臺灣博碩士論文加值系統

隨著新興的行動網路世代的來臨，行動網路的使用人數逐年上升，網路速度提升與服務品質都是重要的研究課題。在人潮眾多區域，即使營運商廣泛布建基地台，使用者還是會面臨網路壅塞造成行動網路使用效果不佳的情形。原因是，使用者只能就近隨機選擇附近的基地台裝置，對於哪個基地台網路負載較輕根本無從得知。
在基地台網路負載過高情況發生，如果能立即幫助使用者選擇其他的非3GPP的網路系統，例如 Wi-Fi 無線網路，來卸載網路流量，除了減輕基地台的負擔，也能更有效的利用網路設備的資源。
基於上述的情形，本論文希望透過軟體定義網路（Software-defined networking, SDN）的概念提出一個系統架構來管理異質網路，幫助使用者選擇一個最適合的行動網路，達到透過異質網路做到網路卸載功能。

Because of the emerging of next-generation mobile networks, mobile phone users are increasing every year. Hence, mobile network bandwidth and quality of experience are important research issues. At a crowed place, users usually face network congestion. One of the reasons is that mobile phones cannot know the base station's load and always select the nearest base station. Therefore, we should dynamically offload users to other non-3GPP networks, such as Wi-Fi system, when the serving base station is congested. It will not only reduce the cellular network's load, but also improve total network utilization. In this thesis, we propose a SDN-based solution that can manage heterogeneous networks and help user equipment to select a network of better quality. Detailed experiments are also presented. The results show that our proposed technique is feasible and can offload user traffic effectively.

摘要 I
ABSTRACT II
誌謝 III
表目錄 VI
圖目錄 VII
1 簡介 - 1 -
1.1 前言 - 1 -
1.2 研究動機 - 1 -
2 架構說明 - 3 -
2.1 SDN網路架構 - 3 -
2.2 WI-FI OFFLOADING 情境架構 - 4 -
2.3 WI-FI DIRECT OFFLOADING 情境架構 - 4 -
2.4 WI-FI DIRECT RELAY 情境架構 - 5 -
3 ANDSF - 7 -
3.1 ANDSF 簡介 - 7 -
3.2 ANDSF 功能 - 7 -
3.3 OMA DM 協定 - 9 -
3.4 各情境的 ANDSF 流程 - 10 -
3.4.1 Wi-Fi offloading - 11 -
3.4.2 Wi-Fi Direct offloading - 12 -
3.4.3 Wi-Fi Direct relay - 14 -
3.5 PROTOCOL STACK - 15 -
4 實驗 - 17 -
4.1 WI-FI OFFLOADING - 17 -
4.1.1 實驗環境 - 17 -
4.1.2 實驗結果 - 18 -
4.2 WI-FI DIRECT OFFLOADING - 20 -
4.2.1 實驗環境 - 20 -
4.2.2 實驗結果 - 21 -
4.3 WI-FI DIRECT RELAY - 23 -
4.3.1 實驗環境 - 23 -
4.3.2 實驗結果 - 25 -
5 相關研究 - 27 -
6 結論 - 28 -
參考文獻 - 29 -

[1] 3GPP TR 23.852: “Study on S2a Mobility based on GPRS Tunnelling Protocol (GTP) and Wireless Local Area Network (WLAN) access to the Enhanced Packet Core (EPC) network (SaMOG)”.

[2] 3GPP TS 24.302: “Access to the 3GPP Evolved Packet Core（EPC）via non-3GPP access networks”.

[3] OMA-TS-DM_Protocol-V1_2: “OMA Device Management Protocol”.

[4] 3GPP TS 24.312: “Access Network Discovery and Selection Function（ANDSF）Management Object（MO）”.

[5] Chang-Li Liao, “Design and Implementation of an SDN-based Offloading Mechanism across Heterogeneous Networks.”

[6] Chun-Yu Yeh, “D2D Offloading: New Methods and Implementation Based on SDN and Wi-Fi Direct.”
[7] WiFi Manager. https://play.google.com/store/apps/details?id=org.kman.WifiManager.

[8] Open WiFi Finder. https://play.google.com/store/apps/details?id=open.free.wifi.finder.com.

[9] WiFi Scanner. https://play.google.com/store/apps/details?id=gr.androiddev.WifiScanner.

[10] Dae Sun Kim, Yujin Noishiki, Yoshinori Kitatsuji and Hidetoshi Yokota, “Efficient ANDSF-assisted Wi-Fi control for mobile data offloading,” Wireless Communications and Mobile Computing Conference (IWCMC), pp. 343-348, 2013.

[11] Young Min Kwon, Jun Suk Kim, Jaheon Gu, and Min Young Chung, “
ANDSF-based Congestion Control Procedure in Heterogeneous Networks,” Information Networking (ICOIN), pp. 547-550, 2013.

[12] Savio Dimatteo, Pan Hu, Bo Han and Victor O.K. L, “Cellular Traffic Offloading through WiFi Networks,” in Mobile Adhoc and Sensor Systems (MASS), pp. 192-201, 2011.

[13] ADNAN AIJAZ, HAMID AGHVAMI and MOJDEH AMANI, “A survey on mobile data offloading: technical and business perspectives,” in Wireless Communications, IEEE, pp. 104-112, 2013.

[14] L. Wang and G.-S. Kuo, “Mathematical modeling for network selection in heterogeneous wireless networks - a tutorial,” Commun. Surveys Tuts., vol. 15, no. 1, pp. 271–292, First quarter 2013.

[15] S. Singh, H. Dhillon, and J. Andrews, “Offloading in heterogeneous networks: Modeling, analysis, and design insights,” IEEE Trans. Wireless Commun., vol. 12, no. 5, pp. 2484–2497, May 2013.

[16] Mikhail Gerasimenko, Nageen Himayat, Shu-ping Yeh, Shilpa Talwar, Sergey Andreev, and Yevgeni Koucheryavy, “Characterizing Performance of Load-Aware Network Selection in Multi-Radio (WiFi/LTE) Heterogeneous Networks,” Globecom 2013 Workshop – Broadband Wireless Access.

[17] Desta Haileselassie Hagos and Rudiger Kapitza, “Study on Performance-Centric Offload Strategies For LTE Networks,” IFIP WMNC’2013.

[18] Jinho Kim, Yasufumi Morioka, and Junichiro Hagiwara, “An Optimized Seamless IP Flow Mobility Management Architecture for Traffic Offloading,” Network Operations and Management Symposium (NOMS), 2012 IEEE.

[19] Filippo Rebecchi, Marcelo Dias de Amorim, Vania Conan, Andrea Passarella, Raffaele Bruno, and Marco Conti, “Data Offloading Techniques in Cellular Networks: A Survey,” IEEE COMMUNICATION SURVEYS &; TUTORIALS, VOL. 17, NO. 2, SECOND QUARTER 2015.