在耐延遲網路(Delay Tolerant Network)中，因節點之間的高移動性、連接的不確定性環境嚴苛限制，採用Store-And-Forward 訊息傳輸的模式提供一個可接受的網路表現。常見的路由協定可分為機會路由、基於預測的路由以及調度路由，然而這些路由協定使用在市區環境中，有些許不足的地方，因此我們提出適用在市區封包轉發策略。
我們提出的以公車亭為基礎之耐延遲車載網路封包轉發策略，是在市區環境中建立一個以公車亭為基礎的資料傳送架構，包含汽車、公車、公車站、公車轉運站四種節點。我們建立節點與節點相遇時資料傳送規則，例如汽車與汽車相遇、汽車與公車相遇、公車與公車站相遇、公車與公車轉運站相遇、公車轉運站與公車相遇、公車站與汽車相遇、汽車與目的地相遇時各自有不同的資料傳送判斷與限制。
實驗結果也證明所提出的演算法，除了可以有效地減少延遲傳送時間並提高訊息成功傳送率，及在各節點有限的緩衝區大小下，我們的封包轉發策略有著最突出的效能。 / In Delay Tolerant Networks (DTNs), there does not exist an end-to-end path due to intermittent connectivity and high node mobility. Messages are stored for a period of time at network nodes and are conveyed hop-by-hop to the destination. The current DTN routing protocols can be summarized into three categories: opportunistic, prediction-based and scheduling protocols. However, these routing protocols have some deficiencies and are not specifically focused on the urban areas.
Based on the characteristics of urban areas, we proposed a kiosk based packet forwarding strategy for vehicular delay tolerant networks. We established the rules of data transmission when one node contacts other nodes. More specifically, Car-to-Car, Car-to-Bus, Bus-to-Bus stop, Bus-to-Bus transfer station, Bus transfer station-to-Bus, Bus stop-to-Car ,Car-to-Destination contacts, have different judgments and restrictions for data forwarding.
The simulation results demonstrate that we proposed packet forwarding strategy would reduce the delivery delay, and improve the successful delivery rate. Especially with limited buffer and little overhead, our proposed strategy has the most prominent performance.
| Identifer | oai:union.ndltd.org:CHENGCHI/G0098971017 |
| Creators | 陳維偵, Chen, Wei Chen |
| Publisher | 國立政治大學 |
| Source Sets | National Chengchi University Libraries |
| Language | 中文 |
| Detected Language | English |
| Type | text |
| Rights | Copyright © nccu library on behalf of the copyright holders |
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