Research Article
A Cognitive Radio-Based Energy-Efficient System for Power Transmission Line Monitoring in Smart Grids
Table 1
A comparison of the notable features of existing and proposed system models.
| Communications technology | Wireless sensor nodes (ZigBee, Bluetooth) | Hybrid network (WSN + cellular) | CR 802.22 WRAN (proposed) | Features |
| Network topology | Linear | Linear | Star (clustered) | Energy efficiency considered in design | x | x | ✓ | Overall network energy efficiency | Low (unbalance workload) | Low (unbalance workload) | High (balanced workload) | Network lifetime | Low | Low | High | Data rate | Low | High | High | Communication range | Low (few hundred meters) | Service coverage dependent | High (33–100 km) | Spectrum type | Unlicensed | Licensed | Unlicensed | Spectrum cost | Free | High | Free | Uncontrolled interference | ✓ | ✓ | x | Wideband spectrum | x | x | ✓ | Time delay | High | Moderate | Low | Power adaptation | x | x | ✓ | References | [3–12] | [13–15] | [4, 17] |
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