Patent ID: 8565181
Filing Date: 2013-10-22
Classification: H04B,H04L

Abstract:
1. A signal transmission method for a mobile station in a communication system comprising a plurality of base stations operating in a plurality of cells, the method comprising: transmitting a first uplink signal to a base station on a first set of subcarriers in a first Orthogonal Frequency Division Multiplexing (OFDM) symbol, wherein the first set of subcarriers are modulated with a first signal sequence, the first signal sequence known to both the mobile station and the base station; and transmitting a second uplink signal to the base station on a second set of subcarriers in a second OFDM symbol, wherein the second set of subcarriers are modulated with the first signal sequence or a transform of the first signal sequence and further modulated with a second signal sequence, the second signal sequence containing attribute information on a third set of subcarriers of a downlink signal received by the mobile station over a downlink channel, wherein the correspondence between the subcarriers in the third set and the subcarriers in the second set are known to both the mobile station and the base station.