Wireless Network Planning And Design For Narrow Band Internet Of Things

With the continuous development of mobile communication technologies and the emergence of large-scale Internet of Things,the demand for communication is expanding from human beings to objects and objects.Because the mismatch of existing 2G/3G/4G networks and the Internet of Things in mass connectivity,deep coverage,and low cost,3GPP has defined a new cellular Internet of Things access technology: NB-IoT.At present,domestic and foreign operators have not deployed NB-IoT networks on a large scale.So It should research NB-IoT wireless network planning as soon as possible to guide the project construction.The thesis from the perspective of NB-IoT wireless network planning,studies how to use NB-IoT technology features to plan an efficient NB-IoT wireless network,so as to provide reference for NB-IoT engineering applications.Because NB-IoT has great differences in coverage,capacity and business needs with traditional cellular networks,It cannot fully use existing planning methods for NB-IoT wireless network planning.This thesis studies the key technologies of NB-IoT system,compares and analyzes the basic process and methods of traditional wireless network planning,and summarizes the wireless network planning process and method suitable for NB-IoT.In view of the difference in performance between NB-IoT and traditional cellular network,the thesis makes specific research from several aspects such as feasibility analysis,frequency planning,coverage planning,capacity planning and interference avoidance.Firstly,analyzing the feasibility of NB-IoT wireless network deployment from two aspects;Then analyzes the NB-IoT deployment characteristics and existing network frequency.Through the link budget of the NB-IoT downlink and uplink coverage performance calculation,it puts forward in line with the characteristics of NB-IoT coverage strategy.Then combined with the NB-IoT connection the characteristics of network technology and business distribution,calculated the different scenarios of cell capacity.Finally,there is NB-IoT wireless interference in the deployment process analysis and put forward the corresponding suggestions to avoid interference.A NB-IoT wireless network planning area as an example.Firstly,analysis and forecast the requirement and get few years networking business volume,business distribution and business needs;Then make the NB-IoT wireless network planning from three angles of coverage,capacity and location to determine the preliminary planning site,and wireless network simulation of urban planning scheme are made based on NeST LTE 3.6.8 and China Mobile networking site planning tool.Through the simulation and correction of initial site planning site,NB-IoT continuous coverage and deep cover in the RSRP and SINR of the two indicators have reached the city networking business needs;Finally,estimate the investment of the NB-IoT wireless network construction project in the city,and estimate the investment scale of the project.