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1. (WO2018200194) OVER-THE-AIR PHASE SYNCHRONIZATION FOR RECIPROCITY-BASED COMP JOINT TRANSMISSION

Pub. No.:    WO/2018/200194    International Application No.:    PCT/US2018/026922
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Wed Apr 11 01:59:59 CEST 2018
IPC: H04L 27/26
H04W 56/00
H04B 7/06
Applicants: QUALCOMM INCORPORATED
Inventors: FAN, Zhifei
YOO, Taesang
ZHANG, Xiaoxia
FAKOORIAN, Seyed Ali Akbar
Title: OVER-THE-AIR PHASE SYNCHRONIZATION FOR RECIPROCITY-BASED COMP JOINT TRANSMISSION
Abstract:
Over-the-air phase synchronization for reciprocity-based coordinated multipoint (CoMP) joint transmission is discussed. The base stations of the CoMP group and served user equipment (UEs) each transmit phase synchronization reference signals (PSRS). The receiving nodes will compute co-phasing values representing the phase difference between pairs of the PSRS. For example, the difference between two downlink PSRS computed at the UE for a downlink co-phasing value, and the difference between a single PSRS received at two base stations computed at the base station for an uplink co-phasing value. The base stations of the CoMP group may determine a phase compensation by computing the differences between the uplink and downlink co-phasing values and use that phase compensation to adjust communications by the base stations in the CoMP group. In other aspects, the computed co-phasing values may be used to modulate each nodes transmission of its respective PSRS.