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Adaptive Delay Threshold-based Priority Queueing Scheme for Packet Scheduling in Mobile Broadband Wireless Access System  

Ku, Jin-Mo (고려대학교 정보통신대학 전파공학과)
Kim, Sung-Kyung (고려대학교 정보통신대학 전파공학과)
Kim, Tae-Wan (고려대학교 정보통신대학 전파공학과)
Kim, Jae-Hoon (SK텔레콤 네트워크 연구원)
Kang, Chung-G. (고려대학교 정보통신대학 전파공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.3A, 2007 , pp. 261-270 More about this Journal
Abstract
The Delay Threshold-based Priority Queueing (DTPQ) scheme has been shown useful for scheduling both real-time (RT) and non-real-time (NRT) service traffic in mobile broadband wireless access (MBWA) systems. The overall system capacity can be maximized subject to their QoS requirement by the DTPQ scheme, which takes the urgency of the RT service into account only when their head-of-line (HOL) packet delays exceed a given delay threshold. In practice, the optimum delay threshold must be configured under the varying service scenarios and a corresponding traffic load, e.g., the number of RT and NRTusers in the system. In this paper, we propose an adaptive version of DTPQ scheme, which updates the delay threshold by taking the urgency and channel conditions of RT service users into account. By evaluating the proposed approach in an orthogonal frequency division multiple access/time division duplex (OFDM/TDD)-based broadband mobile access system, it has been found that our adaptive scheme significantly improves the system capacity as compared to the existing DTPQ scheme with a fixed delay threshold.
Keywords
Packet scheduling; DTPQ; Adaptive delay threshold; MBWA; RT&NRT integral service;
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  • Reference
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