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Studies

5GAA publishes test results in support to C-V2X FCC petition for waiver

Recently, the 5G Automotive Association (5GAA) filed a petition for waiver with the Federal Communications Commission of the United States requesting that C-V2X be allowed to operate in the upper 20 MHz (5905 MHz – 5925 MHz) of the US ITS band.

In support of this petition, 5GAA member companies have performed a series of tests in an attempt to address anticipated technical questions related to the favourable implementation of this petition. The report describes the test procedures and results that were undertaken to support the 5GAA C-V2X FCC petition for waiver in the 5.9 GHz band.

The report presents results of testing C-V2X in 20-MHz wide CH183 – the channel that has been recently proposed for C-V2X deployment in the ITS band and is referred to as basic C-V2X Channel and it allows for V2V and V2X messages such as basic safety message (BSM), signal phase and timing (SPaT), signal request message (SRM), signal status message (SSM), and others covered by the Road Safety Message under development in SAE standards. The upper part of the ITS band was chosen to minimize impact to DSRC channels, especially CH172.

The viability of C-V2X in 10 MHz has been demonstrated in a preceding report in which C-V2X has been shown to outperform DSRC in terms of reliability, resilience to out-of-band interference and range. This report extends these results by showing that a BSM message sent in 20‑MHz CH183 has the same reliability as previously shown in 10-MHz CH184.

Both lab and field data included in the report demonstrate consistent results:

  • C-V2X communication in 20-MHz CH183 has the same reliability performance (Packet Reception Ratio vs. distance) as the identical BSM-like message transmission in 10-MHz CH184.
  • Impact of C-V2X high load transmissions in CH183 on DSRC basic safety transmissions in CH172 is negligible up to a 1.4-km range in LOS conditions
  • Impact of C-V2X high load transmissions in CH183 on V2I and I2V transmissions in CH178 is negligible up to a 1.4‑km range in LOS conditions
  • Impact of C-V2X high load transmissions in CH183 on V2I and I2V transmissions in CH180 is negligible up to 1 km in LOS Conditions

 

Read the full report here.

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