Retransmission control technique

摘要

A retransmission control method, a transmitter and a receiver. The method comprises the steps of receiving, at a MIMO transmitter, a NACK signal indicating an unsuccessful decoding of a coded data packet at a MIMO receiver; receiving a reliability measure associated with one or more transmitted spatial data streams for the unsuccessfully decoded data packet; comparing the reliability measure with at least one predetermined threshold; and selecting a retransmission protocol based on the comparison of the reliability measure with the at least one predetermined threshold.

主权项

1. A retransmission control method comprising:
receiving, at a MIMO transmitter, a NACK signal indicating an unsuccessful decoding of a coded data packet at a MIMO receiver; receiving a reliability measure associated with one or more transmitted spatial data streams for the unsuccessfully decoded data packet; comparing the reliability measure with at least one predetermined threshold; and selecting a retransmission protocol based on the comparison of the reliability measure with the at least one predetermined threshold, the retransmission protocol comprising a Chase combining protocol or an Incremental Redundancy protocol, wherein the reliability measure comprises a system bits component and a parity bits component, the system bits component including one or more system bits reliability data indicative of the reliability of the system bits of said one or more transmitted spatial data streams, respectively, system bits reliability data associated with each data stream for the unsuccessfully decoded data packet in a Single Code Word (SCW) MIMO transmission, and the parity bits component comprises parity bits reliability data of the unsuccessfully decoded data packet, wherein the reliability measure is determined based on the one or more transmitted spatial data streams received at the MIMO receiver, and wherein the selecting of the retransmission protocol comprises:
selecting the Incremental Redundancy protocol for a retransmission data packet if the system bits reliability data is higher than a system bit threshold;selecting the Chase combining protocol for the retransmission packet if the system bits reliability data is lower than or equal to the system bit threshold;selecting a lowered coding rate, as compared to an original transmission, for the retransmission data packet using the Chase combining protocol if the parity bits reliability data is lower than or equal to a parity bits threshold; orselecting a same coding rate, as compared to the original transmission, for the retransmission data packet using the Chase combining protocol if the parity bits reliability data is higher than the parity bits threshold.