Secrecy Outage Probability of Cognitive Small-Cell Network with Unreliable Backhaul Connections

TL;DR

This paper analyzes the secrecy outage probability in cognitive small-cell networks with unreliable wireless backhaul, proposing an optimal transmitter selection scheme and deriving closed-form expressions to evaluate performance.

Contribution

It introduces an optimal transmitter selection scheme and provides closed-form expressions for secrecy outage probability considering backhaul unreliability.

Findings

Increasing primary transmit power improves secrecy performance.

More small-cell transmitters enhance system security.

Backhaul reliability significantly impacts secrecy outage probability.

Abstract

In this paper, we investigate the secrecy performance of underlay cognitive small-cell radio network with unreliable backhaul connections. The secondary cognitive small-cell transmitters are connected to macro base station by wireless backhaul links. The small-cell network is sharing the same spectrum with the primary network ensuring that a desired outage probability constraint in the primary network is always satisfied. We propose an optimal transmitter selection (OTS) scheme for small-cell network to transfer information to the destination. The closed-form expression of secrecy outage probability are derived. Our result shows that increasing the primary transmitter's transmit power and the number of small-cell transmitter can improve the system performance. The backhaul reliability of secondary and the desired outage probability of the primary also have significant impact on the system.