Access Network Discovery and Selection Function (ANDSF) is still evolving and with the introduction of Hotspot 2.0 (HS 2), there is a good possibility to provide seamless roaming from Cellular to Wi-Fi, Wi-Fi to Wi-Fi and Wi-Fi to Cellular.
There is a good paper (not very recent) by Alcatel-Lucent and BT that explains these roaming scenarios and other ANDSF policies related information very well. Its embedded below:
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As long as ANDSF only address WiFi it misses its true potential.
ANDSF should address all RATs including 2/3g.
Its ultimate potential will be the algorithms developed on the Server for RAT selection, RAT KPIs, TOD, etc.
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