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Community Wireless Networks can be a way to make “Internet access for everyone” possible, by sharing a broadband Internet connection via WLAN. The underlying idea is to freely provide network access to anybody in the vicinity of the wireless access point via a Lower-than-Best-Effort (LBE) service, such that non-paying users interfere as little as possible with the “regular” Internet usage. Such a...
Nowadays, every one want to use cell phone and access internet from anywhere at home, office or public place due to rapid growth of Electronic and Telecommunication industry. Due to these demands the analysis of signal propagation inside and outside building is necessary. The outdoor propagation is simple as compared to indoor propagation. This paper models the path loss coefficient and general expression...
The rapid development of mobile platforms enables new approaches to improve the operational efficiency of the wireless response systems (WRS). This investigation aims at achieving a solution in term of simple and fast operations for WRS. Two prototypes of different architectures are developed using Flex Builder and iPhone SDK respectively. The testing devices used are the latest handheld devices,...
In this paper, we introduce and evaluate ScaleMesh, a scalable miniaturized dual-radio wireless mesh testbed based on IEEE 802.11b/g technology- ScaleMesh can emulate large-scale mesh networks within a miniaturized experimentation area by adaptively shrinking the transmission range of mesh nodes by means of variable signal attenuators. To this end, we derive a theoretical formula for approximating...
A scheme that exploits the broadcast nature of the wireless communication in order to achieve multicast content delivery is presented in this paper. As opposed to broadcasting, this method enables the clients to determine on-line the delivered content, and thus preserves the advantages of an individual service. On the other hand, a multicast content delivery is much more efficient than a unicast content...
With recent improvements in physical layer (PHY) techniques, the achievable capacity for wireless LANs (WLANs) has grown significantly. However, the overhead of IEEE 802.11 MAC layer has limited the actual throughput of a WLAN. A-MPDU aggregation suggested in IEEE 802.11n draft is a key enhancement reducing the protocol timing overheads that enables aggregation of several MAC-level protocol data units...
In this paper, we propose an adaptive pacing scheme at the link layer for IEEE 802.11 based multihop wireless networks. Our objective is to improve the performance of higher layer protocols without any modifications to them. Our adaptive pacing scheme estimates the four-hop transmission delay in the network path without incurring any additional overheads, and accordingly paces the packets to reduce...
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