WO2013004047A1

WO2013004047A1 - Cell selection method and terminal

Info

Publication number: WO2013004047A1
Application number: PCT/CN2011/079550
Authority: WO
Inventors: 郑宏涛; 尚江峰; 高夕玲; 陆大明; 张佳妮
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-07-06
Filing date: 2011-09-09
Publication date: 2013-01-10
Also published as: CN102869050A

Abstract

Provided are a cell selection method and terminal, the method comprising: a terminal obtains the information of a neighboring cell; the terminal determines that the obtained information of the neighboring cell includes the cell information of a second access network; the terminal filters the neighboring cell for a cell corresponding to the cell information of the second access network, and selects a target cell from the filtered neighboring cell during cell reselection or handover. The technical solution of the present invention solves the technical problems of call dropping or abnormal data disconnection in relevant art caused by the handover between systems in certain situations (for example, when the terminal roams from a first access network to the second access network), thus avoiding call dropping or abnormal data disconnection by the handoff between systems, and effectively improving user experience.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method and a terminal for cell selection. BACKGROUND In general, when a first operator (PLMN1) and a second carrier (PLMN2) sign a roaming agreement,

The user of the PLMN1 can register to the network of any access technology of the PLMN2, and the user of the PLMN1 registers with the access technology of the lj PLMN2 (for example: Global System for Mobile Communication (GSM)) When the terminal switches or reselects other access technologies to the operator PLMN2 according to the signal quality of the current serving cell and the neighboring cell (for example, Wideband Code Division Multiple Access (WCDMA)) ) on the network. With the rapid development of the mobile communication market, new operators are constantly appearing, but the upfront investment required for mobile communication systems is very large. If the network is to be fully deployed, it will consume a lot of money and manpower, so it is difficult to The network construction is very complete. In order to solve this problem, some emerging operators will find a other operator as a partner in the early stage. In places where their network coverage is not available, users can use the partner network, and there are many ways of cooperation between them. It is implemented by means of International Mobie Subscriber Identity (IMSI), and some are implemented by signing a roaming agreement, and so on. When the implementation is implemented by signing a roaming agreement, sometimes the result is that the user of one emerging operator can only roam to the network of another access technology of another carrier, and cannot roam to other access technologies. network of. This will introduce a problem. We first assume that the operator PLMN1 and the operator PLMN2 have a roaming agreement. The user of the PLMN1 can roam to the network of the access technology (Radio access technology, RAT for short) 1 of the PLMN2, and the PLMN2 has Network for Access Technology 1 (RATI) and Access Technology 2 (RAT2). In this way, when the user of PLMN1 roams to the RATI of PLMN2, the neighbor cell information set by the RATI network may contain the cell information of RAT2, so that the user may reselect or switch to the network of RAT2, but in registration Or, when authenticating, RAT2 will reject the user again, and there is a possibility that the call may be dropped or the data link may be disconnected. In view of the above problems in the related art, an effective solution has not yet been proposed. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a method and a terminal for cell selection, to solve at least the above problems.

