Method for supporting sidelink-relay in split RAN structure
The present disclosure relates to a communication technique that merges IoT technology with a 5G communication system for supporting higher data transmission rates than 4G systems, and a system for same. The present disclosure may be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, security and safety-related services, etc.) on the basis of 5G communication technology and IoT-related technology. Disclosed is a method for a base station, in which a CU and a DU are split, to service a terminal in a mobile communication system.
1 . A method performed by a distributed unit (DU) of a base station in a communication system, the method comprising:
receiving, from a relay user equipment (UE), a radio resource control (RRC) setup request message of a remote UE with header information of an adaptation layer associated with sidelink relay, wherein the header information is associated with information of the remote UE used for identifying the remote UE for the sidelink relay;
transmitting, to a central unit (CU) of the base station, a first message including the RRC setup request message of the remote UE, a DU UE F1 application protocol (F1AP) ID for the remote UE, and the information of the remote UE; and
receiving, from the CU of the base station, a second message based on the first message, the second message including a CU UE F1AP ID for the remote UE and an RRC setup message associated with the remote UE.
2 . The method of claim 1 ,
wherein the first message is an INITIAL UL RRC MESSAGE TRANSFER message,
wherein the second message is a DL RRC MESSAGE TRANSFER message, and
wherein the DU UE F1AP ID and the CU UE F1AP ID are used for identifying the remote UE over an F1 interface.
3 . The method of claim 1 ,
wherein the information of the remote UE includes at least one of an identification (ID) of the remote UE, and an ID of a radio bearer (RB) associated with the sidelink relay.
4 . The method of claim 1 , further comprising:
transmitting, to the remote UE via the relay UE, the RRC setup message.
5 . A method performed by a central unit (CU) of a base station in a communication system, the method comprising:
receiving, from a distributed unit (DU) of the base station, a first message including a radio resource control (RRC) setup request message of a remote user equipment (UE), a DU UE F1 application protocol (F1AP) identification (ID) of the remote UE, and information of the remote UE used for identifying the remote UE for the sidelink relay;
generating an RRC setup message associated with the RRC setup request message; and
transmitting, to the DU of the base station, a second message including a CU UE F1AP ID for the remote UE and the generated RRC setup message.
6 . The method of claim 5 ,
wherein the first message is an INITIAL UL RRC MESSAGE TRANSFER message,
wherein the second message is a DL RRC MESSAGE TRANSFER message, and
wherein the DU UE F1AP ID and the CU UE F1AP ID are used for identifying the remote UE over an F1 interface.
7 . The method of claim 5 , wherein the information of the remote UE includes an ID of the remote UE.
8 . The method of claim 5 , further comprising:
receiving, from a core network, an INITIAL CONTEXT SETUP REQUEST message including information indicating that the remote UE is authorized for the sidelink relay.
9 . A distributed unit (DU) of a base station in a communication system, the DU of the base station comprising:
a transceiver; and
a controller configured to:
control the transceiver to receive, from a relay user equipment (UE), a radio resource control (RRC) setup request message of a remote UE with header information of an adaptation layer associated with sidelink relay, wherein the header information is associated with information of the remote UE used for indentifying the remote UE for the sidelink relay,
control the transceiver to transmit, to a central unit (CU) of the base station, a first message including the RRC setup request message of the remote UE, a DU UE F1 application protocol (F1AP) ID for the remote UE, and the information of the remote UE, and
control the transceiver to receive, from the CU of the base station, a second message based on the first message, the second message including a CU UE F1AP ID for the remote UE and an RRC setup message associated with the remote UE.
10 . The DU of the base station of claim 9 ,
wherein the first message is an INITIAL UL RRC MESSAGE TRANSFER message,
wherein the second message is a DL RRC MESSAGE TRANSFER message, and
wherein the DU UE F1AP ID and the CU UE F1AP ID are used for identifying the remote UE over an F1 interface.
11 . The DU of the base station of claim 9 ,
wherein the information of the remote UE includes at least one of an identification (ID) of the remote UE, and an ID of a radio bearer (RB) associated with the sidelink relay.
12 . The DU of the base station of claim 9 , wherein the controller is further configured to control the transceiver to transmit, to the remote UE via the relay UE, the RRC setup message.
13 . A central unit (CU) of a base station in a communication system, the CU of the base station comprising:
a transceiver; and
a controller configured to:
control the transceiver to receive, from a distributed unit (DU) of the base station, a first message including a radio resource control (RRC) setup request message of a remote user equipment (UE), a DU UE F1 application protocol (F1AP) identification (ID) of the remote UE, and information of the remote UE used for identifying the remote UE for the sidelink relay,
generate an RRC setup message associated with the RRC setup request message, and
control the transceiver to transmit, to the DU of the base station, a second message including a CU UE F1AP ID for the remote UE and the generated RRC setup message.
14 . The CU of the base station of claim 13 ,
wherein the information of the remote UE includes an ID of the remote UE,
wherein the first message is an INITIAL UL RRC MESSAGE TRANSFER message,
wherein the second message is a DL RRC MESSAGE TRANSFER message, and
wherein the DU UE F1AP ID and the CU UE F1AP ID are used for identifying the remote UE over an F1 interface.
15 . The CU of the base station of claim 13 , wherein the controller is further configured to control the transceiver to receive, from a core network, an INITIAL CONTEXT SETUP REQUEST message including information indicating that the remote UE is authorized for the sidelink relay.