second PDP link, the PDP management layer can manage the PS service data transmission of the first PDP link and the second PDP link, and the multimode will be The PS service data sent by the upper layer application of the terminal is transmitted to the PDP management layer through the first PDP link, and the PDP management layer transmits the PS service data to the network side through the second PDP link. Meanwhile, the PS service data sent by the network side is The PDP management layer transmits the PS service data sent by the network side to the upper layer application of the multimode terminal through the first PDP link. In order to achieve the above objective, in a preferred embodiment of the present invention, as shown in FIG. 2, the foregoing apparatus may further include: a first transmission module 40, configured to send uplink data that is sent to the network side by using the first PDP link. And transmitting to the second PDP link via the VPN process, and transmitting the uplink data to the network side through the second PDP link. The second transmission module 50 is configured to retransmit the downlink data sent by the network side to the first PDP link by using the second PDP link, and transmit the uplink data to the upper application of the multimode terminal by using the first PDP link. . With the preferred embodiment, the upper layer application maintains the connection with the activated first PDP link, the PDP management layer completes the switching of the second PDP link, and performs data transmission with the network side through the second PDP link, thereby implementing multiple networks. The seamless handover of different networks in the convergence provides an optimal network for the multi-mode terminal to perform PS services, improving the user experience of the PS service. In a preferred embodiment of the present invention, in order to evaluate the signal quality of different networks, the detecting module 10 can detect the signal strength of different networks, and the multimode terminal can perform the PS service through the network with the best signal strength. The module 20 may compare the signal strengths of different networks detected by the detection module 10, and request to activate a second PDP link corresponding to the network with the best signal strength. The switching module 30 switches the transmission link between the PDP management layer and the network side to the second PDP link corresponding to the network with the best signal strength. With the preferred embodiment, the signal strength of the network is used as a parameter for network signal quality evaluation, and the PS service with the best signal strength is selected for the multimode terminal, and the transmission speed of the PS service is improved. In addition, the detection module 10 can also detect the signal stability of different networks, and the multi-mode terminal can perform the PS service through the network with the optimal signal stability. At this time, the evaluation module 20 can compare the signals of the different networks detected by the detection module 10. Stability, requesting a second PDP link corresponding to the network with the best signal stability. The switching module 30 switches the transmission link between the PDP management layer and the network side to the second PDP link corresponding to the network with the best signal stability. For example, the evaluation module 20 can determine whether the UE is currently in high-speed movement by using the positioning function, and if yes, the signal stability of the UE is poor. With the preferred embodiment, the signal stability of the network is used as a parameter for network signal quality evaluation, and the PS service with the optimal signal stability is selected for the multimode terminal, and the transmission speed of the PS service is improved. Further, the detecting module 10 can simultaneously detect the signal strength and signal stability of different networks, and the multimode terminal can perform the PS service through the network with the best signal strength and signal stability. At this time, as shown in FIG. 3, the evaluation module 20 may include: a first comparison unit 202, configured to set the signal strength of different networks detected by the comparison detection module 10; and a second comparison unit 204, configured to set signal stability of different networks detected by the comparison detection module 10. The evaluation module 20 may request to activate a second PDP link corresponding to the network with the best signal strength and signal stability according to the comparison result. Preferably, the weights of the signal strength and the signal stability may be set according to actual conditions, so that the evaluation result can simultaneously refer to the signal strength and the signal stability. After the signal quality evaluation is completed, the switching module 30 is triggered to switch the transmission link between the PDP management layer and the network side to the second PDP link corresponding to the network with the best signal strength and signal stability, and the multimode terminal passes the second The PDP link performs PS services with the network side. With the preferred embodiment, the signal strength and signal stability of the network are used as parameters of the network signal quality evaluation, and the PS service with the optimal signal stability is selected for the multi-mode terminal, thereby further improving the transmission speed of the PS service. . Corresponding to the foregoing apparatus provided by the embodiment of the present invention, the embodiment of the present invention further provides a multi-mode terminal service switching method, which can detect and evaluate signal quality of different networks during the PS service process, and activate the signal quality of the best. The PDP link corresponding to the network switches the transmission link between the PDP management layer and the network side to the activated PDP link to implement seamless handover under multi-network convergence, and makes the transmission speed of the single-channel PDP link the fastest. FIG. 4 is a flowchart of a multi-mode terminal service switching method according to an embodiment of the present invention. As shown in FIG. 4, the method may include the following steps (step S402-step S406): Step S402, the PDP management layer is in multi-mode During the process of transmitting the PS service data requested by the user through the activated first PDP link, the terminal and the network side detect the signal quality of different networks in the current network environment, where the PDP management layer is located in the frame layer of the multimode terminal. Between the wireless access layer and the wireless access layer. Step S404, the PDP management layer compares the detected signal quality of different networks, and requests to activate a second PDP