Methods of receiving retransmissions including discontinuous transmission indicators in MIMO systems

摘要

A wireless terminal may receive downlink signaling over a downlink signaling channel from a base station, with the downlink signaling including a DTX indicator for a first downlink MIMO layer and a retransmission data indicator for a second downlink MIMO layer. Soft bits for the second MIMO layer may be generated for a TTI corresponding to the downlink signaling, and the soft bits may be decoded. After decoding the soft bits, an ACK message for the second MIMO layer may be transmitted responsive to success decoding the soft bits or a NACK message for the second MIMO layer may be transmitted responsive to failure decoding the soft bits, and a default response may be transmitted for the first MIMO layer for the TTI.

主权项

1. A method of operating a wireless terminal, the method comprising:
receiving downlink signaling for a transmission time interval (TTI) over a downlink signaling channel from a base station, wherein the downlink signaling includes a discontinuous transmission (DTX) indicator indicating discontinuous transmission over a first downlink multiple-input-multiple-output (MIMO) layer of the TTI and a retransmission data indicator indicating retransmission over a second downlink MIMO layer of the TTI; generating soft bits for the second downlink MIMO layer of the TTI corresponding to the downlink signaling; decoding the soft bits for the second downlink MIMO layer of the TTI; after decoding the soft bits for the second downlink MIMO layer of the TTI, transmitting an acknowledgment (ACK) message corresponding to the second downlink MIMO layer of the TTI responsive to success decoding the soft bits for the second downlink MIMO layer of the TTI or transmitting a negative acknowledgment (NACK) message corresponding to the second downlink MIMO layer of the TTI responsive to failure decoding the soft bits for the second downlink MIMO layer of the TTI; and transmitting a default response corresponding to the first downlink MIMO layer of the TTI responsive to receiving the DTX indicator indicating discontinuous transmission over the first downlink MIMO layer of the TTI.