Secrecy Performance of Small-Cell Networks with Transmitter Selection and Unreliable Backhaul under Spectrum Sharing Environment

TL;DR

This paper analyzes the secrecy performance of small-cell cognitive radio networks sharing spectrum with primary users, proposing multiple transmitter selection schemes and examining the effects of backhaul reliability and power on security metrics.

Contribution

It introduces three sub-optimal and one optimal transmitter selection schemes with closed-form secrecy performance expressions for small-cell networks under spectrum sharing.

Findings

Increasing primary transmitter power improves secrecy performance.

More small-cell transmitters enhance security metrics.

Backhaul unreliability and primary QoS constraints significantly affect secrecy outcomes.

Abstract

We investigate the secrecy performance of an underlay small-cell cognitive radio network under unreliable backhaul connections. The small-cell network shares the same spectrum with the primary network, ensuring that a desired outage probability constraint is always met in the primary network. {To improve the security of the small-cell cognitive network, we propose three sub-optimal small-cell transmitter selection schemes,} namely sub-optimal transmitter selection, minimal interference selection, and minimal eavesdropping selection. Closed-form expressions of the non-zero secrecy rate, secrecy outage probability, and ergodic secrecy capacity are provided for the schemes along with asymptotic expressions. {We also propose an optimal selection scheme and compare performances with the sub-optimal selection schemes.} {Computable expressions for the non-zero secrecy rate and secrecy outage probability are presented for the optimal selection scheme.} Our results show that by increasing the primary transmitter's power and the number of small-cell transmitters, the system performance improves. The selection scheme, the backhaul reliability, and the primary user quality-of-service constraint also have a significant impact on secrecy performance.