Inter-station interference coordinating and pre-coding scheme for multi-antenna OFDMA system

Abstract

The invention provides an inter-station interference coordinating and a pre-coding scheme for a downlink multi-antenna OFDMA system, which aims to solve the problems of the existing dynamic coordinating and pre-coding scheme. In the scheme, special compatible time frequency resources with identical numbers are configured in advance for each community in a network, and the compatible time frequency resources configured for each community in the network are different from the compatible time frequency resources for each community in an interference coordinating community cluster. During coordination, if the current resources are identical to the compatible time frequency resources configured for the community, the coordinating and pre-coding message is transmitted to the community in the interference coordinating community cluster according to feedback channel information from edge user terminals of the community; and if the current resources are identical to the compatible time frequency resources configured for the coordinating community registered by the community, the coordinating and pre-coding message transmitted by the coordinating community is received, and the coordination is implemented. Since the compatible time frequency resources are configured for each community, each community has the opportunity to improve the channel quality of the edge user terminals of the community, and reduce the inter-station interference.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to an interference coordination precoding scheme between base stations for a multi-antenna OFDMA system. Background technique [0002] In the LTE (Long Term Evolution, Long Term Evolution) system, when a base station configured with multiple antennas performs beamforming, it selects a precoding weight vector according to the spatial channel condition fed back by the user terminal, without considering the beams used by neighboring cells. [0003] In the LTE-Advanced system, in order to further improve cell edge performance, an advanced CoMP (Coordinated Multi-Point, Coordinated Multi-Point) transmission technology needs to be adopted. Among them, the downlink CoMP technology is divided into the following two categories: [0004] (1) Joint processing technology: multiple transmission nodes transmit data for user terminals at the same time, so that the original interferen...

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Problems solved by technology

[0010]In the static coordinated precoding scheme, the adjacent cell unconditionally accepts the precoding matrix recommended by the user terminal, sacrificing a lot of space resources of the own cell, and cannot ensure the coordination of the precoding scheme effectiveness

In the dynamic coordinated precoding scheme, the precoding matrix recommended by the user terminal is conditionally accepted by sharing the difference CQI between the base stations. When the user terminal is subjected to multiple interference sources, it cannot be ensured that each coordinating cell accepts the precoding matrix recommended by the user terminal. Precoding matrix, which cannot optimally improve the channel quality of the user terminal

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