According to an aspect of the present invention, a method for cell selection is provided, including: acquiring, by a terminal, neighbor cell information; determining, by the terminal, that the acquired neighbor cell information includes cell information of a second access network; and the terminal from its neighboring cell The cell corresponding to the cell information is filtered, and when performing cell reselection or handover, the terminal selects the target cell from the filtered neighboring cells. Before the foregoing terminal acquires the information about the neighboring cell, the method further includes: determining, by the terminal, roaming from the first access network of the first operator currently used to the second access network of the second operator. When the terminal determines that the first operator and the second operator are different, the method further includes: determining, by the terminal, that the first operator is different from the second operator; and/or determining that the terminal prohibits the terminal from accessing the second access network. The filtering, by the terminal, the cell corresponding to the cell information from the neighboring cell includes: deleting, by the terminal, the cell corresponding to the cell information from the neighbor cell list. The selecting, by the terminal, the target cell from the filtered neighboring cell, includes: the terminal measuring, by deleting, the signal quality of the neighboring cell in the neighbor cell list and the current serving cell of the terminal after deleting the cell corresponding to the cell information; When the quality reaches the preset condition, the terminal selects to delete the neighboring cell in the neighbor cell list after the cell corresponding to the cell information, and performs cell reselection or handover. According to another aspect of the present invention, a terminal is provided, including: an obtaining module, configured to acquire neighboring cell information; and a determining module, configured to determine that the acquired neighboring cell information includes cell information of the second access network; The filtering module is configured to filter the cell corresponding to the cell information from the neighboring cell of the terminal, and the selecting module is configured to select the target cell from the filtered neighboring cells when performing cell reselection or handover. The determining module is further configured to determine to roam from the first access network of the first operator currently in use to the second access network of the second operator. The determining module is further configured to determine that the first operator is different from the second operator; and/or determine to prohibit the terminal from accessing the second access network. The filtering module is configured to delete a cell corresponding to the cell information from its neighbor cell list. The foregoing selecting module includes: a measuring unit, configured to measure a signal quality of a neighboring cell in a neighboring cell list and a current serving cell of the terminal after deleting a cell corresponding to the cell information; selecting a unit, setting To select a neighboring cell in the neighbor cell list after deleting the cell corresponding to the cell information, the cell reselection or handover is performed when the signal quality reaches the preset condition. The present invention adopts a technical solution for filtering neighbor cell information acquired by a terminal and selecting a target cell from the filtered neighboring cells, and solves the related art, in some cases (for example, the terminal is in the first When the access network roams to the second access network, technical problems such as dropped calls or abnormally disconnected data connections due to handover between systems, thereby avoiding disconnection of data connections due to dropped calls caused by inter-system handover The effect is more effective in improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 is a flowchart of a method for cell selection according to an embodiment of the present invention; FIG. 2 is a structural block diagram of a terminal according to an embodiment of the present invention; and FIG. 3 is a schematic structural diagram of a terminal according to a preferred embodiment of the present invention. 4 is a schematic flow chart of an inter-system limit switching of a mobile terminal according to a preferred embodiment 2 of the present invention; FIG. 5 is a flow chart showing an inter-system handover restriction according to a preferred embodiment 2 of the present invention; A schematic structural diagram of a system for cell selection in Embodiment 3. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. 1 is a flow chart of a method of cell selection in accordance with an embodiment of the present invention. As shown in FIG. 1 , the method includes: Step S102: The terminal acquires neighbor cell information, that is, acquires neighbor cell information of a cell where the terminal is currently located; in actual application, the first operator and the second operator may be the same, or different. Step S104: The terminal determines that the acquired neighbor cell information includes cell information of the second access network. Step S106: The terminal filters the cell corresponding to the cell information of the second access network from the neighboring cell, and when performing cell reselection or handover, the terminal selects the target cell from the filtered neighboring cells. Through the foregoing processing steps, regardless of whether the first carrier and the second carrier are the same, the neighbor cell information acquired by the terminal may be filtered, and the target cell is selected from the filtered neighboring cells, especially in the first carrier. When the second carrier is different from the second carrier, technical problems such as dropped calls or abnormally disconnected data connections due to handover between systems can be solved, and the technical effect of improving the user experience is achieved. Before the terminal acquires the neighboring cell information, the terminal may further include: determining, by the terminal, roaming from the first access network of the first operator currently used to the second access network of the second operator. As described above, the foregoing terminal may also run the foregoing processing process when the first carrier or the second operator is different. In this case, the terminal determines that the neighbor cell information includes the cell information of the second access network. Previously, the following process may also be included: The terminal determines that the first operator is different from the second carrier. Through the above processing, the problem that the call drop or the data connection is abnormally disconnected due to the handover between the systems occurs in the case where the first operator and the second operator are different. When the terminal determines that the first operator and the second operator are different, the following processing procedure may also be included: The terminal determines to prohibit the terminal from accessing the second access network. In this way, the preconditions of the foregoing method are limited. Only when the above conditions are met (that is, the terminal determines that the terminal is prohibited from accessing the second access network), the neighbor cell information is filtered, which can save network running resources. The foregoing terminal may implement filtering the cell corresponding to the cell information from the neighboring cell of the terminal by: the terminal deleting the cell corresponding to the cell information from the neighbor cell list. The foregoing terminal selects a target cell from the filtered neighboring cells, and may include the following process: the terminal performs signal quality on the neighboring cell in the neighbor cell list and the current serving cell in the neighbor cell list after deleting the cell corresponding to the cell information. Measurement: When the signal quality reaches the preset condition, the terminal selects to delete the neighboring cell in the neighbor cell list after the cell corresponding to the cell information, and performs cell reselection or handover. In the embodiment, a terminal is provided, which is used to implement the foregoing embodiments and preferred embodiments. The descriptions of the modules and the preferred embodiments are omitted. The modules involved in the device are described below. As used hereinafter, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the terminals described in the following embodiments are preferably implemented in software, hardware, or a combination of software and hardware, is also possible and conceivable. 2 is a structural block diagram of a terminal according to an embodiment of the present invention. As shown in FIG. 2, the terminal includes: an obtaining module 20, configured to acquire neighbor cell information; The determining module 22 is connected to the obtaining module 20, and is configured to determine that the acquired neighboring cell information includes cell information of the second access network. The filtering module 24 is connected to the determining module 22, and is configured to be filtered from the neighboring cell of the terminal. a cell corresponding to the cell information of the second access network; the selecting module 26 is connected to the filtering module 24, and is configured to select the target cell from the filtered neighboring cells when performing cell reselection or handover. Preferably, the determining module 22 is further configured to determine to roam from the first access network of the first operator currently in use to the second access network of the second operator. Preferably, the determining module 22 is further configured to determine that the first operator and the second operator are different; and/or determine that the terminal is prohibited from accessing the second access network. Preferably, the filtering module 24 is configured to delete the cell corresponding to the cell information from the neighbor cell list. In a preferred embodiment of the present invention, as shown in FIG. 3, the foregoing selecting module 26 includes: a measuring unit 260, configured to set a neighboring cell and a terminal in a neighbor cell list after deleting a cell corresponding to the cell information. The signal quality of the current serving cell is measured; the selecting unit 262 is configured to: when the signal quality reaches the preset condition, select to delete the neighboring cell in the neighbor cell list after the cell corresponding to the cell information, and perform cell reselection or switching. . In order to better understand the above embodiments, the following description will be made in conjunction with the preferred embodiments. The following preferred embodiments incorporate the above-described embodiments and preferred embodiments thereof. In the following preferred embodiment, we first assume that the first operator PLMN1 and the second operator PLMN2 sign a roaming agreement, the user of PLMN1 can roam to the network of access technology 1 (RATI) of PLMN2, and PLMN2 has access at the same time. Network for Technology 1 (RATI) and Access Technology 2 (RAT2). The above RATI and RAT2 may be GSM, CDMA, CDMA2000, WCDMA, or the like. Preferred Embodiment 1 This embodiment provides a method for implementing a terminal to selectively restrict inter-system handover. Specifically, when the terminal registers with the SIM/USIM card of the operator PLMN1 to the network of the access technology A of the operator PLMN2, it cannot reselect or switch to the network of the access technology B of the operator PLMN2; Other operators When the SIM/USIM card or the terminal registers with the SIM/USIM card of the operator PLMN1 to other networks other than the operator PLMN2, the terminal can perform inter-system handover or reselection. In order to achieve the above purpose, the protocol stack of the terminal needs to be modified appropriately, and an adjacent cell filtering module is added on the basis of the original protocol. When the terminal registers with the network and obtains neighbor cell information, the neighboring cell filtering module Do the appropriate filtering. When registering to the network where the access technology is RATI, if it is detected that the RATI network is configured with information of the neighboring cell, the terminal needs to properly filter the neighboring cell information. First, the terminal checks whether the currently used SIM/USIM card is The SIM/USIM card of PLMN1, if not, the terminal does not need to filter the neighbor cell information. If yes, the terminal checks whether the currently registered network is PLMN2. If yes, the terminal associates the RAT2 in the neighboring cell configured by the RATI network. The cell is filtered out so that the terminal does not reselect or switch to the cell of RAT2. In general, the network sends the reselected cell information and the switched cell information to the terminal respectively. Therefore, in these two places, the terminal needs to perform cell information filtering. In addition, before the terminal leaves the factory, the information of the PLMN1, the PLMN2 and the RAT that cannot be registered needs to be recorded in the non-volatile (NV) of the terminal, and the terminal can pass the user interface in order to facilitate subsequent changes in the network setting. (User Interface, referred to as UI) Modify these parameters. The foregoing embodiment optimizes the prior art to prevent the user from being dropped or the data connection is abnormally disconnected due to handover between systems in some cases, thereby effectively improving the user experience. Preferred Embodiment 2 In this embodiment, a flow before the system is restricted between handovers of the mobile terminal will be described first with reference to FIG. As shown

