  Vehicular networks require vehicles to periodically transmit 1-hop broadcast
packets in order to detect other vehicles in their local neighborhood. Many
vehicular applications depend on the correct reception of these packets that
are transmitted on a common control channel. Vehicles will actually be required
to simultaneously execute multiple applications. The transmission of the
broadcast packets should hence be configured to satisfy the requirements of all
applications while controlling the channel load. This can be challenging when
vehicles simultaneously run multiple applications, and each application has
different requirements that vary with the vehicular context (e.g. speed and
density). In this context, this paper proposes and evaluates different
techniques to dynamically adapt the rate and power of 1-hop broadcast packets
per vehicle in multi-application scenarios. The proposed techniques are
designed to satisfy the requirements of multiple simultaneous applications and
reduce the channel load. The evaluation shows that the proposed techniques
significantly decrease the channel load, and can better satisfy the
requirements of multiple applications compared to existing approaches, in
particular the Message Handler specified in the SAE J2735 DSRC Message Set
Dictionary.
