Effective Capacity of Cognitive Radio Links: Accessing Primary Feedback Erroneously

TL;DR

This paper investigates how erroneous access to primary feedback affects the effective capacity of a secondary cognitive radio link, proposing a three power level scheme to balance secondary performance and primary reliability under delay constraints.

Contribution

It introduces a three power level scheme for secondary users utilizing primary feedback with errors, analyzing the tradeoff between secondary capacity and primary reliability.

Findings

Increased feedback error leads to higher interference to primary users.

Secondary effective capacity decreases as feedback access errors increase.

The proposed scheme balances secondary throughput and primary success rate.

Abstract

We study the performance of a cognitive system modeled by one secondary and one primary link and operating under statistical quality of service (QoS) delay constraints. We analyze the effective capacity (EC) to quantify the secondary user (SU) performance under delay constraints. The SU intends to maximize the benefit of the feedback messages on the primary link to reduce SU interference for primary user (PU) and makes opportunistic use of the channel to transmit his packets. We assume that SU has erroneous access to feedback information of PU. We propose a three power level scheme and study the tradeoff between degradation in EC of SU and reliability of PU defined as the success rate of the transmitted packets. Our analysis shows that increase in error in feedback access causes more interference to PU and packet success rate decreases correspondingly.