Patent ID: 8644199

Claim:
A method for a User Equipment (UE) to determine a resource for an acknowledgement signal transmission using a Downlink Assignment Index (DAI) Information Element (IE) included in each DownLink (DL) Scheduling Assignment (SA) for indicating a DL SA number and a Transmission Power Control (TPC) IE included in each DL SA for adjusting an acknowledgement signal transmission power, in a communication system wherein the UE receives multiple DL SAs transmitted from a base station, each of the DL SAs being associated with a respective DL Component Carrier (CC), and wherein the UE transmits in an UpLink (UL) CC an acknowledgement signal in response to a reception of the DL SAs, the method comprising the steps of: determining a power adjustment for the acknowledgement signal transmission from a TPC IE value in a first DL SA associated with a first DL CC, the first DL SA having a DAI IE value equal to one; and determining the resource for the acknowledgement signal transmission from a TPC IE value in a second DL SA associated with the first DL CC, the second DL SA having a DAI IE value larger than one, and from another TPC IE value in each DL SA associated with a DL CC other than the first DL CC.