Method and apparatus for efficient signaling and usage of resources for wireless communications supporting circuit switched and packet switched sessions
First Claim
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1. A method, performed by a visitor location register (VLR), for avoiding an inter-system change for a wireless transmit/receive unit (WTRU), the method comprising:
- deciding to abort a mobile terminating (MT) circuit switched fallback (CSFB) to the WTRU;
determining if a paging request to start the MT CSFB call has been sent; and
on a condition that the paging request has been sent, sending an abort message to a mobility management entity (MME) requesting the MME to cancel the MT CSFB call.
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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.
40 Citations
20 Claims
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1. A method, performed by a visitor location register (VLR), for avoiding an inter-system change for a wireless transmit/receive unit (WTRU), the method comprising:
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deciding to abort a mobile terminating (MT) circuit switched fallback (CSFB) to the WTRU; determining if a paging request to start the MT CSFB call has been sent; and on a condition that the paging request has been sent, sending an abort message to a mobility management entity (MME) requesting the MME to cancel the MT CSFB call. - View Dependent Claims (2, 3, 4, 5)
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6. A visitor location register (VLR) for avoiding an inter-system change for a wireless transmit/receive unit (WTRU), the VLR comprising:
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circuitry configured to decide to abort a mobile terminating (MT) circuit switched fallback (CSFB) to the WTRU; circuitry configured to determine if a paging request to start the MT CSFB call has been sent; and on a condition that the paging request has been sent, the VLR further comprises circuitry configured to send an abort message to a mobility management entity (MME) requesting the MME to cancel the MT CSFB call. - View Dependent Claims (7, 8, 9, 10)
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11. A method, performed by a Mobility Management Entity (MME), for avoiding an inter-system change for a wireless transmit/receive unit (WTRU), the method comprising:
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receiving an abort message from a visitor location register (VLR) indicating to the MME to cancel a mobile terminating (MT) circuit switched fallback (CSFB) call to the WTRU; on a condition that the MME has already received an extended service request (ESR) from the WTRU, sending a service reject message to the WTRU indicating that the MT CSFB call is aborted; and sending no further messages to the WTRU. - View Dependent Claims (12, 13, 14, 15)
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16. A mobility management entity (MME) for avoiding an inter-system change for a wireless transmit/receive unit (WTRU), the MME comprising:
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circuitry configured to receive an abort message from a visitor location register (VLR) indicating to the MME to cancel a mobile terminating (MT) circuit switched fallback (CSFB) call to the WTRU; on a condition that the MME has already received an extended service request (ESR) from the WTRU, circuitry configured to send a service reject message to the WTRU indicating that the MT CSFB call is aborted; and circuitry configured to send no further messages to the WTRU. - View Dependent Claims (17, 18, 19, 20)
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Specification