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Proposed Priorities and Possible SDOs
There is current interest in problem 1 (access network selection)
There is current interest in problem 3 (roaming intermediary selection)
Ignore the rest for now...

Problem 1 belongs to layer 2
Problem 3 needs at least partial IETF work, though intermediary discovery could also be done at layer 2
Long-term, discovery is most efficient at layer 2
=> Any IETF intermediary discovery solution would necessarily be short-term
PPT Version