KR101503747B1 - System And Method Neighbor Cell Management - Google Patents

Abstract

In the present invention, the validity of neighboring cells is verified by using the handoff statistics and the cell-to-cell distances, and recommendation of invalid neighboring cells as candidates for deletion makes it possible to present a standard for cell management and to systemize the cell, To a system and method for neighbor cell management.
According to another aspect of the present invention, there is provided a method for managing neighboring cells, the method comprising: collecting neighbor relationship information for one or more cells from a base station or an MS managing the base station; ; Or handoff statistics including a handoff attempt number or a handoff success rate between the serving cell and the target cell.

Description

{System And Method Neighbor Cell Management}

The present invention relates to a system and method for neighboring cell management, and more particularly, to a system and method for neighboring cell management, in which validity of a neighboring cell is verified by using handoff statistics and cell- The present invention relates to a system and method for managing a neighboring cell.

In a mobile communication system, a cell is a basic unit for providing a service to a user equipment (UE), and a plurality of cells are constituted to provide a service. In a cell composed of a plurality of cells, one or more adjacent cells are present, and the user can receive a continuous service while moving the cell.

In order to link the continuous service and the system, each cell registers and manages a neighboring cell or a cell located in a coverage area as a neighboring cell. To this end, an auto neighbor relationship (ANR) function is provided so that the mobile communication system, especially LTE (Long Term Evolution) neighbor registration management can be automatically performed. This function is a function for automatically collecting and registering neighboring cell information for a cell configured in the base station in each base station. The ANR function of the LTE system enables to allocate and set various parameters including the cell ID, and to provide services such as handoff more reliably than conventional mobile communication.

However, even though the same function as ANR is used, neighboring cell management in a mobile communication system still needs selection and adjustment by the user. However, there is a problem in that a method for efficiently performing the management of the user is not provided even though the management of the user is required.

Specifically, the cell should have an appropriate coverage radius for each region such as a metropolis, a small city, a mountain, and a subscriber, and overshooting that exceeds the coverage may cause degradation of the network quality. When an overshooting occurs, a cell exceeding the coverage is not registered in the neighboring cell. Therefore, the required cell can not be registered as a neighbor, so that various settings and assignments can be made unnecessary. In addition, a cell that does not cause handoff between cells needs to be managed, but a specific scheme is not provided.

Korean Unexamined Patent Application Publication No. 10-2004-0041378 (May 17, 2004).

It is therefore an object of the present invention to provide a method and system for managing a cell by confirming validity of a neighboring cell using handoff statistics and inter-cell distance, and recommending an invalid neighboring cell as an object of deletion, And to provide a system and method for managing neighboring cells so that management can be performed.

According to another aspect of the present invention, there is provided a method for managing neighboring cells, the method comprising: collecting neighbor relationship information for one or more cells from a base station or an MS managing the base station; Calculating an inter-cell distance between the target cell and the target cell; Or handoff statistics including a handoff attempt number or a handoff success rate between the serving cell and the target cell.

Comparing the inter-cell distance with a predetermined threshold and extracting the target cell with inter-cell distance less than the threshold; And comparing the handoff statistic with the handoff threshold to extract the target cell in which the handoff statistics are less than the handoff threshold.

And the extracted target cell is deleted from neighboring cells of the neighbor relationship information.

And the threshold value or the handoff threshold value is variable.

Wherein the threshold value is set to a smaller value in a region where the density of the subscriber is higher than in a region where the density of the mobile communication subscriber is small.

And the neighbor relationship information is a neighbor relationship table (NRT).

The MS compares the threshold with the cell distance or the handoff threshold is compared with the handoff statistic by the user to delete the extracted target cell from the neighbor relationship information.

Also, a system for neighboring cell management according to the present invention includes an MS collection processing unit for collecting neighbor relationship information and handoff information for one or more cells from a BS or an MS managing the BS; Calculating handoff statistics including a handoff success rate or a number of handoff attempts between the serving cell and the target cell based on the handoff information and calculating and outputting handoff statistics between the serving cell and the target cell, And outputting the handoff statistics through the output device.

