Method for optimizing handover between communication networks
First Claim
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1. A method for ensuring continuity of a communication session when a user equipment hands over from a first communication network to a second cellular communication network comprising the steps of:
- performing an authentication procedure for a packet data session with a second communication network while still being attached to a first communication network, and simultaneously performing a packet data session establishment procedure with the second communication network while still being attached to the first communication network.
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Abstract
A method for ensuring continuity of a communication session when a user equipment hands over from a first communication network to a second cellular communication network is provided. The method, in one embodiment, includes the steps of performing an authentication procedure for a packet data session with the second network while still being attached to the first network and simultaneously performing a packet data session establishment procedure with the second network while still being attached to the first network.
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Citations
15 Claims
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1. A method for ensuring continuity of a communication session when a user equipment hands over from a first communication network to a second cellular communication network comprising the steps of:
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performing an authentication procedure for a packet data session with a second communication network while still being attached to a first communication network, and simultaneously performing a packet data session establishment procedure with the second communication network while still being attached to the first communication network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for ensuring continuity of a communication session, the method comprising:
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handing over by a user equipment from a first communication network to a second cellular communication network, and when the user equipment hands over from the first communication network to the second cellular communication network, maintaining an attachment of the user equipment to the second cellular communication network after the user equipment moves away from a coverage area of the second cellular communication network for a predetermined time in order to allow the user equipment to return to the second cellular communication network without having to repeat an authentication procedure and a packet data session establishment procedure before handing over to the second network. - View Dependent Claims (11, 12, 13)
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14. A communication system comprising a user equipment, a first communication network and a second cellular communication network, the system being arranged to:
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enable continuity of a communication session when a user equipment moves from a coverage area of the first communication network to a coverage area of a second cellular communication network, simultaneously perform an authentication procedure for a packet data session with the second cellular communication network and perform a packet data session establishment procedure with the second cellular communication network while the user equipment is still attached to the first communication network.
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15. A communication system for ensuring continuity of a communication session when a user equipment hands over from a first communication network to a second cellular communication network, the communication system comprising:
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first performing means for performing an authentication procedure for a packet data session with a second communication network while still being attached to a first communication network, and second performing means for simultaneously performing a packet data session establishment procedure with the second communication network while still being attached to the first communication network.
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Specification