Improving the energy efficiency of wireless Network on Chip architectures through online selective buffers and receivers shutdown

The wireless Network-on-Chip (WiNoC) design paradigm represents an emergent and viable solution for addressing the scalability limitations of future manycores architectures. Unfortunately, components such as the buffers and the transceiver of the radio-hubs in a WiNoC, account for a significant fraction of the total communication energy budget. In this paper, we present WIRXSleep, a mechanism aimed at improving the energy efficiency of radio-hubs in WiNoC architectures. WIRXSleep selectively and dynamically disables receiver modules and buffers of those radio-hubs that will be not involved in any communication during the next forthcoming clock cycles. Its application on different WiNoC topologies, with different configurations, and under different traffic scenarios has resulted interesting energy savings (up to 25%) without any impact on performance and with a negligible impact on cost metrics.