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ECPR: Environment- and Context-aware Combined Power and Rate Distributed Congestion Control for Vehicular Communications | | Bengi Aygun
; Mate Boban
; Alexander M. Wyglinski
; | | Date: |
31 Jan 2015 | | Abstract: | Safety and efficiency applications in vehicular networks rely on the exchange
of periodic messages between vehicles. These messages contain position, speed,
heading, and other vital information that makes the vehicles aware of their
surroundings. The drawback of exchanging periodic cooperative messages is that
they generate significant channel load. Decentralized Congestion Control (DCC)
algorithms have been proposed to control the channel load. However, while the
rationale for periodic message exchange is to improve awareness, existing DCC
algorithms do not use awareness as a metric for deciding when, at what power,
and at what rate the periodic messages need to be sent in order to make sure
that the hard-to-reach vehicles are informed. We propose ECPR, an environment
and context-aware DCC algorithm, which combines power and rate control to
improve cooperative awareness by adapting to both specific propagation
environments (such as urban intersections, open highways, suburban roads) as
well as application requirements (e.g., different target cooperative awareness
range). Using the current context that the vehicle operates in (e.g., speed,
direction, and application requirement), ECPR adjusts the transmit power of the
messages to reach the desired awareness ratio at the target distance while at
the same time controlling the channel load using an adaptive rate control
algorithm. By performing extensive simulations, including realistic propagation
and environment modeling and realistic vehicle contexts (varying demand on both
awareness range and rate), we show that ECPR can increase awareness by 20%
while keeping the channel load and interference at almost the same level. When
the awareness requirements allow, ECPR can improve the average message rate by
18% compared to algorithms that perform rate adaptation only. | | Source: | arXiv, 1502.0054 | | Services: | Forum | Review | PDF | Favorites | |
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