本研究欲提出針對台灣無線頻譜700Mhz無線麥克風使用者與第四代行動通信(LTE)業者共存之干擾解決方案。

國家通訊委員會為提升頻譜效率，將部分免執照無線麥克風使用之700Mhz頻段重新規劃為行動寬頻上網服務下行頻段。無線麥克風使用者不得對訊號造成影響，並須忍受干擾。此問題源自台灣電信監理機關雙頭馬車並行制度。頻譜規劃單位視該頻段為行動寬頻服務使用權優先，然而無線麥克風並不具備頻率感知的功能，無法主動避開干擾或避免造成干擾；另一方面，電信監管單位亦難以對無法預測的干擾進行開罰，僅能提供其他可用頻段供無線麥克風使用者遷移。因此，大量採用無線麥克風之廣播業者必須面臨兩種選擇：接受高昂升級設備成本；或是忍受無法收訊風險，繼續與LTE服務共存。

本研究首先分析類似之原無線麥克風頻段頻率重劃政策，如美國、英國與澳洲等，並比較其與NCC政策異同。其次，本研究蒐集頻譜次級交易市場以及頻譜租用相關資料，並修改之，使其符合無線麥克風裝置無法感知頻率，卻必須與行動寬頻通訊服務共用的情境。

對於解決方案，我們提出尖離峰定價與頻寬縮減機制作，並以序列賽局及程式模擬推估廣播業者最終選擇。研究結論為廣播業者在轉換成本高昂條件下，將選擇忍受干擾。但在轉換成本不再高昂，或是新聞預期收益較高時，廣播業者將選擇以尖離峰定價為主之頻寬縮減機制。

此外，本研究提供國家規管單位得以在現行法律下，透過新技術與商業模式，以行政命令快速作出有瑕疵頻譜規劃的修正方式，甚至未來頻譜規劃參考。國家規管單位更可在保護文創產業同時，提高頻譜資源使用效率。對LTE業者而言，閒置頻譜創造次級首用的收入，並降低其他射頻設備共用頻率的干擾風險，。廣播業者亦得益於研究提出機制。廣播業者付出較低的頻譜租賃費用，而非一次性更換設備費用，並享有良好收音品質。研究所提出之尖離峰頻譜租用機制可供政府未來放寬特定事業間頻率使用權限制相關政策參考，並與匯流法精神相呼應。

Abstract
The research purpose of the study aims to propose a solution to the interference between wireless microphone users and a LTE operator, as a compensation to the coexisting situation of the services. Pursuing a better spectrum efficiency, he national communication committee (NCC) has re-farmed part of the 700MHz radio band, which was used by the license-exempted wireless microphone users, for LTE download carriers. As secondary users, wireless microphone users are asked to do no harm to the LTE operator signal, and have to endure the interference cause by LTE.
The double act of Taiwan NRA in telecommunication is responsible for the flawed auction. The spectrum planning authority, as known as the Minister of transportation and communication(MOTC), viewed the operator as a primary user in that radio band. However, the wireless microphones are not cognitive devices that avoid causing interference. In the other side, the regulatory authority, as known as the National Communication Committee(NCC), has no effective method to deal with the unpredictable interferences. NCC could only propose other possible locations for those wireless microphone users. Therefore, the broadcasters who invested a lot in wireless microphones and involved in tremendous amount of the devices, would only have two ways to go. Either to accept the sorely high cost of upgrading equipment or re-investments, or to accept the risk of bad reception.
The research first analysis and comparison similar re-farming policies of license-exempted wireless microphone radio bands from USA, UK and Australia. Second, the research collected the models of spectrum secondary markets, and modified them due
II
to few of them are either technologically or perfectly legitimate to the case of wireless microphone and LTE coexistence. The modification is mainly focus on the difference of wireless microphone to a cognitive service.
Nevertheless, this research proposed a third option as bandwidth reduction and peak and non-peak time pricing mechanism. This research also applied game theory and simulation for finding the equilibrium. The conclusion is that the broadcasters would finally accept the bad reception because of the high cost of upgrading. But they would also consider the peak and non-peak pricing based bandwidth reduction, whenever the upgrading cost is relatively low or the value of news event is relatively high.
Besides, the research shows national regulation authorities (NRAs) a way of fixing flowed policies through administrative orders and business models. The NRAs could increase the spectrum efficiency and protect the cultural and creative industry all at once. To a LTE operator, the mechanism proposed could create value, reduce risk of bad network quality, the cost is relatively low. Instead of the high re-investment in the same equipment, to pay for the spectrum leasing fee and get a guaranteed reception, the broadcasters are also benefited from the mechanism proposed. Generally speaking, the spectrum leasing mechanism proposed in the research is consistent with the concept of digital convergence. Namely, to loosen control of spectrum usage on certain industries.

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