Smart Phone and Next Generation Mobile Computing

Mobile Networking Challenges 325

service levels. The role of a mobile node in this model varies signif-

icantly over time depending on its operation for a packet stream:

transmission (ingress node), forwarding (code node), and reception

(egress node). Per-flow QoS provisioning is only performed for traf-

fic of the highest service level, thus flow state management will be

limited to a small scale.

Node mobility also has a profound impact on QoS aware rout-

ing protocols for MANETs. Not only route reachability but also link

quality become highly variable and both of them must be taken into

consideration when selecting one or more paths if multi-path routing

is used. For a routing protocol to support QoS, a set of QoS parameters

should be encapsulated into ...