Smart Phone and Next Generation Mobile Computing

282 Smart Phone and Next-Generation Mobile Computing

mobile station will send path refresh messages periodically to indi-

cate its presence, thereby refreshing relevant routing caches. When

the mobile station moves within the home domain, it performs a

path update operation so as to build an updated path to the domain

root router. When it moves to another domain (foreign domain),

the domain root router of the new domain will act as the foreign

agent to the mobile station, allowing intramobility within the for-

eign domain. It achieves this by assigning a co-located care-of address

(CCoA) to the visiting mobile station and notifying the home agent

(the domain root router of the home domain) of this change. The

mobile station also performs path update ...