Vehicular Ad Hoc Networks: Current Issues and Future Challenges ◾ 349
hazards, etc. Also, there should be some aggregated information about sender’s neighbors.
In addition, by including security issues that are very important in intervehicle communica-
tion, we can reach packet sizes ranging from 100 to 500 bytes for each message. Generally,
safety messages with the size of 1 Kbyte are not far from expectation. An example of works
that consider an increase of packet payload size (and simultaneously decreasing transmission
frequency) is that of [51], which will be discussed briefly in the following subsections.
◾ Control of dissemination pattern: In IEEE 802.11p when the MAC layer is given a packet to
disseminate, it starts the process of