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研究生:黃渝新
研究生(外文):Yu-Shin Huang
論文名稱:利用GPS輔助的LTE無線網路換手機制
論文名稱(外文):A handover scheme for LTE wireless networks under the assistance of GPS
指導教授:呂芳懌呂芳懌引用關係
指導教授(外文):Fang-Yie Leu
口試委員:楊伏夷林宜隆林正偉余心淳
口試日期:2015-06-25
學位類別:碩士
校院名稱:東海大學
系所名稱:資訊工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2015
畢業學年度:103
語文別:英文
論文頁數:37
中文關鍵詞:長期演進技術換手全球定位系統目標選擇同質性換手
外文關鍵詞:long term evolutionhandovergpstarget selectionhomogeneous handover
相關次數:
  • 被引用被引用:2
  • 點閱點閱:117
  • 評分評分:
  • 下載下載:3
  • 收藏至我的研究室書目清單書目收藏:0
隨著行動裝置的蓬勃發展,行動裝置對於高速網路的品質要求也明顯地比以前高上許多。許多
研究人員正盡全力地發展各種不同的通訊方法和通訊服務來服務使用者。同時,行動裝置熱門程
度在最近幾年也飛快的成長。另一方面,從 2008 年 LTE 網路被發表以來,直到現在它都還是受
到大家矚目。在 LTE 中,行動裝置 UE 從基地台 A 移動到基地台 B 時,LTE 需要協助它執行換
手程序,俾讓 UE 順利地從基地台 A 換手到基地台 B,使得行動裝置能夠在保持連線的狀態下繼
續移動。如果換手的工作沒有成功地完成,UE 必須重新連接到網路,使用者將會感覺到大量的
通訊延遲。現階段決定是否換手仍然還是以無線電波之強弱為主要的參考依據。不過仍然會存在
許多問題。這是因為無線電波的特性使然,舉凡行動裝置的位置、移動速度、移動方向都很有可
能影響電波的強度。因而在這篇研究當中,我們使用了 GPS 系統來輔助 LTE 之換手機制,並以
UE 當前之狀態,如:移動方向、移動速度、信號強度、距離等因素來決定欲換手的對象,使得
UE 能夠更精準的找到最合適的換手對象,進而提昇 LTE 整體的運作效率。
With the rising popularity of mobile networks, the requirements of accessing wireless services
through mobile devices have been significantly higher than before. Many researches have developed
different communication functions and applications to serve users. The population of mobile users
increases significantly in recent years. Also, since 2008 Long Term Evolution (LTE for short) has
attracted researchers’ attention. When a user equipment (UE for short) moves from an evolved
Node B (eNB for short) to another, the LTE needs to help the UE to hand over from the serving
eNB(SeNB for short)and target eNB(TeNB for short) by managing the provided resources so that the
connection between the UE and the SeNB(TeNB) can be well maintained. If handover is incompletely
performed, the UE may need to re-enter the network. If it is true, then users will experience a longer
communication delay. In face, the connection may also be disconnected. Currently, the radio issue is
still considered as the key factor that affects the time consumed by the handover procedure. However,
it is insufficient if we only measure the strength of the radio that the UE receives from its SeNB
to determine whether UE needs to hand over or not since the UE’s location, moving speed and
moving direction are also important factors that may affect the handover quality. In this study, we
employ the information provided by a GPS and use several status parameters, e.g, UE’s location,
moving speed, moving direction and distance to help the determination of TeNB for LTE systems
during handover so as to more accurately choose the most suitable TeNB and improve handover
performance.
1 Introduction 7
2 Related-works 8
2.1 LTE Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3 LTE Handover Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Our LTE-A Handover Approach 11
3.1 The improved handover implementation . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Definitions of Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3 The ranges of areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.4 The Measurement Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.5 The effect of UE’s moving direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.6 Notification Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.7 Handover Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.8 Selecting the TeNB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4 Performace Analysis 26
4.1 Performace on different numbers of UE . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.2 Performance on different numbers of UEs with different velocities . . . . . . . . . . . 30
4.3 Performace with randomly moving model . . . . . . . . . . . . . . . . . . . . . . . . . 31
5 Conclusions and Future studies 34
[1] 3GPP. General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access. TS 23.401, 3rd Generation Partnership Project (3GPP), 06 2011.
[2] ”ns-3-user” mailing list. Why srs periodicity value of 80 is not enough for 70 ues in lena lte. https://groups.google.com/forum/#!topic/ns-3-users/afDcL8knL_Q.
[3] Aaron Smith. A “week in the life”analysis of smartphone users. http://www.pewinternet.org/2015/04/01/chapter-three-a-week-in-the-life-analysis-of-smartphone-users/, 2015.
[4] Wikipedia. 3g. https://en.wikipedia.org/wiki/3G.
[5] Wikipedia. Wimax. https://en.wikipedia.org/wiki/WiMAX.
[6] Wikipedia. Lte advanced. https://en.wikipedia.org/wiki/LTE_Advanced.
[7] G.P. Pollini. Trends in handover design. Communications Magazine, IEEE, 34(3):82–90, Mar 1996.
[8] M. Anas, F.D. Calabrese, P.-E. Ostling, K.I. Pedersen, and P.E. Mogensen. Performance analysis of handover measurements and layer 3 filtering for utran lte. In Personal, Indoor and Mobile Radio Communications, 2007. PIMRC 2007. IEEE 18th International Symposium on, pages 1–5, Sept 2007.
[9] 3GPP. Evolved Universal Terrestrial Radio Access (E-UTRA) and User Equipment (UE) radio transmission and reception. TS 36.101, 3rd Generation Partnership Project (3GPP), 06 2011.
[10] 3GPP. Evolved Universal Terrestrial Radio Access (E-UTRA); Base Station (BS) radio transmission and reception. Technical report, 3rd Generation Partnership Project (3GPP), 2011.
[11] 3GPP. Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2. TS 36.300, 3rd Generation Partnership Project (3GPP).
[12] 3GPP. Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification. TS 36.331, 3rd Generation Partnership Project (3GPP), 06 2011.
[13] 3GPP. Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 Application Protocol (X2AP). TS 36.423, 3rd Generation Partnership Project (3GPP), 04 2011.
[14] 3GPP. Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP). TS 36.413, 3rd Generation Partnership Project (3GPP), 06 2011.
[15] 3GPP. Radio link management in hierarchical networks. TS 45.022, 3rd Generation Partnership Project (3GPP), 12 2009.
[16] K. Dimou, Min Wang, Yu Yang, M. Kazmi, A. Larmo, J. Pettersson, W. Muller, and Y. Timner. Handover within 3gpp lte: Design principles and performance. In Vehicular Technology Conference Fall (VTC 2009-Fall), 2009 IEEE 70th, pages 1–5, Sept 2009.
[17] NS-3 Project. ns-3. https://www.nsnam.org/.
[18] Wikipedia. Friis transmission equation. https://en.wikipedia.org/wiki/Friis_transmission_equation.
[19] ”ns-3-user” mailing list. Lte (lena) model handover problem. https://groups.google.com/forum/#!topic/ns-3-users/N5xmmBXjKzo.
[20] ShareTechnote. Srs (sounding reference signal). http://www.sharetechnote.com/html/Handbook_LTE_SRS.html.
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