Fair Resource Allocation with QoS Guarantee in Secure Multiuser TDMA Networks

Zhiquan Bai,Piming Ma,Kyungsup Kwak,Yanbo Ma,Tongtong Wang

doi:10.1155/2018/1489659

Abstract

We investigate a secure multiuser time division multiple access (TDMA) system with statistical delay quality of service (QoS) guarantee in terms of secure effective capacity. An optimal resource allocation policy is proposed to minimize the β-fair cost function of the average user power under the individual QoS constraint, which also balances the energy efficiency and fairness among the users. First, convex optimization problems associated with the resource allocation policy are formulated. Then, a subgradient iteration algorithm based on the Lagrangian duality theory and the dual decomposition theory is employed to approach the global optimal solutions. Furthermore, considering the practical channel conditions, we develop a stochastic subgradient iteration algorithm which is capable of dynamically learning the intended wireless channels and acquiring the global optimal solution. It is shown that the proposed optimal resource allocation policy depends on the delay QoS requirement and the channel conditions. The optimal policy can save more power and achieve the balance of the energy efficiency and the fairness compared with the other resource allocation policies.

Highlights

Due to the broadcast nature of wireless communications, much more attention has been paid to the issues of privacy and security in wireless communication networks
Based on the effective capacity theory proposed by Wu and Negi in [23, 24], our preliminary work has investigated the delay quality of service (QoS) guarantee for secrecy system [25], which took the secure effective capacity as the QoS metric
We propose a fair energy-efficient resource allocation policy for the multiuser time division multiple access (TDMA) secrecy system

Summary

Introduction

Due to the broadcast nature of wireless communications, much more attention has been paid to the issues of privacy and security in wireless communication networks. Security is achieved by cryptographic encryption protocols of the upper layers. The security of encryption will be invalid if the wiretappers have huge computational power. From the information-theoretic perspective, physicallayer security can guarantee the reliable secure transmission via utilizing the physical characteristics of wireless channels. The concept of information-theoretic secrecy was originally introduced by Shannon [1]. A relaxed notion of secrecy was presented by Wyner in his seminal work [2] based on the concept of a wiretap channel model. The results were subsequently extended to the broadcast channels [3]

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