Effectiveness and issues of congestion control in 802.11g wireless LANs

The current paper presents a collection of experimental data portraying the performance achieved in the wireless setting by several TCP-friendly congestion controls recently proposed in literature. This work is partly motivated by the consideration that the majority of the analytical results in this area are validated by simulation, rather than by field tests. Examining these algorithms in real environments can help verify their actual effectiveness over the wireless Internet. To reach such goal, two representative controls among the so-called window-based TCP-friendly schemes have been implemented, namely, the General Additive Increase Multiplicative Decrease (GAIMD) strategy, and the SQuare RooT (SQRT) binomial control; the most representative algorithm among rate-based controls, the TCP Friendly Rate Control (TFRC), has also been considered. Their TCP-fairness and smoothness have been comprehensively evaluated in an IEEE 802.11g Wireless Local Area Network (WLAN). The obtained results show that the GAIMD and SQRT strategies reveal non-negligible scalability and smoothness problems, that markedly limit their performance. It is empirically demonstrated that their “optimal” increase/decrease rules, based on TCP-Reno analytical model, cannot guarantee an adequate performance when GAIMD and SQRT compete with TCP-Sack, a de facto standard for current TCP implementations. TFRC is demonstrated to occasionally behave bewildering: properly tuning one of its congestion control parameters and enhancing the algorithm with a flow-control mechanism result in a definitely fairer share of bandwidth with concurrent TCP flows. Michele Borri received the M.Sc. degree in Computer Engineering from the University of Modena and Reggio Emilia in the academic year 2001–2002 and took a specialisation in Telecommunication Engineering in 2002. His professional activity is currently balanced between researching at the University of Modena and Reggio Emilia, and consulting as a system engineer and network architect. His research interests focus on congestion control and multimedia services in next generation Internet. Michele Borri has been participating to national research projects promoted by the Italian National Research Council (CNR). Maurizio Casoni is Associate Professor in Telecommunications at the University of Modena and Reggio Emilia. He graduated with honors in Electrical Engineering at the University of Bologna in 1991, with a grant by Telecom Italia and received the Ph.D. degree also in Electrical Engineering from the University of Bologna, in 1995. In 1995 he was with the Computer Science Department at Washington University in St. Louis, MO, as a research fellow where he worked on ATM broadband switching architectures. He has studied ATM broadband switching architectures and Clos architectures for the design of large photonic switches in the framework of the European Projects ATMOS and KEOPS. He has also investigated the performance of 3rd generation UMTS systems. His current research interests deal with Optical Networking, mainly focusing on Optical Burst Switching, and Satellite Networks. He currently holds the course of Interconnection Systems for undergraduate students and the course of Switching Systems for graduate students of Telecommunications Engineering. Maria Luisa Merani is currently an associate professor of Telecommunication Networks at the University of Modena and Reggio Emilia, Department of Information Engineering. She is an IEEE Senior member and has served on the Technical Program Committees of several major communication conferences (IEEE ICC, IEEE Globecom, IEEE VTC, APCC). In 2005 she has been technical program cochair of the second IEEE International Symposium in Wireless Communication Systems. In 2007 she will be the Wireless Symposium chair of IEEE Globecom. At present she is involved in research on congestion control for next generation Internet and on multicast video streaming. Her most recent research interests are related to the area of radio communications, with emphasis on performance evaluation of mobile radio systems, 3G data networking and transport solutions for optical networks. Maria Luisa Merani received both her M.Sc. (summa cum laude) and Ph.D. in electrical engineering from the University of Bologna, Italy, in the academic years 1985/86 and 1991/92, respectively. In 1992 she spent one year at the Computer Science Department of the University of California in Los Angeles, CA, USA.     

远程微波通讯系统在天津港施工中的应用

通过实际应用阐述了无线网络技术和在施工中的具体应用,通过无线网络来改善施工企业分布偏远、网络条件差的网络环境,为施工企业的信息化铺平网络链路。     

有线数字电视长距离光纤传输中的色散补偿

有线数字电视信号在长距离光纤传输中存在色散问题,色散使系统的CSO指标劣化,适当地进行色散补偿可以大幅提升CSO指标,降低误码率(BER).     

A Novel Event Model for Performance Analysis of IEEE 802.11 DCF

After considering the memory effect among series events occurring on the channel, we propose a novel event model to analyze the channel status more precisely. The memory effect is caused by the backoff freezing regulation of IEEE 802.11 Distributed coordination function （DCF）, which has been ignored before and thus resulted in the inaccurate evaluation of the network performance. Based on our new event model, the network performance of IEEE 802.11 DCF, including throughput, packet delay distribution and energy efficiency is analyzed. Simulation results show that our model is highly accurate.     

IEEE1588时钟同步协议在数字化变电站中的应用探讨

针对IEC61850对变电站内不同应用层面的同步精度要求,比较了硬接线同步方式、简单网络时间协议(SNTP)和IEEE1588精确时间协议(PTP)的优缺点.介绍了IEEE1588时间协议的时钟类型以及它们之间的关系,详细分析了IEEE1588时间同步的基本原理.应用目前硬件支持条件,论证了在数字化变电站中应用IEEE...     

人体局域网的MAC层分析与研究

在分析人体局域网的背景和研究现状的基础上,指出MAC协议是影响人体局域网整体性能的关键技术之一.总结分析MAC层协议的研究现状,并对IEEE802.15.6标准中定义的MAC协议进行详细的探讨,进而分析了BAN的网络拓扑结构.最后,对人体局域网MAC协议研究中面临的挑战进行讨论,给出MAC协议未来的研究方向.     

利用互联网资源进行通信领域技术的检索

检索是专利审查过程中的重要环节,检索数据库的选择与使用直接决定了检索效率和准确性.互联网资源的合理使用对于专利申请的检索有着重要的意义,结合通信领域的三个实际案例,分别介绍了IEEE论文库、3GPP协议库以及patentics语义检索数据库的使用方法以及特点.以便申请人利用免费的互联网资源能够针对专利申请文件进行更便捷、更准确和更全面地检索.     

IEEE802.16d下一种改进的打孔卷积编码算法及FPGA实现

分析了信道编码在正交频分复用（OFDM）系统中的作用,重点研究了卷积编码原理和具体实现。参考IEEE802.16d标准,结合现有多码速率编码算法,提出了一种新的打孔算法,仿真实验表明该算法降低了系统的误码率;可编程逻辑器件（FPGA）上的硬件在线调试表明实测结果和算法仿真结果吻合,且在提高可靠性的同时,节省了硬件资源。     

EEFA:高能效的IEEE 802.11N帧聚合调度算法(英文)

Packet size is restricted due to the error-prone wireless channel which drops the network energy utilization.Furthermore,the frequent packet retransmissions also lead to energy waste.In order to improve the energy efficiency of wireless networks and save the energy of wireless devices,EEFA(Energy Efficiency Frame Aggregation),a frame aggregation based energy-efficient scheduling algorithm for IEEE 802.1 In wireless network,is proposed.EEFA changes the size of aggregated frame dynamically according to the frame error rate,so as to ensure the data transmission and retransmissions completed during the TXOP and reduce energy consumption of channel contention.NS2simulation results show that EEFA algorithm achieves better performance than the original frame-aggregation algorithm.