Method for selecting switching object cell and base station controller

Abstract

The present invention provides a method and base station controller that chooses to switch the target community. This method includes: when the base station controller is configured to switch the neighboring area data, if the same frequency neighbor area is detected, a neighboring area in the same frequency neighbor is set up.Or in multiple related communities, the relevant communities are non -intensive neighbor areas in the service community; the base station controller switches the judgment based on the survey report reported by the user terminal to obtain the switching candidate community.There is a neighbor area in the same frequency, and the target community is selected according to the situation of the neighborhood and the presets in the same frequency neighbor area.The invention can effectively reduce the possibility of switching towards the same frequency neighbor area through the sign of the neighboring neighboring area and setting up related communities in the neighborhood of the same frequency.Differential switching times, reduce the user terminal switching ratio.

Description

technical field [0001] The present invention relates to the technical field of inter-cell handover in a GSM (Global System for Mobile communication) wireless network system, in particular to a method for selecting a handover target cell and a base station controller. Background technique [0002] Due to the small number of frequency points available for use, it is inevitable to configure adjacent cells of the same frequency and different colors for a cell in network planning, so that if a user terminal talks in this cell and performs handover, it will be interfered by the same frequency , resulting in poor downlink quality and call drop after switching. Such as figure 1 In the scenario shown, there are 5 cells in total, and the relationship between cells is as follows: [0003] Cell A is the current serving cell; [0004] The four cells B, C, D, and E are neighbors of A; [0005] The two cells B and C have the same frequency and different colors. [0006] During the cal...

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Problems solved by technology

[0006] During the call of the user terminal, the current serving cell is cell A. When moving to area 1, area 2, or area 3, the BSC (Base Station Controller, base station controller) handover decision is established. According to the adjacent cell frequency point in the adjacent cell measurement report The list index value and BSIC (Base Station Identification Code, base station identification code) can get the existence of the same frequency neighbor cell (there is only one same frequency neighbor cell in the same measurement report, and the frequency point list index of the same frequency neighbor cell in different measurement reports is the same, BSIC different), if two co-frequency adjacent cell levels are phase-superimposed, the level parameter value of the same-frequency adjacent cell in the adjacent cell measurement report reported by the user terminal will be enhanced, and the handover decision is likely to select the same frequency The neighbor cell is the target cell for handover, but it is not sure which co-frequency neighbor cell is selected

If the user terminal is currently in area 1 and is moving towards the coverage area of ​​cell B, according to the actual plan, cell B should be selected as the handover target cell, but cell C is selected; or the user terminal is currently in area 3 and is moving towards the coverage area of ​​cell C According to the actual plan, cell C should be selected as the handover target cell, but cell B is selected. In this way, the level of the adjacent cell measured before the handover is very good. Interference, sudden change in downlink quality, resulting in poor quality and call drop

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