Discovery of controller function for wireless backhaul using cellular radio access technology

1. A method of wireless communications, comprising:

connecting to a parent relay that provides connectivity to a controller function (CF) of a network;

receiving, from the parent relay, information regarding at least one of: the CF or a radio access network (RAN) area covered by the CF;

obtaining an identifier of the CF using the information; and

connecting to the CF using the identifier.

2. The method of claim 1 , wherein the identifier is at least one of an internet protocol (IP) address or a medium access control (MAC) address.

3. The method of claim 1 , further comprising:

providing connectivity to the CF through the parent relay.

4. The method of claim 1 , wherein obtaining the identifier of the CF comprises:

establishing connectivity with a data network using a packet data unit (PDU) session;

connecting to a server using the PDU session;

transmitting the information that includes a RAN-area identifier to the server; and

receiving the identifier of the CF from the server based on the RAN-area identifier.

5. The method of claim 4 , wherein the server is an OAM server.

6. The method of claim 4 , wherein the RAN-area identifier is at least one of a parent relay identifier, a parent relay's CGI, a donor identifier, a donor's CGI, a RAN-notification identifier, or a tracking area identifier.

7. The method of claim 4 , wherein the RAN-area identifier is passed via RRC on at least one of a data radio bearer or in a NAS message.

8. The method of claim 4 , wherein the identifier of the CF is one of an IP address or an 802.3 address.

9. The method of claim 4 , further comprising:

configuring a second parent relay, and sending the RAN-area identifier to new relays through the second parent relay.

10. The method of claim 1 , wherein the information includes the identifier of the CF.

11. The method of claim 10 , wherein the identifier is passed via RRC on at least one of a data radio bearer or in a NAS message.

12. The method of claim 10 , wherein the identifier of the CF is one of an IP address or an 802.3 address.

13. The method of claim 10 , further comprising:

configuring a second parent relay, and sending the identifier of the CF to new relays via a DL RRC message by the second parent relay.

14. The method of claim 1 , wherein obtaining the identifier of the CF comprises:

establishing connectivity with a data network;

transmitting the information that includes a name of the CF to an address resolution server; and

receiving the identifier of the CF from the address resolution server based on the name of the CF.

15. The method of claim 1 , wherein obtaining the identifier of the CF comprises:

establishing connectivity with a data network;

transmitting the information that includes a name of the CF as a fully qualified domain name (FQDN) to a DNS server; and

receiving the identifier of the CF from the DNS server based on the FQDN.

16. The method of claim 14 , wherein the name of the CF is passed via RRC on at least one of a data radio bearer or in a NAS message.

17. The method of claim 14 , wherein the identifier of the CF is one of an IP address or an 802.3 address.

18. The method of claim 14 , further comprising:

configuring a second parent relay, and sending the name of the CF to new relays via a DL RRC message by a second base station.

19. The method of claim 1 , wherein obtaining the identifier of the CF comprises:

receiving a RAN-area identifier from the parent relay;

deriving a name of the CF based on the RAN-area identifier;

transmitting the name to an address resolution server; and

receiving the identifier of the CF from the address resolution server based on the name.

20. The method of claim 19 , wherein the RAN-area identifier is passed via RRC on at least one of a data radio bearer or in a NAS message.

21. The method of claim 19 , wherein the RAN-area identifier is at least one of a parent relay identifier, a parent relay's CGI, a donor identifier, a donor's CGI, a RAN-notification identifier, or a tracking area identifier.

22. The method of claim 19 , further comprising:

configuring a second parent relay, and sending the RAN-area identifier to new relays via a DL RRC message by the second parent relay.

23. The method of claim 1 , wherein obtaining the identifier of the CF comprises:

establishing connectivity with a data network using a packet data unit (PDU) session;

connecting to an OAM server using the PDU session;

transmitting the information that includes a RAN-area identifier to the OAM server;

receiving a name of the CF from the OAM server based on the RAN-area identifier;

transmitting the name to an address resolution server; and

receiving the identifier of the CF from the address resolution server based on the name of the CF.

24. The method of claim 1 , further comprising:

serving as a second parent relay to a new relay station that connects to this second parent relay.

25. An apparatus for wireless communication, comprising:

means for connecting to a parent relay that provides connectivity to a controller function (CF) of a network;

means for receiving, from the parent relay, information regarding at least one of: the CF or a radio access network (RAN) area covered by the CF;

means for obtaining an identifier of the CF using the information; and

means for connecting to the CF using the identifier.

26. An apparatus for wireless communication, comprising:

at least one processor configured to:

control connection to a parent relay that provides connectivity to a controller function (CF) of a network;

receive, from the parent relay, information regarding at least one of: the CF or a radio access network (RAN) area covered by the CF;

obtain an identifier of the CF using the information; and

control connection to the CF using the identifier; and

a memory coupled to the at least one processor.

27. A non-transitory computer-readable medium for wireless communications having instructions stored thereon for:

connecting to a parent relay that provides connectivity to a controller function (CF) of a network;

receiving, from the parent relay, information regarding at least one of: the CF or a radio access network (RAN) area covered by the CF;

obtaining an identifier of the CF using the information; and

connecting to the CF using the identifier.