DCI for controlling LTE sidelink communication

1. A method for performing long-term evolution (LTE) sidelink (SL) communication through downlink control information (DCI) by a first apparatus, the method including:

receiving downlink control information (DCI) through a physical downlink control channel (PDCCH) from a new radio (NR) base station;

obtaining a first timing offset and a second timing offset related to LTE SL communication based on the DCI; and

performing the LTE SL communication from an initial LTE SL communication time determined based on the first timing offset and the second timing offset,

wherein a time after a lapse of the first timing offset from a time when the first apparatus receives the DCI from the NR base station is equal to a time when it is determined that the first apparatus has received LTE dedicated DCI from an LTE base station with respect to the LTE SL communication.

2. The method of claim 1 , wherein a minimum value of the first timing offset is determined based on a minimum latency between an NR module of the first apparatus for an NR communication and an LTE module of the first apparatus for an LTE communication.

3. The method of claim 2 , wherein the minimum latency represents a minimum value of a time taken from when the DCI is received by the NR module to when the DCI is converted into LTE SL DCI by the first apparatus, the LTE SL DCI is transmitted by the first apparatus and is received by the LTE module.

4. The method of claim 3 , wherein the minimum latency is based on apparatus capability of the first apparatus.

5. The method of claim 4 , wherein the first timing offset is equal to or greater than the minimum latency.

6. The method of claim 5 , wherein the LTE SL communication is performed based on information on LTE SL communication included in the DCI.

7. The method of claim 6 , wherein the information on the LTE SL communication includes the second timing offset, and

wherein the second timing offset is added at a time after a lapse of the first timing offset from a starting point which is a time when the NR module receives the DCI.

8. The method of claim 7 , wherein the second timing offset is a timing offset related to activation of LTE semi-persistent scheduling (SPS).

9. The method of claim 8 , wherein the performing the LTE SL communication includes,

determining a time to determine whether to activate the LTE SPS based on a time after a lapse of the first timing offset and the second timing offset from the time when the NR module receives the DCI; and

determining whether to activate the LTE SPS at the time to determine whether to activate the LTE SPS.

10. The method of claim 9 , wherein the time for determining whether to activate the LTE SPS is determined based on a first subframe after a time when the first timing offset and the second timing offset have elapsed from the time when the NR module received the DCI.

11. The method of claim 10 , further including:

receiving the LTE dedicated DCI from the LTE base station based on the LTE module,

wherein the second timing offset included in the DCI is equal to a third timing offset related to the LTE SL communication included in the LTE dedicated DCI.

12. The method of claim 10 , wherein the second timing offset included in the DCI is equal to a fourth timing offset applied to an LTE dedicated module for LTE SL communication included in the second apparatus, and

wherein the fourth timing offset is included in the LTE dedicated DCI received from the LTE base station to the LTE dedicated module of the second apparatus.

13. The method of claim 12 , wherein a first LTE SL configuration grant type-2 resource activated by the LTE module of the first apparatus based on the DCI is based on the second timing offset, and

wherein a second LTE SL configuration grant type-2 activated by the LTE dedicated module of the second apparatus based on the LTE dedicated DCI is based on the fourth timing offset.

14. A first apparatus for performing LTE SL communication through DCI, the first apparatus comprising:

at least one memory to store instructions;

at least one transceiver; and

at least one processor to connect the at least one memory and the at least one transceiver,

wherein the at least one processor is configured to:

control the at least one transceiver to receive downlink control information (DCI) through a physical downlink control channel (PDCCH) from a new radio (NR) base station,

obtain a first timing offset and a second timing offset related to LTE SL communication based on the DCI, and

perform the LTE SL communication from an initial LTE SL communication time determined based on the first timing offset and the second timing offset,

wherein a time after a lapse of the first timing offset from a time when the first apparatus receives the DCI from the NR base station is equal to a time when it is determined that the first apparatus has received LTE dedicated DCI from an LTE base station with respect to the LTE SL communication.

15. An apparatus for controlling a first terminal, the apparatus comprising:

at least one processor; and

at least one computer memory that is connected to be executable by the at least one processor and stores instructions,

wherein, when the at least one processor executes the instructions, the first terminal is configured to:

receive downlink control information (DCI) through a physical downlink control channel (PDCCH) from a new radio (NR) base station,

obtain a first timing offset and a second timing offset related to LTE SL communication based on the DCI, and

perform the LTE SL communication from an initial LTE SL communication time determined based on the first timing offset and the second timing offset,

wherein a time after a lapse of the first timing offset from a time when the first apparatus receives the DCI from the NR base station is equal to a time when it is determined that the first apparatus has received LTE dedicated DCI from an LTE base station with respect to the LTE SL communication.