Seamless handoff for multimedia services
First Claim
1. In a network wherein a Mobile Station (MS) has a multimedia session with a first MultiMedia Domain (MMD) comprising a first Packet Data Node (PDN), a first Policy Decision Function (PDF) and a first Application Function (AF), a method for maintaining said multimedia session for said MS following a release of a first network attachment between said MS and said first PDN consecutive to a handoff from said first PDN to a second PDN, comprising the steps of:
- sending from said first PDN to said first PDF a state report message indicating that said first network attachment to said MS has been released;
sending from said first PDF to said first AF a network detach message indicating that the multimedia session is requested to be maintained;
responsive to said network detach message, maintaining at said first AF said multimedia session and fetching at said first AF a context of said multimedia session;
sending a network detach response from said first AF to said first PDF, said network detach response comprising an acknowledgement and further comprising said context;
sending a state report response from said first PDF to said first PDN, said state report response comprising an acknowledgement and further comprising said context; and
sending said context from said first PDN to said second PDN.
1 Assignment
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Accused Products
Abstract
A method and Policy Decision Function node are provided for maintaining a multimedia session in an alive state for a mobile station following a release of a network attachment resulting from a handoff from a first Packet Data Node to a second Packet Data Node followed by a dormancy state of the mobile station. If both Packet Data Nodes are comprised into a same MultiMedia Domain, the Policy Decision Function informs an Application Function of the MultiMedia Domain that the multimedia session shall be maintained. Otherwise, if the two Packet Data Nodes are comprised into distinct MultiMedia Domains, a first Policy Decision Function, in addition to informing a first Application Function that the multimedia session shall be maintained, also fetches a context of the multimedia session. Further, the first Policy Decision Function transfers the context of the multimedia session to the first Packet Data Node, which in turn sends the context of the multimedia session to the second Packet Data Node. Subsequent to reactivation of the mobile station, a second Policy Decision Function transfers the context of the multimedia session from the second Packet Data Node to a second Application Function in a second MultiMedia Domain.
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Citations
16 Claims
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1. In a network wherein a Mobile Station (MS) has a multimedia session with a first MultiMedia Domain (MMD) comprising a first Packet Data Node (PDN), a first Policy Decision Function (PDF) and a first Application Function (AF), a method for maintaining said multimedia session for said MS following a release of a first network attachment between said MS and said first PDN consecutive to a handoff from said first PDN to a second PDN, comprising the steps of:
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sending from said first PDN to said first PDF a state report message indicating that said first network attachment to said MS has been released;
sending from said first PDF to said first AF a network detach message indicating that the multimedia session is requested to be maintained;
responsive to said network detach message, maintaining at said first AF said multimedia session and fetching at said first AF a context of said multimedia session;
sending a network detach response from said first AF to said first PDF, said network detach response comprising an acknowledgement and further comprising said context;
sending a state report response from said first PDF to said first PDN, said state report response comprising an acknowledgement and further comprising said context; and
sending said context from said first PDN to said second PDN. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A Packet Data Function (PDF) in a MultiMedia Domain (MMD) for maintaining a multimedia session for a Mobile Station (MS) following a release of a network attachment between said MS and a first Packet Data Node (PDN), comprising:
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a Go interface input port connected towards said first PDN for receiving a state report message, said state report message comprising an indication that said network attachment to said MS has been released;
a Gq interface output port connected towards an AF for sending a network detach message, said network detach message comprising a request to maintain the multimedia session;
a Gq interface input port connected towards said AF for receiving a network detach response, said network detach response comprising an acknowledgement and comprising a context of said multimedia session; and
a Go interface output port connected towards said first PDN for sending a state report response, said state report response comprising an acknowledgement and comprising a context of said multimedia session. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A Packet Data Function (PDF) in a MultiMedia Domain (MMD) for maintaining a multimedia session for a Mobile Station (MS) following a release of a network attachment between said MS and a first Packet Data Node (PDN), comprising:
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a Go interface input port connected towards a second PDN for receiving a context of said multimedia session; and
a Gq interface output port connected towards an AF for sending said context of said multimedia session.
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Specification