WO2010083700A1

WO2010083700A1 - Cell selection method and apparatus for mobile terminal in home base station cell

Info

Publication number: WO2010083700A1
Application number: PCT/CN2009/075346
Authority: WO
Inventors: 支周; 吴昊; 王亚英
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-01-21
Filing date: 2009-12-07
Publication date: 2010-07-29
Also published as: CN101784102A; CN101784102B

Abstract

The present invention discloses a cell selection method for a mobile terminal in a home base station cell, which is proposed as a solution to the current inability of mobile terminals to perform cell reselection in a cell having a home base station. The solution comprises: after a mobile terminal accesses a home base station cell in open mode, the home base station cell transforms to a closed mode; the mobile terminal compares the subscriber group identifier of the home base station cell with an accessible home base station cell identifier list stored in itself; if the subscriber group identifier of the home base station cell exists in the accessible home base station cell identifier list of the mobile terminal, the mobile terminal continues to reside in the home base station cell, otherwise the mobile terminal searches neighboring cells and performs cell reselection. The present invention also discloses an apparatus implementing the above method. In this invention, the mobile terminal can reselect other available cells when the home base station cell is unavailable, thus reducing the impact on service.

Description

Method and device for selecting mobile terminal cell in home station cell

The invention relates to a method and a device for selecting a mobile terminal cell in a home base station cell. Background technique

With the rapid development of mobile networks and the reorganization of telecom mobile operators, seamless access and indoor coverage have become the focus of operators in mobile network construction. Although the important task of mobile communication is to ensure the quality of wireless communication for outdoor users, according to statistical surveys, users use the mobile network indoors for the longest time. Therefore, good network coverage, especially good indoor coverage, has become the key to ensuring the quality of mobile network services.

In response to this, the home base station technology has received enthusiastic attention and favor from operators and equipment manufacturers at home and abroad. On the one hand, the home base station can solve indoor coverage problems quickly and at low cost, providing users with high-speed data services and reducing the load on the macro base station, and on the other hand, expanding the network coverage of operators. The home base station is a small, low power base station. As a dedicated resource for private users, it is mainly deployed and applied in indoor places such as homes, schools, companies, and small group areas.

In the mobile communication system, the home base station cell, as part of the mobile communication system, can be divided into a closed home base station cell and an open family base station cell. The closed home base station cell is used to provide service to a specific user group, that is, only the mobile terminal belonging to the specific user group can access the home base station cell, and the mobile terminal itself saves an accessible The home base station cell identifier list is used to determine which home base station cells are accessible. The user group is not restricted on the open family base station cell, and all users who can search for the home base station cell are allowed to access. Like a closed home base station cell, an open family base station cell can provide users with richer services and more favorable tariffs. Therefore, in a mobile communication network in which a home base station cell is configured, when the mobile terminal performs cell reselection, priority should be given to reselection to be available. Home base station cell. However, once the administrator or owner of the home base station cell sets the home base station cell from an open type to a closed type, some users of the home base station cell that do not belong to the closed group cannot continue to enjoy the service.

At present, the home base station technology is still in a research state. For a mobile terminal that has accessed the home base station cell, how to perform cell reselection when the home base station cell is unavailable, there is no specific solution. Summary of the invention

In view of this, the main object of the present invention is to provide a method and apparatus for cell selection of a mobile terminal in a home base station cell, which can reselect other available cells when the home base station cell is unavailable.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A method for selecting a mobile terminal cell in a home base station cell includes:

The mobile terminal accessing the open-mode home base station cell, when the home base station cell is switched to the closed mode, comparing the user group identifier of the home base station cell with the home base station cell identifier list that is accessible by itself, if The home base station cell user group identifier exists in the accessible home base station cell identifier list, and then stays in the home base station cell, otherwise, searches for a neighboring cell to perform cell reselection.

Preferably, the performing cell reselection is specifically: calculating at least one of a signal strength of the searched neighboring cell, a carrier-to-interference ratio of the channel, and a distance between the mobile terminal and the base station, according to the at least one The item communication condition selects a cell with better communication conditions to camp.

Preferably, the method further comprises: the mobile terminal acquiring a user group identifier of the home base station cell by using a broadcast message of the home base station cell.

