摘要
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 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 transmission 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, thus achieving the capability of 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 transmission. This scheduling strategy is used to satisfy bandwidth requirements of higher priority traffics. A set of simulation scenarios is conducted by using OPNET to demonstrate the performance efficiency of the proposed scheme.
原文 | English |
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頁面 | 3894-3898 |
頁數 | 5 |
出版狀態 | Published - 2003 |
事件 | IEEE Global Telecommunications Conference GLOBECOM'03 - San Francisco, CA, United States 持續時間: 2003 12月 1 → 2003 12月 5 |
Other
Other | IEEE Global Telecommunications Conference GLOBECOM'03 |
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國家/地區 | United States |
城市 | San Francisco, CA |
期間 | 03-12-01 → 03-12-05 |
All Science Journal Classification (ASJC) codes
- 電氣與電子工程
- 全球和行星變化