Method and apparatus for obtaining internet protocol address of a base station in a wireless communication system

A method performed by a wireless access backhaul-mobile terminal (WAB-MT) in a wireless communication system, the method comprising:

• transmitting first information and fourth information to a first node, wherein the first information comprises at least one of information indicating that the WAB-MT is a WAB node or a WAB-MT, an identification of a co-located WAB-gNB of the WAB-MT, a request for an Internet Protocol (IP) address of the first node, and the fourth information comprises a request for an IP address of a neighbor node of the first node;
• and
• receiving second information and fifth information from the first node, wherein the second information comprises the IP address of the first node, and the fifth information comprises the IP address of the neighbor node of the first node,
• wherein the IP address is used for the co-located WAB-gNB of the WAB-MT to transmit an Xn setup request to the first node, and
• wherein the IP address of the neighbor node is used for the co-located WAB-gNB of the WAB-MT to transmit an Xn setup request to the neighbor node.

A method performed by a UE in a wireless communication system, the method comprising:

• receiving a radio resource control (RRC) reconfiguration message from a WAB-gNB;
• and
• transmitting an RRC reconfiguration complete message to a first node,
• wherein first and fourth information are transmitted from a co-located wireless access backhaul-mobile terminal (WAB-MT) of the WAB-gNB to the first node, wherein the first information comprises at least one of information indicating that the WAB-MT is a WAB node or a WAB-MT, an identification of the WAB-gNB, a request for an Internet Protocol (IP) address of the first node, and the fourth information comprises a request for an IP address of a neighbor node of the first node,
• wherein second information and fifth information are transmitted from the first node to the WAB-MT, wherein the second information comprises the IP address of the first node and the fifth information comprises the IP address of the neighbor node of the first node,
• wherein the IP address is used for the WAB-gNB to transmit an Xn setup request to the first node, and
• wherein the IP address of the neighbor node is used for the co-located WAB-gNB to transmit an Xn setup request to the neighbor node.

A node device in a wireless communication system, the node device comprising:

• at least one transceiver;
• at least one processor communicatively coupled to the at least one transceiver;
• and
• at least one memory, communicatively coupled to the processor, configured for storing instructions executable by the processor individually or in any combination to cause the node device to:
• receive first information and fourth information from a wireless access backhaul-mobile terminal (WAB-MT), wherein the first information comprises at least one of information indicating that the WAB-MT is a WAB node or a WAB-MT, an identification of a co-located WAB-gNB of the WAB-MT, a request for an Internet Protocol (IP) address of the node device, and the fourth information comprises a request for an IP address of a neighbor node of the node device, and
• transmit second information and fifth information to the WAB-MT, wherein the second information comprises the IP address of the node device, and the fifth information comprises the IP address of the neighbor node of the node device,
• wherein the IP address is used for the co-located WAB-gNB of the WAB-MT to transmit an Xn setup request to the node device, and
• wherein the IP address of the neighbor node is used for the co-located WAB-gNB of the WAB-MT to transmit an Xn setup request to the neighbor node.

A wireless access backhaul-mobile terminal (WAB-MT) in a wireless communication system, comprising:

• at least one transceiver;
• at least one processor communicatively coupled to the at least one transceiver;
• and
• at least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor individually or in any combination to cause the WAB-MT to:
• transmit first information and fourth information to a first node, wherein the first information comprises at least one of:
• information indicating that the WAB-MT is a WAB node or a WAB-MT, an identification of a co-located WAB-gNB of the WAB-MT, a request for an Internet Protocol (IP) address of the first node, and the fourth information comprises a request for an IP address of a neighbor node of the first node, and
• receive second information and fifth information from the first node, wherein the second information comprises the IP address of the first node, and the fifth information comprises the IP address of the neighbor node of the first node,
• wherein the IP address is used for the co-located WAB-gNB of the WAB-MT to transmit an Xn setup request to the first node, and
• wherein the IP address of the neighbor node is used for the co-located WAB-gNB of the WAB-MT to transmit an Xn setup request to the neighbor node.

A UE in a wireless communication system, comprising:

• at least one transceiver;
• at least one processor communicatively coupled to the at least one transceiver;
• and
• at least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor individually or in any combination to cause the UE to:
• receive a radio resource control (RRC) reconfiguration message from a WAB-gNB, and
• transmit an RRC reconfiguration complete message to a first node,
• wherein first and fourth information are transmitted from a co-located wireless access backhaul-mobile terminal (WAB-MT) of the WAB-gNB to the first node, wherein the first information comprises at least one of:
• information indicating that the WAB-MT is a WAB node or a WAB-MT, an identification of the WAB-gNB, a request for an Internet Protocol (IP) address of the first node, and the fourth information comprises a request for an IP address of a neighbor node of the first node,
• wherein second information and fifth information are transmitted from the first node to the WAB-MT, wherein the second information comprises the IP address of the first node and the fifth information comprises the IP address of the neighbor node of the first node,
• wherein the IP address is used for the WAB-gNB to transmit an Xn setup request to the first node, and
• wherein the IP address of the neighbor node is used for the co-located WAB-gNB to transmit an Xn setup request to the neighbor node.