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Recently, physical layer (PHY) caching at the base station (BS) has been proposed to induce MIMO cooperation among peer BSs to reduce interference and improve the spectrum efficiency in the radio access network (RAN). Compared with caching at the core network (CN) gateway (CN-caching), which covers a large number of users, it may appear that PHY-caching covers less users and results in lower cache...
Thanks to their flexibility and their simplicity of installation, Wireless Mesh Networks (WMNs) allow a low cost deployment of network infrastructure. They can be used to extend wired networks coverage allowing connectivity anytime and anywhere. However, WMNs may suffer from drastic performance degradation (e.g., increased packet loss ratio and delay) because of interferences and congestion. Generally,...
The special communication scenario in High-Speed Train (HST) not only leads to an increasing demand of high throughput and continuous multimedia services but also arises many other challenges for cellular network access technology, such as high mobility, frequent and group handovers etc. In order to address above problems, we propose an HST WiFi network application scheme which adopts multi-hop technology...
A wireless mesh employing directional antenna, termed DMesh in this paper, can greatly extend coverage and improve spatial reuse of wireless channels. As beaming direction of the antennas changes network topology which in turns affects routing and channel decisions, we address in this work how to jointly optimize topology (in terms of beaming directions of antennas), routing and channel assignment...
We consider the channel assignment problem in wireless mesh networks. Due to the limited number of radio interfaces that each node is equipped with, channel assignment must ensure that the interface constraint is obeyed, i.e., the number of different channels assigned to the links incident on a node must be no greater than the number of interfaces the node is equipped with. However, interface constraint...
Because of existence of the interference, WMNs' end-to-end throughput usually is not very ideal. In order to solve this problem, this paper design an topology algorithm which via combining collision domain load and power control to structure network topology and optimize network throughput. The algorithm adjust each node transmission power to a reasonable leve after construct the network topology,...
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.
This paper presents the design and performance evaluation of an integrated hybrid MAC and topology control scheme (abbreviated IMTC) for machine-to-machine (M2M) area networks that require comparatively the high data rate communications. In order to maximize the network performance, IMTC is designed with a cross-layer concept of MAC and network layers, which provides the multi-channel TDMA scheduling...
One of the challenges in Multi-Radio Multi-Channel Wireless Mesh Networks is the assignment of channels to links such that connectivity is ensured and interference is minimized. Two links that are within interference range of each other could be assigned the same channel, which causes co-channel interference and decreases network throughput. In this paper, we identify the above problem in the Topology-controlled...
The performance (such as throughput) of wireless mesh networks (WMNs) are affected by many factors such as routing protocols and interferences. To improve the throughput, several studies have proposed efficient routing protocols to find better paths and new link state metrics to accurately represent the wireless link qualities. Most of these works assume that the locations of the mesh routers are...
In this paper, we consider power control as network layer problem in wireless mesh networks. The network connectivity between nodes is determined by their communication range which in turn can be controlled by adjusting the transmit power level. It is generally acknowledged that reducing transmit power levels of nodes to the minimum required to retain connectivity always increases network capacity...
This paper investigates gateway placement problem in backbone wireless mesh networks using directional antenna systems. A heuristic gateway placement algorithm is proposed in order to minimize the total number of gateways, and the average and maximum hop count between any mesh router and its closest gateway.
Wireless Mesh network (WMN) are dynamically self-organizing and self-configured, with the nodes in the network automatically establishing an ad-hoc network and maintaining the mesh connectivity. The ability to use multiple-radios and multiple channels can be cashed to increase aggregate throughput of wireless mesh network. Thus the efficient use of available interfaces and channels becomes the key...
Wireless mesh networks are an efficient solution for Internet access provision in areas without fixed infrastructure. A centralised energy-efficient and load-aware strategy is proposed for the unified management of radio resources of multi-radio nodes, combining rate adaptation, power control, gateway rate-control and channel assignment mechanisms. An analysis of various hexagonal deployments and...
Single-radio mesh routers operating on a single channel suffer from low throughput due to collisions. Equipping mesh routers with multiple radios operating on non-overlapping channels can significantly improve the throughput. However, the assignment of channels to radios in a multi-radio mesh network is a challenging task. In this paper, we propose a channel assignment algorithm, TICA (Topology-controlled...
This paper discusses the QoS topology control problem with consideration of power control and rate adaptation in wireless mesh networks. Our task is to construct a routing forest (a set of trees rooted from the gateway nodes), configure the transmission power of each node, such that the constructed network topology can meet the delivery threshold for all nodes and the system throughput is maximized...
Wireless Mesh Networks aim to provide high-bandwidth broadband connections to a large community and thus, should be able to accommodate a large number of users accessing the Internet. Due to high estimated traffic volume in Wireless Mesh Networks, scalability and fault tolerance become important requirements in algorithm design. We propose a Failure Recovery Mechanism (FRM) for the channel assignment...
We define a utility-based framework for joint channel assignment and topology control in multi-rate multi-radio wireless mesh networks, and present a greedy algorithm for solving the corresponding optimization problem. Key features of the proposed approach are the support for different target objectives, which are expressed as utility functions of the MAC layer throughput, and the efficient utilization...
The capacity of a multi-hop wireless network is the traffic payload that it can transport. This is a prominent quality of service issue, particularly in the highly constrained settings of 802.11 wireless mesh network. In this paper, we consider two complementary definitions of the capacity. A network-wise capacity is defined as the sum of the upload traffic, and a flow- wise capacity highlighting...
Wireless mesh networks (WMNs) have emerged as low-cost alternative for broadband access networks in metropolitan area. In this paper, we revisit power control as a network layer problem in design of WMNs. Specifically, we show that increasing power levels of nodes in WMNs actually results into throughput improvements in node-to-gateway traffic pattern. It is proven that WMNs can achieve per node throughput...
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