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LTE: How does handover work between LTE and Wifi ?

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LTE: How does handover work between LTE and Wifi ?
posted Dec 9, 2015 by Harshita

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1 Answer

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You can refer to section 8.6.1 Handover from Untrusted Non-3GPP IP Access with GTP on S2b to 3GPP Access from 23.402 for same.

In short from what i know when a user moves from Non-3GPP access wi-fi to E-UTRAN MME will send a CSR to SGW with Handover Indication bit set in Indication flags and SGW will then forward it to PGW. PGW will then inform PCRF by sending a CCR-U message

After getting response from PCRF will send the CSResponse to SGW and then to MME to create an EPS bearer.

Also for 3GPP to Non-3GPP handover you can refer
8.6.2 Handover from 3GPP access to untrusted Non-3GPP IP Access with GTP on S2b section

If you came across any doubts please share...

Regards,
Peeyush Sharma

answer Dec 9, 2015 by Peeyush Sharma
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