The MS removes the target cell, which is selected by comparing the inter-cell distance with a preset threshold value or the handoff statistic and the handoff threshold value, from neighboring cells of the neighbor relationship information.

Wherein the target cell is one in which the cell distance is less than the threshold,

And the handoff success rate or the handoff attempt number is less than the handoff threshold.

And the handoff threshold value or the threshold value is variable.

The threshold value is set to a small value in a region where the subscriber density is higher than in an area where the density of the mobile communication subscriber is low.

And the neighbor relationship information is a neighbor relationship table (NRT).

The system and method for neighboring cell management according to the present invention check validity of a neighboring cell by using handoff statistics and inter-cell distance, recommend the invalid neighboring cell as an object of deletion, And to enable systemization so that efficient cell management can be performed.

1 is an exemplary diagram illustrating a neighbor cell management method in accordance with the present invention. 2 is a cell configuration diagram for helping understanding.
FIG. 2 is a cell configuration diagram for helping understanding. FIG.
3 is a diagram illustrating a configuration of a neighboring cell management system according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be noted that the drawings denoted by the same reference numerals in the drawings denote the same reference numerals whenever possible, in other drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. And certain features shown in the drawings are intended to be illustrative, not limiting, or reduced, or simplified, and the drawings and elements thereof are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

1 is an exemplary diagram illustrating a neighbor cell management method in accordance with the present invention. 2 is a cell configuration diagram for helping understanding.

Referring to FIG. 1, a neighbor cell management method according to the present invention includes a neighbor relationship information collection step S10, an inter-cell distance calculation step S20, a threshold comparison step S30, a target cell extraction step S40, (S50). Further, the mobile station further includes a handoff statistic collection step S11, a NRT-by-NRT statistical calculation step S21, and a handoff threshold value comparison step S31.

The neighbor relationship information collection step (S10) is a step of collecting neighbor relationship information of each cell for neighboring cell management. In the neighbor relationship information collection step (S10), the NRT (Neighbor Relation Table) held in each cell is collected. Particularly, as shown in FIG. 2, when neighboring cells (N: N1 to N6) neighboring to the serving cell and the serving cell are present, the NRTs for the cells are also collected. That is, when a handoff request is generated from a serving cell, a handoff is performed to request a neighboring cell (N), i.e., a cell to be a target cell, Information is collected.

The inter-cell distance calculation step S20, when the neighbor relation information is collected, divides the serving cell and the target cell based on the neighbor relation information, and calculates the distance of each of the target cells to the serving cell. In particular, when a plurality of remote radio apparatuses (RRHs) are configured to calculate the position of a cell, the position of the cell is calculated by averaging the positions of the remote radio apparatuses.

The threshold comparison step S30 is a step of comparing the inter-cell distance calculated in the inter-cell distance calculation step S20 with a threshold specified by the user. In the threshold value comparison step S30, cells that are not neighboring cells due to overshooting of the serving cell, that is, cells in a range out of the normal coverage, such as cell O9 in FIG. 2, . If a cell O9 beyond the coverage is registered as a neighbor cell due to a temporary reason or the like, a cell beyond the coverage can be set as a target cell when a handoff of the user terminal is required, Therefore, the handoff is not performed and the service provided to the user terminal may be interrupted. Therefore, in the threshold value comparison step S30, the threshold value set by the user is compared with the inter-cell distance to prevent this. Here, the distance set as the threshold value is set differently considering the subscriber density and area characteristics of the area where the serving cell is configured. Specifically, the distance is set to a relatively short distance in a region where the subscriber density is high as shown in the figure, and may be set to a long distance in the region where the subscriber density is low, such as the countryside. In addition, it can be set to a short distance in areas with high obstacles such as mountainous terrain, and a long distance in areas with few obstacles such as coasts and plains.

The target cell extracting step S40 is a step of extracting a cell registered as a neighboring cell or a target cell among cells having a cell distance exceeding a predetermined distance by using a comparison result of the threshold comparing step S30.

