  Millimeter wave (mmWave) technologies will support the high bandwidth and
data rate requirements of V2X services demanded by connected and automated
vehicles (CAVs). MmWave V2X technologies will leverage directional antennas
that challenge the management of the communications in dynamic scenarios
including the identification of available links, beams alignment, and
scheduling. Previous studies have shown that these challenges can be reduced
when mmWave communications are supported by side information like the one
transmitted in sub-6GHz V2X technologies. In this context, this paper proposes
a beamwidth-aware mmWave scheduling scheme for V2V communications supported by
sub-6GHz V2X technologies. The proposal enables mmWave transmitters to schedule
a mmWave transmission to several neighboring vehicles at the same time by
adapting the beamwidth configuration. In addition, the proposal derives the
minimum beamwidth that mmWave transmitters should use to contact their
neighboring vehicles in a limited number of scheduling intervals. The obtained
results demonstrate that the proposal helps increasing the amount of mmWave
data that can be transmitted to neighboring vehicles.
