System and method for routing an incoming call to a proper domain in a network environment including IMS

• US 8,521,170 B2
• Filed: 01/09/2007
• Issued: 08/27/2013
• Est. Priority Date: 01/10/2006
• Status: Expired due to Fees

• Current Assignee: Blackberry Limited
• Original Assignee: Research In Motion Limited (Blackberry Limited)
• Inventors: Buckley, Adrian, Allen, Andrew, Shenfield, Michael
• Primary Examiner(s): Kim, Wesley
• Assistant Examiner(s): NGUYEN, DINH
• Application Number:
  US11/651,251
• Publication Number:
  US 20070238467A1
• Time in Patent Office: 2,422 Days
• Field of Search: 455/445, 455/422.1, 455/560, 455/435.1, 455/456.1, 455/456.5, 455/456.6, 370/328, 370/329, 370/330, 370/331, 370/332
• US Class Current: 455/445
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1095 Inter-network session transfer or sharing
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04L 67/54 Presence management, e.g. monitoring or registration for receipt of user log-on information, or the connection status of the users
• CPC Class Codes: H04L 69/28 Timers or timing mechanisms used in protocols
• CPC Class Codes: H04M 3/42289 with carrierprovider selection by subscriber
• CPC Class Codes: H04M 7/0057 Services where the data services network provides a telephone service in addition or as an alternative, e.g. for backup purposes, to the telephone service provided by the telephone services network
• CPC Class Codes: H04Q 3/0045 involving hybrid, i.e. a mixture of public and private, or multi-vendor systems
• CPC Class Codes: H04W 36/00226 wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 76/12 Setup of transport tunnels
• CPC Class Codes: H04W 76/20 Manipulation of established connections
• CPC Class Codes: H04W 8/02 Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
• CPC Class Codes: H04W 8/18 Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
• CPC Class Codes: H04W 8/22 Processing or transfer of terminal data, e.g. status or physical capabilities
• CPC Class Codes: H04W 80/04 Network layer protocols, e.g. mobile IP [Internet Protocol]
• CPC Class Codes: H04W 80/10 adapted for application session management, e.g. SIP [Session Initiation Protocol] connection management H04W76/00; arrangements for session management H04L67/14

Abstract

In one embodiment, a scheme is disclosed for routing an incoming call in a network environment including a circuit-switched (CS) network and an IP multimedia subsystem (IMS) network, wherein the incoming call is being directed to a user equipment (UE) device disposed in the network environment. A network node disposed in the IMS network is operable to perform a number of determinations with respect to the UE device'"'"'s domain, state, applicability of user and/or operator policies and preferences, location, et cetera. The incoming call is terminated to an appropriate domain (e.g., CS domain or IMS domain) based at least in part upon the foregoing determinations.

Claims

1. A method, practiced by a Network Domain Selection (NeDS) network entity in an Internet Protocol (IP) multimedia subsystem (IMS), of routing an incoming call, comprising:

receiving a message from a Home Subscriber Server (HSS), the message being a notification message generated to inform the NeDS network entity, wherein the message indicates that a User Equipment (UE) has attached to a network;

starting a timer upon receipt of the message, the timer having a pre-determined expiry period, wherein the NeDS network entity determines that the UE supports a given IMS service if a third party registration message is received before the timer reaches its predetermined expiry period; and

on receiving the incoming call, consulting a database to determine a terminating network, wherein the terminating network supports the given IMS service if the NeDS network entity has determined that the UE supports the given IMS service.

2. The method of claim 1 further comprising terminating the incoming call to a domain based on the determinations, wherein the determinations are effectuated at a network node associated with an IMS network.

3. The method of claim 1 wherein the database is a wireless access network database.

4. The method of claim 1 wherein the database is located in a Global System for Mobile Communications (GSM) Home Subscriber Service (HSS).

5. The method of claim 1 wherein the database is located in the NeDS network entity.

6. The method of claim 1 wherein a database entry indicates at least one of the attach state of a U E and the PDP activation state of a UE and wherein the database entry is made based on operation of a presence user agent.

7. The method of claim 1 wherein the given IMS service is Voice Call Continuity (VCC).

8. The method of claim 1 further comprising informing the UE device to switch to another network that supports the given IMS service if a current network on which the UE device is registered does not support the given IMS service.

9. The method of claim 1 further comprising informing the UE device that the given IMS service will not be performed if no network is found that supports the given IMS service.

10. The method of claim 1 further comprising determining whether an IMS service is to be invoked with respect to the incoming call.

11. The method of claim 1 wherein the incoming call is terminated to a CS domain based on the determinations.

12. The method of claim 1 wherein the incoming call is terminated to an IMS domain based on the determinations.

13. The method of claim 1 further including determining where the UE device is located.

14. A Network Domain Selection (NeDS) network node in an Internet Protocol (IP) multimedia subsystem (IMS) network, comprising:

an interface for communicating with a database;

a component configured to receive a message from a Home Subscriber Server (HSS), the message being a notification message generated to inform the NeDS network entity, wherein the message indicates that a User Equipment (UE) has attached to a network;

a component configured to start a timer upon receipt of the message, the timer having a pre-determined expiry period, wherein the NeDS network entity determines that the UE supports a given IMS service if a third party registration message is received before the timer reaches its predetermined expiry period; and

a component configured, on receiving the incoming call, to consult a database to determine a terminating network, wherein the terminating network supports the given IMS service if the NeDS network entity has determined that the UE supports the given IMS service, the components comprising one of firmware and software stored in a non-transitory storage.

15. The network node of claim 14 further comprising a component configured to terminate the incoming call to a domain based on the determinations, wherein the determinations are effectuated at a network node associated with an IMS network.

16. The network node of claim 14 wherein the database is a wireless access network database.

17. The network node of claim 14 wherein the database is located in a Global System for Mobile Communications (GSM) Home Subscriber Service (HSS).

18. The network node of claim 14 wherein the database is located in the NeDS network entity.

19. The network node of claim 14 wherein a database entry indicates at least one of the attach state of a UE and the PDP activation state of a UE and wherein the database entry is made based on operation of a presence user agent.

20. The network node of claim 14 wherein the given IMS service is Voice Call Continuity (VCC).

21. The network node of claim 14 further comprising a component configured to inform the UE device to switch to another network that supports the IMS service if a current network on which the UE device is registered does not support the given IMS service.

22. The network node of claim 14 further comprising a component configured to inform the UE device that the given IMS service will not be performed if no network is found that supports the given IMS service.