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| Title: | 5G非獨立網路下的換手機制研究
A study on handover mechanism in 5G Non-standalone network |
| Authors: | 張凱勝
Chang, Kai-Sheng |
| Contributors: | 張宏慶
Hung-Chin Jang
張凱勝
Chang, Kai-Sheng |
| Keywords: | 5G
LTE
換手
異質網路
Non-standalone(NSA)
5G
LTE
handover
heterogeneous network
Non-standalone (NSA) |
| Date: | 2019 |
| Issue Date: | 2020-08-03 17:58:49 (UTC+8) |
| Abstract: | 近年各個產業數位化，迎面而來的是龐大的網路需求，僅靠現有LTE系統是無法提供如此高的網路流量，因此，未來網路環境勢必整合其他異質網路，來提供更高的行動頻寬。有著成本低、佈署快速特性的小型基地台在此扮演極為重要的角色，佈署的數量是以倍數成長。這意味著未來異質網路的基地台密度會提高，換手的次數會隨著基地台的部署變得更加頻繁，產生嚴重的乒乓效應而降低系統效能，僅靠以往依據接收信號強度(Received Signal Strength)作為判斷換手的條件，已不能保持連線服務的品質。因此本研究基於異質網路的架構提出一套新的換手演算法，包含Measuring module、Scoring module、Forwarding module和Ping-pong module四個模組。目的是在高密度的基地台環境下減少乒乓效應的發生，考慮基地台頻寬、訊號強度、UE的移動方向以及基地台的位置，分別對每個候選基地台評分以及篩選，以確保在符合使用者QoS需求的前提下進行換手，提高使用者UE的throughput。
自從2019年6月第三代合作夥伴計劃(3GPP)發布Release15後，正式開啟5G的行動世代。5G是目前各界關注的一項新網路系統，其技術對於各個產業無非都是一大推手。然而5G的建置成本很高，短期內無法全部換成5G設備，因此預期5G是漸進式的布建，與4G會有一段並存期。3GPP將5G發展分成早期版本的非獨立組網(Non-standalone)與後期版本的獨立組網(Standalone)，共提出7種5G的候選網路架構，其中以非獨立組網的選項3是各界公認最早期的5G發展版本，因此本論文基於此架構做模擬。經由模擬實驗結果顯示，本研究提出的HO5G-C演算法相較於LTE標準換手演算法，在高密度的基地台環境下可改善33.9%的換手次數，增加9.3%的傳輸吞吐量。
In recent years, the digitization of various industries has brought about substantial network demands. The existing LTE system cannot provide such high network traffic. Therefore, the future network environment must integrate other heterogeneous networks to provide higher mobile bandwidth.
Small cells with low cost and rapid deployment characteristics play a significant role in the future. The number of deployments will grow in multiples. This means that the density of base stations in the future network will increase and the number of handovers will become more frequent. It will bring serious ping-pong effects and reduce system performance. The traditional handover conditions based on received signal strength can no longer meet the quality requirement of connected services. This study proposes a new handover algorithm based on the architecture of heterogeneous networks, including four modules: measuring module, scoring module, forwarding module, and ping-pong module. The purpose is to reduce ping-pong effects in a high-density of base stations environment. We consider the bandwidth of the base stations, the signal strength, the direction of the UE`s movement, and the location of the base stations. Each candidate base station is scored by the modules, and we choose the one with the highest score to ensure that it meets the user`s QoS requirements.
Since the release of Release15 proposed by the 3GPP in June 2019, 5G has officially launched the new mobile generation. 5G is a new network system that everyone is looking forward to, and its technology is a big push for all industries. However, the construction cost of 5G is huge, and it is impossible to replace all 5G equipment in short term. Therefore, 5G is expected to be deployed gradually, and there will be a period of coexistence with 4G. 3GPP planned to divide 5G development into early version of Non-standalone and later versions of Standalone. There are seven kinds of 5G candidate network architectures, among these option 3 of Non-standalone is considered the earliest version of 5G development. The simulation of this study is based on this architecture. Finally, simulation experiments showed that the HO5G-C algorithm proposed in this study reduces the number of handover by 33.9% and enhances the system throughput by 9.3% in a high-density base station environment compared to the LTE standard handover algorithm. |
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| Description: | 碩士
國立政治大學
資訊科學系
105753016 |
| Source URI: | http://thesis.lib.nccu.edu.tw/record/#G0105753016 |
| Data Type: | thesis |
| DOI: | 10.6814/NCCU202001122 |
| Appears in Collections: | [資訊科學系] 學位論文
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