Resource allocation in unlicensed bandwidth part
Allocating resources to user devices in a base station includes transmitting, to a user device, indications of a first time-frequency resource including a first frequency sub-band within a bandwidth part allocated in an unlicensed spectrum and a second time-frequency resource including a second frequency sub-band within the bandwidth part, performing a channel access procedure on the first channel corresponding to the first frequency sub-band, and a second channel corresponding to the second frequency sub-band, to obtain channel occupancy time on at least one of the first channel or the second channel; and transmitting, within the obtained channel occupancy time on at least one of the first channel or the second channel, downlink control information to a user device over a first time-frequency resource that includes the first frequency sub-band or a second time-frequency resource that includes the second frequency sub-band.
1. A method in a base station for allocating resources to user devices, the method comprising:
transmitting, to a user device, indications of (i) a first time-frequency resource including a first frequency sub-band within a bandwidth part (BWP) allocated in an unlicensed spectrum and (ii) a second time-frequency resource including a second frequency sub-band within the BWP;
performing a channel access procedure on (i) a first channel corresponding to the first frequency sub-band, and (ii) a second channel corresponding to the second frequency sub-band, to obtain channel occupancy time on the first channel and the second channel;
transmitting, within the obtained channel occupancy time on the first channel, a first downlink control information (DCI) to the user device over a first time-frequency resource that includes the first frequency sub-band; and
transmitting within the obtained channel occupancy time on the second channel, a second DCI to the user device over a second time-frequency resource that includes the second frequency sub-band.
2. The method of claim 1 , wherein the configuration further specifies a respective offset within a time slot for each of the first time-frequency resource and the second time-frequency resource.
3. The method of claim 1 , including:
transmitting the indications in one of (i) a Radio Resource Control (RRC) message for setting up a new radio connection, (ii) an RRC message for reconfiguring a previously set up radio connection, or (iii) an RRC message for resuming a previously set up radio connection.
4. The method of claim 1 , wherein performing the channel access procedure includes:
performing the channel access procedure on the first channel;
performing the channel access procedure on the second channel; and
in response to determining that both the first channel and the second channel are idle:
transmitting the first DCI on the first frequency sub-band, and
transmitting the second DCI on the second frequency sub-band.
5. The method of claim 1 , wherein performing the channel access procedure includes:
in response to determining that the first channel is idle, transmitting a wake-up signal (WUS) on the first channel, and
in response to determining that the second channel is idle, transmitting a WUS on the second channel.
6. The method of claim 5 , further including, prior to the performing the channel access procedure:
broadcasting a configuration of the WUS in a cell in which the user device operates.
7. The method of claim 5 , further including, prior to the performing the channel access procedure:
transmitting a format of the WUS to the user device, in a Radio Resource Control (RRC) message.
8. The method of claim 5 , further including, prior to the performing the channel access procedure:
transmitting a Medium Access Control (MAC) element specifying a format of the WUS to the user device.
9. The method of claim 5 , further comprising:
allocating the first time-frequency resource and the second time-frequency resource so that the first time-frequency resource and the second time-frequency resource overlap in at least time or frequency.
10. The method of claim 5 , further comprising:
allocating the first time-frequency resource and the second time-frequency resource so that the first time-frequency resource and the second time-frequency resource overlap in neither time nor frequency.
11. A base station comprising:
a processing hardware; and
a non-transitory computer-readable medium storing thereon instructions which, when executed by the processing hardware, cause the base station to:
transmit, to a user device, indications of (i) a first time-frequency resource including a first frequency sub-band within a bandwidth part (BWP) allocated in an unlicensed spectrum and (ii) a second time-frequency resource including a second frequency sub-band within the BWP;
perform a channel access procedure on (i) a first channel corresponding to the first frequency sub-band, and (ii) a second channel corresponding to the second frequency sub-band, to obtain channel occupancy time on the first channel and the second channel;
transmit, within the obtained channel occupancy time on the first channel, a first downlink control information (DCI) to the user device over a first time-frequency resource that includes the first frequency sub-band; and
transmit, within the obtained channel occupancy time on the second channel, a second DCI to the user device over a second time-frequency resource that includes the second frequency sub-band.
12. The base station of claim 11 , wherein the configuration further specifies a respective offset within a time slot for each of the first time-frequency resource and the second time-frequency resource.
13. The base station of claim 11 , wherein the instructions further cause the base station to:
transmit the indications in one of (i) a Radio Resource Control (RRC) message for setting up a new radio connection, (ii) an RRC message for reconfiguring a previously set up radio connection, or (iii) an RRC message for resuming a previously set up radio connection.
14. The base station of claim 11 , wherein to perform the channel access procedure, the instructions cause the base station to:
perform the channel access procedure on the first channel;
perform the channel access procedure on the second channel; and
in response to determining that both the first channel and the second channel are idle:
transmit the first DCI on the first frequency sub-band, and
transmit the second DCI on the second frequency sub-band.
15. The base station of claim 11 , wherein to perform the channel access procedure, the instructions cause the base station to:
in response to determining that the first channel is idle, transmit a wake-up signal (WUS) on the first channel, and
in response to determining that the second channel is idle, transmit a WUS on the second channel.
16. The base station of claim 15 , wherein the instructions further cause the base station, prior to the performing the channel access procedure, to:
broadcast a configuration of the WUS in a cell in which the user device operates.
17. The base station of claim 15 , wherein the instructions further cause the base station, prior to the performing the channel access procedure:
transmit a format of the WUS to the user device, in a Radio Resource Control (RRC) message.
18. The base station of claim 15 , wherein the instructions further cause the base station, prior to the performing the channel access procedure:
transmit a Medium Access Control (MAC) element specifying a format of the WUS to the user device.
19. The base station of claim 15 , wherein the instructions further cause the base station to:
allocate the first time-frequency resource and the second time-frequency resource so that the first time-frequency resource and the second time-frequency resource overlap in at least time or frequency.
20. The base station of claim 15 , wherein the instructions further cause the base station to:
allocate the first time-frequency resource and the second time-frequency resource so that the first time-frequency resource and the second time-frequency resource overlap in neither time nor frequency.