Patent ID: 9118471
Filing Date: 2015-08-25
Classification: H04L,H04W

Abstract:
1. A method in a terminal for providing an acknowledgement/not-acknowledgement (ACK/NAK) message to a base station, the base station and the terminal in a telecommunication system, the method comprising: receiving downlink subframes from the base station; counting a number of downlink assignments detected in received downlink subframes to k; establishing whether each of a number of transport blocks in the downlink subframes in which a downlink assignment is detected is correctly received or not; when each of the transport blocks in the downlink subframes in which a downlink assignment is detected is estimated as correctly received, providing to the base station an encoded ACK message for the k downlink assignments, which encoded ACK message comprises k, the number of number of detected downlink assignments; obtaining in each subframe a downlink assignment index (DAI) from the base station, the DAI representing a number of previous downlink assignments; establishing if any downlink assignment transmitted by the base station has been missed in any downlink subframe in which a downlink assignment has been detected, and comparing the number of received downlink assignments with the DAI to determine if any previous downlink assignment has been missed; when a downlink assignment transmitted by the base station has been established to have been missed, providing to the base station one encoded NAK message that is modulated into a constellation point different from a constellation point into which the encoded ACK message would have been modulated; and when any transport block in the k downlink subframes is estimated as not correctly received, providing to the base station one encoded NAK message for the k downlink assignments bundled,