Adaptive Data Class Structure for Efficient Inter-Vehicle Communication

Lachlan B. MICHAEL  Ryuji KOHNO  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E85-D   No.11   pp.1830-1838
Publication Date: 2002/11/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Issue on Information System Technologies for ITS)
Category: 
Keyword: 
ad hoc network,  inter-vehicle communication,  layers,  structured data,  ITS,  

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Summary: 
To reduce the bandwidth needed for data transmission in an ad-hoc communication network, such as an Intelligent Transportation System (ITS) inter-vehicle communication network, a broadcast scheme is proposed where the data to be transmitted is arranged into several classes. Each class contains more specific and detailed information. Since information to be transmitted often has a geographical relevance, the classes can be structured to represent this relationship. As data is routed through the ad-hoc network, the total amount of transmitted data is reduced by removing the data contained in one class on each hop. The class structure is adaptive so that in unforeseen situations the relative importance of transmitted data can be dynamically adjusted. Furthermore different manufacturers can implement different classes structures, and total length of data may be different. By computer simulation it was shown that in the proposed system the required bandwidth for transmission to achieve similar data reception rates to conventional non-structured data schemes can be reduced to less than one third, resulting in a more efficient transmission scheme. In addition a packet structure similar to IP packets is proposed which will enable easily integration of multimedia transmissions into vehicle to vehicle communications.