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Can someone please explain how handover working in WiFi Network?

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Can someone please explain how handover working in WiFi Network?
posted Jul 5, 2014 by Amit Kumar Pandey

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During the Handover from LTE to WiFi, how an UE is authenticated at WiFi network ?
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Can someone please explain handover procedure between LTE network and wifi network ?

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As per my knowledge, WiFI calling is supported over untrusted(using ePDG/S2b) networks from Rel 10 onwards.
But I am not sure about WiFi over trusted(TWAG/S2a) networks and having few doubts.

  1. Is VoWiFI is supported over trusted(using TWAG or S2a) networks, if not then what are the limitation?
  2. Is LTE to WiFI handover supported over S2a interface(TWAG) ?

Any help, pointers will be appreciated.

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