台灣於2020年完成第一波5G釋照中，中頻段僅釋放3300-3570MHz，總計270MHz，未來隨著需求上升，勢必需要釋出第二波頻譜。由於我國C頻段3.57-4.2 GHz上，尚存在衛星通信以及點對點微波固定通信業者，經過盤點受到影響的利害關係人有衛星廣播電視事業、有線廣播電視系統經營者、無線電視事業、衛星固定通信業務經營者及其使用者、接收 FSS 之星級旅館業者、電信事業、固定通信及點對點微波業者、政府機關等八類。
本研究參考其他開放中頻段供5G使用國家的頻段及作法，將目前受到影響的利害關係人分成四類：政府、電信業者、點對點微波業者以及FSS現有使用者，並歸納成以下5種可能之候選方案。方案一保留現有ST-2 轉頻器，並預留40 MHz保護帶，其餘頻譜3740-4200MHz僅供行動通信使用。方案二與方案一相同，不同的是，其餘頻譜3740-4200MHz以共享方式，讓 5G、FSS 與固定通信及點對點微波共同使用。方案三讓5G、衛星、固定通信及點對點微波等共享整個 3.57-4.2GHz 頻段。方案四從3740-4200MHz 規劃合適頻寬及頻段供5G專用，其餘則保留給FSS與固定通信及點對點微波使用，方案五將整個3.57-4.2GHz頻段規劃為僅供行動通信使用。
為了找出哪一種方案整體效益最高，本研究利用財務分析中的淨現值法，來驗證在不同的方案中所得到的利益以及受到的損害，綜合比較整體的效益。經過實證分析後發現，方案五是所有方案中獲益最高的。政府在方案五不僅能獲得最多的頻譜標金，來發展國家建設，電信業者也不需要與其他利害關係人一起共用頻譜，因此就效率面來說，5G 頻譜在方案五能達到最快成熟且淋漓盡致的運用，不僅擁有最大的頻寬也不須與他人共用，能透過龐大的頻譜，將 5G 技術發展至巔峰之最，徹底的發揮 5G的特性。

關鍵字：第五代行動通訊，頻譜整備方案，財務分析、頻譜拍賣、 利害關係人

SUMMARY
In the first wave of 5G spectrum release completed by Taiwan in 2020, only 3300-3570MHz is released in the mid-band. If the second wave of spectrum is to be released in the future, Taiwan’s telecom regulator can follow other countries and consider frequency bands such as n77 and n78.
There are still satellite communication and point-to-point microwave fixed communication operators in Taiwan's C-band 3.57-4.2 GHz. Therefore, this study refers to the frequency bands and practices that have been opened in other countries, as well as the relevant stakeholders of Taiwan's current use of the frequency spectrum. Then we propose 5 possible scenarios or solutions for Taiwan’s next phase release of 5G.
First scenario is to keep the existing ST-2 transponders and reserve a 40 MHz guard band, and the remaining 3740-4200 MHz spectrum is only used for mobile communications. Second scenario unlike scenario one in that the rest of the spectrum 3740-4200MHz is shared, allowing 5G, FSS and point-to-point microwave to be used together. The third is to let 5G, satellite, fixed communication and point-to-point microwave share the entire 3.57-4.2GHz frequency band. The fourth, 3740-4200MHz is planned to have suitable bandwidth and frequency band for 5G exclusive use, and the rest are reserved for FSS, fixed communication and point-to-point microwave. Finally, the entire 3.57-4.2GHz band is planned for mobile communications only.
This study uses the net present value method in financial analysis to compare the performance of the proposed solutions. After empirical analysis, we found that solution 5 is the most profitable in all schemes. In solution 5, the government can not only obtain the most spectrum bids to develop the country, but also telecom operators do not need to share the spectrum with other stakeholders.

Keywords: Fifth Generation Mobile Communication, spectrum preparation plan, financial analysis, stakeholders, spectrum auction

Baker, A., Brogan, P., Carare, O., Copeland, N., DeGraba, P., Kauffman, S., . . . Sullivan, S. (2020). Economics at the FCC 2019–2020: Spectrum Policy, Universal Service, Inmate Calling Services, and Telehealth. Review of Industrial Organization, 57(4), 827-858.
Bruder, J., Carlo, J., Gurney, J., & Gorman, J. (2003). IEEE standard for letter designations for radar-frequency bands. IEEE Aerospace & Electronic Systems Society, 1-3.
