Panichpapiboon, Sooksan

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Efficient broadcasting in IEEE 802.11 networks through irresponsible forwarding
(2009-12-01)
Busanelli, Stefano
;
Ferrari, Gianluigi
;
Panichpapiboon, Sooksan
In a self-organizing vehicular network, vehicles share and distribute information by rebroadcasting a received information packet to their neighbors. An efficient broadcast technique can offer a high reactivity without sacrificing the communication reliability. Therefore, broadcast techniques are particularly suitable for safety-related vehicular transmissions, whose goal is reaching reliably the widest area in the shortest time. Among the numerous solutions appeared in the literature, the probabilistic broadcast approaches seem to be promising and not yet accurately analyzed. Since the interaction between a high level broadcasting protocol with the lower layers cannot be ignored, in this work we analyze the behavior of a recently proposed broadcast technique, denoted as the Irresponsible Forwarding (IF), in IEEE 802.11 networks. Our attention concentrates on the Medium Access Control (MAC) layer, which is affected by some critical impairments for broadcasting, such as the hidden terminal problem and self-interference. In this work, we evaluate the benefits brought by the use of IF to perform efficient broadcasting in IEEE 802.11 networks.
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Route reservation in ad hoc wireless networks
(2007-01-01)
Panichpapiboon, Sooksan
;
Ferrari, Gianluigi
;
Wisitpongphan, Nawaporn
;
Tonguz, Ozan K.
This paper investigates whether and when route reservation-based (RB) communication can yield better delay performance than non-reservation-based (NRB) communication in ad hoc wireless networks. In addition to posing this fundamental question, the requirements (in terms of route discovery, medium access control (MAC) protocol, and pipelining, etc.) for making RB switching superior to NRB switching are also identified. A novel analytical framework is developed and the network performance under both RB and NRB schemes is quantified. It is shown that if the aforementioned requirements are met, then RB schemes can indeed yield better delay performance than NRB schemes. This advantage, however, comes at the expense of lower throughput and goodput compared to NRB schemes. © 2007 IEEE.
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Connectivity of ad hoc wireless networks: An alternative to graph-theoretic approaches
(2010-04-01)
Panichpapiboon, Sooksan
;
Ferrari, Gianluigi
;
Tonguz, Ozan K.
Connectivity in wireless ad hoc and sensor networks is typically analyzed using a graph-theoretic approach. In this paper, we investigate an alternative communication-theoretic approach for determining the minimum transmit power required for achieving connectivity. Our results show that, if there is significant multipath fading and/or multiple access interference in the network, then graph-theoretic approaches can substantially underestimate the minimum transmit power required for connectivity. This is due to the fact that graph-theoretic approaches do not take the route quality into consideration. Therefore, while in scenarios with line-of-sight (LOS) communications a graph-theoretic approach could be adequate for determining the minimum transmit power required for connectivity, in scenarios with strong multipath fading and/or multiple access interference a communication-theoretic approach could yield much more accurate results and, therefore, be preferable. © Springer Science+Business Media, LLC 2009.
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Irresponsible forwarding
(2008-12-01)
Panichpapiboon, Sooksan
;
Ferrari, Gianluigi
In a self-organizing traffic information system, vehicles share and distribute the traffic information by rebroadcasting a received information packet to their neighbors. However, it is inefficient to let every vehicle rebroadcast the information packet, since the redundant packets waste the valuable (finite) radio channel bandwidth. Reducing the number of redundant packets, while still ensuring good coverage and reachability, is one of the main objectives in multi-hop broadcasting. In this paper, we propose a new probabilistic-based rebroadcast scheme, denoted as Irresponsible Forwarding, where each vehicle rebroadcasts a received information on the basis of (i) its distance from the source and (ii) the density of its neighbors. The key idea is that a node implicitly evaluates the probability that there is another node which can rebroadcast more successfully: if this probability is sufficiently high, then the node "irresponsibly" does not rebroadcast. Unlike the other existing probability assignment schemes, our scheme also takes the statistical distribution of the vehicles on the road into consideration. Moreover, it will be shown that, for sufficiently large values of the vehicle spatial density, the average number of rebroadcast packets can be regulated by properly tuning a single parameter. © 2008 IEEE.

Panichpapiboon, Sooksan

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