IEEE 802.11中基于傳輸時間的接納控制算法研究
Performance Evaluation of Transmission Time Based Admission Control in IEEE 802.11
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摘要: 在IEEE 802.11無線局域網(wǎng)中引入基于傳輸時間的實時業(yè)務接納控制算法,當新申請的業(yè)務 加入系統(tǒng)后使系統(tǒng)總的傳輸時間超過預算時,拒絕該業(yè)務加入。對已接納的業(yè)務流按照令牌桶算法分配傳輸時間,并采用輪詢機制保證實時業(yè)務的服務質(zhì)量。通過拒絕接納過多的實時業(yè)務流,為非實時業(yè)務留出部分資源,避免了實時業(yè)務耗盡系統(tǒng)資源使非實時業(yè)務得不到服務的情況。
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關(guān)鍵詞:
- IEEE802.11; 服務質(zhì)量; 接納控制; 輪詢
Abstract: In this paper, a transmission time based admission control algorithm in IEEE 802.11 wireless LANs is proposed. When a new real-time flow requests to be admitted to the system, the Access Point (AP) evaluates whether the new flow will overrun the system transmission time budget. For the admitted flow, the AP adopts a token bucket to allocate the transmission time and polls the flow regularly, so the quality of service of the flow will be guaranteed. Furthermore, by means of excluding extra real-time flows, some wireless resources will be left for non-real-time services. The fairness of wireless resources sharing will be satisfied. -
ISO/IEC 8802-11: 1999(E) (ANSI/IEEE Std 802.11, 1999 Edition) Local and Metropolitan Area Networks-Specific Requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications.[2]Mangold S, Choi S, May P, et al.. IEEE 802.11e Wireless LAN for quality of service. Proc. of European Wireless 2002, Florence, Italy, Feb. 2002. http:∥www.ing.unipi.it/ew2002/.[3]Truong H L, Vannuccini G. Performance evaluation of the QoS enhanced IEEE 802.11e MAC layer. The 57th IEEE Semiannual Vehicular Technology Conference, 2003-Spring, Jeju, Korea,2003: 940-944.He Da-jiang, Shen C Q. Simulation study of IEEE 802.11e EDCF. The 57th IEEE Semiannual Vehicular Technology Conference, 2003-Spring, Jeju, Korea, 2003: 685-689.[4]IEEE P802.11. Wireless LANs Normative Text for TGe Consensus Proposal. Sept. 2002.http: ∥www.ieee802.org/11 /Documents/DocumcntHolder /2- 604.zip.[5]Kihong Park, Walter Willinger. Self-Similar Network Traffic and Performance Evaluation. New York, John Wiley Sons, Inc. 2000: 285-316.[6]IEEE Std 802.11b-1999 Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: Higher-Speed Physical Layer Extension in the 2.4 GHz Band. -
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