Method and apparatus for radio bearer configuration to support UE-to-network relaying in a wireless communication system
A method and device are disclosed for radio bearer configuration to support User Equipment-to-Network (UE-to-Network) relaying from the perspective of a relay UE. In one embodiment, the relay UE establishes a PC5-Radio Resource Control (PC5-RRC) connection with a remote UE. The relay UE also transmits a RRC message to a network node to request a radio bearer configuration to support UE-to-Network relaying. Furthermore, the relay UE receives a RRC Reconfiguration message from the network node, wherein the RRC Reconfiguration message includes a Uu configuration for a Uu Radio Link Control (RLC) bearer associated with a signalling radio bearer (SRB). In addition, the relay UE receives a RRC Reconfiguration Complete message from the remote UE. The relay UE also transmits the RRC Reconfiguration Complete message on the Uu RLC bearer to the network node.
1. A method for radio bearer configuration to support User Equipment-to-Network (UE-to-Network) relaying, comprising:
a relay UE establishes a PC5-Radio Resource Control (PC5-RRC) connection with a remote UE;
the relay UE transmits a RRC message to a network node to request a radio bearer configuration to support UE-to-Network relaying;
the relay UE receives a RRC Reconfiguration message from the network node, wherein the RRC Reconfiguration message includes a Uu configuration for a Uu Radio Link Control (RLC) bearer associated with a signalling radio bearer (SRB);
the relay UE receives a RRC Reconfiguration Complete message from the remote UE; and
the relay UE transmits the RRC Reconfiguration Complete message on the Uu RLC bearer to the network node.
2. The method of claim 1 , wherein the RRC Reconfiguration message includes a Sidelink (SL) configuration for a SL RLC bearer associated with the SRB.
3. The method of claim 2 , wherein the RRC Reconfiguration Complete message is received by the relay UE on the SL RLC bearer from the remote UE.
4. The method of claim 1 , wherein the RRC Reconfiguration message includes a local UE Identity (ID) of the remote UE.
5. The method of claim 1 , wherein the RRC message is transmitted by the relay UE after a RRC connection is established between the relay UE and the network node.
6. The method of claim 1 , wherein the SRB is SRB1.
7. The method of claim 1 , wherein the RRC Reconfiguration Complete message is included in an adaptation layer Protocol Data Unit (PDU) by the relay UE and wherein a header of the adaptation layer PDU includes a local UE Identity (ID) of the remote UE.
8. A method for radio bearer configuration to support User Equipment-to-Network (UE-to-Network) relaying, comprising:
a network node receives a Radio Resource Control (RRC) message from a relay UE to request a radio bearer configuration to support UE-to-Network relaying;
the network node transmits a RRC Reconfiguration message to the relay UE, wherein the RRC Reconfiguration message includes a Uu configuration for a Uu Radio Link Control (RLC) bearer associated with a signalling radio bearer (SRB); and
the network node receives a RRC Reconfiguration Complete message on the Uu RLC bearer from the relay UE, wherein the RRC Reconfiguration Complete message is received by the relay UE from a remote UE.
9. The method of claim 8 , wherein the RRC Reconfiguration message includes a Sidelink (SL) configuration for a SL RLC bearer associated with the SRB.
10. The method of claim 9 , wherein the RRC Reconfiguration Complete message is received by the relay UE on the SL RLC bearer from the remote UE.
11. The method of claim 8 , wherein the RRC Reconfiguration message includes a local UE Identity (ID) of the remote UE.
12. The method of claim 8 , wherein the RRC message is transmitted by the relay UE after a RRC connection is established between the relay UE and the network node.
13. The method of claim 8 , wherein the SRB is SRB1.
14. The method of claim 8 , wherein the RRC Reconfiguration Complete message is included in an adaptation layer Protocol Data Unit (PDU) by the relay UE and wherein a header of the adaptation layer PDU includes a local UE Identity (ID) of the remote UE.
15. A relay User Equipment (UE), comprising:
a control circuit;
a processor installed in the control circuit; and
a memory installed in the control circuit and operatively coupled to the processor;
wherein the processor is configured to execute a program code stored in the memory to:
establish a PC5-Radio Resource Control (PC5-RRC) connection with a remote UE;
transmit a RRC message to a network node to request a radio bearer configuration to support UE-to-Network relaying;
receive a RRC Reconfiguration message from the network node, wherein the RRC Reconfiguration message includes a Uu configuration for a Uu Radio Link Control (RLC) bearer associated with a signalling radio bearer (SRB);
receive a RRC Reconfiguration Complete message from the remote UE; and
transmit the RRC Reconfiguration Complete message on the Uu RLC bearer to the network node.
16. The relay UE of claim 15 , wherein the RRC Reconfiguration message includes a Sidelink (SL) configuration for a SL RLC bearer associated with the SRB.
17. The relay UE of claim 16 , wherein the RRC Reconfiguration Complete message is received by the relay UE on the SL RLC bearer from the remote UE.
18. The relay UE of claim 15 , wherein the RRC Reconfiguration message includes a local UE Identity (ID) of the remote UE.
19. The relay UE of claim 15 , wherein the RRC message is transmitted by the relay UE after a RRC connection is established between the relay UE and the network node.
20. The relay UE of claim 15 , wherein the RRC Reconfiguration Complete message is included in an adaptation layer Protocol Data Unit (PDU) by the relay UE and wherein a header of the adaptation layer PDU includes a local UE Identity (ID) of the remote UE.