Recent developments and widespread in wireless sensor network have led to
many routing protocols, many of these protocols consider the efficiency of
energy as the ultimate factor to maximize the WSN lifetime. The quality of
Service (QoS) requirements for different applications of wireless sensor
networks has posed additional challenges. Imaging and data transmission
needs both QoS aware routing and energy to ensure the efficient use of
sensors. In this paper, we propose an Efficient, Energy-Aware, Least Cost,
(ECQSR) quality of service routing protocol for sensor networks which can
run efficiently with best-effort traffic processing. The protocol aims to
maximize the lifetime of the network out of balancing energy consumption
across multiple nodes, by using the concept of service differentiation, finding
lower cost by finding the shortest path using nearest neighbor algorithm
(NN), also put certain constraints on the delay of the path for real-time data
from where link cost that captures energy nodes reserve, energy of the
transmission, error rate and other parameters. The results show that the
proposed protocol improves the network lifetime and low power
consumption. 

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