Preferably, the neighboring cell is a macro cell, or / and a home base station cell.

After the mobile terminal is powered on, requesting access to the closed mode home base station cell, and acquiring the user group standard of the closed mode home base station cell by using the closed mode home base station cell broadcast message And comparing, the obtained user identifier with the mobile home terminal's own accessible home base station cell identifier list, if the closed mode home base station cell user group identifier exists in the mobile terminal, the accessible home base station cell identifier In the list, the mobile terminal resides in the closed mode home base station cell, otherwise, the mobile terminal searches for a neighboring cell to perform cell reselection.

A device for selecting a mobile terminal cell in a home base station cell, comprising: an access unit, a comparison unit, a resident unit, and a reselection unit, where:

An access unit, located in the mobile terminal, for accessing an open mode home base station cell, and a comparing unit, configured to: when the home base station cell is switched to a closed mode, to identify a user group of the home base station cell The home base station cell identifier list accessible by the mobile terminal is compared, and if the home base station cell user group identifier exists in the accessible home base station cell identifier list, the camping unit is triggered, otherwise the reselection unit is triggered. ;

a camping unit, configured to continue to camp on the home base station cell;

A reselection unit is configured to search for neighboring cells for cell reselection.

Preferably, the reselecting unit calculates at least one of a signal strength of the searched neighboring cell, a carrier-to-interference ratio of the channel, and a distance between the mobile terminal and the base station, and selects according to the at least one communication condition. A cell with better communication conditions camps.

Preferably, the device further comprises:

And an acquiring unit, configured to acquire, by using a broadcast message of the home base station cell, a user group identifier of the home base station cell.

Device for selecting mobile terminal cell in a home base station cell, including acquiring unit, comparing Unit, resident unit, and reselection unit, where:

An acquiring unit, configured to acquire, by using the closed mode home base station cell broadcast message, a user group identifier of the closed mode home base station cell when the mobile terminal is requested to access the closed mode home base station cell;

a comparing unit, configured to compare the user identifier acquired by the acquiring unit with a list of accessible home base station cell identifiers of the mobile terminal, if the closed mode home base station cell user group identifier exists in the mobile terminal In the visited home base station cell identifier list, if the mobile terminal resides in the closed mode home base station cell, the camping unit is triggered, otherwise the reselecting unit is triggered;

a camping unit, configured to continue to camp on the home base station cell;

After the home base station cell is switched from the open mode to the closed mode, the mobile terminal accessing the open mode home base station cell determines whether the user group identity of the home base station cell exists in the stored accessible home base station cell identity list. If the non-existent home base station cell identifier list is not present, the cell reselection is initiated, and the other available cells are selected, and if they are present in the accessible home base station cell identifier list, they still reside in the family. Base station cell. Similarly, after the mobile terminal is powered on in the closed mode home base station cell, after determining that it is not a legitimate user of the home base station cell, the mobile terminal initiates cell reselection and selects another available cell. When the home base station cell is unavailable, the mobile terminal can reselect to other available cells, reducing the impact on the mobile terminal service. DRAWINGS

FIG. 1 is a schematic flowchart of a method for selecting a mobile terminal cell in a home base station cell according to an embodiment of the present invention;

2 is a schematic flowchart of a method for selecting a mobile terminal cell in a home base station cell according to another embodiment of the present invention;

3 is a schematic structural diagram of a device for selecting a mobile terminal cell in a home base station cell according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a device for selecting a mobile terminal cell in a home base station cell according to another embodiment of the present invention. The basic idea of the present invention is: After the home base station cell is switched from the open mode to the closed mode, the mobile terminal accessing the open mode home base station cell determines whether the user group identity of the home base station cell exists in its own storage. In the accessible home base station cell identifier list, if it does not exist in the accessible home base station cell identifier list, start cell reselection, select other available cells, if it exists in the accessible home base station cell identifier list And still reside in the home base station cell. Similarly, after the mobile terminal is powered on in the closed mode home base station cell, after determining that it is not a legitimate user of the home base station cell, the mobile terminal initiates cell reselection and selects other available cells. When the home base station cell is unavailable, the mobile terminal can reselect to other available cells, reducing the impact on the mobile terminal service.

