Exploring opportunistic scheduling in ad-hoc network with physical layer security

Abstract

In this paper, scheduling scheme under physical layer security is studied. This emerging technology is introduced to provide perfect secrecy to wireless ad-hoc network. However, a big loss of network performance is also imported to the system. As links with different physical layers coexist in the wireless network, service qualities like overall throughput are affected if traditional scheduling schemes are applied. Thus, new MAC layer scheduling scheme has to be developed. Here, opportunistic scheduling with scaled transmission rate is used to solve the problem. A weighted scaling function is applied on different transmission rate of diversified links, and optimal stopping theory is employed to ensure that only the good part of each link is used for transmitting. A pure threshold policy can be derived for the scheduling scheme. The scenario with distributed ad-hoc network is also considered, a Nash equilibrium can be conducted using game theory for the selection of individual weights.