| 摘要(英) |
In order to response the developing of internet multimedia and application, Broadband Wireless Access (BWA) systems are also developed quickly. IEEE 802.16 WiMAX is one of the hottest new technologies in recent years. For the sake of serving different kinds of connections, IEEE 802.16 WiMAX classifies data connections into five types. These types are Unsolicited Grant Service (UGS), Real-time Polling Service (rtPS), Non-real-time Polling Service (nrtPS), and Best Effort (BE). Each type of connections has its own corresponding quality of service (QoS) parameters. In a WiMAX base station (BS), the scheduler is responsible for that which packet should be sent first and how the bandwidth would be allocated. Thus the network provider can change the scheduling algorithm in the scheduler according to policies. If a scheduler uses an improper scheduling algorithm, the scheduler may waste bandwidth or lower the quality of service of connections.
This thesis proposes a channel-aware QoS scheduler for IEEE 802.16 wireless metropolitan networks. This scheduler mainly considers WiMAX QoS parameter: the Maximum Latency. It is able to guarantee the Maximum Latency of rtPS connections. In addition to QoS parameter, the proposed scheduler also considers the channel condition of each connection and first serves the connections which have better channel condition. Thus the proposed scheduler can maximize the total throughput of the network. Simulation results also show that the proposed scheduler not only guarantees the QoS but also has better total network throughput than other schedulers.
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| 參考文獻 |
[1] IEEE Std 802.16-2004, “IEEE Standard for Local and metropolitan area networks Part 16: Air Interface for Fixed Broadband Wireless Access Systems”, Oct. 2004.
[2] IEEE Std 802.16e-2005, “IEEE Standard for Local and metropolitan area networks Part 16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems - Amendment 2: Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands and Corrigendum 1”, Feb. 2006.
[3] IEEE Std 802.16-2009, “IEEE Standard for Local and metropolitan area networks Part 16: Air Interface for Broadband Wireless Access Systems”, May, 2009.
[4] The Network Simulator – NS-2, http://nsnam.isi.edu/nsnam/
[5] WiMAX module for the ns-2 simulator, August 2008, http://www.lrc.ic.unicamp.br/wimax_ns2/
[6] Chakchai So-In, Raj Jain and Abdel-Karim Tamimi “Scheduling in IEEE 802.16e Mobile WiMAX Networks: Key Issues and a Survey”, IEEE Journal on Selected Areas in Communications, vol. 27, no. 2, pp.156-171, Feb. 2009
[7] J. F. Borin and N. L. S. Fonseca, “Scheduler for IEEE 802.16 networks”, IEEE Communications Letters, vol. 12, no. 4, pp. 274-276, April 2008.
[8] C. Cicconetti, L. Lenzini, placeE. Mingozzi, and C. Eklund, “Quality of service support in IEEE 802.16 networks”, IEEE Networks, vol. 20, pp. 50-55, April 2006.
[9] Chakchai So-In, Raj Jain and Abdel-Karim Tamimi, “A Deficit Round Robin with Fragmentation Scheduler for IEEE 802.16e Mobile WiMAX”, Sarnoff Symposium, 2009. SARNOFF '09. IEEE, pp. 1-7, 2009.
[10] K. R. Raghu, Sanjay K. Bose and Maode Ma, “Queue based scheduling for IEEE 802.16 wireless broadband”, Information, Communications & Signal Processing, pp. 1-5, 2007.
[11] Po-Chun Ting, Chia-Yu Yu, Chilamkurti N., Wang Tung-Hsien and Ce-Kuen Shieh “A Proposed RED-based Scheduling Scheme for QoS in WiMAX Networks”, Wireless Pervasive Computing, pp. 1-5, 2009.
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