WO2008141563A1 - Method, terminal and system for cell selection - Google Patents

Abstract

A method, terminal and system for cell selection are disclosed. The said method comprises: terminal being triggered to carry out cell selection; terminal determining if there is an indication of selecting a specific cell, selecting the specific cell first if there exists the said indication, otherwise selecting a cell according to signal quality or signal strength of the cell. With this method, terminal can select private cell first to reside according to previous configuration or requirement of user when private cell and macro cell coexist.

Description

 Method, terminal and system for realizing cell selection

Technical field

 The present invention relates to the field of mobile communication technologies, and in particular, to a method, a terminal, and a system for implementing cell selection. Background technique

 Currently, mobile communication has developed very popular. In order to enable a user to implement mobile communication using his terminal, it is necessary to perform cell selection after the terminal is powered on, thereby enabling the mobile terminal to camp on the selected cell to implement mobile communication. Of course, in actual applications, cell reselection is also required due to terminal mobility. In this case, cell selection is also required for the terminal, so that the terminal can camp in the newly selected cell to implement mobile communication.

 Take the cell selection during the booting process of the terminal as an example. When the terminal is powered on, the appropriate public land mobile communication network (PLMN) is selected first, and then the terminal needs to be selected for cell camping in a suitable cell to implement mobile communication. In the prior art, cell selection is mainly performed according to radio conditions, that is, signal quality or signal strength. In the prior art, the specific implementation of the selection is:

 In the cell selection process, the terminal scans all radio frequency (RF) channels according to its own capabilities to search for a suitable cell. On each carrier frequency, the terminal only searches for the cell with the strongest signal, and once the appropriate cell is found, The terminal attempts to camp in the selected cell; wherein, the criterion for selecting a suitable cell is an S criterion, that is, if the measurement result of the current cell satisfies the condition that the cell selection reception level value is >0 and the cell selection quality value is >0, then The current cell is a suitable cell; in the foregoing S criterion, the cell selection reception level value=the measured cell level value-the minimum level value one path loss compensation value required for cell selection, and the cell selection quality value=measurement cell quality The value of one selects the minimum quality value required by the cell.

At the same time, with the continuous development of mobile communication technologies, there have been A private cell such as a type of cell or a private network cell, such a private cell allows only a specific group of users to camp or access, and the terminal can preferentially camp in the private cell according to the network configuration or its own setting, thereby being in the cell. Get more flexible and personalized communication services. Generally, the coverage of the private cell is relatively small, and the power of the macro cell is not strong, and correspondingly, the signal quality or the signal strength is not strong. Therefore, if the private cell is coexisting with the macro cell, the selection method in the prior art is still adopted, and cell selection according to the cell signal quality or signal strength is likely to be due to the signal quality of the private cell or The signal strength is not strong in the macro cell, and the cell cannot be preferentially selected, so that the terminal cannot meet the network configuration or the setting of the user and is preferentially camped in the private cell, so that the purpose required for the cell selection cannot be achieved. Summary of the invention

 In view of this, an object of the embodiments of the present invention is to provide a method, a terminal, and a system for implementing cell selection, so that the private cell can be preferentially selected according to the corresponding configuration even if the private cell and the macro cell coexist.

 To achieve the above objective, the embodiment of the present invention provides the following technical solutions:

 A method for implementing cell selection, the method comprising:

 The terminal is triggered to perform cell selection;

 The terminal judges whether there is an indication to select a specific cell, and if so, preferentially selects a specific cell, otherwise, performs cell selection according to cell signal quality or signal strength.

 A terminal for implementing cell selection, the terminal comprising:

 a storage unit, configured to store specific cell information of the terminal;

 a determining unit, configured to determine whether the specific cell information is stored in the storage unit when performing cell selection, and notifying the selection unit of the determination result;

 And a selecting unit, configured to preferentially select a specific cell according to the judgment result of the determining unit and the specific cell information stored by the storage unit, or perform cell selection according to signal quality or signal strength.

A terminal for implementing cell selection, the terminal comprising: a broadcast message reading unit, configured to read a broadcast message on the network side;

 An identifier unit, configured to store a class identifier assigned to the terminal or an identifier corresponding to the class identifier;

 a determining unit, configured to determine, according to the identifier stored in the identifier unit, whether the specific cell information of the terminal is included in the broadcast message, and notifying the selection unit of the determination result;

 And a selecting unit, configured to preferentially select a specific cell according to the judgment result of the determining unit and the specific cell information in the broadcast message read by the broadcast message reading unit, or perform cell selection according to signal quality or signal strength.

