Cooperative precoding method, cooperative information interaction method and system

Abstract

The invention discloses a cooperative precoding method, a cooperative information interaction method and a system. The system comprises a first base station to which a first cell belongs and a first user terminal served by the first cell, a second base station to which a second cell belongs and a second user terminal served by the second cell; in the same fragment of time frequency resource, the first base station pre-codes a to-be-transmitted symbol of the first user terminal in the first cell by using a first precoding weight and transmits data to the first terminal; the second base station pre-codes a to-be-transmitted symbol of the second user terminal in the second cell by using a second precoding weight and transmits data to the second terminal; and the first precoding weight and the second precoding weight are in an orthogonal relation. Orthogonal cooperative precoding is adopted among the cells, and the purpose of eliminating interference is fulfilled by using the orthogonality of the receiving space.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a cooperative precoding method, a cooperative information interaction method and a system. Background technique [0002] In a wireless communication system, the edge of a cell (CELL) may receive signals from multiple cells other than the serving cell, resulting in strong interference. At this time, the SINR (Signal Interference Noise Ratio, power ratio of signal to interference noise) of the wireless signal received by the receiving terminal at the edge of the cell is relatively low, so the transmission performance of the user at the edge of the cell will be relatively poor. [0003] Such as figure 1 As shown in , a schematic diagram of a scenario where a cell edge user is interfered is given. In a wireless communication system, when each cell / base station uses the same time-frequency domain resource location to transmit data, the signal sent by base statio...

AI Technical Summary

Problems solved by technology

This technology can better eliminate interference, which relies on the channel information feedback from UE1 to eNodeB2, and needs to feed back channel information of each frequency domain subband (Subband), which increases the feedback amount of the uplink channel; and, because it is at the edge of the cell, The user's feedback accuracy will also be affected

[0007] Therefore, the problems existing in the existing cooperative beamforming technology based on spatial interference cancellation include: (1) Compared with the case of a single cell, the UE needs to feed back additional channel information, which cannot be transparent in mode, and needs to design a new mode. The completed standard version cannot support this technology; (2) Additional uplink channel feedback overhead needs to be added; (3) Since UE1 is located at the edge of the cell, when UE1 measures the channel between eNodeB2 and eNodeB2, it will bring a certain channel estimation error, Quantization of the estimated channel information fed back will also bring certain errors; (4) eNodeB2 needs to ensure the transmission quality of UE2 while not interfering with UE1, and the two channels need to have good orthogonality , so it is necessary to select the appropriate UE2 during scheduling, which will bring certain scheduling restrictions

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