CN101925142A

CN101925142A - Cell switching control method, network equipment and system

Info

Publication number: CN101925142A
Application number: CN2009101483874A
Authority: CN
Inventors: 张宏平; 邢平平; 郭轶; 谢明江; 黄敏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2009-06-17
Filing date: 2009-06-17
Publication date: 2010-12-22
Anticipated expiration: 2029-06-17
Also published as: CN101925142B

Abstract

The invention discloses a cell switching control method, network equipment and a system, which relate to the technical field of communication, can ensure that a terminal is switched to a proper cell and avoid dropped call of the terminal, do not affect normal test of the cell and ensure the normal work of a cell retention mechanism. The cell switching control method provided by the embodiment of the invention comprises the following steps of: acquiring switching judgment information required when the terminal is switched to a target cell, wherein the switching judgment information comprises public local mobile network (PLMN) information of the terminal; and controlling the switching from the terminal to the target cell according to the switching judgment information. The method is suitable for the scenes which need to control cell switching.

Description

Cell switching control method, network equipment and system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a cell switching control method, a network device, and a system.

Background

With the development of mobile communication technology, the quality of service that a mobile communication system can provide is higher and higher. The 3rd Generation Partnership Project (3 GPP) is continuously working on the establishment and perfection of the Long Term Evolution (LTE) standard in order to maintain the long term competitive advantage.

In order to provide different services for different users, in the prior art, when each user signs up to Access a system, a corresponding Access Class (AC) and a home Public Land Mobile Network (PLMN) are determined for the user. For example, common access classes for common users include AC0 through AC9, whose access rights apply to the home PLMN and the visited PLMN.

The special access classes for special users include AC11 to AC15, wherein AC11 and AC15 can be allocated as management for PLMNs, PLMN personnel, etc., and the access rights thereof are applicable only to the home PLMN; AC12, AC13 and AC14, which may be assigned for security, utility (e.g. water, gas supply, etc.) and emergency services applications, etc., the access rights of which are applicable in the region of the country to which the home PLMN belongs. A particular user may have both a common access class and one or more special access classes.

During testing at the initial deployment of the base station, or during emergency maintenance after network failure, the operator may set cell access restriction, for example, the state of the corresponding cell may be set to a Reserved (Reserved) state, and the Reserved cell is only used by PLMN users of the operator (such as users of AC11 and AC 15) and is not opened for other users (including PLMN users of other operators with AC11 and/or AC15 grades), so as to avoid affecting services of normal users and reduce the impact on testing.

However, there are many problems in the prior art, for example, when a connected user needs to handover to a certain PLMN of a target cell and the target cell under the PLMN is in a reserved state, all users with AC11 and AC15 are allowed to handover to the target cell under the PLMN, including users not belonging to the PLMN, but since the target cell under the PLMN is in a reserved state, the target cell under the PLMN cannot provide services for users of AC11 and AC15 under other PLMNs, which is contrary to the definition of access rights for users of AC11 and AC15, so that some users may be handed over to the cell by mistake, call drop is caused, and normal test of the cell may be greatly affected.

Disclosure of Invention

In order to solve the problems in the prior art, embodiments of the present invention provide a cell handover control method, a network device, and a system.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

a method of controlling cell handover, the method comprising:

acquiring switching judgment information required when a terminal is switched to a target cell, wherein the switching judgment information comprises the information of a Public Land Mobile Network (PLMN) to which the terminal belongs;

and controlling the switching of the terminal to the target cell according to the switching judgment information.

A network device, the network device comprising:

an obtaining unit, configured to obtain handover decision information required when a terminal is handed over to a target cell, where the handover decision information includes home public land mobile network PLMN information of the terminal, or the handover decision information includes home PLMN information of the terminal, and test terminal indication information indicating whether the terminal is a test terminal of a corresponding cell and/or access class information of the terminal;

and the switching control unit is used for controlling the switching of the terminal to the target cell according to the switching judgment information acquired by the acquisition unit.

A communication system comprises the network equipment.

