대한산업공학회지 (Journal of Korean Institute of Industrial Engineers)

  • 제29권2호
  • /
  • Pages.150-156
  • /
  • 2003
  • /
  • 1225-0988(pISSN)
  • /
  • 2234-6457(eISSN)
대한산업공학회 (Korean Institute of Industrial Engineers)
권호 표지

무선랜 시스템에서의 하향 우선 실시간 음성 트래픽 스케줄링

Downlink-First Scheduling of Real-Time Voice Traffic in IEEE 802.11 Wireless LANs

  • 정동운 (한국과학기술원 산업공학과) ;
  • 이채영 (한국과학기술원 산업공학과)
  • 발행 : 2003.06.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

The IEEE 802.11 MAC (Media Access Control) Protocol supports two modes of operation, a random access mode for nonreal-time data applications processed by Distributed Coordinated Function (DCF), and a polling mode for real-time applications served by Point Coordinated Function (PCF). It is known that the standard IEEE 802.11 is insufficient to serve real-time traffic. To provide Quality of Service (QoS) of real-time traffic, we propose the Downlink-first scheduling with Earliest Due Date (EDD) in Contention Free Period (CFP) with suitable admission control. The capacity and deadline violation probability of the proposed system is analyzed and compared to the standard pair system of downlink and uplink. Analytical and simulation results show that the proposed scheme is remarkably efficient in view of the deadline violation probability.

키워드

참고문헌

  1. B. P. Crow, I. Widjaja, L. G. Kim and P. T. Sakai, (1997), IEEE 802.11 wireless local area networks, IEEE Communications Magazine, 35,116-126
  2. D. Minoli and E. Minoli, (1998), Delivering voice over IP networks, New York Wiley
  3. F. Cali, M. Conti. and E. Gregori, (2000), Dynamic tuning of the IEEE 802.11 protocol to achieve a theoretical throughput limit. IEEE/ACM trans. Networking, 8(6), 785-799
  4. H. S. Chhaya and S. Gupta, (1997), Performance modeling of asynchronous data transfer methods of IEEE 802.11 MAC protocol, Wireless Networks,. 3, 217-234
  5. Ju-Hee Lee and Chae Y. Lee, (2002), Scheduling of Real-time and Nonreal-time Traffics in IEEE 802.11 Wireless LAN, submitted to the Journal of the Korean OR/MS society
  6. M. Shreedhar and G. Varghese, (1996), Efficient Fair Queuing Using Deficit Round Robin, IEEE/ACM Trans. On Networking 4(3),376-85
  7. R. Ranasinghe, (2001), Distributed contention-free traffic scheduling in IEEE 802.11 multimedia networks, Selected Papers, 10th IEEE Workshop on Local and Metropolitan Area Net works, 18-28
  8. S. Bodamer, (2002), A new scheduling mechanism to provide relative differentiation for real-time IP traffic, GIOBECOM'00, 1,646-650
  9. Srinivas Kandala, Partho Mishra, FrankHowley and Rolf Devegt, Matthew Sherman, Bob Meier and Menzo Wentik. (2002) Nonnative Text for Tge Consensus Proposal. IEEE 802.11-02/604r0