 A system for implementing cell selection, the system includes a terminal and a network side device, where: the network side device is configured to: send a broadcast message, where the broadcast message includes specific cell information of different terminals;

 The terminal is configured to: read a broadcast message sent by the network side device, determine whether the specific cell information of the terminal is included in the broadcast message, and preferentially select a specific cell according to the determination result, or perform cell selection according to signal quality or signal strength. .

 It can be seen that, by using the embodiment of the present invention, the terminal can preferentially select the private cell to try to camp even if the private cell and the macro cell coexist, thereby ensuring that the corresponding service can be quickly and effectively implemented by the private cell, thereby facilitating the improvement of the private cell. Quality of service. DRAWINGS

 1 is a flow chart of an overview method provided in an embodiment of the present invention;

 2 is a flowchart of a method according to Embodiment 1 of the present invention;

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

 4 is a flowchart of a method provided by Embodiment 2 of the present invention;

FIG. 5 is a schematic diagram of a terminal according to Embodiment 2 of the present invention. detailed description The embodiment of the present invention provides a method, a terminal, and a system for implementing cell selection. When a terminal performs cell selection, it first determines whether there is an indication to select a specific cell, and if so, preferentially selects a specific cell according to the indication. In the above manner, in a case where the private cell and the macro cell coexist, the private cell can be preferentially selected according to the network configuration or the setting of the terminal itself, and further the terminal can be camped in the preferentially selected private cell, thereby implementing The private cell obtains communication services.

 The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

 Referring to FIG. 1, in an embodiment of the present invention, a method for implementing an embodiment of the present invention includes the following steps:

 Step 101: The terminal is triggered to perform cell selection.

 The trigger mechanism is different according to the situation of the terminal. In one case, the terminal currently performs the power-on operation and is triggered to perform cell selection. After the power-on, the terminal needs to select the PLMN first, and then specifically The subsequent cell selection step is performed; the other case is: when the terminal moves, and the cell reselection is required, the terminal is triggered to perform cell selection; for the convenience of description, in the following descriptions of the embodiments, the terminal performs The case of the booting operation is taken as an example. When the terminal performs reselection, the specific implementation of each embodiment of the present invention is similar to the specific implementation when the terminal is operated;

 Step 1 02: The terminal determines whether there is an indication to select a specific cell, and if yes, performs step 103; otherwise, performs step 104;

 Step 1 03: According to the indication of selecting a specific cell, the terminal preferentially selects a specific cell, and then ends the process;

 Step 1 04: The terminal performs cell selection according to the cell signal quality or signal strength, and then ends the process.

After the steps 103 and 104 are performed, the method further includes the following steps: The terminal camps on the selected cell according to the result of the cell selection. In the different embodiments of the present invention, the indication to the specific cell may be implemented in different manners. In the following, the embodiments of the present invention are described in detail in conjunction with the different manners:

 Embodiment 1 In this embodiment, the terminal maintains and stores information of a specific cell. When performing cell selection, the information of the specific cell is used as an indication for selecting a specific cell. Referring to FIG. 2, the embodiment specifically includes The following steps:

 Step 201: The terminal is powered on, and the PLMN is selected.

 Step 202: Determine whether the specific cell information is stored in the terminal, and if yes, determine that there is an indication that the current cell is selected to the specific cell, and perform step 203; otherwise, determine that there is no indication to select the specific cell, and perform step 204. ;

 Step 203: Select a specific cell as a cell in which the terminal camps according to the indication of the selected specific cell and the information of the specific cell to be stored, and then end the process of cell selection.

 In the preferred embodiment of the present invention, a plurality of specific cell information may be stored in the terminal. In this case, in step 203, the selection of the specific cell may be performed according to the priority order of the specific cell information, or The signal quality and signal strength of the specific cell are measured, and the specific cell is selected according to the signal quality or the signal strength. Alternatively, the specific cell may be selected from the specific cell according to the type of service requested by the user. Other specific cell selection methods may be adopted, and these selection methods do not affect the implementation of the present invention;

 Step 204: Since it has been determined in step 202 that there is no indication that a specific cell is currently selected, the cell selection is performed according to the signal quality or signal strength, and then the flow of the cell selection is ended.

