In-car Mobile Signal Attenuation Measurements
This study was conducted by LS telcom UK and Siroda for Ofcom and involved using drive tests to measure the attenuation of mobile signals in different frequency bands caused by a representative range of different vehicle types. The key objective of the study was to better understand the effect of vehicle signal losses and improve in-vehicle road coverage predictions for mobile services.
The measurements involved the use of four high speed TSMW scanners attached to different antennas; one mounted on the roof of the vehicle, and three in different positions within the vehicle (dashboard, console and foot-well). All of the four scanner measurements were made at the same time to enable the level of attenuation caused by the vehicle in different locations within the vehicle to be compared.
Eight different vehicle types were used in the tests, and their attenuation was measured along the same 100km route through Berkshire which included a mix of urban, suburban and rural areas. This approach enabled mobile signal level data to be captured across all the mobile frequencies of interest; 800 MHz, 900 MHz, 1800 MHz, 2100 MHz and 2600 MHz.