Apparatus and method for performing vehicle to everything communication

1. A user equipment for performing vehicle to everything (V2X) communication, comprising:

a memory;

a transceiver; and

a processor coupled to the memory and the transceiver,

wherein the processor is configured to:

control the transceiver to receive a network configuration of a plurality of configured grant-free resources within a network scheduled sidelink resource from a base station; and

after receiving the configuration, upon an arrival of a sidelink data packet from an upper layer of the user equipment for transmission, perform the V2X communication using the received configured grant-free resources;

wherein upon the arrival of the sidelink data packet from the upper layer of the user equipment for transmission, the transceiver performs a sidelink transmission of a data transport block (TB) using the configured grant-free resources within a latency time period requirement which is according to a proximity service (ProSe) per packet priority (PPPP) level of the sidelink data packet.

2. The user equipment of claim 1 , wherein the sidelink transmission of the data TB using the configured grant-free resources comprises an initial transmission and a re-transmission of a same data TB.

3. The user equipment of claim 2 , wherein the initial transmission and the re-transmission of the same data TB are in different subframes of the network scheduled sidelink resource.

4. The user equipment of claim 1 , wherein the processor is configured to perform the V2X communication using the configured grant-free resources according to a plurality of sidelink control information (SCI) parameters in a physical sidelink control channel (PSCCH).

5. The user equipment of claim 4 , wherein the SCI parameters comprises at least one of a resource reservation field, a priority field, a time gap, or a frequency resource location.

6. The user equipment of claim 5 , wherein the resource reservation field is set according to a number of data TB transmissions within a predetermined period.

7. The user equipment of claim 5 , wherein the priority field is set based on a PPPP level associated with a latency requirement of a data TB.

8. The user equipment of claim 5 , wherein the time gap is according to a resource availability within a sidelink transmission of the data TB, and the frequency resource location is according to a frequency hopping rule.

9. A method for performing vehicle to everything (V2X) communication of a user equipment, comprising:

receiving a network configuration of a plurality of configured grant-free resources within a network scheduled sidelink resource from a base station; and

after receiving the configuration, upon an arrival of a sidelink data packet from an upper layer of the user equipment for transmission, performing the V2X communication using the received configured grant-free resources;

wherein upon the arrival of the sidelink data packet from the upper layer of the user equipment for transmission, the method comprises performing a sidelink transmission of a data transport block (TB) using the configured grant-free resources within a latency time period requirement which is according to a proximity service (ProSe) per packet priority (PPPP) level of the sidelink data packet.

10. The method of claim 9 , wherein the sidelink transmission of the data TB using the configured grant-free resources comprises an initial transmission and a re-transmission of a same data TB.

11. The method of claim 10 , wherein the initial transmission and the re-transmission of the same data TB are in different subframes of the network scheduled sidelink resource.

12. The method of claim 9 , further comprising performing the V2X communication using the configured grant-free resources according to a plurality of sidelink control information (SCI) parameters in a physical sidelink control channel (PSCCH).

13. The method of claim 12 , wherein the SCI parameters comprise at least one of a resource reservation field, a priority field, a time gap, or a frequency resource location.

14. The method of claim 13 , wherein the resource reservation field is set according to a number of data TB transmissions within a predetermined period.

15. The method of claim 13 , wherein the priority field is set based on a PPPP level associated with a latency requirement of a data TB.

16. The method of claim 13 , wherein the time gap is according to a resource availability within a sidelink transmission of the data TB, and the frequency resource location is according to a frequency hopping rule.