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題名 異質性無線網路下垂直換手機制之研究
A vertical handoff mechanism in heterogeneous wireless network作者 莊森駒
Chuang, Sen Chu貢獻者 張宏慶
Jang, Hung Chin
莊森駒
Chuang, Sen Chu關鍵詞 遞換
異質網路
乒乓效應
模糊理論
Handover
Heterogeneous Network
Ping Pong effect
Fuzzy Theory日期 2009 上傳時間 9-May-2016 16:46:42 (UTC+8) 摘要 隨著各種無線網路技術興起至今,各類無線網路技術及產品日益成熟與普及且無線網路的使用者也逐漸變多。而今在各種無線網路的廣泛使用下、時而可見的是當一個行動使用者手持行動裝置身處在一地理環境中,手持行動裝置一經掃描後,常會發現有許多無線網路其覆蓋範圍共同覆蓋在同一個地理區域中,此時多個無線存取點(Access Point)就會發生訊號覆蓋的重疊現象。行動使用者的行動裝置常需判斷是否應該切換到另一個無線網路,此種情形也就是所謂的遞換(Handoff)情形。遞換之產生,代表行動使用者從原本的無線網路區域範圍移動到另一個無線網路範圍,此時若因外界無線電訊號有所變化或是相關網路協定運作出現狀況時、就很容易產生通訊中斷的情形。 在本論文中我們將探討在異質性網路的情況下,根據多種不同的參數、來 設計一個垂直交握(Vertical handoff)的機制。以克服在異質性網路中,時常發生連線中斷之問題。本篇論文主要引使用模糊理論概念來推論其遞換(Handoff)執行的時間點,並且明確的告知終端設備要進入何種網路。
In this paper, we propose a terminal –control scheme to avoid unnecessary vertical handovers between 3G cellular and WLAN hotspots. The proposed algorithm is a fuzzy logic based algorithm that can adapt itself to the dynamic conditions of the hybrid networks. The scheme can reduce the access delay, unnecessary handoff probability and aid the handoff decision for better connectivity. This handoff algorithm has much better performance than conventional algorithms and can be extended to other heterogeneous networks.
CHAPTER 1 序論 1 1.1 前言 1 1.2 UMTS網路架構簡介 2 1.3 IEEE 802.11及IEEE 802.11e QoS簡介 6 1.3.1 IEEE 802.11簡介 6 1.3.1.1 RTS/CTS 6 1.3.1.2 分散式協調功能(DCF) 7 1.3.1.3 集中式協調功能 (PCF) 8 1.3.2 IEEE 802.11e QoS簡介 9 1.4 IEEE 802.21 簡介 12 1.4.1 媒體獨立事件服務 13 1.4.2 媒體獨立命令服務 14 1.4.3 媒體獨立資訊服務 16 1.5 研究動機 16 1.6 論文章節架構 17 CHAPTER 2 背景及相關研究 18 2.1 階層式異質性網路架構 18 2.2 Handoff介紹 19 2.3 Ping Pong Effect (乒乓效應)及遲滯現象 21 2.4 相關研究 22 CHAPTER 3 模糊理論及演算法 25 3.1 真實世界的特性—模糊化的現象[15,50] 25 3.2 Fuzzy理論概述 26 3.3 模糊輸入歸屬函數 28 3.4 模糊規則庫 28 3.5 模糊輸出歸屬函數 29 3.6 系統架構 30 3.7 演算法 34 CHAPTER 4 模擬結果與討論 39 4.1 模擬網路環境與佈建方式之規劃 39 4.2 模擬環境參數設定 40 4.3 模擬實驗之結果分析 41 CHAPTER 5 結論及未來研究方向 44 5.1 結論 44 5.2 未來研究方向 45 REFERENCE 46參考文獻 【1】 3GPP, 3rd Generation Partnership Project;Technical Specification Group Services and Systems Aspects;Network architecture(Release 1999) , TS 23.002 V3.6.0 (2002-09) 【2】 3GPP, 3rd Generation Partnership Project;Technical Specification Group Services and Systems Aspects;Network architecture(Release 4) , TS 23.002 V4.8.0 (2003-06) 【3】 3GPP, 3rd Generation Partnership Project;Technical Specification Group Services and Systems Aspects;Network architecture(Release 5) , TS 23.002 V5.12.0 (2003-09) 【4】 3GPP, 3rd Generation Partnership Project;Technical Specification Group Services and Systems Aspects;Network architecture(Release 5) , TS 23.107 V5.10.0 (2003-09) 【5】 IEEE, ”Wireless LAN Medium Access Medium Access Control(MAC) and Physical Layer (PHY) specifications.” IEEE Standard 802.11, June, 1999 【6】 IEEE “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications Amendment 8: Medium Access Control (MAC) Quality of Service Enhancements” IEEE Standard 802.11e, November, 2005 【7】 IEEE P802.21™/D05.00, April 2007 【8】 M Stemm, RH Katz (1998), Vertical handoffs in wireless overlay networks - Mobile Networks and applications 4:335-350 【9】 J. McNair, F. Zhu (2004), Vertical handoffs in fourth-generation multinetwork environments, IEEE Wireless Communications 11: 8–15 【10】 Nkansah-Gyekye Yaw, I. Agbinya Johnson ( 2006), Vertical handoff between WWAN and WLAN, in: International Conference on Systems and International Conference on Mobile Communications and Learning Technologies, , pp. 132–132. 