Two-phase minislot scheduling algorithm for HFC QoS services provisioning

Wei Ming Yin*, Chia Jen Wu, Ying-Dar Lin

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

3 Scopus citations


Data-Over-Cable Service Interface Specifications v1.1 (DOCSIS v1.1) 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. This study proposes a two-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. In the minislot assignment phase, the scheduler allocates to a flow the available interval where the likelihood of packet violation is minimum. Simulation results demonstrate that our scheduling algorithm can reduce the QoS violation rate by 80% ∼ 35% over that of the first-come-first-serve-random-selection algorithm and increase the utilization by 25% as well.

Original languageEnglish
Number of pages5
StatePublished - 2001
EventIEEE Global Telecommunicatins Conference GLOBECOM'01 - San Antonio, TX, United States
Duration: 25 Nov 200129 Nov 2001


ConferenceIEEE Global Telecommunicatins Conference GLOBECOM'01
Country/TerritoryUnited States
CitySan Antonio, TX


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