  Vehicle-to-Everything (V2X) will create many new opportunities in the area of
wireless communications, while its feasibility on enabling vehicular
positioning has not been explored yet. Vehicular positioning is a crucial
operation for autonomous driving. Its complexity and stringent safety
requirement render conventional technologies like RADAR and LIDAR inadequate.
This article aims at investigating whether V2X can help vehicular positioning
from different perspectives. We first explain V2X's critical advantages over
other approaches and suggest new scenarios of V2X-based vehicular positioning.
Then we review the state-of-the-art positioning techniques discussed in the
ongoing 3GPP standardization and point out their limitations. Lastly, some
promising research directions for V2X-based vehicular positioning are
presented, which shed light on realizing fully autonomous driving by overcoming
the current barriers.