【11】 S. Lahde, M. Doering, L. Wolf (2007), Dynamic transport layer handover for heterogeneous communication environments, Computer Communications 30 3232–3238. 【12】 P. Chan, R. Sheriff, Y. Hu, P. Conforto, C. Tocci(2001), Mobility management incorporating fuzzy logic for a heterogeneous IP environment, IEEE Communications Magazine 39 42–51. 【13】 E. Stevens-Navarro, V. Wong (2006), Comparison between vertical handoff decision algorithms for heterogeneous wireless networks, in: Proceedings of IEE Vehicular Technology conference (VTC-Spring), vol. 2, pp. 947–951. 【14】 M. Bernaschi, F. Cacace, A. Pescape, S. Za (2005), analysis and experimentation over heterogeneous wireless networks, in: First International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities, 2005 (Tridentcom 2005), pp. 182–191. 【15】 許志義 “多目標屬性決策"五南圖書 民國92 年增定版 【16】 W. Zhang, J. Jaehnert, K. Dolzer (2003), Design and evaluation of a handover decision strategy for 4th generation mobile networks, in The 57th IEEE Semiannual Vehicular Technology Conference, 2003 (VTC 2003-Spring), vol. 3,, pp. 1969–1973. 【17】 H. Wang, R. Katz, J (1999). Giese, Policy-enabled handoffs across heterogeneous wireless networks, Second IEEE Workshop on Mobile Computing Systems and Applications, (Proceedings WMCSA’99), 1999, pp. 51–60. 【18】 Wenhui Zhang, (2004 ) “Handover Decision Using Fuzzy MADM in Heterogeneous Networks" WCNC 【19】 K.Pahlavan, P. Krishnamurthy, A. Hatami, M. Ylianttila, J.P.Makela, R.Pichna and J.Vallstron (2000), “Handoff in hybrid mobile data networks" IEEE Comm. Mag. 7(4) Apr. 【20】 W. Chen, J. Liu, H. Huang(2004), An adaptive scheme for vertical handoff in wireless overlay networks, in: Proceedings on the 10th International Conference on Parallel and Distributed Systems, 2004 (ICPADS 2004), pp. 541–548. 【21】 F. Zhu, J. McNair ( 2004), Optimizations for vertical handoff decision algorithms, in: IEEE Wireless Communications and Networking Conference, , vol. 2, 2004, pp. 867–872. 【22】 A. Calvagna, G. Di Modica (2004), A user-centric analysis of vertical handovers, in: Proceedings of the Second ACM International Workshop on Wireless Mobile Applications and Services on WLAN Hotspots, pp. 137–146. 【23】 S. Quiqyang, A. Jamalipour 2005, A network selection mechanism for nextgeneration networks, in: International Conference of Communications, , vol. 2, 2005, pp. 1418–1422. 【24】 P. Chan, Y. Hu, R. Sheriff (2002), Implementation of fuzzy multiple objective decision making algorithm in a heterogeneous mobile environment, in: IEEE Wireless Communications and Networking Conference, 2002 (WCNC 2002), vol. 1, , pp. 332–336. 【25】 Q. Guo, J. Zhu, X. Xu (2005), An adaptive multi-criteria vertical handoff decision algorithm for radio heterogeneous network, in: IEEE International Conference on Communications, 2005 (ICC 2005)vol. 4, , pp. 2769–2773. 