WO2011140740A1

WO2011140740A1 - Method for dual-mode terminal selecting network and dual-mode terminal

Info

Publication number: WO2011140740A1
Application number: PCT/CN2010/075537
Authority: WO
Inventors: 尚鹏; 蔡显志; 雷波
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-05-10
Filing date: 2010-07-29
Publication date: 2011-11-17
Also published as: CN101820658A

Abstract

A method for dual-mode terminal selecting network and a dual-mode terminal are provided, which are used to solve the problem in the prior art that a user of a dual-mode terminal has a bad experience on the 3rd Generation (3G) network. The method includes: when a dual-mode terminal being turned on, searching 3G cells and determining whether there is a 3G cell satisfying the resident requirements; when there being a 3G cell satisfying the resident requirements, residing in the 3G cell satisfying the resident requirements; otherwise, searching the 2nd Generation (2G) cells and determining whether there is a 2G cell satisfying the resident requirements; and when there is a 2G cell satisfying the resident requirements, residing in the 2G cell satisfying the resident requirements. The 3G cells are searched firstly after the dual-mode terminal of the present invention is turned on, and when none of the 3G cells satisfies the resident requirements, 2G cells will be searched, thus improving the experience of the users of dual-mode terminals on 3G network as well as the utilization ratio of 3G network resources.

Description

TECHNICAL FIELD The present invention relates to the field of wireless mobile communication technologies, and in particular, to a network selection method for dual-mode terminals and a dual-mode terminal. BACKGROUND OF THE INVENTION For existing mobile communication systems, second generation mobile communication system (also known as 2G) networks (such as the Global System for Mobile Communications (GSM) network) have a wide coverage, but with the movement The rapid development of communication technology, Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) network and wideband code division multiple access system in the third generation mobile communication system (also known as 3G) network (Wide-band Code Division Multiple Access, WCDMA) The deployment of the network is also becoming more and more perfect. In order to make full use of network resources, single-mode terminals have also begun to develop into multi-mode terminals that support multiple wireless access capabilities. In a system environment where multiple wireless networks coexist, different wireless access technologies and different layout modes may have a greater impact on the end user. In the early stage of 3G network deployment, due to the instability of the 3G network and the immaturity of the layout, in order to prevent the 3G users from being in a position not covered by the 3G network, or the call drop phenomenon caused by the weak signal position, In the early stage of 3G network deployment, 2G networks are generally used for talking. Moreover, in the prior art, since the frequency band of the GSM1800 is similar to the frequency band of the TD-SCDMA, the terminal generally works on the GSM900 frequency band to reduce the number of thousands. Moreover, when the dual mode terminal camps on the GSM cell, the neighboring TD-SCDMA cell is no longer measured, and the nearby TD-SCDMA cell is initiated only when the surrounding GSM cell no longer satisfies the camping condition. Measurement. Since the dual-mode terminal in the prior art only searches for a 2G cell after booting, or preferentially selects a 2G cell, the implementation manner is suitable in the early stage of 3G network deployment, but now the 3G network has a certain scale, and when the dual-mode terminal is powered on, After the above method is used to find the 2G cell, the coverage of the 2G cell is very wide, and the dual mode terminal is difficult to reside in the 3G cell, thereby affecting the experience of the user of the dual mode terminal to the 3G network, and causing waste of 3G network resources. . SUMMARY OF THE INVENTION In view of this, an embodiment of the present invention provides a network selection method for a dual-mode terminal and a dual-mode terminal, which are used to solve the problem of causing waste of 3G network resources in the prior art. A network selection method for a dual mode terminal according to an embodiment of the present invention includes: searching for a 3G cell after the dual mode terminal is powered on; determining whether there is a 3G cell that satisfies the camping condition, and when there is a 3G cell that satisfies the camping condition, Residing in the 3G cell that satisfies the camping condition; otherwise, searching for the 2G cell, determining whether there is a 2G cell that satisfies the camping condition, and when there is a 2G cell satisfying the camping condition, camping on the satisfied camping condition 2G cell. A dual mode terminal provided by the embodiment of the present invention includes: a search module, configured to search for a 3G cell after searching, and search for a 2G cell; and determine, by the determining module, whether there is a 3G cell that satisfies the camping condition, and determine whether the content is satisfied. a camping 2G cell; a camping module, when there is a 3G cell that satisfies the camping condition, camping on the 3G cell that satisfies the camping condition, and determining to exist when there is a 2G cell that satisfies the camping condition, And the controlling module is configured to control the search module to search for the 2G cell when there is no 3G cell that satisfies the camping condition. The present invention provides a network selection method for a dual mode terminal and a dual mode terminal. When the dual mode terminal is powered on, the method searches for a 3G cell to determine whether there is a 3G cell that satisfies the camping condition, and when there is a camping condition. 3G cell, camping on the 3G cell that satisfies the camping condition, otherwise, searching for the 2G cell, determining whether there is a 2G cell that satisfies the camping condition, and when there is a 2G cell that satisfies the camping condition, staying in the A 2G cell that satisfies the camping condition. In the embodiment of the present invention, after the dual-mode terminal is powered on, the 3G cell is searched first, and when there is no 3G cell that satisfies the camping condition, the 2G cell is searched, thereby improving the experience of the user of the dual-mode terminal on the 3G network, and improving the 3G cell. Utilization of network resources. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart of a network selection process of a dual mode terminal according to Embodiment 1 of the present invention; FIG. 2 is a schematic diagram of a current dual mode terminal residing in a 3G cell according to Embodiment 2 of the present invention, for example, a dual mode terminal currently camped on FIG. 3 is a flowchart of a process in which a dual mode terminal performs network selection when staying in a first 3G cell; FIG. 3 is a current dual mode terminal that resides in a 3G cell according to Embodiment 2 of the present invention, for example, a dual mode terminal currently resides in the first FIG. 4 is a flowchart of another process for a dual mode terminal to perform network selection in a 3G cell; FIG. 4 is a dual mode terminal currently camped on a 2G cell according to Embodiment 3 of the present invention, for example, a dual mode terminal currently camps on a first 2G cell; A flowchart of a process for a dual mode terminal to perform network selection; FIG. 5 is a flowchart of another process of a dual mode terminal currently camping on a 2G cell and a dual mode terminal performing network selection according to Embodiment 3 of the present invention; A schematic structural diagram of a dual mode terminal provided in Embodiment 4 of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Embodiment 1 In this embodiment, in order to improve the experience of the dual-mode terminal on the 3G network and improve the utilization of the 3G network resource, a network selection method for the dual-mode terminal is provided. When the dual-mode terminal is powered on, the 3G cell is preferred to be searched, and Residing in a 3G cell that satisfies the camping condition, when there is no 3G cell that satisfies the camping condition, the dual mode terminal searches for the 2G cell and camps on the 2G cell that satisfies the camping condition. Since the 3G cell is first searched in the embodiment of the present invention, it resides in the 3G cell that satisfies the camping condition, thereby improving the experience of the user of the dual mode terminal on the 3G network. The network selection method of the dual mode terminal of the embodiment will be described in detail below with reference to the accompanying drawings. FIG. 1 is a network selection process of a dual mode terminal according to Embodiment 1 of the present invention. The process includes the following steps: S101: After a dual mode terminal is powered on, search for a 3G cell. In this embodiment, the 3G cell may include: a TD-SCDMA cell and a WCDMA cell. The specific process of searching for the 3G cell includes: the dual mode terminal searches for the TD-SCDMA cell in the frequency band of 2010-2015 MHz; or, the dual mode terminal searches for the TD-SCDMA cell according to the locally saved cell information.

