Prime Communications Links

Discussion in 'Prime Technical Discussion' started by Old Bear, Nov 12, 2017 at 10:56 PM.

  1. Old Bear

    Old Bear Junior Member

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    Does anyone know how the Prime Advanced communicates with Entune?

    My garage is kind of like a bunker with three 10" concrete walls cut into a hillside. Cell reception is fair to poor due to our being located on the far side of a hill from the nearest tower. Verizon is the dominant carrier and because they own the tower, their antennas are at the top. But they also lease space to the other major cell carriers lower down on the totem pole.

    When I try to get charging status, use the ECO dashboard, or start the climate control from my cellphone, it usually takes a couple of minutes and sometimes fails entirely. Would it be possible put an antenna on the roof of the garage and add some kind of relay device? And, if so, could I use a conventional 4G cellular repeater like this:
    or does Toyota's Entune service use a different cell carrier or satellite link?

    It would be really neat if one could just put a WiFi wireless access point in the garage -- but I doubt that anyone other than Tesla has incorporated that very logical feature.
     
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  2. Elektroingenieur

    Elektroingenieur Active Member

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    The Prius Prime receives GPS positioning and SiriusXM audio entertainment signals from satellites, but it does not transmit to satellites. As Toyota’s New Car Features book (available by subscription to techinfo.toyota.com) explains, communication with Toyota’s Safety Connect service is through the Data Communication Module (DCM), also called the telematics transceiver—a cellular modem.

    Page 553 of the Owner’s Manual (PDF) discloses the FCC ID for the DCM, JOYJ79, which the FCC OET Equipment Authorization database reveals is a Kyocera communication module. (The Canadian registration says it’s a Kyocera AL-S5300NA-V1.) According to documents in the OET database, the module can operate in these bands:
    Band System Transmit Receive
    1 B2 LTE or UMTS/HSPA+ 1850–1910 MHz 1930–1990 MHz
    2 B4 LTE 1710–1755 MHz 2110–2155 MHz
    3 B5 LTE or UMTS/HSPA+ 824–849 MHz 869–894 MHz
    4 B13 LTE 777–787 MHz 746–756 MHz

    I don’t know which bands are actually used, nor the wireless carrier or carriers under contract with Toyota to provide the service, both of which might change during the life of the vehicle. I’ve read in several places that it’s Verizon Wireless, but I couldn’t find an authoritative source for this information. With the right test equipment, it would be trivial to find out, but I think that may be more the realm of Old Crows than @Old Bear.

    A signal booster, if it works in the right band, might improve connectivity, but be sure to read the FCC’s information and Signal Boosters FAQ before buying or installing one. You must register a signal booster with a wireless carrier before operating it; for example, see the Verizon Wireless page about this. It’s not clear to me whether the product you linked complies with the current FCC rules, and the FCC can (and occasionally does) impose forfeitures against users of unlawful equipment when carriers report harmful interference.
     
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  3. SteveMucc

    SteveMucc Junior Member

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    What you want is something called a femto-cell. I assume that you have some type of internet service that's not cellular based in your house. If so you want a small home based cell tower that connects to the internet using your home boardband service.

    Now the big question is what carrier Toyota uses for it's telematics backhaul, and if will allow a roaming connection. If it doesn't allow roaming, then you'll have to be very specific about which carriers femto-cell you purchase.

    In any case, this should fix your problem (and also give you full 5-bars in your house as well).
     
  4. pilotgrrl

    pilotgrrl Active Member

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    According to the document I found, "We (Toyota) work with many different companies, individuals and government entities to provide you with your Services. Specifically, wework with Cross Country Motor Club, Inc., to provide roadside assistance, Verizon Wireless to provide Wi-Fi hotspot services and data connectivity to your vehicle, and Sirius XM Connected Vehicle Services Inc. (“Sirius XM CV”), to provide customer support and the other services that are a part of your System and Service Plan."

    This is from the Telematics Subscription Service Agreement PDF, which I can't link to from my phone.

    OP would need a Verizon femtocell, if such a thing is available.


    Posted via the PriusChat mobile app.
     
  5. priuscatprimeguy

    priuscatprimeguy Senior Member

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  6. pilotgrrl

    pilotgrrl Active Member

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  7. CharlesH

    CharlesH CA HOV Decal #5 on former PiP

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    Don't let the reference to "Sirius XM" in the above text confuse you. This has nothing to do with Sirius XM satellite services like XM Radio. It is a completely unrelated service provided by the Sirius/XM company that you get connected to via the built-in Safety Connect cell phone (via Verizon) when you push the SOS button.
     
    #7 CharlesH, Nov 15, 2017 at 9:46 PM
    Last edited: Nov 15, 2017 at 10:02 PM
  8. CharlesH

    CharlesH CA HOV Decal #5 on former PiP

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    I was wondering what protocol they supported. Verizon is discontinuing CDMA in 2019, and I was hoping that the Safety Connect module used LTE, so the Safety Connect system wouldn't become a brick in 2019.
     
    #8 CharlesH, Nov 15, 2017 at 9:50 PM
    Last edited: Nov 15, 2017 at 10:01 PM
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