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Wireless Sensor networks (WSNs) are constructed of sensors with awareness and limited energy whose topologies are set up by the signals strength being emitted. In general, the signals transmitted are usually not in uniform distribution, which lead to the living sensors having unequal residual energies. The energy holes might be emerging in WSNs since of some sensors failure. We study static WSNs with two initial energy levels. Assume that the sensors acting as base stations will never be failure and the other sensor nodes have limited energy. Adjusting hierarchical topology, using relay nodes or the density of sensors, the emergence of the energy holes would be delayed vs reduced. The separateness between data collection and data processing is also considered to balance the energy dissipation of transmission. We propose three routing algorithms named Density_Sep, SecCluHead_Sep and Relay_Sep for improving cluster head (CH) selection in legacy SEP routing protocol in WSNs. Then we briefly explained that our algorithms could be completed in polynomial time. The simulation results obtained support that our algorithms are efficient in terms of network lifetime and balancing network energy consumption.
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