Joint Scheduling and Power-Control for Delay Guarantees in Heterogeneous Cognitive Radios
Ahmed Ewaisha, Cihan Tepedelenlio\u{g}lu

TL;DR
This paper proposes two dynamic scheduling and power control policies for cognitive radio systems that guarantee delay constraints for secondary users despite heterogeneous interference channels, using Lyapunov optimization.
Contribution
Introduction of two novel Lyapunov-based policies that ensure delay guarantees under both instantaneous and long-term interference constraints in cognitive radios.
Findings
Policies are asymptotically delay optimal.
Outperform existing policies in simulations.
Robust to channel estimation errors.
Abstract
An uplink multi secondary user (SU) cognitive radio system having average delay constraints as well as an interference constraint to the primary user (PU) is considered. If the interference channels between the SUs and the PU are statistically heterogeneous due to the different physical locations of the different SUs, the SUs will experience different delay performances. This is because SUs located closer to the PU transmit with lower power levels. Two dynamic scheduling-and-power-allocation policies that can provide the required average delay guarantees to all SUs irrespective of their locations are proposed. The first policy solves the problem when the interference constraint is an instantaneous one, while the second is for problems with long-term average interference constraints. We show that although the average interference problem is an extension to the instantaneous interference…
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