CN108696888A - A kind of method and device of determining overlapping coverage cell - Google Patents

Abstract

The present application relates to the field of mobile communication technology, and in particular to a method and device for determining overlapping coverage cells, so as to provide a solution for determining overlapping coverage cells in a multi-complement scenario; the method for determining overlapping coverage cells provided by the embodiment of the present application The method includes: obtaining MRs reported by multiple UEs within the coverage of the target cell; respectively analyzing the MRs reported by each UE to obtain the signal strengths of at least two neighboring cells of the target cell; The signal strength of a neighboring cell is used to determine whether the at least two neighboring cells jointly cover the target cell. In this way, when the covered cell cannot be identified according to the geographical location of the base station in the scenario of adding one more, the target cell can be The MR reported by the UE within the coverage area obtains the signal strength of at least two neighboring cells, and then determines whether the at least two neighboring cells jointly cover the target cell according to the signal strength of each neighboring cell.

Description

A method and device for determining overlapping coverage cells

technical field

The present application relates to the field of communication technologies, and in particular to a method and device for determining overlapping coverage cells.

Background technique

Currently, multiple communication technologies such as Global System for Mobile Communications (GSM), Time Division-Synchronous Code Division Multiple Access (TDSCDMA) and Long Term Evolution (LTE) coexist. These various communication technologies jointly realize the seamless geographical coverage of communication services.

As shown in Figure 1, the coverage area of GSM base stations is more than 1 km, the coverage radius of TDSCDMA base stations is about 1 km, the coverage radius of LTE Macro base stations is 500 meters, the coverage radius of LTE Micro base stations is 200 meters, and the coverage radius of small base stations such as Pico and Femto is about 10 meters. Therefore, GSM and TDSCDMA base stations may coexist in some areas, and LTE Macro and Micro base stations may coexist in other areas.

At present, the business of major communication operators is unevenly distributed in time and space. When the entire network load is relatively low in the middle of the night, if some small base stations that supplement heat are properly shut down and macro base stations are used to carry business capacity, then The energy of shutting down the base station can be saved without affecting the communication service. The existing base station cooperative shutdown technology is to identify concentric energy-saving cells according to the geographical location of the base station, as shown in FIG. 2 . However, there are still a large number of non-concentric cells in the communication network. This coverage scenario is called a multi-complement scenario. Although these cells are not concentric, they may also be covered by two or more adjacent cells. , for this scenario, the prior art does not provide a solution on how to determine overlapping coverage cells.

Contents of the invention

Embodiments of the present application provide a method and device for determining overlapping coverage cells, which are used to provide a solution for determining overlapping coverage cells in a scenario of adding one more.

A method for determining overlapping coverage cells provided in an embodiment of the present application includes:

Acquiring measurement reports (Measure Report, MR) reported by multiple user terminals (User Equipment, UE) within the coverage of the target cell;

Respectively analyzing the MR reported by each UE to obtain the signal strength of at least two neighboring cells of the target cell;

Based on the obtained signal strength of each neighboring cell of the target cell, determine whether the at least two neighboring cells jointly cover the target cell.

A device for determining overlapping coverage cells provided in an embodiment of the present application includes:

An acquisition module, configured to acquire measurement reports MR reported by multiple user terminals UE within the coverage of the target cell;

An analysis module, configured to separately analyze the MR reported by each UE to obtain the signal strength of at least two neighboring cells of the target cell;

A common coverage judging module, configured to determine whether the at least two neighboring cells jointly cover the target cell based on the obtained signal strength of each neighboring cell of the target cell.

