US 10,383,163 B2 · Enhancements to terminating access domain selection

Abstract

A method of determining in an IP multimedia subsystem, IMS, network which radio access type, RAT, should be used to route a terminating session directed towards a user equipment, UE. The HSS receives a terminating access domain selection, T-ADS, query from an application server, AS, of the IMS network, the T-ADS query relating to the terminating session and identifying the UE; and determines whether a packet data network gateway, PDN-GW, is registered for the UE. In the case where a PDN-GW is registered, the HSS sends a RAT request towards the PDN-GW, the RAT request identifying the UE and requesting a RAT used by the UE to connect to the IMS network. The PDN-GW determines the RAT and sends the result towards the HSS, which sends a T-ADS response to the AS indicating the RAT. In the case where a PDN-GW is not registered, the HSS sends a T-ADS response to the AS indicating that the RAT is a circuit switched RAT. Apparatus for implementing the method are also provided.

Claims11

Dependent claims

receiving at a home subscriber server, HSS, a terminating access domain selection, T-ADS, query from an application server, AS, of the IMS network, the T-ADS query relating to the terminating session and identifying the UE;
and
determining whether a packet data network gateway, PDN-GW, is registered for the UE;
in the case where a PDN-GW is registered:
sending a RAT request from the HSS towards the PDN-GW, the RAT request identifying the UE and requesting a RAT used by the UE to connect to the IMS network;
determining the RAT at the PDN-GW;
and sending the result towards the HSS;
and
sending a T-ADS response from the HSS to the AS indicating the RAT;
in the case where a PDN-GW is not registered:
sending a T-ADS response from the HSS to the AS indicating that the RAT is a circuit switched RAT.

8 more elements

An apparatus configured to operate as a home subscriber server, HSS, in an IP multimedia subsystem, IMS, network, the apparatus comprising:

a first transceiver configured to communicate with an application server, AS, of the IMS;
a second transceiver configured to communicate with a packet data network gateway, PDN-GW;
and
a terminating access domain selection, T-ADS, processor configured to:
receive, via the first transceiver, a T-ADS query from the AS, the T-ADS query relating to a terminating session and identifying a user equipment, UE;
and
determine whether the PDN-GW is registered for the UE;
in the case where the PDN-GW is registered:
send, via the second transceiver, a radio access type, RAT, request towards the PDN-GW, the request identifying the UE and requesting a RAT used by the UE to connect to the IMS network;
receive, via the second transceiver, a result indicating the RAT from the PDN-GW;
and
send, via the first transceiver, a T-ADS response to the AS indicating the RAT;
in the case where the PDN-GW is not registered:
send, via the first transceiver, a T-ADS response to the AS indicating that the RAT is a circuit switched RAT.

11 more elements

Dependencies are inferred from the claim text.

Enhancements to terminating access domain selection

Life of this patent

Enhancements to terminating access domain selection

Life of this patent

Abstract

Claims11