A Look-Ahead Scheduler to Provide Proportional Delay Differentiation in the Wireless Network with a Multi-State Link

Arthur CHANG  Yuan-Cheng LAI 

Publication
IEICE TRANSACTIONS on Communications  Vol.E87-B  No.8  pp.2281-2289
Publication Date: 2004/08/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Network
Keyword: 
quality of services (QoS),  proportional delay differentiation,  wireless network,  waiting time priority, 

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Summary: 
The issue of guaranteeing Quality of Services (QoS) in a network has emerged in recent years. The Proportional Delay Differentiated Model has been presented to provide the predictable and controllable queueing delay differentiation for different classes of connections. However, most related works have focused on providing this model for a wired network. This study proposes a novel scheduler to provide proportional delay differentiation in a wireless network that includes a multi-state link. This scheduler, Look-ahead Waiting-Time Priority (LWTP), offers proportional delay differentiation and a low queueing delay, by adapting to the location-dependent capacity of the wireless link and solving the head-of-line (HOL) blocking problem. The simulation results demonstrate that the LWTP scheduler actually achieves delay ratios much closer to the target delay proportion between classes and yields smaller queueing delays than past schedulers.