CN102098753B - Method and terminal for selecting service bearing network - Google Patents

Abstract

The invention provides a method and a terminal for selecting a service bearing network. In the method, a service bearing network is selected according to service type and 3G (3rd generation telecommunication) network signal quality, and a threshold of cell reselection among different systems is improved, so that probability that reselection among different systems frequently occurs in a terminal is reduced, success rate of being called of the terminal is improved, power consumption of the terminal is saved, and standby time of the terminal is prolonged; under a condition of ensuing excellent service use experience of users, the advantages of the prior 2G (2nd Generation) and 3G networks are fully used, rational service division is implemented, and the prior network resource is rationally used.

Description

A method and terminal for selecting a service bearer network

technical field

The invention relates to a mobile communication network, in particular to a method for selecting a service bearing network and a terminal.

Background technique

The third-generation mobile communication (3G) networks, such as TD-SCDMA, WCDMA and CDMA2000 networks, have been put into commercial use. The 3G network provides users with a variety of services, such as videophone, video message, high-speed Internet access, video surveillance, mobile TV and many other services. Although the 3G network is becoming more and more mature and the commercial level is increasing rapidly, there is still a certain gap between the service quality expected by users. Through a large-scale network test, it is found that due to the limitations of the current 3G network coverage, capacity level, terminal equipment performance and type, etc., the service quality of the 3G network is still significantly lower than that of the second generation mobile communication (2G) network, such as the GSM network. difference.

At present, the mobile network operation mainly adopts the integration of 2G and 3G to deploy the network. How to cooperate and cooperate between the two networks has become the focus of research. On the one hand, the quality of circuit switched domain (CS, Circuit Switch) services (such as traditional voice services) has high requirements for network coverage and quality, and the current mature 2G network (such as GSM network) can meet the requirements well; the other On the one hand, compared with the 2G network, the advantage of the 3G network is that it can provide better services for packet switching domain (PS, Packet Switch) services.

The prior art provides a reselection/handover method from a 2G network to a 3G network, and the specific process is as follows:

Step 11, the terminal resides in the 2G network;

Step 12, the terminal obtains two parameters from the control signaling sent by the network side, one is the starting condition for starting the signal measurement of the 3G network, and the other is to execute the cell reconfiguration from the 2G network to the 3G network The selected absolute threshold of the inter-system reselection decision (that is, the absolute value of the signal level corresponding to the inter-system reselection decision threshold Tdd-offset).

Step 13, the terminal judges whether the signal of the 2G serving cell where it is currently camping meets the above-mentioned start-up condition: if so, proceed to step 14, otherwise continue to execute step 13.

Step 14, carry out cell search, judge whether the signal strength Rtd-SCDMA of the 3G cell (such as TD-SCDMA cell) searched is all greater than intersystem reselection judgment absolute threshold value within a period of time: if so, enter step 15; Otherwise Return to step 13.

Step 15, initiate cell reselection or handover to the target 3G cell, and camp or handover to the target 3G cell.

During the execution of the above-mentioned cell reselection decision, the signal strength of the TD-SCDMA cell measured by the terminal is Rtd-scdma. If the value of Rtd-scdma is greater than the absolute value of Tdd-offset within a certain period of time, the terminal will execute to the 3G cell (such as TD-offset - SCDMA cell) reselection or handover. The Tdd-offset value is sent to the terminal by the 2G cell (GSM cell) through a broadcast message, and can be configured by the operator. A corresponding relationship between the Tdd-offset value and the absolute value of the signal level corresponding to the Tdd-offset value is shown in Table 1 below:

TDD-offset value Corresponding signal level (dBm) meaning 0 -105 After starting the measurement of the TD cell, as long as the TD signal level is higher than -105dBm for a certain period of time, it will reselect to the TD network 1 -102 in the same way 2 -99 in the same way 3 -96 in the same way 4 -93 in the same way 5 -90 in the same way 6 -87 in the same way 7 -84 in the same way 8 -81 in the same way 9 -78 in the same way 10 -75 in the same way 11 -72 in the same way 12 -69 in the same way 13 -66 in the same way 14 -63 in the same way 15 -60 in the same way

Table 1

The above-mentioned reselection/handover method from the 2G network to the 3G network in the prior art mainly has the following disadvantages: due to the poor coverage quality of the current 3G network, reselection or handover between different systems often occurs, and the call or data service remains Switching between different systems during the process may increase the call drop rate or drop rate, and will increase the power consumption of the terminal and reduce the standby time of the terminal. At the same time, because the terminal cannot establish the called service during the process of reselecting different systems in the idle state, so when the terminal frequently reselects different systems, the calling success rate of the terminal will be reduced. Moreover, the above solution in the prior art cannot rationally use the network according to the characteristics of various networks.