 In a preferred embodiment of the present invention, in order to be more flexible and adaptable to the needs of the actual use, the method provided in Embodiment 1 of the present invention may further include:

Performing maintenance on the specific cell information stored in the terminal, the maintenance includes: adding, deleting, and/or modifying specific cell information, so that the specific cell information stored in the terminal can be consistent with the actual cell planning situation. Of course, before performing the above maintenance, you can first confirm the maintenance authority to improve the security of maintenance. Corresponding to the method provided in the first embodiment, referring to FIG. 3, the first embodiment of the present invention further provides a terminal for implementing cell selection, where the terminal includes:

 The storage unit 301 is configured to store specific cell information of the terminal.

 The determining unit 302 is configured to determine whether the specific cell information is stored in the storage unit 301 when the cell selection is performed, and notify the selecting unit 303 of the determination result;

 The selecting unit 303 is configured to preferentially select a specific cell as a cell in which the terminal camps according to the judgment result of the determining unit 302 and the specific cell information stored in the storage unit 301, or perform cell selection according to signal quality or signal strength.

 The terminal may further include a maintenance unit 304, configured to perform maintenance on specific cell information stored in the storage unit 301.

 Embodiment 2 In this embodiment, the terminal determines whether there is an indication to select a specific cell by reading the network broadcast information. Referring to FIG. 4, the embodiment specifically includes the following steps:

 Step 401: The terminal is powered on, and the PLMN is selected;

 Step 402: The terminal reads the broadcast message, and determines whether the specific cell information of the terminal is included in the broadcast message. If yes, it determines that there is an indication that the current cell is selected to the specific cell, and performs step 403; otherwise, it determines that the current non-existence exists. In the embodiment of the present invention, the network side device always sends the broadcast message, and the broadcast message occupies a common channel, so that once the terminal is powered on or performs cell reselection, In the embodiment of the present invention, the base station may be used as the network side device, and of course, other types of network side devices may also be used. Affecting the implementation of the present invention;

The broadcast message on the common channel is readable for the terminals in all the cells, but in actual applications, the specific cells preferentially selected by different terminals are different. For example, in a home cell scenario, only some terminals can camp and access the home cell, while other terminals are not allowed to camp. In an office cell scenario, only some of the corresponding terminals can be camped on and accessed. The office area, while others are not allowed to camp. In order to reflect this area Another ¹ J, according to the requirements of different terminals for preferentially selecting a specific cell, configuring specific cell information of different terminals in the broadcast message, and adding only the identifier that the terminal can recognize in the information, so that only the terminal It is able to identify its own specific cell information from the broadcast message, which is not available to other terminals. Therefore, in step 403, the terminal reads the specific cell information corresponding to the terminal in the broadcast message according to its own identifier or the corresponding identifier, and implements the determination.

 In addition to the above manners, since different terminals that are allowed to camp in the same cell usually have the same specific cell information in actual applications, different terminals may be classified based on the cell to which the terminal is allowed to be camped. In the broadcast message, a class identifier is added to the specific cell information corresponding to the different cells, and corresponding to the different cell, the cell class identifier or the identifier corresponding to the cell that is allocated to the different terminals of the cell is uniformly allocated according to the foregoing classification result. Corresponding identifiers, such that the terminal can read the specific cell information of the category to which the terminal belongs according to the class identifier or the corresponding identifier. In step 403, the terminal reads the specific cell information corresponding to the cell in the broadcast message that allows the terminal to camp according to the class identifier or the corresponding identifier that is allocated by the terminal, and implements the determination. Of course, there may be a case where a terminal is allowed to camp on a different cell. In this case, the terminal is correspondingly assigned a class identifier or a corresponding identifier corresponding to multiple cells, so that different categories belonging to the broadcast message can be read from the broadcast message. Specific cell information corresponding to the cell.

 Step 403: Select a specific cell as a cell in which the terminal camps according to the indication of the selection to the specific cell and the specific cell information of the terminal in the broadcast message, and then end the process of cell selection.

It should be noted that, in step 403, if the terminal can read the specific cell information from the broadcast message according to the class identifier or the corresponding identifier that is allocated by the terminal, the terminal may also be similar to step 203, according to the specific cell. The priority order of the information is used to select a specific cell, or the signal quality and signal strength of the specific cells are measured, the specific cell is selected according to the signal quality or the signal strength, or, according to the type of service requested by the user, Selecting a suitable specific cell from the above specific cells, and of course, may also include other specific cell selection methods. None of the choices affect the implementation of the invention.