【26】 Q. Wei, K. Farkas, C. Prehofer, P. Mendes, B. Plattner (2006), Context-aware handover using active network technology, Computer Networks50 P 2855–2872. 【27】 S. Balasubramaniam, J. Indulska (2004), Vertical handover supporting pervasive computing in future wireless networks, Computer Communications 27 708–719. 【28】 M. Kassar, B. Kervella, G. Pujolle (2007), Architecture of an intelligent intersystem handover management scheme, Future Generation Communication and Networking p 332–337. 【29】 A. Kaloxylos, G. Lampropoulos, N. Passas, L. Merakos (2006), A flexible handover mechanism for seamless service continuity in heterogeneous environments,Computer Communications 29 717–729. 【30】 Shu-Jen Chen, Ching-Lai Hwang, Frank P.Hwang (1992), “Fuzzy Multiple Attribute Decision Making,“ Springer-Verlag. 【31】 D. Nikitopoulos, N. Papaoulakis, A. Trakos, A. Giamas, E. Sykas, M (2005). Theologou,Authentication platform for seamless handover in heterogeneous environments, in: Joint International Conference on Autonomic and Autonomous Systems and International Conference on Networking and Services, , pp. 36–36. 【32】 M. Kim, S.J. Cho, S.Y. Kim (2007), A study of seamless handover service and QoS in heterogeneous wireless networks, in: The 9th International Conference Advanced Communication Technology, vol. 3, , pp. 1922–1925. 【33】 J.Y. Hwang, J. Oh, Y. Han( 2007), A two-step vertical handoff algorithm in heterogeneous traffic and systems, in: 66th IEEE Vehicular Technology Conference, pp. 1543–1547. 【34】 S.N. Enrique, V.W.S. Wong, Y. Lin (2007), A vertical handoff decision algorithm for heterogeneous wireless networks, in: IEEE Wireless Communications and Networking Conference, pp. 3199–3204. 【35】 C.J. Lin, I.T. Tsai, C.Y. Lee (2004),, An adaptive fuzzy predictor based handoff algorithm for heterogeneous network, in: IEEE Annual Meeting of the Fuzzy Information, Processing NAFIPS, vol. 2, pp. 944–947. 【36】 A. Mehbodniya, J. Chitizadeh ( 2005), An intelligent vertical handoff algorithm for next generation wireless networks, in: Second IFIP International Conference on Wireless and Optical Communications Networks, , pp. 244–249. 【37】 A.H. Zahran, B. Liang (2005), Performance evaluation framework for vertical handoff algorithms in heterogeneous networks, communications, in: IEEE International Conference, vol. 1, , pp. 173–178. 【38】 S. Chebbine, M.T. Chebbine, A. Obaid, R. Johnston (2005) Framework architecture for internet content adaptation system and vertical handover management on 4G networks, in: Wireless Telecommunications Symposium, pp. 34–44. 【39】 D. Bultman, M. Siebert, M. Lott( 2005) Performance evaluation of accuratetrigger generation for vertical handover, in: 16th IEEE International ymposium on Indoor and Mobile Radio Communications, vol. 3, pp. 2034–2039. 描述 碩士
國立政治大學
資訊科學學系
