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LTE: Which interface is used for mutual authentication of UE and 3GPP AAA sever ?

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When an UE moves from LTE to Wifi, how does authentication procedure work ?

posted Jul 14, 2016 by Vikram Singh

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1 Answer

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When an UE moves from LTE network to WLAN (wifi), it is authenticated by WLAN. WLAN Access point receives the identity information from UE and then pass this information to 3GPP AAA server by using Wa interface. This interface can use RADIUS or DIAMETER protocol.

answer Jul 16, 2016 by Harshita
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+3 votes

During the Handover from LTE to WiFi, how an UE is authenticated at WiFi network ?
Is there any difference in authentication procedure when UE is handed over to un-trusted or trusted WiFi network ?

0 votes

Can someone please explain handover procedure between LTE network and wifi network ?

+3 votes

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.

+1 vote

As far as I studied, I know following options that can be used for LTE and Wifi interworking:
1- LTE - U (LTE Unlicensed)
2. LAA (Licensed Assisted Access)
3. LWA (LTE wifi aggregation)
4. MPTCP (Multi path TCP)

Out of above options, there might be other options which I don't know. But out of above four which one is best and due to what reason operator will choose the best one ?

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