WO2011147282A1

WO2011147282A1 - Method and apparatus for multi-base station implementing covering optimization jointly

Info

Publication number: WO2011147282A1
Application number: PCT/CN2011/074448
Authority: WO
Inventors: 费腾; 高音
Original assignee: 刘建
Priority date: 2010-05-26
Filing date: 2011-05-20
Publication date: 2011-12-01
Also published as: CN102264084A; CN102264084B

Abstract

A method and apparatus for multi-base station implementing covering optimization jointly are provided, which are used to solve the problems of multi-base station incoordination, optimization inefficiency in the existing covering optimization solution. The present invention triggers an adjacent base station to implement covering adjustment operation of an adjacent cell with a covering adjustment notification, a covering adjustment request and other messages, and thereby several base stations can implement covering optimization jointly, so that self-organization and self-optimization of the cell covering are realized, and optimization efficiency is improved.

Description

Method and device for jointly performing coverage optimization by multiple base stations

The present invention relates to the field of mobile communications, and in particular, to a self-organizing, self-optimizing scheme of a mobile communication network, and a method and apparatus for jointly performing coverage optimization by multiple base stations. Background technique

In a cellular mobile communication network, from the perspective of a wireless signal, the entire network is composed of a large number of cells; from the perspective of the network element device, it is composed of a plurality of base stations, each of which is used to implement a wireless network. One or several cells in the middle. Generally, an area in which a cell signal can be effectively used to implement a communication service is defined as a coverage of the cell, which is referred to as cell coverage.

Because of the impact of changes in the wireless environment, the impact of network planning changes, and the impact of network equipment status, during the actual operation of the network, cell coverage will occur, coverage holes, uplink and downlink coverage will not match, and coverage area services will be unbalanced.

Previous coverage problems of this type were manually solved by network optimizers. With the development of mobile communication networks, network operators have been required to solve these problems more quickly and more efficiently by mobile communication networks through self-organizing, self-optimizing mechanisms. Taking the LTE system as an example, there is a method for reporting the coverage problem by using the UE to implement the radio link failure (RLF) information reporting. The UE may report some information when the RLF occurred before the RRC is reestablished or established. The base station, for example, the signal quality of the serving cell and the neighboring cell when the RLF occurs. The base station can use the information reported by the UE to detect the coverage problem. For example, the simplest decision is based on the fact that if the UE has poor signal in the serving cell and the surrounding neighboring area when the RLF occurs, it can be considered that there is a coverage problem in the area. At the same time, the RLF reporting information of the UE can also be transmitted to other base stations through the interface, and the other base stations perform the decision.

The existing shortcomings of the optimized method for cell coverage are: due to cell coverage capability and service Capacity limitation. When the coverage problem occurs in the network, only adjusting the coverage of one cell cannot achieve the expected effect. When adjusting the coverage of a cell, the surrounding cells must also adjust the coverage. Otherwise, new coverage problems may occur. Therefore, the optimized workload is large and inefficient. Summary of the invention

In view of this, the main object of the present invention is to provide a method and a device for jointly performing coverage optimization by using multiple base stations, which are used to solve the problem that the multiple base stations are uncoordinated and the optimization efficiency is low in the existing coverage optimization solution.

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

A method for jointly performing coverage optimization by multiple base stations, the method comprising:

After the source cell completes its own coverage adjustment, the base station where the source cell is located sends a cell coverage adjustment notification message to the neighboring base station, to trigger the neighboring base station to determine whether the neighboring cell of the source cell needs to be correspondingly And the coverage adjustment action; the cell in the cell coverage adjustment notification message includes: the source cell identifier, the coverage adjustment action performed by the source cell, and the reason for performing the coverage adjustment by the source cell; It may be the adjustment of the uplink/downlink coverage size or the adjustment of the coverage location. The coverage adjustment may be due to the coverage gap or the load balancing, or the uplink and downlink coverage may not match. The coverage adjustment may further include: the quality of the uplink and downlink channels. , up and down load information, etc.

Or, when the source cell meets the preset triggering condition, the base station where the source cell is located sends a cell coverage adjustment request to the neighboring base station, where the cell coverage adjustment request is used to request the neighboring base station to the neighboring cell of the source cell. Performing coverage adjustment; the cell in the cell coverage adjustment request message includes at least: a source cell identifier, an identifier of a neighboring cell that needs to perform coverage adjustment, a coverage adjustment action that needs to be performed by a neighboring cell, and a neighbor cell execution required The reason for the coverage adjustment; the action of the coverage adjustment may be the adjustment of the uplink/downlink coverage size or the adjustment of the coverage location; the reason for the coverage adjustment may be to compensate for the coverage hole, or the load balance, or the uplink and downlink coverage does not match. The specific information in the coverage adjustment reason may include the quality of the uplink and downlink channels and the uplink and downlink load. Information, hardware load information, etc.

