دانلود رایگان مقاله انگلیسی باند محدود اینترنت اشیا: شبیه سازی و مدل سازی - IEEE 2017

Abstract

As a new type of Low Power Wide Area technology, the Narrow Band Internet of Things (NB-IoT) technology supports wide coverage and low bitrate services, thus it has a great potential to be the future commercial technology of Low Power Wide Area Network (LPWAN). Therefore, it has attracted attention of both academia and industry. In this paper, we present the NB-IoT development, and main characteristics and design objectives of NB-IoT according to 3GPP R13. In addition, we provide the review of related literatures about NB-IoT modeling and algorithm analysis. And we explain current problems of NB-IoT system-level modelling based on visualized simulation platform. Moreover, this study is devoted to construction of NB-IoT model based on OPNET and verification of its characteristics, such as wide coverage and high channel utilization. This study mainly considers NB-IoT model design and realization in terms of NB-IoT physical layer characteristics. We summarize the correlated characteristics of NB-IoT uplink and downlink. Then we design and construct the NB-IoT model based on Long Term Evolution (LTE) network. Lastly, we use the constructed NB-IoT model for simulations and conduct an experiment on it using the LTE network with channel bandwidths of 3 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz. The simulation results have verified the performance of NB-IoT, wherein uplink time delay is lower than 10 s, channel utilization is higher than that of LTE network, and coverage area is larger than LTE network.

 CONCLUSION

This article introduces a development of NB-IoT technology and its main characteristics and design objectives according to 3GPP R13. In addition, the related literature about NBIoT modelling and algorithm analysis is presented. Then we explain current problems of NB-IoT system-level modelling based on visualized simulation platform. Nevertheless, this paper constructs a NB-IoT model based on OPNET, and verifies its characteristics, such as wide coverage, high channel utilization, and etc.. In this study, we focused on model design and realization aiming at physical layer characteristics of NB-IoT. We analyzed correlated uplink and downlink characteristics of NB-IoT, and designed and constructed the NB-IoT model based on LTE network. Lastly, we used the constructed NBIoT model to perform simulations, and we compared NB IoT network with LTE network under channel bandwidth of 3 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz. The simulation results have verified the NB-IoT performance defined by 3GPP, that NB-IoT uplink time delay is lower than 10 s, channel utilization is higher than in LTE network, and coverage area is larger than in LTE network. The discussions and modelling presented in this paper aim to provide a comprehensive overview and big-picture of exciting solutions on this subject. In our future work, we will continue to design and improve the NB-IoT model based on OPNET. Nevertheless, we will further improve and optimize air interface layer, access network and core network of NB-IoT based on LTE network, in order to reach the expected requirements.