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Routing packets over multiple disjoint paths towards a destination can increase network utilization by load-balancing the traffic over the network. In wireless mesh networks, multi-radio multi-channel nodes are often used to create a larger set of interference-free paths thus increasing the chance of load-balancing. The drawback of load-balancing is that different paths might have different delay...
In this paper we propose the channel assignment scheme for multi-channel wireless mesh network (WMN), where each mesh router is equipped with multiple radio interfaces. In real WMN the number of radio interfaces is much higher than the number of non-overlapping channels, which causes a lot of connections between mesh nodes operate on the same radio channel. Increasing number of simultaneous transmissions...
Wireless mesh networks have seen a real progress due to their implementation at a low cost. Thus, the planning of such networks presents many challenges for network operators. Our aim in this paper is to provide a new planning solution using a multi-objective optimization approach.
Abstract-there are great differences in the operating mode of network coding opportunities routing protocols (NCOR) and traditional routing protocols of wireless mesh networks. It is required to simulate and analysis the network performance in condition of two protocols coexisting. This paper firstly describes the simulation method for wireless routing protocol in NS2, and then presents a multi-routing-protocol...
Abstract-Network Coding Opportunistic Routing (NCOR) methods of wireless mesh networks have the advantage of high throughput and high reliability. However, they suffer problems of higher decoding latency and frequent packet collisions. Also, they have the deficiency in supporting multi-type services. Focusing on the QoS problems of multi-service supporting, we study the optimized NCOR routing methods...
Since Wireless Mesh Networks (WMNs) can be easily deployed without wirelines among wireless mesh routers, they allow us to quickly recover network access services in disaster areas even if the existing network infrastructures have been enormously destroyed by terrible earthquake, tsunami, and so on. However, the performance of wireless mesh networks is largely affected by many factors, e.g., wireless...
Network Coding Opportunistic Routing (NCOR) methods are novel routing methods which can fit the broadcast nature of wireless mesh networks better. They can use the multi-user diversity advantage of the wireless channel and throughput gain of network coding method to alleviate the problems of reliability and capacity of Wireless Mesh Networks. This paper investigates and compares throughput and delay...
In this paper we study the interactions of TCP and IEEE 802.11 MAC in Wireless Mesh Networks (WMNs). We use a Markov chain to capture the behavior of TCP sessions, particularly the impact on network throughput performance due to the effect of queue utilization and packet relaying. A closed form solution is derived to numerically determine the throughput. Based on the developed model, we propose a...
In wireless mesh networks that are built using IEEE 802.11 techniques, there are significant problems in maintaining fairness and low delay to provide QoS for long-hop flows. To address these issues, express forwarding has been proposed. However, existing studies of express forwarding are simulation based, and the main benefits that have been demonstrated are limited to shortened delay for long-hop...
Throughput maximization is a key challenge to numerous applications in wireless mesh networks (WMNs). As a potential solution, cooperative communications, which may increase link capacity by exploiting spatial diversity, has attracted a lot of attention. However, if link scheduling is considered, this transmission mode may perform worse than direct transmission in terms of end-to-end throughput, since...
The provision for addressing multiple destinations in group multimedia application delivery over Wireless Mesh Networks (WMN) can be achieved efficiently via multicasting while considering the mobility of Mesh Clients (MC). One of the prominent components of WMN is the Internet Gateway (IGW) which provides wired bridge connection between the backbone network and the Internet. In addition, its cost...
In contrast to single-hop networks the capacity of wireless mesh networks (WMN) is strictly related to their topology. Therefore predicting the capacity of WMNs is rather complex and requires new tools. A collision domain based method has been used in many papers, since it may be easily fitted to any MAC protocol, routing algorithm, channel allocation method, etc. However, there are other factor influencing...
Opportunistic routing emerged as a novel technique to cope with the problem of highly unpredictable and lossy wireless channels in urban wireless mesh networks. However, existing opportunistic routing protocols only consider single-radio wireless nodes, and assume that all the nodes work on the same channel, without exploiting possible concurrent transmissions by multi-radio nodes over orthogonal...
Devices in wireless mesh networks are often supplied with limited power resources, while also running complex applications with high energy requirements, such as high quality video deliveries over the network. Reducing energy consumption is a key factor when designing a solution for such scenarios. Some existing energy-aware video delivery solutions have been proposed for sensor networks, but they...
Although static mesh networks lack mobility, yet research shows that route breakages are quite frequent for reactive protocols in 802.11-based static mesh networks. In 802.11, a link is considered broken if a fixed number of consecutive transmission attempts fail at link-layer. However, transmissions failures can be temporary and may occur due a number of reasons including collisions on the channel...
This paper proposes UFlood, a flooding protocol for wireless mesh networks. UFlood targets situations such as software updates where all nodes need to receive the same large file of data, and where limited radio range requires forwarding. UFlood's goals are high throughput and low airtime, defined respectively as rate of completion of a flood to the slowest receiving node and total time spent transmitting...
Wireless mesh networks (WMNs) are promising networks in the future Internet environments due to their self-configuration and ease of deployment. Although streaming and real time applications are possible using current mobile devices, these applications still suffer from low quality. Because link failures are not reported in congested situations, the existing routing protocols do not capture these...
In this paper, for improving the performance of Transmission Control Protocol (TCP) over Wireless Mesh Network (WMN), we introduce a new TCP loss recovery algorithm called T-NCE (A Timestamp based detection of Non-Congestion Events) which is able to detect the Non-Congestion events such as transmission errors and packet reordering and differentiate the loss of packets due to transmission errors from...
In a wireless multi-hop or mesh network, stations which are connected to Mesh Access Point (MAP) lesser hops from the gateway are expected to enjoy higher throughput and lower delay than stations connected to the MAP further hops away. To solve this issue, we introduce a technique to determine network layer queue size limit of ingress radio interfaces in the multi-radio MAPs. The intention is to partially...
Wireless mesh networks (WMNs) have recently emerged as a promising technology for next-generation of wireless communications. In WMNs, admission control is deployed to control traffic loads and to prevent the wireless mesh backbone from being overloaded. Existing admission control protocols could be classified as either stateful or stateless approaches, based on network state information. Both the...
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