Secure Broadcasting over Fading Channels with Statistical QoS Constraints

TL;DR

This paper investigates secure broadcasting over fading channels with statistical QoS constraints, deriving optimal power control policies to maximize confidential and common message throughput under buffer limitations.

Contribution

It introduces the effective secure throughput region for fading broadcast channels with QoS constraints and derives optimal power control policies to achieve boundary points.

Findings

The throughput region is convex.

Optimal power control policies are characterized.

Effective capacity measures throughput under QoS constraints.

Abstract

In this paper, the fading broadcast channel with confidential messages is studied in the presence of statistical quality of service (QoS) constraints in the form of limitations on the buffer length. We employ the effective capacity formulation to measure the throughput of the confidential and common messages. We assume that the channel side information (CSI) is available at both the transmitter and the receivers. Assuming average power constraints at the transmitter side, we first define the effective secure throughput region, and prove that the throughput region is convex. Then, we obtain the optimal power control policies that achieve the boundary points of the effective secure throughput region.