排序方式： 共有126条查询结果，搜索用时 15 毫秒
41.
WiMAX无线宽带接入技术被认为是一项极具发展潜力的无线接入技术,已经成为通信领域的研究热点。WiMAX技术传输距离远、数据传输速率高、服务质量（QoS）机制完善、数据安全性更高、应用领域广阔,具有巨大市场发展前景。 相似文献
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王佳佳 《泰州职业技术学院学报》2012,12(4):38-41
文章分析了802.11i新标准下的无线局域网可能发生的分布式拒绝服务攻击,提出了一种解决方案用来检测并防御这种攻击,并且提出了惩罚不正确行为的矫正措施。在充分考虑了无线局域网中抵御拒绝服务攻击技术上和经济上的困难后,作者提出了一种利用Agent软件的解决方案,能够实现行为监视并且采取适当的措施。 相似文献
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ZHANG Wei SUN Jun LIU Jing ZHANG Hai-bin 《浙江大学学报(A卷英文版)》2007,8(1):18-23
INTRODUCTION IEEE 802.11e is designed to support multimedia applications. The main and mandatory scheme of IEEE 802.11e standard is enhanced distributed channel access (EDCA), which adopts service dif-ferentiation in configuration. The performance analysis of EDCA has been extensively studied by analytical or numerical means in recent years (Kong et al., 2004; Xiao, 2005; Zhu and Chlamtac, 2005; Hui and Devetsikiotis, 2005; Zhang et al., 2006). With the help of these works, perf… 相似文献
44.
A novel MAC mechanism to resolve 802.11 performance anomaly 总被引：1，自引：0，他引：1
CHENG Yan-hong LI Zhi-shu XING Jian-chuan ZHU Li 《浙江大学学报(A卷英文版)》2007,8(10):1573-1583
In the 802.11b networks, the guarantee of an equal long-run channel access probability causes performance anomaly in a multi-rate wireless cell. Much interest has been involved in this issue and many effective mechanisms have been proposed. The usual MAC layer solutions include the initial contention window adaptation, the maximum transfer unit size adaptation and the packet bursting. In this paper, we propose a novel approach which introduces a new parameter called the transmission prob- ability pt to the legacy protocol. By adjusting pt according to the transmission rate, the proposed scheme can solve the performance anomaly problem cleanly. Throughput analysis and performance evaluation show that our scheme achieves significant im- provement in the aggregate throughput and the fairness. 相似文献
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AbstractLibrarians have been seeking solutions to improve library user experience. The popularity of mobile devices leads to the increasing demand for reliable and efficient wireless communication in libraries. The City Tech librarians make an effort to improve Wi-Fi network to address such challenge. The Wi-Fi survey results indicate that students are dissatisfied with the library Wi-Fi access and hope to get better wireless communication for their mobile devices. To seek approaches to the improvement of Wi-Fi speed and reliability, the authors adopted NetSpot Pro loaded with the library building map to audit wireless network performance. The Wi-Fi site survey shows the library Wi-Fi network has not only weak Wi-Fi signal strength, but also experiences severe interference and overlapping channels. The study suggests that the Library and campus IT can enhance the Wi-Fi network performance by adding more wireless APs and optimizing the locations of existing APs, Wi-Fi network setting, and wireless connection procedure. By upgrading the CUNY Fiber Network and network improvement strategy, the Library can provide effective wireless communication for student learning and research, and ultimately give students memorable library experiences. 相似文献
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分析了IEEE802．15．4协议特点,运用NS2仿真软件分析了星型网的网络性能,重点分析信标使能模式和非信标使能模式的网络性能,并分析信标使能模式下信标级数的改变、数据传输方式的改变对端到端延时、平均分组递交率的影响,从而为实际应用802．15．4协议提供了参考． 相似文献
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IEEE802.21工作小组为解决异构网络互联问题提出了媒介独立切换(Media Independent Handover,MIH)方案。对WIFI、WIMAX异构网络融合进行了研究,为解决异构网络之间移动的平滑切换问题设计出一套切换流程和切换判决策略。通过仿真实验验证了其良好的性能。 相似文献
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文章从发展历史、规范及特性、应用领域、标准制定及发展展望四个方面对USB接口和IEEE 1394接口作出了比较,指出各自的优势及局限,以及未来的发展前景。 相似文献
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WiMAX技术具有传输距离远、传输速率高、容量大、信道宽度灵活、安全性高等特点。随着该技术被ITU批准为入第三代移动通信技术的最新标准,“无线城域网”的概念已经进入了“滨海新区信息化发展合作协议”。作者首先对IEEE802．16标准的内部结构进行介绍,又对利用该技术的组网方式进行了分析,最后得出WiMAX技术的应用在我国信息化的过程中具有良好的发展前景。 相似文献
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USB传输类型包括批量传输、同步传输、中断传输和控制传输,每种传输类型的传输速度、可靠性以及应用范围都不同.控制传输可靠性是最高的,但速度最慢;同步传输速度快,但可靠性低.IEEE1394接口的传输通过分层协议实现,分为物理层、链路层和业务层,它规范了一个三层协议集,将宿主系统经由串行总线与各外围设备的交互动作标准化. 相似文献