Patent ID: 9031052
Filing Date: 2015-05-12
Classification: H04L,H04W

Abstract:
1. A method of generating an uplink reference signal by a user equipment (UE) in a system supporting a plurality of uplink access schemes, the method comprising: transmitting information on a preferred uplink access scheme to a base station; receiving, from the base station, reference signal configuration information indicating a configuration of a reference signal to be transmitted to the base station, wherein the reference signal configuration information is generated for each of the plurality of uplink access schemes; and transmitting a subframe including the reference signal generated based on the reference signal configuration information to the base station, wherein the reference signal configuration information includes at least one cyclic shift value of a sequence of the reference signal, wherein the plurality of uplink access schemes consist of an essential uplink access scheme and one of selectable uplink access schemes, wherein symbols of the reference signal in the subframe are varied according to the plurality of uplink access schemes, wherein the selectable uplink access schemes include a scheme for transmitting an uplink signal using clustered Single Carrier-Frequency Division Multiple Access (SC-FDMA) and a scheme for transmitting an uplink signal using segmented SC-FDMA, wherein the reference signal configuration information for the selectable uplink access schemes includes a plurality of different cyclic shift values of the sequence of the reference signal corresponding to a plurality of non-contiguous resource blocks, wherein the reference signal configuration information is received through an uplink grant channel, wherein the uplink grant includes information indicating one of the plurality of selectable uplink access schemes, and wherein the one selectable uplink access scheme is determined based on the information on the preferred uplink access scheme.