S102: The dual mode terminal determines whether there is a 3G cell that satisfies the camping condition. When there is a 3G cell that satisfies the camping condition, the dual mode terminal camps on the 3G cell that satisfies the camping condition.

S103: When there is no 3G cell that satisfies the camping condition, the dual mode terminal searches for a 2G cell to determine whether there is a 2G cell that satisfies the camping condition.

S104: When there is a 2G cell that satisfies the camping condition, camping on the 2G cell that satisfies the camping condition. When the dual-mode terminal is turned on, the public land mobile network (Public Land Mobile)

In the selection process of the network, the PLMN, in order to improve the experience of the dual-mode terminal user on the 3G network, in the embodiment, the 3G network priority is set, for example, the TD-SCDMA network priority is set, that is, the dual-mode terminal performs the network selection process. , first choose 3G network. When the dual mode terminal completes the selection of the PLMN, the cell search and selection is started. Since 1880-1900MHz has just been assigned to the TD-SCDMA network in the 3G network. Therefore, in order to avoid the influence of the imperfect construction of the TD-SCDMA network in the frequency band on the user's body-risk, in the present embodiment, the dual-mode terminal may perform only the process of the frequency sweep, and the dual-mode terminal may only be in the TD-SCDMA network. Each frequency point on the 2010-2015 MHz frequency band is searched one by one. The dual-mode terminal searches for the 3G cell with the strongest signal strength at each frequency point according to the power of the received signal. After determining the 3G cell with the strongest signal strength at each frequency point, the dual mode terminal obtains the power value information of each cell from the Primary Common Control Physical Channel (PCCPCH). In the case that the dual mode terminal locally saves information of some cells before the last shutdown, when the dual mode terminal is powered on again, the dual mode terminal may also search for information of the 3G cell according to the information of the saved cell, for example, searching for TD. - Information of the SCDMA cell. The power is measured according to the searched 3G cell, thereby obtaining power value information of each cell. When the obtained power value of each cell is lower than the set power threshold, or each cell does not meet the camping condition, the dual mode terminal will perform the frequency sweep again, which may be in the TD-SCDMA network in 2010~2015 MHz. Each frequency point on the frequency band is searched one by one. The dual mode terminal searches for the cell with the strongest signal strength at each frequency point according to the power of the received signal. The power value information of each cell is obtained from the PCCPCH. The dual-mode terminal acquires complete system information of the cell on the PCCPCH according to the high-level planning information, according to the obtained power value information of each cell, according to the information of the access layer and the non-access stratum in the system information. , determine if the cell meets the resident condition. The satisfaction of the camping condition in this embodiment includes the cell signal strength being higher than the set intensity threshold. When there is a 3G cell that satisfies the camping condition, the dual mode terminal will camp on the 3G cell and receive broadcast and system information from the 3G cell, thereby completing the cell selection process. When there is no 3G cell that satisfies the camping condition, the dual mode terminal starts searching for the 2G cell, for example, searching for the GSM cell, searching on the radio frequency (RF), and reading the signal received on the RF. strength. Based on the intensity of the read signal, the average level is calculated and the average level is modulated onto the carrier corresponding to the maximum received level. Determining whether the corresponding carrier is a Broadcast Control Channel (BCCH) carrier. When the corresponding carrier is a BCCH carrier, the Synchronization Channel (SCH) synchronizes and acquires a system message on the BCCH carrier. Determining, according to the obtained system message, whether there is a 2G cell that can camp on. When there is a 2G cell that can camp, the dual mode terminal camps on the 2G cell, receives broadcast and system messages from the 2G cell, and completes the cell. The selection process. In the present embodiment, when there is no 3G cell that satisfies the camping condition at the location where the dual mode terminal is located, and there is no 2G cell that satisfies the camping condition, the dual mode terminal may output the prompt information that the network is not found to the user. Since the 3G network has been deployed very maturely, and the 3G network can provide more services for the user, thereby improving the user experience, the cell selection process performed after the dual mode terminal provided in this embodiment is powered on, the dual mode terminal First, a 3G cell search is performed to determine whether there is a 3G cell that satisfies the camping condition. When there is no 3G cell that satisfies the camping condition, the dual mode terminal performs a 2G cell search to determine whether there is a 2G that satisfies the camping condition. Community. In this embodiment, since the frequency band of 1880 to 1900 MHz in the TD-SCDMA network has just been allocated, the network construction is not perfect, and the problem of excessive failure rate caused by the dual-mode terminal performing cell search in the frequency band is In the embodiment, the dual mode terminal can preferentially or only search the 2010~2015 MHz frequency band to speed up the process of cell selection. In this embodiment, when the dual mode terminal camps on the corresponding 3G cell or the 2G cell, when the neighboring cell is measured in the idle mode, in order to facilitate the dual mode terminal to select a cell more suitable for camping, Improve the experience of users of dual-mode terminals on 3G networks and improve the utilization of 3G network resources. In this embodiment, for the 3G cell or the 2G cell where the dual-mode terminal currently camps, different network selection methods are used. Embodiment 2 FIG. 2 is a process for a dual-mode terminal to perform network selection when a current dual-mode terminal resides in a 3G cell according to Embodiment 2 of the present invention. For example, when a dual-mode terminal currently resides in a first 3G cell, the process includes the following steps. Step 4:

S201: The dual mode terminal acquires information about a 3G cell adjacent to the location of the dual mode terminal. In this embodiment, the dual mode terminal acquires information about the 3G cell adjacent to the location of the dual mode terminal according to the received system message sent by the first 3G cell.

