Wi-Fi Direct 多點跳躍式網路之設計與實作

Abstract

隨著無線技術的發展與精進，行動手持裝置已成為日常生活中的一部份。手持裝置在沒有基礎網路(Infrastructure)的情況下，可形成一個無線隨意網路(ad hoc network)以達成多點傳送。然而目前在IEEE 802.11的規格中無線隨意網路只支援802.11b規格，資料傳輸量也較其它新型IEEE 802.11規格來的小。 本論文提出了一套WoMA(Wi-Fi Direct of Measurement Awareness routing protocol)系統，包含讓系統中的成員可以進行多點跳躍的機制與適用於Wi-Fi Direct上的路由機制：多點跳躍機制可自動偵測系統成員的加入與離開、更新路由資訊並允許遠端節點透過網路再次連回系統內與成員互動；而路由機制可控管及量測系統中的路由資訊，讓傳送端的系統成員透過路徑請求與回覆得知抵達目的地的路徑，並提供量測的頻寬資訊予傳送端選擇路徑。實驗結果顯示本系統能夠有效的提供Wi-Fi Direct多點跳躍，並且讓遠端成員透過網路連回系統中。

The advent of mobile handset is becoming an intrinsic part of everyday life and has gained immense popularity in recent years Handsets can form a multi-hop ad hoc network without infrastructure. However, only 802.11b supports ad hoc mode among 802.11 prtocols, which has lower data rate compare to the other alternatives. This study proposes WoMA, a Wi-Fi Direct of Measurement Awareness routing protocol system. WoMA consists of a multi hop mechanism for system members and a routing protocol for Wi-Fi Direct. The multi hop mechanism detects the actions of members automatically including join, leave and route update. Furthermore, this mechanism allows remote peer joining the ad hoc network through internet and interacting with other members. The routing protocol collects the routing information, which and allows sender retrieving the route to destination through route request and route reply. The routing protocol also provides members with estimated bandwidth for route selection. The experimental results confirm that mobile devices form a Wi-Fi Direct multi-hop network. Moreover, devices rejoin WoMA system which utilizes multi-interfaces of handsets.