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研究生:林煌瑋
研究生(外文):Huang-Wei Lin
論文名稱:在LTE-A網路中支援機器型態通訊之上行傳輸調控機制
論文名稱(外文):Uplink Access Control for Machine-type Communications in LTE-A Networks
指導教授:黃仁竑黃仁竑引用關係
指導教授(外文):Ren-Hung Hwang
口試委員:賴槿峰黃啟富陳宗禧
口試委員(外文):Chin-Feng LaiChi-Fu HuangTzung-Shi Chen
口試日期:2015-07-20
學位類別:碩士
校院名稱:國立中正大學
系所名稱:資訊工程研究所
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:中文
論文頁數:68
中文關鍵詞:長期演進技術升級版機器型態傳輸隨機接入
外文關鍵詞:LTE-AMachine Type CommunicationRandom Access procedureRACH
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  • 下載下載:9
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近年來,隨著無線網路發展越趨成熟,各種無線網路應用服務也跟著興起,其中以物聯網的應用發展最被看好。在無線網路中,目前以第四代通訊技術中的LTE-A為發展的主軸,並且透過結合物聯網以及LTE-A網路發展出多種應用。在第三代合作夥伴計畫中便提及機器型態傳輸的技術,作為未來發展物聯網設備的標準規格。

在物聯網的發展上,機器型態傳輸在LTE-A網路的發展卻碰上許多的挑戰,首先面臨的便是LTE-A網路最初的設計為提供給人類型態傳輸使用,機器型態傳輸設備與人類型態傳輸設備在資料量的大小、傳輸週期、對於延遲時間的容忍方面有所不同。其次在LTE-A網路中,當設備要開始進入LTE-A網路,必須透過隨機接入流程來與地區的基地台達到上下行的同步,而隨著物聯網設備漸漸普及於人類生活中,伴隨而來的是大量機器的隨機接入要求,因此如何改善隨機接入流程以處理大量機器型態傳輸設備的隨機接入要求並且不影響到人類型態傳輸設備便是本研究所討論重點。

在本研究中提出『適應性隨機接入通道資源調整機制』,透過結合資源調控機制、ACB機制、Priority Device Setting機制來改善隨機接入流程以處理大量的機器型態傳輸設備,由模擬結果顯示在大量機器型態傳輸設備進入LTE-A網路中,透過該機制可以使隨機接入成功率提昇,並且符合設備的延遲時間需求。

Internet of Things (IoT) has been considered as one of the key technologies for the next decade.
One of the key features of IoT is the global connectivity of things, such as smart meters, wireless sensors, etc.
LTE-A has been considered as the main means for connecting wireless devices to the Internet. For this reason, Machine Type Communication (MTC) has been defined in the 3GPP LTE-A specification.

As the development of IOT , MTC will face many challenge.
Firstly, the initial design for LTE-A network is to support Human Type Communication (HTC).
However, traffic characteristics of MTC and HTC could be very different, such as data size, transmission cycle and delay tolerance.
How to accommodate large amount of MTC without affecting the grade of service of HTC is a big challenge.
Secondly, when a device wants to access the LTE-A network, it has to start Random Access(RA) procedure for communicating with the eNB.
After the procedure, the device can then synchronize in uplink and downlink and transmit or receive data.
As the number of machines is expected to be much larger than HTC devices, an eNB in LTE-A will face too many RA requests from MTC devices.
Without proper access control, the success rate of RA requests from HTC devices could degrade quickly.
Therefore, the focus of this research is to propose a proper random access procedure such that the access success rate of HTC devices will not be affected by the traffic of MTC or access requests from a large number of MTC devices.

In this thesis, we proposed an Adaptive RACH Resource Allocation (ARRA) scheme which integrates several control schemes, include Resource Adjustment scheme, ACB scheme and Priority Device Setting scheme.
Our simulation results show that the proposed ARRA scheme is able to achieve high access success rate and low delay of HTC devices while providing different quality of service (QoS) to different type of MTC traffic.
1 緒論 11
1.1 研究背景 11
1.2 研究動機及目的 13
1.3 研究貢獻 14
1.4 論文架構 14
2 LTE-A 系統 15
2.1 LTE-A介紹 15
2.2 系統架構 17
2.3 系統傳輸技術 18
2.3.1 訊框結構 20
2.3.2 資源區塊 23
2.4 隨機接入 24
3 相關文獻探討 28
4 研究方法 32
4.1 資源調控機制 34
4.2 ACB機制 38
4.3 Priority Device Setting機制 40
4.3.1 Backoff Indicator Setting 40
4.3.2 UL Grant Allocation Setting 41
4.3.3 MSG4 Transmission Setting 41
4.4 系統架構 42
5 模擬結果與分析 44
5.1 模擬環境 44
5.1.1 參數設定 44
5.1.2 Traffic Model 48
5.1.3 碰撞處理 49
5.2 模擬結果 50
5.2.1 模擬輸出參數 51
5.2.2 模擬數據分析 51
6 結論與未來展望 65
7 參考文獻 66
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