The preset triggering condition refers to a condition that the source cell needs to adjust the coverage of the neighboring cell, for example, the source cell is lightly loaded, can expand the coverage, and absorb more services, and the neighboring cell can narrow the coverage and absorb more. For example, the source cell is heavily loaded, and the coverage needs to be narrowed to absorb less traffic. The neighboring cell needs to increase the coverage and absorb more services. For example, if the source cell device fails, the uplink and downlink coverage does not match. The source cell is forced to narrow the coverage before/after, and the neighboring cell needs to expand the coverage.

Further, after receiving the cell coverage adjustment request, the neighboring base station of the base station where the source cell is located performs a corresponding coverage adjustment action according to its own situation, and sends a cell coverage adjustment response to the source cell, where the response message is sent. The cell includes at least: a source cell identifier, a cell identifier for coverage adjustment, and a result of the coverage adjustment.

Further, the method further includes: when detecting that the user equipment handover fails, the source base station sends a handover report (HANDOVER REPORT) to the neighboring base station, where the handover report is used to notify the neighboring cell of the reason for the handover failure, if the transmission is Before the handover report, the source base station has performed the coverage adjustment operation according to the reason of the handover failure, and may carry the cell identifier of the coverage adjustment that has been completed in the neighboring cell in the handover report message, and cover the adjustment action and the coverage adjustment reason. The action of the coverage adjustment may be the adjustment of the uplink/downlink coverage size or the adjustment of the coverage location; the reason for the coverage adjustment may be to compensate for the coverage hole, or the load balance, or the uplink and downlink coverage does not match. The specific information in the coverage adjustment reason may include the quality of the uplink and downlink channels, uplink and downlink load information, and the like.

Based on the foregoing method, the present invention further provides a device for performing coverage optimization in a multi-base station, where the device is located in a base station, and an implementation manner of the device includes:

And a notification notification module, configured to send a cell coverage adjustment notification message to the neighboring base station, to trigger the neighboring base station to determine whether a corresponding coverage adjustment action needs to be performed on the neighboring cell of the source cell; The cell includes at least: the source cell identifier, The coverage adjustment operation performed by the source cell and the reason for the coverage adjustment performed by the source cell; the notification processing module, configured to perform a corresponding overlay adjustment action after receiving the cell coverage adjustment notification message;

Another implementation of the device includes:

The adjustment requesting module is configured to send a cell coverage adjustment request to the neighboring base station, where the cell coverage adjustment request is used to request the neighboring base station to perform coverage adjustment on the neighboring cell of the source cell, where the cell coverage adjustment request message is The cell at least includes: a source cell identifier, an identifier of a neighboring cell that needs to perform coverage adjustment, a coverage adjustment action that needs to be performed by the neighboring cell, and a reason that the neighboring cell needs to perform coverage adjustment;

The adjusting response module is configured to: after receiving the cell coverage adjustment request, perform a corresponding coverage adjustment action according to the situation, and send a cell coverage adjustment response to the source cell, where the cell in the response message at least includes: Cell identifier, cell identifier for coverage adjustment, and coverage adjustment result.

Further, the device further includes:

a report sending module, configured to: when the source base station detects that the user equipment handover fails, send a handover report to the neighboring base station, if the source cell has performed the cover adjustment operation according to the reason of the handover failure before sending the handover report, Transmitting the cell identifier, the coverage adjustment action, and the coverage adjustment reason in the neighboring cell that have completed the coverage adjustment in the handover report;

a report processing module, configured to determine, according to the cell identifier, the coverage adjustment action, and the coverage adjustment reason, that the coverage adjustment has been completed in the neighboring cell carried in the handover report, whether the neighboring cell of the source cell needs to be made The corresponding overlay adjustment action.

