Method and system for cooperative set selection in cooperative multipoint communication

Abstract

The invention provides a method for selecting a cooperative set in the cooperative multipoint communication. The method comprises the following steps of configuring a nonzero power CSI-RS (Channel State Indication Reference Signal) pattern to each transmission point in a measuring set, configuring REs (Resource Elements) of other transmission points into a mute state at a position corresponding to a CSI-RS of each transmission point, and configuring a small number of PDSCH REs (Physical Downlink Shared Channel Resource Elements) of each transmission point at the same position into a mute state; according to acquired reference signal receiving power of the CSI-RS of each transmission point and the sum of interference and noise outside the measuring set, which are inquired from the mute PDSCH REs, calculating approximate single point CQIs (Channel Quality Indicator) of each transmission point by cooperative UE (User Equipment); and finally, on the basis of the approximate single point CQIs of each transmission point, determining which points in the measuring set are selected into the cooperative set. The method not only solves the problem of deficiency of accuracy, which is caused by the case of not considering the CQIs and interference, but also solves the problem of excessively high complexity caused by the case of carrying out channel estimation and calculating the single point CQIs at the UE end, so that good balance is obtained on the aspects of accuracy and complexity and a CoMP (Cooperative MultiPoint) system is simpler and also has more reliable performance.

Description

technical field [0001] The present invention relates to coordinated multi-point communication (CoMP, Coordinated Multi-point) in wireless communication, especially to a method for selecting a cooperative set Background technique [0002] LTE-Advanced (Long Term Evolution-Advanced, next-generation long-term evolution technology), as a mainstream communication technology of 4G, has attracted more and more attention from communication manufacturers. In the LTE-Advanced system, the Orthogonal Frequency Division Multiple Access (OFDMA) access method is used in the downlink to carry the user information in the cell on different subcarriers that are orthogonal to each other, thereby avoiding The multiple access interference between users in the cell cannot suppress the inter-cell interference received by edge users. Especially in a cellular system with a frequency reuse factor of 1, the useful signal strength received by edge users is small, while the interference signal strength ...

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Problems solved by technology

But when the measurement set is relatively large, such as the number of transmission points N=9, the complexity of calculating accurate single-point CQI will be very high for the UE; and the calculation of single-point CQI also requires the UE to perform channel estimation to obtain Useful signal power, which greatly increases the complexity and burden of the UE itself

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