In the extraction target cell deletion step (S50), the user selects and deletes all or part of the cells extracted in the target cell extraction step (S50). According to the present invention, an extraction target is selected and provided to a user, and a selected cell is confirmed and deleted by a user, thereby facilitating easy cell management by a user while preventing errors due to automation.

On the other hand, it is possible to improve the accuracy of the neighbor cell management method using handoff.

To this end, the neighbor cell management method further includes a handoff statistical collection step S11, a statistical calculation step S21 for each NRT, and a handoff threshold value comparison step S31.

The method of using the handoff statistics may be performed independently of the steps described above so that a cell selection in parallel with the above-described method may be performed. In addition, the method may be applied together with the above-described method to accurately extract a cell to be deleted Which can be easily selected and changed by those skilled in the art. In the detailed description of the present invention, the processes performed independently will be described in detail.

The handoff statistical collection step S11 is a step of collecting handoff-related statistics between the serving cell and target cells for a neighboring cell, particularly a serving cell. In this handoff statistical collection step S11, the handoff related statistics such as the cell pair (serving cell and target cell) where the handoff occurred, the number of handoff attempts, and the handoff success rate are collected.

The NRT-by-NRT statistical calculation step S21 is a step of calculating handoff statistics of each of the target cells for the serving cell from the collected handoff statistics. In this NRT-by-NRT statistical calculation step S21, the inter-cell handoff statistics of the neighbor relationship are calculated to calculate statistical values for determining whether the handoffs are actively performed among the cells and whether there is no handoff between the cells.

The handoff threshold comparison step S31 is a step of comparing the inter-cell handoff statistics calculated in the NRT-by-NRT statistical calculation step S21 with the handoff threshold. In the handoff threshold comparison step S31, the handoff threshold value set by the user and the inter-cell handoff statistics are compared.

In the target cell extracting step, a neighbor cell having a lower handoff attempt number or a handoff success rate than the handoff threshold value is extracted.

Accordingly, it is possible to efficiently manage the cell by preventing a situation where a handoff does not occur, a replaceable cell is registered as a neighbor cell, an erroneous handoff occurs, or a necessary cell can not be registered as a neighbor.

3 is a diagram illustrating a configuration of a neighboring cell management system according to the present invention.

Referring to FIG. 3, the neighboring cell management system according to the present invention includes an EMS collection processing unit 20, a user input processing unit 30, an algorithm processing unit 50, and a database 40.

An element management system (hereinafter, referred to as 'EMS') 10 is configured to manage a mobile communication network, in particular, a base station (eNB) of an LTE network. The EMS 10 includes a server and collects failure alarms, statistics, and configuration information of the base station, and performs an inquiry and control of the equipment status by the operator. In particular, the EMS 10 collects and provides the information requested by the EMS collection processing unit 20, collects the neighbor relationship information and the handoff statistical information, and transmits the collected information to the EMS collection processing unit 20. Also, the EMS 10 transmits information such as cell information, cell ID, physical cell ID, location information, presence / absence of opening, and RRH information to the EMS collection processing unit 20 together with the handoff statistical information. In particular, when the cell to be deleted is selected by the user or the algorithm processing unit 50, the EMS deletes the selected cell from the neighbor cell list of the NRT information held in the neighbor registered cell.

The EMS collection processing unit 20 receives the equipment information and the neighbor relationship information, in particular, the NRT through the EMS 10, and delivers it to the algorithm processing unit 50 or the database 40.

The user input processor 30 receives a threshold value for cell extraction, a handoff threshold, a serving cell selection command, and a command for selecting a cell to be deleted among extracted cells, and transmits the command to the algorithm processing unit 50. Also, the user input processing unit 30 transmits the information of the serving cell and the target cell input from the user to the algorithm processing unit 50. Specifically, information such as the location information of the serving cell and the target cell and information such as the cell ID can be input from the user. When such an input occurs, the input information is transmitted to the algorithm processing unit 50 or the database 40. The user input processing unit 30 may be configured to include a browser interface 31 for easily inputting a user and effectively providing a processing result, but the present invention is not limited thereto.

