Research Article
Optimization of Wireless Communication Coverage in Underground Tunnels Based on Zone Division
Table 1
Examples of wireless coverage optimization scheme in underground tunnels.
| Research group | Optimization scheme | Characteristics | Limitations |
| Li and Wang [9] | Antenna beam width and antenna deployment | (1) Use antennas with narrow beam width | Optimal configuration of antenna parameters is not given | (2) Deploy antennas on proper locations | Zhao et al. [10] | Antenna diversity | Use spatial and polarization diversities of two antennas | (1) Optimization is limited by antenna locations | (2) Scheme cannot be adjusted dynamically as the user moves | Zhou et al. [11] | Antenna polarization | Use the horizontally polarized antenna to communicate | (1) Scheme cannot be adjusted dynamically as the user moves | (2) Optimization is restricted to the case where the receiver is in the far-field region of the transmitter | Bashir [12] | Antenna deployment | Consider the interaction of the effects of antenna polarization and location on field propagation | (1) Optimization is limited by antenna locations | (2) Scheme cannot be adjusted dynamically as the user moves | (3) Optimization is restricted to the case where the receiver is in the near-field region of the transmitter | Huo et al. [13] | Antenna deployment | Consider the different effects of antenna polarization on field propagation in the near-field and far-field zones | (1) Optimization is limited by antenna locations | (2) Scheme cannot be adjusted dynamically as the user moves |
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