Highly Efficient Multicast over Surface Wave in Hybrid Wireless-Optical On-Chip Networks for IoT HPC

Abstract

As an ideal platform for Internet of Things (IoT) High Performance Computing (HPC), the Network-on-Chip (NoC) implements the parallelized task processing of Intellectual Property (IP) cores. However, the data interaction of IoT HPC has increased exponentially, resulting in highly consumed energy and bandwidth of the electrical NoC. This problem can be solved by the Optical NoC (ONoC), but the flexibility should be further improved for the multicast message transmission. We design a novel hybrid wireless-optical on-chip network with an effective routing mechanism for the message multicast transmission of IoT HPC. We utilize the wireless single-hop transmission to reduce on-chip communication distance and to forward multicast messages. For the high attenuation on-chip wireless signal, we design an on-chip surface waveguide structure for the surface wave as a more reliable wireless transmission medium. A flexible routing mechanism is also proposed to ensure efficient coordination between optical and wireless layers, thus relieving the pressure of the single-layer message transmission. The simulation results show that, compared with the traditional ONoC using mesh topology, our scheme performs better in terms of average delay, average energy consumption, and network throughput.