On Physically Secure and Stable Slotted ALOHA System

TL;DR

This paper analyzes the stability and physical layer security of a finite-terminal slotted ALOHA system, deriving secrecy-stability regions and optimizing transmission probabilities for improved throughput.

Contribution

It introduces a novel methodology for jointly analyzing stability and security in slotted ALOHA systems, including new secrecy-stability regions for two-terminal cases.

Findings

Secrecy-stability regions are derived for N=2 in both dominant and original systems.

Optimal transmission probabilities for maximizing throughput are identified.

A new approach for joint stability and security analysis is proposed.

Abstract

In this paper, we consider the standard discrete-time slotted ALOHA with a finite number of terminals with infinite size buffers. In our study, we jointly consider the stability of this system together with the physical layer security. We conduct our studies on both dominant and original systems, where in a dominant system each terminal always has a packet in its buffer unlike in the original system. For N = 2, we obtain the secrecy-stability regions for both dominant and original systems. Furthermore, we obtain the transmission probabilities, which optimize system throughput. Lastly, this paper proposes a new methodology in terms of obtaining the joint stability and secrecy regions.