Another reselection/handover method from a 2G network to a 3G network in the prior art specifically includes: when the terminal is powered on, it preferentially resides on the GSM network through the guidance of the GSM network system message and the 3G network system message; the terminal detects the user-initiated When the service type is 3G characteristic service and detects that there is a 3G signal, the terminal first initiates inter-system cell reselection, reselects to the 3G network, and then initiates a 3G characteristic service request to the 3G network. Before initiating 3G characteristic services, this solution needs to be reselected to the 3G network, and then initiates a 3G characteristic service request on the 3G network. This solution has the following disadvantages:

The Tdd-offset threshold set by the network is generally relatively low, which can only ensure that the terminal can obtain the service with the lowest quality guarantee after reselecting/switching to the 3G network, and when the 3G network signal quality is not good, the 3G special service is initiated. The second is to increase the transmit power of the terminal and reduce the system capacity of the entire 3G system. In addition, in this solution, when users use any 3G special services, they will find that there is a long waiting delay (reselection time between different systems is 6-8 seconds), which will seriously affect user experience, especially when users send data When using PS services such as MMS with a small volume or browsing simple Web pages, the time delay caused by reselection is quite large compared with the service processing time delay, which seriously reduces user experience. For example: a 40KB MMS, the original sending time may only need 5-6 seconds; but the reselection time of different systems is 6-8 seconds, which greatly increases the time required for sending and reduces the user experience.

It can be seen that there are some deficiencies in the above-mentioned reselection/handover methods from the 2G network to the 3G network in the prior art. Therefore, how to rationally utilize network resources in a communication network where 2G network and 3G network coexist, give full play to the respective characteristics of the two networks, and improve user service quality has become a very important issue.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method and a terminal for selecting a service bearer network, so as to rationally utilize existing network resources and improve user service quality according to specific service types.

In order to solve the problems of the technologies described above, the present invention provides the following solutions:

A method for selecting a service bearer network, comprising:

When a terminal residing in the 2G network detects that the user initiates a PS service in the packet switching domain, it judges whether the signal quality measurement value of the 3G network is greater than a preset reselection threshold offset and the intersystem reselection from the 2G network to the 3G network. The sum of the absolute threshold values for selection decisions, wherein the reselection threshold offset is a positive number;

When the signal quality measurement value of the 3G network is greater than the sum value, the terminal reselects to the 3G network by performing cell reselection, and executes the PS service in the 3G network.

Preferably, in the above-mentioned method, also include:

After the terminal is turned on, if it detects the signals of the 2G network and the 3G network at the same time, it initially resides in the 2G network.

Preferably, in the above-mentioned method, also include:

When the signal quality measurement value of the 3G network is not greater than the sum value, the terminal executes the PS service in the 2G network.

Preferably, in the above-mentioned method, also include:

When the signal quality measurement value of the 3G network is not greater than the sum value, the terminal judges whether the signal quality measurement value of the 3G network is greater than the inter-system reselection decision absolute threshold:

If so, by performing cell reselection, reselect to the 3G network, and execute the PS service in the 3G network;

Otherwise, execute the PS service in the 2G network.

Preferably, in the above-mentioned method, also include:

When the signal quality measurement value of the 3G network is not greater than the sum value, the terminal judges whether the signal quality measurement value of the 3G network is greater than the inter-system reselection decision absolute threshold:

If so, execute the PS service in the 2G network, and further judge whether the PS service is executed within a predetermined time: if the execution is completed, this process is ended; if the execution is not completed, stop in the 2G network Execute the PS service, and reselect to the 3G network by performing cell reselection, and execute the PS service in the 3G network;

Otherwise, execute the PS service in the 2G network.

Preferably, in the above-mentioned method, also include:

After executing the PS service in the 3G network, the terminal further performs cell reselection to camp on the 2G network.

Preferably, in the above-mentioned method, also include:

The terminal executes the CS service in the 2G network when detecting that the user initiates the CS service in the circuit switched domain.

The present invention also provides a terminal, including: a service detection unit, a first judgment unit, a cell reselection unit, and a first service execution unit; wherein,

The service detection unit is used to detect the service initiated by the user when the terminal resides in the 2G network, and trigger the first judgment unit when it is detected that the service initiated by the user is a PS service in the packet switching domain;

The first judging unit is configured to judge whether the signal quality measurement value of the 3G network is greater than a preset reselection threshold offset and whether the intersystem reselection decision from the 2G network to the 3G network is absolute according to the triggering of the service detection unit The sum value of the threshold value, and when the signal quality measurement value of the 3G network is greater than the sum value, trigger the cell reselection unit;

The cell reselection unit is configured to reselect the terminal to a 3G network by performing cell reselection according to the trigger of the first judging unit;

The first service execution unit is configured to execute the PS service in the 3G network after the terminal reselects to the 3G network.

