Methods and apparatuses for indicating a set of resources on a NR sidelink
Embodiments of the present disclosure relate to methods and apparatuses for indicating a set of resources on a new radio (NR) sidelink under 3GPP (3rd Generation Partnership Project) 5G system. According to an embodiment of the present disclosure, a method includes: receiving coordination information from another UE; determining a time boundary in time domain based on the coordination information; and in response to successfully determining a set of resources in at least one domain of time and frequency domains and in response to successfully determining a resource in the time and frequency domains, transmitting, to the abovementioned another UE, signaling on the resource before the time boundary, wherein the signaling indicates the set of resources.
1 . A method performed by a first user equipment (UE), the method comprising:
receiving coordination information from a second UE;
determining a time boundary in a time domain based on the coordination information;
determining a set of resources in at least the time domain based on the time boundary, wherein the set of resources comprises candidate resources for sidelink communication;
determining a resource in the time domain and a frequency domain, wherein the resource is for transmitting signaling indicating the set of resources and is before the time boundary; and
transmitting, to the second UE, the signaling indicating the set of resources on the resource.
2 . The method of claim 1 , wherein the set of resources is located in a window in the time domain.
3 . The method of claim 2 , wherein a start time instance of the window is the time boundary.
4 . The method of claim 2 , wherein a length of the window is:
a fixed value;
configured or pre-configured per a resource pool; or
indicated by the second UE.
5 . The method of claim 1 , wherein the coordination information includes at least one of:
a period length in the time domain of periodic traffic of the second UE; or
total times of transmitting signaling for indicating one or more sets of resources for the periodic traffic.
6 . The method of claim 5 , further comprising, in response to the coordination information including the period length:
determining a second time boundary in the time domain based on the time boundary and the period length; and
in response to successfully determining a second set of resources in at least one of the time domain or the frequency domain and in response to successfully determining a second resource in the time domain and the frequency domain, transmitting, to the second UE, second signaling on the second resource before the second time boundary, wherein the second signaling indicates the second set of resources.
7 . The method of claim 1 , further comprising:
transmitting, to a network or a base station (BS), a request via a dedicated scheduling request (SR) resource; and
receiving, from the network or the base station, signaling indicating the resource.
8 . A first user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the first UE to:
transmit, to a second UE, coordination information;
in response to the second UE determining a set of resources in at least a time domain and a resource in the time domain and a frequency domain, receive, from the second UE and on the resource, signaling indicating the set of resources, wherein a time boundary is determined based on the coordination information, the set of resources comprises candidate resources for sidelink communication, and the resource is before the time boundary; and
perform a resource selection procedure by taking the set of resources into account to select a transmission resource.
9 . The first UE of claim 8 , wherein the set of resources is located in a window in the time domain.
10 . The first UE of claim 9 , wherein a start time instance of the window is the time boundary.
11 . The first UE of claim 9 , wherein a length of the window is:
a fixed value;
configured or pre-configured per a resource pool; or
indicated by the first UE.
12 . The first UE of claim 8 , wherein the coordination information includes at least one of:
a period length in the time domain of periodic traffic of the first UE; or
total times of receiving signaling for indicating one or more sets of resources for the periodic traffic.
13 . A first user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the first UE to:
receive coordination information from a user equipment (UE) second UE;
determine a time boundary in a time domain based on the coordination information;
determine a set of resources in at least the time domain based on the time boundary, wherein the set of resources comprises candidate resources for sidelink communication;
determine a resource in the time domain and a frequency domain, wherein the resource is for transmitting signaling indicating the set of resources and is before the time boundary; and
transmit, to the second UE, the signaling indicating the set of resources on the resource.
14 . The first UE of claim 13 , wherein the set of resources is located in a window in the time domain.
15 . The first UE of claim 14 , wherein a start time instance of the window is the time boundary.
16 . The first UE of claim 14 , wherein a length of the window is:
a fixed value;
configured or pre-configured per a resource pool; or
indicated by the second UE.
17 . The first UE of claim 13 , wherein the coordination information includes at least one of:
a period length in the time domain of periodic traffic of the second UE; or
total times of transmitting signaling for indicating one or more sets of resources for the periodic traffic.
18 . The first UE of claim 17 , wherein the at least one processor is further configured to cause the first UE to:
determine a second time boundary in the time domain based on the time boundary and the period length; and
in response to successfully determining a second set of resources in at least one of the time domain or the frequency domain and in response to successfully determining a second resource in the time domain and the frequency domain, transmit, to the second UE, second signaling on the second resource before the second time boundary, wherein the second signaling indicates the second set of resources.
19 . The first UE of claim 13 , wherein the at least one processor is further configured to cause the first UE to:
transmit, to a network or a base station (BS), a request via a dedicated scheduling request (SR) resource; and
receive, from the network or the base station, signaling indicating the resource.
20 . A method performed by a first user equipment (UE), the method comprising:
transmitting, to a second UE, coordination information;
in response to the second UE determining a set of resources in at least a time domain and a resource in the time domain and a frequency domain, receiving, from the second UE and on the resource, signaling indicating the set of resources, wherein a time boundary is determined based on the coordination information, the set of resources comprises candidate resources for sidelink communication, and the resource is before the time boundary; and
performing a resource selection procedure by taking the set of resources into account to select a transmission resource.