4, the process includes: Step S402: The mobile terminal is powered on, and the terminal searches for an available cell according to its own capability. Here, we assume that the terminal searches for an available cell of the RATI. Step S404: After searching for the cell, the terminal first reads the broadcast information and performs an appropriate access restriction check. If the cell does not restrict user access, the terminal performs a registration process. Step S406: After the registration is completed, the mobile terminal reads the neighbor cell information from the broadcast message, and periodically detects the signal quality of the current serving cell and the neighboring cell. When the signal quality of the neighboring cell reaches the switching condition, the terminal The switching process will take place. Step S408: It is checked whether the neighboring cell of RAT2 is better than the current serving cell. If yes, the operation of step S410 is performed. If not, the process returns to step S406 to continue detecting the signal quality of the serving cell and the neighboring cell. Step S410: The mobile terminal performs location update and routing update under RAT2. Then, the flow of the inter-system handover restriction according to the present embodiment will be described with reference to FIG. As shown in FIG. 5, the process includes: Step S502: The mobile terminal is powered on, and the terminal searches for an available cell according to its own capability. In this embodiment, it is assumed that the terminal searches for an available cell of the RATI. Step S504: After searching for the cell, the terminal first reads the broadcast information, and performs an appropriate access restriction check. If the cell does not restrict user access, the terminal performs a registration process. Step S506: After the registration is completed, the mobile terminal reads the neighbor cell information from the broadcast message. Step S508: The terminal checks whether the currently used SIM/USIM card belongs to PLMN1. If not, it jumps to step S514 to perform normal cell reselection, and if yes, proceeds to the next operation. Step S510: It is checked whether the currently registered network is the RATI network of the PLMN2. If not, the process goes to step S514 to continue, and if yes, the next operation is continued. Step S512: Delete the neighboring cell related to RAT2 from the neighbor cell list. Step S514: Perform measurement on the neighboring cell and the current serving cell by using the current neighbor cell list, and perform cell reselection if the cell reselection criterion is reached. Preferred Embodiment 3 This embodiment provides a system for cell selection to implement the above preferred embodiment. As shown in FIG. 6, the system includes: an information acquiring module 60: the module is a module in the prior art, and after the terminal registers with the network, acquires information of a neighboring cell from a network broadcast message or a measurement control message, for Terminal measurement. The information filtering module 62: the module is an adding module of the embodiment, which reads the relevant filtering condition from the configuration information of the terminal, and then the information according to the access technology of the terminal registration network and the currently used SIM/USIM card. The neighboring cell information acquired by the obtaining module 60 is filtered, and then the filtered cell information is sent to the cell measurement module 64. The cell measurement module 64: The module is a module in the prior art, and obtains the filtered neighboring cell from the information filtering module 62 to perform neighbor cell measurement. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

