853 research outputs found
Dynamic Scheduling for Delay Guarantees for Heterogeneous Cognitive Radio Users
We study an uplink multi secondary user (SU) system having statistical delay
constraints, and an average interference constraint to the primary user (PU).
SUs with heterogeneous interference channel statistics, to the PU, experience
heterogeneous delay performances since SUs causing low interference are
scheduled more frequently than those causing high interference. We propose a
scheduling algorithm that can provide arbitrary average delay guarantees to SUs
irrespective of their statistical channel qualities. We derive the algorithm
using the Lyapunov technique and show that it yields bounded queues and satisfy
the interference constraints. Using simulations, we show its superiority over
the Max-Weight algorithm.Comment: Asilomar 2015. arXiv admin note: text overlap with arXiv:1602.0801
Optimal Power Control and Scheduling under Hard Deadline Constraints for Continuous Fading Channels
We consider a joint scheduling-and-power-allocation problem of a downlink
cellular system. The system consists of two groups of users: real-time (RT) and
non-real-time (NRT) users. Given an average power constraint on the base
station, the problem is to find an algorithm that satisfies the RT hard
deadline constraint and NRT queue stability constraint. We propose a
sum-rate-maximizing algorithm that satisfies these constraints. We also show,
through simulations, that the proposed algorithm has an average complexity that
is close-to-linear in the number of RT users. The power allocation policy in
the proposed algorithm has a closed-form expression for the two groups of
users. However, interestingly, the power policy of the RT users differ in
structure from that of the NRT users. We also show the superiority of the
proposed algorithms over existing approaches using extensive simulations.Comment: Submitted to Asilomar 2017. arXiv admin note: text overlap with
arXiv:1612.0832
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