Hierarchical Optical Access Switching Networking With Distributed Edge Nodes for IoT

For converging and switching huge amounts of multisource heterogeneous sensing data in the Internet of Things (IoT), we propose a hierarchical optical access switching networking (HOASN) architecture, the access domain of which is interconnected by passive optical distributing nodes (PODNs), distributed edge nodes (ENs) including sensing accessing interfaces. The structures of PODN, EN and SFM are proposed. And then, a cyclic signaling mechanism and a dynamic bandwidth allocation algorithm are proposed to realize pipelined transmission slot allocation and make full use of the uplink channel bandwidth resources. The simulation shows that the HOASN improves the throughput 6.9% and 10.7%, and reduces the latency 16.4% and 35.3% for converging and switching sensing data in uplink channels, compared with two traditional Ethernet optical access schemes, respectively. Finally, we design and develop an EN prototype based on ARM Cortex-A72 series chip, set up a HOASN experimental system with two prototypes interconnected in the lab, and implement it in the Power IoT Demonstration Project in Tongli, Suzhou, China. All results show that the HOASN scheme can realize converging and switching with high throughput and low latency for sensing data.