According to the technical scheme provided by the embodiment of the invention, by acquiring the home PLMN information of the terminal, when the terminal is switched to the target cell, whether the terminal is allowed to be switched to the target cell can be judged according to the home PLMN information of the terminal, so that the problem caused by that part of users are switched to the target cell by mistake due to the fact that judgment cannot be carried out according to the PLMN information when the target cell is in a reserved state in the prior art is solved. The technical scheme of the embodiment of the invention can ensure that the terminal is switched to a proper cell, avoid the call drop of the terminal and does not influence the normal test of the cell, thereby ensuring the normal work of a cell reservation mechanism.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a flowchart of a cell handover control method according to an embodiment of the present invention;

fig. 2 is a flowchart of a cell handover control method according to a second embodiment of the present invention;

fig. 3 is a flowchart of a method for a source access network element to obtain a PLMN ID of a terminal according to a second embodiment of the present invention;

fig. 4 is a flowchart of another method for a source access network element to obtain a terminal home PLMN ID according to the second embodiment of the present invention;

fig. 5 is a flowchart of another method for a source access network element to obtain a terminal home PLMN ID according to the second embodiment of the present invention;

fig. 6 is a flowchart of another method for a source access network element to obtain a terminal home PLMN ID according to the second embodiment of the present invention;

fig. 7 is a flowchart of a processing method for a source access network element to control cell switching according to switching decision information according to a second embodiment of the present invention;

fig. 8 is a flowchart of a method for acquiring handover decision information by a target access network element according to a third embodiment of the present invention;

fig. 9 is a flowchart of another method for acquiring handover decision information by a target access network element according to a third embodiment of the present invention;

fig. 10 is a schematic structural diagram of a network device according to a fourth embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An embodiment of the present invention provides a method for controlling cell handover, as shown in fig. 1, which mainly includes the following steps:

step S1: acquiring switching judgment information required when a terminal is switched to a target cell, wherein the switching judgment information comprises the information of a home Public Land Mobile Network (PLMN) of the terminal;

step S2: and controlling the terminal to switch to the target cell according to the switching judgment information.

In the embodiment of the present invention, a case where a mobile terminal in a connected state, such as a mobile phone, is switched from a source cell to a target cell is mainly described. But is not limited to this and is applicable to any scenario where a cell switch is made.

In this embodiment, the terminal may be controlled to switch to the target cell by using the obtained handover decision information at the source network side; and the switching of the terminal to the target cell can be controlled by utilizing the acquired switching judgment information at the target network side. The specific manner of acquiring the handover decision information may be referred to in the following related description.

The handover decision information includes home PLMN information of the terminal, and the description is mainly given with respect to a case where the home PLMN information is a home PLMN Identifier (ID), but the handover decision information is not limited to this, and may be other information indicating the home PLMN information of the terminal. The handover decision information may also include test terminal indication information to indicate whether the terminal is a test terminal of a corresponding reserved cell, and/or the access class of the terminal, the state of the target cell, and any information required for controlling cell handover. The test terminal is a terminal for testing a network, and may be a terminal that provides a service only to the test terminal when a cell is in a reserved state during a test at an initial network deployment stage or during network emergency maintenance, and is not open to other terminals.

It should be noted that in the case of network sharing, the target cell may belong to multiple PLMNs, but when the terminal performs cell handover, the terminal only performs cell handover to the target cell under one of the PLMNs, where "the state of the target cell" refers to the state of the target cell under the selected PLMN. The state of the target cell may be a reserved state or a normal state. The same description applies in relation to the following.

According to the technical scheme provided by the embodiment of the invention, by acquiring the home PLMN information of the terminal, when the terminal is switched to the target cell, whether the terminal is allowed to be switched to the target cell can be judged according to the home PLMN information of the terminal, so that the problem that in the prior art, when the target cell is in a reserved state, part of users are mistakenly switched to the target cell due to the fact that judgment cannot be carried out according to the PLMN information is solved. The technical scheme of the embodiment of the invention can ensure that the terminal is switched to a proper cell, and avoid the terminal from dropping calls; and the normal test of the cell is not influenced, thereby ensuring the normal work of the cell reservation mechanism.

