Transmission of PSCCH and PSSCH in sidelink communication
A method for performing wireless communication by a first device and a device for supporting same are provided. The method may include receiving, from a second device, a Physical Sidelink Control Channel (PSCCH) and a Physical Sidelink Shared Channel (PSSCH), based on information on a first transmission power for the PSCCH and the PSSCH, included in the PSCCH or the PSSCH, determining a first Reference Signal Received Power (RSRP) of a DM-RS (Demodulation-Reference Signal) received through the PSSCH, and performing sidelink communication based on the determined first RSRP. For example, the information on the first transmission power is based on a maximum transmission power and an allowable threshold.
1. A method for performing wireless communication by a first device, the method comprising:
receiving, from a second device, a physical control channel for device-to-device direct communication, and a physical shared channel for device-to-device direct communication;
based on information regarding a first transmission power for the physical control channel and the physical shared channel being, included in the physical control channel or the physical shared channel, determining a first reference signal received power (RSRP) of a demodulation-reference signal (DM-RS) received through the physical shared channel; and
performing a device-to-device direct communication based on the determined first RSRP,
wherein the information regarding the first transmission power is based on a maximum transmission power and an allowable threshold,
wherein the information regarding the first transmission power includes a first offset for a difference between the maximum transmission power and the first transmission power, and
wherein, based on the first transmission power being equal to or less than the maximum transmission power minus the allowable threshold, the first RSRP is determined by adding, to a second RSRP, a second offset determined based on the first offset, the second RSRP being a RSRP measurement value of the DM-RS.
2. The method of claim 1 , wherein the information regarding the first transmission power includes a field representing whether the first transmission power is equal to or less than the maximum transmit power minus the allowable threshold.
3. The method of claim 1 , wherein the allowable threshold is determined based on at least one of a service type, priority, requirements, cast type, or congestion level.
4. The method of claim 1 , wherein the maximum transmission power is determined based on a pre-configured open loop power control (OLPC) parameter.
5. The method of claim 1 ,
wherein, based on the first transmission power being determined based on a pathloss measurement value for direct link between devices or a pathloss measurement value for network-to-device link, the physical control channel and the physical shared channel are transmitted from the second device to the first device on a first resource pool,
wherein, based on the first transmission power being not determined based on the pathloss measurement value for direct link between devices or the pathloss measurement value for network-to-device link, the physical control channel and the physical shared channel are transmitted from the second device to the first device on a second resource pool, and
wherein the first resource pool and the second resource pool do not overlap each other.
6. The method of claim 5 , wherein a time resource period of the first resource pool and a time resource period of the second resource pool may be adjacent to each other.
7. The method of claim 1 , further comprising:
transmitting a physical feedback channel for the physical shared channel to the second device, and
wherein an upper bound of a second transmission power for the physical feedback channel is determined based on a maximum DL RSRP related with a resource pool through which the physical control channel and the physical shared channel are transmitted.
8. A first device configured to operate in a wireless communication system, 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 perform operations comprising:
receiving, from a second device, a physical control channel for device-to-device direct communication, and a physical shared channel for device-to-device direct communication;
based on information regarding a first transmission power for the physical control channel and the physical shared channel being included in the physical control channel or the physical shared channel, determining a first reference signal received power (RSRP) of a demodulation-reference signal (DM-RS) received through the physical shared channel; and
performing a device-to-device direct communication based on the determined first RSRP,
wherein the information regarding the first transmission power is based on a maximum transmission power and an allowable threshold,
wherein the information regarding the first transmission power includes a first offset for a difference between the maximum transmission power and the first transmission power, and
wherein, based on the first transmission power being equal to or less than the maximum transmission power minus the allowable threshold, the first RSRP is determined by adding, to a second RSRP, a second offset determined based on the first offset, the second RSRP being a RSRP measurement value of the DM-RS.
9. The first device of claim 8 , wherein the information regarding the first transmission power includes a field representing whether the first transmission power is equal to or less than the maximum transmit power minus the allowable threshold.
10. A device configured to control a first user equipment (UE), the device comprising:
one or more processors; and
one or more memories being operably connectable to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to perform operations comprising:
receiving, from a second device, a physical control channel for device-to-device direct communication, and a physical shared channel for device-to-device direct communication;
based on information regarding a first transmission power for the physical control channel and the physical shared channel being included in the physical control channel or the physical shared channel, determining a first reference signal received power (RSRP) of a demodulation-reference signal (DM-RS) received through the physical shared channel; and
performing a device-to-device direct communication based on the determined first RSRP,
wherein the information regarding the first transmission power is based on a maximum transmission power and an allowable threshold,
wherein the information regarding the first transmission power includes a first offset for a difference between the maximum transmission power and the first transmission power, and
wherein, based on the first transmission power being equal to or less than the maximum transmission power minus the allowable threshold, the first RSRP is determined by adding, to a second RSRP, a second offset determined based on the first offset, the second RSRP being a RSRP measurement value of the DM-RS.