S202: The dual-mode terminal acquires information about a neighboring 3G cell in the location, and performs measurement on a neighboring 3G cell in the location.

S203: Determine, according to the measurement of the neighboring 3G cell, whether there is a second 3G cell that satisfies the camping condition and is better than the first 3G cell that the dual mode terminal currently camps on, when it is determined to exist At the same time, step 4 is performed to gather S204, otherwise, step 4 is performed to gather S205.

S204: The dual mode terminal selects to camp on the second 3G cell, and receives broadcast and system messages from the second 3G cell, thereby completing a cell selection process.

S205: The dual mode terminal continues to camp on the currently camped first 3G cell. When the dual mode terminal is currently camped on the 3G cell, the dual mode terminal performs measurement in the idle mode. When the dual mode terminal performs measurement, the 3G cell adjacent to the location is measured to determine whether there is a currently camped 3G cell. In the case of the 3G cell with good condition, in order to improve the quality of the dual-mode terminal, in the present embodiment, the dual-mode terminal can camp on the 3G cell with good condition and receive the 3G cell with good condition. service. The dual mode terminal may continue to camp on the currently camped 3G cell when not present. In the foregoing embodiment, when the dual-mode terminal performs neighbor cell measurement in the idle mode, in order to facilitate the dual-mode terminal to select a cell that is more suitable for camping, the user of the dual-mode terminal is improved in the experience of the 3G network, and the utilization of the 3G network resource is improved. And reduce the resource consumption of the dual mode terminal. In this embodiment, the dual mode terminal first measures the neighboring 3G cell, when there is a currently camped 3G cell. When the 3G cell is in good condition, it camps on the 3G cell with good condition, thereby improving the utilization of the 3G network resource, and since the dual-mode terminal is performing measurement, there is no need to perform a system with large resources for the dual-mode terminal. The measurement is performed only within the system, thereby reducing the resource consumption of the dual-mode terminal and improving the standby time of the dual-mode terminal. If the currently camped 3G cell does not meet the camping condition, and the dual-mode terminal obtains the information of the 3G cell that is adjacent to the location, the measurement is performed, and the result of the measurement is also determined that there is no 3G that resides in the current dual-mode terminal. In the case of a 3G cell with good cell conditions, in order to improve the quality of service provided for the dual mode terminal, in this embodiment, the dual mode terminal can also perform measurement of the 2G cell, thereby improving the quality of service on the network side. FIG. 3 is another process of the dual mode terminal performing network selection when the current dual mode terminal resides in the 3G cell according to the second embodiment of the present invention. For example, when the dual mode terminal currently resides in the first 3G cell, the process includes the following steps. 4 poly:

S301: The dual mode terminal acquires information about a 3G cell adjacent to the location of the dual mode terminal. In this embodiment, the dual mode terminal acquires information about the 3G cell adjacent to the location of the dual mode terminal according to the received system message sent by the first 3G cell. And at this time, the first 3G cell currently camped on by the dual mode terminal has not satisfied the camping condition.

S302: The dual-mode terminal acquires information about the neighboring 3G cell in the location, and measures the neighboring 3G cell in the location.

S303: Determine, according to the measurement of the neighboring 3G cell, whether there is a second 3G cell that satisfies the camping condition and is better than the first 3G cell that the dual mode terminal currently camps on, when it is determined to exist At step S304, otherwise, step S305 is performed.

S304: The dual mode terminal selects to camp on the second 3G cell, and receives broadcast and system messages from the second 3G cell, thereby completing a cell selection process.

S305: The dual mode terminal acquires information about a 2G cell adjacent to the location of the dual mode terminal. In this embodiment, the dual mode terminal obtains the information of the 2G cell adjacent to the location of the dual mode terminal according to the received system message sent by the first 3G cell.

S306: The dual-mode terminal obtains information about the neighboring 2G cell in the location, and performs measurement on each 2G cell. S307: According to the measurement of the neighboring 2G cell of the location, determining whether there is a 2G cell that satisfies the camping condition and is better than the first 3G cell that the dual mode terminal currently camps on, when it is determined to exist, Step S308 is performed, otherwise, step S309 is performed.

S308: The dual mode terminal selects to camp on the 2G cell, and receives broadcast and system messages from the 2G cell, thereby completing a cell selection process.

