Smart Phone and Next Generation Mobile Computing

366 Smart Phone and Next-Generation Mobile Computing

the CN has a home agent and an AAA server. Using serving GPRS

service nodes (SGSNs) and gateway GPRS support nodes (GGSNs) as

gateways, a mobile station’s visited AAA server can communicate

with its home AAA server for usage updates, roughly the same proce-

dure as for location updates with the exception that the data being

transmitted are related to AAA functions.

6.2.2 Secure Wireless Transaction

Mobile applications are primarily deployed in a heterogeneous net-

work environment in which wireless and wired networks, secured

enterprise networks, and wide open home wireless networks coexist

and interconnect. One cannot count solely on wireless commu-

nication security even though the underlying wireless ...