The second embodiment of the present invention mainly explains the case of implementing the cell reserving mechanism on the source network side. The cell switching control method provided by the second embodiment of the present invention mainly includes the following processing:

step T1: the source access network element acquires switching judgment information required when the terminal is switched to the target cell.

A source access network element, such as a source base station, acquires handover decision information, which may include a home PLMN ID of a terminal, a state of a target cell, an access class of the terminal, and/or test terminal indication information, to indicate whether the terminal is a test terminal of a corresponding reserved cell. As shown in fig. 2, includes:

step T11: the source base station acquires the state of the target cell.

When a cell starts to be used and the cell state changes, the base station to which the cell belongs notifies the neighboring base station of its own cell state information. The source base station can know the state of the target cell (such as whether the target cell is in a reserved state) according to the cell state information.

Step T12: and the source base station acquires the home PLMN ID of the terminal, the access grade of the terminal or the indication information of the test terminal.

When a terminal initiates a service, a source base station acquires access grade information of the terminal and a PLMNID to which the terminal belongs. Or, the source base station acquires the test terminal indication information of the terminal and the PLMN ID to which the terminal belongs. Or, the source base station acquires the access level information and the test terminal indication information of the terminal and the PLMNID to which the terminal belongs.

Here, the access class information of the terminal and the test terminal indication information may be two kinds of information having equivalent functions, and whether the corresponding reserved cell can provide a service for the terminal can be known according to any one of the two kinds of information. That is, the terminal may be divided into different access classes to indicate the access capability of the terminal, for example, for terminals with access classes 11 and 15, the terminal may access to corresponding cells; or, instead of assigning an access class to the terminal, the test terminal indication information may be directly used to indicate whether the terminal can access to the corresponding cell. Obviously, the access level information and the test terminal indication information may be used to indicate the access right of the terminal.

The following description mainly describes a method for a source base station to obtain a PLMN ID to which a terminal belongs, access level information of the terminal, and/or test terminal indication information, which at least may include the following modes:

in a first mode

As shown in fig. 3, the source base station obtains the PLMN ID to which the terminal belongs, and tests the terminal indication information and/or the access class information of the terminal through the source core management network element.

In the LTE system, the source base station may be an evolved node b (eNB), the source core management network element may be a Mobility Management Entity (MME), and the source core management network element obtains a PLMN ID to which the terminal belongs, and sends the PLMN ID to which the terminal belongs, the test terminal indication information, and/or the access class information of the terminal to the source access network element after testing the terminal indication information and/or the access class information of the terminal.

Specifically, in LTE, the MME sends, through an S1 interface message, a PLMN ID to which the terminal belongs, test terminal indication information, and/or access class information of the terminal to the eNB, where the S1 interface message may be an Initial Context Setup Request (Initial Context Setup Request) message or another message sent through an S1 interface.

Referring to fig. 3, the MME may obtain the PLMN ID to which the terminal belongs by:

1 a: in the process of terminal registration (attach), the MME acquires a PLMN ID to which the terminal belongs from a subscriber server (HSS), and the access class information of the terminal and the home PLMN ID are stored in the HSS or in another server of the core network as part of the subscription information, that is, the MME may acquire the PLMN ID to which the terminal belongs from a server in which the PLMN ID to which the terminal belongs is stored.

1 b: the MME parses the saved global Mobile Subscriber Identity (IMSI) of the terminal to obtain the PLMN ID to which the terminal belongs.

And the eNB stores the received PLMN ID of the terminal attribution from the MME for judging the cell switching.

Further, the MME may obtain the test terminal indication information by:

the MME obtains the test terminal indication information according to the access class information of the terminal, and the MME may obtain the test terminal indication information according to the access class information allocated to the terminal, for example, when the access class of the terminal is 11 or 15, the obtained test terminal indication information indicates that the terminal is a test terminal of a corresponding cell.

