- 學位論文
無線網狀網路中使用位置快取的移動性管理機制
WMM: A Mobility Management Mechanism using Location Cache for Wireless Mesh Network
摘要
無線網狀網路（WMN）是第四代高速行動網路的主要技術之一。在無線網狀網路中，網狀後置節點（mesh backhaul）負責介接無線網狀網路與外部網路，而網狀存取節點（mesh access points）負責提供網路存取服務給使用者的行動裝置（mobile stations）。這兩種節點合稱為網狀節點（mesh nodes）。網狀節點的位置是固定的，並且透過無線網狀鏈結互相溝通。由於使用者的移動，所以需要移動性管理機制以使得無線網狀網路能有效率並且正確地傳送封包資料給行動裝置。我們針對無線網狀網路提出移動性管理機制，稱為WMM （Wireless mesh Mobility Management）。WMM使用位置快取的方式，即網狀節點在繞送封包時將封包中的行動裝置位置資訊記錄到快取中。所以移動性管理可以在網狀節點繞送封包的同時完成。我們將WMM實作到實際系統上，並且推導數學模型與使用電腦模擬實驗的方式以研究WMM的效能。我們將WMM的信令負荷與繞送封包的負荷與其他現存的移動性管理機制做比較。我們的研究顯示WMM的額外負荷較低並且容易實作。
並列摘要
Wireless Mesh Network (WMN) is one of the major technologies for the 4G high-speed mobile network. In the WMN, a mesh backhaul connects the WMN with Internet, and mesh access points (MAPs) provide wireless network access service to mobile stations (MSs). The mesh nodes (MNs) (including mesh backhaul and MAPs) are stationary and connected through the wireless mesh links. Due to MS mobility in WMN, Mobility Management (MM) is required to efficiently and correctly route the packets to MSs in WMN. We propose an MM mechanism named Wireless mesh Mobility Management (WMM). The WMM adopts the location cache approach where MNs cache the MS's location information while routing the data for the MS. The MM is exercised when MNs routes the packets. We implement the WMM and conduct an analytical model and simulation experiments to investigate the performance of WMM. We compare the signaling and routing cost between WMM and other existing MM protocols. Our study shows that WMM has light overhead and low implementation cost.