車載網路在未來社會將會越來越普及，車載網路資料傳遞技術，不僅能連接上網提供多元化的網路應用，甚至提供行車安全性服務。然而車載網路的網路品質不是十分理想，乃因存在著許多不確定因素，因為網路品質低，所以需要更完善的機制來提升車載網路品質。如車輛間速度不一，車輛間的距離變化相當頻繁，若因此而需要重新建立連線路徑是相當浪費傳輸時間並影響到傳輸的頻寛。本篇論文提出Cookie-Cooperative Automatic Repeat request (CCARQ) 的機制是針對這類型的間歇性斷線做修補，其方法是透過MAC (Media Access Control) 層協助網路層 (Network Layer) 的轉送。因為車輛是行駛在道路上，所建立的車載網路拓樸是沿著道路佈建，所以當連線路徑中斷時，周圍鄰近的車輛將是最好的替代選擇。本模擬將比較CCARQ, AODV與Bypass-AODV，透過 packet delivery ratio、end to end delay、control overhead及goodput為效能指標，調整在不同的hop數、車輛數目及車輛速度來觀察效能表現。模擬結果顯示packet delivery ratio增加14.6%、end to end delay減少41.3%、control overhead減少38%。 / VANET (Vehicular Ad-hoc Network) is expected to become more popular in the near future. VANET transmission technology will offer not only bountiful network applications but also safety driving information. Network quality of VANET is usually bad due to speed variation, high mobility, driver behavior variation, traffic density, traffic signal, environment complexity and swarm effect, et al. In this research, we propose a Cookie-Cooperative Automatic Repeat reQues (CCARQ) to enhance network performance by repairing intermittent broken connection. As mentioned above, speed variation will dynamically change the distances of car-to-car frequently and result in broken connections. Each re-establishment of broken connections will waste transmission time and reduce transmission bandwidth. The proposed CCARQ mechanism will help network layer transmission through MAC layer. Since VANET’s topology deployed along with road, the surrounded cars will be the best candidate to be a substitute car when a broken connection occurs. The performance indices are set to varied hops, varied speed and number of cars. Simulations show that CCARQ outperforms AODV and Bypass-AODV in packet delivery ratio by 14.6% increase, end to end delay by 41.3% decrease and control overhead by 38% decrease.