METHOD FOR FEEDING BACK DIFFERENT UPLINK-DOWNLINK CONFIGURATION RATIOS FOR LTE-A TDD

摘要

Provided is a method for feeding back different uplink-downlink configuration ratios for LTE-A TDD. For an asymmetric uplink and downlink sub-frame in a carrier aggregation scenario, the uplink sub-frame of each component carrier only feeds back Ack/Nack of the downlink sub-frame PDSCH of the current carrier, not feeding back Ack/Nack of other carriers. Also proposed is another method for feeding back different uplink-downlink configuration ratios for LTE-A TDD. For an asymmetric uplink and downlink sub-frame in a carrier aggregation scenario, Ack/Nack of the downlink sub-frame of each component carrier is fed back by the uplink sub-frame of the closest auxiliary cell with the minimum auxiliary cell index value after at least four sub-frames, allowing Ack/Nack of a plurality of carriers to be transmitted on other carriers. The present invention takes advantage of the asymmetry characteristic of uplink sub-frames of different sub-frame configuration ratios, which can reduce the maximum value of Ack/Nack of the downlink sub-frame PDSCH fed back in the uplink sub-frame, decreasing the time delay in feeding back Ack/Nack of the downlink sub-frame to the eNB.

主权项

1. A feedback method for different uplink-downlink configurations for LTE-A TDD, comprising:
configuring different bands in time division duplex (TDD) with different uplink-downlink configurations, wherein for asymmetric uplink and downlink subframes in a carrier aggregation scenario, an uplink subframe of each component carrier is used to feed back a feedback message Ack/Nack of a physical downlink shared channel (PDSCH) of a downlink subframe of the component carrier itself, but is not used to feed back the Ack/Nack message of other carrier.