Internet protocol (IP) address assignment in integrated access backhaul (IAB) networks
Embodiments include methods and/or procedures performed by an integrated access backhaul, IAB, node of a radio access network, RAN, that is associated with a core network, CN. Such embodiments include performing a registration with a CN node, and establishing a secure connection with a RAN node. Such embodiments also include receiving, from the RAN node via the secure connection, configuration information for one or more radio bearers between the IAB node and the RAN node. The radio bearers are adapted for backhaul of control plane information and/or user plane information. Such embodiments also include establishing, with the RAN node via at least one of the radio bearers, one or more Internet Protocol addresses usable by the IAB node. Other embodiments include complementary methods and/or procedures performed by CN nodes and RAN nodes, as well as network nodes configured to perform the various methods and/or procedures.
1. A method performed by an integrated access backhaul (IAB) node of a radio access network (RAN) associated with a core network (CN), the method comprising:
performing a registration with a CN node;
establishing a secure connection with a centralized unit (CU) of a RAN node;
receiving, from the CU of the RAN node via the secure connection, configuration information for one or more radio bearers between the IAB node and the RAN node, wherein the one or more radio bearers are adapted for backhaul of at least one of the following: control plane information, or user plane information; and
establishing, with a distributed unit (DU) of the RAN node via at least one of the one or more radio bearers, one or more Internet Protocol (IP) addresses usable by the IAB node.
2. The method of claim 1 , wherein the one or more radio bearers are associated with an adaptation layer between the IAB node and the RAN node.
3. The method of claim 1 , wherein performing the registration with the CN node comprises sending the CN node one of the following: an identifier of the IAB node, or information that distinguishes the IAB node from a user equipment (UE).
4. The method of claim 1 , wherein a packet data connection and protocol data unit resources are neither requested nor setup during the registration.
5. The method of claim 1 , wherein establishing the one or more IP addresses comprises:
receiving a Router Advertisement message via one of the one or more radio bearers; and
determining the one or more IP addresses based on the content of the Router Advertisement message.
6. The method of claim 5 , wherein establishing the one or more IP addresses further comprises sending an indication of the one or more IP addresses via a Neighbor Discovery Protocol (NDP) message to the RAN node via one of the one or more radio bearers.
7. The method of claim 1 , wherein establishing the one or more IP addresses comprises receiving the one or more IP addresses from the RAN node via one of the following:
Radio Resource Control (RRC) protocol;
an adaptation layer protocol;
Dynamic Host Configuration Protocol (DHCP); or
Address Resolution Protocol (ARP).
8. The method of claim 1 , wherein establishing the one or more IP addresses comprises:
sending a request for at least one IP address via one of the one or more radio bearers, wherein the request is one of the following:
a Dynamic Host Configuration Protocol (DHCP) request,
a Neighbor Discovery Protocol (NDP) message,
an Internet Router Discovery Protocol (IRDP) message, or
a request comprising an adaptation layer procedure; and
receiving the one or more IP addresses in response to the request.
9. The method of claim 1 , wherein the one or more IP addresses comprise a plurality of IP addresses, each IP address associated with a different backhaul bearer or with a different quality of service (QoS) class.
10. The method of claim 1 , wherein establishing the secure connection comprises:
receiving a security mode command from the RAN node;
deriving security keys for the secure connection; and
sending a security mode complete message to the RAN node.
11. An integrated access backhaul (IAB) node configured for operation in a radio access network (RAN) of a wireless communication network that includes a core network (CN), the TAB node comprising:
communication interface circuitry configured to communicate with one or more RAN nodes and with one or more user equipment; and
processing circuitry operably coupled with the communication interface circuitry, wherein the communication interface circuitry and the processing circuitry are configured to perform operations corresponding to the method of claim 1 .
12. A method performed by a node, in radio access network (RAN) associated with a core network (CN), for configuring an integrated access backhaul (IAB) node of the RAN, the method comprising:
receiving, by a centralized unit (CU) of the RAN node, context information for the IAB node from a CN node, wherein the context information includes information distinguishing the IAB node from a user equipment (UE);
establishing, by the CU, a secure connection with the IAB node;
sending, by the CU to the IAB node via the secure connection, configuration information for one or more radio bearers adapted for backhaul of at least one of the following: control plane information, or user plane information; and
establishing, by a distributed unit (DU) of the RAN node with the IAB node via at least one of the one or more radio bearers, one or more Internet Protocol (IP) addresses usable by the IAB node.
13. The method of claim 12 , wherein the context for the IAB node excludes a default radio bearer configuration.
14. The method of claim 12 , wherein the one or more radio bearers are associated with an adaptation layer between the IAB node and one or more other RAN nodes.
15. The method of claim 12 , wherein establishing the one or more IP addresses comprises sending a Router Advertisement message to the IAB node via one of the one or more radio bearers.
16. The method of claim 15 , wherein establishing the one or more IP addresses further comprises receiving an indication of the one or more IP addresses via a Neighbor Discovery Protocol (NDP) message from the IAB node via one of the one or more radio bearers.
17. The method of claim 12 , wherein establishing the one or more IP addresses comprises sending the one or more IP addresses to the IAB node via one of the following:
Radio Resource Control (RRC) protocol;
an adaptation layer protocol;
Dynamic Host Configuration Protocol (DHCP); or
Address Resolution Protocol (ARP).
18. The method of claim 12 , wherein establishing the one or more IP addresses comprises:
receiving a request for at least one IP address via one of the one or more radio bearers, wherein the request is one of the following:
a Dynamic Host Configuration Protocol (DHCP) request,
a Neighbor Discovery Protocol (NDP) message,
an Internet Router Discovery Protocol (IRDP) message, or
a request comprising an adaption layer procedure; and
sending the one or more IP addresses in response to the request.
19. A network node configured for operation in a radio access network (RAN) of a wireless communication network that includes a core network (CN), the network node comprising:
communication interface circuitry configured to communicate with one or more integrated access backhaul (IAB) nodes, with one or more user equipment, and with one or more CN nodes; and
processing circuitry operably coupled with the communication interface circuitry, wherein the communication interface circuitry and the processing circuitry are configured to perform operations corresponding to the method of claim 12 .