Managing race conditions between circuit switched fallback requests
AssigneeInterDigital Patent Holdings, Inc.
InventorsJ. Patrick Tooher, Mahmoud Watfa, Behrouz Aghili, Ulises Olvera-Hernandez, Pascal Adjakple
Life of this patent
Estimating the term…
Abstract
Circuit switched fallback (CSFB) requests may be managed. A mobile management entity (MME) can detect one or more pending CSFB requests. In response to detecting the pending CSFB request(s), the MME can generate a message that indicates the one or more pending CSFB requests, and can communicate the message to one of a mobile switching center (MSC) and a virtual location register (VLR).
Claims14
A method performed by a wireless transmit/receive unit (WTRU), the WTRU having selected a first domain, the method comprising:
- the WTRU performing a service request procedure for a circuit switched fallback (CSFB);
- the WTRU determining that a bearer is not established and entering an EMI-DEREGISTERED state, wherein entering the EMM-DEREGISTERED state includes performing a detach procedure without initiation of an attach procedure, and wherein the determination is associated with the service request procedure;
- the WTRU reselecting to a second domain while the WTRU is in the EMI-DEREGISTERED state, wherein the second domain is a circuit switched domain;
- and
- the WTRU continuing with a circuit switched service.
A wireless transmit/receive unit (WTRU), the WTRU having selected a first domain, the WTRU comprising:
- a processor configured to:
- perform a service request procedure for a circuit switched fallback (CSFB);
- determine that a bearer is not established and enter an EMM-DEREGISTERED state, wherein being configured to enter the EMM-DEREGISTERED state comprises being configured to perform a detach procedure without initiation of an attach procedure, and wherein the determination is associated with the service request procedure;
- and
- reselect to a second domain while in the EMM-DEREGISTERED state, the second domain being a circuit switched domain;
- and
- continue with a circuit switched service.
Dependencies are inferred from the claim text.