Implementation of Cross-layer Fast-handoff Schemes for Inter-subnet Handoff in IEEE 802.11 WLANs

• Main Authors: Ming-Ta Yang, 楊明達
• Other Authors: Cheng-Shong Wu
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/14520926252963248740

碩士 === 國立中正大學 === 電機工程所 === 94 === Internet is changing rapidly in terms of its size, the number of users and the technology that it uses. Up to date, there are many RTP/UDP applications using by people, like Voice over IP (VoIP). Because of the popularity of portable devices and wireless LANs based on IEEE 802.11 standard have become popular and widely used recently, the mobility in wireless network environment become more important. There are two important issues to be addressed in order to support real-time service across wireless networks. One is high transmission data rate; the other is low handoff delay latency. In this thesis, we propose a cross-layer fast-handoff scheme in order to provide seamless mobility support to the mobile hosts in IEEE 802.11 wireless networks. We modify enhanced Inter-Access Point Protocol (IAPP) to fit real-time traffic and extend the function of an IEEE 802.11 Access Point to co-operate for cross-layer considerations. The link-layer handoff latency, network-layer handoff latency and application-layer handoff latency have been improved by our proposed scheme.