THE STUDY ON VIRTUAL-LAN OF IEEE 802.1q FOR MOBILE AD-HOC NETWORKS

• Main Authors: Cheng-Hsing Tsai, 蔡正興
• Other Authors: Yueh-Min Huang
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/3642e6

碩士 === 國立成功大學 === 工學院工程管理專班 === 92 === 　　Ad hoc networks are constructed by mobile nodes with wireless connections – that is a wireless network without infrastructure or centralized management. Mainly﹐it provides limitless users with the ability to construct wireless networks at any time. Every node has routing capabilities﹐with the ability to discover and maintain routing information. Since the networks topology may be changed by the mobile nodes﹐selecting an appropriate routing protocol is crucial to find a communications route for the mobile node. Thus﹐routing protocols take on an important role. 　　Many researchers have devoted to develope routing protocols in ad hoc networks with limited bandwidth. Besides﹐the consideration of backup routes and multiple routes have been also proposed. 　　One of the most attractive features of the virtual local area network (VLAN) is the capability to group users from different physical LAN segments into a single broadcast domain. VLANs﹐thus﹐facilitate easy administration of logical groups of stations that can communicate as if they were on the same LAN. In addition﹐Traffic between VLANs is restricted. This in turn limits the propagation of multicast and broadcast traffic between VLANs. These two features make the VLAN more rewarding in a wireless environment where the bandwidth is quite limited and constant moving of the mobile stations are highly anticipated. 　　In this thesis﹐we explore the possibility of combining the concept of multi-hop wireless technique with the VLAN to extend the VLAN scope toward the always on” network environment﹐including area where there is little/no communication infrastructure﹐or the existing infrastructure is damaged after a hurricane or earthquake. For supporting such an integration of ad hoc networks with Mobile VLAN (MVLAN)﹐we present in this paper the design of multi-hop MVLAN member tracking mechanism and the frame forwarding protocol. In summary﹐the achievement of multi-hop MVLAN is twofold. First﹐through the MVLAN technique﹐the transparent handoff of mobile stations can be achieved and the network bandwidth can be efficiently and effectively utilized. Second﹐through the ad hoc networking technique﹐the VLAN scope can be scaled to include areas where the communication infrastructure is insufficient.