Or, the MME acquires test terminal indication information from the user subscription server during the registration process of the terminal, and the test terminal indication information is stored in the user subscription server as a part of the subscription information.

Mode two

And the source base station acquires the PLMN ID to which the terminal belongs through the terminal, and tests the terminal indication information and/or the access grade information of the terminal.

Referring to fig. 4, the eNB may obtain the PLMN ID to which the terminal belongs, test the terminal indication information and/or the access class information of the terminal by:

after obtaining the PLMN ID to which the terminal belongs, the terminal tests the terminal indication information and/or the terminal access class information, and then sends the PLMN ID to which the terminal belongs to the eNB through a Radio Resource Control-connection (RRC) dedicated signaling message.

The terminal can obtain the PLMN ID and/or the test terminal indication information which are saved by the SIM/USIM card and to which the terminal belongs, and send the PLMN ID and/or the test terminal indication information to the eNB, for example, in the RRC connection establishment process, the terminal sends the PLMN ID to which the terminal belongs to the eNB through an RRC connection establishment completion message;

or, the SIM/USIM card of the terminal stores the IMSI of the terminal, and the terminal parses the IMSI to obtain the PLMN ID to which the terminal belongs, and then the terminal sends the PLMN ID to which the terminal belongs to the eNB through an RRC dedicated signaling message.

Or the terminal obtains the test terminal indication information of the terminal by analyzing the stored access grade information of the terminal.

And the eNB stores the received PLMN ID to which the terminal belongs for judging cell switching.

Mode III

And taking the PLMN ID to which the terminal belongs, the test terminal indication information and/or the access grade information of the terminal as one of the terminal access capabilities, and carrying the PLMN ID, the test terminal indication information and/or the access grade information in the terminal access capability information. In the terminal registration process, the MME acquires the access capability information of the terminal, and in the initial context establishment process, the MME sends the access capability information of the terminal to the base station, so that the PLMN ID to which the terminal belongs is brought to the source base station.

Referring to fig. 5, the eNB may obtain the PLMN ID to which the terminal belongs, and test the terminal indication information and/or the access class information of the terminal in the following manner, specifically including:

1. the terminal acquires the PLMN ID to which the terminal belongs, and tests the terminal indication information and/or the access grade information of the terminal.

The method for the terminal to obtain the PLMN ID to which the terminal belongs, and test the terminal indication information and/or the terminal access level information may refer to the description of the related contents in the mode two, for example, the terminal obtains the PLMN ID to which the terminal belongs stored in the SIM/USIM card, tests the terminal indication information and/or the terminal access level information, or the terminal resolves the PLMN ID to which the terminal belongs from the IMSI stored in the SIM/USIM card.

2. And adding the PLMN ID information of the terminal, and testing the indication information of the terminal and/or the access grade information of the terminal in the terminal capability information. In the terminal registration process, the terminal brings the terminal access Capability Information to the eNB through a terminal Capability Information (UE Capability Information) message.

3. The eNB further brings the terminal access Capability information to the MME through a terminal Capability information indication (UE Capability information identification) message.

4. In the initial context establishing process, through the initial context establishing request message, the MME brings the terminal home PLMN ID, the test terminal indication information and/or the access grade information of the terminal carried in the capability information to the eNB.

5. The eNB stores the home PLMN ID of the terminal, test terminal indication information and/or access class information of the terminal for cell handover decision.

The three ways of acquiring the switching decision information by the source access network element can be applied to the scene that the terminal in an idle state initially accesses the network, and when the terminal which has accessed the network switches among different cells, other ways can be adopted to acquire the switching decision information. For example, after the source access network element control terminal is switched to the target access network element through the following step T2, the target access network element is the source access network element at the time of the next cell switching, and the target access network element needs to acquire the handover decision information to perform the next cell switching, and at this time, the target access network element may acquire the handover decision information in the following manner:

mode IV

In the cell switching process, or after the switching is completed, the source access network element receives the switching decision message sent by the last source access network element of the terminal through an X2 interface message or an S1 interface message. That is, the current target access network element (the source access network element for the next handover) receives the handover decision message sent by the current source access network element through the X2 interface message or the S1 interface message. The specific processing of this mode is shown in fig. 8 and 9.