In the embodiment of the present application, the MRs reported by multiple UEs within the coverage of the target cell are obtained, and then the MRs reported by each UE are analyzed to obtain the signal strengths of at least two neighboring cells of the target cell, and then based on the obtained MRs of each neighboring cell Signal strength, determining whether the at least two adjacent cells jointly cover the target cell. In this way, when the covered cell cannot be identified according to the geographic location of the base station in the scenario of one more complement, the signal strength of at least two neighboring cells can be obtained based on the MR reported by the UE within the coverage of the target cell, and then the signal strength of each neighboring cell can be obtained based on the The signal strength determines whether the at least two adjacent cells jointly cover the target cell. For example, when the coverage of each adjacent cell to the target cell is relatively high, or the common coverage of all adjacent cells to the target cell is relatively high, the adjacent cell can be considered The common coverage target cell, this method of determining the common coverage cell based on the measurement report, has better feasibility and practicability.

Description of drawings

FIG. 1 is a schematic diagram of the coverage of base stations under different communication technologies in the prior art;

Fig. 2 is the schematic diagram of the concentric energy-saving residential area in the prior art;

FIG. 3 is a flowchart of a method for determining overlapping coverage cells according to an embodiment of the present application;

FIG. 4 is a flow chart of a method for determining whether neighboring cells of a target cell jointly cover the target cell based on the signal strength of each neighboring cell provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of a scenario of one more complement provided by the embodiment of the present application;

FIG. 6 is a flow chart of another method for determining overlapping coverage cells according to an embodiment of the present application;

FIG. 7 is a structural diagram of an apparatus for determining overlapping coverage cells provided by an embodiment of the present application.

Detailed ways

In the embodiment of the present application, the MRs reported by multiple UEs within the coverage of the target cell are obtained, and then the MRs reported by each UE are analyzed to obtain the signal strengths of at least two neighboring cells of the target cell, and then based on the obtained MRs of each neighboring cell Signal strength, determining whether the at least two adjacent cells jointly cover the target cell. In this way, when the covered cell cannot be identified according to the geographic location of the base station in the scenario of one more complement, the signal strength of at least two neighboring cells can be obtained based on the MR reported by the UE within the coverage of the target cell, and then the signal strength of each neighboring cell can be obtained based on the The signal strength determines whether the at least two adjacent cells jointly cover the target cell. For example, when the coverage of each adjacent cell to the target cell is relatively high, or the common coverage of all adjacent cells to the target cell is relatively high, the adjacent cell can be considered The common coverage target cell, this method of determining the common coverage cell based on the measurement report, has better feasibility and practicability.

The embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 3, the flow chart of the method for determining overlapping coverage cells provided by the embodiment of the present application includes the following steps:

S301: Obtain MRs reported by multiple UEs within the coverage of the target cell.

Wherein, the MR may be acquired only once for each UE within the coverage of the target cell.

S302: Analyze the MR reported by each UE separately, and obtain the signal strengths of at least two neighboring cells of the target cell.

S303: Based on the obtained signal strength of each neighboring cell of the target cell, determine whether at least two neighboring cells jointly cover the target cell.

Optionally, for each of the at least two neighboring cells, based on the signal strength of the neighboring cell measured by multiple UEs within the coverage of the target cell, determine the UE that is higher than the corresponding signal strength threshold of the neighboring cell form a UE set, and count the number of UEs included in the UE set, and further, calculate the common coverage of the at least two neighboring cells for the target cell according to the number of UEs included in the UE set corresponding to each neighboring cell, If the determined common coverage is not lower than the first preset threshold, it is determined that the at least two neighboring cells jointly cover the target cell; otherwise, it is determined that the at least two neighboring cells do not jointly cover the target cell.

As shown in Figure 4, in the specific implementation process, the above steps can be performed according to the following process:

S401a: For each of the at least two neighboring cells, based on the signal strength of the neighboring cell measured by multiple UEs, determine a UE set consisting of UEs that are higher than the signal strength threshold corresponding to the neighboring cell, and count the The number of UEs included in the UE set.

Optionally, for each UE in the UE set corresponding to each neighboring cell, the UE identity of the UE may also be recorded.

S402a: Determine the common coverage of the target cell by at least two neighboring cells according to the number of UEs included in the UE set corresponding to each neighboring cell.

