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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/16699
Title: | NR車用網路的安全群播 Reliable Groupcast For NR V2X |
Authors: | Yan-Teng Kuo 郭彥滕 |
Advisor: | 魏宏宇(Hung-Yu Wei) |
Keyword: | 群播,車用網路,新無線,資源分配, V2X,New Radio,Resource Allocation,Groupcast, |
Publication Year : | 2020 |
Degree: | 碩士 |
Abstract: | 隨著自動駕駛汽車的發展,高可靠性和低延遲的車輛通訊技術變得越來越重要。第三代合作夥伴計劃(3GPP)特別討論新無線(NR)下的邊緣連結(SL)傳輸,目的是滿足低延遲,高可靠性和高流通量的車聯網(V2X)要求。與僅支持廣播方案的長期演進技術(LTE)V2X相比,NR V2X還支持兩種方案:單播和群播。群播方案允許發射機一次與同一群中的多個接收機進行通訊。在本論文中,我們呈現了NR V2X模式2的盲重傳。為了保持傳輸的可靠性,車輛群的大小需要被限制,以避免由於非直視性(NLOS)傳輸而引起的錯誤。並且,為了提高傳輸的可靠性,本文提出了一種優化群接受率的重傳方法,可以使發射機在同一群中分配一個重傳裝置進行重傳。我們設計了一個重傳裝置選擇問題,旨在最大程度地提高NR V2X模式2群播的群接收率(GPRR)。模擬的結果顯示,所提出的重傳方法從GPRR、分組間接收時間(PIR)和可靠性限制下的車輛群大小方面改善了車聯網群播。 With the development of autonomous vehicles, the high reliability and low latency vehicular communication technologies has become more important. The Third Generation Partnership Project (3GPP) specifies the sidelink (SL) transmission based on New Radio (NR) structure, which aims to meet the the low latency, high reliability and high throughout vehicle-to-everything (V2X) requirements. Compared with Long Term Evolution (LTE) V2X which only supports broadcast use cases, NR V2X supports two more scenarios: unicast and groupcast. The groupcast operation allows the transmitter to communicate with multiple receivers in same group at once. In this paper, we present the blind retranmission operation for NR V2X mode 2. To maintain the transmission reliability, the group size for vehicles is restricted to avoid errors due to Non-line-of sight (NLOS) transmission. In order to improve the transmission reliability, this paper proposes a optimized group packet reception ratio retransmission, which allows transmitter to assign a retransmission UE in same group to perform the retransmission. We formulate a retransmission UE selection problem, which aims to maximize the group packet reception ratio (GPRR) for NR V2X mode 2 groupcast. The simulation results show that the proposed retransmission method improves the V2X groupcast in terms of GPRR, packet inter-reception time (PIR) and the available group size. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/16699 |
DOI: | 10.6342/NTU202002840 |
Fulltext Rights: | 未授權 |
Appears in Collections: | 電機工程學系 |
Files in This Item:
File | Size | Format | |
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U0001-1008202016545200.pdf Restricted Access | 778.78 kB | Adobe PDF |
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