目前無線資源逐漸用盡，各個組織紛紛改善原本網路型態，使其達到更高的 throughput，但此方法仍在相同頻帶競爭，對於無線資源越來越少的問題並不會 有太大的改進。而隨著各個國家紛紛關閉無線電視基地台，電視白頻帶將會越來 越多，因此，使用電視白頻帶之無線資源，才能有效解決無線資源匱乏的問題。
為了模擬使用電視白頻帶之裝置及其特性，在現今兩套標準 IEEE 802.22 及 ECMA-392 中，特別挑選 ECMA-392 通訊協定做設計，並在 EstiNet 上根據該通 訊協定設計出 ECMA-392 之節點。該節點之 MAC 層和 PHY 層分別處理及模擬 ECMA-392 中定義之 MAC 和 PHY 層的各個程序，MAC 層負責模擬進入網路、
建立 group、group merge、channel SCAN、channel reservation、channel 撤離、及 data transfer；而 PHY 層則模擬將資料送出至空氣中，並偵測 PU 訊號使 MAC 適 時觸發撤離 channel 的程序。
相信在未來若能將 CR 感知技術發展更加純熟，即可不必侷限於電視白頻帶，
如此一來，目前在電視白頻帶上之設計，將是未來的跳板，讓純熟的 CR 感知技 術應用在其他頻帶，將有機會能大幅提升無線資源之使用率。
參考文獻
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