In this paper, we present a novel packet delivery sensor data that contains an abnormallv hieh termerature C t Large scale with thousands of densely placed nodes, and Unreliable nature of wireless links'. Most of current QoS provisioning protocols [2], [3], [4], [51 in wireless ad hoc networks are based on the end-to-end path discovery, resource reservation along the discovered path, and path recovery in case of topology changes. However, such approaches are not suitable for sensor network applications with above characteristics for many reasons. Firstly, the path discovery latency is not acceptable for urgent aperiodic packets. Also, for the unpredictable aperiodic packets, it is not practical to reserve resources along the end-to-end path. Even for periodic continuous traffics, the end-to-end path based mechanisms are problematic in dynamic sensor networks since service disruption during the path recovery is not acceptable in mission critical applications. Furthermore, the approaches are not scalable due to huge overhead of path discovery and recovery in large scale sensor networks. Recent QoS studies in sensor networks [6]. [7], [8] focus on only one QoS domain, either timeliness or reliability. They are also limited in differentiating services for traffics with different levels of timeliness and reliability requirements. Another study [9] can guarantee the different real-time requirements by realizing EDF packet scheduling in a decentralized way. temperature can be delivered to the control center tolerating a certain percentage of loss. On the other hand, the recent study that 20% of neighbor in a radio communication range suffer more than 10% of packet loss. 2646 0 -~8 0 3 -8~~~-~~o~~z a . 0 0 (cpoos IEEE Wireless Personal Multimedia Communicariuns. September 2001. 1261 Q. H u n g , C. Lu. and G.-C-Roman. "Spatiotemporal multicast in sensor netwroks," in Proceedings of the firsr intemional conference on Embedded nelworked sensor syslems, November 2003.
On the other hand, a number of protocols have been proposed for QoS routing in wireless ad-hoc networks taking the dynamic nature of the network into account REF .
Probabilistic QoS guarantee in reliability and timeliness domains in wireless sensor networks
Proceedings IEEE 24th Annual Joint Conference of the IEEE Computer and Communications Societies.
Proceedings IEEE 24th Annual Joint Conference of the IEEE Computer and Communications Societies.
Computer Science