Deregistration with Context Retention for Inter-RAT Operations

• US 20110044307A1
• Filed: 07/20/2010
• Published: 02/24/2011
• Est. Priority Date: 08/24/2009
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Sharaga, Avishay, Taaghol, Pouya, Venkatachalam, Muthaiah, Mohanty, Shantidev
• Granted Patent: US 8,934,451 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: G08C 17/02 using a radio link
• CPC Class Codes: G08C 2201/41 Remote control of gateways
• CPC Class Codes: H04L 61/5014 using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
• CPC Class Codes: H04M 7/0069 comprising a residential gateway, e.g. those which provide an adapter for POTS or ISDN terminals
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 80/04 Network layer protocols, e.g. mobile IP [Internet Protocol]
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method to perform deregistration with context retention is presented. In one embodiment, the method includes storing a context associated with a mobile station in response to a deregistration request from the mobile station. The method includes determining whether or not to accept the deregistration request with context retention and sending a deregistration command message to the mobile station if the deregistration request with context retention is allowed.

Claims

1. A method comprising:

storing, in response to a deregistration request from a mobile station, a context associated with the mobile station;

determining whether or not to accept the deregistration request with context retention; and

sending a deregistration command message to the mobile station if the deregistration request with context retention is allowed.

2. The method of claim 1, further comprising:

propagating the context to be stored at a network entity; and

receiving an acknowledgement from the network entity that the context has been successfully stored.

3. The method of claim 1, further comprising sending a rejection if the deregistration request with context retention is not allowed.

4. The method of claim 1, wherein the context and the mobile station is associated with a context retention identifier (CRID).

5. The method of claim 1, wherein the deregistration request is received in a deregistration request message.

6. The method of claim 1, wherein the context comprises security keys, service flow parameters, and quality of service (QoS) parameters associated with a connection established by the mobile station.

7. The method of claim 1, wherein the context, in the format of one or more information elements, comprises service and operational information associated with a connection established by the mobile station.

8. The method of claim 1, further comprising saving the context for a first period of duration such that the mobile station is not required to respond to a paging message during the first period of duration, wherein the first period is extendable upon a request from the mobile station.

9. A method comprising:

retrieving, in response to a registration request, a context associated with a mobile station; and

sending one or more parameters in the context to the mobile station so that the mobile station proceeds with reentry.

10. The method of claim 9, wherein the registration request is sent in a ranging registration request.

11. The method of claim 9, further comprising:

determining which information in the context that are valid; and

performing a reentry process if part or all the information remains valid, such that latency for the reentry is shorter than it would be if the context was not retained.

12. The method of claim 9, further comprising receiving the context from a paging controller if the context is stored thereon.

13. The method of claim 9, further comprising generating a response to communicate one or more parameters which are valid to the mobile station, which are to be negotiated with the mobile station, or both.

14. The method of claim 9, wherein the mobile station reenters via a different base station within a same paging area.

15. A method comprising:

sending a deregistration request with an indication to perform context retention;

receiving a response indicative of an successful context retention; and

performing deregistration if the context retention is successful.

16. The method of claim 15, wherein the deregistration request is to be sent to a first network in response to a decision to establish a connection via another radio access technology (RAT) during inter-RAT operations.

17. The method of claim 15, wherein the deregistration request is to be sent to a first network, wherein a response to a paging message with respect to the first network is not longer required after the deregistration.

18. The method of claim 15, further comprising:

sending a reentry request, prior to disconnecting from the RAT;

receiving context information, propagated from a base station, based on information retained during the context retention; and

performing network entry based on the context information.

19. A network system comprising:

a processor;

a memory coupled to the processor; and

a communication device, coupled to the processor to

store, in response to a deregistration request from a mobile station, a context associated with the mobile station;

determine whether or not to accept the deregistration request with context retention;

propagate the context to be stored by a paging controller;

receive an acknowledgement from the paging controller that the context has been successfully stored; and

send a deregistration command message to the mobile station if the deregistration request with context retention is allowed.

20. The system of claim 19, wherein the system is operable to

retrieve, in response to a registration request, the context associated with the mobile station;

send one or more parameters in the context to the mobile station so that the mobile station proceeds with reentry; and

send a rejection response if the context is not available or has expired.