Interference reduction method based on single-frequency-band clustering in ultra-dense network

Abstract

The invention discloses an interference reduction method based on single-frequency-band clustering in an ultra-dense network, which is suitable for an ultra-dense network adopting CoMP. A topologicalstructure figure is built on the basis of the geographic positions of users; nodes represent the users; two users which are positioned at two adjacent small cells with a distance being less than or equal to a certain value are connected through a line; a shortest edge is found in the topological structure figure in sequence; user clusters are obtained according to different degrees of the two nodes; small base stations of small cells in which users in the user clusters are positioned are placed in a service base station cluster; a frequency band is divided into a plurality of sub-frequency bands according to the occurrence times of each small base station in the base station cluster; different sub-frequency bands are allocated to the users who serve for each small base station and are positioned in different user clusters; the average value of path loss from each user to the small base stations in each base station cluster is calculated at the interval of a plurality of time slots, andthe users are clustered once again according to the average value.

Description

technical field [0001] The invention relates to the communication field, in particular to an interference reduction method based on single frequency band clustering in an ultra-dense network. Background technique [0002] Ultra Dense Network (UDN, Ultra Dense Network) is one of the key technologies of the next generation mobile communication. UDN achieves the purpose of improving system capacity by deploying a large number of low-power small base stations. If small base stations use the same frequency band, there will be serious interference, so interference mitigation is one of the key technologies of UDN. [0003] Existing interference mitigation methods in the UDN are divided into clustering, resource allocation, Coordinated Multiple Point transmission (CoMP, Coordinated Multiple Point) and the like. The entire network is divided into several clusters through clustering, and each cluster contains several small base stations. In the first proposed clustering method, sma...

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Problems solved by technology

This document also points out that if the location of the user changes, the cluster in which the user's serving small cell is located should be changed according to the sum of the user's intra-cluster interference power and the sum of the inter-cluster interference power. However, this document does not give a specific Clustering method and sub-band allocation method

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