| 摘要 |
The present invention is directed towards a method, a network and a portable communication device transferring a session ongoing between a first and a second device having a high level of information content from a first link over a first network to a second link. A low performance circumstance for the session over the first link to the first wireless network is detected, (step 70), communication for the session is handed over to a second link using a lower level of information content in the session, (step 76), such that communication can be continued over the second link with a lower level of information content than over the first link despite the low performance circumstance. Because of the invention a video telephone session in a third-generation cellular network can be continued with only voice in a second-generation cellular network. <IMAGE>
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