Heterogeneous wireless network uplink interference suppression method based on association control

Abstract

The invention discloses a heterogeneous wireless network uplink interference suppression method based on association control. The method mainly solves the problem about how to conduct association control on users so as to reduce cross-layer interference between macro cells and home cells and improve network performance when home base stations are opened and the users have access to the home base stations. The method includes the steps that mathematical description is conducted on the problem, and modeling is conducted on the problem to form an optimization problem with an objective function as the system throughput; due to the fact that the problem is an NP-Hard problem, the solution to the problem is divided into two parts, firstly, all the base stations perform sub-channel allocation so as to achieve interference coordination, and then a central controller performs access control on the users according to path gain information fed back by all the base stations so as to achieve interference transfer. Thus, the solution to the problem is obtained through a mode which can be implemented. Through interference coordination and interference transfer, finally the method reduces cross-layer interference of heterogeneous wireless network uplinks and improves the network throughput. The method can be applied to association control and interference suppression of the heterogeneous wireless network uplinks.

Description

technical field [0001] The invention belongs to the technical field of communication, relates to association control and interference suppression in an OFDMA system, and particularly relates to a two-layer heterogeneous wireless network composed of a macro cell and a home cell in the OFDMA system. When the home cell adopts an open access mode, in order to reduce Cross-layer interference, improving network throughput, an uplink interference suppression method based on association control for all users in the system. Background technique [0002] Heterogeneous wireless network technology, especially the heterogeneous wireless network composed of macro cells and home cells, can meet today's rapidly growing data service requirements, reduce operating costs, increase the capacity of the entire system, and improve communication quality and reliability. At the same time, the deployment of the home base station can reduce the load of the macro base station, reduce the power loss of ...

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Problems solved by technology

In the article "Uplink power control and base station association in multichannel cellular networks" of IEEE International Conference on Game Theory for Networks, 2009, C.Singh et al. studied the joint association control and power control technology of CDMA system uplink multi-channel multi-cell network , where each cell only uses one channel. From the perspective of game theory, the optimal transmit power after users access a certain base station is used as the penalty item to obtain distributed association control and power adjustment. The equilibrium solution and system optimality in both cases and infinite, although the algorithm focuses on the uplink, the CDMA system studied

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