International Journal of Security and its Applications
Vol. 2, No. 2, April, 2008
System Study of the Wireless Multimedia Ad-hoc Network
based on IEEE 802.11g
Department of CS, University of Illinois, Springfield, IL, USA
Jonathan C.L. Liu and Kun Chen
CISE Department, University of Florida, Gainesville, FL, USA
Yu-Chee Tseng and S.P. Kuo
College of Computer Science, National Chiao-Tung University, Hsin-Chu, Taiwan
The construction of a wireless multimedia ad-hoc network needs to go across the mixed
environment with the indoor, the wall-penetration, and the outdoor condition.
presents our contribution to address the system design aspects of a multimedia-enabled
network based on IEEE 802.11g ad-hoc mode.
There are distinct differences between indoor
and outdoor environment and penetrating the walls stressed the system limit of the 802.11g
environmental respect to maximize the bandwidth support on the end-to-end paths.
By investigating the experimental results of the average throughput with the 802.11g ad-
hoc mode, we have collected the different performance characteristics among the indoor, the
wall-penetration and the outdoor environment.
Via the experiments and analyses, we have
observed that the ad-hoc mode had the worst performance within 5 meters in indoor
environments. In outdoor environments, TCP seemed to favor either short distance (e.g., 5
meters) or long distance (e.g., 25 meters).
On the other hand, the best performance UDP has
achieved with the distance of 10 meters.
When the wall-penetration occurs, it is important
that the routing nodes in the building edge areas are placed close-by within 5 meters.
Given the solid evidences from the baseline experiments, we have embedded the heuristic
algorithms into the routing decisions.
We have thus simulated a large area of 300 meters by
300 meters with hundreds of routing nodes.
After investigating over 100 (randomly-
generated) topology scenarios, the performance results indicate that our proposed scheme
produces the higher-bandwidth paths for most of the cases.
Even in the less-dense cases, our
proposed schemes still can find the better paths with bandwidth about 30% higher than the
Many places (especially rural areas or military battlefields) are lack of the support of
access points or base stations.
Thus, a wireless multimedia network will not be complete
without the support of the ad-hoc mode. Ad-hoc networks do not go through the conventional
network infrastructures like access points/base stations or routers.
Thus the routing functions
need to be provided by the peer nodes in the middle of the paths.
Building an ad-hoc network
imposes more difficulty since the communication relies solely on the ad-hoc mode (instead of