Methods and devices for channel occupancy time (COT) sharing
Methods and systems are provided in which a channel occupancy time (COT)-sharing indicator is received, at a first user equipment (UE), from a second UE. The first UE determines whether the first UE is able to use a time-frequency resource within a frequency range indicated by the COT-sharing indicator received from the second UE. In case that the first UE is able to use a time-frequency resource within the frequency range, data is transmitted with COT-sharing between the first UE and the second UE. In case that the first UE is unable to use a time-frequency resource within the frequency range, the data is transmitted without COT-sharing in a first resource selected by the first UE.
1 . A method comprising:
receiving, at a first user equipment (UE), a channel occupancy time (COT)-sharing indicator from a second UE;
determining, by the first UE, whether a time-frequency resource is within a frequency range indicated by the COT-sharing indicator received from the second UE, and whether the first UE is able to use the time-frequency resource;
in case that the first UE is able to use the time-frequency resource within the frequency range, transmitting data with COT-sharing between the first UE and at least the second UE; and
in case that the first UE is unable to use the time-frequency resource within the frequency range, transmitting the data without COT-sharing in a first resource selected by the first UE,
wherein the COT-sharing indicator is received in a sidelink (SL) between the first UE and the second UE, and
wherein the COT-sharing indicator is signaled in 1 st -stage SL control information (SCI) over physical SL control channel (PSCCH) or 2 nd -stage SCI over physical SL shared channel (PSSCH).
2 . The method of claim 1 , wherein, in case that the first UE is able to use the time-frequency resource in the frequency range, the method further comprises selecting, by the first UE, the time-frequency resource from a set of candidate resources identified by a physical layer in a mode 2 sidelink resource selection procedure of the first UE.
3 . The method of claim 1 , wherein the COT-sharing indicator is in a format indicating frequency sub-bands and time slots that are part of a corresponding COT duration.
4 . The method of claim 1 , wherein the COT-sharing indicator is received within an observation window prior to a scheduled time for transmission of the data from the first UE and within at least one of a sensing window and a resource selection window of a sensing-based resource selection procedure of the first UE.
5 . The method of claim 4 , wherein:
the COT-sharing indicator is received within the sensing window of the sensing-based resource selection procedure of the first UE; and
in case that the first UE is able to use the time-frequency resource in the frequency range, the data is transmitted with COT-sharing in the first resource that is within the frequency range indicated by the COT-sharing indicator.
6 . The method of claim 4 , wherein the COT-sharing indicator is received within the resource selection window of the sensing-based resource selection procedure of the first UE.
7 . The method of claim 6 , wherein, in case that the first UE is able to use the time-frequency resource in the frequency range:
the data is transmitted with COT-sharing in the first resource that is within the frequency range indicated by the COT-sharing indicator; or
the method further comprises:
selecting a second resource in the resource selection window for data transmission based on the COT-sharing indicator, wherein the second resource is within the frequency range indicated by the COT-sharing indicator; and
transmitting the data with COT-sharing in the second resource, wherein the second resource is different than the first resource.
8 . The method of claim 1 , wherein:
in case that the first UE is unable to use the time-frequency resource in the frequency range, the method further comprises performing a channel access technique using a contention window to transmit the data without COT-sharing.
9 . The method of claim 1 , wherein determining whether the first UE is able to use the time-frequency resource in the frequency range comprises at least one of comparing the COT-sharing indicator to pre-defined COT-sharing rules, determining whether COT-sharing can accommodate transmission of the data, or determining whether COT-sharing includes a resource previously selected for transmission by the first UE.
10 . A first user equipment (UE) comprising:
a processor; and
a non-transitory computer readable storage medium storing instructions that, when executed, cause the processor to:
receive a channel occupancy time (COT)-sharing indicator from a second UE;
determine whether a time-frequency resource is within a frequency range indicated by the COT-sharing indicator received from the second UE, and whether the first UE is able to use the time-frequency resource;
in case that the first UE is able to use the time-frequency resource within the frequency range, transmit data with COT-sharing between the first UE and at least the second UE; and
in case that the first UE is unable to use the time-frequency resource within the frequency range, transmit the data without COT-sharing in a first resource selected by the first UE,
wherein the COT-sharing indicator is received in a sidelink (SL) between the first UE and the second UE, and
wherein the COT-sharing indicator is signaled in 1 st -stage SL control information (SCI) over physical SL control channel (PSCCH) or 2 nd -stage SCI over physical SL shared channel (PSSCH).
11 . The UE of claim 10 , wherein, in case that the first UE is able to use the time-frequency resource in the frequency range, the instructions further cause the processor to select the time-frequency resource from a set of candidate resources identified by a physical layer in a mode 2 sidelink resource selection procedure of the first UE.
12 . The UE of claim 10 , wherein the COT-sharing indicator is in a format indicating frequency sub-bands and time slots that are part of a corresponding COT duration.
13 . The first UE of claim 10 , wherein the COT-sharing indicator is received within an observation window prior to a scheduled time for transmission of the data from the first UE and within at least one of a sensing window and a resource selection window of a sensing-based resource selection procedure of the first UE.
14 . The first UE of claim 13 , wherein:
the COT-sharing indicator is received within the sensing window of the sensing-based resource selection procedure of the first UE; and
in case that the first UE is able to use the time-frequency resource in the frequency range, the data is transmitted with COT-sharing in the first resource that is within the frequency range indicated by the COT-sharing indicator.
15 . The first UE of claim 14 , wherein the COT-sharing indicator is received within the resource selection window of the sensing-based resource selection procedure of the first UE, and, in case that the first UE is able to use the time-frequency resource in the frequency range;
the data is transmitted with COT-sharing in the first resource that is within the frequency range indicated by the COT-sharing indicator; or
the instructions further cause the processor to:
select a second resource in the resource selection window for data transmission based on the COT-sharing indicator, wherein the second resource is within the frequency range indicated by the COT-sharing indicator; and
transmit the data with COT-sharing in the second resource, wherein the second resource is different than the first resource.
16 . The first UE of claim 10 , wherein:
in case that the first UE is unable to use the time-frequency resource in the frequency range, the instructions further cause the processor to perform a channel access technique using a contention window to transmit the data without COT-sharing.
17 . The first UE of claim 10 , wherein, in determining whether the first UE is able to use the time-frequency resource in the frequency range, the instructions further cause the processor to, at least one of, compare the COT-sharing indicator to pre-defined COT-sharing rules, determine whether COT-sharing can accommodate transmission of the data, or determine whether COT-sharing includes a resource previously selected for transmission by the first UE.
18 . A communication system comprising:
a first user equipment (UE) comprising a processor configured to:
transmit a channel occupancy time (COT)-sharing indicator to one or more other UEs in a sidelink; and
a second UE comprising a processor configured to:
receive the COT-sharing indicator from the first UE;
determine whether a time-frequency resource is within a frequency range indicated by the COT-sharing indicator received from the second UE, and whether the first UE is able to use the time-frequency resource;
in case that the first UE is able to use the time-frequency resource within the frequency range, transmit data with COT-sharing between the first UE and at least the second UE; and
in case that the first UE is unable to use the time-frequency resource within the frequency range, transmit the data without COT-sharing in a resource selected by the first UE,
wherein the COT-sharing indicator is received in a sidelink (SL) between the first UE and the second UE, and
wherein the COT-sharing indicator is signaled in 1 st -stage SL control information (SCI) over physical SL control channel (PSCCH) or 2 nd -stage SCI over physical SL shared channel (PSSCH).