談物聯網必須注意到一個新的通訊技術，可省電甚至利用通訊來充電。
https://www.sigmobile.org/mobicom/2014/talks/slides_9_2.pdfBackscatter - Ultra Low-power Communication Primitive. Backscatter ... Backscatter is extremely efficient because the device is reflecting ...
The past few years have seen a dramatic growth in wireless sensing systems, with millions of wirelessly connected sensors becoming first-class citizens of the Internet. The number of wireless sensing devices is expected to surpass 6.75 billion by 2017, more than the world's population as well as the combined market of smartphones, tablets, and PCs. However, its growth faces two pressing challenges: battery energy density and wireless radio power consumption. Battery energy density looms as a fundamental limiting factor due to slow improvements over the past several decades (3× over 22 years). Wireless radio power consumption is another key challenge be- cause high-speed wireless communication is often far more expensive energy-wise than computation, storage and sensing. To make matters worse, wireless sensing devices are generating an increasing amount of data.....
A promising technique to address these questions is backscatter — a primitive that enables RF energy harvesting and ultra-low-power wireless communication. Backscat- ter has the potential to reduce dependence on batteries because it can obtain energy by rectifying the wireless signals transmitted by a backscatter reader. Backscatter can also work by reflecting existing wireless signals (WiFi, BLE) when these are avail- able nearby. Because signal reflection only consumes μWs of power, backscatter can enable ultra-low-power wireless communication.
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