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The IEEE 802.16 standard specifies a mesh mode of operation which permits the setup of wireless mesh networks (WMN) with per-link QoS support. The standard specifies both distributed as well as centralized reservation schemes. Distributed scheduling is highly flexible, and enables operation of the WMN even in the absence of a central controlling instance or base station. A systematic study of strategies...
The IEEE 802.16 standard recently introduced an additional relay mode of operation permitting coverage extension of the point-to-multipoint (PMP) based WiMAX networks. Relays can further aid in increasing the achievable data rates for subscriber stations (SS) in the network. Although bandwidth management and scheduling have been studied in some detail in traditional IEEE 802.16 PMP networks, the corresponding...
The simultaneous transmission of data messages to a group of neighbors forms the basis for many essential services in wireless ad hoc and mesh networks, for example to communicate link status information or to assist route discovery. Despite the fact that communication on a wireless medium is inherently of broadcast nature, there exist situations, where data broadcasting is non-trivial. In particular,...
The IEEE 802.16 standard specifies a MeSH mode which permits the deployment of Wireless Mesh Networks (WMNs) supporting carrier-grade QoS. The network operator for such planned WMNs is interested in maximizing the traffic admitted in the WMN and simultaneously supporting QoS. Recently network coding has emerged as a promising technique for increasing the throughput in WMNs. This paper proposes CORE,...
Wireless network coding has the potential to enhance the capacity of wireless mesh networks (WMNs). However, most of the work considering the practical deployment of network coding in WMNs considers only IEEE 802.11 based medium access control (MAC) layers. The recent emergence of sophisticated MAC standards supporting WMNs (e.g. IEEE 802.16) make it necessary to view the deployment issues for network...
Wireless mesh networks (WMNs) build on user nodes to form the network's routing infrastructure. In particular, the correct forwarding behaviour of each intermediate node on a multihop path from a source node to a destination node is crucial for the functioning of the mesh network. However, current secure routing solutions and misbehaviour detection mechanisms are not sufficient and are mostly inapplicable...
The IEEE 802.16 standard represents the state-of-the-art for quality of service (QoS) aware broadband wireless access networks. Initially the standard provided sophisticated QoS mechanisms only for a static network (i.e. stationary subscribers), but recently the amendment IEEE 802.16e-2005 introduced mobility support for the individual subscriber stations. Network entry is the first step required...
The IEEE 802.16-2004 standard specifies wireless broadband networks with optional support for multi-hop mesh operation (mesh mode). The provision and support of high-quality real-time services such as voice over IP is crucial, if wireless networks based on the IEEE 802.16-2004 standard are to challenge wired network services. In this paper we investigate and identify critical factors in enabling real-time...
Mobile ad hoc networks allow for the spontaneous formation of communication networks without dedicated infrastructure. Ad hoc networks are not yet ready for large-scale deployment, because several unsolved research challenges persist. Evaluation methods such as analytical modeling, simulation, emulation, and real world experiments aid in addressing these challenges. There is a strong need for tools...
Today, we witness a transformation of radio access network topologies from strictly tree-structured towards meshed architectures. Yet, these edge networks follow mostly circuit-switched paradigms to support quality of service applications such as voice or video communication. In this work, we develop a novel quality of service aware routing framework to optimize the performance of edge networks in...
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