為因應物聯網的應用，第三代合作夥伴計畫(3rd Generation Partnership Project, 3GPP)與WiFi聯盟分別提出了窄頻物聯網(Narrowband Internet of Things, NB-IoT)與802.11ah技術，其中NB-IoT針對上行排程部分提出改善，以子載波與時槽數目決定排程的長短，以因應以上行為主的物聯網設備，而802.11ah則是提出了限制存取視窗(Restricted Access Window)技術以解決大量設備同時競爭的問題，因此如何解決大量上行資料與設備競爭為一重要議題。 物聯網設備的資料型態可分為週期與非週期性，非週期性資料中以警報資料的延遲性最為敏感，由於當事件發生時大量設備會同時發出警報，造成嚴重競爭進而影響整體延遲時間，故本論文希望改善設備競爭問題降低整體延遲時間，同時協調週期與非週期性資料以提升整體系統效能。 本論文透過LWA(LTE-WLAN Aggregation)架構，結合NB-IoT與802.11ah，協調週期性與非週期性資料的傳送排成，以有效使用無線電資源，降低整體延遲時間，實驗模擬結果也驗證所提出方法可達成以上目標。 ;3GPP and WiFi Alliance proposed the NB-IoT and 802.11ah technology respectively for the IoT application. It improves the scheduling for uplink which determines the length of NPUSCH(Narrowband Physical Uplink Shared Channel) by the number of subcarriers and slots in NB-IoT. This design is for the IoT devices which have more data in uplink. In 802.11ah, it proposed the RAW technology to deal with the contention of massive devices. Therefore, solving the contention and scheduling the data for uplink is the critical issue. The data type of IoT devices can be classified to periodic data and non-periodic data. In non-periodic data, the alarm message is very sensitive to delay time. When the event arrives, massive devices will sent the alarm messages simultaneously and it would cause the severe contention. Furthermore, it would reduce the system performance. So, we propose the new method to reduce the delay time and improving the competitive success rate. In this paper, we integrate NB-IoT and 802.11ah technology based on LWA architecture. We propose the new method to coordinate of periodic data and non-periodic data to reduce the delay time and improving the system performance. The simulation results also verify the proposed method achieves the above objectives.