Preferably, the above-mentioned terminal also includes:

The initial resident unit is configured to initially resident in the 2G network if the signals of the 2G network and the 3G network are detected at the same time after the terminal is turned on.

Preferably, the above terminal further includes a second service execution unit;

The first judgment unit is further configured to trigger the second service execution unit when the signal quality measurement value of the 3G network is not greater than the sum value;

The second service executing unit is configured to execute the PS service in the 2G network according to the trigger of the first judging unit.

Preferably, the above terminal further includes a second judgment unit and a second service execution unit;

The first judging unit is further configured to trigger the second judging unit when the signal quality measurement value of the 3G network is not greater than the sum value;

The second judging unit is configured to judge whether the signal quality measurement value of the 3G network is greater than the absolute threshold value of the inter-system reselection judgment according to the triggering of the first judging unit: if so, trigger the cell A reselection unit; otherwise, trigger the second service execution unit;

The cell reselection unit is further configured to reselect the terminal to a 3G network by performing cell reselection according to the trigger of the second judging unit;

The second service executing unit is configured to execute the PS service in the 2G network according to the trigger of the second judging unit.

Preferably, the terminal above further includes a second judging unit, a second service execution unit, and a third judging unit;

The first judging unit is further configured to trigger the second judging unit when the signal quality measurement value of the 3G network is not greater than the sum value;

The second judging unit is configured to judge whether the signal quality measurement value of the 3G network is greater than the absolute threshold value of the inter-system reselection judgment according to the triggering of the first judging unit: if so, trigger the second judging unit Three judging units and the second business judging unit; otherwise, trigger the second business executing unit;

The second service executing unit is configured to execute the PS service in the 2G network according to the trigger of the second judging unit;

The third judging unit is configured to judge whether the second service executing unit finishes executing the PS service within a predetermined time according to the trigger of the second judging unit: if yes, end the operation; otherwise, control the The second service execution unit stops executing the PS service, and triggers the cell reselection unit;

The cell reselection unit is further configured to reselect the terminal to a 3G network by performing cell reselection according to the trigger of the third judging unit.

Preferably, in the above-mentioned terminal, the cell reselection unit is further configured to camp the terminal in the 2G network.

Preferably, in the above terminal, the service detection unit is further configured to trigger the second service execution unit when detecting that the service initiated by the user is a CS service in the circuit switched domain;

The second service execution unit is further configured to execute the CS service in the 2G network according to the trigger of the service detection unit.

It can be seen from the above that the method and terminal for selecting a service-carrying network provided by the present invention select a service-carrying network according to the specific service type and the signal quality of the 3G network, and the present invention increases the threshold for cell reselection between different systems , so that the probability of frequent reselection of different systems in the terminal is reduced, thereby improving the call success rate of the terminal, saving power consumption of the terminal, prolonging the standby time of the terminal, and on the premise of ensuring a good service experience for the user, Make full use of the respective advantages of existing 2G and 3G networks, realize reasonable business distribution, and rationally utilize existing network resources. In addition, the present invention further implements the PS service by directly reselecting to the 3G network when the signal quality of the 3G network is normal, and does not perform reselection when the signal quality of the 3G network is not good, and executes the PS service in the 2G network. The service uses the current 2G bandwidth to serve users, which not only makes full use of the 2G bandwidth, but also avoids the impact on the 3G network caused by high-power transmission after the terminal reselects to the 3G network. In addition, when the signal quality of the 3G network is average, the present invention further performs reselection based on the predetermined time set by the terminal, so that the PS service with a small amount of data is directly completed in the 2G network and no longer reselects to the 3G network. In order to save the time occupied by reselection between different systems; and for PS services with a large amount of data, reselection is performed in the 3G network to make full use of the advantages of the high data service bearing capacity provided by the 3G network and improve Business experience.

Description of drawings

Fig. 1 is a schematic diagram of a reselection/handover method from a 2G network to a 3G network in the prior art;

FIG. 2 is a schematic flowchart of a method for selecting a service bearer network according to Embodiment 1 of the present invention;

FIG. 3 is a schematic structural diagram of a terminal according to Embodiment 1 of the present invention;

FIG. 4 is a schematic flowchart of a method for selecting a service bearer network according to Embodiment 2 of the present invention;

FIG. 5 is a schematic structural diagram of a terminal according to Embodiment 2 of the present invention;

FIG. 6 is a schematic flowchart of a method for selecting a service bearer network according to Embodiment 3 of the present invention;

FIG. 7 is a schematic structural diagram of a terminal according to Embodiment 3 of the present invention.

