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第七章、 結論與未來研究方向
大型天然災害發生後的 72 小時為黃金救援期，災情傳遞、資源調度以及救 援工作的相互協調仰賴於有效運作的通訊系統，本篇論文主旨在針對應急蜂巢式 行動通訊網路（Contingency Cellular Network ,CCN）設計群組通訊模式，目的在 於使災區內使用者能透過群組通訊系統，進行溝通協調以提高救災效率。
本研究設計由群組通訊系統（Agency Communication System ,ACS）負責管 控群組資料，並以 CCN 元件 Emulated Controller Module（EC Module）作為通 訊處理核心，利用基地台閒置頻寬資源，提供群組呼叫與通話接續之功能。CCN 網內之通訊群組使用手機向系統註冊，由系統指配群組聯絡代表號，當災區內使 用者有通訊需求時，即可利用手機直撥代表號，將通話請求訊息經由行動基地台 向系統發送，透過群組資料比對程序呼叫通訊對象以建立通話連線。
在群組代表號設計方面，為使用戶能快速撥打、方便記憶，以簡碼代替繁雜 的行動號碼並符合 E.164 電信網路編碼規則，具有緊急識別之效用。在通訊處理 設計方面，透過解析群組聯絡號碼快速對映群組成員資料，並依使用者目前所在 位置篩選出鄰近之通訊對象，且為了避免緊急程度較高的通訊受頻寬資源有限的 影響而無法順利撥接成功，特將群組通訊分級，給予不同的通話優先權及品質控 制。
為驗證系統設計之可行性，本研究以 IEEE802.11 Wi-Fi 無線網路環境建置模 擬系統，初期採用集中式架構而系統內部控制訊息及語音資料以 UDP 數據封包 格式傳送，使用者端以 Android 平台手機搭配 VoIP 軟體模擬手機與系統連線以 進行通話，未來將以分散式建構本系統。
最後，本文針對模擬系統註冊處理、通話管理及語音傳送品質等三部份，透
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過一連串實驗以觀察本系統在實際運作上所達之效能。以 100 位使用者進行之實 驗，平均註冊時間為 2.2 秒，通話連線建立時間為 5.2 秒，可見系統在使用者註 冊及通話連線處理上，即使同時面對大量使用者需求，仍可在短時間予以回應。
在通話語音品質方面，通話數在 30 通以下，MED 值維持在一般 VoIP 使用者可 容許的範圍（300~400 ms）之內，但當線上通話數目持續增加時，話務流量亦隨 之增加，系統話務轉送效能到達瓶頸，語音品質開始下降，未來可針對此部份予 以改進，將群組通訊系統加入話務分散機制或搭配群組通話等級動態配置頻道資 源等設計，讓系統在能維持通話品質水準的情況下，提高系統容量以滿足災區內 更多使用者的通訊需求。
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