S309: The dual mode terminal continues to camp on the first 3G cell. In the above embodiment, when the 3G cell currently camped on by the dual mode terminal does not meet the camping condition, and according to the measurement result of measuring the neighboring 3G cell, it is determined that there is no better condition than the currently camped 3G cell. In the 3G cell, in order to improve the quality of the monthly service on the network side, the dual-mode terminal can obtain the information of the 2G cell adjacent to its location, and perform measurement to determine whether there is a 2G cell with better conditions than the currently camped 3G cell. When present, it can reside in a 2G cell with good conditions. The two processes of performing network selection by the dual mode terminal in the case where the current dual mode terminal resides in the 3G cell are described in detail based on the above. For example, in the embodiment, when the first 3G cell currently camped by the dual mode terminal is the first TD-SCDMA cell, the following uses the 3G network as the TD-SCDMA network, and the 2G network uses the GSM network as an example to describe the WCDMA network and The implementation of the TD-SCDMA network is basically the same. The first TD-SCDMA cell sends system information to the dual mode terminal, where the system information includes SIB3 information and SIB 11 information. The dual-mode terminal is located in the SIB3 information sent by the first TD-SCDMA cell, acquires information about the TD-SCDMA cell adjacent to the location of the dual-mode terminal, and acquires the location of the dual-mode terminal according to the SIB11 information sent by the first TD-SCDMA cell. Information about neighboring GSM cells. In the 10th Generation Partnership Project (3GPP), it is stipulated that when Srxlev <= SsearchRAT, dual-mode terminals need to perform inter-system measurement, and inter-system measurement may cause time comparison. It is a waste. If the physical layer measures the GSM cell adjacent to the dual-mode terminal location, it may consume more battery power, thus affecting the standby time of the dual-mode terminal. Therefore, in order to shorten the time for the dual-mode terminal to perform inter-system measurement and reduce the use of the dual-mode terminal battery power, in this embodiment, the dual-mode terminal may not measure the GSM cell adjacent to its location, but first measure its proximity to the location. TD-SCDMA cell. When the dual-mode terminal measures the TD-SCDMA cell adjacent to its location, the radio resource control (RRC) of the dual-mode terminal will only measure the task of the TD-SCDMA cell adjacent to the location of the dual-mode terminal and send it to the physics. Layer, and send cell list information to the physical layer, The cell list information includes frequency point information, SYNchronous Communication downlink (SYNC DL) information, and basic training sequence (Miniamble) information of the first TD-SCDMA cell currently camped on by the dual mode terminal. For each TD-SCDMA cell to be measured adjacent to the dual mode terminal location, the physical layer obtains synchronization with the TD-SCDMA cell according to the cell list information sent by the RRC. In order to speed up the time for the dual mode terminal to perform cell selection, in this embodiment, when the physical layer performs measurement on the TD-SCDMA cell, the timer can be simultaneously started, and each TD-SCDMA is within the time length of the timer. The cell performs measurements. Of course, in this embodiment, in order to further improve the utilization of the 3G network resources, the timer may not be used, so that the dual-mode terminal has sufficient time to measure the TD-SCDMA cell in the vicinity of the location. During the timing length of the timer, the measurement process for each TD-SCDMA cell includes: after the dual mode terminal synchronizes with the currently camped first TD-SCDMA cell, the RRC receives the first TD-SCDMA. The system message of the cell, thereby acquiring the SYNC DL of the neighboring TD-SCDMA cell. The physical layer is located in each TD-SCDMA cell adjacent to its location acquired by the RRC

SYNC_DL, and processing according to the DwPTS information received by the dual mode terminal, to obtain the location of the DwPTS information of each TD-SCDMA cell adjacent to its location. And determining the TS0 location of each TD-SCDMA cell according to the location of the DwPTS information of each TD-SCDMA cell adjacent to its location, and then obtaining the Midamble information on the PCCPCH of each cell. The physical layer performs channel impulse response estimation on the obtained Midamble information on the PCCPCH of each cell and the basic Midamble information corresponding to each neighboring cell in advance. The time difference between the received signal code power (RSCP) and the system frame number on the PCCPCH of each neighboring TD-SCDMA cell is calculated according to the obtained channel impulse response of each neighboring TD-SCDMA cell. The physical layer reports the calculated time difference between the received signal code power and the system frame number on the PCCPCH of each adjacent TD-SCDMA cell to the dual mode terminal. The dual-mode terminal calculates the S value according to the 'j, the region selection criterion, and sorts according to the cell reselection R criterion. According to the sorted result, it is determined whether there is a better condition than the first TD-SCDMA cell currently camped on by the dual-mode terminal. Two TD-SCDMA cells. When there is a second TD-SCDMA cell with a good condition of the first TD-SCDMA cell currently camped on by the dual mode terminal, the dual mode terminal selects to camp on the second TD-SCDMA cell and receives System messages and broadcasts sent by the second TD-SCDMA cell. When the dual mode terminal does not find the second TD-SCDMA cell with the first TD-SCDMA cell condition that is currently camped on the dual mode terminal within the time length of the timer, or exceeds the timer time length of the timer When the second TD-SCDMA cell with the first TD-SCDMA cell condition that is currently camped on by the dual mode terminal is not found, the dual mode terminal determines that there is no first TD-SCDMA 'j, zone currently camped on. With the second TD-SCDMA cell in good condition, the dual mode terminal can continue to camp on the first TD-SCDMA cell. When the first TD-SCDMA cell currently camped on by the dual mode terminal does not satisfy the camping condition, and the dual mode terminal measures the TD-SCDMA cell adjacent to the location, it is determined that there is no first TD currently camped on by the dual mode terminal. - When the TD-SCDMA cell with good SCDMA cell condition, that is, the TD-SCDMA cell adjacent to the dual mode terminal location does not satisfy the camping condition, the dual mode terminal can initiate measurement of the GSM cell. The dual-mode terminal transmits the SIB11 information in the system information to the dual-mode terminal according to the first TD-SCDMA cell, and acquires the GSM cell information adjacent to the location of the dual-mode terminal. The RRC transmits information such as the frequency point of each GSM cell adjacent to the location, 4 U-code, and the like to the physical layer of the GSM, and the GSM physical layer performs measurement on the GSM cell. In order to speed up the efficiency of the 'j, zone selection, the dual mode terminal can use the timer policy. When the RRC transmits the frequency of each GSM cell in the vicinity of the location, the information of the 4th code to the GSM physical. At the time of the layer, the timing time length information of the timer is sent to the physical layer of the GSM, and the physical layer of the GSM is instructed to measure the neighboring GSM cell within the time length of the timer. The timing length of the timer may be an integer multiple of the measurement time of the GSM physical layer to a GSM cell.

