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We investigates MAC layer performances of traditional RoF-based and newly emerging Pico BS-based WiMax networks. It is shown that the latter is preferred for the throughput and delay while the former has the merit of physical simplicity.
Wireless mesh networks (WMN) provide network access for mobile users. Therefore, most traffic flows in WMNs are to and from the wired networks. Some mesh nodes, called Gateways connect directly to the wired networks, through which mesh clients can access the resources that reside on the wired networks. However, there are usually only a few of Gateways in a WMN. The packet processing ability of every...
Wireless mesh networks (WMNs) have emerged as a promising and cost-effective approach to extending the coverage range of wireless local area networks (WLANs) and providing last-mile broadband Internet access. Mesh routers and mesh clients are the key components of WMNs. Mesh routers perform the dual tasks of forwarding packets as well as providing network access to mesh clients. Mesh routers facilitated...
With the growing demands for computer network communication, it becomes increasingly important to secure the data flow path. The existing research related to security mechanisms only focuses on securing the flow of information in the communication networks. There is a lack of work on improving the performance of networks to meet quality of service (QoS) constrains for various applications. The security...
In this paper, we present a centralized quasi-static channel assignment for multi-radio WMNs (wireless mesh networks) to provide high-throughput paths. We probe data packets at each wireless access point and estimate the traffic load for each network link using a new load estimation algorithm. So the channel assignment can intelligently assigns channels with the objective of maximizing the aggregate...
Wireless Mesh Networks (WMNs) support the cost-effective broadband access for Internet users. Although today's IEEE 802.11 PHY and MAC specifications provide multi-channel and multi-rate capabilities, exploiting available channels and data rates is a critical issue to guarantee high network performance. In multi-rate wireless networks, high-rate links heavily suffer from performance degradation due...
Multihop wireless mesh networks (WMNs) are considered a promising technology to backhaul heterogeneous data traffic from wireless access networks to the wired Internet. WMNs are expected to support various types of applications with diverse quality of service (QoS) requirements, such as end-to-end packet delay, throughput, and packet-error-rate (PER). Recent works in this area are mainly concentrated...
Typically, VoIP traffic is deployed as best-effort traffic over Internet links. This voice traffic lacks effective and scalable end-to-end congestion control. We propose a new VoIP congestion control scheme called Voice-TFCC (voice TCP-friendly congestion control), that tries to keep the transmission protocol overhead to a minimum while maintaining a TCP-friendly throughput. Voice-TFCC adjusts packet...
In order to reduce the increasing packet loss rates caused by an exponential increase in network traffic, the Internet engineering task force is considering the deployment of active queue management techniques such as RED (random early detection). While active queue management in routers and gateways can potentially reduce packet loss rates in the Internet, this paper has demonstrated the inherent...
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