what are the Measurement in the cloud

The USA has long played a pioneering role in the implementation of location based emergency call services. For example, a mobile phone call to the nationwide emergency number 911 already had to provide GPS-accurate location information in order to guide rescue services and police to the exact location of the incident. At the end of last year, the US regulatory authority FCC further tightened the requirements. By April 2021, the 911 system will be required to transmit vertical location information in addition to 2D coordinates. This would make it possible to quickly identify the floor in question when making emergency calls from high buildings. For reliable identification, the FCC paper (FCCCIRC1911-02) requires a z-axis accuracy of 3 meters. This information cannot be obtained from the GPS data. The FCC specification does not specify a technology, but the tendency is toward barometric pressure sensors in smartphones. There is a functional relationship between air pressure and altitude, but this relationship also depends on the local temperature, humidity and weather conditions (high or low pressure). But temperature and humidity sensors are not currently installed in smartphones, and pressure sensors are only found in top-of-the-range models. The goal is therefore ambitious and can only be achieved with workarounds. Up-to-date information on temperature, humidity and reference pressure on the ground will have to be obtained from external sources. Major US cities have a dense grid of measuring networks. A smartphone will obtain its location values from a server and use this information to determine its altitude – provided its pressure sensor is calibrated. A new Schwarz solution can help verify this feature. Together with an R&S®CMW500 wideband radio communication tester and an optional R&S®SMBV100B GNSS simulator, a small pressure chamber is used to subject the but to defined pressures. The test reveals whether a smartphone can measure the set values with the necessary accuracy (approx. 35 Pascal) and transmit them to the public safety answering point  as specified. In the future, the wireless emergency alert  public safety system that has been in operation in the USA since 2012 will more accurately target specific geographic areas. It uses mobile phone networks to broadcast alerts to the public about imminent threats to public safety, such as an approaching hurricane. It is also used to send alerts issued by the President of the United States and emergency alerts about missing persons. At the end of 2019, the Federal Communications Commission (FCC) published the specifications  3.0, the next development stage of the system. In this update, a message must cover 100 % of a specified target area, which is specified either via a circle (center point and radius) or a polygon. The whole thing is made more demanding by the additional requirement that the boundary of the area must be maintained to within a tenth of a mile. This prevents the alerts from causing unnecessary concern among unaffected citizens. US network operators are meeting the requirements with individual solutions that will eventually have to be implemented in the subscriber devices for their networks. These requirements can be verified using a test solution consisting of the R&S®CMW500, R&S®SMBV100B and R&S®CONTEST software. The solution currently supports the test plans of Verizon, AT&T and US Cellular.