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    Title: 毫米波5G系統之波束管理技術研究;Beam management techniques for mm wave 5G systems
    Authors: 方建中;FANG, CHIEN-CHUNG
    Contributors: 通訊工程研究所
    Keywords: 5G;波束形成;移動;轉動;Wireless Insite;波束恢復;換手;5G;beamforming;displacement;rotation;Wireless Insite;beam recovery;handover
    Date: 2017
    Issue Date: 2019-07-17 10:47:53 (UTC+8)
    Publisher: 通訊工程研究所
    Abstract: 隨著4G(4th generation)通訊發展成熟,5G(5th generation)通訊也成為世界矚目焦點,在毫米波(mmWave)5G系統中,傳送端和接收端都需要形成波束(beamforming)來彌補高的路徑衰減。天線數越多代表所形成的波束越細,可以擁有更遠的覆蓋範圍(coverage),但是波束越細在傳送波束和接收波束之間的對準性越難維持,不論是使用者的使用行為(轉動、移動)或是環境的變化(遮障, blockage),都有可能嚴重的影響波束間的對準性進而造成接收功率的損失。本論文基於射線追蹤(raytracing)技術,以工研院開放辦公室為背景建立了一個特定位址(site specific)的模型來進行波束管理之研究。本論文主要探討使用者在旋轉、移動下對於波束恢復(beam recovery)效能和冗餘(overhead)的影響。研究結果顯示(1)使用者如果保持一組由多個同樣的傳送波束但不同接收波束的波束配對鏈路組成的波束配對鏈路集合,可以延長12%的波束恢復間之時間而且使用者和基地台吞吐量也有些許改善,(2)換手次數也會因為波束配對鏈路集合的大小變大而降低,(3)在室內辦公室環境中使用波束恢復門檻為-5 dB相較於-3 dB,可以在不損失太多使用者吞吐量情況下也可延長171%的波束恢復間之時間,及(4)在室內辦公室的環境中如果一個基地台下10個使用者同時通訊的話會因為干擾太大造成outage機率太高,而一個基地台下3個使用者會比較合適在使用者移動的情況中,使用者在有換手程序的情況下outage機率可以下降5%且使用者吞吐量也會有所提升,結果也顯示移動比轉動所需要的換手次數更多,所以基地台之間的合作是必須的,以減少換手的冗餘。
    With the successful deployments of 4G (4th generation) systems around the world, the design of 5G (5th generation) systems has come into focus. Highly directional beamforming antennas are necessary at both the transmitter and receiver to compensate for the high path-loss in the mm-wave frequency band. Nevertheless, beam alignment can be easily destroyed by small variation in device behaviors such as rotation and displacement especially for systems with narrow beams, and that degrades significantly the link performance.In this thesis, we discuss the effects of beam recovery performance and overhead under UE rotation and displacement in an indoor environment in which the ray-tracing technique is used to model the channel characteristics. Our results show that (1) keeping multiple beam pair links under the same TX beam within the beam pair link set not only can extend the inter recovery time by 12% but also increase the UE and TRP throughput slightly. (2) Number of handover can be reduced as UE keeps multiple beam pair links within the set. (3) Recovery threshold can be set as -5 dB without losing too much performance but extending the inter recovery time by 171% , as compared to -3 dB in the indoor office environment. (4) If there exists 10 serving UEs per TRP and communicate simultaneously will case heavily interference resulting in too high outage probability, therefore 3 is a proper number of serving UE per TRP in the considered indoor scenario. And, (5) with UE moving around, handover operation can decrease the outage probability by 5% and enhance the UE throughput. In addition, the number of handover under UE displacement is larger than rotation, so the coordination between TRP is needed to reduce the overhead of handover.
    Appears in Collections:[Institute of Communications Engineering] thesis

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