Cast type and coordination based inter-UE operation for NR sidelink

1 . A first user equipment comprising a processor, a transceiver unit, and a storage unit, and configured to:

sense a plurality of user equipment in a group to provide sidelink coordination;

determine a coordination type for each of the plurality of user equipment, wherein the coordination type is scheduled and/or assisted;

obtain transmission and reception resources for each of the plurality of user equipment;

determine the transmission and reception resources are dedicated or shared among the plurality of user equipment based on the coordination type;

determine a signaling type for each of the plurality of user equipment based on the coordination type, wherein the signaling type includes different types of assistance information with different payload sizes;

determine whether a payload size for each of the plurality of user equipment, based on the determined signaling type, exceeds a predetermined threshold; and

wherein the signaling type is carried in sidelink control information (SCI) in a physical sidelink shared channel when the payload size is less than the predetermined threshold and a priority rank of the signaling type is above a predetermined level.

2 . The first user equipment of claim 1 , wherein the coordination type is scheduled for one of the plurality of user equipment and the coordination type is assisted for another one of the plurality of user equipment.

3 . The first user equipment of claim 1 , wherein the transmission and reception resources are shared.

4 . The first user equipment of claim 1 , configured to:

determine a priority of the plurality of user equipment based on the coordination type; and

allocate a first subset of the transmission and reception resources to a first one of the plurality of user equipment, and allocate a second subset of the transmission and reception resources to a second one of the plurality of user equipment.

5 . The first user equipment of claim 1 , further configured to receive a capability report from the plurality of user equipment indicating whether a new SCI format is required.

6 . The first user equipment of claim 1 , further configured to send the resources to a second user equipment of the plurality of user equipment along with a transmission/reception indicator in a SCI.

7 . The first user equipment of claim 6 , further configured to send decoding information to the second user equipment.

8 . The first user equipment of claim 1 , wherein the first user equipment is a gNode-B.

9 . The first user equipment of claim 1 , wherein the signaling type is selected from assistance type information, scheduling type information, reserved, and combinations thereof, and wherein the assistance type information includes a type selected from one or more of a hidden node, exposed node, half duplex, or collision.

10 . A method, implemented in a first user equipment, comprising:

sensing a plurality of user equipment in a group to provide sidelink coordination;

determining a coordination type for each of the plurality of user equipment, wherein the coordination type is scheduled and/or assisted;

obtaining transmission and reception resources for each of the plurality of user equipment;

determining the transmission and reception resources are dedicated or shared among the plurality of user equipment based on the coordination type; determining a signaling type for each of the plurality of user equipment based on the coordination type, wherein the signaling type includes different types of assistance information with different payload sizes;

determining whether a payload size for each of the plurality of user equipment, based on the determined signaling type, exceeds a predetermined threshold; and

wherein the signaling type is carried in sidelink control information (SCI) in a physical sidelink shared channel when the payload size is less than the predetermined threshold and a priority rank of the signaling type is above a predetermined level.

11 . The method of claim 10 , wherein the transmission and reception resources are shared.

12 . The method of claim 10 , further comprising:

determining a priority of the plurality of user equipment based on the coordination type; and

allocating a first subset of the transmission and reception resources to a first one of the plurality of user equipment, and allocate a second subset of the transmission and reception resources to a second one of the plurality of user equipment.

13 . The method of claim 10 , further comprising:

sending the resources to a second user equipment of the plurality of user equipment along with a transmission/reception indicator in a SCI.

14 . The method of claim 13 , configured to send decoding information to the second user equipment.

15 . The method of claim 10 , wherein the coordination type is scheduled for one of the plurality of user equipment and the coordination type is assisted for another one of the plurality of user equipment.

16 . The method of claim 10 , comprising receiving a capability report from the plurality of user equipment indicating whether a new SCI format is required.

17 . The method of claim 10 , wherein the first user equipment is a gNode-B.

18 . The method of claim 10 , wherein the signaling type is selected from assistance type information, scheduling type information, reserved, and combinations thereof, and wherein the assistance type information includes a type selected from one or more of a hidden node, exposed node, half duplex, or collision.