A Joint Design of Coherent Transmission and Coherent Receving in 5G-Advanced Networks

Uplink broadband communication is very popular for V2X high date rate sensing data uploading. A joint design of UL coherent transmission and coherent receiving (JCTCR) mechanism is proposed to significantly increase the uplink capability of 5G-Advanced networks. In the transmission side, a physical layer cooperation mechanism is introduced, the data is transmitted as a single transport block over two 2Tx UEs’ physical layer. The tight cooperation in physical layer forms a more powerful 4Tx virtual UE (VUE), which significantly improves the uplink edge user perceived throughput by about 143%. The coherent transmission performance sensitivity to the synchronization error is also evaluated and analyzed in the paper. In the receiving side, a broadly applicable UE assisted non-ideal backhaul multi-BS coherent receiving solution is introduced. In order to enable the coherent joint receiving in non-ideal backhaul scenario, a novel mechanism to make use of the UE OTA signaling assistance is proposed to enable the multi-BS channel information acquisition and multi-BS joint receiving, which makes the JCTCR to be widely applicable for general deployment scenarios and no need for very high quality backhaul assumption in traditional way. Evaluation results show, although the pre resource allocation and the channel information acquisition have singling overhead, the CJTJR still can achieve the uplink capacity gain of 42%, only slight 4% decrease comparing with the ideal coherent receiving with ideal backhaul.