93971005資料來源 http://thesis.lib.nccu.edu.tw/record/#G0093971005 資料類型 thesis dc.contributor.advisor 張宏慶 zh_TW dc.contributor.advisor Jang, Hung Chin en_US dc.contributor.author (Authors) 莊森駒 zh_TW dc.contributor.author (Authors) Chuang, Sen Chu en_US dc.creator (作者) 莊森駒 zh_TW dc.creator (作者) Chuang, Sen Chu en_US dc.date (日期) 2009 en_US dc.date.accessioned 9-May-2016 16:46:42 (UTC+8) - dc.date.available 9-May-2016 16:46:42 (UTC+8) - dc.date.issued (上傳時間) 9-May-2016 16:46:42 (UTC+8) - dc.identifier (Other Identifiers) G0093971005 en_US dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/95638 - dc.description (描述) 碩士 zh_TW dc.description (描述) 國立政治大學 zh_TW dc.description (描述) 資訊科學學系 zh_TW dc.description (描述) 93971005 zh_TW dc.description.abstract (摘要) 隨著各種無線網路技術興起至今,各類無線網路技術及產品日益成熟與普及且無線網路的使用者也逐漸變多。而今在各種無線網路的廣泛使用下、時而可見的是當一個行動使用者手持行動裝置身處在一地理環境中,手持行動裝置一經掃描後,常會發現有許多無線網路其覆蓋範圍共同覆蓋在同一個地理區域中,此時多個無線存取點(Access Point)就會發生訊號覆蓋的重疊現象。行動使用者的行動裝置常需判斷是否應該切換到另一個無線網路,此種情形也就是所謂的遞換(Handoff)情形。遞換之產生,代表行動使用者從原本的無線網路區域範圍移動到另一個無線網路範圍,此時若因外界無線電訊號有所變化或是相關網路協定運作出現狀況時、就很容易產生通訊中斷的情形。 在本論文中我們將探討在異質性網路的情況下,根據多種不同的參數、來 設計一個垂直交握(Vertical handoff)的機制。以克服在異質性網路中,時常發生連線中斷之問題。本篇論文主要引使用模糊理論概念來推論其遞換(Handoff)執行的時間點,並且明確的告知終端設備要進入何種網路。 zh_TW dc.description.abstract (摘要) In this paper, we propose a terminal –control scheme to avoid unnecessary vertical handovers between 3G cellular and WLAN hotspots. The proposed algorithm is a fuzzy logic based algorithm that can adapt itself to the dynamic conditions of the hybrid networks. The scheme can reduce the access delay, unnecessary handoff probability and aid the handoff decision for better connectivity. This handoff algorithm has much better performance than conventional algorithms and can be extended to other heterogeneous networks. en_US dc.description.abstract (摘要) CHAPTER 1 序論 1 1.1 前言 1 1.2 UMTS網路架構簡介 2 1.3 IEEE 802.11及IEEE 802.11e QoS簡介 6 1.3.1 IEEE 802.11簡介 6 1.3.1.1 RTS/CTS 6 1.3.1.2 分散式協調功能(DCF) 7 1.3.1.3 集中式協調功能 (PCF) 8 1.3.2 IEEE 802.11e QoS簡介 9 1.4 IEEE 802.21 簡介 12 1.4.1 媒體獨立事件服務 13 1.4.2 媒體獨立命令服務 14 1.4.3 媒體獨立資訊服務 16 1.5 研究動機 16 1.6 論文章節架構 17 CHAPTER 2 背景及相關研究 18 2.1 階層式異質性網路架構 18 2.2 Handoff介紹 19 2.3 Ping Pong Effect (乒乓效應)及遲滯現象 21 2.4 相關研究 22 CHAPTER 3 模糊理論及演算法 25 3.1 真實世界的特性—模糊化的現象[15,50] 25 3.2 Fuzzy理論概述 26 3.3 模糊輸入歸屬函數 28 3.4 模糊規則庫 28 3.5 模糊輸出歸屬函數 29 3.6 系統架構 30 3.7 演算法 34 CHAPTER 4 模擬結果與討論 39 4.1 模擬網路環境與佈建方式之規劃 39 4.2 模擬環境參數設定 40 4.3 模擬實驗之結果分析 41 CHAPTER 5 結論及未來研究方向 44 5.1 結論 44 5.2 未來研究方向 45 REFERENCE 46 - dc.description.tableofcontents CHAPTER 1 序論 1 1.1 前言 1 1.2 UMTS網路架構簡介 2 1.3 IEEE 802.11及IEEE 802.11e QoS簡介 6 1.3.1 IEEE 802.11簡介 6 1.3.1.1 RTS/CTS 6 1.3.1.2 分散式協調功能(DCF) 7 1.3.1.3 集中式協調功能 (PCF) 8 1.3.2 IEEE 802.11e QoS簡介 9 1.4 IEEE 802.21 簡介 12 1.4.1 媒體獨立事件服務 13 1.4.2 媒體獨立命令服務 14 1.4.3 媒體獨立資訊服務 16 1.5 研究動機 16 1.6 論文章節架構 17 CHAPTER 2 背景及相關研究 18 2.1 階層式異質性網路架構 18 2.2 Handoff介紹 19 2.3 Ping Pong Effect (乒乓效應)及遲滯現象 21 2.4 相關研究 22 CHAPTER 3 模糊理論及演算法 25 3.1 真實世界的特性—模糊化的現象[15,50] 25 3.2 Fuzzy理論概述 26 3.3 模糊輸入歸屬函數 28 3.4 模糊規則庫 28 3.5 模糊輸出歸屬函數 29 3.6 系統架構 30 3.7 演算法 34 CHAPTER 4 模擬結果與討論 39 4.1 模擬網路環境與佈建方式之規劃 39 4.2 模擬環境參數設定 40 4.3 模擬實驗之結果分析 41 CHAPTER 5 結論及未來研究方向 44 5.1 結論 44 5.2 未來研究方向 45 REFERENCE 46 zh_TW dc.source.uri (資料來源) http://thesis.lib.nccu.edu.tw/record/#G0093971005 en_US dc.subject (關鍵詞) 遞換 zh_TW dc.subject (關鍵詞) 異質網路 zh_TW dc.subject (關鍵詞) 乒乓效應 zh_TW dc.subject (關鍵詞) 模糊理論 zh_TW dc.subject (關鍵詞) Handover en_US dc.subject (關鍵詞) Heterogeneous Network en_US dc.subject (關鍵詞) Ping Pong effect en_US dc.subject (關鍵詞) Fuzzy Theory en_US dc.title (題名) 異質性無線網路下垂直換手機制之研究 zh_TW dc.title (題名) A vertical handoff mechanism in heterogeneous wireless network en_US dc.type (資料類型) thesis en_US dc.relation.reference (參考文獻) 【1】 3GPP, 3rd Generation Partnership Project;Technical Specification Group Services and Systems Aspects;Network architecture(Release 1999) , TS 23.002 V3.6.0 (2002-09) 【2】 3GPP, 3rd Generation Partnership Project;Technical Specification Group Services and Systems Aspects;Network architecture(Release 4) , TS 23.002 V4.8.0 (2003-06) 【3】 3GPP, 3rd Generation Partnership Project;Technical Specification Group Services and Systems Aspects;Network architecture(Release 5) , TS 23.002 V5.12.0 (2003-09) 【4】 3GPP, 3rd Generation Partnership Project;Technical Specification Group Services and Systems Aspects;Network architecture(Release 5) , TS 23.107 V5.10.0 (2003-09) 【5】 IEEE, ”Wireless LAN Medium Access Medium Access Control(MAC) and Physical Layer (PHY) specifications.” IEEE Standard 802.11, June, 1999 【6】 IEEE “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications Amendment 8: Medium Access Control (MAC) Quality of Service Enhancements” IEEE Standard 802.11e, November, 2005 【7】 IEEE P802.21™/D05.00, April 2007 【8】 M Stemm, RH Katz (1998), Vertical handoffs in wireless overlay networks - Mobile Networks and applications 4:335-350 【9】 J. McNair, F. Zhu (2004), Vertical handoffs in fourth-generation multinetwork environments, IEEE Wireless Communications 11: 8–15 【10】 Nkansah-Gyekye Yaw, I. Agbinya Johnson ( 2006), Vertical handoff between WWAN and WLAN, in: International Conference on Systems and International Conference on Mobile Communications and Learning Technologies, , pp. 132–132. 【11】 S. Lahde, M. Doering, L. Wolf (2007), Dynamic transport layer handover for heterogeneous communication environments, Computer Communications 30 3232–3238. 【12】 P. Chan, R. Sheriff, Y. Hu, P. Conforto, C. Tocci(2001), Mobility management incorporating fuzzy logic for a heterogeneous IP environment, IEEE Communications Magazine 39 42–51. 【13】 E. Stevens-Navarro, V. Wong (2006), Comparison between vertical handoff decision algorithms for heterogeneous wireless networks, in: Proceedings of IEE Vehicular Technology conference (VTC-Spring), vol. 2, pp. 947–951. 【14】 M. Bernaschi, F. Cacace, A. Pescape, S. Za (2005), analysis and experimentation over heterogeneous wireless networks, in: First International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities, 2005 (Tridentcom 2005), pp. 182–191. 【15】 許志義 “多目標屬性決策"五南圖書 民國92 年增定版 【16】 W. Zhang, J. Jaehnert, K. Dolzer (2003), Design and evaluation of a handover decision strategy for 4th generation mobile networks, in The 57th IEEE Semiannual Vehicular Technology Conference, 2003 (VTC 2003-Spring), vol. 3,, pp. 1969–1973. 【17】 H. Wang, R. Katz, J (1999). Giese, Policy-enabled handoffs across heterogeneous wireless networks, Second IEEE Workshop on Mobile Computing Systems and Applications, (Proceedings WMCSA’99), 1999, pp. 51–60. 