The database 40 stores and manages the information transmitted by the EMS collection processing unit 20 and the user input processing unit 30 and the information processed by the algorithm processing unit 50 and includes an algorithm processing unit 50, 30 to provide the stored information.

The algorithm processing unit 50 collects neighbor relationship information and handoff information for extracting cells to be deleted among neighboring cells registered in the serving cell by the process of FIG. 1 described above, The handoff statistics including the number of handoff attempts or the success rate between the serving cells is calculated and provided to the user.

Specifically, the algorithm processing unit 50 receives neighbor relationship information or handoff statistics collected from the EMS collection processing unit 20. Then, the algorithm processing unit 50 calculates the inter-cell distance and the statistical calculation for each NRT using the provided information. In addition, the algorithm processing unit 50 calculates handoff statistics including a handoff start rate or a handoff success rate of a cell pair having a serving cell and a target cell relationship from the handoff information. Then, the algorithm processing unit 50 outputs the calculated handoff statistics and the inter-cell distance to the user by outputting using the output device.

Meanwhile, the algorithm processing unit 50 compares the calculated handoff statistics or inter-cell distance with a previously input threshold value or a handoff threshold value, extracts cells having a value less than the threshold value, provides the extracted cell information to the user, The EMS 10 may be controlled to delete the cell selected by the input from the neighboring cell, but this does not limit the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, . ≪ / RTI > Accordingly, such modifications are deemed to be within the scope of the present invention, and the scope of the present invention should be determined by the following claims.

10: EMS
20: EMS collection processing unit
30: User input processor
31; Browser Interface
40: Database
50:

Claims (13)

Collecting neighbor relationship information for one or more cells from a base station or an MS managing the base station;
Calculating each inter-cell distance between the serving cell and one or more target cells recorded in the neighbor relationship information;
Collecting handoff statistics including the number of handoff attempts between the serving cell and the at least one target cell;
Comparing the inter-cell distance with a predetermined threshold to extract a target cell in which the inter-cell distance exceeds the threshold; And
And comparing the handoff statistics with a predetermined handoff threshold to extract a target cell in which the handoff statistics are less than the handoff threshold,
Wherein when the neighbor relationship information includes information on a plurality of remote radio apparatuses (RRHs), neighboring cell management for calculating a position of a target cell by averaging positions of the plurality of RRHs Way. delete The method according to claim 1,
Wherein the extracted target cell is deleted from neighboring cells of the neighbor relationship information. The method of claim 3,
Wherein the threshold or the handoff threshold is variable. The method according to claim 1,
The threshold
Wherein a region where the density of the subscriber is higher than a region where the density of the mobile communication subscriber is low is set to a smaller value. The method according to claim 1,
Wherein the neighbor relationship information is a neighbor relationship table (NRT). 5. The method of claim 4,
The above-
And comparing the handoff threshold with the handoff statistic to delete the extracted target cell from the neighbor relationship information. An MS collection processing unit for collecting neighbor relationship information and handoff information for one or more cells from a BS or an MS managing the BS; And
A handover success rate or number of handoff attempts between the serving cell and the at least one target cell from the handoff information, Off statistics and outputting the computed inter-cell distance and the handoff statistics through an output device,
A target cell selected by a comparison of the inter-cell distance with a preset threshold or a comparison of the handoff statistics and a handoff threshold is removed from neighboring cells of the neighbor relationship information,
When calculating the inter-cell distance, when neighboring relation information includes information on a plurality of remote radio apparatuses (RRHs), calculating a position of a target cell by averaging the positions of the plurality of RRHs system. delete 9. The method of claim 8,
Wherein the target cell is a cell in which the inter-cell distance exceeds the threshold,
Wherein the handoff success rate or the number of handoff attempts is less than the handoff threshold. 11. The method of claim 10,
Wherein the handoff threshold or the threshold is variable. 9. The method of claim 8,
The threshold value may be,
Wherein a region where the subscriber density is high is set to a small value as compared to a region where the density of the mobile communication subscriber is low. 9. The method of claim 8,
Wherein the neighbor relationship information is a neighbor relationship table (NRT).

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