What is the basic difference between piggybacking and multi-hop communications? I am very much convinced that the aforementioned two terms are very different from each other in the sense that the former does not need any re-forwarding and it incurs a small amount of overhead to the message in the form of 'additional information' whereas the later one needs a pure re-forwarding.
For instance in VANETs (Vehicular Ad Hoc NETworks), we could use piggybacking on the beacons where information from previous hop is included into the next scheduled beacon locally. From another angle, there is a multi-hop VANET mechanism where a message, in order to travel farther than a single-hop, it is re-broadcasted according to some known mechanism and the message travels a long distance (For instance an emergency message or a warning message).
Hi Rasheed,
you are right, with piggybacking no need to additional messages (charge=0). The use of existing messages (so that we add some aditionnal fields in the packet format) can ensure information forwarding. But there are two drawbacks of this way:
1/ packets are longer,
2/No Forwarding strategy. For example in piggybackin on beacons, information is kept by the receiver until its time to send the next beacon comes. so performances are affected if the application is time sensitive.
Regards,
Thank you for your reply Doukha. Keeping in mind the overhead with re-broadcasting, piggybacking wouldn't be a bad idea. But we cannot say clearly which one is better. That would totally depend upon the situation. For example, in case of emergency message, multi-hop communication is better because it is time sensitive. Whereas in case of non-safety applications, piggybacking on beacons is better than multi-hop communications. Anyhow, thank you for your reply.
Regards
I agree with you, it depands on the application. some applications use beacons to acknowledge certain packets whitch does not add lots of information (just a sequence number). Keep in mind that beacon are used to provide nodes with neighborhoog knowlegde. so if they are made longer, they can be sensitive to collisions so packet loss.
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