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; e 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;
determining a received power for a demodulation reference signal (DMRS) associated with a physical sidelink shared channel (PSSCH) based on the sidelink scheduling information, wherein the received power for the DMRS is measured in a plurality of candidate resources for sidelink transmission;
determining a resource for sidelink transmission among the plurality of candidate resources; and
transmitting data using the determined resource,
wherein a first resource in a first subframe among the plurality of candidate resources is excluded for sidelink transmission in case that the first device has not monitored a second subframe, and the first subframe is determined based on the second subframe and a resource reservation period, and
wherein a second resource among the plurality of candidate resources is excluded for sidelink transmission in case that a received power for a DMRS of the second resource is higher than a threshold.
2. The method of claim 1 ,
wherein the sidelink scheduling information is carried on a physical sidelink control channel (PSCCH) and the data is carried on the PSSCH.
3. The method of claim 1 ,
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 subframe and the second subframe satisfy the following equation:
y+j×P a =m+P q , and
wherein y is the first subframe, j is an integer larger than or equal to 0, P a is a first resource reservation period, m is the second subframe, and P q is a second resource reservation period.
5. The method of claim 1 ,
wherein each of the plurality of candidate resources for sidelink transmission is a set of continuous subbands in a subframe.
6. 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,
determine a received power for a demodulation reference signal (DMRS) associated with a physical sidelink shared channel (PSSCH) based on the sidelink scheduling information, wherein the received power for the DMRS is measured in a plurality of candidate resources for sidelink transmission,
determine a resource for sidelink transmission among the plurality of candidate resources, and
transmit data using the determined resource,
wherein a first resource in a first subframe among the plurality of candidate resources is excluded for sidelink transmission in case that the first device has not monitored a second subframe, and the first subframe is determined based on the second subframe and a resource reservation period, and
wherein a second resource among the plurality of candidate resources is excluded for sidelink transmission in case that a received power for a DMRS of the second resource is higher than a threshold.
7. The first device of claim 6 ,
wherein the sidelink scheduling information is carried on a physical sidelink control channel (PSCCH) and the data is carried on the PSSCH.
8. 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.
9. The first device of claim 6 ,
wherein the first subframe and the second subframe satisfy the following equation:
y+j×P a =m+P q , and
wherein y is the first subframe, j is an integer larger than or equal to 0, P a is a first resource reservation period, m is the second subframe, and P q is a second resource reservation period.
10. The first device of claim 6 ,
wherein each of the plurality of candidate resources for sidelink transmission is a set of continuous subbands in a subframe.