Improving routing protocols of WSN in WHSN

Battery consumed node is typical in wireless sensor networks, but in the newly developed applications in household, we have found a new character that some nodes could be deployed inside the household appliances and use AC as its power supply, which are called as plug-in nodes. Unlike battery consumed nodes, they could transmit data without the limitation of energy consumption, which is a key challenge of traditional WSNs. In this paper, we introduced the wireless home sensor networks with the plug-in nodes. By taking the advantage of plug-in nodes for energy consumption free, we discussed and modified traditional protocols in WHSN, such as LEACH, SPIN and DD, brought out LEACH-Pi, SPIN-Pi and DD-Pi, by modifying their voting, assessment, and routing algorithms to greatly improve their performance, life time and response time of network, and energy consume.