spaper09 - International Journal of Security and its...

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International Journal of Security and its Applications Vol. 2, No. 2, April, 2008 23 System Study of the Wireless Multimedia Ad-hoc Network based on IEEE 802.11g Chung-Wei Lee 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 Abstract 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. This paper 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 ad-hoc mode. Therefore, routing decisions should be made intelligently with the 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 conventional methods. 1. Introduction 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 infrastructure mode).
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International Journal of Security and its Applications Vol. 2, No. 2, April, 2008 24 As the authors in [FKFB05] pointed out, video communication requires the support of
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spaper09 - International Journal of Security and its...

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