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Radio spectrum is a valuable and scarce natural resource and the introduction of spectrum trading can optimize the use and improve the efficiency of this scarce resource. This paper gives a brief analysis of incentives to spectrum trading from both macro and micro perspectives, in which it focuses on the relationship between initial spectrum assignment processes and secondary spectrum trading. Furthermore,...
Resource allocation is a critical issue for Wireless Sensor Networks (WSNs) especially for Ultra-Wide Band (UWB) based networks. In this paper, we present frequency allocation scheme for an efficient spectrum management that is able to statically assign control channels and dynamically reuse data channels for Personal Area Networks (PANs) inside a Large-Scale WSN based on UWB technology. The frequency...
In P2P networks, it is effective to allocate replicas of each data item to multiple peers for improving search efficiency and data availability. It has been mathematically proved that the square-root allocation, in which the ratios of numbers of replicas are proportional to the square-root of their access frequencies, is optimal in terms of search efficiency. In this paper, we propose a replica relocation...
A major challenge of the future heterogeneous wireless network is the Radio Resource Management (RRM) strategy. The concept of Common RRM (CRRM) has been proposed to jointly manage radio resources among different Radio Access Technologies (RATs) in an optimized way. In order to evaluate the performance of different CRRM algorithms, a simulation model needs to be developed. This paper proposes a system...
Cognitive radio technology has arisen as a hot topic in wireless communication in recent years. Special spectrum allocation algorithms are essential to adapt to the time-space varying characteristics of wireless spectrum in cognitive networks. In this paper, we study and simulate the guard channel policy proposed by Huang Zhen, etc. We find that the blocking probability of secondary users is relatively...
We study the problem of designing a new trading market for dynamic spectrum sharing when there are multiple sellers and multiple buyers. First, we study the interaction among homogeneous buyers of spectrum as a noncooperative game and show the existence of a symmetric mixed-strategy Nash equilibrium (SMSNE). Second, we assume that the sellers employ an optimal mechanism, called the generalized Branco's...
There are more and more studies in focus on mobile ad hoc networks (MANETs). Because of the advantage of it can be constructed only by mobile hosts which work like routers. Even if no infrastructure, communication still can be proceeded. It is applicable in the urgent rescue, military battlefield and other situations that must temporarily construct the network. In MANET, mobile hosts (MHs) will store...
DSA (dynamic spectrum allocation) techniques are very challenging when the quality of service has to be guaranteed in a flexible spectrum situation. In this paper, we present and analyze DSA policies for packet services in cellular context. A centralized model, where a meta-operator shares a common spectrum among different operators, is considered. We focus on two criteria for the policies design:...
Rapid growth in the consumer base for mobile services against the backdrop of limited spectrum demands intelligent networks for optimum utilization of the allocated spectrum with minimal changes in the existing infrastructure. This paper introduces a novel three stage predictive channel allocation scheme called Intelligent Channel Allocation (ICA) based on long term call statistics, instantaneous...
We consider dynamic spectrum allocation in the downlink between multiple service providers and users, and develop a model that is applicable for many future scenarios. The service providers set prices for spectrum and transmit data to users, who purchase their spectrum. Each provider transmits at a specific power spectral density which is an indicator of the efficiency of the modulation and coding...
We examine the problem of designing an auction mechanism for dynamic spectrum sharing when there are multiple sellers and multiple buyers. First, we study the interaction among homogeneous buyers of spectrum as a noncooperative game and show the existence of a symmetric mixed-strategy Nash equilibrium (SMSNE). Second, we prove that there exists an incentive for risk neutral sellers of the spectrum...
This paper employs simulation methods to evaluate the ability of three different auction mechanisms to determine an efficient license regime for radio spectrum as well as the efficient ownership of the associated rights. The two regimes explored are ldquolicensedrdquo spectrum, in which a winning bidder maintains exclusive rights to use the spectrum, subject only to technical restrictions, and ldquonon-licensedrdquo...
Cognitive radio is an emerging technique to improve the utilization of radio frequency spectrum in wireless communication networks. In this paper, we consider the problem of spectrum sharing among a few primary users and multiple secondary users through auction games. With the second-price auction and VCG auction, we adopt a utility function to obtain the optimal total payoffs the secondary users...
The clock-proxy auction is a combinatorial auction which is specially designed for environments where bidders have complex preference structures (complements and substitute items), as also occurs in the spectrum licenses market. In such an intricate context, it is difficult to find an optimal strategy. Nevertheless, if a particular environment is selected, evolutionary computation techniques can be...
In this paper, we solve for the optimal spectrum management of the sum-rate maximization problem in two-user symmetric interference channels. A sum-power constraint, or equivalently, equal power constraints are assumed. First, by solving a closed form equation, we explicitly obtain the optimal spectrum management in flat channels as an optimal combination of flat FDMA and flat frequency sharing, exploiting...
Two main problems in wireless communications are (1) limited available spectrum and (2) inefficiency in the spectrum allocation policy. These problems lead to the blocking of both initial and hand-off calls. We propose a spectrum allocation scheme in two phases. In the first phase, a collision between two calls for spectral band allocation is resolved. In second phase, spectral band allocation among...
We consider the power control problem of maximizing the sum rate of a symmetric network of interfering links in Gaussian noise. We consider a static network: there is no time-varying fading and the power allocation is also mandated to be time and frequency flat. All transmitters have a maximum allowable average transmit power, the same for all transmitters. We solve this nonconvex problem by identifying...
As the heterogeneity of wireless access technologies increases dynamic allocation and utilisation of spectrum become ever more important. The traditional rigid allocation of spectrum based on technology specific usage does not appear to be suitable for the increasingly dynamic demand driven by the continuous emergence of technologies providing new services with different bandwidth and quality of service...
IEEE P1900.4 is an emerging standard for optimized radio resource utilization where cognitive radio technologies are used for efficient spectrum utilization. In this paper, we design and implement a cognitive wireless network system based on open documents of IEEE P1900.4, and evaluate its performance using UDP streaming and HTTP download. Our experiments show interesting results that total network...
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