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A data gathering protocol for multi-channel wireless sensor network is proposed in this paper. The sensor field is logically divided into some finite number of grids. Each grid is managed by a potential node called as grid manager. Each grid manager is also responsible for communicating aggregated data generated inside the respective grid to the base station either directly or via multi-hop communication...
We propose a novel algorithm for channel assignment in wireless body area networks. The proposed approach is based on the machine learning sub-domain known as reinforcement learning, and is named reinforcement learning — channel assignment algorithm (RL — CAA). RL — CAA interacts with the environment in an unsupervised way and selects the optimal frequency channel for the wireless sensor nodes. RL-CAA...
In this paper, we exploit the capture-effect for channel allocation. We experimentally show the characteristics of capture-effect across different channels, over time, and in different network densities. Then, we introduce CACA, an effective channel assignment protocol for wireless sensor networks. Traditional channel assignment protocols utilize all available channels to minimize interferences between...
Multi-channel MAC protocols gains very much importance because of the necessity to enhance the network capacity of wireless networks. Existing MAC protocols rarely exploit the non-interfering multiple channels of 802.11 standard. This paper evaluates a channel allocation method which improves the overall throughput of 802.11 MAC. This method reduces collision considerably, by allowing each node to...
Channel allocation and Channel access are considered to be the most important issues in Wireless Communication System. MAC protocols for wireless sensor networks based on CSMA/CA induce high overhead due to RTS/CTS packets and does not completely eliminate hidden terminal problems. A new technique, called Grid based Channel allocation and Access scheduling using Latin Squares (GAALS) can be effectively...
One of the crucial challenges experienced by Wireless Sensor Networks (WSNs) is the increasing number of devices sharing the limited spectrum of the ISM band. As a result, a new concept of Cognitive Wireless Sensor Networks (CWSNs) has been proposed in order to achieve reliable and efficient communication via spectrum awareness and intelligent adaption. Based on such concept, this paper proposes novel...
With the development of computer and wireless technology, cost and size of the wireless transceiver has decreased greatly. It is feasible and necessary to equip multiple radios on sensor nodes, especially on the backbone nodes having high demand on performance. The author proposed a MR-MC (Multi-radio and Multi-channel) manufacturing sensor network based on the nested cellular topology in previous...
In this paper, novel operating and backup channels allocation schemes for IEEE 802.22 system are introduced and their performances are investigated. Interference level and the probability of appearance for incumbent user are taken into account in order to optimally update the backup channels list. Additionally, the operating channel is allocated based on Carrier to Interference and Noise Ratio (CINR)...
In this contribution, we will reveal some problems related to the transition of the maxmin fairness concept from the continuous to the discrete domain. By means of the wireless channel allocation problem, a heuristic approach to fairness allocation will be presented, based on searching for allocations with high similarity of the corresponding throughputs and high total throughput at the same time...
Spread spectrum multiple-access packetized wireless communications systems are considered. Although very efficient in low traffic (or low-rate) and low signal-to-noise ratio scenarios, the traditional and well-known spread ALOHA multiple access (SAMA) quickly collapses when both traffic and signal power increase. In certain situations, such as wireless sensor network traffic towards a sink, this severely...
One of the major concerns in wireless sensor networks (WSNs) is improving the network lifetime. This paper addresses the problem of energy saving in an IEEE 802.15.4a large-scale full mesh WSNs based on UWB technology. It presents a network architecture to facilitate resource sharing and to ensure load and energy balancing. With a particular focus on medium access control (MAC) protocols, we propose...
A bandwidth allocation algorithm based on multi- coalition game (BAMCG) is proposed to address the problem of bandwidth competition in wireless sensor networks. Through establishing utility function of node and coalition, a coalition with multiple nodes which are in the same communication range is formed to increase network utility, the bandwidth assigned to nodes within the coalition is implemented...
In this paper, on the base of comprehensive consideration of game theory and the IEEE 802.11 DCF Distributed Coordination Function, for the characteristics of the wireless sensor network, we make the channel competitive process between nodes molded into incompletely information dynamic game. Then improve DCF by the Nash equilibrium game strategy. The simulation results show that the proposed model...
Empirical results from a performance study of an Integrated Wireless Sensor Network (WSN) and Wireless Local Area Network (WLAN) are presented in this paper. Integration of heterogeneous wireless technologies using different modulation techniques such as direct-sequence spread spectrum (DSSS) and orthogonal frequency division multiplexing (OFDM) require careful deployment planning and configuration...
In this work, a Multi Channel Medium Access Control (MAC) has been implemented in PICSENSE wireless sensor network hardware platform. A measurement based dynamic channel allocation has been proposed in a dedicated control channel based multi channel medium access control protocol. The implementation has been done with three channels, a control channel and two data channels. Throughput and latency...
In this paper, we study the trade-off between network throughput and fairness in a multi-channel enabled wireless sensor network (WSN). Traditional approaches attempt to solve the two problems in an isolated manner without a joint design. Our empirical studies show that solutions to these two problems cannot be simply combined. Away from the traditional belief, the number of channels in WSNs with...
The QoS requests of data traffic with lower priority in hotspot areas are not always satisfied in a traditional cellular wireless communication system. But on the other hand, about 60% of the channel slots allocated to a voice user is wasted due to the spurt of speech packets. In this paper, a cooperative strategy for transmitting data packets and speech spurt packets over the shared channel of voice...
An important problem in multi-radio multi-channel wireless mesh networks is how to perform efficient network-wide broadcasting. While route discovery or energy efficiency is the major concern for broadcasting in mobile ad-hoc networks or sensor networks, in WMNs, more attention should be paid to the high-throughput schemes. In this paper, we propose an interference-aware broadcast routing and channel...
The wireless mesh networks (WMNs) are statically deployed on heterogeneous areas and are operating in open wireless media, and thus it coexists with other networks operating on the same frequency with the same or different radio access technology (RAT). The WMNs experience two types of interferences according to the source of interference. Coexisted networks with WMN induce the interference called...
A prioritized medium access control (PMAC) protocol is proposed for wireless sensor networks, based on a binary count down approach. PMAC effectively eliminates data collision and optimizes channel allocation. Moreover, as many networks nowadays compose traffic with several priorities, the simple yet effective design of PMAC offers strict service differentiation for prioritized packets. In this paper,...
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