A Context Aware Handoff and Connection Management Scheme for Mobile Multicast in Heterogeneous Networks

• Main Authors: Wu-Shian Lee, 李武憲
• Other Authors: Cheng-song Wu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/28800112859882946967

碩士 === 國立中正大學 === 通訊工程研究所 === 96 === With the progress and development of wireless technology, mobile devices now support a variety of wireless protocols, allowing them to connect to 3G mobile and Wi-Fi wireless networks. With the addition of more wireless network bandwidth, multicast multimedia services have been applied from wired networks to also wireless networks. Therefore we can see that future mobile devices shall support multiple wireless technologies and allow users to receive multicast multimedia transmissions through homogeneous or heterogeneous networks while they are moving. In order for mobile devices to roam through wireless networks and receive multicast packets from different base stations, we have designed a context-aware based handoff scheme for mobile devices. This scheme includes system discovery, handoff decision, and handoff execution operations. Mobile devices shall receive multicast multimedia services by choosing the most suitable wireless protocol to connect to the wireless network, depending on in what environment the mobile device is in. When the mobile device leaves this network, it may perform vertical or horizontal handoff operations to switch connection to a heterogeneous wireless network or homogeneous wireless network, respectively. In addition to enable mobile devices to receive multicast multimedia services in heterogeneous networks, we have designed a mobility management mechanism. This management mechanism shall allow mobile devices to receive multicast transmissions through Multicast Agents (MA), that shall be of assistance to the foreign network, if IP multicast mobility is not supported there.