Abstract
It is well known that the performance of Internet of Things application services is easy to be affected by internal noise of sensor, external environment interference and constriction of system resource. In order to solve the above problems, we studied the characteristics of bit error rate, outage ratio, signal to noise, and scale of relay sensors with channel state to choose the optimal transmission control scheme between direct mode and cooperative mode, building upon which we proposed the opportunistic cooperative automatic repeat request (ARQ) mechanism based on the rules and features of throughput ratio, average delay, packet error rate and energy efficiency, in consideration of retransmission time and channel quality. More importantly, the proposed opportunistic cooperative ARQ mechanism could set up the max retransmission time and control the progress of cooperative transmission according to the real-time network and sensor state, as well as Quality of Services (QoS) guarantee requirements of Internet of Things applications. The mathematical analyses and experiment results show that the proposed scheme is superior to the QoS provisioning schemes based on cooperative ARQ alone and direct transmission with channel state alone in terms of reliability, real time performance and life cycle of system, as well as energy efficiency.
Highlights
The computation, store, and transportation of several applications of Internet of Things depend on the deployment of high-density sensor networks [1]
The following issues need to be researched: (1) what factors need to be considered with the cooperative transmission; (2) how to perceive the external interference, channel and sensor state; (3) how to control the progress of cooperative communication; (4) how to combine the error control protocol and cooperative communication for Quality of Services (QoS) provisioning and so on
It is primary and important to study and analyze the opportunistic cooperative automatic repeat request (ARQ) scheme based on channel state sensing method, which could keep the optimal real time performance and energy efficiency of Internet of Things, and guarantee the reliability and throughput
Summary
The computation, store, and transportation of several applications of Internet of Things depend on the deployment of high-density sensor networks [1]. The combination of cooperative communication and error control technology is one key problem for guaranteeing the QoS of sensors applications in Internet of Things. A novel Medium Access Control (MAC) protocol for ARQ-based [12] was proposed by using network coding techniques for achieving a better network performance in terms of energy efficiency without compromising the offered QoS. It is primary and important to study and analyze the opportunistic cooperative ARQ scheme based on channel state sensing method, which could keep the optimal real time performance and energy efficiency of Internet of Things, and guarantee the reliability and throughput. We research and study the above issues with opportunistic cooperative ARQ based on sensing channel and sensor state, to build the efficient, robust and effective QoS provisioning scheme of sensors in Internet of Things
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