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

• US 9,338,701 B2
• Filed: 02/28/2014
• Issued: 05/10/2016
• 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:
  US14/194,195
• Publication Number:
  US 20140177596A1
• Time in Patent Office: 802 Days
• Field of Search: None
• US Class Current: 1/1
• 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 method for synchronizing bearer contexts between a transmitter entity and a receiver entity, the method comprising:

detecting, at the transmitter entity, an update in a status of a bearer context; and

transmitting a bearer context status information element (IE) in a non-access stratum (NAS) message from the transmitter entity to the receiver entity, wherein the bearer context status IE is based on the update in the status of the bearer context, and wherein the NAS message is a next message sent from the transmitter entity to the receiver entity based on the update in the status of the bearer context being detected.

2. The method of claim 1 wherein the bearer context is an evolved packet system (EPS) bearer context.

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

4. The method of claim 1 wherein the transmitter entity is a wireless transmit/receive unit (WTRU) and the receiver entity is a mobility management entity (MME).

5. The method of claim 1 wherein the transmitter entity is a mobility management entity (MME) and the receiver entity is a wireless transmit/receive unit (WTRU).

6. The method of claim 1 wherein the NAS message comprise an extended service request (ESR) message.

7. A transmitter entity for synchronizing bearer contexts with a receiver entity, the transmitter entity configured at least in part to:

detect an update in a status of a bearer context; and

provide a bearer context status information element (IE) in a non-access stratum (NAS) message to the receiver entity, wherein the bearer context status IE is based on the update in the status of the bearer context, and wherein the NAS message is a next message sent from the transmitter entity to the receiver entity based on the update in the status of the bearer context being detected.

8. The transmitter entity of claim 7 wherein the bearer context is an evolved packet system (EPS) bearer context.

9. The transmitter entity of claim 7 wherein the status of the bearer context indicates if the bearer context is active or inactive.

10. The transmitter entity of claim 7 wherein the transmitter entity is configured as a wireless transmit/receive unit (WTRU) and wherein the receiver entity is configured as a mobility management entity (MME).

11. The transmitter entity of claim 7 wherein the transmitter entity is configured as a mobility management entity (MME) and wherein the receiver entity is configured as a wireless transmit/receive unit (WTRU).

12. The transmitter entity of claim 7 wherein the NAS message comprise an extended service request (ESR) message.