【18】 Wenhui Zhang, (2004 ) “Handover Decision Using Fuzzy MADM in Heterogeneous Networks" WCNC 【19】 K.Pahlavan, P. Krishnamurthy, A. Hatami, M. Ylianttila, J.P.Makela, R.Pichna and J.Vallstron (2000), “Handoff in hybrid mobile data networks" IEEE Comm. Mag. 7(4) Apr. 【20】 W. Chen, J. Liu, H. Huang(2004), An adaptive scheme for vertical handoff in wireless overlay networks, in: Proceedings on the 10th International Conference on Parallel and Distributed Systems, 2004 (ICPADS 2004), pp. 541–548. 【21】 F. Zhu, J. McNair ( 2004), Optimizations for vertical handoff decision algorithms, in: IEEE Wireless Communications and Networking Conference, , vol. 2, 2004, pp. 867–872. 【22】 A. Calvagna, G. Di Modica (2004), A user-centric analysis of vertical handovers, in: Proceedings of the Second ACM International Workshop on Wireless Mobile Applications and Services on WLAN Hotspots, pp. 137–146. 【23】 S. Quiqyang, A. Jamalipour 2005, A network selection mechanism for nextgeneration networks, in: International Conference of Communications, , vol. 2, 2005, pp. 1418–1422. 【24】 P. Chan, Y. Hu, R. Sheriff (2002), Implementation of fuzzy multiple objective decision making algorithm in a heterogeneous mobile environment, in: IEEE Wireless Communications and Networking Conference, 2002 (WCNC 2002), vol. 1, , pp. 332–336. 【25】 Q. Guo, J. Zhu, X. Xu (2005), An adaptive multi-criteria vertical handoff decision algorithm for radio heterogeneous network, in: IEEE International Conference on Communications, 2005 (ICC 2005)vol. 4, , pp. 2769–2773. 【26】 Q. Wei, K. Farkas, C. Prehofer, P. Mendes, B. Plattner (2006), Context-aware handover using active network technology, Computer Networks50 P 2855–2872. 【27】 S. Balasubramaniam, J. Indulska (2004), Vertical handover supporting pervasive computing in future wireless networks, Computer Communications 27 708–719. 【28】 M. Kassar, B. Kervella, G. Pujolle (2007), Architecture of an intelligent intersystem handover management scheme, Future Generation Communication and Networking p 332–337. 【29】 A. Kaloxylos, G. Lampropoulos, N. Passas, L. Merakos (2006), A flexible handover mechanism for seamless service continuity in heterogeneous environments,Computer Communications 29 717–729. 【30】 Shu-Jen Chen, Ching-Lai Hwang, Frank P.Hwang (1992), “Fuzzy Multiple Attribute Decision Making,“ Springer-Verlag. 【31】 D. Nikitopoulos, N. Papaoulakis, A. Trakos, A. Giamas, E. Sykas, M (2005). Theologou,Authentication platform for seamless handover in heterogeneous environments, in: Joint International Conference on Autonomic and Autonomous Systems and International Conference on Networking and Services, , pp. 36–36. 【32】 M. Kim, S.J. Cho, S.Y. Kim (2007), A study of seamless handover service and QoS in heterogeneous wireless networks, in: The 9th International Conference Advanced Communication Technology, vol. 3, , pp. 1922–1925. 【33】 J.Y. Hwang, J. Oh, Y. Han( 2007), A two-step vertical handoff algorithm in heterogeneous traffic and systems, in: 66th IEEE Vehicular Technology Conference, pp. 1543–1547. 【34】 S.N. Enrique, V.W.S. 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