In a specific implementation process, the ratio of the sum of the number of UEs contained in the UE set corresponding to each neighboring cell to the total number of multiple UEs may be determined as the common coverage of the target cell by the at least two neighboring cells.

For example, the target cell has two neighboring cells, and a total of 30 measurement reports reported by UEs are collected within the coverage area of the target cell. Among them, the number of UEs contained in the UE set corresponding to neighboring cell 1 is 10, and the number of UEs included in the UE set corresponding to neighboring cell 2 is The number of UEs included in the UE set is 12, then the sum of the number of UEs included in the UE sets corresponding to each neighboring cell is 22, and the common coverage of the neighbor cell 1 and the neighbor cell 2 on the target cell is

Optionally, considering that there may be duplicate UEs in the UE set corresponding to each neighboring cell, when determining the sum of the number of UEs contained in the UE set corresponding to each neighboring cell, the UE identity of each UE may also be used for The UE sets corresponding to each neighboring cell are combined, and then the number of UEs included in the union is determined as the sum of the numbers of UEs included in the UE sets corresponding to each neighboring cell.

Following the above example, assuming that there is one UE with the same UE identity in the UE set corresponding to neighboring cell 1 and the UE set corresponding to neighboring cell 2, then at this time, the sum of the number of UEs contained in the UE sets corresponding to each neighboring cell is 21. The common coverage of adjacent cell 1 and adjacent cell 2 to the target cell is

S403a: Judging whether the common coverage of the target cell by at least two neighboring cells is not lower than the first preset threshold, if yes, proceed to S404a; otherwise, proceed to S405a.

Wherein, the value range of the first preset threshold may be 60% to 80%, which may be selected according to actual requirements in practical applications.

S404a: Determine that at least two neighboring cells jointly cover the target cell.

S405a: Determine that at least two neighboring cells do not jointly cover the target cell.

In addition, before performing the above step S402a, the overlapping coverage of each neighboring cell to the target cell may also be determined.

Specifically, for each neighboring cell, the ratio of the number of UEs contained in the UE set to the total number of multiple UEs is determined as the overlapping coverage of the neighboring cell to the target cell, and when determining the overlapping coverage of each neighboring cell to the target cell After the coverage is greater than the second set threshold corresponding to the adjacent cell, then determine the common coverage of at least two adjacent cells to the target cell, wherein the second set threshold can be 15%, and each adjacent cell corresponds to The second set thresholds can be the same or different.

In the specific implementation process, if it is determined that at least two neighboring cells jointly cover the target cell, the traffic volume of the target cell can also be monitored, and after it is determined that the traffic volume of the target cell is lower than the third set threshold, the target cell is determined to be an energy-saving cell, Further, an instruction for instructing the target cell to enter the sleep state is sent to the target cell. In this way, when the traffic volume is relatively low, closing some energy-saving cells properly can better save the network resources of the entire base station.

In the embodiment of the present application, the MRs reported by multiple UEs within the coverage of the target cell are obtained, and then the MRs reported by each UE are analyzed to obtain the signal strengths of at least two neighboring cells of the target cell, and then based on the obtained MRs of each neighboring cell Signal strength, determining whether the at least two adjacent cells jointly cover the target cell. In this way, when the covered cell cannot be identified according to the geographic location of the base station in the scenario of one more complement, the signal strength of at least two neighboring cells can be obtained based on the MR reported by the UE within the coverage of the target cell, and then the signal strength of each neighboring cell can be obtained based on the The signal strength determines whether the at least two adjacent cells jointly cover the target cell. For example, when the coverage of each adjacent cell to the target cell is relatively high, or the common coverage of all adjacent cells to the target cell is relatively high, the adjacent cell can be considered The common coverage target cell, this method of determining the common coverage cell based on the measurement report, has better feasibility and practicability.

Embodiment two

As shown in FIG. 5 , it is a schematic diagram of a multi-complement scenario. In the figure, there are three cells A, B, and C. Among them, cell C is the target cell, and cells A and B are neighbors of cell C. As shown in Figure 6, the flow chart of the method for determining whether adjacent cells A and B overlap and cover cell C provided by the embodiment of the present application includes the following steps:

S601: Collect MRs reported by multiple UEs within the coverage of cell C.

