Real-Time Qos Support in Wireless Sensor Networks: A Survey

Abstract

Real-time wireless sensor networks are becoming more and more important by the requirement of message delivery timeliness in emerging new applications. Supporting real-time QoS in sensor networks faces severe challenges due to the wireless nature, limited resource, low node reliability, distributed architecture and dynamic network topology. There are tradeoffs between different application requirements including energy efficiency and delay performance. This paper studies the state of the art of current real-time solutions including MAC protocols, routing protocols, data processing strategies and cross-layer designs. Some research challenges and future design favors are also identified and discussed.

Real-Time Routing Protocols for Wireless Sensor Networks: A Survey

“…In papers [6], [7] authors pointed out various challenges and open research issues like; RT and energy aware, RT and multiple QoS (reliability, band width efficient…etc) requirements, RT capability for multiple sources and multiple sinks, cross layer design to meet the HRT requirements and RT support for the special application scenarios. From the above literature, it is observed that the issues like…”

“…Likewise, WSNs have gained an immense attention for their ability in meeting the real time QoS guarantee in many time critical scenarios. In general, real time packet communication guarantee can be categorized as i) Hard Real Time (HRT) ii) Soft Real Time (SRT) [4][5][6][7][8]. HRT should support a deterministic dead time.…”

An exploration of geographic routing with k-hop based searching in wireless sensor networks

“…The generalization to 2-hop or more generally k-hop based routing has not been profoundly investigated despite interesting and possible [7]. An exploration will be helpful to provide a reference for future design and consideration, especially for the purpose in emerging real-time wireless sensor networks (WSN) [8] and some demanding applications [9].…”

RRDVCR: Real-Time Reliable Data Delivery Based on Virtual Coordinating Routing for Wireless Sensor Networks

“…The MAC layer provides channel access to the next hop while the network layer provides the end-to-end transmission time. Using cross-layer design approach optimum results can be obtained [15].…”

“…Wireless Sensor Networks has a wide range application namely, intruder tracking, medical care, health diagnosis and fire monitoring [15]. Industrial communication community ap-plications demands rigid end-to-end delivery and reliability [10] [13] under the constraints of wireless communication.…”