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

Table 9

Average field power in different propagation regions (in dBm): coverage in the wide 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 DP-FBP	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-wide tunnel
Strategy-MM	−49.85	−55.26	−50.41	−49.83	−55.37	−50.26	−43.14	−50.35	−43.09
Strategy-SM	−50.36	−55.26	−50.99	−47.94	−55.37	−48.22	−43.21	−50.88	−43.09
Strategy-FBP	−51.88	−55.26	−52.33	−51.42	−55.37	−51.32	−48.41	−50.35	−48.53
Strategy-SI-H	−49.85	−64.65	−50.41	−49.83	−61.27	−50.26	−43.21	−56.16	−43.09
Strategy-SI-V	−51.55	−55.26	−52.33	−50.80	−55.37	−51.32	−48.41	−50.35	−48.71
Strategy-H	−51.88	−55.26	−52.33	−51.42	−55.37	−51.32	−48.41	−50.35	−48.71
Strategy-V	−49.85	−64.65	−50.41	−49.83	−61.27	−50.26	−43.21	−56.16	−43.09
433 MHz-wide tunnel
Strategy-MM	−37.11	−43.95	−44.41	−38.44	−40.51	−42.97	−32.68	−35.78	−41.60
Strategy-SM	−37.40	−43.95	−44.41	−37.37	−42.02	−42.97	−32.68	−35.78	−41.35
Strategy-FBP	−39.68	−43.95	−44.41	−38.73	−42.02	−42.97	−38.34	−37.34	−41.60
Strategy-SI-H	−37.11	−42.62	−44.40	−38.45	−42.02	−42.97	−32.74	−37.34	−41.60
Strategy-SI-V	−37.11	−49.54	−51.40	−38.44	−40.51	−49.83	−32.68	−35.78	−41.86
Strategy-H	−39.68	−43.95	−44.41	−38.73	−42.02	−42.97	−38.34	−37.34	−41.60
Strategy-V	−37.11	−49.54	−51.40	−38.44	−40.51	−49.83	−32.68	−35.78	−41.86