Link-Reliability Based Two-Hop Routing for Wireless Sensor Networks
  Wireless Sensor Networks (WSNs) emerge as underlying infrastructures for new classes of large scale net- worked embedded systems. However, WSNs system designers must fulfill the Quality-of-Service (QoS) requirements imposed by the applications (and users). Very harsh and dynamic physical environments and extremely limited energy/computing/memory/communication node resources are major obstacles for satisfying QoS metrics such as reliability, timeliness and system lifetime. The limited communication range of WSN nodes, link asymmetry and the characteristics of the physical environment lead to a major source of QoS degradation in WSNs. This paper proposes a Link Reliability based Two-Hop Routing protocol for wireless Sensor Networks (WSNs). The protocol achieves to reduce packet deadline miss ratio while consid- ering link reliability, two-hop velocity and power efficiency and utilizes memory and computational effective methods for estimating the link metrics. Numerical results provide insights that the protocol has a lower packet deadline miss ratio and longer sensor network lifetime. The results show that the proposed protocol is a feasible solution to the QoS routing problem in wireless sensor networks that support real-time applications. 
T Shiva Prakash, K B Raja, K R Venugopal, S S Iyengar, L M Patnaik
cs.NI