近幾年，MANET的通訊已變成是一種廣泛的趨勢，VANET是其中的一種特例。VANET 是由車輛以及路邊裝置所組成，各裝置會不定時以廣播方式告知已發生及將要發生的事件，並幫忙轉傳別人的訊息。其中異常訊息有分惡意與非惡意的，IDS 糸統可阻絕惡意的破壞，但對於系統本身的錯誤有時無法預防。由於大部份的訊息傳播是採廣播方式，為了減少無謂訊息以增加散播效能，我們提出了VANET中的合作式散播與偵試系統，主要關鍵的預測因素減少了初始時的異常訊息並提昇了整體散播的效能。

In these years, applications for MANET communication become the extensive trends. Vehicular Ad-Hoc Network (VANET) is one special case of it. In VANET, it consists of on-board unit (OBU) and road-side unit (RSU). Each unit sends events to notify other units occurred and on-going events related to it and forward packets from other units. The anomaly events may be malicious or rational. Sometimes, rational events are caused by hardware issues that can’t generate proper events to others. IDS technology detects the malicious event but can’t figure out rational events sometimes. Most VANET events are sent by broadcast packets, it will take much resources of network transmission. To improve the data dissemination performance, we propose cooperative detection system to for a VANET. The major forecast factor reduces the anomaly packets in initial. The anomaly packets were eliminated that reduce the broadcast packets will improve the dissemination performance.

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