The present invention will be further described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic flowchart of a method for selecting a mobile terminal cell in a home base station cell according to an embodiment of the present invention. As shown in FIG. 1 , a method for selecting a mobile terminal in a home base station cell according to an embodiment of the present invention includes:

Step 101: After the mobile terminal accesses the open mode home base station cell, the home base station cell converts In closed mode.

The mobile terminal accesses the home base station cell when the home base station cell is in the open mode. At this time, the home base station does not perform any authentication on the accessed mobile terminal, and provides access services for the mobile terminal user just like accessing the macro cell. Since the home base station belongs to the private base station, the user can set the cell mode of the home base station as needed, for example, the home base station user converts the home base station cell from the open mode to the closed mode at a certain moment. In the present invention, the cell mode of the home base station is indicated by setting special identification information, such as by one-bit character: "0" identifies the closed mode, "1" identifies the open mode; and "0" identifies the open mode. "1" identifies the closed mode. The mode information of the home base station cell may be carried by the broadcast message of the cell. The mobile terminal learns the mode of the home base station cell through the broadcast message of the home base station cell.

Step 102: The mobile terminal compares the user group identifier of the home base station cell with the user-accessible home base station cell identifier list, if the home base station cell user group identifier exists in the mobile terminal. In the accessed home base station cell identifier list, go to step 103. Otherwise, go to step 104.

The mobile terminal learns that the current home base station cell is switched from the open mode to the closed mode by using the mode identifier information of the home base station cell, and the mobile terminal determines whether the user group identifier of the home base station cell exists in the stored home base station cell identifier list. The mobile terminal obtains the user group identifier of the home base station cell by using the broadcast message of the home base station cell, and the time of obtaining the user group identifier of the home base station cell may be when the mobile terminal accesses the court base station cell for the first time. The plurality of cells covered by the home base station form a coverage area of the home base station, which is called Closed Subscriber Group (CSG). The user terminal that allows access to the coverage area of the home base station is the user of the closed subscriber group. Each closed subscriber The group is identified by the unique identifier assigned by the operator of the public land mobile network, which is called the user group identifier CSG ID, and only the authorized user can access the coverage area of the home base station. The mobile terminal user may belong to multiple closed user groups. The system allocates a home base station cell identifier list to the mobile terminal user, and the home base station cell The identification list includes the CSG ID that the user is allowed to access. Only the home base station CSG ID of the mobile terminal is identified in the mobile station's home base station d, the area identification list, and is allowed to access the current home base station cell. The CSG ID is carried by the broadcast system of the home base station cell. The home base station cell identifier list is determined by an agreement between the operator and the user, and is stored in the mobile terminal in advance.

Step 103: The mobile terminal camps on the open mode home base station cell.

When it is determined that the mobile terminal belongs to a legitimate user of the current home base station cell, it still resides in the home base station cell.

Step 104: The mobile terminal searches for a neighboring cell to perform cell reselection.

The mobile terminal searches for the neighboring cell, and after the search succeeds, performs cell signal strength measurement, channel to interference ratio, and distance calculation of the mobile terminal to the base station for the searched neighboring cell, according to the above measurement and calculation result. At least one item is used as a basis for cell selection. Specifically, a condition for cell selection may be set in the mobile terminal according to the foregoing measurement and calculation result, thereby selecting a better cell to camp. The neighbor cells searched for include a macro cell and other home base station cells.

The method for selecting a mobile terminal cell in a home base station cell according to the embodiment of the present invention further includes: after the mobile terminal is powered on, requesting access to the closed mode home base station cell, and acquiring the closed mode home base station cell user by using the closed mode home base station cell broadcast message The group identifier is compared with the list of accessible home base station cell identifiers that are stored in the home base station, if the closed mode home base station cell user group identifier exists in the accessible home base station cell identifier list of the mobile terminal, The mobile terminal continues to camp on the closed mode home base station cell, otherwise the mobile terminal searches for a neighboring cell for cell reselection. That is, when the mobile terminal and the connected home base station cell are in the closed mode, the mobile terminal obtains the closed mode home base station cell user group identifier by using the broadcast message of the home base station cell, and performs the processes of steps 102 to 104, and details are not described herein again.

