Method and apparatus for efficient signaling and usage of resources for wireless communications supporting circuit switched and packet switched sessions

• US 9,781,636 B2
• Filed: 05/09/2016
• Issued: 10/03/2017
• Est. Priority Date: 10/30/2009
• 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, Olvera-Hernandez, Ulises, Tamaki, Nobuyuki, Adjakple, Pascal M., Tooher, J. Patrick, Wang, Peter S.
• Primary Examiner(s): Patel, Jay P
• Application Number:
  US15/149,536
• Publication Number:
  US 20160255544A1
• Time in Patent Office: 512 Days
• CPC Class Codes: H04B 7/2125 Synchronisation
• CPC Class Codes: H04B 7/2126 using a reference station
• CPC Class Codes: H04J 3/0638 Clock or time synchronisation among nodes; Internode synchronisation synchronization for ring networks H04L12/422; data switching networks with synchronous transmission H04L12/43
• CPC Class Codes: H04W 36/0022 for transferring data sessions between adjacent core network technologies
• CPC Class Codes: H04W 36/00224 between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
• CPC Class Codes: H04W 36/0033 with transfer of context information

Abstract

Method and apparatus efficiently signal and use resources for wireless communications supporting circuit switched (CS) and packet switched sessions (PS). Signaling and interaction between the wireless transmit/receive unit (WTRU), and various network entities, such as the Mobility Management Entity (MME), the Visitor Location Register (VLR), and Base Stations (BS), are used to implement circuit switched fall back (CSFB) in a PS system.

Claims

1. A wireless transmit/receive unit (WTRU) for performing a circuit switch fallback (CSFB), the WTRU comprising:

a memory; and

a processor, the processor being configured to;

determine, via the WTRU, an update in a status of an evolved packet system (EPS) bearer context; and

send an extended service request for the CSFB to a mobility management entity (MME), the extended service request including an EPS bearer context status information element (IE) to update the status of the EPS bearer context.

2. The WTRU of claim 1, wherein the processor is further configured to determine the update in the status of the EPS bearer context by receiving a paging message from an eNode-B that includes an identity of the WTRU.

3. The WTRU of claim 1, wherein the status of the EPS bearer context indicates if the EPS bearer context is active or inactive.

4. The WTRU of claim 1, wherein the processor is further configured to send the extended service request for the CSFB to the MME via an eNodeB.

5. The WTRU of claim 1, wherein the processor is further configured to send a measurement report.

6. The WTRU of claim 1, wherein the processor is further configured to initiate a packet switched handover.

7. A wireless transmit/receive unit (WTRU) for performing a circuit switch fallback (CSFB), the WTRU comprising:

a processor, the processor being configured to;

determine, via the WTRU, an update in a status of an evolved packet system (EPS) bearer context; and

send an extended service request for a mobile originated CSFB to a mobility management entity (MME), the extended service request including an EPS bearer context status information element (IE) to update the status of the EPS bearer context.

8. The WTRU of claim 7, wherein the status of the EPS bearer context indicates if the EPS bearer context is active or inactive.

9. The WTRU of claim 7, wherein the processor is further configured to send a measurement report.

10. The WTRU of claim 7, wherein the processor is further configured to initiate a packet switched handover.

11. The WTRU of claim 7, wherein the processor is further configured to send a location update.

12. The WTRU of claim 7, wherein the processor is further configured to initiate a circuit switched call.

13. The WTRU of claim 7, wherein the processor is further configured to send the extended service request for the mobile originated CSFB to the MME via an eNodeB.

14. A wireless transmit/receive unit (WTRU) for performing a circuit switch fallback (CSFB), the WTRU comprising:

a memory; and

a processor, the processor being configured to;

receive a paging message from an eNode-B including an identity of the WTRU; and

send an extended service request for a mobile terminated CSFB to a mobility management entity (MME), the extended service request including an evolved packet system (EPS) bearer context status information element (IE) to update a status of an EPS bearer context.

15. The WTRU of claim 14, wherein the status of the EPS bearer context indicates if the EPS bearer context is active or inactive.

16. The WTRU of claim 14, wherein the processor is further configured to establish a radio resource control (RRC) connection with the eNode-B.

17. The WTRU of claim 14, wherein the processor is further configured to send a measurement report.

18. The WTRU of claim 14, wherein the processor is further configured to initiate a packet switched handover.

19. The WTRU of claim 14, wherein the processor is further configured to send the extended service request for the mobile terminated CSFB to the MME via the eNodeB.