Detailed ways

Usually, when the 3G network signal is good, the PS service can obtain better service quality in the 3G network than in the 2G network, and the system issued by the network side in the prior art performs cell reselection from the 2G network to the 3G network The absolute threshold value of inter-system reselection decision (that is, the absolute value of the signal level corresponding to the inter-system reselection decision threshold Tdd-offset), usually only guarantees that the terminal can obtain the service with the lowest quality guarantee after reselection/handover to the 3G network. Therefore, For the PS service, on the basis of the prior art, the present invention further presets a reselection threshold offset greater than 0 on the terminal side to increase the threshold for the terminal to switch from the 2G network to the 3G network, that is, in the 3G network When the signal is good, the PS service is preferentially carried on the 3G network, so that the network resources can be rationally used and the user's service quality can be improved.

The present invention will be further described through specific embodiments below in conjunction with the accompanying drawings.

<Example 1>

Referring to Figure 2, the method for selecting a service bearer network described in this embodiment includes:

Step 21, after the terminal is turned on, if it detects signals of both the 2G network and the 3G network, it initially resides in the 2G network.

In this embodiment, when the 2G network and the 3G network coexist, the terminal will preferentially reside in the 2G network after it is powered on. Choose to return to the 2G network. In this way, before initiating any service, the terminal resides in the 2G network.

Step 22, when the terminal residing in the 2G network detects that the user initiates a service, it judges the type of the service: if it is a CS service, proceed to step 23; if it is a PS service, proceed to step 24.

Step 23, the terminal executes the CS service in the 2G network, and ends this process after the execution is completed.

Step 24, the terminal judges whether the signal quality measurement value of the 3G network is greater than the sum of the reselection threshold offset preset on the terminal side and the absolute threshold value of the reselection judgment between the 2G network and the 3G network issued by the network side , the reselection threshold offset is a positive number: if yes, go to step 25, otherwise go to step 26.

Here, when detecting that the user initiates the PS service in the packet switching domain, the terminal judges whether the signal quality measurement value of the 3G network is greater than the sum value, and the sum value is greater than the intersystem reselection judgment from the 2G network to the 3G network issued by the network side The absolute threshold value, thereby increasing the threshold for the terminal to reselect to the 3G network, so that the terminal can obtain better service quality when reselecting to the 3G network.

The terminal can obtain the signal quality measurement value of the 3G network according to the measurement method of the prior art. For example, after the signal of the 2G serving cell where it is currently camping meets the start-up condition issued by the network side, it measures the signal measurement of the 3G neighboring cell. Get the signal quality of the 3G network. The terminal may also start to measure the signal of the 3G neighboring cell after entering step 24, so as to obtain the signal quality of the 3G network. If there are multiple 3G neighboring cells, in step 24, the signal quality measurement value of the 3G neighboring cell with the best signal is selected as the signal quality measurement value of the 3G network.

The reselection threshold offset is a positive number, and the specific value can usually be determined according to the specific network environment. For example, taking the signal level value (in dBm) as an example, the reselection threshold offset can be set to 3dBm, thereby increasing the threshold to the sum of the absolute threshold value of inter-system reselection decision and 3dBm, that is, requiring 3G When the network signal strength reaches twice the signal strength corresponding to the absolute threshold value of the inter-system reselection decision, the cell reselects to the 3G network.

Step 25, when the signal quality measurement value of the 3G network is greater than the above sum value, the terminal reselects to the 3G network by performing cell reselection, and executes the PS service in the 3G network, and ends this process after the execution is completed.

Here, compared with the 2G network, the 3G network is more suitable for the PS service. In this embodiment, when the 3G network signal is good, the terminal is reselected to the 3G network, and the PS service is executed in the 3G network, thereby making better use of the 3G network. Internet resources.

Step 26, when the signal quality measurement value of the 3G network is not greater than the above-mentioned sum value, the terminal executes the PS service in the 2G network, and ends this process after the execution is completed.

Here, when the 3G network signal is not good enough, this embodiment continues to execute the PS service in the 2G network, which can ensure better service quality for the PS service. In this embodiment, the 2G network may be a GSM network, the 3G network may be a TD-SCDMA network, a WCDMA network or a CDMA2000 network, and the corresponding 2G or 3G cell refers to a cell of the corresponding network.

In the above steps, the network that carries the service is selected according to the service type and the signal quality of the 3G network, and the threshold for cell reselection between different systems is increased, which reduces the probability of frequent reselection of different systems by the terminal, thereby improving the called rate of the terminal. The success rate is high, the power consumption of the terminal is saved, and the standby time of the terminal is prolonged. Moreover, this embodiment makes full use of the respective advantages of the existing 2G and 3G networks on the premise of ensuring a good service experience for users, realizes reasonable service distribution, and makes reasonable use of existing network resources. Since the threshold for cell reselection between different systems is increased, it can also reduce the call drop probability caused by switching between different systems during voice calls, further improving user experience.