Danso, A., Adomako, S., Lartey, T., Amankwah-Amoah, J., & Owusu-Yirenkyi, D. (2020). Stakeholder integration, environmental sustainability orientation and financial performance. Journal of business research, 119, 652-662.
Erunkulu, O. O., Zungeru, A. M., Lebekwe, C. K., Mosalaosi, M., & Chuma, J. M. (2021). 5G mobile communication applications: a survey and comparison of use cases. IEEE Access, 9, 97251-97295.
FCC. (2020a). Auction 105: 3.5 GHz Band. Retrieved from https://www.fcc.gov/auction/105/factsheet
FCC. (2020b). Expanding Flexible Use of the 3.7 to 4.2 GHz Band. Retrieved from https://docs.fcc.gov/public/attachments/FCC-20-22A1.pdf
FCC. (2020c). Federal Communications Commission. Retrieved from https://docs.fcc.gov/public/attachments/FCC-20-110A1.pdf
FCC. (2021a). Auction 107: 3.7 GHz Service. Retrieved from https://www.fcc.gov/auction/107/factsheet
FCC. (2021b). AUCTION OF FLEXIBLE-USE SERVICE LICENSES IN THE 3.45–3.55 GHz BAND FOR NEXT-GENERATION WIRELESS SERVICES COMMENT SOUGHT ON COMPETITIVE BIDDING PROCEDURES FOR AUCTION 110. Retrieved from https://docs.fcc.gov/public/attachments/FCC-21-33A1.pdf
FCC. (2021c). FCC OPENS 100 MEGAHERTZ OF MID-BAND SPECTRUM FOR 5G. Retrieved from https://docs.fcc.gov/public/attachments/DOC-370860A1.pdf
Frédéric PUJOL, C. M., Basile CARLE and Santiago REMIS. (2021). 5G Observatory Quarterly Report 12. Retrieved from https://5gobservatory.eu/wp-content/uploads/2021/07/90013-5G-Observatory-Quarterly-report-12_v1.0.pdf
Frieden, R. (2020). The evolving 5G case study in United States unilateral spectrum planning and policy. Telecommunications Policy, 44(9), 102011.
Group, t. M. o. A. W. (2021). APT REPORT ON MITIGATION MEASURES TO IMPROVE SHARING AND COMPATIBILITY BETWEEN 4G-LTE AND 5G-NR SYSTEMS AND OTHER SYSTEMS OPERATING IN PORTIONS OF 3300 – 4200 MHZ,.
GSMA. (2021). WRC-23-IMT-Agenda-Items. Retrieved from https://www.gsma.com/spectrum/wp-content/uploads/2021/04/WRC-23-IMT-Agenda-Items.pdf
Hattab, G., Moorut, P., Visotsky, E., Cudak, M., & Ghosh, A. (2018). Interference analysis of the coexistence of 5G cellular networks with satellite earth stations in 3.7-4.2 GHz. Paper presented at the 2018 IEEE International Conference on Communications Workshops (ICC Workshops).
Hu, F., Chen, B., & Zhu, K. (2018). Full spectrum sharing in cognitive radio networks toward 5G: A survey. IEEE Access, 6, 15754-15776.
Institute, L. I. (2020a). 47 CFR § 1.946 - Construction and coverage requirements. Retrieved from https://www.law.cornell.edu/cfr/text/47/1.946#d
Institute, L. I. (2020b). 47 CFR § 96.25 - Priority access licenses. Retrieved from https://www.law.cornell.edu/cfr/text/47/96.25
ITU-R, I. (2020). R15-WRC19PREPWORK contribution 12: WRC-19 agenda item 1.13–IMT-2020 between 24.25 and 86 GHz. In.
Johansson, K., Furuskar, A., Karlsson, P., & Zander, J. (2004). Relation between base station characteristics and cost structure in cellular systems. Paper presented at the 2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No. 04TH8754).
Kułacz, Ł., Kryszkiewicz, P., Kliks, A., Bogucka, H., Ojaniemi, J., Paavola, J., . . . Kokkinen, H. (2019). Coordinated Spectrum Allocation and Coexistence Management in CBRS-SAS Wireless Networks. IEEE Access, 7, 139294-139316.
Lagunas, E., Tsinos, C. G., Sharma, S. K., & Chatzinotas, S. (2020). 5G cellular and fixed satellite service spectrum coexistence in C-band. IEEE Access, 8, 72078-72094.
