第五章 結論與展望
5.2 未來研究方向
由於本研究僅只是在初步證明同時連上多個接取網路有省電的可能性，因此 尚有許多議題留待更進一步的討論。而相關的系統參數設定亦會隨著接取網路技 術的變革而有所調整，例如 ADSL 正逐漸朝向以 PON 為基礎的 FTTx 或長距離的 Ethernet 演進；同時無線接取網路環境也將因 LTE 的加入而有所不同。這些都是未 來接續本論文的研究者應考慮的議題。
而對於 ISP 業者而言，要完成本論文提出的省電架構，尚須增加許多設備資 本支出(CapEx)，雖然合理推測節省下來的半數電費營運成本(OpEx)可輕易的填補 該項支出，但本部分仍須經過業者依據自身的狀況來精算。除此之外，於 3.5 節亦 提到一些在實做上會遇到的困難，例如 PSR 各部功能的整合以及 NMS 額外的功 能等等，本論文雖已提供少許可供參考的解決方式，詳細的技術細節對業者依然 十分有挑戰性。
而站在學術的角度，由於本論文的使用者流量模式（User Profiles）較為接近 真實網路流量行為而非簡化後的數學模型（例如 Poisson Arrival Process 與
Exponential Service Time），且提出的架構尚未在數學上完整的定義，因此無法事先 預測省電成效，也無法根據嚴謹的數學計算求得最佳解。目前本論文提出的演算 法乃是直觀解（heuristics），相關參數的數值亦缺乏選取的機制或計算，雖然已具 有顯著的省電成效，但架構的適應性與發展性仍然需要使用數學推導來驗證。而 這些議題都十分具有學術研究的價值，期許未來能以本論文為基石繼續更進一步 研究。
附錄一 參數定義與設定值
接取網路k對該 PSR 之 Routing Priority_ _ PSR 可接受之最大 Blocking Probability
參數名稱 參數意義
表附錄 1-2 模擬參數設定值
參數名稱 參數類型 情境一 情境二 情境三
附錄二 情境二模擬結果之詳細數值
0.17491% 40.5373% 58.1839% 22.4433% 2.3262
∙ 10
系統平均
系統平均
參考文獻
[1] M. Pickavet et al., ”Worldwide Energy Needs for ICT: the Rise of Power-Aware Networking,” in Proc. Of IEEE ANTS Conference, Bombay, India, Dec. 2008.
[2] C. Panarello, A. Lombardo, G. Schembra, L. Chiaraviglio, and M. Mellia, “Energy saving and network performance: a trade-off approach,” in 1st International
Conference on Energy-Efficient Computing and Networking (e-Energy ’10), pp. 41–
50, ACM, Apr. 2010.
[3] J. Chabarek, J. Sommers, P. Barford, C. Estan, D. Tsiang, S. Wright, "Power awareness in network design and routing," in Proc. of IEEE INFOCOM, 2008.
[4] S. Antonakopoulos, S. Fortune and L. Zhang, “Power-aware Routing with
Rate-adaptive Network Elements,” in Proc. of IEEE Globecom 2010 Workshop on Green Communications, Miami, Dec. 2010.
[5] 中華民國行政院，數位匯流發展方案(2010-2015 年)，2010 年 12 月公布。
[6] T. Starr, J. M. Cioffi, and P. Silverman, Understanding Digital Subscriber Line Technology. Englewood Cliffs, NJ: Prentice-Hall, 1998.
[7] ITU Recommendation G997.1, “Physical layer management for digital subscriber line (DSL) transceivers,” ITU, Apr. 2009.
[8] Agilent Technologies Inc., “White Paper - Understanding DSLAM and BRAS
Access Devices,” 2006.
[9] Z. Tsai, "An Introduction to Broadband Network and Data Communications: xDSL 協定架構圖," 台大通訊系統實驗室2011暑期新生訓練, Aug. 04-18, 2011.
[10] ITU. [Online]. Available: http://www.itu.int/.
[11] ITU-R Report M.2023, “Spectrum requirements for International Mobile Telecommunications-2000 (IMT-2000),” May 2000.
