Scheduling for MU-MIMO wireless industrial sensor networks

Wireless sensor networks have been widely used in industrial environment. High reliability and real-time requirement are two main characteristics of wireless industrial sensor networks. Each flow can be transmitted to its destination on time by allocation node’s transmission slots. However, when transmission conflict occurs, the flow may miss its deadline and generate errors. To address this issue, we introduce MU-MIMO technique into industrial networks and propose a heterogeneous network model. Based on this model, we propose a slot analyzing algorithm (SAA) to guarantee the schedulability of networks. In considering of network cost, SAA also reduces the number of MU-MIMO nodes by slot analyzing. Evaluation results show the effectiveness and efficacy of our approach.