Method for establishing an interface and communication between a relay node and a core network

A relay node (RN) in a wireless communication system, the RN comprising:

• a transceiver configured to transmit and receive a signal;
• and
• a controller coupled with the transceiver and configured to:
• transmit, to a base station, a first message used to establish a radio resource control (RRC) connection between the RN and the base station, the first message including an attach request and information indicating that the RRC connection is for a mobile RN, wherein the base station is connected to a network entity supporting the mobile RN,
• receive, from the base station, a second message including an accept of the attach request with the network entity, the second message further including an IP address of the network entity, and
• establish an interface with the network entity based on the IP address of the network entity included in the second message, wherein the IP address of the network entity is used as a destination address of a request message for establishing the interface.

A method by a base station in a wireless communication system, the method comprising:

• receiving, from a relay node (RN), a first message used to establish a radio resource control (RRC) connection between the RN and the base station, the first message including an attach request and information indicating that the RRC connection is for a mobile RN, wherein the base station is connected to a network entity supporting the mobile RN;
• and
• transmitting, to the RN, a second message including an accept of the attach request with the network entity, the second message further including an IP address of the network entity, wherein an interface between the RN and the network entity is established based on the IP address of the network entity included in the second message, and
• wherein the IP address of the network entity is used as a destination address of a request message for establishing the interface.

A base station in a wireless communication system, the base station comprising:

• a transceiver configured to transmit and receive a signal;
• and
• a controller coupled with the transceiver and configured to:
• receive, from a relay node (RN), a first message used to establish a radio resource control (RRC) connection between the RN and the base station, the first message including an attach request and information indicating that the RRC connection is for a mobile RN, wherein the base station is connected to a network entity supporting the mobile RN, and
• transmit, to the RN, a second message including an accept of the attach request with the network entity, the second message further including an IP address of the network entity,
• wherein an interface between the RN and the network entity is established based on the IP address of the network entity included in the second message, and
• wherein the IP address of the network entity is used as a destination address of a request message for establishing the interface.