Moving-load balancing method based on efficacy function in LTE (long term evolution) self-organized network

Abstract

The invention provides a moving-load balancing method based on an efficacy function in an LTE (long term evolution) self-organized network. The method comprises the following step of calculating efficacy functions in all adjacent cells of an unsatisfied user in an overload cell. If all the efficacy function values of the unsatisfied user equal to 0, the user does not switch a target cell, and the user is in a status of congestion or wire off; and otherwise, an adjacent cell with a maximum efficacy function value is selected to carry out switching. According to the method, an admittance control condition in a target cell is selected to be converted into a part of the efficacy function based on A3 inequality triggered switching, and a switching selection process of the unsatisfied user is simplified by combining the adjacent cell spectrum efficiency and a subnet loading balanced index. By the adoption of the efficacy function, the adjacent cell information channel and the loading situation of a peripheral user are clearly expressed, so that an approximate direction of a cell where the user is located is indirectly shown, the unsatisfied user is enabled to directly select the current most excellent target cell to carry out switching in a complex scene, and a successful rate and the efficiency of switching are greatly improved.

Description

technical field [0001] The invention relates to a system-level network simulation of a wireless communication system, in particular to a mobile load balancing algorithm for multiple users in an LTE self-organizing network (SON). Background technique [0002] The mobile load balancing (MLB) problem in LTE SON network means that the wireless cellular system can detect the overloaded cell without manual intervention, and automatically execute the load balancing algorithm to transfer part of the business in the overloaded cell to the relatively light load. Go to the neighborhood. The load transfer is mainly realized through the specific means of switching. In actual engineering, the A3 event is generally used to trigger the measurement report of LTE intra-frequency handover, and the coverage of the cell is indirectly changed by adaptively modifying the relative offset CIO of the cell and the hysteresis parameter Hyst, so that users with poor channel conditions at the edge of th...

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Problems solved by technology

Usually, load balancing is performed for unsatisfied users at the edge of the cell. However, when the scene is more complex, for example, there are multiple adjacent hotspot cells in the network, not all edge users of the hotspot cells have good neighbors for backup. Handover, although the traditional A3 inequality can determine whether the user is located at the edge of the cell, it cannot directly identify the direction of the cell where the user is located and the load status of the adjacent cell

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