KR19980074411A - Method of processing location information of micro cell for overload cell control in mobile communication system - Google Patents

Abstract

The present invention is to check the load status of a plurality of micro-cells managed by the base station, if an overload cell is detected to quickly determine the position of neighboring cells according to the location information table for each microcell prepared in advance to search their minimum load cell As a result, a method of processing location information of a micro cell for overload cell control in a mobile communication system capable of rapidly distributing high-density traffic applied to a specific cell to an adjacent cell is provided.

Description

Method of processing location information of micro cell for overload cell control in mobile communication system

The present invention relates to a method for processing location information of a micro cell for overload cell control in a mobile communication system. In particular, the present invention relates to a micro cell managed by a base station as one of the basic structures of personal mobile communication and wireless multimedia mobile communication. A location information management function.

In general, a mobile communication system is composed of a base station manager (BSM), a base station controller, a base transceiver subsystem, and a mobile station. They are each organized in a layered form. The base station cooperates with the call control processor of the control station to control the call. However, according to the related art, when the micro cell belonging to the base station is overloaded, the call can no longer be received, thereby increasing the call loss rate. In other words, in order to reduce excessive traffic concentrating on a specific micro cell, the minimum load cell should be selected by identifying location information of adjacent micro cells. However, in the conventional technology, there is no such method, thereby increasing the call loss rate. Therefore, in order to distribute the traffic of the overload cell, there is a need for a method of storing and retrieving location information of all micro cells managed by the base station in advance.

Accordingly, the present invention can be used to determine the location of all the micro cells managed by the base station and the existence of the adjacent cells by using the location of the micro cell and the location information of the micro cell neighbor cell managed by the base station, thereby overloading a specific cell An object of the present invention is to provide a method for processing location information of a micro cell for controlling an overload cell in a mobile communication system so that traffic can be solved.

According to an aspect of the present invention, there is provided a method for determining a load state of a cell, setting a position of an overload cell after checking a load state of the cell, and checking the load state of the cell. And searching for the minimum load cells for the two adjacent cells.

1 is a structural diagram of a mobile communication system to which the present invention is applied.

2 is a configuration diagram of a micro cell managed by a base station.

3 is a block diagram illustrating a connection between a base station and a micro cell.

4 is a location information table of a micro cell.

5 is a flow chart of position search of a micro cell.

Explanation of symbols for the main parts of the drawings

1: control station 2: base station

3: cell area 4: mobile switching center

5: Home position register 6: Control station operating maintenance device

11: micro cell 12: micro cell management block

13: Cell position information table 14: Overload control block

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

1 is a structural diagram of a mobile communication system to which the present invention is applied. BSC-base station controller (1), BTS-base transceiver subsystem (2), cell site (3) where mobile subscriber is located, and MSC-mobile services switching center 4), a home position register (HLR) 5, and a BSM-base station manager.

The control station operating maintenance device 6 is responsible for performing the operation and maintenance functions of the control station 1 and the base station 2. The control station 1 is in charge of wired and wireless link control signal processing, call control, operation and maintenance of the control station and base station apparatus. The control station 1 has a call control processor that is in charge of the call control function. One control station 1 can accommodate a plurality of base stations 2. The base station 2 routes or transmits and receives control information through interworking with the call control processor of the control station 1 and routes or transmits and receives traffic information of a plurality of mobile stations. The mobile switching center 4 performs a station number translation and routing function of connecting the subscriber call transmitted from the control station 1 with the receiving side. The home location register 5 stores the current location information of the mobile subscriber and performs the function of providing the subscriber's location in response to a request for information from the mobile switching center 4.

2 is a configuration diagram of a micro cell managed by a base station. A generalized cell model in the form of a 5x5 matrix, consisting of 25 microcells managed by one base station. The coordinate of the first microcell is (0, 0) and the next microcell is (0, 1). In this way, the last cell has a coordinate of (4, 4). On the other hand, the coordinates of the cells (0, 0), (0, 4), (1, 4), (3, 4), (4, 0), (4, 4) exist in the cell that is not managed by the base station Assuming a case, we define it as an empty cell. The order of adjacent cells around the microcell is perceived clockwise. That is, the order of adjacent cells of a microcell whose cell coordinates are (1, 1) is that the 0th cell is (0, 2), the 1st cell is (1, 2), and the 2nd cell is (2, 2). And the fifth cell (0, 1).

3 is a block diagram illustrating a connection between a base station and a micro cell. The micro cell management block 12 in the base station 2 periodically collects 32 cell state information for all micro cells 11 registered in the cell position information table 13. When it is determined that a particular cell is in an overloaded state based on the collected cell state information, the cell position information table 13 retrieves cell position information 33 to search for a position of an adjacent cell of the corresponding overloaded cell 34. The result (overload cell and minimum load cell information) is provided to the overload control block 14 (35).

4 is a table of location information of a micro cell, which stores location information of all micro cells managed by a base station. The location information includes a micro cell allocation management number, an X axis number, a Y axis number, the presence of six adjacent cells, a load threshold value, and the like. If the coordinate is (0, 0), it indicates the microcell (0, 0) of FIG. 3 and has cell presence information for six adjacent cells of (0, 0). The cell present field is information indicating whether the cell exists. If Y is present, the cell exists. Conversely, if N, the cell does not exist. -If is null data. The fields from the cell-0 to the cell-5 are information indicating the presence or absence of the 0 th to 5 th neighboring cells and indicate the presence or absence of six cells adjacent to the micro cell. Especially in case of N, the traffic load is calculated as the upper limit (90%). In this situation, since the corresponding cell does not exist, the handoff cannot be performed. Therefore, the overload is likely to occur. The load threshold field may change the load lower limit value in advance for an overload cell that frequently occurs during operation to distribute traffic of the overload cell to neighboring cells, thereby efficiently controlling the traffic. This is shown in the table below.

