Research Article
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 | — | — |
|
|