Re: [ipwave] PC5 at 5.9GHz - modules

Alexandre Petrescu <> Wed, 31 March 2021 13:17 UTC

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From: Alexandre Petrescu <>
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Subject: Re: [ipwave] PC5 at 5.9GHz - modules
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For information,

Me and a colleague have looked independently at the pdf of devices for

My goal is to identify the best possible C-V2X miniPCIe card that is
supported in linux.

By reputation, maybe the Unex is the most likely to offer one such card.
  A few of us already worked with Unex cards in the past, but for ITS-G5.
  But Unex card for C-V2X at 5.9GHz is not yet available to acquire
easily (like e.g. buying on Amazon or alibaba).

I wait for easy availability because of the risk of what might happen at 
customs.  The regulation of C-V2X spectrum in Europe and in the country 
where I live is far from straightforward: it is not clear in Europe 
whether or not C-V2X technology is allowed at 5.9GHz.  BEcause of that 
uncertainty the customs prices can skyrocket easily (add up to double to 
the original price).

We wait.


Le 26/01/2021 à 17:41, Alexandre Petrescu a écrit :
> I was provided in private the 5GAA's list of PC5 capable devices.  It
> is a public document whose links clicked ok in OCtober 2020; the
> document is at URL 
>  Some of the links no more work.
> The document is sorted by: chips, modules, OBUs, RSUs, etc.
> The chips are from: Autotalks, Huawei, Qualcomm.
> The modules are from: SimCOM, muRata, Quectel, WNC, LG Innotek, ZTE, 
> Neoway, Unex, Datang, Alps Alpine.
> A promising chips to try might be the those who say 'linux' and 'Mode
> 4' (a kind of LTE equivalent of 802.11 'ad-hoc' mode).  Because the 
> software driver in linux would be freely available and the Mode 4
> would be the mode not needing SIM card.
> I am not sure though whether or not there are currently linux
> drivers available freely for 'Mode 4' implementations?
> Alex
> Le 24/01/2021 à 13:48, Alexandre Petrescu a écrit :
>> Hi, IPWAVErs,
>> Is there cheaply available hardware to make work PC5 at 5.9GHz?
>> PC5 is a part of 5G specs that deal with direct communications
>> between vehicles, presumably without SIM cards and without the
>> involvement of a Mobile Network Operator (MNO).
>> For my part, I think no, there is no PC5 hardware at 5.9GHz.
>> It is very likely, I think, that PC5 hardware (modems, interfaces) 
>> might use a very different PHY layer than what 802.11-OCB uses.
>> That might be the 'New Radio' (NR) of 5G.  NR is incompatible with
>> 802.11 PHY layer.
>> There are no 5.9GHz bands, no spectrum, allocated neither in USA
>> by FCC nor in Europe by the Commission, for 'C-V2X' or for 'PC5'
>> even though there might have been a request for comments ('an
>> 'NPRM') at FCC in USA in that sense.  That NPRM did not lead to
>> allocating 5.9GHz spectrum for C-V2X.  It is one year now since
>> that NPRM closed.
>> Currently, all 5.9GHz bands are fully allocated to 'DSRC' (or,
>> 802.11 if you wish, or 'ITS-G5').
>> However, I was pointed by a vehicle manufacturer to a router 
>> manufacturer (Comsignia, see
>>  description that states that one feature is "DSRC and C-V2X (PC5)
>>  communication interfaces".  The price of that OBU is not
>> displayed, but I suspect it to be in the range of a couple thousand
>> euros, which can still be affordable, even though not for a series
>> car whose price might be highly affected.
>> Also, I was pointed to a recent cheap hardware "AirPrime® EM9190
>> 5G NR Sub-6 GHz and mmWave Module" which lists the following
>> bands: "Sub-6: n1, n2, n3, n5, n7, n8, n12, n20, n25, n28, n38,
>> n40, n41, n48, n66, n71, n77, n78, n79, mmWave: n257, n258, n260,
>> n261".  In this list, there are not the bands 'n46' and 'n47',
>> which are the bands for 5.9GHz.
>> This brings me the question: is there cheap hardware for PC5 at 
>> 5.9GHz?
>> Alex
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