Mode five

In the process of cell switching or after switching is completed, a target access network element (source access network element for next switching) receives switching judgment information sent by a terminal through a special message. For example, as shown in fig. 6, the terminal sends a handover complete message, which may be an RRC connection reconfiguration complete message in the LTE system. The handover completion message carries the handover decision information.

The target access network element stores the switching judgment information for judging the next cell switching.

Step T2: and the source access network element controls the switching of the terminal to the target cell according to the switching judgment information.

The control processing may be executed after the source access network element receives the measurement report, as shown in step T21 in fig. 2, where the source access network element determines whether to allow the terminal to switch into the target cell according to the handover decision information, and if the terminal is allowed to switch into the target cell, the terminal may be switched into the target cell, and if the terminal is not allowed to switch into the target cell, another cell may be selected for handover; as shown in step T22 in fig. 2, the method may also be performed when the source access network element issues measurement control, and if the terminal is not allowed to be switched into the target cell, the target cell is listed in a blacklist measured by the terminal when the measurement control is issued, so that the terminal does not measure the target cell, thereby ensuring that the terminal is switched to a suitable cell, avoiding a call drop of the terminal, and not affecting normal test of the cell, and ensuring normal operation of a cell reservation mechanism.

As shown in fig. 7, a processing method for a source access network element (base station) to control cell handover according to handover decision information according to a second embodiment of the present invention is described below.

1. A base station acquires switching judgment information, wherein the switching judgment information can comprise a PLMN ID to which a terminal belongs, an access grade of the terminal and a cell state of a target cell; or the handover decision information may include a PLMN ID to which the terminal belongs, test terminal indication information, and a cell state of the target cell.

2. And the base station judges whether the state of the PLMN to which the switched target cell belongs is a reserved state. If not, the decision is not restricted and the handover is allowed.

3. And if the state of the PLMN to which the target cell belongs is the reserved state, further judging whether the terminal has the access grade of AC11 and/or AC15, and if not, judging to be limited and not allowing the handover. If yes, entering step 4;

or, if the state of the PLMN to which the target cell belongs is the reserved state, further determining whether the test terminal indication information indicates that the terminal is a test terminal of the target cell, if so, entering step 4, if not, determining to be limited, and not allowing handover.

4. The base station further judges whether the PLMN information to which the terminal belongs is consistent with the PLMN to which the target cell belongs according to the acquired PLMN ID to which the terminal belongs, and if so, the judgment is not limited and the switching is allowed; if not, the decision is limited and no handover is allowed.

The execution order of the steps shown in fig. 7 is not limited, and may be specifically adjusted as necessary. For example, it may first determine whether a PLMN to which the terminal belongs is consistent with a PLMN to which the target cell belongs, and if so, determine whether the PLMN to which the target cell belongs is in a reserved state, and if not, allow the handover; if the reserved state is true, the terminal with the AC11 and/or AC15 access class is allowed to switch to the target cell, or the test terminal is allowed to switch to the target cell. When the PLMN to which the terminal belongs is not consistent with the PLMN to which the target cell belongs, judging whether the PLMN to which the target cell belongs is in a reserved state, and if not, allowing switching; if the cell is in the reserved state, the handover to the target cell is not allowed.

In the second embodiment of the present invention, after the source base station controls the terminal to switch to the target base station, the target base station also needs to acquire the handover decision information, and the specific processing method refers to the fourth mode and the fifth mode in the second embodiment of the present invention.

The third embodiment of the present invention mainly explains the case of implementing the cell reserving mechanism on the target network side. The cell switching control method provided by the third embodiment of the present invention mainly includes the following processing:

step V1: the target access network element acquires switching judgment information required when the terminal is switched to a target cell, wherein the switching judgment information comprises home PLMN information of the terminal.