link corresponding to the network with the best signal quality. Step S406, after the second PDP link is successfully activated, the PDP management layer switches the transmission link between the PDP management layer and the network side to the second PDP link. Through the embodiment of the present invention, the PDP management layer detects and evaluates the signal quality of different networks in the network environment where the multimode terminal is located, and requests the PDP link corresponding to the network with the best signal quality to be activated (ie, the first The two PDP links are used to switch the transmission link between the PDP management layer and the network side to the active PDP link, and the PDP management layer and the upper layer application maintain the PDP link before the handover, thereby realizing the multi-network convergence. The seam switching improves the stability of the PDP link during network switching. According to the evaluation result of the signal quality, the PS service is performed through the network with the best signal quality, so that the transmission speed of the single-channel PDP link is the fastest, and the user experience of the PS service is improved. The multimode terminal may request to activate the first PDP link corresponding to the preset network during the booting process or in response to the PS service request. After the first PDP link is successfully activated, the multimode terminal transmits the PS service data requested by the user through the activated first PDP link in response to the user's request. Therefore, in a preferred embodiment of the present invention, before the multimode terminal and the network side transmit the user-requested packet data exchange PS service data through the activated first PDP link, the multimode terminal is in the boot process. Or, in response to the PS service request, the first PDP link corresponding to the preset network may be requested to be activated. After the first PDP link is successfully activated, the user requests the PS service data through the first PDP link. For example, the default network of the multimode terminal can be set to be an LTE network. Then, during the startup process or in response to the PS service request, the multimode terminal activates the PDP link of the LTE network (ie, the first PDP link), and the PDP through the LTE network. The link performs the PS service requested by the user. In a preferred embodiment of the present invention, in order to evaluate the signal quality of different networks, the PDP management layer can detect the signal strength of different networks, and the multimode terminal can perform the PS service through the network with the best signal strength. The detected signal strength of different networks is requested to activate a second PDP link corresponding to the network with the best signal strength. After the second PDP link is successfully activated, the PDP management layer switches the transmission link between the PDP management layer and the network side to the second PDP link corresponding to the network with the best signal strength. With the preferred embodiment, the signal strength of the network is used as a parameter for network signal quality evaluation, and the PS service with the best signal strength is selected for the multimode terminal, and the transmission speed of the PS service is improved. In addition, the PDP management layer can also detect the signal stability of different networks. The multimode terminal can perform the PS service through the network with the best signal stability. At this time, the signal stability of the detected different networks can be compared, and the activation signal stability is requested. The second PDP link corresponding to the optimal network. After the activation of the second PDP link is successful, the PDP management layer switches the transmission link between the PDP management layer and the network side to the second PDP link corresponding to the network with the best signal stability. For example, the evaluation module 20 can determine whether the UE is currently in high-speed movement by using the positioning function. If yes, the signal stability of the UE is poor. If not, the signal stability of the UE is good. Through this In the preferred embodiment, the signal stability of the network is used as a parameter for evaluating the quality of the network signal, and the PS service with the optimal signal stability is selected for the multimode terminal, and the transmission speed of the PS service is improved. Further, the PDP management layer can simultaneously detect the signal strength and signal stability of different networks, and the multimode terminal can perform the PS service through the network with the best signal strength and signal stability. At this time, the detected different networks can be simultaneously compared. The signal strength and signal stability are requested, and a second PDP link corresponding to the network with the highest signal strength and signal stability is requested. Preferably, the weights of the signal strength and the signal stability may be set according to actual conditions, so that the evaluation result can simultaneously refer to the signal strength and the magnitude of the signal stability. After the signal quality assessment is completed, the PDP management layer switches the transmission link between the PDP management layer and the network side to the second PDP link corresponding to the network with the best signal strength and signal stability, and the multimode terminal passes the second PDP chain. The road and the network side perform PS services. With the preferred embodiment, the signal strength and signal stability of the network are used as parameters of the network signal quality evaluation, and the PS service with the optimal signal stability is selected for the multi-mode terminal, thereby further improving the transmission speed of the PS service. . In a preferred embodiment of the present invention, the PDP management layer compares the detected signal quality of different networks, and requests the second PDP link corresponding to the network with the highest signal quality, which may include: Corresponding relationship between the preset PS service and the network, determining whether there is a network corresponding to the currently executed PS service in the currently detected network, and if yes, requesting activation of the second PDP link corresponding to the network. For example, when a network corresponding to the PS service of the type is detected, the PDP link of the corresponding network is activated, and the link between the PDP management layer and the network side is switched to the activated PDP link. With the preferred embodiment, the optimal network can be selected for the PS service with status information for data transmission, which improves the user experience of the PS service.

