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In today's cellular networks, it becomes harder to provide the resources for the increasing and fluctuating traffic demand exactly in the place and at the time where and when they are needed. Moreover, a cellular network which can cover indoor areas and hot-spots is a complicated and expensive task. Therefore, a new hierarchical topology is put forward to solve the problem, and the topology have application...
Since network coding is very useful for increasing the total throughput in wireless networks, it has recently gained much attention. However, there is few works focusing on network coding in the cyclic topology network, in which six nodes are connected to form a cluster. Considering the case that each node's regional information is required to be exchanged among all the nodes in the cyclic network,...
The low cost and ease of installation of Wi-Fi equipment operating in unlicensed spectrum have made dense Wi-Fi deployments a reality in most modern urban areas. With the lack of many non-overlapping frequencies to operate on, interference among neighbor Wi-Fi cells can cause significant performance degradation. Here we study the problem of topology discovery in such dense deployments, which is necessary...
The aggregate capacity of wireless mesh networks is severely affected by interflow interference. Directional antennas and multiple channels are two well known techniques which can be applied to mitigate interflow interference. In this work, a network architecture is proposed to incorporate directional antennas with multiple orthogonal channels effectively to enhance the performance of wireless mesh...
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...
We will propose an adaptive distributed power management (DISPOW) algorithm that adaptively preserves network connectivity and cooperatively reduces interference for the dynamic environment and the changing network topology thereby improving the network performance. The proposed algorithm distributively builds a unique stable network topology tailored to its surrounding node density and propagation...
In multi-hop wireless networks, the way the network topology is defined has a strong impact on routing. This paper deals with topology control in cellular networks with relays. Several topology control algorithms taken from ad-hoc networks are adapted to cellular networks. Most of the algorithms considered here are based on proximity graphs. Performance analysis is carried out in a realistic scenario...
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...
This paper presents the results of an independent evaluation of four different commercial wireless mesh network systems using IEEE 802.11 radios in the context of small-scale, rapid deployment scenarios in public safety and emergency applications. To ensure repeatability and fairness in our evaluation, we designed and built a conducted wireless evaluation platform which provides a controlled test...
Performance of a deployed Wireless Sensor Network (WSN) is greatly influenced by the interference it is subject to during operation. Degradation happens due to interference resulting in packet drops, retransmissions, link instability and inconsistent protocol behavior. We have conducted experiments that highlight the fact that interference caused by WiFi and co-channel contention significantly degrades...
Topology Control (TC) algorithms are generally applied to tactical network environments to create or maintain connectivity graphs with specific topological properties. In the context of this work, network topology defines the connectivity and link properties between nodes in the network. While protocols in the communications stack are traditionally designed to adapt to different traffic demands and...
The realm of ad-hoc and sensor networks has been a deeply studied area in recent years: many protocols, simulations, theories, etc. emerged. There is however a gap between the simulated results and the real world implementations, due to mainly two reasons: electromagnetic signal propagation and antenna models. The first of the reasons (propagation) started picking up attention, however antenna studies...
Mobile adhoc networks (MANETs) provide a means of communication when infrastructure is not available. Due to the interference caused through the sharing of a common frequency the capacity of such networks decreases as the number of users increase. This paper investigates how the insertion of additional nodes at strategic points coupled with control of nodes' transmission powers can decrease the interference...
We propose a link quality assured topology control algorithm for sensor network in this paper, which is based on the received signal strength indicator (RSSI). We take the uncertainty of wireless links into algorithm design consideration by adopting the quasi-UDG wireless communication model. LQATC can guarantee the network connectivity, link symmetry, and reasonable degree of nodes. Furthermore,...
In this paper, we have summarized our analysis about distributed antennas based CoMP in LTE-Advanced and evaluated the system spectrum efficiency in three scenarios. From the results, we can see the proposed scheme achieves a higher throughput compared with centralized antennas based system. The location of antennas closed to sector center leads to the optimal system performance. With the change in...
The density of IEEE 802.11 Wireless Local Area Networks, especially in metropolitan areas, has resulted in almost ubiquitous wireless presence in such environments. Apart from the benefits of increased wireless coverage, though, uncontrolled WLAN deployment has brought to attention interference issues among neighbor wireless networks. Combating interference has become one of the keys to successful...
The capacity of wireless mesh networks can be enhanced with judicious channel assignment. This paper deals with one particular type of mesh network topology - the tree topology. The unique characteristics of this topology is that all the traffic to/from the mesh nodes goes through the root. This enables design of an efficient channel allocation algorithm that utilizes the intrinsic characteristics...
In this paper, we present a feasible communication concept within the field of ambient networks and cognitive radios. The approach deals with the integration of different radio modules into an embedded communication platform. Basic idea is the simultaneous coexistence of multiple independent network interfaces, which allows us to combine the advantages of different communication technologies. At the...
Wireless Mesh Networking (WMN) is an emerging communication paradigm to enable resilient, cost-efficient and reliable services for the future-generation wireless networks. We study the minimum-latency communication primitive of gossiping (all-to-all communication) in known topology WMNs under physical interference model, i.e., where the schedule of transmissions is pre-computed in advance based on...
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