2 is a schematic flowchart of a method for selecting a mobile terminal cell in a home base station cell according to another embodiment of the present invention. As shown in FIG. 2, a mobile terminal in a home base station cell according to an embodiment of the present invention is shown in FIG. The method of cell selection includes the following steps:

Step 201: The mobile terminal requests to access the closed mode home base station cell after being powered on, and obtains the closed mode home base station cell user group identifier by using the closed mode home base station cell broadcast message.

The difference between the step 201 and the step 101 is that the mode of the home base station cell accessed by the mobile terminal is different, the state of the mobile terminal is different, and the manner of obtaining the home base station cell user group identifier is the same.

Step 202: The mobile terminal compares the user group identifier of the home base station cell with the user-accessible home base station cell identifier list, if the home base station cell user group identifier exists in the mobile terminal. In the accessed home base station cell identifier list, go to step 203. Otherwise, go to step 204.

Step 203: The mobile terminal camps on the open mode home base station cell.

Step 204: The mobile terminal searches for a neighboring cell to perform cell reselection.

The processing of steps 202 to 204 is exactly the same as steps 102 to 104, and details are not described herein.

FIG. 3 is a schematic structural diagram of a device for selecting a mobile terminal cell in a home base station cell according to an embodiment of the present invention. As shown in FIG. 3, the device for selecting a mobile terminal cell in a home base station cell in this example includes an access unit 30 and a comparison unit. 31. The camping unit 32 and the reselecting unit 33, wherein: the access unit 30 is located in the mobile terminal, and is used to access an open mode home base station cell; and the comparing unit 31 is configured to convert the home base station cell into a closed mode. Comparing the user group identifier of the home base station cell with the home base station cell identifier list accessible by the mobile terminal, if the home base station cell user group identifier exists in the accessible home base station cell identifier In the list, the camping unit 32 is triggered, otherwise the reselecting unit 33 is triggered; the camping unit 32 is configured to continue to camp on the home base station cell; the reselecting unit 33 is configured to search for neighboring cells for cell reselection. The reselection unit 33 calculates the signal strength of the searched neighboring cell and the channel loading. At least one of the communication ratios of the ratio of the mobile terminal to the base station, and selecting a cell with better communication conditions to camp based on the at least one communication condition. The neighboring cell is a macro cell, or/and a home base station cell.

As shown in FIG. 3, the apparatus for selecting a mobile terminal cell in the home base station cell of the present example further includes: an obtaining unit 34, configured to acquire a user group identifier of the home base station cell by using a broadcast message of the home base station cell.

It should be understood by those skilled in the art that the apparatus for selecting a mobile terminal cell in the home base station cell shown in FIG. 3 is designed to implement the foregoing method for selecting a mobile terminal cell in the home base station cell, and the processing units in the system shown in FIG. The function can be understood by referring to the description of the method shown in FIG. 1. The functions of each processing unit can be implemented by a program running on a processor, or can be realized by a specific logic circuit. In Fig. 3, the acquisition unit 34 is not a necessary technical feature for implementing the basic technical scheme of the present invention.

FIG. 4 is a schematic structural diagram of a device for selecting a mobile terminal cell in a home base station cell according to another embodiment of the present invention. As shown in FIG. 4, the apparatus for selecting a mobile terminal cell in a home base station cell in this example includes an obtaining unit 40 and a comparison unit. The camping unit 42 and the reselecting unit 43 are configured to: obtain the closed mode by using the closed mode home base station cell broadcast message when requesting access to the closed mode home base station cell after the mobile terminal is powered on The user group identifier of the home base station cell; the comparing unit 41 is configured to compare the user identifier acquired by the acquiring unit with the accessible home base station cell identifier list of the mobile terminal itself, if the closed mode home base station cell user group identifier In the accessible home base station cell identifier list of the mobile terminal, where the mobile terminal resides in the closed mode home base station cell, the camping unit 42 is triggered, otherwise the reselecting unit 43 is triggered; Unit 42 is configured to continue to camp on the home base station cell; reselection unit 43 is configured to search for neighboring small Zone, perform cell reselection. The reselecting unit 43 calculates at least one of a signal strength of the searched neighboring cell, a carrier-to-interference ratio of the channel, and a distance between the mobile terminal and the base station, and selects a communication condition according to the at least one communication condition. A better cell is camped on. The neighboring cell is a macro cell, or/and a home base station cell.

