Network reliability of Wireless Sensor Networks (WSNs) is difficult to be evaluated because of its complexity, multistates, and\ndynamic characteristics. To satisfy the user�s need of reliability evaluation for network transmission we propose some evaluation\nmodels and a dynamical evaluation framework. The evaluation models are mission-oriented and based on transmission paths\n(uplink and downlink). The dynamic evaluation framework can be on-demand customized and it will be auto updated once the\ncommunication environment changes or the nodes fail. Finally, we simulated clustered and mesh WSNs with NS-2. Simulation\nresult shows that the proposed evaluation framework was effective and accurate.
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