Method and system for eliminating SRS interference between different cell users in multi-point coordination

Abstract

The invention discloses a method for eliminating sounding reference signal (SRS) interference between different cell users in multi-point coordination, which comprises the following steps of: configuring same virtual cell identifier for user equipment (UE) performing multi-point coordinated transmission in the same multi-point coordinated transmission cell, and informing the UE performing the multi-point coordinated transmission in various cells of the virtual cell identifier; and generating sounding reference signals (SRS) by using the UE performing the multi-point coordinated transmission on the basis of the virtual cell identifier and sending to the network side. In the technical scheme, SRS sequences of the UE in different cells of the same CoMP set are generated on the basis of the same virtual cell identifier (ID), so the generated SRS sequences of the UE have good orthogonality, bearing positions are not limited when the SRS resources are configured for the cells in the CoMP set, different cyclic shifts are only configured for the SRS sequences of different UE in the CoMP cells occupying the same time frequency resource, and the interference between the SRS can be eliminated.

Description

technical field [0001] The present invention relates to a technique for eliminating interference of sounding reference symbols (SRS, Sounding reference symbol) between users of different cells in Coordinated Multi-point (CoMP, Coordinate Multi-Point), in particular to an advanced long-term evolution (LTE-A, Long Term Evolution- A method and system for eliminating sounding reference symbol interference between users in different cells in an Advanced) system. Background technique [0002] With the continuous improvement of people's requirements for future communication, more attention is paid to the spectral efficiency of the cell edge, and how to improve the transmission quality and throughput of the cell edge has become a subject of competing research. Coordinated multi-point transmission technology uses the cooperative transmission of multiple cell transmit antennas, which can effectively solve the interference problem at the edge of the cell, thereby improving the capacity...

AI Technical Summary

Problems solved by technology

In this way, the SRS sequences sent by UEs in different cells generated based on different base sequences are not orthogonal, and there will be a lot of interference between SRSs sent by different UEs, which will lead to the degradation of channel detection performance on the base station side, and further reduce the CoMP transmission quality

[0006] For the above problem, some companies proposed that, for the SRS of UEs in different cells in the CoMP set, they should be transmitted in a time-division or frequency-division manner to avoid SRS interference of UEs in different cells. SRSs are sent on different subframes, so that the channel state information measured by the base station corresponds to the channel information of UEs in different cells at different times, which has a certain impact on CoMP transmission. In addition, this will also bring certain impact on SRS scheduling. However, if the frequency division method is used, that is, the SRSs of UEs in different cells are sent on different resource blocks (RB, Resource Block), this will cause waste of frequency resources, and the channel state information obtained by the base station side belongs to different Frequency band, which will also have a certain impact on CoMP transmission

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