WLAN(Wireless Local Area Network,无线局域网络)因为安装灵活、使用便捷而受到广大网络用户的青睐,并且由于WLAN的传输速度不断提升,使其获得了更加广阔的发展前景。而目前构建WLAN的主流技术非IEEE的802.11标准系列莫属,这主要是因...WLAN(Wireless Local Area Network,无线局域网络)因为安装灵活、使用便捷而受到广大网络用户的青睐,并且由于WLAN的传输速度不断提升,使其获得了更加广阔的发展前景。而目前构建WLAN的主流技术非IEEE的802.11标准系列莫属,这主要是因为它具有安装快速、使用灵活、通信可靠、吞吐量相对较高,并且由于它在技术方面具有继承性,为日后的升级提供了便利。802.11n标准是一种能够有效增加无线网络吞吐量的最新的无线局域网标准,另外因为采用了智能天线技术,使得WLAN信号更加稳定。在本文中,笔者就基于802.11n标准的WLAN接入规划与设计的相关问题进行了分析和探讨。展开更多
Even though various wireless Net- work Access Technologies （NATs） with dif- ferent specifications and applications have been developed in the recent years, no single wireless technology alone can satisfy the any- ti...Even though various wireless Net- work Access Technologies （NATs） with dif- ferent specifications and applications have been developed in the recent years, no single wireless technology alone can satisfy the any- time, anywhere, and any service wire- less-access needs of mobile users. A real seamless wireless mobile environment is only realized by considering vertical and horizontal handoffs together. One of the major design issues in heterogeneous wireless networks is the support of Vertical Handoff （VHO）. VHO occurs when a multi-interface enabled mobile terminal changes its Point of Attachment （PoA） from one type of wireless access technology to another, while maintaining an active session. In this paper we present a novel multi-criteria VHO algorithm, which chooses the target NAT based on several factors such as user preferences, system parameters, and traf- tic-types with varying Quality of Service （QoS） requirements. Two modules i.e., VHO Neces- sity Estimation （VHONE） module and target NAT selection module, are designed. Both modules utilize several ＂weighted＂ users＇ and system＇s parameters. To improve the robust- ness of the proposed algorithm, the weighting system is designed based on the concept of fuzzy linguistic variables.展开更多
文摘WLAN(Wireless Local Area Network,无线局域网络)因为安装灵活、使用便捷而受到广大网络用户的青睐,并且由于WLAN的传输速度不断提升,使其获得了更加广阔的发展前景。而目前构建WLAN的主流技术非IEEE的802.11标准系列莫属,这主要是因为它具有安装快速、使用灵活、通信可靠、吞吐量相对较高,并且由于它在技术方面具有继承性,为日后的升级提供了便利。802.11n标准是一种能够有效增加无线网络吞吐量的最新的无线局域网标准,另外因为采用了智能天线技术,使得WLAN信号更加稳定。在本文中,笔者就基于802.11n标准的WLAN接入规划与设计的相关问题进行了分析和探讨。
文摘Even though various wireless Net- work Access Technologies （NATs） with dif- ferent specifications and applications have been developed in the recent years, no single wireless technology alone can satisfy the any- time, anywhere, and any service wire- less-access needs of mobile users. A real seamless wireless mobile environment is only realized by considering vertical and horizontal handoffs together. One of the major design issues in heterogeneous wireless networks is the support of Vertical Handoff （VHO）. VHO occurs when a multi-interface enabled mobile terminal changes its Point of Attachment （PoA） from one type of wireless access technology to another, while maintaining an active session. In this paper we present a novel multi-criteria VHO algorithm, which chooses the target NAT based on several factors such as user preferences, system parameters, and traf- tic-types with varying Quality of Service （QoS） requirements. Two modules i.e., VHO Neces- sity Estimation （VHONE） module and target NAT selection module, are designed. Both modules utilize several ＂weighted＂ users＇ and system＇s parameters. To improve the robust- ness of the proposed algorithm, the weighting system is designed based on the concept of fuzzy linguistic variables.