In the device, the action of the coverage adjustment includes: adjustment of an uplink/downlink coverage size and adjustment of a coverage location; the reason for the coverage adjustment includes: making up coverage holes, load balancing, or uplink/downlink coverage mismatch. The coverage adjustment reason also includes the quality of the uplink and downlink channels and/or the uplink and downlink load information. The invention triggers the neighboring base station to perform the coverage adjustment operation of the neighboring cell by using the coverage adjustment notification, the coverage adjustment request, and the like, so that multiple base stations can jointly perform coverage optimization, realizing self-organization and self-optimization for the cell coverage, and improving Optimize efficiency. DRAWINGS

1A, FIG. 1B, FIG. 1C and FIG. 1D are flowcharts of processing according to Embodiment 1 of the present invention; FIG. 2A, FIG. 2B, FIG. 2C and FIG. 2D are flowcharts of processing according to Embodiment 2 of the present invention; FIG. 3A, FIG. 3C, FIG. 3D and FIG. 3E are flowcharts of processing according to Embodiment 3 of the present invention; FIG. 4 is a structural diagram of a device for performing coverage optimization by a first multi-base station according to the present invention; Cover the optimized device structure diagram. detailed description

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

The following takes the LTE system as an example. When the related coverage adjustment notification is transmitted through the X2 interface (the interface between the base station and the base station), or the adjustment request is overwritten, the process may be completed through a separate process or in the message of other processes. The cell is added to complete, and the specific steps are as described in the following embodiments.

Embodiment 1

In the LTE system, the coverage adjustment indication message is transmitted on the X2 interface, so that multiple base stations can jointly perform coverage adjustment to solve the problem of coverage holes. 1A, FIG. 1B, FIG. 1C is a schematic diagram of performing multi-base station joint coverage adjustment according to an embodiment of the present invention, and FIG. 1D is a flowchart of a method according to the embodiment. The method is specifically:

Step S101: The evolved base station eNB1 receives the radio link reported by the UE, and finds a coverage hole, as shown in FIG. 1A.

Step S102: The eNB1 triggers an operation of increasing the coverage range, and the coverage area is increased as shown in FIG. 1B. Show

Step S103: The eNB1 sends a cell coverage adjustment notification to the evolved base station eNB2 through the X2 interface, where the cell coverage adjustment notification includes a cell identifier, a coverage adjustment action, and a coverage adjustment cause, where the cell identifier is a cell identifier that has successfully adjusted coverage. The identifier of the cell under the jurisdiction of the eNB1 in this embodiment, the coverage adjustment action is to increase the uplink and downlink coverage, and the coverage adjustment reason is to compensate for the coverage hole, and the relevant uplink and downlink wireless signal quality is added;

Step S104: After receiving the cell coverage adjustment notification sent by the eNB1, the eNB2 determines whether the eNB2 is adjacent to the eNB1 according to the cell identifier, the coverage adjustment reason, and the related uplink and downlink radio signal quality of the completed coverage adjustment carried in the message. There is still a coverage hole, if yes, step S105 is performed; otherwise, no processing is performed;

Step S105: The eNB2 triggers the operation of increasing the coverage, and finally the coverage hole disappears, as shown in the figure.

1C. Embodiment 2

In the LTE system, the cell coverage adjustment request message is transmitted on the X2 interface, so that multiple base stations can jointly perform coverage adjustment to solve the problem of load balancing. FIG. 2A, FIG. 2B, FIG. 2C are schematic diagrams of performing multi-base station joint coverage adjustment according to Embodiment 2 of the present invention, and FIG. 2D is a flowchart of the method according to the embodiment, where the method is specifically:

Step S201: Adding a traffic volume on the eNB1 to increase the load balancing start threshold. When the traffic volume on the eNB1 exceeds the load balancing start threshold, the eNB1 triggers the operation of narrowing the coverage. Before the coverage is reduced, as shown in FIG. 2A, the coverage is After zooming out, as shown in Figure 2B,

Step S202: After completing the coverage reduction operation, the eNB1 sends a cell coverage adjustment request to the eNB2 and the eNB3 through the X2 interface, where the cell identifier needs to be adjusted, and the required coverage adjustment action is to increase the uplink and downlink coverage, and the coverage adjustment. The reason is load balancing, and the uplink and downlink load of eNB1 is added. It is hoped that after receiving the message, eNB2 and eNB3 can increase the coverage to absorb the traffic distributed on the boundary and make up for possible coverage holes. Step 203: After receiving the cell coverage adjustment request sent by the eNB1, the eNB2 determines, according to the load information of the eNB1 carried in the message, that the eNB2 itself has more traffic, and the load of the eNB1 is equivalent, so the coverage adjustment is not triggered. Then, the eNB1 returns a cell coverage adjustment response message, which includes information that the eNB2 does not perform coverage adjustment.

