| 摘要(英) |
The design of QoS in WiMAX provides better quality in real-time services over wireless network. The new scheduling service, named ERT-VR, in IEEE 802.16e standard provides the jitter guarantee parameter to enhance the quality of real time applications.
Unlike the fixed network, which only considers the instantaneous traffic and queue condition, the factors of multipath and doppler in radio environment will affect the transmission quality. Therefore, the channel condition shall be considered for the scheduling scheme in IEEE 802.16e network. The IEEE 802.16e network is a kind of the wireless technologies, the SNR may be changed quickly by time and place especially in mobile condition. In this paper, we propose a cross-layer scheduling in order to feedback from the information of PHY layer quickly and accurately to the MAC layer.
The E-model is a common way to evaluate whether the data network is well performed in carring VoIP traffic. In E-model, the important element of equipment impairment factor is jitter. And, the IEEE 802.16e standard also regards jitter as one of the important factors in ERT-VR scheduling service. In this paper, a jitter guanarteed scheduling scheme for ERT-VR service is proposed. During the simulation, the UGS scheduling service is assumed to be unidirectional real-time service such as radio service, or provide fixed bandwidth service such as T1 service. And, the RT-VR scheduling service is regarded as an important role in video transmission such MPEG. The ERT-VR scheduling service will carry VoIP service in IEEE 802.16e network.
Our simulation results show that all of the above scheduling types can meet appropriate qualities in accordance with their characteristics and QoS requirements and the bandwidth utilization can also be improved. |
| 參考文獻 |
[1] “IEEE Std 802.16-2004” , IEEE Computer Society, IEEE Microwave Theory and Techniques Society, IEEE Standard, 1 October 2004.
[2] Understanding WiMAX and 3G for Portable/Mobile Broadband Wireless, Technical White Paper, Intel
[3] Arunabha Ghosh and David R. Wolter, Jeffrey G. Andrews and Runhua Chen,“Broadband Wireless Access with WiMax/8O2.16: Current Performance Benchmarks and Future Potential” , IEEE Communications Magazine February 2005 , p129-136.
[4] Taesoo Kwon,Howon Lee,Sik Choi,Juyeop Kim,Dong-Ho Cho ,“Design and Implementation of a Simulator Based on a Cross-Layer Protocol between MAC and PHY Layers in a WiBro Compatible IEEE 802.16e OFDMA System”, Communications Magazine, IEEE ; Dec. 2005 , p136 -146.
[5] “IEEE Std 802.16e-2005 and IEEE Std 802.16-2004/Cor1-2005” , IEEE Computer Society, IEEE Microwave Theory and Techniques Society , IEEE Standard, 28 February 2006.
[6] Howon Lee, Taesoo Kwon, Dong-Ho Cho, Geunhwi Limt , Yong Chang,t” Performance Analysis of Scheduling Algorithmsfor VoIP Services in IEEE 802.16e Systems”,Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd ,7-10 May 2006, p 1231-1235.
[7] ITU-T Recommendations G.107, “The E-Model, a Computational Model for Use in Transmission Planning,” December 1998.
[8] R. G. Cole and J. H. Rosenbluth ,“Voice over IP performance monitoring”, ACM SIGCOMM Computer Communication Review, Vol. 31, Issue 2 , pp. 9 – 24, April 2001.
[9] Qingwen Liu , Xin Wang , Giannakis, G.B. ,“A Cross-Layer Scheduling Algorithm With QoS Support in Wireless Networks“, Vehicular Technology, IEEE Transactions on , May 2006, p839 - 847
[10] FEC Performance With ARQ and Adaptive Burst Profile Selection,2001
[11] Robert Novak, Mo-Han Fong, Peiying Zhu, Gamini Senarath, Dean
Kitchener, Wen Tong, Hang Zhang, David Steer, Derek Yu, Mark Naden,
Jianglei Ma, Sang-Youb Kim ,“Proposed Text for Evaluation Methodology and Key Criteria for P802.16m”, IEEE 802.16 Task Group m,Mar,2007. |
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