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

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td class="align_left"> </td><td class="align_center">Transmission (DB)</td><td class="align_center">Loss (%)</td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left">Turn loss</td><td class="align_center">6.38</td><td class="align_center">11.02</td></tr><tr><td class="align_left">Longitudinal conductor</td><td class="align_center">5.92</td><td class="align_center">9.13</td></tr><tr><td class="align_left">Conductor and roadway</td><td class="align_center">7.15</td><td class="align_center">4.95</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Loss at a turn in propagation.</div>

Mobile Information Systems

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Table 4

Table 4: A Network Communication Frequency Routing Protocol of Coal Mine Safety Monitoring System Based on Wireless Narrowband Data Communication Network 

Table 4 | A Network Communication Frequency Routing Protocol of Coal Mine Safety Monitoring System Based on Wireless Narrowband Data Communication Network 