Assuming that there are K UEs within the coverage of cell C, and each UE is a sampling point, K MRs can be collected.

S602: Analyze the MR reported by each UE separately to obtain the signal strengths of neighboring cells A and B.

S603: For each neighboring cell in neighboring cells A and B, based on the obtained signal strength of the neighboring cell, determine a UE set composed of UEs that are higher than the signal strength threshold corresponding to the neighboring cell, and count the UE set in the UE set The number of UEs included.

Suppose, among the K sampling points, the set of sampling points M={k ₁ ,k ₂ ,k ₃ ,...,k _M } that satisfy the signal strength threshold corresponding to neighboring cell A, and the sampling points that satisfy the signal strength threshold corresponding to neighboring cell B Set N={k ₁ , k ₃ , k ₄ ,...,k _N }, then the number of UEs included in the set M is Length(M), and the number of UEs included in the set N is Length(N).

In addition, for each UE contained in the sets M and N, the UE identity of the UE may also be recorded.

S604: According to the number of UEs contained in the UE set corresponding to the neighboring cells A and B, determine the common coverage of the neighboring cells A and B to the cell C.

In the specific implementation process, the common coverage of the neighboring cells A and B to the cell C can be determined according to the following two methods.

Method 1: The ratio of the sum of the number of UEs contained in sets M and N to the total number of collected UEs is determined as the common coverage of neighboring cells A and B to cell C. The common coverage of C is (Length(M)+Length(N))/K.

Method 2: Considering that there may be duplicate UEs in the sets M and N, the sets M and N can be combined according to the UE identity of each UE in M and N, and then the common coverage can be determined. The common coverage of cell C by areas A and B is Length(MUN)/K.

S605: Determine whether the common coverage of the cell C by the neighboring cells A and B is not lower than the first preset threshold Th1, if yes, go to S606; otherwise, go to S607.

Wherein, the first preset threshold Th1 may be 70%.

S606: Determine that neighboring cells A and B jointly cover cell C.

S607: Determine that the neighboring cells A and B do not jointly cover the cell C.

In addition, before performing the above step S604, for each of the neighboring cells A and B, the overlapping coverage of the neighboring cell to the cell C may also be calculated.

Specifically, the overlapping coverage degree of the neighboring cell A to the cell C is Length(M)/K, and the overlapping coverage degree of the neighboring cell B to the cell C is Length(N)/K. When the overlapping coverage of neighboring cells A and B on cell C satisfies Length(M)/K>Th2, and Length(N)/K>Th2, step S604 is performed again, wherein Th2 may be 15%.

Further, after it is determined that the neighboring cells A and B cover the cell C, the traffic volume of the cell C can be monitored, and after it is determined that the traffic volume of the cell C is lower than the third set threshold, a message indicating the cell C can be sent to the cell C. Instructions to enter the sleep state.

Based on the same inventive concept, the embodiment of the present application also provides a device for determining an overlapping coverage cell corresponding to the method for determining an overlapping coverage cell, because the principle of the device to solve the problem is similar to the method for determining an overlapping coverage cell in the embodiment of the present application , so the implementation of the device can refer to the implementation of the method, and the repetition will not be repeated.

As shown in FIG. 7, a structure diagram of a device 70 for determining overlapping coverage cells provided by the embodiment of the present application includes:

An acquisition module 701, configured to acquire measurement reports MR reported by multiple user terminals UE within the coverage of the target cell;

An analysis module 702, configured to separately analyze the MR reported by each UE to obtain the signal strengths of at least two neighboring cells of the target cell;

A common coverage judging module 703, configured to determine whether the at least two neighboring cells jointly cover the target cell based on the obtained signal strength of each neighboring cell of the target cell.

