QUALCOMM Incorporated
SELECTIVE BUNDLING TECHNIQUES FOR HARQ-ACK FEEDBACK

Abstract:

Apparatus, methods, and computer-readable media for managing HARQ-ACK processes in wireless user equipment (UEs) allow selective compression of HARQ-ACK information within HARQ-ACK codebooks. A wireless base station may transmit control information including scheduling information for K downlink transport blocks for a UE, and may signal bundling rules for selectively compressing an original HARQ-ACK codebook of size K into a constrained HARQ-ACK codebook of size N<K. Bundling rules can include the maximum codebook size N, a number M of bits that should not be bundled, criteria for bundling a plurality of the K-M bits into N-M bits, etc. The UE can apply a logical AND operation to ACK/NACK bits to produce one or more representative bundled bits. The base station identifies and schedules retransmission of packets associated with all of a bundled set of A/N bits if their representative bundled bit is NACK.