Patent ID: 9185669
Filing Date: 2015-11-10
Classification: H04W

Abstract:
1. A method for downlink synchronization by a base station having a distributed antenna system that includes base station antennas that are distributed at various positions within a cell, the method comprising: determining, by the base station, a transmission offset based on a transmission point of the distributed antenna system from which a downlink synchronization signal is to be transmitted by the base station, the transmission offset being a time and frequency offset that is determined based on antenna port 0 of a macro evolved-NodeB (eNB), the transmission point being selected from the group consisting of the macro eNB and at least two RRHs (Remote Radio Heads) of the distributed antenna system, the transmission offset for individual RRHs of the at least two RRHs being different from each other so as to avoid interference between the at least two RRHs; allocating, by the base station, the downlink synchronization signal to a Physical Broadcasting Channel (PBCH) of the distributed antenna system based on the determined transmission offset; and transmitting, by the base station via the PBCH of the distributed antenna system, the downlink synchronization signal to a user equipment.