After the PDP management layer switches the transmission link between the PDP management layer and the network side to the second PDP link, the PDP management layer can manage the PS service data transmission of the first PDP link and the second PDP link, and the multimode will be The PS service data sent by the upper layer application of the terminal is transmitted to the PDP management layer through the first PDP link, and the PDP management layer transmits the PS service data to the network side through the second PDP link. Meanwhile, the PS service data sent by the network side is The PDP management layer transmits the PS service data sent by the network side to the upper layer application of the multimode terminal through the first PDP link. Therefore, in a preferred embodiment of the present invention, after the PDP management layer switches the transmission link between the PDP management layer and the network side to the second PDP link, the PDP management layer may send the network to the network through the first PDP link. The uplink data of the side is sent to the second PDP link through the VPN process, and the uplink data is transmitted to the network side through the second PDP link. Meanwhile, the downlink data sent by the network side can be processed by the VPN through the second PDP link. And transmitting to the first PDP link, and transmitting the downlink data to the multimode terminal through the first PDP link The upper application. Preferably, the VPN may be constructed at the PDP management layer, and the data uploaded through the second PDP link is uploaded to the AP based on the VPN. Embodiment 2 According to the embodiment of the present invention, taking the Android platform of the smart phone as an example, according to the architecture of the Android platform, the PS service data is from an application layer application processor (AP) to a framework layer (Framework), and from the framework layer. Then go to the Radio Interface Layer (RIL) and finally send it to the Communication Processor (CP) mechanism. The PDP management layer is added to the framework layer and the radio access layer to manage the PDP link, and the speed and stability of the single-channel PS data link can be guaranteed under the condition of EDGE/TD/WIFI/LTE multi-network convergence. Optimal state. In order to adapt to the complex network mode of multi-network convergence and achieve the fastest download speed of single-channel PDP link, in the multi-mode terminal shown in Figure 5, the application subsystem (AP) constructs a link between RIL and Framework. The PDP management layer activates all the way to the PDP by default. When the PDP management layer receives the network bearer and needs to perform the inter-network handover to obtain the optimal PS download state, the PDP management layer sends the request to the RIL while maintaining the current PDP link, and activates another PDP chain on the current optimal network. After the activation succeeds, the data transmission is switched to the PS link, and the information such as the IP gateway of the latest activated PS link is reported to the PDP management layer, but not reported to the AP. The VPN is built in the PDP management layer, and the data uploaded by the latest PS link is uploaded to the AP based on the VPN. Therefore, the single-channel PS download speed can be ensured to be the fastest, and the PS service can be seamlessly switched between different networks without disconnection.

