Methods using HARQ-ACK codebooks for multi-flow communications and related wireless terminals and radio network nodes

摘要

At least one transport data block is transmitted from a first sector of a network over a downlink to a wireless terminal during a time resource element for a multi-flow downlink transmission to the wireless terminal, and at least one transport data block is transmitted from a second sector of the network over a downlink to the wireless terminal during the time resource element for the multi-flow downlink transmission. A feedback message is received for the time resource element from the wireless terminal, wherein the feedback message includes a HARQ-ACK codeword selected from a HARQ-ACK codebook providing HARQ-ACK feedback for the at least one transport data block transmitted from the first sector and for the at least one transport data block transmitted from the second sector. The HARQ-ACK codeword is interpreted for the at least one transport data block transmitted from the first sector based on the first sector being a primary sector for the multi-flow downlink transmission.

主权项

1. A method of communicating in a wireless communication network including a plurality of base stations supporting multi-flow downlink transmissions, the method comprising:
transmitting at least one transport data block from a first sector of the network over a downlink to a wireless terminal during a time resource element for a multi-flow downlink transmission to the wireless terminal, wherein the first sector is a primary sector for the multi-flow downlink transmission to the wireless terminal; transmitting at least one transport data block from a second sector of the network over a downlink to the wireless terminal during the time resource element for the multi-flow downlink transmission, wherein the second sector is a secondary sector for the multi-flow downlink transmission to the wireless terminal; receiving a feedback message for the time resource element from the wireless terminal, wherein the feedback message includes a Hybrid Automatic Repeat Request Acknowledge (HARQ-ACK) codeword selected from a HARQ-ACK codebook providing HARQ-ACK feedback for the at least one transport data block transmitted from the first sector and for the at least one transport data block transmitted from the second sector, wherein the HARQ-ACK codeword has a first interpretation for the primary sector when a single transport data block is transmitted from the primary sector and a second interpretation when two transport data blocks are transmitted from the primary sector; interpreting the HARQ-ACK codeword for the at least one transport data block transmitted from the first sector based on the first sector being a primary sector for the multi-flow downlink transmission and based on a number of the at least one transport data block transmitted from the first sector over the downlink to the wireless terminal during the time resource element; and determining whether to retransmit one or more of the at least one transport data block transmitted from the first sector responsive to interpreting the HARQ-ACK codeword; wherein the HARQ-ACK codebook includes HARQ-ACK codewords for a multi-flow downlink transmission including a single transport data block from each of the primary and secondary sectors during a time resource element, HARQ-ACK codewords for a multi-flow downlink transmission including a single transport data block from the primary sector and two transport data blocks from the secondary sector during a time resource element, HARQ-ACK codewords for a multi-flow downlink transmission including two transport data blocks from the primary sector and a single transport data block from the secondary sector during a time resource element, and HARQ-ACK codewords for a multi-flow downlink transmission including two transport data blocks from each of the primary and secondary sectors during a time resource element, and wherein a minimum Hamming distance of HARQ-ACK codewords within the HARQ-ACK codebook is four.