設計一個適合車間通訊網路的繞徑協定

Abstract

在無線網路中，AODV是個具有低額外負擔優點的通訊協定，但是由於on-demand的運作模式，所以有延遲較高和較低傳輸量的缺點。 在此我們藉由GPS的協助，將AODV用於車間通訊，以便於改進原本AODV的缺點，其中包含了三個部分的提升：(i)改正原本在AODV中之缺點 (ii)對於繞徑的重建提出新的選擇標準以便減低AODV的負擔 (iii)為了要避免由於無線鏈結中斷所造成的低傳輸量和延遲，提出了備份繞徑的程序。有別於以往的相關作法，在此進行的模擬case都是由專業的車流模擬器所產生的，由最後的效能審定中顯示出這個協定是較原本的AODV更適合車間通訊。

In the mobile ad-hoc network, Ad hoc On-demand Distance Vector (AODV) is a famous routing protocol for its low overhead. According to the feature of on-demand operation, it experiences high delay and may obtain lower throughput. Here we propose an enhancement of AODV, GPS-support AODV, for the inter-vehicle communication. There are three parts: (i) To verify the deficiencies of AODV and provide solutions for them. (ii) To introduce a new metric for the route construction and further reduce the overhead of AODV. (iii) To avoid the throughput hole and delay from the link break till the route repair, we offer a mechanism called backup route construction to achieve smooth route switch. In contrast with previous works, our simulation cases are generated by vehicles flow simulator rather than random way point; the performance evaluation shows that our proposed GPS-support AODV works better than the original AODV and is more suitable for the inter-vehicle communication.