METHOD AND APPARATUS FOR COMMUNICATION IN LTE SYSTEM ON UNLICENSED SPECTRUM
Provided herein are method and apparatus for communication in LTE system on unlicensed spectrum. An apparatus for a user equipment (UE) may include: circuitry configured to: detect a presence detection reference signal for a channel having a dwell period on an unlicensed spectrum; and determine a location of a starting subframe for a physical downlink control channel (PDCCH) in the dwell period based on detection of the presence detection reference signal; and a memory to store the location of the starting subframe. In some embodiments of the present disclosure, the dwell period is fixed. In some embodiments, the dwell period comprises a fixed downlink dwell period and a fixed uplink dwell period.
1 .- 25 . (canceled)
26 . An apparatus for a user equipment (UE), comprising:
circuitry to:
detect a presence detection reference signal for a channel having a dwell period on an unlicensed spectrum; and
determine a location of a starting subframe for a physical downlink control channel (PDCCH) in the dwell period based on detection of the presence detection reference signal; and
a memory to store the location of the starting subframe.
27 . The apparatus of claim 26 , wherein the location of the starting subframe for the PDCCH is floating.
28 . The apparatus of claim 26 , wherein the location of the starting subframe for the PDCCH is N subframes after the presence detection reference signal, wherein N is a positive integer.
29 . The apparatus of claim 26 , wherein the circuitry is to:
decode the PDCCH and one or more repetitions of the PDCCH, wherein the PDCCH is received at the location and the one or more repetitions of the PDCCH are received M subframes after the PDCCH, wherein M is a positive integer.
30 . The apparatus of claim 29 , wherein the circuitry is to:
drop repetitions of the PDCCH that are in another channel.
31 . The apparatus of claim 26 , wherein a starting Orthogonal Frequency Division Multiplexing (OFDM) symbol for the PDCCH is the first OFDM symbol within the starting subframe.
32 . The apparatus of claim 26 , wherein the circuitry is to:
disable frequency hopping for the PDCCH within the channel.
33 . The apparatus of claim 29 , wherein the circuitry is to:
decode a physical downlink share channel (PDSCH) associated with the PDCCH, wherein the PDSCH is received in a subframe immediately following an ending subframe of a last one of the one or more repetition of the PDCCH.
34 . The apparatus of claim 33 , wherein the circuitry is to:
disable frequency hopping for the PDSCH within the channel.
35 . The apparatus of claim 33 , wherein the circuitry is to:
decode one or more repetitions of the PDSCH, wherein the one or more repetitions of the PDSCH is received in the channel.
36 . The apparatus of claim 35 , wherein the number of the one or more repetitions of the PDSCH is configured by an access node.
37 . The apparatus of claim 36 , wherein the one or more repetitions of the PDSCH are received in contiguous subframes or non-contiguous subframes.
38 . The apparatus of claim 35 , wherein the circuitry is to:
drop repetitions of the PDSCH that are in another channel.
39 . An apparatus for an access node, comprising:
circuitry to:
perform listen before talk (LBT) procedure for a channel having a dwell period on an unlicensed spectrum to detect whether the channel is available;
generate a presence detection reference signal, for transmission when the channel is detected to be available; and
configure a location of a starting subframe for a physical downlink control channel (PDCCH) in the dwell period based on the transmission of the presence detection reference signal; and
a memory to store the location of the starting subframe.
40 . The apparatus of claim 39 , wherein the circuitry is to:
configure a location of a starting subframe for a physical uplink share channel (PUSCH) associated with the PDCCH, for transmission by a user equipment (UE) W subframes after reception of the PDCCH, wherein W is a positive integer.
41 . The apparatus of claim 40 , wherein the circuitry is to:
configure the W via downlink channel information (DCI).
42 . The apparatus of claim 40 , wherein the circuitry is to:
disable frequency hopping for the PUSCH within the channel.
43 . The apparatus of claim 40 , wherein the circuitry is to:
configure location of subframes for one or more repetitions of the PUSCH, for transmission in non-contiguous subframes by the UE.
44 . The apparatus of claim 40 , wherein the circuitry is to:
configure location of subframes for one or more repetitions of the PUSCH, for transmission in another channel by the UE.
45 . The apparatus of claim 39 , wherein the dwell period is fixed.
46 . The apparatus of claim 45 , wherein the dwell period comprises a fixed downlink dwell period and a fixed uplink dwell period.
47 . The apparatus of claim 40 , wherein the circuitry is to:
decode the PUSCH that is transmitted in unit of a predefined number of contiguous subframes.
48 . The apparatus of claim 47 , wherein the predefined number is 5.
49 . The apparatus of claim 39 , wherein the circuitry is to:
perform channel switching from the channel to another channel at a first subframe temporally of dwell period of the another channel.
50 . The apparatus of claim 49 , wherein the circuitry is to:
perform the channel switching at first two Orthogonal Frequency Division Multiplexing (OFDM) symbols temporally of the first subframe.