In step S204, after receiving the cell coverage adjustment request sent by the eNB1, the eNB3 determines, according to the load information of the eNB1 carried in the message, that the eNB3 carries less traffic, and can share the traffic on the part of the boundary for the eNB1, thus triggering The uplink and downlink coverage is increased. As shown in FIG. 2C, after the eNB3 adjusts the coverage, the coverage hole caused by the eNB1 narrowing the coverage is eliminated. Finally, the eNB1 returns a cell coverage adjustment response message, which includes the result that the eNB3 has increased the uplink and downlink coverage according to the requirement of the eBN1. Embodiment 3

In the LTE system, by transmitting a handover report message on the X2 interface, multiple base stations can jointly perform coverage adjustment to solve the problem of uplink and downlink coverage mismatch. 3A, FIG. 3B, FIG. 3C, and FIG. 3D are schematic diagrams of performing multi-base station joint coverage adjustment according to Embodiment 3 of the present invention, and FIG. 3E is a flowchart of the method in this embodiment, where the method is specifically:

Step S301: The eNB1 detects the process of the UE handover failure, and the performance is that the handover is too early, and the uplink signal quality is not good enough. Actually, the uplink and downlink coverages are not matched, and the uplink coverage is worse than the downlink coverage. As shown in FIG. 3A, the dotted line indicates the uplink coverage. Area, so eNB1 triggers the process of reducing the downlink coverage, as shown in Figure 3B;

Step S302: After completing the process of reducing the downlink coverage, the eNB1 sends a handover report message to the eNB2 and the eNB3 through the X2 interface, adds a cell in the handover report message, or uses a special value of the existing cell to carry the coverage adjustment performed by the eNB1. The cell identifier of the neighboring cell, the action of the coverage adjustment, and the reason for the coverage adjustment; wherein, in this embodiment, the action of the coverage adjustment is to reduce the downlink coverage, and the reason for the coverage adjustment is that the uplink and downlink coverage does not match, and the related Up and down wireless signal quality. Step 303: After receiving the handover report sent by the eNB1, the eNB2 determines, according to the relevant uplink and downlink wireless signal quality information carried in the message, that there is a situation that the uplink and downlink coverage does not match, and because the eNB1 has reduced the downlink coverage, the eNB2 Triggering the coverage adjustment, increasing the uplink and downlink coverage of the neighboring cell with the eNB1, as shown in FIG. 3C, to ensure that there is no hole in the coverage between the eNB1 and the eNB2;

Step S304, after receiving the handover report sent by the eNB1, the eNB3 determines, according to the relevant uplink and downlink radio signal quality information carried in the message, that there is a situation that the uplink and downlink coverage does not match, and because the eNB1 has narrowed the downlink coverage, The eNB3 triggers the coverage adjustment to increase the uplink and downlink coverage of the neighboring cell with the eNB1, as shown in FIG. 3D, to ensure that there is no hole in the coverage between the eNB1 and the eNB3.

In order to implement the method of the present invention, the present invention provides a device for jointly performing coverage optimization by multiple base stations, the device having two possible implementations;

In the first implementation structure, the adjustment notification module and the notification processing module are included in the base station, as shown in FIG. 4;

The adjustment notification module is configured to send a cell coverage adjustment notification message to the neighboring base station, to trigger the neighboring base station to determine whether a corresponding coverage adjustment action needs to be performed on the neighboring cell of the source cell, where the cell coverage adjustment notification message is The cell includes: the source cell identifier, an coverage adjustment action performed by the source cell, and a reason for the source cell performing coverage adjustment;

The notification processing module is configured to perform a corresponding overlay adjustment action after receiving the cell coverage adjustment notification message;

In the second implementation structure, the adjustment request module and the adjustment response module are included in the base station, as shown in FIG. 5;

The adjustment requesting module is configured to send a cell coverage adjustment request to the neighboring base station, where the cell coverage adjustment request is used to request the neighboring base station to perform coverage adjustment on the neighboring cell of the source cell; the cell in the cell coverage adjustment request message The element contains at least: source cell identifier, need to be covered The identifier of the adjusted neighboring cell, the coverage adjustment action required by the neighboring cell, and the reason why the neighboring cell needs to perform the coverage adjustment;

The adjusting response module is configured to: after receiving the cell coverage adjustment request, perform a corresponding coverage adjustment action according to the situation, and send a cell coverage adjustment response to the source cell, where the cell in the response message includes at least: a source cell The identifier, the cell identifier for coverage adjustment, and the result of the overlay adjustment.

Based on the foregoing two implementation structures, the apparatus may further include: a report sending module and a report processing module;

The report sending module is configured to: when the source base station detects that the user equipment handover fails, send a handover report to the neighboring base station, if the source cell has performed the overlay adjustment operation according to the reason of the handover failure before sending the handover report, Carrying, in the handover report, a cell identifier, a coverage adjustment action, and a coverage adjustment reason that have completed coverage adjustment in the neighboring cell;

The report processing module is configured to determine, according to the cell identifier, the coverage adjustment action, and the coverage adjustment reason, that the coverage adjustment has been completed in the neighboring cell that is carried in the handover report, whether the neighboring cell of the source cell needs to be corresponding Cover adjustment action.

