Method and apparatus for providing non-packet switched service in a target radio access technology network

• US 8,547,969 B2
• Filed: 03/23/2010
• Issued: 10/01/2013
• Est. Priority Date: 03/31/2009
• Status: Expired due to Fees

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Watfa, Mahmoud, Aghili, Behrouz, Wang, Peter S., Olvera-Hernandez, Ulises, Somasundaram, Shankar
• Primary Examiner(s): Vu, Huy D
• Assistant Examiner(s): HALL, TEISHA DANEA
• Application Number:
  US12/729,775
• Publication Number:
  US 20100296421A1
• Time in Patent Office: 1,288 Days
• Field of Search: 370/353, 370/354, 370/355
• US Class Current: 370/353
• CPC Class Codes: H04W 68/12 Inter-network notification
• CPC Class Codes: H04W 76/18 Management of setup rejection or failure
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A method and apparatus are described for providing non-packet switched service to a target radio access technology (RAT) network. A circuit switched (CS) service notification message is received by a wireless transmit/receive unit (WTRU). If the WTRU has been allocated a valid temporary mobile subscriber identity (TMSI), a paging response message including the valid TMSI is transmitted after an inter-system change is performed from a source RAT network to a target RAT network. The CS service notification message is for terminating a CS call request. The source RAT network may be a long term evolution (LTE) network, and the target RAT network may be a third generation partnership project (3GPP) network. Alternatively, if the WTRU has not been allocated a valid TMSI, a paging response message including an international mobile subscriber identity (IMSI) that identifies the WTRU is transmitted after the inter-system change.

Claims

1. A method, implemented by a wireless transmit/receive unit (WTRU), for providing non-packet switched service in a target radio access technology (RAT) network, the method comprising:

receiving a circuit switched (CS) service notification message including an explicit indication that indicates an identity the WTRU is to use after performing an inter-system change from a source RAT network to a target RAT network, wherein the explicit indication includes at least one bit which has a bit value of one that indicates an international mobile subscriber identity (IMSI) of the WTRU should be used after the inter-system change is performed and a bit value of zero that indicates that a temporary mobile subscriber identity (TMSI) allocated for the WTRU should be used after the inter-system change is performed; and

transmitting a paging response message including an identity identified by the explicit indication after the inter-system change is performed.

2. The method of claim 1 wherein the WTRU has been allocated a valid temporary mobile subscriber identity (TMSI), and the explicit indication is an information element (IE) that indicates the TMSI.

3. The method of claim 1 wherein the WTRU has not been allocated a valid temporary mobile subscriber identity (TMSI), and the explicit indication is an information element (IE) that indicates an international mobile subscriber identity (IMSI) that identifies the WTRU.

4. The method of claim 1 wherein the CS service notification message is for terminating a CS call request.

5. The method of claim 1 wherein the source RAT network is a long term evolution (LTE) network, and the target RAT network is a third generation partnership project (3GPP) network.

6. A wireless transmit/receive unit (WTRU) for providing non-packet switched service in a target radio access technology (RAT) network, the WTRU comprising:

a receiver configured to receive a circuit switched (CS) service notification message including an explicit indication that indicates an identity the WTRU is to use after performing an inter-system change from a source RAT network to a target RAT network, wherein the explicit indication includes at least one bit which has a value that indicates an international mobile subscriber identity (IMSI) of the WTRU should be used after the inter-system change is performed and another value that indicates that a temporary mobile subscriber identity (TMSI) allocated for the WTRU should be used after the inter-system change is performed; and

a transmitter configured to transmit a paging response message including an identity identified by the explicit indication after the inter-system change is performed.

7. The WTRU of claim 6 wherein the WTRU has been allocated a valid temporary mobile subscriber identity (TMSI), and the explicit indication is an information element (IE) that indicates the TMSI.

8. The WTRU of claim 6 wherein the WTRU has not been allocated a valid temporary mobile subscriber identity (TMSI), and the explicit indication is an information element (IE) that indicates an international mobile subscriber identity (IMSI) that identifies the WTRU.

9. The WTRU of claim 6 wherein the CS service notification message is for terminating a CS call request.

10. The WTRU of claim 6 wherein the source RAT network is a long term evolution (LTE) network, and the target RAT network is a third generation partnership project (3GPP) network.

11. A method, implemented by a wireless transmit/receive unit (WTRU), for providing non-packet switched service in a target radio access technology (RAT) network, the method comprising:

receiving a circuit switched (CS) service notification message including an explicit indication that indicates an identity the WTRU is to use after performing an inter-system change from a source RAT network to a target RAT network, wherein the explicit indication includes at least one bit which has a value that indicates an international mobile subscriber identity (IMSI) of the WTRU should be used after the inter-system change is performed and another value that indicates that a temporary mobile subscriber identity (TMSI) allocated for the WTRU should be used after the inter-system change is performed; and

transmitting a paging response message including an identity identified by the explicit indication after the inter-system change is performed.

12. The method of claim 11 wherein the WTRU has been allocated a valid temporary mobile subscriber identity (TMSI), and the explicit indication is an information element (IE) that indicates the TMSI.

13. The method of claim 11 wherein the WTRU has not been allocated a valid temporary mobile subscriber identity (TMSI), and the explicit indication is an information element (IE) that indicates an international mobile subscriber identity (IMSI) that identifies the WTRU.

14. The method of claim 11 wherein the CS service notification message is for terminating a CS call request.

15. The method of claim 11 wherein a bit value of one indicates that an international mobile subscriber identity (IMSI) of the WTRU should be used after the inter-system change is performed, and a bit value of zero indicates that a temporary mobile subscriber identity (TMSI) allocated for the WTRU should be used after the inter-system change is performed.

16. The method of claim 11 wherein the source RAT network is a long term evolution (LTE) network, and the target RAT network is a third generation partnership project (3GPP) network.

17. A wireless transmit/receive unit (WTRU) for providing non-packet switched service in a target radio access technology (RAT) network, the WTRU comprising:

a receiver configured to receive a circuit switched (CS) service notification message including an explicit indication that indicates an identity the WTRU is to use after performing an inter-system change from a source RAT network to a target RAT network, wherein the explicit indication includes at least one bit which has a value that indicates an international mobile subscriber identity (IMSI) of the WTRU should be used after the inter-system change is performed and another value that indicates that a temporary mobile subscriber identity (TMSI) allocated for the WTRU should be used after the inter-system change is performed; and

a transmitter configured to transmit a paging response message including an identity identified by the explicit indication after the inter-system change is performed.

18. The WTRU of claim 17 wherein the WTRU has been allocated a valid temporary mobile subscriber identity (TMSI), and the explicit indication is an information element (IE) that indicates the TMSI.

19. The WTRU of claim 17 wherein the WTRU has not been allocated a valid temporary mobile subscriber identity (TMSI), and the explicit indication is an information element (IE) that indicates an international mobile subscriber identity (IMSI) that identifies the WTRU.

20. The WTRU of claim 17 wherein the CS service notification message is for terminating a CS call request.

21. The WTRU of claim 17 wherein a bit value of one indicates that an international mobile subscriber identity (IMSI) of the WTRU should be used after the inter-system change is performed, and a bit value of zero indicates that a temporary mobile subscriber identity (TMSI) allocated for the WTRU should be used after the inter-system change is performed.

22. The WTRU of claim 17 wherein the source RAT network is a long term evolution (LTE) network, and the target RAT network is a third generation partnership project (3GPP) network.