The physical layer of the GSM sorts and reports the measured GSM 'J, the area according to the measurement result, and the dual-mode terminal judges whether there is a first camper than the dual-mode terminal according to the ranking result of the GSM physical layer. A GSM cell with good TD-SCDMA cell condition, when there is a GSM cell, the dual mode terminal chooses to camp on the GSM cell, and receives the system message and broadcast sent by the GSM cell, when there is no current camping mode of the dual mode terminal When a TD-SCDMA cell has a good GSM cell, the dual mode terminal continues to camp on the first TD-SCDMA cell. In the present embodiment, there is no GSM cell with a good condition of the first TD-SCDMA cell currently camped on by the dual mode terminal, and the current dual mode terminal does not exist in the time length of the timer. The first TD-SCDMA 'j, the GSM cell with good condition, or the timeout period of the timer expires, and there is no GSM cell with good condition of the first TD-SCDMA cell currently camped on by the dual mode terminal. When the dual-mode terminal determines that there is no GSM cell with a good condition of the first TD-SCDMA cell currently camped on by the dual-mode terminal, in this embodiment, the timer time length of the timer may be extended, and the TD-continue selection is continued. The SCDMA cell selects the GSM cell mode, selects whether there is a cell that satisfies the camping condition, and the camping condition is better than the current first TD-SCDMA cell condition, or can directly close the timer, and continues to select TD-SCDMA according to the first choice. The cell selects a GSM cell mode to select whether there is a cell that satisfies the camping condition and has a better camping condition than the current first TD-SCDMA cell condition. In the above embodiment, when the dual mode terminal currently resides in the 3G cell, when inter-system measurement is performed in the idle mode, in order to reduce the time for the inter-system measurement of the dual-mode terminal, and subtract, j, the dual-mode terminal Power consumption, first measure the 3G cell adjacent to the location of the dual mode terminal. When there is no other 3G cell that is better than the currently camped 3G cell condition, the measurement of the GSM cell is performed, and according to the measurement result, it is determined whether to camp. Stay in the GSM community. Therefore, the above embodiment can effectively reduce the time for the dual mode terminal to perform intersystem measurement and prolong the standby time of the dual mode terminal. Embodiment 3 FIG. 4 is a process in which a dual mode terminal currently resides in a 2G cell according to Embodiment 3 of the present invention, for example, a dual mode terminal currently camps on a first 2G cell, and a dual mode terminal performs network selection, and the process includes the following steps. 4 poly:

S401: The dual-mode terminal acquires information about a 3G cell adjacent to the dual-mode terminal location, and performs measurement on the neighboring 3G cell according to the acquired information of the 3G cell. The dual-mode terminal obtains the information of the 3G cell adjacent to its location according to the system message sent by the network side. S402: The dual-mode terminal determines, according to the result of the measurement, whether there is a 3G cell that is better than the first 2G cell condition currently camped on by the dual-mode terminal. If the determination result is that the process exists, the process proceeds to step S303. Otherwise, step S404 is performed.

S403: The dual mode terminal selects to camp on the 3G cell, and receives system information and broadcast sent by the 3G cell. S404: The dual-mode terminal acquires information about a 2G cell adjacent to the location, and performs measurement on the neighboring 2G cell according to the acquired 2G cell information. The dual mode terminal acquires 2G cell information adjacent to the location of the dual mode terminal according to the system message sent by the network side. S405: The dual-mode terminal determines, according to the measurement result, whether there is a second 2G cell that is better than the first 2G cell condition currently camped on by the dual-mode terminal. If the determination result is the presence, the process proceeds to step S406. Otherwise, the process proceeds to step S407.

S406: The dual mode terminal selects to camp on the second 2G cell, and receives system information and broadcast sent by the second 2G cell. S407: The dual mode terminal continues to camp on the first 2G cell. In this embodiment, in order to effectively improve the utilization of the 3G network resources, when the dual mode terminal currently camps on the 2G cell, when performing measurement in the idle mode, the 3G cell adjacent to the location may be first measured to determine whether there is a current current. A 2G cell with good 2G cell conditions in which the dual mode terminal resides. When there is a good 3G cell, the dual mode terminal can camp on the 3G cell. When there is no 3G cell with good condition, the network side is improved. The quality of service can be measured by the 2G cell, and it is determined whether there is a 2G cell that is better than the currently camped 2G cell condition, and it is determined according to the result of the judgment whether to continue to camp on the currently camped 2G cell. In the embodiment, when the dual mode terminal currently resides in the 2G cell, the dual mode terminal performs another process of network selection, and the process may be performed according to the process shown in FIG. 5, the process comprising the following steps: S501: The dual mode terminal acquires information of the 2G cell adjacent to the location of the dual mode terminal, and performs measurement on the neighboring 2G cell according to the acquired information of the 2G cell. The dual mode terminal acquires 2G cell information adjacent to the location of the dual mode terminal according to the system message sent by the network side.

S502: The dual-mode terminal determines, according to the result of the measurement, whether there is a second 2G cell that is better than the first 2G cell condition currently camped on by the dual-mode terminal. When the determination result is that the process is performed, step S503 is performed; otherwise, step S504 is performed. .

S503: The dual mode terminal selects to camp on the second 2G cell, and receives system information and broadcast sent by the second 2G cell. S504: The dual-mode terminal acquires information about a 3G cell adjacent to the location, and performs measurement on the neighboring 3G cell according to the acquired 3G cell information. The dual-mode terminal obtains the information of the 3G cell adjacent to its location according to the system message sent by the network side. S505: The dual-mode terminal determines, according to the measurement result, whether there is a 3G cell that is better than the first 2G cell condition currently camped on by the dual-mode terminal. If the determination result is that the process exists, step S506 is performed; otherwise, step S507 is performed.

S506: The dual mode terminal selects to camp on the 3G cell, and receives system information and broadcast sent by the 3G cell. S507: The dual mode terminal continues to camp on the first 2G cell. In this embodiment, when the dual mode terminal camps on the 2G cell, the network side notifies the dual mode terminal of the information of the 2G cell adjacent to the dual mode terminal location, and the system information includes the SI2 information. When a 3G cell is deployed around the dual mode terminal, the network side also informs the dual mode terminal of the information of the 3G cell adjacent to the dual mode terminal location by using a system message, for example, the network side can use the SI2quater system message to locate the neighboring TD. The information of the -SCDMA cell is sent to the dual mode terminal. According to the requirements of the protocol, when the average signal strength of the 2G cell currently camped on by the dual mode terminal is less than Qsearch l, the dual mode terminal needs to perform intersystem measurement. Since the measurement between systems may cause a large waste of time, if the physical layer measures the 3G cell adjacent to the dual mode terminal location, it may consume more battery power, thereby affecting the standby time of the dual mode terminal. Therefore, in order to shorten the time for performing inter-system measurement and reduce the use of the dual-mode terminal battery power, in this embodiment, the dual-mode terminal may not measure the 3G cell adjacent to its location, but first measure the 2G cell adjacent to its location. . In the following, the dual-mode terminal currently resides in the first GSM cell, and the 3G cell uses TD-SCDMA 'J, the area as an example for description. And the specific implementation process is performed by taking the measurement of the TD-SCDMA cell by the dual-mode terminal first, and then performing the measurement of the GSM cell as an example. When the dual-mode terminal performs the measurement of the GSM cell first, the measurement of the TD-SCDMA cell is performed. The process is similar to the following process, and is not described here. It is believed that the skilled person can implement the specific embodiments provided in this embodiment. Dual-mode terminal-based information obtained from a TD-SCDMA cell adjacent to its location For the task of its neighboring TD-SCDMA cell, the RRC transmits the information of the TD-SCDMA cell adjacent to the dual mode terminal location to the physical layer of the TD-SCDMA, indicating that the physical layer of the TD-SCDMA is adjacent to the location of the TD-SCDMA. The cell performs measurements.

