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1. WO2020198715 - TRANSMISSIONS DE DIFFUSION UNIQUE ET DE DIFFUSION DE GROUPE SUR LIAISON LATÉRALE

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[ EN ]

CLAIMS

1 . A method comprising:

transmitting, from a first wireless communication device that is a group leader of a group of wireless communication devices, a groupcast transmission over a sidelink channel to other wireless communication devices within the group of wireless communication devices; and

transmitting, from the first wireless communication device, a unicast transmission over the sidelink channel to at least one of the other wireless communication devices.

2. The method of claim 1 , wherein the wireless communication devices are vehicle user equipment devices (VUEs).

3. The method of claim 2, wherein the group is a platoon of VUEs.

4. The method of claim 1 , further comprising:

receiving, at the first wireless communication device, feedback messages from one or more of the other wireless communication devices; and

determining, by the first wireless communication device, whether to initiate transmitting the unicast transmission based, at least partially, on the received feedback messages.

5. The method of claim 4, wherein the feedback messages are Hybrid Automatic Repeat Request (HARQ) feedback messages.

6. The method of claim 4, wherein the feedback messages are keep-alive response messages.

7. The method of claim 1 , wherein first wireless communication device simultaneously transmits the groupcast transmission and the unicast transmission.

8. The method of claim 7, wherein the groupcast transmission contains a first set of data and the unicast transmission contains a second set of data that is the same as the first set of data.

9. The method of claim 1 , wherein the groupcast transmission includes an indication that transmission of data via groupcast transmission will be switched to transmission of data via unicast transmission.

10. The method of claim 9, further comprising:

receiving, at the first wireless communication device from a second wireless communication device that is outside of a communication range of the first wireless communication device, a unicast transmission.

11. The method of claim 1 , wherein the groupcast transmission and the unicast transmission are transmitted on separate data bearers.

12. The method of claim 1 , wherein the groupcast transmission and the unicast transmission are transmitted on a same, single data bearer.

13. The method of claim 12, wherein the same, single data bearer is split at a Packet Data Convergence Protocol level, the groupcast transmission transmitted over a first radio link from the split same, single data bearer, the unicast transmission transmitted over a second radio link from the split same, single data bearer.

14. A wireless communication device that is a group leader of a group of wireless communication devices, the wireless communication device comprising:

a transmitter configured to:

transmit a groupcast transmission over a sidelink channel to other wireless communication devices within the group of wireless communication devices, and transmit a unicast transmission over the sidelink channel to at least one of the other wireless communication devices.

15. The wireless communication device of claim 14, wherein the wireless

communication device and the other wireless communication devices are vehicle user equipment devices (VUEs).

16. The wireless communication device of claim 15, wherein the group is a platoon of VUEs.

17. The wireless communication device of claim 14, further comprising:

a receiver configured to receive feedback messages from one or more of the other wireless communication devices; and

a controller configured to determine whether to initiate transmitting the unicast transmission based, at least partially, on the received feedback messages.

18. The wireless communication device of claim 14, wherein the transmitter is further configured to simultaneously transmit the groupcast transmission and the unicast transmission.

19. The wireless communication device of claim 18, wherein the groupcast transmission contains a first set of data and the unicast transmission contains a second set of data that is the same as the first set of data.

20. The wireless communication device of claim 14, wherein the groupcast transmission includes an indication that transmission of data via groupcast transmission will be switched to transmission of data via unicast transmission.

21. The wireless communication device of claim 20, further comprising:

a receiver configured to receive, from another wireless communication device that is outside of a communication range of the wireless communication device, a unicast transmission.

22. The wireless communication device of claim 14, wherein the transmitter is further configured to transmit the groupcast transmission and the unicast transmission on separate data bearers.

23. The wireless communication device of claim 14, wherein transmitter is further configured to transmit the groupcast transmission and the unicast transmission on a same, single data bearer.

24. The wireless communication device of claim 23, wherein the same, single data bearer is split at a Packet Data Convergence Protocol level, the groupcast transmission transmitted over a first radio link from the split same, single data bearer, the unicast transmission transmitted over a second radio link from the split same, single data bearer.