The framework module in the Android platform is mainly used for receiving a request message sent by the processing application, and determining whether the request message is a PS service request, if the request message is sent to the PDP management layer for processing, and the PS data interaction; otherwise, The request message is sent directly to the RIL for processing.

The PDP management layer mainly processes the default PDP activation request message sent by the framework during the boot process, and simultaneously sends a PDP activation request message according to the TD, WIFI, and LTE network environment management. Building a VPN for data transmission management in the PDP management layer can be divided into the following two cases: 1) PS service with status information. The PDP management layer receives the PDP activation request, and the different services correspond to different PDP links. The PDP link of the framework layer is mapped to the PDP link of the underlying PDP link. data transmission. For example, when a multimode terminal activates a PDP link of a 3G network by default during the boot process, when the PDP management layer receives a PDP activation request for the MMS service, if the multimode terminal detects a network suitable for the MMS service (such as GPRS), The PDP link between the PDP management layer and the network is switched to the PDP link of the network corresponding to the MMS service. Thus, the PS service with status information can The most suitable network is selected for data transmission, and the upper PDP link is kept disconnected during the handover process, and the seamless handover of the network is realized.

2) The PS service without state information, the PDP management layer integrates the network detection mechanism, and detects the terminal radio frequency circuit receiving the TD/WIFI/LTE network signal in real time, so as to switch the PDP link layer in real time during the PS download process. Ensure that the single-channel PDP link is optimal. The active PDP link request after the active network is detected during the PS service is independently completed by the PDP management layer, and the network status is maintained in real time, except that the first default PDP link is actively sent by the boot process. FIG. 6 is a structural block diagram of a PDP management layer according to an embodiment of the present invention. As shown in FIG. 6, the PDP management layer may include: a network signal detection module 602 and an evaluation calculation module 604. The network signal detecting module 602 (corresponding to the detecting module 10 described above) is configured to detect the current network environment in the process of transmitting the PS service data requested by the user through the activated PDP link between the multimode terminal and the network side. The signal quality of different networks. The evaluation calculation module 604 (corresponding to the evaluation module 20 described above) sets the signal quality of the different networks detected by the comparison network signal detection module 602. Preferably, the signal quality detected and evaluated by the embodiments of the present invention may include: signal strength and signal stability. The RIL layer mainly implements the PDP activation request message sent by the PDP management layer to be converted into a specific AT command and sent to the CP to activate the corresponding PDP link. The CP mainly implements the 3GPP protocol support required by the 3G terminal in performing the service process, and directly interacts with the air interface network. FIG. 7 is a schematic diagram of a multi-mode terminal service switching process according to an embodiment of the present invention. The following describes the embodiment of the present invention in further detail with reference to FIG. The terminal is powered on, and the default PDP link is activated based on TD or EDGE according to the 3G network coverage. The user operates the application to initiate a PS download request. The terminal is in position 1 and the normal network coverage area has only 3G network, and the PS downloads data transmission through the 3G network. The multimode terminal moves to location 2 and enters the TD and WIFI network coverage area. At this time, the network detecting module 602 detects that there are two networks, TD and WIFI, at the current location, and comprehensively calculates and evaluates the signal strength and stability, and performs evaluation processing on the current cell information, if the WIFI signal strength is weak, and the user is at a high speed. In the mobile, if the TD is still a relatively stable signal, the handover is not performed; if the signal strength of the WIFI detected in the current environment is strong, and the user is stable in the cell information, the handover is performed after the comprehensive evaluation. The link that activates the WIFI is sent to the PDP management layer. After the activation is successful, the PDP management layer performs the handover again, and if the handover succeeds, it is reported to the application. The multimode terminal moves to position 3. The network detection module 602 detects that there are three networks of TD, WIFI, and LTE in the current location, and performs comprehensive calculation and evaluation on signal strength and stability, and the PDP management layer performs evaluation of the switching network type and handover. The PDP management actively sends a deactivation request to the RIL to release the PDP link corresponding to the LTE network, refreshes the maintained PDP, and interrupts data transmission to the PDP link. Through the embodiment of the present invention, the multimode terminal performs PS download on the mobile, regardless of the EDGE in the network environment.

One or more of TD, WIFI, and LTE networks, the terminal maximizes the optimal network in the available network at the current location through the PDP management layer. The system uses a separate link to establish a new PDP link, and then seamlessly switches the new PDP link. The network detection module performs signal detection on multiple networks, and comprehensively calculates and evaluates signal strength and stability. And the network switching is performed after the current cell information of the user is evaluated, and the single-channel PS downloading rate is always in an optimal state after the switching, thereby improving the user experience of the PS service. From the above description, it can be seen that the present invention achieves the following technical effects: The PDP management layer detects and evaluates the signal quality of different networks in the network environment where the multimode terminal is located during the PS service process, and requests the activation signal quality to be the most The PDP link corresponding to the excellent network switches the transmission link between the PDP management layer and the network side to the activated PDP link, and the PDP management layer and the upper-layer application maintain the PDP link before the handover, thereby implementing multi-network convergence. The seamless handover improves the stability of the PDP link during network switching. According to the evaluation result of the signal quality, the PS service is performed through the network with the best signal quality, so that the transmission speed of the single-channel PDP link is the fastest, and the user experience of the PS service is improved. At the same time, taking the signal strength and signal stability of the network as the parameters of network signal quality evaluation, the PS service with the best signal stability is selected for the multimode terminal, and the transmission speed of the PS service is further improved. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above description is only a 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.

