Apparatus, and an associated method, for facilitating fast transition in a network system

• US 8,081,759 B2
• Filed: 09/15/2005
• Issued: 12/20/2011
• Est. Priority Date: 09/15/2004
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Faccin, Stefano, Edney, Jonathan P.
• Primary Examiner(s): Zee, Edward
• Assistant Examiner(s): NGUY, CHI D
• Application Number:
  US11/229,338
• Publication Number:
  US 20060067526A1
• Time in Patent Office: 2,287 Days
• Field of Search: 380/46, 380/263, 380/268, 380/272, 380/273, 380247-249, 455/432.1, 455/436, 455/411, 455/437, 713/168
• US Class Current: 380/273
• CPC Class Codes: H04L 2209/80 Wireless
• CPC Class Codes: H04L 63/083 using passwords cryptographic mechanisms or cryptographic arrangements for entity authentication using a predetermined code H04L9/3226
• CPC Class Codes: H04L 63/123 received data contents, e.g. message integrity
• CPC Class Codes: H04L 9/0844 with user authentication or key authentication, e.g. ElGamal, MTI, MQV-Menezes-Qu-Vanstone protocol or Diffie-Hellman protocols using implicitly-certified keys
• CPC Class Codes: H04W 12/062 Pre-authentication
• CPC Class Codes: H04W 36/0016 Hand-off preparation specially adapted for end-to-end data sessions
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

An apparatus, system, computer-readable medium, and method to facilitate quick transition of communications of a mobile station between network stations of a radio communication system, such as a WLAN operable to a variant of an IEEE 802 operating specification, is provided. Implementations of embodiments described herein reduce the transition duration by a pre-keying mechanism that performs authentication procedures prior to commencement of reassociation procedures. In other embodiments, a mobile station is allowed to select whether to perform pre-keying processes over an air interface with a target transition access point or whether to perform the pre-keying processes over a distribution system.

Claims

1. A method comprising:

discovering, by a mobile device, a second access point while communicatively associated with a first access point;

obtaining a first pseudo-random value and a second pseudo-random value, wherein at least one of the first pseudo-random value and the second pseudo-random value is provided by the second access point;

generating a data structure that defines a resource request for a fast transition in a pre-keying process, wherein the first pseudo-random value and the second pseudo-random value are included in the data structure, wherein the resource request relates to whether the second access point has capabilities and resources to support needs of the mobile device;

transmitting the data structure to the second access point in the pre-keying process;

determining, after the pre-keying process is completed, whether to invoke a reassociation procedure based on a first resource response to the data structure, wherein the first resource response indicates whether the second access point has the capabilities and resources to support the needs of the mobile device.

2. The method of claim 1, further comprising calculating a first key based on the second pseudo-random value and a third pseudo-random value read from the first resource response.

3. The method of claim 2, further comprising:

generating a reassociation request subsequent to calculation of the first key, wherein the reassociation request includes a value derived from the third pseudo-random value; and

transmitting the reassociation request to the second access point.

4. The method of claim 3, wherein the value derived from the third pseudo-random value comprises a hash of the third pseudo-random value.

5. The method of claim 2, wherein the first pseudo-random value comprises a supplicant transition nonce value, and wherein the second pseudo-random value comprises an authentication transition nonce value.

6. The method of claim 1, further comprising:

receiving a reassociation response message in response to an reassociation request; and

verifying that the second access point has a current key based on contents of the reassociation response message.

7. The method of claim 1, further comprising selecting performance of the pre-keying process through over the air communications or via a distribution system.

8. A method comprising:

receiving, by a second access point, a data structure that defines a resource request for a fast transition in a pre-keying process, wherein a first pseudo-random value and a second pseudo-random value are included in the data structure, wherein at least one of the first pseudo-random value and the second pseudo-random value is provided by the second access point, wherein the resource request relates to whether the second access point has capabilities and resources to support needs of a mobile station;

generating a resource response which indicates whether the second access point has the capabilities and resources to support the needs of the mobile station in the pre-keying process;

transmitting the resource response to the mobile station; and

after the pre-keying process is completed, receiving a reassociation request from the mobile station.

9. The method of claim 8, further comprising:

receiving a reassociation request that includes a value derived from a third pseudo-random value; and

verifying that the mobile station has a current key based on the value derived from the third pseudo-random value, wherein the value derived from the third pseudo-random value comprises a hash of the third pseudo-random value.

10. A non-transitory computer-readable medium having computer-executable instructions for execution by a processing system, the computer-executable instructions for facilitating a fast transition in a network system, comprising:

instructions to discover a second access point while communicatively associated with a first access point;

instructions to obtain a first pseudo-random value and a second pseudo-random value, wherein at least one of the first pseudo-random value and the second pseudo-random value is provided by the second access point;

instructions to generate a data structure that defines a resource request for a fast transition in a pre-keying process, wherein the first pseudo-random value and the second pseudo-random value are included in the data structure, wherein the resource request relates to whether the second access point has capabilities and resources to support needs of the mobile device;

instructions to generate the data structure to the access point in the pre-keying process;

instructions to determine, after the pre-keying process is completed, whether to invoke a reassociation procedure with the access point based on a first resource response to the data structure, wherein the resource response message indicates whether the second access point has the capabilities and resources to support the needs of the mobile device.

