| 摘要 |
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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