Statistical Delay QoS Provisioning for Energy-Efficient Spectrum-Sharing Based Wireless Ad Hoc Sensor Networks

Abstract

In this paper, we develop the statistical delay quality-of-service (QoS) provisioning framework for the energy-efficient spectrum-sharing based wireless ad hoc sensor network (WAHSN), which is characterized by thedelay-bound violation probability. Based on the established delay QoS provisioning framework, we formulate the nonconvex optimization problem which aims at maximizing the average energy efficiency of the sensor node in the WAHSN while meeting PU’s statistical delay QoS requirement as well as satisfying sensor node’s average transmission rate, average transmitting power, and peak transmitting power constraints. By employing the theories offractional programming,convex hull, andprobabilistic transmission, we convert the original fractional-structured nonconvex problem to theadditively structured parametric convex problemand obtain the optimal power allocation strategy under the given parameter via Lagrangian method. Finally, we derive the optimal average energy efficiency and corresponding optimal power allocation scheme by employing theDinkelbach method. Simulation results show that our derived optimal power allocation strategy can be dynamically adjusted based on PU’s delay QoS requirement as well as the channel conditions. The impact of PU’s delay QoS requirement on sensor node’s energy efficiency is also illustrated.

Robust Relay in Narrow-Band Communications for Ubiquitous IoT Access

“…In a typical wireless access framework for IoT, heterogeneous wireless networks often coexist, especially when the mobile communications evolve to the 5th generation (5G) era. In 5G network, diverse networks, such as macro/small cellular networks [2,3], vehicular and transportation networks [4,5], cognitive radio networks [6,7], and device-to-device networks [8][9][10], all need to be effectively integrated to implement seamless communications in future wireless networks. Such an interconnection will bring unprecedented convenience for users as well as economical opportunities for market, but it will also require robust and sophisticated approaches to ensure quality of service (QoS) requirements for services, especially on the security and reliability.…”