 Step 404: Since it has been determined in step 402 that there is currently no indication to select a specific cell, the cell selection is performed according to the signal quality or signal strength, and then the process of cell selection is ended.

 Similar to the first embodiment, in order to be more flexible and adaptable to the needs of the actual use, the method provided in the first embodiment of the present invention may further include a maintenance operation, which may specifically be:

 Adding, deleting, and/or modifying specific cell information of the terminal in the broadcast message, so that the information can be consistent with the actual cell planning situation; or adding, deleting, and/or modifying the class identifier assigned to the terminal or the class identifier Corresponding identifiers, in this way, the specific cell information that the terminal can read is changed, so that the cell situation in which the terminal can be camped is consistent with the actual cell planning situation. Of course, before performing the above maintenance, you can first confirm the maintenance authority to improve the security of maintenance.

 Corresponding to the method provided in the foregoing embodiment 2, referring to FIG. 5, the second embodiment of the present invention further provides a terminal for implementing cell selection, where the terminal includes:

 a broadcast message reading unit 501, configured to read a broadcast message on the network side;

 The identifying unit 502 is configured to store a class identifier assigned to the terminal or an identifier corresponding to the class identifier;

 The determining unit 503 is configured to determine, according to the identifier stored in the identifier unit, whether the specific cell information of the terminal is included in the broadcast message, and notify the selection unit 504 of the determination result, and the selecting unit 504 is configured to use the determining unit 503. The result of the judgment and the specific cell information in the broadcast message read by the broadcast message reading unit 501 preferentially select a specific cell as a cell in which the terminal camps, or perform cell selection according to signal quality or signal strength.

The terminal may further include a maintenance unit 505, configured to add, delete, and/or modify a class identifier stored in the identifier unit 502 or an identifier corresponding to the class identifier, and in this manner, the terminal can be read and read. The specific cell information is such that the cell situation in which the terminal can camp is consistent with the actual cell planning situation. In the meantime, the embodiment of the present invention further provides a system for implementing cell selection, where the system includes a network side device and a terminal, where:

 The network side device is configured to: send a broadcast message, where the broadcast message includes specific cell information of different terminals; the network side device may be a base station, or may be another type of network side device capable of implementing the foregoing functions;

 The terminal is configured to: read a broadcast message sent by the network side device, determine whether the specific cell information of the terminal is included in the broadcast message, and preferentially select a specific cell as a terminal camped cell according to the determination result or according to signal quality or signal strength Make a cell selection.

 The system may further include:

 The maintenance device is configured to add, delete, and/or modify specific cell information of the terminal in the broadcast message, so that the information can be consistent with the actual cell planning situation.

 In addition, in the method provided by the foregoing embodiments, after the cell that is the terminal camping is selected, the method further includes the following steps:

 The terminal attempts to camp in the specific cell that is preferentially selected. If the camping is successful, the process ends. If the camping fails, it is determined whether there are other specific cells that can be camped. If yes, continue to try to camp on the other cell. For a particular cell to camp, if there is no or attempt to camp to the other specific cell that can be camped, the cell selection is based on signal quality or signal strength.

 It should be noted that, in the foregoing various embodiments of the present invention, the specific cell is a private cell such as a home cell or a private network cell. In other embodiments of the present invention, other types of cells may be used as needed. As the specific cell, the implementation of the present invention is not affected.

