United States Department of Transportation
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DSRC-Unlicensed Device Test Plan: To Characterize the Existing Radio Frequency Signal Environment and Identify the Impacts to DSRC Operations of Unlicensed Devices Operating in the 5850-5925 MHz Band and Adjacent Bands
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2015-08-01
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[PDF-2.47 MB]
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Edition:Version 3.5.3
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Abstract:The U.S. Department of Transportation (USDOT) concern is focused on anything that disrupts Dedicated Short-Range Communications (DSRC). By this definition then, Radio Interference can take three forms: (1) the increase in ambient noise level due to unlicensed devices transmitting in or near the DSRC band; (2) when two or more packets from different sources enter a receiver at the same time - in that case, the receiver may accurately interpret only one, or likely none, of the incoming message packets - those messages are transmitted but lost; and (3) when the Clear Channel Assessment (CCA) mechanism causes a radio to suppress and not send its message because it hears another source already transmitting on the channel - a secondary or unlicensed user preventing a primary user from transmitting in this way is considered to be interfering with the primary user’s ability to communicate by the USDOT - messages are not received because they are prevented from being sent. The USDOT needs to understand the impacts of unlicensed devices operating in the DSRC band in order to provide recommendations through the National Telecommunications and Information Administration (NTIA) to the Federal Communications Commission (FCC). The FCC may use these inputs to make decisions that will avoid interference with and ensure reliable operation of DSRC as well as ensure highly available access to the DSRC band. The USDOT will undertake the bench and lab testing, field testing, simulation and analysis described in this test plan. The sections of this report first provide the goals and objectives, then an overview of the plan by phases, followed by sections that detail the planned measurements.
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