International Journal of Network Security
Wireless sensor networks usually were deployed in remote and hostile surroundings and people cannot attend the sensor nodes. When some nodes are failure, such as batteries exhausted, hardware faulted and intrusion from attackers, these unattended nodes cannot be changed or repaired. The failure nodes may lead to network partition which decreases the cover ratio reduces the availability of the network and even produces network failure. So network topology should tolerate node-failure to avoid network partition. The authors think the following three questions should be answered when researching node-failure tolerance of wireless sensor networks.