It should be understood by those skilled in the art that the apparatus for selecting a mobile terminal cell in the home base station cell shown in FIG. 4 is designed to implement the method for selecting a mobile terminal cell in the foregoing home base station cell, and the processing units in the system shown in FIG. The function can be understood by referring to the description of the method shown in FIG. 2, and the functions of each processing unit can be implemented by a program running on a processor, or can be realized by a specific logic circuit.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A method for selecting a mobile terminal cell in a home base station cell, comprising: accessing a mobile terminal of an open-mode home base station cell, when the home base station cell is switched to a closed mode, the home base station cell Comparing the user group identifier with the home base station cell identifier list that is accessible to the home base station, if the home base station cell user group identifier is present in the accessible home base station cell identifier list, staying at the home base station Cell, otherwise, search for neighboring cells for cell reselection.

The method according to claim 1, wherein the performing cell reselection is specifically: calculating a signal strength of the searched neighboring cell, a carrier-to-interference ratio of the channel, and a distance between the mobile terminal and the base station. At least one communication condition selects a cell with better communication conditions to camp based on the at least one communication condition.

The method according to claim 2, wherein the method further comprises: the mobile terminal acquiring a user group identifier of the home base station cell by using a broadcast message of the home base station cell.

The method according to any one of claims 1 to 3, wherein the adjacent cell is a macro cell, or/and a home base station cell.

A method for selecting a mobile terminal cell in a home base station cell, comprising: requesting access to a closed mode home base station cell after the mobile terminal is powered on, and acquiring the closed mode by using the closed mode home base station cell broadcast message a user group identifier of the home base station cell, and comparing the obtained user identifier with the mobile home terminal's own accessible home base station cell identifier list, if the closed mode home base station cell user group identifier exists in the mobile terminal In the incoming home base station cell identifier list, the mobile terminal resides in the closed mode home base station cell, otherwise, the mobile terminal searches for a neighboring cell to perform cell reselection.

The method according to claim 5, wherein the performing cell reselection is specifically: calculating a signal strength of the searched neighboring cell, a carrier-to-interference ratio of the channel, and a mobile terminal and At least one of the communication conditions of the distance of the base station selects a cell with better communication conditions to camp based on the at least one communication condition.

The method according to claim 5 or 6, wherein the neighboring cell is a macro cell, or/and a home base station cell.

A device for selecting a mobile terminal cell in a home base station cell, comprising: an access unit, a comparison unit, a resident unit, and a reselection unit, wherein:

a camping unit, configured to continue to camp on the home base station cell;

The apparatus according to claim 8, wherein the reselecting unit calculates at least one of a signal strength of the searched neighboring cell, a carrier-to-interference ratio of the channel, and a distance between the mobile terminal and the base station. Condition, selecting a cell with better communication conditions to perform camping according to the at least one communication condition.

The device according to claim 9, wherein the device further comprises: an obtaining unit, configured to acquire a user group identifier of the home base station cell by using a broadcast message of the home base station cell.

The method according to any one of claims 8 to 10, wherein the neighboring cell is a macro cell, or/and a home base station cell.

12. A device for selecting a mobile terminal cell in a home base station cell, comprising: an obtaining unit, a comparing unit, a camping unit, and a reselecting unit, wherein:

An acquiring unit, configured to request access to a closed mode home base station cell after the mobile terminal is powered on Obtaining, by the closed mode home base station cell broadcast message, a user group identifier of the closed mode home base station cell;

a camping unit, configured to continue to camp on the home base station cell;

The apparatus according to claim 12, wherein the reselecting unit calculates at least one of a signal strength of the searched neighboring cell, a carrier-to-interference ratio of the channel, and a distance between the mobile terminal and the base station. Condition, selecting a cell with better communication conditions to perform camping according to the at least one communication condition.

The system according to claim 12 or 13, wherein the neighboring cell is a macro cell, or/and a home base station cell.