IEEE802.11p ahead of LTE-V2V for safety applications.pdf

IEEE802.11p ahead of LTE-V2V for safety applications
There are several relevant facts important to highlight when comparing IEEE802.11p to LTE-V2X:
• IEEE802.11p is ready now, LTE-V2X is not [4]. Today, IEEE802.11p-based products are available on the market
from multiple silicon vendors. Some Tier1s have complete solutions available. In contrast, there is no LTE-V2X
product available in the market today, and it will most likely take several years before a complete solution will be
ready and tested. The promised 5G version of V2X will have an even longer time horizon;
• IEEE802.11p is already installed in cars on the road. An end-user can buy a vehicle (e.g. GM Cadillac1
) equipped
with IEEE802.11p technology today;
• The V2V NPRM has been published [1]. It clearly indicates that the US Government apparently has the intention
to deploy IEEE802.11p as a technology thoroughly tested, validated and available for safety critical applications;
• IEEE802.11p mass deployment could begin soon. Volkswagen, one of the largest car manufacturers worldwide,
         publicly announced that from 2019 onwards, they will equip their first model series with IEEE802.11p technology2
.
The cellular community is advocating that V2X implementations should wait for cellular technology to be ready and
tested, and disregard the investments and field tests done to validate IEEE802.11p for safety critical applications.
More concretely, the cellular community claims that LTE-V2X offers:
• a strong cellular eco-system which leverages years of experience in providing paid-services and a mature technology available worldwide. This is a valid argument, but it refers to entertainment services in a cellular-based
technology. The communication between a device and a base-station is fundamentally different from the deviceto-device communication in a dynamic environment;
• twofold better performance [6]. However, it is IEEE802.11p which outperforms LTE-V2X in important V2V use
cases as we show in this article;
• minor added cost. This is questionable as the support of safety critical applications strongly indicates the need to
separate those from the entertainment SW and HW. Therefore, LTE-V2X will likely be physically separated from
the cellular modem