DL scheduling and HARQ-ACK feedback for DL transmissions in flexible-TDD systems without and with cross-subframe scheduling
AssigneeNEC Corporation
InventorsPhong Nguyen, Yuanrong Lan
Life of this patent
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Abstract
There is provided methods for use in control signaling in advanced wireless communication systems that support flexible allocation of TDD UL-DL configurations. Where HARQ-ACK bundling is used, PDCCH/EPDCCH transmissions indicating DL SPS release and PDSCH transmissions with corresponding PDCCH/EPDCCH are scheduled only on DL and/or special subframes in a DL association set which are not after the subframe in the DL association set carrying an UL grant. Where HARQ-ACK multiplexing is used, the value of the DL assignment index (VDAIUL) is set to the number of subframes in the DL association set. Cross-subframe scheduling is also used.
Claims22
A signaling method for use in a wireless communication system that supports flexible allocation of time division duplex (TDD) uplink-downlink (UL-DL) configurations and in which hybrid automatic repeat request acknowledgement (HARQ-ACK) bundling is used, the method comprising:
- allocating one of a plurality of TDD UL-DL configurations for use on a given radio frame, wherein for a given TDD UL-DL configuration:
- an UL subframe carries HARQ-ACK feedback for one or more DL and/or special subframes in the given radio frame and/or a previous radio frame,
- a DL association set comprises the one or more DL and/or special subframes for which HARQ-ACK feedback is carried in the said UL subframe;
- and
- an UL grant for the said UL subframe is sent on one of the DL and/or special subframes in the DL association set;
- and
- the method also comprising scheduling
- (enhanced) physical downlink control channel (PDCCH/EPDCCH) transmissions indicating DL semi-persistent scheduling (SPS) release and/or
- physical downlink shared channel (PDSCH) transmissions with corresponding PDCCH/EPDCCH
- only on DL and/or special subframes in the DL association set which are not after the subframe carrying the UL grant.
A signaling method for use in a wireless communication system that supports flexible allocation, by a base station (eNB), of TDD UL-DL configurations for use in signaling between the eNB and an advanced UE, and wherein HARQ-ACK multiplexing is used, the method comprising:
- allocating one of a plurality of TDD UL-DL configurations for use on a given radio frame, wherein for a given TDD UL-DL configuration:
- an UL subframe carries HARQ-ACK feedback for a plurality of DL and/or special subframes in the given radio frame and/or a previous radio frame,
- a DL association set comprises the plurality of DL and/or special subframes for which HARQ-ACK feedback is carried in the said UL subframe;
- and
- an UL grant for the said UL subframe is sent on one of the DL and/or special subframes in the DL association set;
- and
- the method also comprises:
- setting the value of a DL assignment index (VDAIUL) to the number of subframes in the DL association set;
- and
- transmitting VDAIUL from the eNB to the advanced UE in the UL grant, where VDAIUL indicates the total number of expected subframes with PDCCH/EPDCCH(s) associated with PDSCH transmission(s) and PDCCH/EPDCCH transmission(s) indicating DL SPS release in the DL association set.
A signaling method for use in a wireless communication system that supports flexible allocation of TDD UL-DL configurations, the method comprising:
- cross-subframe scheduling wherein, for a PDSCH transmission on a particular subframe, the corresponding PDCCH/EPDCCH associated with that PDSCH transmission is sent in a different subframe;
- allocating one of a plurality of TDD UL-DL configurations for use on a given radio frame, wherein for a given TDD UL-DL configuration:
- an UL subframe carries HARQ-ACK feedback for one or more DL and/or special subframes in the given radio frame and/or a previous radio frame,
- a DL association set comprises the one or more DL and/or special subframes for which HARQ-ACK feedback is carried in the said UL subframe;
- and
- an UL grant for the said UL subframe is sent on one of the DL and/or special subframes in the DL association set.
Dependencies are inferred from the claim text.