Optimization of Wireless Communication Coverage in Underground Tunnels Based on Zone Division

Table 10

Average field power in different propagation regions (in dBm): coverage in the narrow tunnel.

Coverage strategy	Position of CO			Position of WC			Position of WW
	Propagation region
	DP-MM to DP-FBP	DP-MM to DP-SI-H	DP-MM to DP-SI-V	DP-MM to D	DP-MM to DP-SI-H	DP-MM to DP-SI-V	DP-MM to DP-FBP	DP-MM to DP-SI-H	DP-MM to DP-SI-V
900 MHz-narrow tunnel
Strategy-MM	−41.13	—	—	−31.15	—	—	−32.37	—	—
Strategy-SM	−41.93	—	—	−31.15	—	—	−32.37	—	—
Strategy-FBP	−41.93	—	—	−40.14	—	—	−38.74	—	—
Strategy-SI-H	−41.93	—	—	−40.14	—	—	−38.74	—	—
Strategy-SI-V	−41.93	—	—	−40.14	—	—	−38.74	—	—
Strategy-H	−41.93	—	—	−40.14	—	—	−38.74	—	—
Strategy- V	−41.13	—	—	−31.15	—	—	−32.37	—	—
433 MHz-narrow tunnel
Strategy-MM	−30.53	−32.99	−32.01	−25.27	−25.14	—	−24.65	—	—
Strategy-SM	−33.04	−30.25	−29.40	−25.27	−25.14	—	−24.65	—	—
Strategy-FBP	−33.04	−30.25	−32.32	−26.55	−25.76	—	−24.85	—	—
Strategy-SI-H	−30.53	−32.99	−32.01	−25.42	−25.76	—	−24.85	—	—
Strategy-SI-V	−33.04	−30.25	−29.40	−26.55	−25.76	—	−24.85	—	—
Strategy-H	−33.04	−30.25	−29.40	−26.55	−25.76	—	−24.85	—	—
Strategy-V	−30.53	−32.99	−32.01	−25.27	−25.14	—	−24.65	—	—