A Network Communication Frequency Routing Protocol of Coal Mine Safety Monitoring System Based on Wireless Narrowband Data Communication Network

<table class="table-group" id="tab1"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td class="align_left"> </td><td class="align_center">Frequency (MHz)</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">Lignite</td><td class="align_center">0.29</td></tr><tr><td class="align_left">Fat coal</td><td class="align_center">2.00</td></tr><tr><td class="align_left">Coking coal</td><td class="align_center">2.62</td></tr><tr><td class="align_left">Lean coal</td><td class="align_center">4.89</td></tr><tr><td class="align_left">Anthracite</td><td class="align_center">0.18</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Limit communication frequency of medium.</div>

Mobile Information Systems

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Table 1

Table 1: A Network Communication Frequency Routing Protocol of Coal Mine Safety Monitoring System Based on Wireless Narrowband Data Communication Network 

Table 1 | A Network Communication Frequency Routing Protocol of Coal Mine Safety Monitoring System Based on Wireless Narrowband Data Communication Network 