Patent ID: 8693420

Claim:
A method for communications controller operations, the method comprising: signaling information related to a set of sequence groups to a first communications device, wherein the first communications device uses a sequence in the set of sequence groups to modulate a reference signal; selecting a sequence group from the set of sequence groups; and signaling information related to the selected sequence group to the first communications device, wherein the information related to the selected sequence group comprises an m bit long bit sequence, where m is an integer value, wherein the set of sequence groups comprises n sequence groups, where n is an integer, wherein a k-th subset of states of the bit sequence is mapped to sequences in a k-th sequence group, where k is an integer value and ranges from 1 to n, and wherein a p-th sequence group comprises a cell identifier specific sequence group, and wherein a p-th subset of states of the bit sequence is mapped to sequences in the cell identifier specific sequence group and is further mapped to ACK/NACK offsets for a downlink ACK/NACK channel, where a corresponding relationship between sequences in the cell identifier specific sequence group and the ACK/NACK offsets is the same as a relationship for legacy communications devices, and p is a predefined integer value.