The action of the coverage adjustment includes: adjustment of an uplink and downlink coverage size, and adjustment of a coverage location; the reasons for the coverage adjustment include: making up coverage holes, load balancing, or uplink/downlink coverage mismatch. The coverage adjustment cause may further include quality of uplink and downlink channels and/or uplink and downlink load information.

In summary, the foregoing embodiments of the present invention provide a goal of implementing network coverage optimization by transmitting an overlay adjustment indication between base stations to implement joint coverage adjustment of multiple base stations.

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 Executing, or making them separately into individual integrated circuit modules, or making multiple of these modules or steps into 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. within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Claim

A method for jointly performing coverage optimization by using multiple base stations, wherein the method includes: sending, by a base station, a cell coverage adjustment notification message to a neighboring base station, to trigger a neighboring base station to determine whether the source cell needs to be The neighboring cell performs a corresponding coverage adjustment action; the cell in the cell coverage adjustment notification message includes at least: a source cell identifier, a coverage adjustment action performed by the source cell, and a source cell performing coverage adjustment; or

The base station where the source cell is located sends a cell coverage adjustment request to the neighboring base station, where the cell coverage adjustment request is used to request the neighboring base station to perform coverage adjustment on the neighboring cell of the source cell; the cell in the cell coverage adjustment request message The method includes at least: a source cell identifier, an identifier of a neighboring cell that needs to perform coverage adjustment, a coverage adjustment action that needs to be performed by the neighboring cell, and a reason why the neighboring cell needs to perform coverage adjustment.

The method according to claim 1, wherein the method further comprises: when detecting that the user equipment handover fails, the source base station sends a handover report to the neighboring base station, if the source is sent before the handover report If the cell has performed the coverage adjustment operation according to the reason of the handover failure, the handover report carries the cell identifier, the coverage adjustment action, and the coverage adjustment reason in the neighboring cell that have completed the coverage adjustment.

The method according to claim 1 or 2, wherein after the neighboring base station of the base station where the source cell is located receives the cell coverage adjustment request, performing a corresponding coverage adjustment action according to its own situation, and The source cell sends a cell coverage adjustment response, where the cell in the response message includes at least: a source cell identifier, a cell identifier for performing coverage adjustment, and a result of coverage adjustment.

The method according to claim 1 or 2, wherein the action of the overlay adjustment comprises: adjusting an uplink and downlink coverage size and adjusting an overlay location; and the reason for the overlay adjustment comprises: compensating for coverage holes and loads Balanced, or the uplink and downlink coverage does not match.

The method according to claim 4, wherein the coverage adjustment cause further includes quality of uplink and downlink channels and/or uplink and downlink load information.

A device for performing coverage optimization in a multi-base station, wherein the device includes: an adjustment notification module, configured to send a cell coverage adjustment notification message to a neighboring base station, to trigger a neighboring base station to determine whether the The neighboring cell of the source cell performs a corresponding coverage adjustment action; the cell in the cell coverage adjustment notification message includes at least: a source cell identifier, a coverage adjustment action performed by the source cell, and a cause of performing coverage adjustment by the source cell;

a notification processing module, configured to perform a corresponding overlay adjustment action after receiving the cell coverage adjustment notification message;

Or, the device includes:

The device according to claim 6, wherein the device further comprises: a report sending module, configured to: when the source base station detects that the user equipment handover fails, send a handover report to the neighboring base station, if the sending Before the handover report, the source cell has performed the operation of the coverage adjustment according to the reason of the handover failure, and the handover report carries the cell identifier, the coverage adjustment action, and the coverage adjustment reason that have completed the coverage adjustment in the neighboring cell;

a report processing module, configured to: according to the neighboring cell carried in the handover report The cell identifier, the coverage adjustment action, and the coverage adjustment cause decision that complete the coverage adjustment determine whether a corresponding coverage adjustment action needs to be performed on the neighboring cell of the source cell.

The device according to claim 6 or 7, wherein the action of the overlay adjustment comprises: adjusting an uplink and downlink coverage size and adjusting an overlay location; and the reason for the overlay adjustment comprises: making up coverage holes and loads Balanced, or the uplink and downlink coverage does not match.

The device according to claim 8, wherein the coverage adjustment cause further includes quality of uplink and downlink channels and/or uplink and downlink load information.