Patent ID: 8094638

Claim:
A method for defining transmission parameters of user equipment (UE) reference signals (RS), comprising: estimating channel delay spreads of a plurality of UEs scheduled for transmission at a particular transmission time period or sub-frame in an uplink for communication with a NodeB; allocating transmission parameters to each scheduled UE of the plurality of UEs in accordance to the delay spreads of the plurality of UEs scheduled for transmission in the particular time period or sub-frame, wherein the parameters comprises a cyclic shift allocated to each m-th UE equal to the sum of a delay spread and a uncertainty of each of the previous m-1 UEs; and wherein the NodeB allocates cyclic shifts to the plurality of scheduled UEs, the allocating comprising: selecting a first UE of the plurality of UEs and allocating to it a cyclic shift of zero; and individually selecting each of the remaining UEs of the plurality of UEs and allocating a cyclic shift to an m-th UE based on a sum of cyclic shifts allocated to previous m-1 UEs of the plurality of UEs scheduled for uplink transmission during the same transmission time interval or sub-frame, where m=[1, total number of UEs scheduled for uplink transmission].