A method of communicating in a wireless communication network including a plurality of base stations supporting multi-flow downlink transmissions, the method comprising: transmitting (707, 709) a single or two transport data block(s) from a first sector (A, A') 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 (A, A') is a serving sector for the multi-flow downlink transmission to the wireless terminal; transmitting (707, 709) a single or two transport data block(s) from a second sector (B, B") 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 (B, B") is an assisting sector for the multi-flow downlink transmission to the wireless terminal; wherein the method is characterized by further comprising: 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 having different interpretations providing HARQ-ACK feedback for the transport data block(s) transmitted from the first sector (A, A') and for the transport data block(s) transmitted from the second sector (B, B"), wherein the HARQ-ACK codeword has a first interpretation for the serving sector when a single transport data block is transmitted from the serving sector and a second interpretation when two transport data blocks are transmitted from the serving sector; interpreting the HARQ-ACK codeword for the transport data block(s) transmitted from the first sector (A, A') based on the first sector being a serving sector for the multi-flow downlink transmission and based on a number of the transport data block(s) transmitted from the first sector (A, A') over the downlink to the wireless terminal during the time resource element; and determining whether to retransmit one or more of the transport data block(s) transmitted from the first sector (A, A') responsive to interpreting the HARQ-ACK codeword. transmitting (707, 709) a single or two transport data block(s) from a first sector (A, A') 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 (A, A') is a serving sector for the multi-flow downlink transmission to the wireless terminal; transmitting (707, 709) a single or two transport data block(s) from a second sector (B, B") 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 (B, B") is an assisting sector for the multi-flow downlink transmission to the wireless terminal; wherein the method is characterized by further comprising: 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 having different interpretations providing HARQ-ACK feedback for the transport data block(s) transmitted from the first sector (A, A') and for the transport data block(s) transmitted from the second sector (B, B"), wherein the HARQ-ACK codeword has a first interpretation for the serving sector when a single transport data block is transmitted from the serving sector and a second interpretation when two transport data blocks are transmitted from the serving sector; interpreting the HARQ-ACK codeword for the transport data block(s) transmitted from the first sector (A, A') based on the first sector being a serving sector for the multi-flow downlink transmission and based on a number of the transport data block(s) transmitted from the first sector (A, A') over the downlink to the wireless terminal during the time resource element; and determining whether to retransmit one or more of the transport data block(s) transmitted from the first sector (A, A') responsive to interpreting the HARQ-ACK codeword. 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 having different interpretations providing HARQ-ACK feedback for the transport data block(s) transmitted from the first sector (A, A') and for the transport data block(s) transmitted from the second sector (B, B"), wherein the HARQ-ACK codeword has a first interpretation for the serving sector when a single transport data block is transmitted from the serving sector and a second interpretation when two transport data blocks are transmitted from the serving sector; interpreting the HARQ-ACK codeword for the transport data block(s) transmitted from the first sector (A, A') based on the first sector being a serving sector for the multi-flow downlink transmission and based on a number of the transport data block(s) transmitted from the first sector (A, A') over the downlink to the wireless terminal during the time resource element; and determining whether to retransmit one or more of the transport data block(s) transmitted from the first sector (A, A') responsive to interpreting the HARQ-ACK codeword.