The physical layer of TD-SCDMA is based on the measurement of the TD-SCDMA cell, ^! The measurement result is sorted. In order to improve the speed of the cell selection by the dual mode terminal, the physical layer of the TD-SCDMA reports the information of the TD-SCDMA cell corresponding to the measured maximum value to the dual mode terminal. The dual mode terminal calculates the power level C1 and the cell reselection rule C2 value of the TD-SCDMA cell, and determines whether the TD-SCDMA cell satisfies the camping condition. When the TD-SCDMA 'j, the area satisfies the camping condition, and the condition of the first GSM cell currently camped on by the dual mode terminal is good, the dual mode terminal selects to camp on the TD-SCDMA cell, and receives the TD-SCDMA cell. Broadcast and system messages. In order to speed up the selection of the cell by the dual mode terminal, in the embodiment, the RRC transmits the information of the TD-SCDMA cell adjacent to the dual mode terminal location to the physical layer of the TD-SCDMA, and the RRC sends the timer time length information of the timer to The physical layer of the TD-SCDMA indicates that the physical layer of the TD-SCDMA measures the TD-SCDMA cell within the timing length of the timer, wherein the timing length of the timer is the physical layer of the TD-SCDMA pair for each TD - An integer multiple of the time the SCDMA cell takes measurements. When the timer is within the time limit of the timer, the dual-mode terminal determines the measurement result provided to the dual-mode terminal according to the physical layer of the TD-SCDMA to the measurement of the TD-SCDMA cell, and the dual-mode terminal determines that there is a TD- that satisfies the camping condition. The SCDMA cell, and the camping condition of the TD-SCDMA cell is better than the camping condition of the first GSM cell currently camped on by the dual mode terminal, the dual mode terminal selects to camp on the TD-SCDMA cell. When the timer is within the time limit of the timer, the dual-mode terminal determines that there is no TD-SCDMA cell that satisfies the camping condition or the TD-SCDMA cell according to the measurement result of the TD-SCDMA cell reported by the physical layer of the TD-SCDMA. The camping condition is worse than the condition of the first GSM cell, or the timer timeout expires, and there is still no TD-SCDMA cell with better condition than the first GSM cell currently camped on by the dual mode terminal, then the dual mode terminal judges There is no better TD-SCDMA cell than the currently camped first GSM cell. At this time, the dual mode terminal extends the timer time, that is, the number of times the cell measurement is performed. The dual-mode terminal reports the time-delayed information of the extended timer to the first GSM cell currently camped on by the dual-mode terminal, and selects the GSM-cell and then selects the TD-SCDMA cell to select whether to exist or not. A conditional condition, and a cell with a better camp condition than the current first GSM cell condition, or a timer may be directly turned off, and the TD-SCDMA cell is selected according to the method of selecting the GSM cell first, and then selecting whether the presence of the loyalty bar is satisfied. And the camping condition is better than the current first GSM 'J, the area is better. When the dual mode terminal judges that there is no TD-SCDMA cell with better conditions than the first GSM cell where the current dual mode terminal camps, the measurement of the GSM cell can be started. The dual-mode terminal-based information about the GSM cell adjacent to its location, for each neighboring GSM cell information, when the RRC measures the neighboring GSM cell, the RRC will measure the result to the dual-mode terminal. The dual-mode terminal 4 determines, for each GSM cell adjacent to each location, whether there is a second GSM cell that is better than the first GSM cell currently camped on by the dual-mode terminal, and when the second GSM cell exists, the dual-mode terminal selects The second GSM cell is camped on. In order to speed up the efficiency of the 'j, zone selection, the dual mode terminal can use the timer policy. When the RRC informs the physical layer of the GSM to perform GSM cell measurement for each location adjacent GSM cell information, the RRC The time length information of the timer that is started is sent to the physical layer, and the time length of the timer may be an integer multiple of the time that the physical layer performs measurement on each cell. When the dual-mode terminal receives the measurement result returned by the physical layer within the time length of the timer, and determines that there is a second GSM cell with a better first GSM cell condition currently camped on the dual-mode terminal, the dual-mode terminal selects The second GSM is camped on. When the dual-mode terminal does not find the second GSM cell with the first GSM cell condition that the current dual-mode terminal camps within the time limit of the timer, or the timer timeout of the timer expires, the dual-mode terminal does not When the second GSM cell with the first GSM cell condition that is currently camped on by the current dual mode terminal is found, the dual mode terminal determines that there is no second GSM that is better than the current GSM 'J and the zone condition. For the cell, the dual mode terminal can continue to camp on the first GSM cell. Embodiment 4 In this embodiment, in order to improve the experience of the dual-mode terminal on the 3G network and improve the utilization of the 3G network resources, a dual-mode terminal is provided. When the dual-mode terminal is powered on, the 3G cell is preferentially searched and resides in the content. In a 3G cell with a camping condition, when there is no 3G cell that satisfies the camping condition, the dual mode terminal searches for the 2G cell and camps on the 2G cell that satisfies the camping condition. Since in the present embodiment, the dual mode terminal first searches for the 3G cell and camps on the 3G cell that satisfies the camping condition, thereby improving the experience of the user of the dual mode terminal on the 3G network. The modules included in the dual mode terminal of the embodiment and the functions of the modules will be described in detail below with reference to the accompanying drawings. FIG. 6 is a schematic structural diagram of a dual mode terminal according to Embodiment 4 of the present invention, where the dual mode terminal The method includes: a search module 61, configured to perform a cell search after the power is turned on; and a determining module 62, configured to determine, according to the search result of the search module, whether there is a 3G cell that satisfies the camping condition, and determine whether there is a 2G cell that satisfies the camping condition. a resident module 63, when there is a 3G cell that satisfies the camping condition, stays in the 3G cell that satisfies the camping condition, and determines that there is a 2G cell that satisfies the camping condition, and resides in the satisfied resident The conditional 2G cell; the control module 64, configured to: when the determining module determines that there is no 3G cell that satisfies the camping condition, control the search module to search for the 2G cell. The search module 61 may include: a first search unit 611, configured to search for a TD-SCDMA cell on a frequency band of 2010-2015 MHZ; and a second search unit 612, configured to search for a TD-SCDMA cell according to locally saved cell information. The dual-mode terminal may further include: a first measurement module 65, configured to acquire 3G cell information adjacent to the location when camping in the G-cell, and measure the neighboring 3G cell according to the acquired 3G cell information. The camping module 63 can also be used to determine that there is a 3G cell that is better than the currently camped 3G cell condition, and camps on the 3G cell with good conditions, and determines that there is no better condition than the currently camped 3G cell. When the 3G cell is in, it continues to the currently camped 3G cell. In the dual mode terminal, the control module 64 is further configured to determine that the currently camped 3G cell does not meet the camping condition, and determine that the measurement module does not exist in the neighboring 3G cell. When the modulo terminal is currently in a 3G cell with a good 3G cell condition, the measurement module is controlled to perform measurement on the 2G cell; the first measurement module 65 can also be used to obtain 2G cell information adjacent to the location, and then The neighboring 2G cell is measured according to the acquired 2G cell information; The camping module 63 may be further configured to: when there is a 2G cell that is better than the currently camped 3G cell condition, camp on the 2G cell with the good condition, and there is no 3G cell condition that is currently camped on. When a good 2G cell is used, it continues to camp on the currently camped 3G cell. The dual-mode terminal may further include: a second measurement module 66, configured to acquire 3G cell information adjacent to the location when camping in the 2G cell, and measure the neighboring 3G cell according to the acquired 3G cell information, Obtaining 2G cell information adjacent to the location, and performing measurement on the neighboring 2G cell according to the acquired 2G cell information; the camping module 63 may be further configured to determine that there is a 3G cell that is better than the currently camped 2G cell condition. Residing in the conditionally good 3G cell; the control module 64 may be further configured to: after determining that there is no 3G cell that is better than the currently camped 2G cell condition, control the measurement module to perform measurement on the 2G cell; The camping module 63 can also be used to determine that there is a 2G cell that is better than the currently camped 2G cell condition, and camp on the 2G cell with good conditions, and there is no better condition than the currently camped 2G cell. When the 2G cell is in use, it continues to camp on the currently camped 2G cell. The dual-mode terminal may further include: a second measurement module 66, configured to acquire 2G cell information adjacent to the location when camping in the 2G cell, and measure the neighboring 2G cell according to the acquired 2G cell information. Obtaining 3G cell information that is adjacent to the location, and performing measurement on the neighboring 3G cell according to the acquired 3G cell information; the resident module 63 may be further configured to determine that there is a 2G cell that is better than the currently camped 2G cell condition. And the control module 64 is further configured to: after determining that there is no 2G cell that is better than the currently camped 2G cell, and controlling the measurement module to perform measurement on the 3G cell; The camping module 63 may be further configured to: when there is a 3G cell that is better than the currently camped 2G cell condition, camp on the 3G cell with the good condition, and there is no 2G cell condition that is currently camped on. When a good 3G cell is used, it continues to camp on the currently camped 2G cell. In summary, the embodiment of the present invention provides a network selection method for a dual mode terminal and a dual mode terminal. When the dual mode terminal is powered on, the method searches for a 3G cell to determine whether there is a 3G cell that satisfies the camping condition. When there is a 3G cell that satisfies the camping condition, it resides in the said camping condition

