White Papers

Two-Phase Minislot Scheduling Algorithm for HFC QoS Services Provisioning

Overview Data-Over-Cable Service Interface Specifications v1.1 (DOCSIS v1.1), developed for data transmissions over Hybrid Fiber Coaxial (HFC) networks, defines five upstream services for supporting per-flow Quality of Services (QoS). The Cable Modem Termination System (CMTS) must periodically grant upstream transmission opportunities to the QoS flows based on their QoS parameters. However, packets may violate QoS requirements when several flows demand the same interval for transmission. This paper proposes a two-phase, i.e., the scheduling sequence determination phase and the minislot assignment phase, minislot scheduling algorithm to reduce the QoS violation rate. In the scheduling sequence determination phase, the flow whose packets are most unlikely to violate QoS is scheduled first.

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Publisher
National Chiao Tung University
File Format
PDF
Date Published
Oct 1, 2008
Format
White Papers
Topics
Quality of Service, Software Engineering

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