Patent ID: 8520560

Claim:
A method for a User Equipment (UE) to determine a transmission power for an acknowledgement signal, the UE communicating with a base station in a Time Division Duplex (TDD) system and being configured by the base station to have C DownLink (DL) cells and a Transmission Mode (TM) conveying a maximum of two data Transport Blocks (TBs) in a Transmission Time Interval (TTI) in each of C 2 configured DL cells, where C 2 is less than or equal to C, and with a TM conveying one data TB in each of C−C 2 configured DL cells in a TTI, the UE receiving at least one data TB in at least one of the C configured DL cells through at least one of a number N bundle of TTIs, the number N bundle of TTIs being referred to as a bundling window having a size N bundle , the reception of the at least one data TB being scheduled by the base station through transmission of a DL Scheduling Assignment (SA), the DL SA including a DL Assignment Index (DAI) Information Element (IE), the acknowledgment signal being transmitted in response to the reception of the at least one data TB by the UE and conveying acknowledgement information without using spatial-domain bundling, the method comprising: receiving N received data TBs through the configured cells and through the bundling window; determining, from values of the DL DAI IEs in DL SAs detected through the C configured DL cells and through the bundling window, a number N DLSA missed of DL SAs that the base station transmitted to the UE and which the UE failed to detect, N DLSA, 2 missed of the N DLSA missed DL SAs being in DL cells for which the UE is configured to have a TM conveying a maximum of two data TBs; and transmitting the acknowledgement signal with a power derived from the value of N received +N DLSA missed +N DLSA, 2 missed .