|Application Needs

The Emergency Management Department needs to simulate and test the communication channels under various emergency scenarios, including flash floods, earthquakes, fires, hurricanes, and tsunamis in the communication environment, and to achieve dynamic realistic changes of multipath fading, delay and Doppler on the transmit and receive links of emergency response communication equipment corresponding to emergency scenarios. The main demands include.

1) Multi-node network test in different frequency bands;

2) Dynamic transmission delay test;

3) Dynamic Doppler test;

4) Simulation of different geographical and geomorphic environments, such as cities, forests, plateaus and seas;

5) Simulation of communication links in different emergency environments;

6) Simulation of different meteorological environments, such as rain, cloud and atmospheric attenuation;

|Solution

The overall architecture of the solution is to use a 64-channel simulator, and the channel model input is divided into two parts: In one part, drive test acquisition and feedback are made by the outfield acquisition equipment, and channel modeling is carried out by the software; in the other part, the typical emergency environment model is deduced by the IOS protocol. The model files obtained in both ways are loaded into the channel simulator to achieve dynamic simulation of various emergency scenarios and validation of the effect of corresponding communication plans.

Another important application is to divide 64 RF channels into communication groups in different scenarios, corresponding to communication equipment in different frequency bands, which can be single-antenna equipment or multi-antenna equipment, to realize the joint simulation of emergency communication equipment in multiple frequency bands, and to realize the simultaneous transmission of multiple communication groups through the emergency scenario modeling software interface.

In the 500MHz bandwidth scenario, 4 independent communication groups in different frequency bands can be realized, and 16 nodes in each group can be interconnected, specifically as follows:

First group of 16-node network diagram

Second group of 16-node network diagram

Third group of 16-node network diagram

Fourth group of 16-node network diagram

|Challenges

Challenge 1: Model deduction and introduction in different environments. Carry out modelling and theoretical deduction modeling according to the real data measured, and accurately reproduce the outfield real channel environment.

Challenge 2: Hybrid network of communication equipment of different frequency bands in different scenarios. All RF channels should be divided into scenes of different frequency bands for independent settings, and the simulation model can also be divided into different scenes and loaded independently for simulation.

|Functional Highlights

²  Have a model library for a variety of climatic and environmental terrain conditions;

² Have an interface for importing outfield virtual path test models;

²  Have the ability of hybrid networking of communication equipment in different frequency bands;

²  Have the ability to simulate different scenes simultaneously.