Dynamical quality of service (QoS) support for DOCSIS HFC networks

Wen-Kuang Kuo; Sunil Kumar; C.-C. Jay Kuo

doi:10.1117/12.434424

26 July 2001 Dynamical quality of service (QoS) support for DOCSIS HFC networks

Wen-Kuang Kuo, Sunil Kumar, C.-C. Jay Kuo

Proceedings Volume 4527, Technologies, Protocols, and Services for Next-Generation Internet; (2001) https://doi.org/10.1117/12.434424
Event: ITCom 2001: International Symposium on the Convergence of IT and Communications, 2001, Denver, CO, United States

Abstract

The Data Over Cable Service Interface Specifications (DOCSIS) of the Multimedia Cable Network System (MCNS) organization intends to support IP traffics over HFC (hybrid fiber/coax) networks with significantly higher data rates than analog modems and Integrated Service Digital Network (ISDN) links. The availability of high speed-access enables the delivery of high quality audio, video and interactive services. To support quality-of-service (QoS) for such multimedia applications, it is important for HFC networks to provide effective medium access and traffic scheduling mechanisms. In this work, we consider an HFC network that has a shared upstream channel for transmissions from stations assigned with different service priorities to the headend. We first present a multilevel priority collision resolution scheme with adaptive contention window adjustment. The proposed collision resolution scheme separates and resolves collisions for different classes of critically delay-sensitive and best effort traffics, thereby, achieving the capability for preemptive priorities. To enhance the performance of the proposed scheme, we adopt a novel methodology in which the headend dynamically selects the optimal backoff window size according to the estimate of the number of contending stations for each priority class. A traffic scheduling policy with multiple priority queues is also employed in the headend to schedule data transmissions. This scheduling strategy is used to satisfy bandwidth requirements for higher priority traffics. Simulations are conducted by using OPNET. We present a set of simulation scenarios to demonstrate the performance efficiency of the proposed scheme.

Citation Download Citation

Wen-Kuang Kuo, Sunil Kumar, and C.-C. Jay Kuo "Dynamical quality of service (QoS) support for DOCSIS HFC networks", Proc. SPIE 4527, Technologies, Protocols, and Services for Next-Generation Internet, (26 July 2001); https://doi.org/10.1117/12.434424

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Curium

Networks

Multimedia

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Binary data

Computer simulations

Analog electronics

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