Method and device for resource selection in NR V2X
Provided herein is a method for performing, by a first apparatus ( 100 ), resource selection in a wireless communication system. The method may include the steps of receiving system information including configuration information related to exceptional pools from a base station ( 200 ); selecting the first exceptional pool or the second exceptional pool, based on at least one of a physical layer problem, a connection re-establishment, a handover, or a normal resource pool which is unavailable; selecting a resource from the selected exceptional pool; and performing a sidelink (SL) communication using the resource.
1. A method for performing, by a first apparatus device, wireless communication, the method comprising:
obtaining information related to one exceptional pool;
determining to use the one exceptional pool, based on occurrence of an exceptional case;
selecting a first resource from the one exceptional pool;
transmitting, to a second device, sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH), based on the first resource;
transmitting, to the second device, a medium access control (MAC) protocol data unit (PDU) through the PSSCH, based on the first resource; and
receiving a first hybrid automatic repeat request (HARQ) feedback related to the MAC PDU through a physical sidelink feedback channel (PSFCH), based on a first HARQ feedback resource,
wherein the one exceptional pool includes at least one HARQ feedback resource, for the MAC PDU in which a HARQ feedback is set to enabled, and
wherein the one exceptional pool with no HARQ feedback resource is not allowed, for the MAC PDU in which a HARQ feedback is set to enabled.
2. The method of claim 1 , wherein the exceptional case occurs based on a quality of service (QoS).
3. The method of claim 1 , wherein feedback received through the PSFCH includes at least one of the first HARQ feedback, channel state information (CSI), or closed-loop power control parameters.
4. The method of claim 1 , wherein the exceptional case occurs based on at least one of a physical layer problem, a connection re-establishment, a handover, or a normal resource pool which is unavailable.
5. The method of claim 1 , wherein the exceptional case occurs based on at least one of a cell reselection, a beam failure, or a beam reselection.
6. The method of claim 1 , wherein the information related to the one exceptional pool is configured based on a validity area, and
wherein the validity area includes at least one of a single sidelink zone, a sector, a single beam, or a set of cells.
7. The method of claim 1 ,
wherein the first resource is selected based on a resource selection mechanism which includes random resource selection or short-term sensing resource selection.
8. The method of claim 1 , further comprising:
transmitting a request for a configuration related to an exceptional pool to a base station,
wherein the information related to the one exceptional pool is received based on the request.
9. A first device for performing wireless communication, the first device comprising:
one or more memories storing instructions;
one or more transceivers; and
one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to:
obtain information related to one exceptional pool;
determine to use the one exceptional pool, based on occurrence of an exceptional case;
select a first resource from the one exceptional pool;
transmit, to a second device, sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH), based on the first resource;
transmit, to the second device, a medium access control (MAC) protocol data unit (PDU) through the PSSCH, based on the first resource; and
receive a first hybrid automatic repeat request (HARQ) feedback related to the MAC PDU through a physical sidelink feedback channel (PSFCH), based on a first HARQ feedback resource,
wherein the one exceptional pool includes at least one HARQ feedback resource, for the MAC PDU in which a HARQ feedback is set to enabled, and
wherein the one exceptional pool with no HARQ feedback resource is not allowed, for the MAC PDU in which a HARQ feedback is set to enabled.
10. A device configured to control a first user equipment (UE), the device comprising:
one or more processors; and
one or more memories operably connectable to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to:
obtain information related to one exceptional pool;
determine to use the one exceptional pool, based on occurrence of an exceptional case;
select a first resource from the one exceptional pool;
transmit, to a second UE, sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH), based on the first resource;
transmit, to the second UE, a medium access control (MAC) protocol data unit (PDU) through the PSSCH, based on the first resource; and
receive a first hybrid automatic repeat request (HARQ) feedback related to the MAC PDU through a physical sidelink feedback channel (PSFCH), based on a first HARQ feedback resource,
wherein the one exceptional pool includes at least one HARQ feedback resource, for the MAC PDU in which a HARQ feedback is set to enabled, and
wherein the one exceptional pool with no HARQ feedback resource is not allowed, for the MAC PDU in which a HARQ feedback is set to enabled.