[table]

order X coordinate Y coordinate Cell existence Adjacent cell presence Load threshold Cell-0 Cell-1 Cell-2 Cell-3 Cell-4 Cell-5 One 0 0 N - - - - - - - 2 0 One Y N Y Y Y N N 90/51 3 0 2 Y N Y Y Y Y N 90/51 4 0 3 Y N Y Y Y Y N 90/51 5 0 4 N - - - - - - - 6 One 0 Y Y Y Y Y N N 90/51 7 One One Y Y Y Y Y Y Y 90/51 8 One 2 Y Y Y Y Y Y Y 90/51 9 One 3 Y N N Y Y Y Y 90/51 10 One 4 N - - - - - - - 21 4 0 N - - - - - - - 22 4 One Y Y Y N N Y Y 90/51 23 4 2 Y Y Y N N Y Y 90/51 24 4 3 Y Y Y N N Y Y 90/51 25 4 4 N - - - - - - -

FIG. 5 is a flow chart of retrieving the location of an adjacent cell having the minimum load in the table of FIG.

When the cell state information is received from the cell management block from the start signal (101), the load state of the cell is retrieved (102) by the load threshold of FIG. The load state is checked (103) and ends if normal (104). In the case of an overload condition, the starting point of the location information table is set (105). The cell position is selected from the starting point to check the X and Y coordinates (106). Check whether the corresponding overload cell exists (107) and terminate if it does not exist, and if the cell exists, set the position to an initial value (i = 0) to search for the minimum load cell among six adjacent cells (108). ). The existence of the adjacent cell is checked (109) and if there is a minimum load cell (110). According to the presence or absence of the minimum load cell (111), if the cell exists, the location of the minimum load cell is stored (112), and the location of the minimum load cell is provided to the overload control block (113). If the cell does not exist, the minimum load cell is changed (114). In addition, by increasing the location of the neighboring cell (115) and determining whether or not the end of the location search is completed (116), if the search is not completed for all neighboring cells, the step 109 of repeatedly checking whether the neighboring cell is present is repeated. If the search is completed for all neighboring cells, the process ends.

As described above, according to the present invention, when the overload cell is detected by checking the load state of a plurality of microcells managed by the base station, the minimum load cell is quickly identified by checking the positions of neighboring cells according to the prepared location information table for each microcell. You can search for This technique allows high-density traffic to a particular cell to be quickly distributed to adjacent cells, minimizing call loss. Therefore, there is an excellent effect to increase the capacity of the call to improve the performance of the system and the high reliability of the mobile communication system.

Claims (4)

A first step of checking the load state of the cell, A second step of setting a position of an overload cell after checking a load state of the cell; And a third step of searching for the minimum load cells for six adjacent cells according to the overload cell position and the neighbor cell position information table. The method of claim 1, wherein the overload cell position and the neighbor cell position information table comprise the following table. [table] order X coordinate Y coordinate Cell existence Adjacent cell presence Load threshold Cell-0 Cell-1 Cell-2 Cell-3 Cell-4 Cell-5 One 0 0 N - - - - - - - 2 0 One Y N Y Y Y N N 90/51 3 0 2 Y N Y Y Y Y N 90/51 4 0 3 Y N Y Y Y Y N 90/51 5 0 4 N - - - - - - - 6 One 0 Y Y Y Y Y N N 90/51 7 One One Y Y Y Y Y Y Y 90/51 8 One 2 Y Y Y Y Y Y Y 90/51 9 One 3 Y N N Y Y Y Y 90/51 10 One 4 N - - - - - - - 21 4 0 N - - - - - - - 22 4 One Y Y Y N N Y Y 90/51 23 4 2 Y Y Y N N Y Y 90/51 24 4 3 Y Y Y N N Y Y 90/51 25 4 4 N - - - - - - - Where Y is a cell, N is a cell, and-is meaningless data. The method of claim 1, wherein the second step comprises: checking a load state of the cell and ending if it is in a normal state; Selecting a cell position from the starting point of the position information table to confirm the X, Y coordinates, the location information processing method of the micro cell for overload cell control in a mobile communication system. The method of claim 1, wherein the third step is performed to check whether the corresponding overload cell exists and terminates if the cell does not exist, and sets the position as an initial value to search for the minimum load cell among six adjacent cells. To do that, Checking the existence of the neighboring cell to determine whether it is the minimum load cell, and if the cell exists according to the presence of the minimum load cell, storing the position of the minimum load cell and providing the position of the minimum load cell to the overload control block; , Determining the end of the position search by changing the minimum load cell and increasing the position of the neighboring cell if the cell does not exist by checking the existence of the neighboring cell; If the search is not completed for all the neighboring cells according to the determination result, repeating the step of checking the presence of the neighboring cell is repeated, and if the search is completed for all the neighboring cell is characterized in that the mobile communication Method of processing location information of micro cell for overload cell control in system.