Based on the above method, this embodiment also provides a terminal for implementing the above method. As shown in FIG. 3 , the terminal includes: a service detection unit, a first judgment unit, a cell reselection unit, a first service execution unit and The second business execution unit; wherein,

The service detection unit is used to detect the service initiated by the user when the terminal resides in the 2G network, and trigger the first judgment unit when it is detected that the service initiated by the user is a PS service in the packet switching domain;

The first judging unit is configured to judge whether the signal quality measurement value of the 3G network is greater than a preset reselection threshold offset and whether the intersystem reselection decision from the 2G network to the 3G network is absolute according to the triggering of the service detection unit The sum of threshold values, and when the signal quality measurement value of the 3G network is greater than the sum value, trigger the cell reselection unit; when the signal quality measurement value of the 3G network is not greater than the sum value , triggering the second service execution unit;

The cell reselection unit is configured to reselect the terminal to a 3G network by performing cell reselection according to the trigger of the first judging unit;

The first service execution unit is configured to execute the PS service in the 3G network after the terminal reselects to the 3G network.

The second service executing unit is configured to execute the PS service in the 2G network according to the trigger of the first judging unit.

Preferably, the above-mentioned terminal further includes: an initial camping unit, configured to initially camp in the 2G network if signals of both the 2G network and the 3G network are detected after the terminal is turned on.

<Example 2>

As shown in Figure 4, the method for selecting a service bearer network described in this embodiment specifically includes:

Step 31 , after the terminal is turned on, if it detects signals of both the 2G network and the 3G network, it initially resides in the 2G network.

Step 32, when the terminal residing in the 2G network detects that the user initiates a service, it judges the type of the service: if it is a CS service, proceed to step 33; if it is a PS service, proceed to step 34.

Step 33, the terminal executes the CS service in the 2G network, and ends this process after the execution is completed.

Step 34, the terminal judges whether the signal quality measurement value of the 3G network is greater than the sum of the reselection threshold offset preset on the terminal side and the absolute threshold value of the reselection judgment between the 2G network and the 3G network issued by the network side , the reselection threshold offset is a positive number: if yes, go to step 35, otherwise go to step 36.

Step 35, when the signal quality measurement value of the 3G network is greater than the above sum value, the terminal reselects to the 3G network by performing cell reselection, and executes the PS service in the 3G network, and ends this process after the execution is completed.

The above steps 31 to 35 are respectively the same as steps 21 to 25 of Embodiment 1.

Step 36, when the signal quality measurement value of the 3G network is not greater than the above-mentioned sum value, the terminal judges whether the signal quality measurement value of the 3G network is greater than the absolute threshold value of the inter-system reselection decision: if yes, enter step 37 , otherwise go to step 38;

Step 37, when the signal quality measurement value of the 3G network is greater than the absolute threshold value of the inter-system reselection decision, it indicates that the signal quality of the 3G network is average, and the 3G network can also provide the service with the lowest quality guarantee at this time. The terminal performs cell reselection, reselects to the 3G network, and executes the PS service in the 3G network, and ends this process after the execution is completed.

Step 38, when the signal quality measurement value of the 3G network is not greater than the absolute threshold value of the inter-system reselection decision, it means that the signal quality of the 3G network is poor, and at this time directly execute the PS service in the 2G network, and End this process after execution is complete.

In the above steps 36-38, when the 3G network signal is normal, the terminal side directly reselects to the 3G network to perform PS services, and does not perform reselection when the 3G network signal quality is not good, and executes it on the 2G network. The PS service uses the current 2G bandwidth to serve users, which not only makes full use of the 2G bandwidth, but also avoids the impact on the 3G network caused by high-power transmission after the terminal reselects to the 3G network.

Based on the above method, this embodiment also provides a terminal for implementing the above method. As shown in FIG. 5, the terminal includes: a service detection unit, a first judgment unit, a second judgment unit, a cell reselection unit, a second A business execution unit and a second business execution unit; wherein,

The service detection unit is used to detect the service initiated by the user when the terminal resides in the 2G network, and trigger the first judgment unit when it is detected that the service initiated by the user is a PS service in the packet switching domain;

The first judging unit is configured to judge whether the signal quality measurement value of the 3G network is greater than a preset reselection threshold offset and whether the intersystem reselection decision from the 2G network to the 3G network is absolute according to the triggering of the service detection unit The sum of threshold values, and when the signal quality measurement value of the 3G network is greater than the sum value, trigger the cell reselection unit; when the signal quality measurement value of the 3G network is not greater than the sum value , triggering the second judging unit;

The second judging unit is configured to judge whether the signal quality measurement value of the 3G network is greater than the absolute threshold value of the inter-system reselection judgment according to the triggering of the first judging unit: if so, trigger the cell A reselection unit; otherwise, trigger the second service execution unit;

The cell reselection unit is configured to reselect the terminal to a 3G network by performing cell reselection according to the trigger of the first judging unit or the second judging unit;

The first service execution unit is configured to execute the PS service in the 3G network after the terminal reselects to the 3G network.