11. The non-transitory computer-readable medium of claim 10, further comprising instructions to calculate a key based on the second pseudo-random value and a third pseudo-random value read from the first resource response.

12. The non-transitory computer-readable medium of claim 11, further comprising:

instructions to generate a reassociation request subsequent to calculation of the key, wherein the reassociation request includes a value derived from the third pseudo-random value; and

instructions to transmit the reassociation request to the second access point.

13. The non-transitory computer-readable medium of claim 12, wherein the value derived from the third pseudo-random value comprises a hash of the third pseudo-random value.

14. The non-transitory computer-readable medium of claim 12, further comprising:

instructions to receive a reassociation response message; and

instructions to verify the second access point has a current key based on contents of the reassociation response message.

15. The non-transitory computer-readable medium of claim 12, wherein the first pseudo-random value comprises a supplicant transition nonce value, and wherein the second pseudo-random value comprises an authentication transition nonce value.

16. The non-transitory computer-readable medium of claim 10, further comprising instructions that release a radio link with the first access point subsequent to a determination being made to invoke a reassociation procedure.

17. A non-transitory computer-readable medium having computer-executable instructions for execution by a processing system, the computer-executable instructions for facilitating a fast transition in a network system, comprising:

instructions to receive a data structure that defines a resource request for a fast transition in a pre-keying process, wherein a first pseudo-random value and a second pseudo-random value are included in the data structure, wherein the resource request relates to whether a second access point has capabilities and resources to support needs of a mobile station associated with a first access point, wherein at least one of the first pseudo-random value and second pseudo-random value is provided by the second access point;

instructions to generate a resource response, in the pre-keying process, which indicates whether the second access point has the capabilities and resources to support needs of the mobile station;

instructions to transmit the resource response to the mobile station; and

instructions to receive, after the pre-keying process is completed, a reassociation request from the mobile station.

18. The non-transitory computer-readable medium of claim 17, further comprising:

instructions to receive a reassociation request that includes a value derived from a third pseudo-random value; and

instructions to verify that the mobile station has a current key based on the value derived from the third pseudo-random key.

19. An apparatus comprising:

a transmitter;

a receiver;

a processor configured to communicate with an access point through the transmitter and the receiver; and

a memory configured to store computer-executable instructions for execution by the processor, the computer-executable instructions for facilitating a fast transition in a network system,

the processor is configured to discover a second access point while communicatively associated with a first access point, obtain a first pseudo-random value and a second pseudo-random value, wherein at least one of the first pseudo-random value and second pseudo-random value is provided by the second access point, and generate a data structure that defines a resource request for a fast transition in a pre-keying process, wherein the first pseudo-random value and the second pseudo-random value are included in the data structure, wherein the resource request relates to whether the second access point has capabilities and resources to support needs of the apparatus,

the transmitter is configured to transmit the data structure to the access point in the pre-keying process,

the processor is configured to determine, after the pre-keying process is completed, whether to invoke a reassociation procedure with the second access point based on a first resource response to the data structure, wherein the first resource response indicates whether the second access point has the capabilities and resources to support the needs of the apparatus.

20. The apparatus of claim 19, the processor further configured to calculate a key based on the second pseudo-random value and a third pseudo-random value read from the first resource response.

21. The apparatus of claim 19, the memory further configured to store instructions that, when executed by the processor, release a radio link with the first access point subsequent to a determination being made to invoke a reassociation procedure.

22. The apparatus of claim 19, wherein the first resource response comprises a reassociation deadline for initiating the reassociation procedure by said apparatus.

23. An apparatus comprising:

a transmitter;

a receiver;

a processor configured to communicate with a mobile station through the transmitter and the receiver, the processor configured to obtain a first pseudo-random value and a second pseudo-random value; and

a memory configured to store computer-executable instructions for execution by the processor, the computer-executable instructions for facilitating a fast transition in a network system,

the processor is configured to receive through the receiver a data structure that defines a resource request for a fast transition in a pre-keying process, wherein the data structure includes the first pseudo-random value and the second pseudo-random value, wherein at least one of the first pseudo-random value and second pseudo-random value is provided by the apparatus, wherein the resource request relates to whether the apparatus has capabilities and resources to support needs of the mobile station communicatively associated with a first access point;

generate a resource response which indicates whether the apparatus has the capabilities and resources to support the needs of the mobile station,

the transmitter is configured to transmit the resource response to the mobile station in the pre-keying process, and

the receiver is configured, after the pre-keying process is completed, to receive a reassociation request from the mobile station.

24. The apparatus of claim 23, wherein the processor is further configured to receive a reassociation request that includes a value derived from a third pseudo-random value and verify that the apparatus has a current key based on the value derived from the third pseudo-random key.

25. The apparatus of claim 24, wherein the value derived from the third pseudo-random value comprises a hash of the third pseudo-random value.)

26. The apparatus of claim 23, wherein the resource response comprises a reassociation deadline for initiating the reassociation procedure by said mobile station.