WissTek: Paper published at I2TS 2005

I2TS 2005: Wisstek logo

Paper published at I2TS 2005: Capacity and QoS of Wireless Mesh Networks

A paper written by me, David Gallego, Michel Yacoub, Alvaro Medeiros, Paulo Cardieri and Elvio Leonardo about capacity and QoS of wireless mesh networks was accepted and published at the 4th International Information and Telecommunication Technologies Symposium (I2TS 2005).

Abstract

The Wireless Mesh Networks (WMNs) are particular types of ad hoc networks where the data traffic is forwarded to or from a gateway connected to other networks. As ad hoc networks, the WMNs provide good reliability, scalability and low infrastructure investments, which grants a market appeal to this technology. But there always is a tradeoff between the number of hops the packets have to travel to reach their final destination in a WMN network and the interference the node experience. The frequency band and the network topology have direct influence on quality of service parameters, like delay and lost packets ratio, and regulate the capacity of the network. This paper investigates how some properties of the physical channel affect the quality of service and the capacity of a WMN.

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WissTek: Paper published at SBrT 2005

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Capacity of Wireless Mesh Networks in Fading-Affected Environments

Abstract

A particular type of ad hoc networks, the Wireless Mesh Network (WMN), is drawing considerable attention in recent studies. The WMNs provide good reliability, scalability and low infrastructure investments, which grants a market appeal to this technology. Because of the specific characteristics of the WMN’s traffic, the capacity and quality of service parameters of this this type of network have been studied, but in most cases, considering a simple propagation environment. This paper studies, through computational simulation, how some properties of the physical channel affect the quality of service and the capacity of a WMN.

* Paper written in Portuguese.

WissTek: Paper published at IMOC 2005

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Performance of IEEE 802.11 in Wireless Mesh Networks

Abstract

This paper addresses the performance of the IEEE 802.11 MAC protocol in a wireless mesh network. The aim is to assess under which conditions the protocol’s performance might be acceptable, in particular for delay sensitive traffic. A number of different scenarios is considered, with varying number of gateways, different sizes for the group of users, as well as different transmission and carrier sensing ranges. It is shown that the IEEE 802.11 performs poorly on heavy traffic, in particular for data flows subject to multiple hops. In addition, the protocol fails to dispense the available bandwidth fairly to the requesting nodes. Improvements can be obtained by minimizing the number of hops required for the traffic to reach its destination. This can be achieved by increasing the number of gateways. Another alternative is to increase the transmission range, at the cost of spatial reuse. However, the latter option only translates into better performance if the carrier sense range is also decreased.

You may purchase this paper at the IEEE Xplore.

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