Improving qos parameters using dynamic priority scheduling (Dps) protocol for wireless sensor networks

Abstract

Packet scheduling is an emerging topic in wireless data transmission since the migration towards the packet-based networks. The uncertainty factor of the channel brings another dimension and opportunity to the scheduling schemes. Packets are defined with dead-line values depending on the type of the traffic they belong to. This value essentially describes the life time of the packet, which can wait in queue before it is no longer useful, in this case it should be dropped. The second possibility of dropping a packet arises due to the fact that each item of user equipment has a finite-sized queue and packets are constantly arriving to be sent. The incoming number of packets/time slot depends on traffic load. If traffic load is on average higher than the rate at the packets are scheduled, the queues gradually fill until they are full. This paper focuses on Dynamic Priority Scheduling (DPS) protocol approach to meet QoS requirements for packets such as throughput, delay and packet loss.