Downlink feedback method for time division dual system and relay link thereof

摘要

The present invention discloses a Time Division Dual (TDD) system and a downlink feedback method for a relay link thereof. A relay station and a network side of the TDD system transmit uplink data and downlink feedback through relay subframes, wherein: one or more uplink subframes are selected from uplink subframes of a wireless frame as uplink relay subframes used for uplink data transmission, a downlink subframe is determined for each uplink relay subframe from downlink subframes of the wireless frame as a downlink relay subframe used for downlink feedback or new data indication, wherein the uplink relay subframes and the downlink relay subframes have a fixed timing sequence relationship; the relay station transmits uplink data to the network side through the uplink relay subframes, and receives the downlink feedback or new data indication from the network side through the downlink relay subframes corresponding to the uplink relay subframes.

主权项

1. A downlink feedback method for a relay link in a Time Division Dual (TDD) system, comprising:
selecting one or more uplink subframes from uplink subframes of a wireless frame as uplink relay subframes used for uplink data transmission, determining a downlink subframe for each uplink relay subframe from downlink subframes of the wireless frame as a downlink relay subframe used for downlink feedback or new data indication, wherein the uplink relay subframe and the downlink relay subframe have a fixed timing sequence relationship; a relay station transmitting uplink data to a network side through an uplink relay subframe, and receiving downlink feedback or new data indication from the network side through a downlink relay subframe corresponding to the uplink relay subframe according to the fixed timing sequence relationship, wherein, the uplink relay subframe and the downlink relay subframe having a fixed timing sequence relationship means that there is a fixed subframe interval k between the uplink relay subframe and the downlink relay subframe, the downlink relay subframe is a kth subframe after the uplink relay subframe; and wherein, when the wireless frame adopts an uplink and downlink configuration 1: if only an uplink subframe #8 is selected as the uplink relay subframe for uplink data transmission, the downlink relay subframe is a downlink subframe #4, or downlink subframes #4 and #9; wherein: the downlink subframe #4 is taken as the downlink relay subframe having the fixed timing sequence relationship with the uplink subframe #8, wherein the timing sequence interval k=6; if only an uplink subframe #3 is selected as the uplink relay subframe for uplink data transmission, the downlink relay subframe is the downlink subframe #9, or the downlink subframes #4 and #9; wherein: the downlink subframe #9 is taken as the downlink relay subframe having the fixed timing sequence relationship with the uplink subframe #3, wherein the timing sequence interval k=6; if the uplink subframes #3 and #8 are selected as the uplink relay subframes for uplink data transmission, the downlink relay subframes are the downlink subframes #4 and #9; wherein, the downlink subframe #4 is taken as the downlink relay subframe having the fixed timing sequence relationship with the uplink subframe #8, and the downlink subframe #9 is taken as the downlink relay subframe having the fixed timing sequence relationship with the uplink subframe #3, wherein the timing sequence interval k=6.