The target access network element, such as a target evolved base station (eNB), may obtain the handover decision information in the following manner:

in a first mode

And the target eNB acquires the switching judgment information through the source eNB.

As shown in fig. 8, the source eNB sends handover decision information, such as a home PLMN ID of the terminal, an access class of the terminal and/or test terminal indication information, to the target eNB through an X2 interface message in a handover preparation phase, where the X2 interface message may be a handover request message. The target eNB stores the target handover information for use in the decision of cell handover.

Mode two

As shown in fig. 9, the source eNB sends an S1 interface message to the MME, where the S1 interface message carries the handover decision information, and the MME forwards the received S1 interface message to the target eNB, where the S1 interface message may be a handover request message. The target eNB stores the target handover information for use in the decision of cell handover.

Step V2: and the target access network element controls the switching of the terminal to the target cell according to the switching judgment information.

The target eNB controls the handover of the terminal to the target cell according to the PLMN ID to which the terminal belongs, the access level of the terminal and/or the test terminal indication information, and the cell state of the target cell, and the specific processing method is as shown in fig. 7.

An embodiment of the present invention provides a network device, as shown in fig. 10, where the network device includes:

an obtaining unit 101, configured to obtain handover decision information required when a terminal is handed over to a target cell, where the handover decision information includes home PLMN information of the terminal, or the handover decision information includes home PLMN information of the terminal, and test terminal indication information indicating whether the terminal is a test terminal of a corresponding cell and/or access class information of the terminal;

and a handover control unit 102 configured to control handover of the terminal to the target cell according to the handover decision information acquired by the acquisition unit 101.

The network device may be located at a source network side or a target network side.

When the network device is located on the source network side and the network device acquires the home PLMN information of the terminal, the acquiring unit 101 further includes:

an information receiving module, configured to receive handover decision information, which is sent by a source core management network element through an S1 interface message and is obtained by the source core management network element; or receiving switching judgment information which is sent by a terminal through an RRC dedicated signaling message and is obtained by the terminal; or, receiving the handover decision information obtained by the terminal and sent by the terminal through the terminal capability information, or receiving the handover decision information sent by the last source access network element of the terminal through the X2 interface message or the S1 interface message.

The S1 interface message is an initial context setup request message, and the RRC dedicated signaling message is an RRC connection setup complete message or a handover complete message.

When the network device is located at the target network side, to acquire the handover decision information, the acquiring unit 101 may include:

a decision information receiving module, configured to receive the handover decision information sent by the source access network element through an X2 interface message or an S1 interface message. Optionally, the X2 interface message or the S1 interface message is a handover request message.

Further, the switching control unit 102 includes:

a determining module, configured to determine, according to the handover decision information, that the state of the PLMN to which the target cell belongs is a reserved state, and at least one of the following conditions is satisfied: the terminal is a test terminal of the target cell, or the access grade of the terminal is an access grade 11 and/or an access grade 15;

the analysis processing module is used for analyzing whether the home PLMN information of the terminal is consistent with the PLMN to which the target cell belongs, and if so, the terminal is allowed to be switched to the target cell; and if the two are not consistent, the terminal is refused to be switched to the target cell.

For example, the handover control unit 102 may first determine whether a PLMN to which the terminal belongs is consistent with a PLMN to which the target cell belongs, and if so, determine whether the PLMN to which the target cell belongs is in a reserved state, and if not, allow handover; if the reserved state is true, the terminal with the AC11 and/or AC15 access class is allowed to switch to the target cell, or the test terminal is allowed to switch to the target cell. When the PLMN to which the terminal belongs is not consistent with the PLMN to which the target cell belongs, judging whether the PLMN to which the target cell belongs is in a reserved state, and if not, allowing switching; if the cell is in the reserved state, the handover to the target cell is not allowed.

The specific working method of the device embodiment of the invention refers to the method embodiment of the invention.

The embodiment of the invention also provides a communication system which comprises the network equipment.