The second service executing unit is configured to execute the PS service in the 2G network according to the trigger of the second judging unit.

Preferably, the cell reselection unit is further configured to camp the terminal on a 2G network by performing cell reselection after the first service execution unit executes the PS service in the 3G network.

Preferably, the service detection unit is further configured to trigger the second service execution unit when detecting that the service initiated by the user is a CS service in the circuit switched domain;

The second service execution unit is further configured to execute the CS service in the 2G network according to the trigger of the service detection unit.

Preferably, the above-mentioned terminal also includes:

The initial resident unit is configured to initially resident in the 2G network if the signals of the 2G network and the 3G network are detected at the same time after the terminal is turned on.

<Example 3>

Considering that the data volume of the PS service initiated by the user can be large or small, and the conversion range is large. For example, when the user just sends a multimedia message or browses a simple web page, the data flow of the PS service is usually around tens of KB; When the PS service initiated by the user is to watch a long-time video stream, the service volume will be very large at this time, reaching tens or hundreds of MB. The 3G network is more suitable for carrying PS services with a large amount of data. Therefore, in this embodiment, after judging that the signal quality measurement value of the 3G network is not greater than the absolute threshold value of the inter-system reselection decision, it can further be based on the determined The execution time of the PS service in the 2G network is used to determine whether to reselect to the 3G network.

As shown in Figure 6, the method for selecting a service bearer network described in this embodiment specifically includes:

In step 401, after the terminal is turned on, if it detects signals of both the 2G network and the 3G network, it initially resides in the 2G network.

Step 402, when the terminal residing in the 2G network detects that the user initiates a service, it judges the type of the service: if it is a CS service, go to step 403; if it is a PS service, go to step 404.

Step 403, the terminal executes the CS service in the 2G network, and ends this process after the execution is completed.

Step 404, the terminal judges whether the signal quality measurement value of the 3G network is greater than the sum of the reselection threshold offset preset on the terminal side and the absolute threshold value of the reselection judgment between the 2G network and the 3G network issued by the network side , the reselection threshold offset is a positive number: if yes, go to step 405 , otherwise go to step 406 .

Step 405, when the signal quality measurement value of the 3G network is greater than the above-mentioned sum value, the terminal reselects to the 3G network by performing cell reselection, and executes the PS service in the 3G network, and ends this process after the execution is completed.

Step 406, when the signal quality measurement value of the 3G network is not greater than the above sum value, the terminal judges whether the signal quality measurement value of the 3G network is greater than the absolute threshold value of the inter-system reselection decision: if yes, enter step 407 , otherwise go to step 408;

Step 408, when the signal quality measurement value of the 3G network is not greater than the absolute threshold value of the inter-system reselection decision, it means that the signal quality of the 3G network is poor, and at this time directly execute the PS service in the 2G network, and End this process after execution is complete.

The above steps 401-406, 408 are respectively the same as the steps 31-36, 38 of Embodiment 2.

Step 407, when the signal quality measurement value of the 3G network is greater than the absolute threshold value of the inter-system reselection decision, it indicates that the signal quality of the 3G network is average, and at this time the terminal executes the PS service, and start a timer (the timing value is T) to judge whether the PS service has been executed within the predetermined time T: if yes, enter step 409; otherwise, enter step 410.

Step 409, if the PS service has been executed before the above-mentioned timer reaches the predetermined time T, then end this procedure.

Step 410, if the execution of the PS service has not been completed after the above-mentioned timer reaches the predetermined time T, stop executing the PS service in the 2G network at this time, and reselect to the 3G network by performing cell reselection. The PS service is executed in the 3G network, and this process ends after the execution is completed.

Here, the PS service with a small amount of data, such as simple MMS and Web service browsing, usually takes about 5-6 seconds to complete in the 2G network. Reselecting to execute the PS service in the 3G network will greatly prolong the execution waiting time of the service, which seriously affects the user experience. Therefore, in this embodiment, when the 3G network signal is normal, the PS service is first executed in the 2G network , and judge whether the PS service can be completed within the predetermined time. If the execution is completed, the process can be ended directly; if it is not completed, it means that the PS service may be a service with a large amount of data, so it is best to reselect It is more suitable for implementing PS services in 3G networks to obtain better services. When the amount of data is large, the duration of the PS service usually reaches tens of minutes or even hours. At this time, the 6-8 seconds required for the reselection operation of different systems is very short compared with the duration of the service, so it is not serious affect the user experience.