Optionally, the common coverage judging module 703 specifically includes:

a UE set determining unit, configured to, for each of the at least two neighboring cells, determine a signal strength threshold higher than the corresponding signal strength of the neighboring cell based on the signal strength of the neighboring cell measured by the plurality of UEs A UE set composed of UEs;

A statistical unit, configured to count the number of UEs included in the UE set;

A common coverage calculation unit, configured to determine the common coverage of the at least two neighboring cells for the target cell according to the number of UEs included in the UE set corresponding to each neighboring cell;

A common coverage judging unit, configured to determine that the at least two neighboring cells jointly cover the target cell if the common coverage is not lower than a first preset threshold.

Optionally, the common coverage calculation unit is specifically configured to:

Determining the ratio of the sum of the number of UEs included in the UE set corresponding to each neighboring cell to the total number of the plurality of UEs is the common coverage of the target cell by the at least two neighboring cells.

Optionally, the device further includes: a recording module;

The recording module is configured to, when the UE set determining unit determines, for each of the at least two neighboring cells, a UE set composed of UEs higher than the signal strength threshold corresponding to the neighboring cell, to record UE identity of each UE contained in the UE set;

The common coverage calculation unit is specifically configured to: determine the union set of UE sets corresponding to each neighboring cell according to the UE identity; determine that the number of UEs included in the union set is included in the UE set corresponding to each neighboring cell The sum of the number of UEs.

Optionally, the device further includes: a neighboring cell coverage judging module 704;

The neighboring cell coverage judging module 704 is configured to determine, in the common coverage calculation unit, the common coverage of the target cell by the at least two neighboring cells according to the number of UEs included in the UE set corresponding to each neighboring cell. Before the coverage, for each neighboring cell, determine the ratio of the number of UEs contained in the UE set to the total number of the multiple UEs as the overlapping coverage of the neighboring cell to the target cell; and determine each neighboring cell The overlapping coverage of the target cell is greater than the second set threshold corresponding to the neighboring cell.

Optionally, the device: a sending module 705;

The sending module 705 is configured to monitor the traffic volume of the target cell if it is determined that the at least two neighboring cells jointly cover the target cell; after determining that the traffic volume of the target cell is lower than a third set threshold , sending an instruction for instructing the target cell to enter the dormant state to the target cell.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow diagram procedure or procedures and/or block diagram procedures or blocks.

While preferred embodiments of the present application have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, the appended claims are intended to be construed to cover the preferred embodiment and all changes and modifications which fall within the scope of the application.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims (12)

