Downlink and uplink channel with low latency
Certain aspects of the present disclosure provide techniques that may be used to help enable low latency communications between a user equipment (UE) and a base station (BS) using quick uplink channels that enable a reduced transmission time interval (TTI). Additionally, certain aspects of the present disclosure provide techniques for managing communications in a wireless communication system, for example, by using enhanced downlink control channels.
1. A method for wireless communications by a user equipment (UE), comprising:
receiving, in a downlink subframe comprising two slots, at least one type of advanced physical downlink control channel (aPDCCH) from a base station (BS), wherein
the aPDCCH is transmitted in a control channel region that spans the two slots of the downlink subframe;
the downlink subframe also comprises a data channel region that spans the two slots of the downlink subframe for carrying Machine Type Communication (MTC) data traffic; and
the aPDCCH comprises a quick physical downlink control channel (QPDCCH) having a single-slot transmission time interval (TTI); and
demodulating the aPDCCH based on one or more cell-specific reference signals (CRS).
2. The method of claim 1 , wherein the aPDCCH occupies resources defined for demodulation reference signals (DMRS) in a legacy control channel when transmitting to certain types of UEs.
3. An apparatus for wireless communications by a user equipment (UE), comprising:
a memory coupled with at least one processor, wherein the at least one processor is configured to:
receive, in a downlink subframe comprising two slots, at least one type of advanced physical downlink control channel (aPDCCH) from a base station (BS), wherein
the aPDCCH is transmitted in a control channel region that spans the two slots of the downlink subframe;
the downlink subframe also comprises a data channel region that spans the two slots of the downlink subframe for carrying Machine Type Communication (MTC) data traffic; and
the aPDCCH comprises a quick physical downlink control channel (QPDCCH) having a single-slot transmission time interval (TTI); and
demodulate the aPDCCH based on one or more cell-specific reference signals (CRS).
4. The apparatus of claim 3 , wherein the aPDCCH occupies resources defined for demodulation reference signals (DMRS) in a legacy control channel when transmitting to certain types of UEs.
5. A non-transitory computer-readable medium for wireless communications by a user equipment (UE), comprising:
instructions that, when executed by at least one processor, configure the at least one processor to:
receive, in a downlink subframe comprising two slots, at least one type of advanced physical downlink control channel (aPDCCH) from a base station (BS), wherein
the aPDCCH is transmitted in a control channel region that spans the two slots of the downlink subframe;
the downlink subframe also comprises a data channel region that spans the two slots of the downlink subframe for carrying Machine Type Communication (MTC) data traffic; and
the aPDCCH comprises a quick physical downlink control channel (QPDCCH) having a single-slot transmission time interval (TTI); and
demodulate the aPDCCH based on one or more cell-specific reference signals (CRS).
6. The non-transitory computer-readable medium of claim 5 , wherein the aPDCCH occupies resources defined for demodulation reference signals (DMRS) in a legacy control channel when transmitting to certain types of UEs.