- 學位論文
在車載隨意行動網路之網路移動協定
Network Mobility Protocol for Vehicular Ad Hoc Networks
摘要
本篇論文探討在車載高速移動環境下移動管理。網路移動管理目的有效降低換手複雜度且行動裝置維持連線。當使用者離開原有的基地台移動至新的基地台時，有可能造成即時訊息中斷如: VoIP, 行動電視 (Mobile TV) 等。尤其是在車載高速移動環境中，車輛移動速度快更容易造成換手時間延遲加長及封包遺失大增。為了克服上述問題，我們提出在車載隨意行動網路之網路移動協定。在高速公路上，每輛車高速移動且具固定方向，透過快速取得網路位址 (IP)方式，可經由同向車道或對向車道取得並且利用前方車輛協助後方車輛進行預先註冊流程，降低換手延遲時間及維護連至網際網路連線。模擬結果顯示我們所提的方法可以降低換手產生延遲及封包遺失率
並列摘要
The goal of the network mobility (NEMO) management is to effectively reduce the complexity of handoff procedure and keep the mobile devices connecting to the Internet. When users are going to leave the old subnet and enter the new subnet, the handoff procedure is executed on the mobile devices and it may break off the real time service, such as VoIP or mobile TV, due to the mobility of mobile devices. Since the vehicle is moving so fast that it may cause the handoff and packet loss problems. Both of the problems will lower down the throughput of the network. To overcome these problems, we propose a novel NEMO protocol for vehicular ad hoc network (VANET). In freeway, since every car is moving in a fixed direction with high moving speed, the car adopting our protocol can acquire IP address from the VANET through vehicle to vehicle communications. The vehicle can rely on the assistance of the front vehicle to execute the pre-handoff procedure or it may acquire its new IP address through multi-hop relays from the car on the lanes of the same or opposite direction and thus reduces the handoff delay and maintain the connectivity to the Internet. Simulation results have shown that the proposed scheme is able to reduce both handoff delay and packet loss rate.