3G cell, otherwise, search for 2G (eg, GSM) cell, determine if there is a resident condition The 2G cell, when there is a 2G cell that satisfies the camping condition, resides in the 2G cell that satisfies the camping condition. In the embodiment of the present invention, after the dual-mode terminal is powered on, the 3G cell is searched first, and when there is no 3G cell that satisfies the camping condition, the 2G (for example, GSM) cell is searched, thereby improving the user-to-3G network of the dual-mode terminal. The experience, while improving the utilization of 3G network resources. It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and the modifications of the invention

Claims

A network selection method for a dual mode terminal, comprising: searching for a 3G cell of a third generation mobile communication system after the dual mode terminal is powered on; determining whether there is a 3G cell that satisfies a camping condition, and when the presence satisfies the resident a conditional 3G cell, camping on the 3G cell that satisfies the camp condition;

Otherwise, the second generation mobile communication system 2G cell is searched to determine whether there is a 2G cell satisfying the camping condition, and when there is a 2G cell satisfying the camping condition, camping on the 2G cell satisfying the camping condition.

2. The method according to claim 1, wherein the searching for a 3G cell comprises:

The dual mode terminal searches for a time division synchronous code division multiple access TD-SCDMA cell on a frequency band of 2010-2015 MHz; or

The dual mode terminal searches for a TD-SCDMA cell according to locally stored cell information.

The method according to claim 1, wherein when the dual mode terminal is currently camped on a 3G cell, the method further includes:

The dual mode terminal acquires 3G cell information adjacent to the location of the dual mode terminal, and measures the neighboring 3G cell according to the obtained 3G cell information;

According to the measurement result, when it is determined that there is a 3G cell with a better 3G cell condition that the dual mode terminal currently camps, the dual mode terminal camps on the 3G cell with good condition, otherwise the dual mode terminal continues to reside. In the currently camped 3G cell.