In the above steps 407, 409-410, when the signal quality of the 3G network is average, the terminal side further performs reselection based on the predetermined time T set by the terminal, so that the PS service with a small amount of data is directly completed in the 2G network, Reselection is no longer performed on the 3G network to save the time occupied by reselection between different systems; for PS services with a large amount of data, reselection is performed on the 3G network to make full use of the higher data provided by the 3G network The advantage of service carrying capacity improves the experience of service use.

In addition, in this embodiment, in all the above steps, after the execution of the PS service is completed, if the terminal camps on the 3G network, it further executes cell reselection to camp on the 2G network.

Based on the above method, this embodiment also provides a terminal for implementing the above method. As shown in FIG. 7, the terminal includes: a service detection unit, a first judgment unit, a second judgment unit, a third judgment unit, a cell A reselection unit, a first service execution unit, and a second service execution unit; wherein,

The service detection unit is used to detect the service initiated by the user when the terminal resides in the 2G network, and trigger the first judgment unit when it is detected that the service initiated by the user is a PS service in the packet switching domain;

The first judging unit is configured to judge whether the signal quality measurement value of the 3G network is greater than a preset reselection threshold offset and whether the intersystem reselection decision from the 2G network to the 3G network is absolute according to the triggering of the service detection unit The sum of threshold values, and when the signal quality measurement value of the 3G network is greater than the sum value, trigger the cell reselection unit; when the signal quality measurement value of the 3G network is not greater than the sum value , triggering the second judging unit;

The second judging unit is configured to judge whether the signal quality measurement value of the 3G network is greater than the absolute threshold value of the inter-system reselection judgment according to the triggering of the first judging unit: if so, trigger the second judging unit Three judging units and the second business judging unit; otherwise, trigger the second business executing unit;

The second service executing unit is configured to execute the PS service in the 2G network according to the trigger of the second judging unit;

The third judging unit is configured to judge whether the second service execution unit has finished executing the PS service within a predetermined time according to the trigger of the second judging unit: if yes, do not perform any action and end the operation ; Otherwise, control the second service execution unit to stop executing the PS service, and trigger the cell reselection unit;

The cell reselection unit is configured to reselect the terminal to a 3G network by performing cell reselection according to the trigger of the first judging unit or the third judging unit;

The first service execution unit is configured to execute the PS service in the 3G network after the terminal reselects to the 3G network.

Preferably, in this embodiment, the cell reselection unit is further configured to camp the terminal on to the 2G network.

Preferably, the above-mentioned terminal also includes:

The initial resident unit is configured to initially resident in the 2G network if the signals of the 2G network and the 3G network are detected at the same time after the terminal is turned on.

To sum up, the method and terminal for selecting a service bearer network provided by the embodiments of the present invention can rationally utilize existing network resources and improve user service satisfaction.

The above is only the embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be regarded as Be the protection scope of the present invention.

Claims (10)

