Local heuristic for the refinement of multi-path routing in wireless mesh networks

We consider wireless mesh networks and the problem of routing end-to-end traffic over multiple paths for the same origin-destination pair with minimal interference. We introduce a heuristic for path determination with two distinguishing characteristics. First, it works by refining an extant set of paths, determined previously by a single- or multi-path routing algorithm. Second, it is totally local, in the sense that it can be run by each of the origins on information that is available no farther than the node's immediate neighborhood. We have conducted extensive computational experiments with the new heuristic, using AODV and OLSR, as well as their multi-path variants, as underlying routing methods. For two different CSMA settings (as implemented by 802.11) and one TDMA setting running a path-oriented link scheduling algorithm, we have demonstrated that the new heuristic is capable of improving the average throughput network-wide. When working from the paths generated by the multi-path routing algorithms, the heuristic is also capable to provide a more evenly distributed traffic pattern

NEW APPROACH FOR NEIGHBOR DISCOVERY IN MOBILE AD HOC NETWORKS

Multipath directing permits building and utilization of numerous ways meant for routing among a resource and destination pair. The resource repetition misuses and difference in the primary network to give profit, for example, fault tolerance, load balancing, data transfer aggregation, as well as change in QoS measurements, for example, interruption. The three components to a path discovery, multipath routing, path maintenance and traffic distribution. Path discovery includes discovering accessible ways utilizing predefined criteria. A well known metric is way disjointness, a measure of resource contrasting qualities between paths. Traffic dispersion system describes how simultaneously accessible ways are utilized, and how data to the same goal is part and flowed over diverse ways. Path support specifies when and how new paths are procured if the states of at present accessible paths change. We display a choice of these protocols and give a discussion on how multipath strategies might be stretched out to wireless mesh networks. In conclusion we quickly portray the path selection structure in the current proposal for IEEE 802.11s mesh standard. Despite the fact that the proposal does not characterize utilization of multipath routing, its extensible system for path selection gives procurement to such protocols to be implemented

Protocol design and optimization for QoS provisioning in wireless mesh networks

Wireless Mesh Network (WMN) has been recognized as a promising step towards the goal of ubiquitous broadband wireless Internet access. By exploiting the state-of-the-art radio and multi-hop networking technologies, mesh nodes in WMN collaboratively form a stationary wireless communication backbone. Data between clients and the Internet is routed through a series of mesh nodes via one or multiple paths. Such a mesh structure enables WMN to provide clients high-speed Internet access services with a less expensive and easier-to-deployment wireless infrastructure comparing to the wired counterparts. Due to the unique characteristics of WMN, existing protocols and schemes designed for other wellstudied wireless networks, such as Wi-Fi and Mobile Ad-hoc Network (MANET), are not suitable for WMN and hence cannot be applied to WMN directly. Therefore, novel protocols specifically designed and optimized forWMNare highly desired to fully exploit the mesh architecture. The goal is to provide high-level Quality-of-Service (QoS) to WMN clients to enable a rich portfolio of wireless and mobile applications and scenarios. This dissertation investigates the following important issues related to QoS provisioning in WMN: high throughput routing between WMN clients and the Internet, fairness provisioning among WMN clients and network-level capacity optimization. We propose innovative solutions to address these issues and improve the performance, scalability and reliability of WMN. In addition, we develop CyMesh, a multi-radio multi-channel (MRMC) wireless mesh network testbed, to evaluate the capacity and performance of WMN in real world environments. Extensive simulation (using the QualNet simulator) and experimental (over the CyMesh testbed) results demonstrate the effectiveness of the designed protocols. In particular, we learn that the system capacity of WMN can be improved significantly by exploiting the MRMC network architecture and the antenna directionality of radios equipped on mesh nodes, and our proposed fulfillment based fairness is a reasonable notion for fair service provisioning among WMN clients. Moreover, we report the encountered problems, key observations and learned lessons during the design and deployment of CyMesh, which may serve as a valuable resource for future MRMC WMN implementations

Multipath Selection in Multi-radio Mesh Networks

Research has shown that multi-radio multi-channel mesh networks provide significant capacity gains over single-radio mesh networks [10, 20, 21]. Traditional single path routing can lead to poor utilization of the available channels in these networks. Opportunistic multipath routing can better exploit the available channel diversity in a multi-radio network. The goal of this paper is to select multiple paths that, when used concurrently, provide high end-to-end throughput. To this end, we present a metric for multipath selection in multiradio networks. We evaluate the metric through simulations in Qualnet and show that intelligent multipath routing significantly outperforms single path routing in multi-radio mesh networks. 1