Levary, R. R., & Han, D. (1995). Choosing a technological forecasting method. Institute of Industrial management, 37(31), 14–18.
Massaro, M., & Beltrán, F. (2020). Will 5G lead to more spectrum sharing? Discussing recent developments of the LSA and the CBRS spectrum sharing frameworks. Telecommunications Policy, 44(7), 101973.
Matinmikko-Blue, M., Yrjölä, S., Seppänen, V., Ahokangas, P., Hämmäinen, H., & Latva-Aho, M. (2019). Analysis of spectrum valuation elements for local 5G networks: Case study of 3.5-GHz band. IEEE Transactions on Cognitive Communications and Networking, 5(3), 741-753.
Mitchell, R. K., Van Buren III, H. J., Greenwood, M., & Freeman, R. E. (2015). Stakeholder inclusion and accounting for stakeholders. In: Wiley Online Library.
Mun, K. (2018). OnGo: New shared spectrum enables flexible indoor and outdoor mobile solutions and new business models. White Paper, Mobile Experts, Inc., 1-9.
Ofcom. (2019). Enabling Wireless Innovation through Local Licensing. Retrieved from https://www.ofcom.org.uk/__data/assets/pdf_file/0033/157884/enabling-wireless-innovation-through-local-licensing.pdf
Ofcom. (2020a). Award of the 700 Mhz and 3.6-3.8 Ghz spectrum bands. Retrieved from https://www.ofcom.org.uk/__data/assets/pdf_file/0033/157884/enabling-wireless-innovation-through-local-licensing.pdf
Ofcom. (2020b). Supporting the UK’s wireless future. Retrieved from https://www.ofcom.org.uk/__data/assets/pdf_file/0027/208773/spectrum-strategy-consultation.pdf
Ofcom. (2021). Award of 700 MHz and 3.6–3.8 GHz Spectrum by Auction.
Ofcom. (2017). 5G Spectrum Access at 26 GHz and Update on Bands Above 30 GHz.
Oughton, E. J., Frias, Z., van der Gaast, S., & van der Berg, R. (2019). Assessing the capacity, coverage and cost of 5G infrastructure strategies: Analysis of the Netherlands. Telematics and Informatics, 37, 50-69.
Parker, J. R., Flood, I. D., & Carter, G. D. (2021). Adjacent channel compatibility between IMT and ubiquitous FSS Earth Stations in the 3.4–3.8 GHz frequency band. Wireless Networks, 27(2), 1103-1110.
Peisa, J., Persson, P., Parkvall, S., Dahlman, E., Grovlen, A., Hoymann, C., & Gerstenberger, D. (2020). 5G evolution: 3GPP releases 16 & 17 overview. . Ericsson Technology Review, 6, 2-13.
Rana, M. S., Prasad, R., Yoon, H., & Hwang, J. (2020). Opportunity cost of spectrum for mobile communications: Evaluation of spectrum prices in Bangladesh. Telecommunications Policy, 44(3), 101925.
內政部警政署. (2021). 警消微波網路系統移頻計畫.
余序江, 許志義, & 陳澤義. (1998). 科技管理導論: 科技預測與規劃: 五南.
直彦, 総. 総. 電. 移. 荻. (2019). 第５世代移動通信システム（５Ｇ）の今と将来展望. Retrieved from https://www.soumu.go.jp/main_content/000633132.pdf
財團法人電信技術中心. (2020). 3.5 GHz 中頻段改善措施建置與潛在干擾評估及處理作業計畫. Retrieved from https://www.grb.gov.tw/search/planDetail?id=13015729
國家通訊傳播委員會. (2020a). 因應政策調整或停用無線電頻率所涉補償費用之鑑價評估委託研究採購案. Retrieved from https://www.ncc.gov.tw/chinese/files/20091/5138_45046_200914_1.pdf
國家通訊傳播委員會. (2020b). 行動通信頻率使用費計算基. Retrieved from https://law.moj.gov.tw/LawClass/LawGetFile.ashx?FileId=0000276218&lan=C
國家通訊傳播委員會. (2021). 行動寬頻專用電信網路（4.8-4.9GHz）政策諮詢文件. Retrieved from https://www.ncc.gov.tw/chinese/files/21041/54_45934_210413_1.pdf
楊青燕. (2011). 海外直播衛星電視初探-以華人衛星電視為例. Retrieved from https://hdl.handle.net/11296/azm9qq
葉至誠, 社會學, & 葉立誠. (2002). 研究方法與論文寫作: 商鼎文化.