Patent ID: 9571248
Date: 2017-02-14
CPC Classifications: H04L,H04W

Claim:
1. A method for configuring a reference signal (RS) in a wireless communication system supporting multiple carriers, the method being performed by a wireless device and comprising: determining, by a processor of the wireless device, whether to configure a new RS, wherein the new RS is determined to be configured if one or more legacy RSs are absent in one or more downlink subframes received by a radio frequency receiver of the wireless device; configuring, by the processor, the new RS within the one or more received downlink subframes; determining, by the processor, a candidate location of the new RS within the one or more configured downlink subframes by considering at least one of a time/frequency density of the new RS, a time/frequency tracking of the new RS, a cell identification of the new RS, a presence of a primary synchronization signal (PSS)/secondary synchronization signal (SSS) and a measurement using the new RS; and changing, by the processor, the candidate location of the new RS by shifting orthogonal frequency divisional multiplexing (OFDM) symbols or sub-carriers such that the candidate location of the new RS does not collide with the one or more legacy RSs within the one or more configured downlink subframes.