1. A method for determining overlapping coverage cells, characterized in that the method comprises: Acquiring measurement reports MR reported by multiple user terminals UE within the coverage of the target cell; Respectively analyzing the MR reported by each UE to obtain the signal strength of at least two neighboring cells of the target cell; Based on the obtained signal strength of each neighboring cell of the target cell, determine whether the at least two neighboring cells jointly cover the target cell. 2. The method according to claim 1, wherein, based on the obtained signal strength of each neighboring cell of the target cell, determining whether the at least two neighboring cells jointly cover the target cell, specifically comprises : For each of the at least two neighboring cells, based on the signal strengths of the neighboring cells measured by the plurality of UEs, determine a UE set composed of UEs that are higher than the signal strength threshold corresponding to the neighboring cell; Counting the number of UEs included in the UE set; determining the common coverage of the target cell by the at least two neighboring cells according to the number of UEs included in the UE set corresponding to each neighboring cell; If the common coverage is not lower than the first preset threshold, determine that the at least two neighboring cells jointly cover the target cell. 3. The method according to claim 2, wherein, according to the number of UEs contained in the UE set corresponding to each neighboring cell, determining the common coverage of the at least two neighboring cells to the target cell, specifically comprising : Determining the ratio of the sum of the number of UEs included in the UE set corresponding to each neighboring cell to the total number of the plurality of UEs is the common coverage of the target cell by the at least two neighboring cells. 4. The method according to claim 3, wherein, for each neighboring cell in the at least two neighboring cells, when determining the UE set composed of UEs higher than the signal strength threshold corresponding to the neighboring cell, Also includes: Recording the UE identity of each UE included in the set of UEs; and Determine the sum of the number of UEs contained in the UE set corresponding to each neighboring cell, specifically including: According to the UE identity, determine the union of UE sets corresponding to each neighboring cell; The number of UEs included in the union set is determined to be the sum of the numbers of UEs included in the UE sets corresponding to the neighboring cells. 5. The method according to claim 2, wherein, before determining the common coverage of the target cell by the at least two neighboring cells according to the number of UEs contained in the UE set corresponding to each neighboring cell, further include: For each neighboring cell, determining that the ratio of the number of UEs included in the UE set to the total number of the plurality of UEs is the overlapping coverage of the neighboring cell to the target cell; and It is determined that the overlapping coverage of each neighboring cell to the target cell is greater than a second set threshold corresponding to the neighboring cell. 6. The method according to any one of claims 1-5, wherein if it is determined that the at least two neighboring cells jointly cover the target cell, the method further comprises: monitoring the traffic of the target cell; After it is determined that the traffic volume of the target cell is lower than the third set threshold, an instruction for instructing the target cell to enter a dormant state is sent to the target cell. 7. A device for determining overlapping coverage cells, characterized in that the device comprises: An acquisition module, configured to acquire measurement reports MR reported by multiple user terminals UE within the coverage of the target cell; An analysis module, configured to separately analyze the MR reported by each UE, and obtain the signal strengths of at least two neighboring cells of the target cell; A common coverage judging module, configured to determine whether the at least two neighboring cells jointly cover the target cell based on the obtained signal strength of each neighboring cell of the target cell. 8. The device according to claim 7, wherein the common coverage judging module specifically comprises: a UE set determining unit, configured to, for each of the at least two neighboring cells, determine a signal strength threshold higher than the corresponding signal strength of the neighboring cell based on the signal strength of the neighboring cell measured by the plurality of UEs A UE set composed of UEs; A statistical unit, configured to count the number of UEs included in the UE set; A common coverage calculation unit, configured to determine the common coverage of the at least two neighboring cells for the target cell according to the number of UEs included in the UE set corresponding to each neighboring cell; A common coverage judging unit, configured to determine that the at least two neighboring cells jointly cover the target cell if the common coverage is not lower than a first preset threshold. 9. The device according to claim 8, wherein the common coverage calculation unit is specifically configured to determine the sum of the number of UEs contained in the UE set corresponding to each neighboring cell and the total number of the plurality of UEs The ratio of is the common coverage of the target cell by the at least two neighboring cells. 10. The device according to claim 9, further comprising: a recording module; The recording module is configured to, for each of the at least two neighboring cells, when determining a UE set composed of UEs higher than the signal strength threshold corresponding to the neighboring cell, record the UE set contained in the UE set UE identity of each UE; The common coverage calculation unit is specifically configured to determine a union of UE sets corresponding to each neighboring cell according to the UE identifier; determine that the number of UEs contained in the union is included in the UE set corresponding to each neighboring cell The sum of the number of UEs. 11. The device according to claim 8, further comprising: a neighboring cell coverage judgment module; The neighboring cell coverage judging module is used to determine the common coverage of the target cell by the at least two neighboring cells according to the number of UEs included in the UE set corresponding to each neighboring cell in the common coverage calculation unit Before the degree, for each neighboring cell, it is determined that the ratio of the number of UEs contained in the UE set to the total number of the plurality of UEs is the overlapping coverage of the neighboring cell to the target cell; The overlapping coverage of the target cell is greater than the second set threshold corresponding to the neighboring cell. 12. The device according to any one of claims 7-11, further comprising: a sending module; The sending module is configured to monitor the traffic volume of the target cell if it is determined that the at least two neighboring cells jointly cover the target cell; after determining that the traffic volume of the target cell is lower than a third set threshold, Sending an instruction for instructing the target cell to enter a sleep state to the target cell.