Method and apparatus for transmitting data
Embodiments of the present disclosure provide a method for transmitting data, including: sensing, by a first device, a scheduling assignment (SA) of another device; measuring a received power of the other device, and measuring a total received energy of a subframe/subband; determining a received power reference value and a total received energy reference value of the other device according to the SA; selecting resources; and transmitting data using the selected resources. According to the method of the present disclosure, the performance of the method which avoids collision based on SA is improved, and measurement accuracy of the total received energy of the subband is increased. Thus, resource selection/re-selection can be performed better. As such, interferences between devices can be avoided effectively.
1. A method for transmitting data by a first device, the method comprising:
receiving, from a second device, sidelink scheduling information for the second device on a physical sidelink control channel (PSCCH);
determining a resource for sidelink transmission among a plurality of candidate resources for sidelink transmission based on the sidelink scheduling information; and
transmitting data on a physical sidelink shared channel (PSSCH) based on the determined resource,
wherein a first candidate resource including continuous subbands in a first time resource is excluded among the plurality of candidate resources for sidelink transmission, in case that the first device has not monitored a second time resource and the first time resource is determined based on the second time resource and a resource reservation period.
2. The method of claim 1 , further comprising:
measuring a received power of a demodulation reference signal (DMRS) for the PSSCH based on the sidelink scheduling information,
wherein a second candidate resource is excluded among the plurality of candidate resources for sidelink transmission in case that a received power of a DMRS in the second candidate resource is higher than a threshold.
3. The method of claim 2 ,
wherein the threshold is determined based on a first priority for the first device and a second priority for the second device.
4. The method of claim 1 ,
wherein the first time resource and the second time resource satisfy the following equation:
y+j×P a =m+P q , and
wherein y is the first time resource, j is an integer larger than or equal to 0, P a is a first resource reservation period, m is the second time resource, and P q is a second resource reservation period.
5. A first device for data transmission, the first device comprising:
a transceiver; and
a controller coupled with the transceiver and configured to control to:
receive, from a second device, sidelink scheduling information for the second device on a physical sidelink control channel (PSCCH),
determine a resource for sidelink transmission among a plurality of candidate resources for sidelink transmission based on the sidelink scheduling information, and
transmit data on a physical sidelink shared channel (PSSCH) based on the determined resource,
wherein a first candidate resource including continuous subbands in a first time resource is excluded among the plurality of candidate resources for sidelink transmission, in case that the first device has not monitored a second time resource, and the first time resource is determined based on the second time resource and a resource reservation period.
6. The first device of claim 5 , wherein the controller is configured to:
measure a received power of a demodulation reference signal (DMRS) for the PSSCH based on the sidelink scheduling information,
wherein a second candidate resource is excluded among the plurality of candidate resources for sidelink transmission in case that a received power of a DMRS in the second candidate resource is higher than a threshold.
7. The first device of claim 6 ,
wherein the threshold is determined based on a first priority for the first device and a second priority for the second device.
8. The first device of claim 6 ,
wherein the first time resource and the second time resource satisfy the following equation:
y+j×P a =m+P q , and
wherein y is the first time resource, j is an integer larger than or equal to 0, P a is a first resource reservation period, m is the second time resource, and P q is a second resource reservation period.