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Delayed fast handover MN P-AN N-AN PAR NAR HA AAA Access-request (PMIP-supported) Access-accept (Root Key) BU (MN-AAA Auth) BA A16-HO Req/Initiate (PAR) A11-RRQ/RRP (Flow ID, PAR) HO Request (Flow ID, CID, GRE key) HO Response (Context, GRE key, Root Key, Delayed) packet (dst:PCoA) [buffering] Root Key Root Key Access-Req/Accept MN-AAA sec. PCoA Root Key MN-AAA sec. Link-layer connection (PPP) |