1. A method for selecting a service bearer network, comprising: When a terminal residing in the 2G network detects that the user initiates a PS service in the packet switching domain, it judges whether the signal quality measurement value of the 3G network is greater than a preset reselection threshold offset and the intersystem reselection from the 2G network to the 3G network. The sum of the absolute threshold values for selection decisions, wherein the reselection threshold offset is a positive number; When the signal quality measurement value of the 3G network is greater than the sum value, the terminal reselects to the 3G network by performing cell reselection, and executes the PS service in the 3G network; When the signal quality measurement value of the 3G network is not greater than the sum value, the terminal judges whether the signal quality measurement value of the 3G network is greater than the inter-system reselection decision absolute threshold: If so, by performing cell reselection, reselect to the 3G network, and execute the PS service in the 3G network; Otherwise, execute the PS service in the 2G network. 2. The method of claim 1, further comprising: After the terminal is turned on, if it detects the signals of the 2G network and the 3G network at the same time, it initially resides in the 2G network. 3. A method for selecting a service bearer network, comprising: When a terminal residing in the 2G network detects that the user initiates a PS service in the packet switching domain, it judges whether the signal quality measurement value of the 3G network is greater than a preset reselection threshold offset and the intersystem reselection from the 2G network to the 3G network. The sum of the absolute threshold values for selection decisions, wherein the reselection threshold offset is a positive number; When the signal quality measurement value of the 3G network is greater than the sum value, the terminal reselects to the 3G network by performing cell reselection, and executes the PS service in the 3G network; When the signal quality measurement value of the 3G network is not greater than the sum value, the terminal judges whether the signal quality measurement value of the 3G network is greater than the inter-system reselection decision absolute threshold: If so, execute the PS service in the 2G network, and further judge whether the PS service is executed within a predetermined time: if the execution is completed, this process is ended; if the execution is not completed, stop in the 2G network Execute the PS service, and reselect to the 3G network by performing cell reselection, and execute the PS service in the 3G network; Otherwise, execute the PS service in the 2G network. 4. The method of claim 3, further comprising: After executing the PS service in the 3G network, the terminal further performs cell reselection to camp on the 2G network. 5. The method of claim 4, further comprising: The terminal executes the CS service in the 2G network when detecting that the user initiates the CS service in the circuit switched domain. 6. A terminal, characterized by comprising: a service detection unit, a first judgment unit, a cell reselection unit, and a first service execution unit; wherein, The service detection unit is used to detect the service initiated by the user when the terminal resides in the 2G network, and trigger the first judgment unit when it is detected that the service initiated by the user is a PS service in the packet switching domain; The first judging unit is configured to judge whether the signal quality measurement value of the 3G network is greater than a preset reselection threshold offset and whether the intersystem reselection judgment from the 2G network to the 3G network is absolute according to the triggering of the service detection unit The sum value of the threshold value, and when the signal quality measurement value of the 3G network is greater than the sum value, trigger the cell reselection unit; The cell reselection unit is configured to reselect the terminal to a 3G network by performing cell reselection according to the trigger of the first judging unit; The first service execution unit is configured to execute the PS service in the 3G network after the terminal reselects to the 3G network; In addition, the terminal further includes a second judgment unit and a second service execution unit; The first judging unit is further configured to trigger the second judging unit when the signal quality measurement value of the 3G network is not greater than the sum value; The second judging unit is configured to judge whether the signal quality measurement value of the 3G network is greater than the absolute threshold value of the inter-system reselection judgment according to the triggering of the first judging unit: if so, trigger the cell A reselection unit; otherwise, trigger the second service execution unit; The cell reselection unit is further configured to reselect the terminal to a 3G network by performing cell reselection according to the trigger of the second judging unit; The second service executing unit is configured to execute the PS service in the 2G network according to the trigger of the second judging unit. 7. The terminal according to claim 6, further comprising: The initial resident unit is configured to initially resident in the 2G network if the signals of the 2G network and the 3G network are detected at the same time after the terminal is turned on. 8. A terminal, characterized by comprising: a service detection unit, a first judgment unit, a cell reselection unit, and a first service execution unit; wherein, The service detection unit is used to detect the service initiated by the user when the terminal resides in the 2G network, and trigger the first judgment unit when it is detected that the service initiated by the user is a PS service in the packet switching domain; The first judging unit is configured to judge whether the signal quality measurement value of the 3G network is greater than a preset reselection threshold offset and whether the intersystem reselection decision from the 2G network to the 3G network is absolute according to the triggering of the service detection unit The sum value of the threshold value, and when the signal quality measurement value of the 3G network is greater than the sum value, trigger the cell reselection unit; The cell reselection unit is configured to reselect the terminal to a 3G network by performing cell reselection according to the trigger of the first judging unit; The first service execution unit is configured to execute the PS service in the 3G network after the terminal reselects to the 3G network; Wherein the terminal further includes a second judging unit, a second service execution unit and a third judging unit; The first judging unit is further configured to trigger the second judging unit when the signal quality measurement value of the 3G network is not greater than the sum value; The second judging unit is configured to judge whether the signal quality measurement value of the 3G network is greater than the absolute threshold value of the inter-system reselection judgment according to the triggering of the first judging unit: if so, trigger the second judging unit Three judging units and the second business judging unit; otherwise, trigger the second business executing unit; The second service executing unit is configured to execute the PS service in the 2G network according to the trigger of the second judging unit; The third judging unit is configured to judge whether the second service executing unit has finished executing the PS service within a predetermined time according to the trigger of the second judging unit: if yes, end the operation; otherwise, control the The second service execution unit stops executing the PS service, and triggers the cell reselection unit; The cell reselection unit is further configured to reselect the terminal to a 3G network by performing cell reselection according to the trigger of the third judging unit. 9. The terminal according to claim 8, characterized in that, The cell reselection unit is further configured to camp the terminal on a 2G network by performing cell reselection after the first service execution unit executes the PS service in the 3G network. 10. The terminal according to claim 9, characterized in that, The service detection unit is further configured to trigger the second service execution unit when detecting that the service initiated by the user is a CS service in the circuit switched domain; The second service execution unit is further configured to execute the CS service in the 2G network according to the trigger of the service detection unit.

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