1. A method of cell selection, comprising:

The terminal acquires neighbor cell information;

Determining, by the terminal, that the obtained neighbor cell information includes cell information of the second access network; the terminal filtering, by the neighboring cell, a cell corresponding to the cell information of the second access network, When performing cell reselection or handover, the terminal selects a target cell from the filtered neighboring cells.

The method according to claim 1, wherein before the acquiring the neighbor cell information, the terminal further includes:

The terminal determines to roam from the first access network of the first operator currently in use to the second access network of the second operator.

The method according to claim 2, wherein, when the terminal determines that the first operator and the second operator are different, the method further includes:

The terminal determines that the first operator is different from the second operator; and/or

The terminal determines to prohibit the terminal from accessing the second access network.

The method according to any one of claims 1 to 3, wherein the filtering, by the terminal, a cell corresponding to the cell information from a neighboring cell, includes:

The terminal deletes the cell corresponding to the cell information from its neighbor cell list.

The method according to claim 4, wherein the selecting, by the terminal, the target cell from the filtered neighboring cells includes:

The terminal measures the signal quality of the neighboring cell in the neighbor cell list and the current serving cell of the terminal after deleting the cell corresponding to the cell information;

When the signal quality reaches a preset condition, the terminal selects a neighboring cell in the neighbor cell list after deleting the cell corresponding to the cell information to perform cell reselection or handover.

6. A terminal comprising:

Obtaining a module, configured to acquire neighbor cell information; a determining module, configured to determine that the obtained neighbor cell information includes cell information of the second access network;

a filtering module, configured to filter a cell corresponding to the cell information of the second access network from a neighboring cell of the terminal;

The selecting module is configured to select a target cell from the filtered neighboring cells when performing cell reselection or handover. The terminal according to claim 6, wherein the determining module is further configured to determine to roam from a first access network of a first operator currently in use to a second access network of a second operator. The terminal according to claim 6, wherein the determining module is further configured to determine that the first operator and the second operator are different; and/or determine to prohibit the terminal from accessing the second Access to the network. The terminal according to any one of claims 6 to 8, wherein the filtering module is configured to delete a cell corresponding to the cell information from a list of neighboring cells. The terminal according to claim 9, wherein the selecting module comprises: a measuring unit, configured to set a neighboring cell and the terminal in the neighbor cell list after deleting the cell corresponding to the cell information The signal quality of the current serving cell is measured;

The selecting unit is configured to: when the signal quality reaches a preset condition, select a neighboring cell in the neighbor cell list after deleting the cell corresponding to the cell information, and perform cell reselection or switching.