Test your eCall and ERA-Glonass system modules
The R&S®CMW500 and R&S®SMBV100A are the ideal team for testing your eCall and ERA-Glonass cellular modems and GNSS receivers in the lab.
- eCall/ERA-Glonass data transfer principle.
The European Union and the Russian Federation aim to have intelligent telematics-based vehicle safety systems in place to speed up emergency response times in order to save human lives. eCall and ERA-Glonass are electronic safety systems for cars. In the event of a serious road accident, they automatically call the single emergency call number 112 for local emergency medical services in the EU and the Russian Federation respectively. They can also be manually activated.
In case of an accident, the eCall/ERA-Glonass in-vehicle systems (IVS) initiate an in-band modem data transfer to the local public safety answering point (PSAP) via the cellular network. The IVS transfers a standardized minimum set of data (MSD) containing information such as the number of passengers, the timestamp and the GNSS coordinates of the accident. Additionally, a voice connection is established, as the car occupant(s) might be able to speak.
The ERA-Glonass system is harmonized with the European eCall standards but specifies some extensions to better support the Russian infrastructure. This includes additional SMS functionality for the MSD transfer in case in-band data transmission fails.
eCall and ERA-Glonass in-vehicle systems consist of several components, including an in-band modem with antenna (such as for GSM or UMTS) for sending the emergency call, a GNSS receiver for determining the accident location, crash sensors for detecting the accident, a microphone and loudspeaker for voice communications, an emergency power supply and a pushbutton for manual activation.
As a safety system, the in-band modems must be highly reliable and correctly transmit MSD data. This is particularly critical in cellular networks optimized for voice transmissions such as GSM or WCDMA. Testing eCall and ERA-Glonass system components or overall system performance in real-world mobile network and satellite environments can easily become time-consuming, costly and very challenging. And as environmental conditions might change, test results are hardly reproducible.
Rohde & Schwarz offers a compact solution for reproducible end-to-end functional and standard-compliant conformance testing of eCall and ERA-Glonass modules. The R&S®CMW‑KA094 eCall application software and the R&S®CMW‑KA095 extension for ERA-Glonass simulate a PSAP and remotely control the R&S®CMW500 to emulate a cellular network in the lab.
They also control the R&S®SMBV100A vector signal generator, which provides the GNSS coordinates required by the IVS to compile the MSD. This setup makes it possible, for example, to verify if the IVS modem is able to trigger an emergency call, send the correct raw MSD data and establish a voice connection with the PSAP – fully independently of any real-world mobile network.
To verify whether the IVS modules are in line with the applicable standards, the R&S®CMW500 also tests MSD transmission timing, MSD decoding including GNSS position and, in the case of ERA-Glonass, MSD transmission triggering via SMS. Not only must the IVS module conform to eCall and ERA‑Glonass specifications, its GNSS receiver must be accurate and able to determine correct coordinates even under weak signal conditions. As a fullfledged satellite simulator for GNSS, the R&S®SMBV100A is also the ideal instrument for testing the capabilities of GNSS receivers.
The R&S®SMBV100A can simulate a wide variety of scenarios, from simple setups with individual, static satellites to flexible scenarios generated in realtime with up to 24 dynamic GPS, Glonass, Galileo, BeiDou and QZSS satellites. Both stationary geographic positions and moving scenarios that simulate the movement of the receiver, i.e. a car, along any user-defined route are possible.
To simplify extensive conformance tests, the R&S®CMW‑KT110 CMWrun sequencer software tool is added. It provides ready-to-use test sequences for eCall and ERA-Glonass modules in line with CEN/TS 16454 and GOST55530 respectively. Required test sequences are conveniently selected and combined on the straightforward user interface. R&S®CMWrun automatically configures the R&S®CMW-KA094/-KA095 PSAP application software via remote control to execute the selected tests. It creates a complete test report with pass/fail indication for each IVS module. The ability to verify compliance with standards at an early design stage makes it possible to take corrective action and optimize an IVS module in a timely manner.
The R&S®CMW-KA094/-KA095 PSAPs with the R&S®CMW500 and SMBV100A test instruments and the R&S®CMW-KT110 CMWrun application are a compact solution for testing the functionality and standard-compliant conformance of your IVS modules in the lab. The test instruments are a future-ready investment and can be upgraded to meet upcoming test requirements.
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