The US Regulatory Healthords Federal Communications Commission (FCC) has implemented its intention published in December 2019: it stops the car consultation WLANP (IEEE specification 802.11p) and makes the way free for other radio applications. FCC boss Ajit Pai charged the step with a long vacancy of the spectrum, the 11p since 2010 exclusive condition.
Because FCC decisions are often towards other regulatory cases, the step also attracts attention in Europe in Europe. In addition, the auto industry is split in two camps: some companies, including the world-growing autoconzers Volkswagen, previously set to 11p, during others the Mobile Technology C-V2X specified in 2017 (Cellular Vehicle-to-Everything). C-V2X Grundet on LTE and 5G.
Both methods, 11p and C-V2X, have been developed in the hope to reduce the accident numbers in the strain traffic. Dafur Networked vehicles warn each other for about sudden brakes or black ice. The techniques states each other, if they work in the same radio. Because the automotive industry has hardly delivered any networked cars due to lack of demand, research and policy want to compete for the networking and prescribe a uniform specification. Worldwide, only a special wiring belt is reserved at 5.9 GHz. In the US, it was firmly bound to 11p.
How much is C-V2x?
Some radio specialists see 11p, however, as a dead end. If two or more vehicles send 11p messages simultaneously, it may come to collisions so that the messages are not delivered. The collisions increase with increasing vehicle density. For techniques that coordinate radio resources, so about LTE or 5G, collisions are only available when relieving a radio cell. Storings through LTE or 5G smartphones are excluded because they stay away from the 5.9 GHz band.
However, C-V2X is not free of criticism. For direct auto-to-auto communication (PC5 interface) you have to accept with C-V2X collisions. Although a secure message delivery works for indirect communication via base stations (UU interface), but this must be sustained. Is open, how expensive that will. It is also unclear how to achieve a base station cars with foreign SIM cards, such as a Vodafone-based messages to be delivered to cars with telecom or o2 or even with foreign SIM cards.
Mobile on the rise
Despite open questions, the FCC has now resigned: Ongoing 11p projects now have one year time, the range of 5850 MHz to 5895 MHz to room. For the car country remain the upper 30 MHz reserved (5895 to 5925 MHz). There is now C-V2X duty. The free 45 MHz is released immediately in unlicited operation in buildings. This comes the WLAN specification 802.11ax benefit (Wi-Fi 6).
In Germany, the Federal Network Agency has awarded the 5.9 GHz band so far technologies-neutral. However, the EU Commission set to 11ps by the summer of 2019. The European Institute for Telecommunications Standards (ETSI) now wants to clear until mid-2022, such as 11p and C-V2X, for example, in separate channels. According to the BNetza until 30. September 2023 take place.
China also relies on C-V2X
China preferred C-V2X and thus LTE and 5G. In Germany, for example, Audi, BMW, Daimler or Deutsche Telekom C-V2X nozzle. VW, however, brought his first golf on the strain only in the summer of 2020. Because of the decision of the FCC, the impression could now arise that VW has set the wrong horse, but the Wolfsburgs give themselves.
Speaker Christian Buhlmann stressed on demand that the 11P benefits were undisputed. Buhlmann, however, contributes: "In parallel, we also rely on C-V2X in the Group. Change for the USA has no immediate impact, as we do not offer with 11p equipped vehicles like the new Golf there." VW North America goes one step further. Mark Gillies responded to demand that the Group subsidiary Audi wants to start in Georgia and Virginia C-V2X field trials.