Methods, apparatus, and computer-readable media for discovery of application server and/or services for V2X communications
Embodiments include methods performed by a V2X user equipment (UE) for service discovery from a V2X application server (AS). Such methods include sending, to a first address associated with the V2X AS, a first request for further address information associated with the V2X AS. Such methods include receiving, from the first address via unicast signaling, a first response including the requested further address information, which facilitates UE discovery of V2X services available via unicast communication between the V2X UE and a radio access network (RAN). Other embodiments include complementary methods performed by a V2X AS, as well as V2X UE and V2X AS apparatus configured to perform such methods.
1. A method performed by a V2X user equipment (UE) for service discovery from a V2X application server (AS), the method comprising:
sending, to a first address associated with the V2X AS, a first discovery request for further address information associated with the V2X AS; and
receiving, from the first address via unicast signaling, a first discovery response including the requested further address information, which facilitates UE discovery of V2X services available via unicast communication between the V2X UE and a radio access network (RAN).
2. The method of claim 1 , wherein the first discovery request is sent, and the first discovery response is received, via a Third-Generation Partnership Project (3GPP)-specified V1 interface between the V2X UE and the V2X AS.
3. The method of claim 1 , wherein one or more of the following applies:
the first address is an address of a configuration management server of the V2X AS; and
the first address is pre-configured in the V2X UE.
4. The method of claim 1 , wherein the first discovery request includes an identifier of the V 2 X UE but the first discovery response does not include the identifier of the V 2 X UE.
5. The method of claim 1 , wherein the further address information associated with the V2X AS comprises one or more of the following:
a transport port;
one or more fully-qualified domain names (FQDNs);
one or more Internet Protocol (IP) addresses;
an identifier of an associated geographical area; and
identifiers of one or more associated public land mobile networks (PLMNs).
6. The method of claim 1 , further comprising:
sending, to the further address information associated with the V2X AS, a second discovery request for V2X services available via unicast communication; and
receiving, from the V2X AS in response the second discovery request, a second discovery response comprising:
identification of one or more V2X services available via unicast communication between the V2X UE and the RAN; and
information mapping the identified services to the further address information received in the first response.
7. The method of claim 6 , wherein the second discovery request includes one or more of the following: an identifier of the V2X UE, and one or more filtering criteria for services of interest to the V2X UE.
8. The method of claim 6 , wherein:
the V2X UE includes a configuration management client and a V2X application enabler (VAE) client;
the configuration management client sends the first discovery request and receives the first discovery response; and
the VAE client sends the second discovery request and receives the second discovery response.
9. The method of claim 6 , wherein the identification of the one or more V2X services includes identification of respective protocol versions of the one or more V2X services.
10. The method of claim 6 , further comprising receiving, from the V2X AS, a subsequent message comprising updates related to one or more of the following:
the one or more services identified in the further message; and
one or more further services associated with the V2X AS but not identified in the further message,
wherein the subsequent message is received via one of the following: unicast from the RAN, broadcast via the RAN, or broadcast from another V2X UE.
11. A method performed by a V2X application server (AS) for facilitating service discovery by one or more V2X user equipment (UE), the method comprising:
receiving, at a first address associated with the V2X AS, a first discovery request from a V2X UE for further address information associated with the V2X AS; and
sending, from the first address to the V2X UE via unicast signaling, a first discovery response comprising the requested further address information, which facilitates UE discovery of V2X services available via unicast communication between the V2X UE and a radio access network (RAN).
12. The method of claim 11 , wherein the first discovery request is received, and the first discovery response is sent, via a Third-Generation Partnership Project (3GPP)-specified V1 interface between the V2X UE and the V2X AS.
13. The method of claim 11 , wherein one or more of the following applies:
the first address is an address of a configuration management server of the V2X AS; and
the first address is pre-configured in the V2X UE.
14. The method of claim 11 , wherein the first discovery request includes an identifier of the V2X UE but the first discovery response does not include the identifier of the V2X UE.
15. The method of claim 11 , wherein the further address information associated with the V2X AS comprises one or more of the following:
a transport port;
one or more fully-qualified domain names (FQDNs);
one or more Internet Protocol (IP) addresses;
an identifier of an associated geographical area; and
identifiers of one or more associated public land mobile networks (PLMNs).
16. The method of claim 11 , further comprising:
receiving, at the further address information associated with the V2X AS, a second discovery request from the UE for V2X services available via unicast communication; and
sending, to the V2X UE in response the second discovery request, a second discovery response comprising:
identification of one or more V2X services available via unicast communication between the V2X UE and the RAN; and
information mapping the identified services to the further address information received in the first response.
17. The method of claim 16 , wherein the second discovery request includes one or more of the following: an identifier of the V2X UE, and one or more filtering criteria for services of interest to the V2X UE.
18. The method of claim 16 , wherein:
the V2X AS includes a configuration management server and a V2X application enabler (VAE) server;
the configuration management server receives the first discovery request and sends the first discovery response; and
the VAE server receives the second discovery request and sends the second discovery response.
19. The method of claim 16 , wherein the identification of the one or more V2X services includes identification of respective protocol versions of the one or more V2X services.
20. The method of claim 16 , further comprising sending, to the V2X UE, a subsequent message comprising updates related to one or more of the following:
the one or more services identified in the further message; and
one or more further services associated with the V2X AS but not identified in the further message,
wherein the subsequent message is sent via one of the following: unicast from the RAN, broadcast from the RAN, or broadcast from another V2X UE.
21. A V2X user equipment (UE) configured for service discovery from a V2X application server (AS), the V2X UE comprising:
transceiver circuitry configured to communicate with the V2X AS via a radio access network, RAN; and
processing circuitry operably coupled to the transceiver circuitry, wherein the processing circuitry and the transceiver circuitry are configured to perform operations corresponding to the method of claim 1 .
22. A V2X application server (AS) configured to facilitate service discovery by one or more V2X user equipment (UE), the V2X AS comprising:
network interface circuitry configured to communicate with the one or more V2X UEs via a radio access network (RAN); and
processing circuitry operably coupled to the network interface circuitry, wherein the processing circuitry and the transceiver circuitry are configured to perform operations corresponding to the method of claim 11 .