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Dedicated short-range communications are one-way or two-way short-range to medium-range wireless communication channels specifically designed for automotive use. DSRC uses the 5.9 GHz band allocated by the US govt.

Does a smart phone need any additional hardware to send/receive data using this wireless communication protocol?

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Very likely, yes, as it's not the same protocol as 802.11a (even if you could get the 5ghz radio onto the right band)

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