Patent ID: 8289935

Claim:
A method comprising: receiving an uplink resource allocation that grants an overlapping uplink resource to a plurality of user equipments, and an indication in the granted uplink resource allocation of a first cyclic shift specific to a first user equipment of the plurality of user equipments; sending data on the granted uplink resource; mapping the granted uplink resource to a downlink resource in dependence on the indicated first cyclic shift, wherein the mapping is such that for a predetermined number of user equipments comprising said first user equipment and being allocated the overlapping uplink resource in a single multi-user multiple input multiple output uplink resource allocation, user equipment-specific cyclic shifts which map to adjacent downlink resources are non-adjacent user equipment-specific cyclic shifts relative to one another; and tuning a receiver to receive on the mapped downlink resource an indication about the sent data, wherein the first cyclic shift is for a demodulation reference signal and the indication of the first cyclic shift is a dynamic cyclic shift indicator that indicates a relative cyclic shift in a cell in which the plurality of user equipments operate.