Those skilled in the art will readily appreciate that the present invention may be implemented in software, coupled with a general purpose hardware platform as required. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for controlling cell handover, the method comprising:

2. The cell switching control method according to claim 1, wherein the switching decision information further includes test terminal indication information indicating whether the terminal is a test terminal of a corresponding cell and/or access class information of the terminal.

3. The cell switching control method according to claim 1 or 2, wherein the obtaining of the switching decision information required when the terminal is switched to the target cell comprises:

the source access network element receives the switching judgment information which is sent by the source core management network element through the S1 interface message and is obtained by the source core management network element; or,

the source access network element receives the switching judgment information obtained by the terminal sent by the terminal through the radio resource control connection RRC dedicated signaling message; or,

a source access network element receives the switching judgment information which is sent by a terminal through terminal capability information and is obtained by the terminal; or,

and the source access network element receives the switching decision information sent by the last source access network element of the terminal through an X2 interface message or an S1 interface message.

4. The method of controlling cell switching according to claim 3,

the S1 interface message sent by the source core management network element is an initial context setup request message;

the X2 interface message or S1 interface message sent by the last source access network element of the terminal is a switching request message;

the RRC dedicated signaling message is an RRC connection setup complete message, or the RRC dedicated signaling message is a handover complete message.

5. The method of controlling cell switching according to claim 3,

the source core management network element obtains the home PLMN information of the terminal by analyzing the global mobile subscriber identity (IMSI) of the terminal, or the source core management network element obtains the home PLMN information of the terminal from a user subscription server in the registration process of the terminal;

the terminal takes the stored home PLMN information as the home PLMN information of the terminal, or the terminal analyzes the stored IMSI of the terminal to obtain the home PLMN information of the terminal;

the source core management network element obtains the test terminal indication information according to the access grade information of the terminal, or the source core management network element obtains the test terminal indication information from a user subscription server in the registration process of the terminal; and the number of the first and second groups,

and the terminal takes the stored test terminal indication information as the test terminal indication information of the terminal, or the terminal obtains the test terminal indication information of the terminal according to the stored access grade information of the terminal.

6. The method for controlling cell handover according to claim 1 or 2, wherein the method specifically comprises:

the target access network element acquires the switching judgment information required when the terminal is switched to the target cell;

and the target access network element controls the switching of the terminal to the target cell according to the switching judgment information.

7. The cell switching control method of claim 6, wherein the obtaining of the switching decision information by the target access network element comprises:

and the target access network element receives the switching decision information sent by the source access network element through an X2 interface message or an S1 interface message.

8. The method for controlling cell handover according to claim 1 or 2, wherein the controlling the handover of the terminal to the target cell according to the handover decision information comprises:

according to the switching judgment information, determining that the state of the PLMN to which the target cell belongs is a reserved state, and at least one of the following conditions is satisfied: the terminal is a test terminal of the target cell, or the access grade of the terminal is an access grade 11 and/or an access grade 15;

analyzing whether the home PLMN information of the terminal is consistent with the PLMN to which the target cell belongs, and if so, allowing the terminal to be switched to the target cell; and if the two are not consistent, the terminal is refused to be switched to the target cell.

9. A network device, characterized in that the network device comprises:

10. The network device of claim 9, wherein the obtaining unit comprises:

an information receiving module, configured to receive the handover decision information obtained by a source core management network element, where the handover decision information is sent by a source core management network element through an S1 interface message; or, receiving the switching decision information obtained by the terminal and sent by the terminal through the RRC dedicated signaling message; or, receiving the handover decision information obtained by the terminal and sent by the terminal through the terminal capability information, or receiving the handover decision information sent by the last source access network element of the terminal through the X2 interface message or the S1 interface message.

11. The network device of claim 9, wherein the obtaining unit comprises:

a decision information receiving module, configured to receive the handover decision information sent by the source access network element through an X2 interface message or an S1 interface message.

12. The network device of claim 9, wherein the handover control unit comprises:

13. A communication system, characterized in that the system comprises a network device according to any of claims 9 to 12.