[12] ITU-R Report M.2133, “Requirements, evaluation criteria and submission templates for the development of IMT-Advanced,” Nov. 2008.
[13] 3GPP. [Online]. Available: http://www.3gpp.org/.
[14] QUALCOMM Inc., "HSPA+ for Enhanced Mobile Broadband Whitepaper," Feb.
2009.
[15] J. Lopes, L. M. Correia, and, L. Santo, "Performance analysis of UMTS/HSPA at the cellular level," in Proc. of IEEE VTC 2009Spring, Barcelona, Spain, Apr. 2009.
[16] WiMAX Forum. [Online]. Available: http://www.wimaxforum.org/.
[17] WiMAX Forum, “About the WiMAX Forum.” [Online]. Available:
http://www.wimaxforum.org/about.
[18] WiMAX Forum, “WiMAX and the IEEE 802.16m Air Interface Standard,” Apr.
2010
[Online]. Available: http://ccnet.ntu.edu.tw/ADSL/.
[20] Cisco Systems Inc., "Cisco Visual Networking Index (VNI) Forecast and Methodology 2010–2015," Cisco White Paper, Jun. 2011.
[21] Sandvine Inc., "Global Internet Phenomena Report," May 2011.
[22] Arbor Networks Inc., "Trends in Internet Traffic Patterns," 2010.
[23] “IEEE 802.16m Evaluation Methodology Document (EMD), p.116,” IEEE 802.16m-08/004r5, Jan. 2009.
[24] cdma2000 Evaluation Methodology, 3GPP2 C.R1002-B, 3GPP2 Std., Rev. B, Dec.
2009.
[25] A. Abhari and M. Soraya, "Workload Generation for YouTube," Multimedia Tools and Applications Journal, Jun. 2009.
[26] P. Gill, M. Arlitt, Z. Li, and A. Mahanti, "YouTube Traffic Characterization: A View From the Edge," in Proc. of ACM IMC, 2007.
[27] X. Cheng, C. Dale, and J. Liu, “Statistics and Social Network of YouTube Videos,”
in Proc. of IEEE IWQoS, 2008.
[28] C. Liu, L. Shi, B. Liu, “Utility-Based Bandwidth Allocation for Triple-Play Services,” in Proc. of Forth European Conference ECUMN ‘07 on Universal Multiservice Networks, pp. 327-336, Feb. 2007.
[29] C. Curescu and S. Nadjm-Tehrani, “Time-aware utility-based resource allocation in
wireless networks,” IEEE Trans. Parallel Distrib., vol. 16, pp. 624-636, 2005.
[30] S. Bauer, G. Lee, I. Chakraborty, X. Brucker, X. Yang, B. Leong, J. Wroclawski,
"The personal router," in Proc. of the MOBICOM'02, Atlanta, GA, USA, Sep. 23–
28, 2002.
[31] D. Pogue, "Wi-Fi to Go, No Cafe Needed", New York Times, May 6, 2009.
[32] J. Chabarek, J. Sommers, P. Barford, C. Estan, D. Tsiang, and S. Wright, "Power awareness in network design and routing," in Proc. of IEEE INFOCOM, 2008.
[33] J. Baliga, R. Ayre, K. Hinton, and R.S. Tucker, “Energy consumption in wired and wireless access networks,” IEEE Comm. Magazine, vol. 49, no. 6, pp. 70-77, Jun.
2011.
[34] S. Segan, "Novatel Wireless MiFi 3G/4G Mobile Hotspot 4082," PC Magazine, Apr. 2011. [Online]. Available:
http://www.pcmag.com/article2/0,2817,2382886,00.asp.
[35] AMD Inc., "Magic Packet Technology," AMD White Paper, Nov. 1995.
[36] A.B. Downey, “Using Pathchar to Estimate Internet Link Characteristics,” in Proc.
ACM SIGCOMM, pp.222-223, 1999.
[37] M.A. Ergin, M. Gruteser, "Using packet probes for available bandwidth estimation:
a wireless testbed experience," in Proc. of WiNTECH, Los Angeles, USA, 2006, pp.