DCI for controlling LTE sidelink communication
One embodiment of the present disclosure provides a method for a first device carrying out Long-Term Evolution (LTE) sidelink (SL) communication via downlink control information (DCI). The method comprises the steps of: receiving DCI from a NR base station via a physical downlink control channel (PDCCH); on the basis of the DCI, acquiring a first timing offset, and a second timing offset which is associated with LTE SL communication; and carrying out LTE SL communication from the time point of the very first LTE SL communication determined on the basis of the first timing offset and the second timing offset.
1. A method for performing, by a first device, long-term evolution (LTE) sidelink (SL) transmission, the method comprising:
obtaining a minimum latency related to a first timing offset based on a capability of the first device;
transmitting, to a base station, a user equipment (UE) capability information message including information regarding the minimum latency;
receiving, from the base station through a physical downlink control channel (PDCCH), downlink control information (DCI) for scheduling of the LTE SL transmission, wherein the DCI includes information regarding the first timing offset related to the minimum latency, information regarding a second timing offset related to activation of a SL semi persistent scheduling (SPS) configuration, index information of the SL SPS configuration, and information representing activation or release of the SL SPS configuration; and
performing the LTE SL transmission based on the DCI,
wherein the first device is not allowed to perform the LTE SL transmission earlier than a time which is obtained based on a sum of the first timing offset and the second timing offset, and
wherein the LTE SL transmission including physical sidelink control channel (PSCCH) transmission and physical sidelink shared channel (PSSCH) transmission.
2. The method of claim 1 , wherein the UE capability information message is a radio resource control (RRC) message.
3. The method of claim 1 , wherein the time is obtained by adding the first timing offset, the second timing offset and four to a first value.
4. The method of claim 3 , wherein the first value is obtained by subtracting a second value from a time when the DCI is received.
5. The method of claim 4 , wherein the second value is obtained by multiplying a basic time unit by a timing advance between downlink and uplink divided by two.
6. The method of claim 3 , wherein a unit of the time is millisecond.
7. The method of claim 1 , wherein, based on the information representing activation of the SL SPS configuration, the first device is not allowed to perform the LTE SL transmission earlier than the time which is obtained based on the sum of the first timing offset and the second timing offset.
8. The method of claim 1 , wherein, based on the information representing activation of the SL SPS configuration, the LTE SL transmission is performed based on the DCI, except that the LTE SL transmission starts no earlier than the time which is obtained based on the sum of the first timing offset and the second timing offset.
9. A first device adapted to perform long-term evolution (LTE) sidelink (SL) transmission, the first device comprising:
at least one transceiver;
at least one processor; and
at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the first device to perform operations comprising:
obtaining a minimum latency related to a first timing offset based on a capability of the first device;
transmitting, to a base station, a user equipment (UE) capability information message including information regarding the minimum latency;
receiving, from the base station through a physical downlink control channel (PDCCH), downlink control information (DCI) for scheduling of the LTE SL transmission, wherein the DCI includes information regarding the first timing offset related to the minimum latency, information regarding a second timing offset related to a SL semi persistent scheduling (SPS) configuration, index information of the SL SPS configuration, and information representing activation or release of the SL SPS configuration; and
performing the LTE SL transmission based on the DCI,
wherein the first device is not allowed to perform the LTE SL transmission earlier than a time which is obtained based on a sum of the first timing offset and the second timing offset, and
wherein the LTE SL transmission including physical sidelink control channel (PSCCH) transmission and physical sidelink shared channel (PSSCH) transmission.
10. The first device of claim 9 , wherein the UE capability information message is a radio resource control (RRC) message.
11. The first device of claim 9 , wherein the time is obtained by adding the first timing offset, the second timing offset and four to a first value,
wherein the first value is obtained by subtracting a second value from a time when the DCI is received, and
wherein the second value is obtained by multiplying a basic time unit by a timing advance between downlink and uplink divided by two.
12. The first device of claim 9 , wherein, based on the information representing activation of the SL SPS configuration, the first device is not allowed to perform the LTE SL transmission earlier than the time which is obtained based on the sum of the first timing offset and the second timing offset.
13. The first device of claim 9 , wherein, based on the information representing activation of the SL SPS configuration, the LTE SL transmission is performed based on the DCI, except that the LTE SL transmission starts no earlier than the time which is obtained based on the sum of the first timing offset and the second timing offset.
14. A processing device adapted to control a first device to perform long-term evolution (LTE) sidelink (SL) transmission, the processing device comprising:
at least one processor; and
at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the first device to perform operations comprising:
obtaining a minimum latency related to a first timing offset based on a capability of the first device;
transmitting, to a base station, a user equipment (UE) capability information message including information regarding the minimum latency;
receiving, from the base station through a physical downlink control channel (PDCCH), downlink control information (DCI) for scheduling of the LTE SL transmission, wherein the DCI includes information regarding the first timing offset related to the minimum latency, information regarding a second timing offset related to a SL semi persistent scheduling (SPS) configuration, index information of the SL SPS configuration, and information representing activation or release of the SL SPS configuration; and
performing the LTE SL transmission based on the DCI,
wherein the first device is not allowed to perform the LTE SL transmission earlier than a time which is obtained based on a sum of the first timing offset and the second timing offset, and
wherein the LTE SL transmission including physical sidelink control channel (PSCCH) transmission and physical sidelink shared channel (PSSCH) transmission.
15. The processing device of claim 14 , wherein the UE capability information message is a radio resource control (RRC) message.
16. The processing device of claim 14 , wherein the time is obtained by adding the first timing offset, the second timing offset and four to a first value, wherein the first value is obtained by subtracting a second value from a time when the DCI is received, and
wherein the second value is obtained by multiplying a basic time unit by a timing advance between downlink and uplink divided by two.
17. The processing device of claim 14 , wherein, based on the information representing activation of the SL SPS configuration, the first device is not allowed to perform the LTE SL transmission earlier than the time which is obtained based on the sum of the first timing offset and the second timing offset.