4. The method according to claim 3, wherein the method further comprises:

When the 3G cell currently camped by the dual mode terminal does not satisfy the camping condition, and the dual mode terminal is in the measurement result of the neighboring 3G cell, it is determined that there is no good condition of the 3G cell currently camped on the dual mode terminal. In the case of a 3G cell, the dual-mode terminal acquires 2G cell information adjacent to its location, and measures the neighboring 2G cell according to the acquired 2G cell information; according to the measurement result, when it is determined that there is a current mode of the dual-mode terminal When the 2G cell with good 3G cell condition is left, the dual mode terminal camps on the 2G cell with good condition. Otherwise, the dual mode terminal continues to camp on the currently camped 3G cell. The method according to claim 1, wherein when the dual mode terminal camps on a 2G cell, the method further includes:

The dual-mode terminal acquires 3G cell information adjacent to its location, and performs measurement on the neighboring 3G cell according to the acquired 3G cell information;

According to the measurement result, when it is determined that there is a 3G cell with a better 2G cell condition that the dual mode terminal currently camps, the dual mode terminal camps on the 3G cell with good condition; otherwise, the dual mode terminal acquires The information of the adjacent 2G cell of the dual mode terminal is located, and the neighboring 2G cell is measured according to the acquired 2G cell information;

According to the measurement result, when it is determined that there is a 2G cell with a better 2G cell condition that the dual mode terminal currently camps, the dual mode terminal camps on the 2G cell with good condition; otherwise, the dual mode terminal continues to reside in the The currently camped 2G cell. The method of claim 1, wherein when the dual mode terminal resides in a 2G cell, the method further comprises:

The dual mode terminal acquires the information of the 2G cell adjacent to the location of the dual mode terminal, and obtains the 2G cell information to measure the neighboring 2G cell.

According to the measurement result, when it is determined that there is a 2G cell with a better 2G cell condition that the dual mode terminal currently camps, the dual mode terminal camps on the 2G cell with good condition; otherwise, the dual mode terminal acquires its location adjacent to the location. 3G cell information, and the neighboring 3G cell is measured according to the acquired 3G cell information;

According to the measurement result, when it is determined that there is a 3G cell with a good 2G cell condition currently camped on by the dual mode terminal, the dual mode terminal camps on the 3G cell with good condition; otherwise, the dual mode terminal continues to reside. In the currently camped 2G cell. The method of claim 5 or 6, wherein measuring the neighboring 2G cells comprises:

The measurement is performed on the neighboring 2G cell within the length of the timer, wherein the timer has a timing length that is an integer multiple of the measurement time of the 2G cell.

A dual mode terminal, comprising: a searching module, configured to perform a cell search after booting;

a determining module, configured to determine, according to the search result of the search module, whether there is a 3G cell that satisfies the camping condition, and determine whether there is a 2G cell that satisfies the camping condition; a camping module, when there is a 3G cell that satisfies the camping condition, staying in the 3G cell that satisfies the camping condition, and determining that there is a 2G cell that satisfies the camping condition, camping on the camping condition 2G cell;

And a control module, configured to control the search module to search for a 2G cell when the determining module determines that there is no 3G cell that satisfies the camping condition.

The dual mode terminal according to claim 8, wherein the search module comprises:

a first search unit, configured to search for a TD-SCDMA cell in a frequency band of 2010-2015 MHz;

And a second searching unit, configured to search for the TD-SCDMA cell according to the locally saved cell information.

10. The dual mode terminal of claim 8 wherein:

The dual-mode terminal further includes: a first measurement module, configured to acquire 3G cell information adjacent to the location when the 3G cell is camped, and perform measurement on the neighboring 3G cell according to the acquired 3G cell information;

The camping module is further configured to determine that there is a 3G cell that is better than the currently camped 3G cell, and camps on the 3G cell with good conditions, and determines that there is no 3G cell that is better than the currently camped 3G cell. When continuing, the 3G cell currently camping on.

11. The dual mode terminal according to claim 10, wherein: in the dual mode terminal:

The control module is further configured to determine that the currently camped 3G cell does not meet the camping condition, and determine that there is no 3G cell condition currently camped on by the dual mode terminal according to the measurement result of the measurement module to the neighboring 3G cell. When a good 3G cell is used, the measurement module is controlled to perform measurement on the 2G cell;

The first measurement module is further configured to acquire 2G cell information adjacent to the location, and perform measurement on the neighboring 2G cell according to the acquired 2G cell information;

The camping module is further configured to determine that a 2G cell with a better condition than the currently camped 3G cell resides in the 2G cell with the good condition, and the condition of the 3G cell that is currently resident is not good. When the 2G cell is in use, it continues to camp on the currently camped 3G cell.

12. The dual mode terminal of claim 8 wherein:

The dual mode terminal further includes: a second measurement module, configured to camp on the 2G cell, Obtaining 3G cell information adjacent to the location, and measuring the neighboring 3G cell according to the acquired 3G cell information, acquiring 2G cell information adjacent to the location, and measuring the neighboring 2G cell according to the acquired 2G cell information;

The camping module is further configured to determine that a 3G cell that is better than a currently camped 2G cell condition is camped on the conditionally good 3G cell;

The control module is further configured to: after determining that there is no 3G cell that is better than a currently camped 2G cell, control the measurement module to perform measurement on the 2G cell;

The camping module is further configured to: when there is a 2G cell with a better 2G cell condition than the current camping, camp on the 2G cell with the good condition, and the condition of the 2G cell that is currently resident is not good. When the 2G cell is in use, it continues to camp on the currently camped 2G cell.

13. The dual mode terminal of claim 8 wherein:

The dual-mode terminal further includes: a second measurement module, configured to acquire 2G cell information adjacent to the location when camping on the 2G cell, and measure the neighboring 2G cell according to the acquired 2G cell information, and obtain the same Positioning adjacent 3G cell information, and measuring neighboring 3G cells according to the acquired 3G cell information;

The camping module is further configured to determine that there is a 2G cell that is better than the currently camped 2G cell condition, and camps on the 2G cell with good conditions;

The control module is further configured to: after determining that there is no 2G cell that is better than a currently camped 2G cell, control the measurement module to perform measurement on the 3G cell;

The camping module is further configured to determine that a 3G cell that is better than the currently camped 2G cell condition resides in the 3G cell with good conditions, and that there is no better condition than the currently camped 2G cell. When the 3G cell is in use, it continues to camp on the currently camped 2G cell.