A downlink data transmission method between a relay node and a UE

Abstract

The invention provides a method for transmitting downlink data between a relay node and UE (User Equipment). The method comprises steps: for the UE within the coverage of any RN (Relay Node), an eNodeB directly notifies the RN and the UE, and the UE sends time frequency resources and parameters of an SRS (Surveillance Reference Signal); the UE sends the SRS according to the notification sent by the eNodeB; the RN receives the SRS according to the notification sent by the eNodeB and obtains wireless channel features between the UE and the RN according to the SRS; and according to the wireless channel features, the RN performs beam-forming, time frequency synchronous fine adjustment and power control on the downlink signals sent to the UE. By the application of the method, the RN performs the beam-forming on a downlink forwarding service channel self-adaptively according to the detection on the SRS without adding uplink and downlink signallings so that the downlink data transmission performance is improved greatly, the data receptivity of the UE and the wireless system performance are improved, and the wireless interference around the RN coverage is reduced.

Description

technical field [0001] The invention relates to relay technology in a communication system, in particular to a downlink data transmission method between a relay node and a UE. Background technique [0002] The relay node (RN) is an intermediate node between the base station and the terminal. It receives and enhances the transmission of uplink and downlink signals to increase system coverage, improve system capacity, and improve user experience. The RN communicates with the eNodeB through the Un port, and the RN communicates with the UE through the Uu port. For example, figure 1 shown. [0003] RN can flexibly increase the coverage of blind spots, indoor coverage, extend new area coverage, and enhance high-speed data coverage in the area. It can also realize rapid temporary network deployment and effectively support the communication needs of mobile groups, such as passengers on trains, buses, and ships. newsletter on . Relay technology is a positive supplement to wireless...

AI Technical Summary

Problems solved by technology

[0006] However, since the service data of the UE within the coverage of the RN is transmitted through the Uu interface between the UE and the RN, the following problems will arise: a large amount of data is transmitted through the wireless channel between the UE and the RN, but there is a lack of corresponding channel estimation , leading to a decline in the transmission performance of the wireless channel between UE and RN; at the same time, the original pure UE-eNB uplink and downlink wireless environment also increases the wireless transmission source due to the introduction of RN, which increases the complexity of the wireless environment

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