The radio inside a connected car
Telematics puts a factory-fit T-Box or an aftermarket terminal on the car for GNSS positioning, remote control, vehicle-status reports, FOTA/SOTA, and in-car entertainment. Passenger cars, commercial vehicles, and new-energy vehicles all need an automotive-grade 4G or 5G module if they are to stay online 7×24. SimtoLink modules for this work are 4G / 5G, AEC-Q100 automotive-grade, with UART and SPI. The company supports 500+ enterprise customers and has connected more than 10 million in-vehicle devices.
Factory-fit, aftermarket, and a car that talks to the road
A T-Box from the factory, a terminal fitted later, a battery pack, and a V2X link do not share a delay budget. These are the usual telematics jobs, and the radio that tends to fit.
A factory-fit T-Box
An OEM T-Box uses 4G or 5G for remote control, vehicle status, and FOTA/SOTA. The phone app and the connected-car services sit on that link, which is what keeps drivers using them.
BMS and charging on a new-energy vehicle
The BMS, charge state, and remaining range go to the automaker's platform through the module. Battery health, a reserved charge, and remote diagnosis are what the driver of an electric vehicle expects.
IVI on the center screen
The center screen goes online over 4G or 5G for music, navigation, and video. SOTA and content pushed to the car ride the same link.
V2X
A 5G module carries V2X — V2V, V2I, and V2N — for vehicle-road coordination, traffic, and driver assistance. That is the link a connected car uses when the road itself is part of the system.
Commercial fleets
A commercial T-Box reports position, fuel, CAN bus data, and driving behavior. Dispatch, safety, and a TMS link all use that report.
What a car that crosses borders asks of the module
- Coverage as the car moves: Several operators, several bands, and international roaming are what hold coverage.
- Automotive grade on a factory fit: A pre-installed module needs AEC-Q100 and IATF 16949 if it is to meet in-vehicle reliability.
- Temperature and vibration: −40°C to 85°C, and resistance to vibration, for a long life in the vehicle.
- The vehicle's own bus: CAN/CAN FD, GNSS, and the host MCU, over TCP, UDP, MQTT, and DoIP.
- A path a Tier 1 can build: SimtoLink modules cover 4G and 5G, with documentation, an SDK, and production supply, including Tier 1 integration.
Which radio fits a factory T-Box
Bandwidth, delay, and whether the part has to be automotive-grade do not line up the same way for a factory T-Box and an aftermarket dongle. Factory-fit or aftermarket, the function, and coverage across regions should decide the module. The rows below are the usual pairing in a car.
| Job | Radio | What matters |
|---|---|---|
| Factory-fit T-Box, IVI | 4G 5G | Automotive-grade AEC-Q100, remote control, FOTA/SOTA, a wide pipe |
| Aftermarket in-vehicle terminal | 4G | Position, the track, a geofence, driving behavior, industrial grade |
| V2X, vehicle-road coordination | 5G | Low delay, high reliability, C-V2X, traffic |
| New energy vehicle BMS | 4G | Automotive grade, BMS reports, charging, remote diagnosis |
How SimtoLink fits a telematics program
For cars, the modules are automotive-grade or industrial, hold temperature and vibration, and come with technical support 7×24. 4G is the recommendation for a T-Box, an aftermarket terminal, and a new-energy vehicle. 5G is for a higher-end car, V2X, and IVI, where the pipe has to be wide. An SDK a vehicle team can bring up quickly, work with mainstream chip vendors, and a named account manager come with the module.
A vehicle program is taken from the requirements and the radio choice, through a prototype on one model, and into volume. Documentation, the AT command set, an SDK, and sample code ship with the module, and supply is planned for a production run and for the years the car stays on the road. Connected cars and vehicle-road coordination keep adding units that need a radio, and the module line will follow that.
How a telematics project usually moves
A telematics project usually moves in this order:
The choice turns on factory-fit or aftermarket (factory-fit wants automotive-grade AEC-Q100), the function (control, entertainment, diagnosis, or V2X), and coverage across regions (several operators, international roaming). Start on one model and check the module and the link into the automaker's platform. A factory T-Box should use automotive-grade 4G or 5G. Aftermarket can use an industrial module.
The radio in the car is what the driving experience, assisted driving, and mobility services stand on. SimtoLink has supplied modules to OEM automakers, Tier 1 suppliers, and aftermarket makers.