Unidirectional Link-Aware DTN-based sensor network in building monitoring scenario

The performance of wireless sensor network in building monitoring system (BMS) is often deteriorated by intermittently-connected and unidirectional links occurring in building environment. With DTN-based approach, Potential-based Entropy Adaptive Routing (PEAR) protocol can achieve high reliability and scalability over intermittently-connected mesh network in the building scenario. However, the result of high delivery latency caused by ignoring the presence of unidirectional links may not be acceptable in BMS. In this paper, we propose Unidirectional Link-Aware Next-hop Selection (ULANS), the technique of detecting unidirectional links and the new next-hop selection scheme for PEAR. The real-world experimental result shows that ULANS can avoid choosing unidirectional links as the next-hop and improve delivery latency of PEAR.