Claims

Claim

A method for switching a multimode terminal service, comprising:

The packet data protocol PDP management layer detects the signal quality of different networks in the current network environment during the process of transmitting the user-requested packet-switched PS service data between the multi-mode terminal and the network side through the activated first PDP link. The PDP management layer is located between a frame layer of the multimode terminal and the radio access layer;

The PDP management layer compares the detected signal quality of different networks, and requests to activate a second PDP link corresponding to the network with the best signal quality;

After the second PDP link is successfully activated, the PDP management layer switches the transmission link between the PDP management layer and the network side to the second PDP link.

The method according to claim 1, wherein before the transmitting, by the multi-mode terminal and the network side, the user-requested packet data exchange PS service data by using the activated first PDP link, the method further includes: Requesting to activate the first PDP link corresponding to the preset network during the startup of the multimode terminal or in response to the PS service request;

In response to the user's request, the PS service data requested by the user is transmitted through the first PDP link.

The method according to claim 1, wherein, after the PDP management layer switches the transmission link between the PDP management layer and the network side to the second PDP link, the method further includes:

Upgrading, by the first PDP link, uplink data sent to the network side to the second PDP link via VPN processing, and transmitting the uplink data to the network by using the second PDP link Transmitting, by the second PDP link, downlink data sent by the network side to the first PDP link via a virtual private network VPN, and transmitting the downlink data to the multiple by using the first PDP link The upper layer application of the mode terminal.

The method according to any one of claims 1 to 3, wherein the signal quality comprises: a signal strength of the network, and/or a signal stability of the network.

The method according to claim 4, wherein the PDP management layer compares the detected signal quality of different networks, including: Comparing the detected signal strengths of the different networks, and/or comparing the detected signal stability of different networks.

The method according to claim 5, wherein the requesting the PDP management layer to activate the second PDP link corresponding to the network with the best signal quality comprises: requesting activation of the detected signal strength in different networks and/or Or the second PDP link corresponding to the network with the best signal stability.

The method according to any one of claims 1 to 3, wherein the PDP management layer compares the detected signal quality of different networks, and requests a second PDP chain corresponding to a network with an optimal signal quality. Road, including:

The PDP management layer determines, according to the preset correspondence between the PS service and the network, whether there is a network corresponding to the currently executed PS service in the currently detected network, and if yes, requests to activate the second PDP chain corresponding to the network. road.

8. A multi-mode terminal service switching device, located between a frame layer of a multi-mode terminal and a radio access layer, comprising:

a detecting module, configured to detect, during the process of transmitting, by the multi-mode terminal and the network side, the packet data exchange PS service data requested by the user by using the activated first PDP link, detecting signal quality of different networks in the current network environment;

An evaluation module, configured to compare the signal quality of different networks detected by the detection module, and request a second PDP link corresponding to a network with an optimal signal quality;

The switching module is configured to switch the transmission link between the PDP management layer and the network side to the second PDP link after the second PDP link is successfully activated.

9. The device according to claim 8, wherein the device further comprises:

a first transmission module, configured to send, by using the first PDP link, uplink data sent to the network side to the second PDP link via VPN processing, and send the uplink data by using the second PDP link Transfer to the network side;

a second transmission module, configured to retransmit, by using the second PDP link, downlink data sent by the network side to the first PDP link via a virtual private network VPN process, and using the first PDP link The uplink data is transmitted to an upper layer application of the multimode terminal.

10. Apparatus according to claim 8 or claim 9, wherein the signal quality detected by the detection module comprises: signal strength of the network, and/or signal stability of the network.

The device according to claim 10, wherein the evaluation module comprises: a first comparing unit, configured to compare the signal strength of the different network detected by the detecting module; and/or

And a second comparing unit, configured to compare the signal stability of different networks detected by the detecting module.