The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a time division multiple access MAC protocol that is specifically designed for applications requiring periodic sensing of the sensor field. Numerical analysis is conducted to investigate the optimum transmission scheduling based on the signal to interference-noise-ratio (SINR) for ground level propagation model applied on wireless chain topology. The optimised transmission schedule...
Topology control is one of the key technologies in ad hoc network. Recently some topology control algorithms focus on reducing the end-to-end delay have been proposed. However, they do not consider the delay which is caused by contending for the shared channel and collision at MAC layer. In this paper, we put forward a new delay model to character the link delay which is composed by the transmission...
Inter-cell Interference can be seen as a huge challenge towards meeting the high capacity and coverage targets, as envisioned in 5G era. To this end, factors like the expected high density of access nodes reusing the same spectrum, the diverse sources of interference from heterogeneous access technologies, flexible wireless backhauling and the consideration of multiple 5G services with different KPIs...
Spectrum databases are increasingly being used, particularly in spectrum sharing mechanisms, but also in realms such as network optimization, novel licensing regimes, and regulatory monitoring, among others. Spectrum databases are often far more effective, reactive, or sometimes even are required to operate, in conjunction with spectrum sensing — especially if their operation requires automation....
Two-tiered direct network topologies such as Dragonflies have been proposed for future post-petascale and exascale machines, since they provide a high-radix, low-diameter, fast interconnection network. Such topologies call for redesigningMPI collective communication algorithms in order to attain the best performance. Yet as increasingly more applications share a machine, it is not clear how these...
Network virtualization has been proposed to be a promising way to solve the Internet ossification problem. One of the main challenges for network virtualization is the virtual network embedding (VNE) problem, which focuses on the efficiency of the substrate resources allocation and involves the virtual node and link mapping problems. Node mapping process has serious influence on the whole mapping...
Some characteristics of optical networks can be assessed by analyzing the topology of the network. Many metrics can be used for this purpose. Modularity indicators were already proposed to study complex networks, and they have been useful to clarify many real world problems. In this paper, we propose an indicator inspired in the traditional modularity concept aiming at finding suitable routes in optical...
Cognitive radio network (CRN) is proposed to solve the problem of the scarce radio spectrum resources. In CRN, primary users (PUs) are allowed to lease out their unused spectrum sharing with cognitive users (CUs). In this paper, we propose a parallel spectrum allocation algorithm based on CUs bandwidth requirement, and the spectrum allocation time is also taken into account. Our objective is to optimize...
The Advanced Metering Infrastructure (AMI) is a key component of the Smart Grid architecture. The Neighborhood Area Network (NAN) is the portion of the AMI that enables two-way communication between electric, gas and water meters and City Utilities. Many companies are currently deploying wireless NAN architectures based on the IEEE 802.15.4g technology while the Routing Protocol for Low-Power and...
This paper proposes a new decentralised multi-channel tree building protocol with a centralised controller for the Internet of Things. The protocol alleviates the effect of interference which results in improved network efficiency and stability, and link reliability. The proposal takes into account all available channels to utilise the spectrum and aims to use the spectrum efficiently by transmitting...
A static channel assignment algorithm in multi-radio multi-channel WMN (Wireless Mesh Network) is proposed aiming to minimize the maximum link interference. The proposed algorithm is an approximation algorithm since the problem is NP-hard. We prove that the greedy channel assignment algorithm is a factor (2−1/k) algorithm, where k is the number of available orthogonal channels. Additionally, the greedy...
Most research works of interference alignment (IA) focus on the symmetric networks. When the difference of path loss is considered in asymmetric networks, topology management (TM) needs to be carefully designed for IA-based interference networks, through separating the network into an IA subnetwork and some spatial multiplexing (SM) subnetworks. Nevertheless, the resource allocation problem has been...
The abundance of unlicensed frequency resources in the mm-Wave frequency range, especially round 60 GHz bands, have a great potential to fulfill the increasing demands of high speed wireless applications. In mm-Wave wireless communication systems, directional transmission technologies become an inherent feature to compensate the high pathloss. The frame aggregation scheme is designed to maximize network...
Topology construction is a vital technique in cognitive radio ad hoc networks. In this paper, considering the nodes residual energy, available channel quality and the interference of primary users, a topology model based on BBV (Barrat, Barthelemy and Vespignani) model and the triad formation mechanism is proposed, which ensure the network topology with both scale-free and small- world features. The...
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...
The stability of links in mobile cognitive networks (MCNets) is significantly affected by primary user activities and node mobility, which makes topology control and stable routing more challenging than that in traditional wireless networks. In multi-channel multi-hop MCNets, it will become worse. In this paper, we propose a primary user activity prediction model to reveal channel utilization patterns...
Interference elimination is a key aspect of planning and operating wireless networks. Using frequency duplex links is a common practice, where the communication is done via two channels separated in frequency. An optimization problem is how to allocate the channels in the frequency duplex in order to reduce or completely eliminate the interference might occur between links. In a previous paper we...
This paper presents a controlling approach to improve throughput using cross layer integration. Now a days communication networks require minimal interference and maximum accuracy with a faster data rate. Throughput improvement has become a vital issue in deploying broadband wireless sensor networks. Based on integration of optimum power allocation and memory blockage a novel approach of cross layer...
The most demanding tenants of shared clouds require complete isolation from their neighbors, in order to guarantee that their application performance is not affected by other tenants. Unfortunately, while shared clouds can offer an option whereby tenants obtain dedicated servers, they do not offer any network provisioning service, which would shield these tenants from network interference. In this...
Ever going need of data rate and coverage can be achieved by mitigating the impairment of wireless communication system. Interference is most challenging impairment of wireless. Multi cell cooperation (MCC) is one the technique to mitigate the inter cell interference. In this paper, stochastic geometry approach is used to analyse cooperation between MCC. The locations of Base Stations (BSs) follow...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.