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Cooperative Intelligent Transport Systems (C-ITS) make road traffic safer andmore efficient, but require the mobile networks to handle time-criticalapplications. While some applications may need new dedicated communicationstechnologies such as IEEE 802.11p or 5G, other applications can use currentcellular networks. This study evaluates the performance that connected vehiclescan expect from existing networks, and estimates the potential gain ofmulti-access by simultaneously transmitting over several operators. We uploadtime-critical warning messages from buses in Sweden, and characterisetransaction times and network availability. We conduct the experiments withdifferent protocols: UDP, TCP, and HTTPS. Our results show that when using UDP,the median transaction time for sending a typical warning message is 135 ms. Wealso show that multi-access can bring this value down to 73 ms. Fortime-critical applications requiring transaction times under 200 ms,multi-access can increase availability of the network from to 57.4% to 92.0%.

Cellular Network Multi-Access Measurements on the Roads of V\"armland, Sweden