RSVP Extensions for Seamless Handoff with QoS Aware in Integrated WiMAX/WLAN Networks

• Main Authors: Shiao-Ming Wei, 魏曉明
• Other Authors: Cheng-Hsiung Hsieh
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/22366994499209777798

碩士 === 朝陽科技大學 === 資訊工程系碩士班 === 97 === In the near future, future network environments will be heterogeneous. The hybrid networks based on systems such as WiMAX (Worldwide Interoperability for Microwave Access) and WLAN (Wireless Local Access Networks) can combine their respective advantages on coverage and data rates. Therefore, it is a significant issue of how to provide seamless handoff for QoS connections in WLAN and WiMAX environments. However, in the wireless networks we use today, many mobile users still cannot obtain the network resources they need when employing the real-time services like voice, video conferences, video IP phone, and so forth while handoff occurs, and it causes a serious delay or even the break of the link. Thus, our approach is proposed to guarantee the QoS with QoS aware RSVP in heterogeneous wireless networks. The proposed scheme is based on QoS aware mobility architecture to guarantee a certain QoS in integrated WiMAX and WLAN networks. In this paper, the network selection is ignited by mobility of MS and pre-handoff is performed based on signal strength. On ther other hand, if the selection is triggered by the congestion, we will perform the handoff based on congestion controlling delay according to the QoS parameters. Our proposed scheme of resource pre-reservation can reduce the delay time of re-routing while handoff occurs and handoff blocking rate in the heterogeneous wireless networks efficiently.