Apple Inc.
Control Data for Code Block Group-Based Retransmission

Abstract:

Techniques are disclosed relating to control data for retransmissions in wireless communications. In various embodiments, a UE sends acknowledgements (e.g., HARQ acknowledgements) at code block group (CBG) granularity. CBGs may be included in codewords that may be transmitted using multiple MIMO layers. In some embodiments, the network is configured to send a new data indicator for each CBG. In some embodiments, the network is configured to use a different number of layers for a retransmission of a CBG than for the original transmission. Thus, the layer-to-CBG or layer-to-codeword mapping may be specified dynamically. In various embodiments, the disclosed techniques may improve overall network bandwidth relative to traditional retransmission techniques.