Fractional Frequency Multiplexing Method for Hierarchical Heterogeneous LTE System Based on Intermediary Region Optimization

Abstract

The invention discloses a hierarchical heterogeneous LTE system fractional frequency multiplexing method based on intermediary area optimization, which divides a macro cell into K sectors as required, and then divides the macro cell into a central area and an intermediary area from inside to outside. And the edge area, a total of 3K sub-areas, and then carry out the spectrum pre-allocation of the macro base station user MUE in each sub-area according to the spectrum allocation principle of the macro base station user MUE, and carry out the sub-area in each sub-area according to the spectrum allocation principle of the secondary base station FBS For the spectrum pre-allocation of the base station FBS, the optimal outer radius of the intermediary area is determined by the method of determining the optimal outer radius of the intermediary area based on interference probes, and finally the final division of the macro cell area and spectrum allocation are completed. By adopting the present invention, by optimizing the radius of the intermediary area, the macro cell area division with low cross-layer interference and high spectrum utilization rate can be realized, and the interference can be reduced by dividing the spectrum between the macro base station users and the secondary base stations in each sub-area , improve system throughput.

Description

technical field [0001] The invention belongs to the technical field of layered heterogeneous LTE communication, and more specifically, relates to a method for fractional frequency multiplexing of a layered heterogeneous LTE system based on intermediary region optimization. Background technique [0002] With the widespread deployment of LTE systems in real life, in order to improve the service quality of cell edge users and cell throughput, low transmission power secondary base stations (Femto-Cell Basestation, FBS) and macro base stations (Macro-CellBasestation, MBS) coexist The hierarchical heterogeneous network scheme has been widely used. The secondary base station FBS uses the licensed frequency band of the mobile network operator, and can deploy an orthogonal pattern in which different subbands are assigned to the macro cell and the secondary cell respectively to avoid interference, but at the cost of low network capacity and low spectrum utilization rate. The seconda...

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Problems solved by technology

However, the frequency utilization rate of this scheme is low, which greatly weakens the load capacity of the cell and copes with the sudden increase of users.

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