 The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

Claim  A method for implementing cell selection, the method comprising:  The terminal is triggered to perform cell selection;  The terminal judges whether there is an indication to select a specific cell, and if so, preferentially selects a specific cell, otherwise, performs cell selection according to cell signal quality or signal strength.  The method according to claim 1, wherein the information of the specific cell is stored in the terminal that needs to preferentially select the specific cell, and the specific implementation of the terminal determining whether there is an indication to select the specific cell is:  Determining whether specific cell information is stored in the terminal;  The specific implementation of the preferential selection of a specific cell is:  The specific cell is preferentially selected according to the information of the specific cell stored by the terminal.  The method according to claim 2, wherein the method further comprises: performing any one of adding, deleting, modifying, or a combination thereof on the specific cell information stored in the terminal.  The method according to claim 1, wherein each of the different terminals that need to preferentially select a specific cell is separately configured in a broadcast message, and the terminal determines whether there is a specific indication for selecting a specific cell. Implemented as:  The terminal reads the broadcast message, and determines whether the specific cell information of the terminal is included in the broadcast message. The specific implementation of the preferentially selecting a specific cell is:  The specific cell is preferentially selected according to the specific cell information of the terminal in the broadcast message.  The method according to claim 4, wherein the specific implementation of configuring the specific cell information for different terminals that need to preferentially select a specific cell in the broadcast message is: configuring different terminals in the broadcast message Specific cell information, and adding only the identifier that the terminal can recognize in the information;  The specific implementation of the terminal reading the broadcast message is: The terminal reads a broadcast message according to its own identifier or an identifier corresponding to its own identifier. The specific cell information corresponding to the terminal.  The method according to claim 5, wherein the method further comprises: performing any one of adding, deleting, and modifying the specific cell information of the terminal in the broadcast message or a combination thereof.  The method according to claim 4, wherein the specific implementation of the respective specific cell information for different terminals that need to preferentially select a specific cell in the broadcast message is: in the broadcast message, the cell is Adding a class identifier corresponding to the specific cell information, where the class identifier is the same as or corresponding to the class identifier assigned to different terminals that are allowed to be camped on the cell;  The specific implementation of the terminal reading the broadcast message is:  The terminal reads the specific cell information corresponding to the class identifier in the broadcast message according to the class identifier assigned by itself or the identifier corresponding to the class identifier.  The method according to claim 7, wherein the method further comprises: performing any one of adding, deleting, and modifying the class identifier assigned by the terminal or the identifier corresponding to the class identifier or combination.  The method according to any one of claims 1-8, wherein a plurality of the specific cell information are present in a corresponding one of the terminals, and the specific implementation of the preferentially selecting a specific cell is:  Selecting a specific cell according to a priority order of the specific cell information; or measuring a signal quality and a signal strength of the specific cell, selecting a specific cell according to a signal quality or a signal strength, or according to a user The type of service requested, selecting a suitable specific cell from the specific cells.  The method according to any one of claims 1-8, wherein the preferentially selecting a specific cell further comprises: Try to camp in the specific cell of the preference. If the camping is successful, the process ends. If the camping fails, it is determined whether there are other specific cells available for camping. If so, continue to try to camp on the other available. The specific cell that is camped on, if there is no or attempt to camp to the other specific cell that can be camped, fails, and then the cell is selected according to the signal quality or signal strength. The method according to any one of claims 1-8, wherein the specific cell is a private cell.  The method according to claim 11, wherein the private cell is a home cell or a private network cell.  A terminal for implementing cell selection, wherein the terminal includes:  a storage unit, configured to store specific cell information of the terminal;  a determining unit, configured to determine whether the specific cell information is stored in the storage unit when performing cell selection, and notifying the selection unit of the determination result;  And a selecting unit, configured to preferentially select a specific cell according to the judgment result of the determining unit and the specific cell information stored by the storage unit, or perform cell selection according to signal quality or signal strength.  The terminal according to claim 13, wherein the terminal further includes a maintenance unit, configured to perform any one of adding, deleting, and modifying the specific cell information stored in the storage unit or combination.  A terminal for implementing cell selection, wherein the terminal comprises:  a broadcast message reading unit, configured to read a broadcast message on the network side;  An identifier unit, configured to store a class identifier assigned to the terminal or an identifier corresponding to the class identifier;  a determining unit, configured to determine, according to the identifier stored in the identifier unit, whether the specific cell information of the terminal is included in the broadcast message, and notifying the selection unit of the determination result;  And a selecting unit, configured to preferentially select a specific cell according to the judgment result of the determining unit and the specific cell information in the broadcast message read by the broadcast message reading unit, or perform cell selection according to signal quality or signal strength.  The terminal according to claim 15, wherein the terminal further includes a maintenance unit, configured to add, delete, or modify the class identifier stored in the identity unit or the identifier corresponding to the class identifier. Any of the operations or a combination thereof. 17. A system for implementing cell selection, characterized in that the system comprises a terminal and a network side Equipment, where:  The network side device is configured to: send a broadcast message, where the broadcast message includes specific cell information of different terminals;  The terminal is configured to: read a broadcast message sent by the network side device, determine whether the specific cell information of the terminal is included in the broadcast message, and preferentially select a specific cell according to the determination result, or perform cell selection according to signal quality or signal strength. .  The system according to claim 17, wherein the system further comprises: a maintenance device, configured to perform any one of adding, deleting, and modifying specific cell information of the terminal in the broadcast message or combination.