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

Table 7

Location of dividing point (in m).

Method	Receiver Position
	C	CC	CO	WC	WW
900 MHz-wide tunnel
MM	—	—	293.28	307.97	308.70
SM	—	—	274.20	248.60	317.30
FBP	77.98	77.98	77.98	77.98	77.98
SI-H	143.50	200.90	350.70	454.30	469.70
SI-V	46.90	91.70	101.50	95.90	76.30
433 MHz-wide tunnel
MM	—	—	67.53	70.92	71.09
SM	—	—	62.18	57.21	83.76
FBP	37.51	37.51	37.51	37.51	37.51
SI-H	13.30	51.10	67.90	62.30	69.30
SI-V	120.30	38.50	118.30	94.50	94.50
900 MHz-narrow tunnel
MM	—	—	61.30	63.22	59.76
SM	—	—	—	>34.80	>34.80
FBP	25.66	25.66	25.66	25.66	25.66
SI-H	—	—	—	—	—
SI-V	—	—	—	—	—
433 MHz-narrow tunnel
MM	—	—	13.75	14.50	13.64
SM	—	—	—	17.19	14.34
FBP	12.34	12.34	12.34	12.34	12.34
SI-H	5.40	7.20	13.20	13.80	—
SI-V	—	7.20	3.60	—	—