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As a kind of effective way to improve the utilization ratio of the spectrum, more and more attention have been paid to the cognitive radio. This paper proposes an improved cognitive radio spectrum sharing model. In this model, the primary users provide idle spectrum to the secondary users. Secondary users have to pay when they share available spectrum with primary users while using the spectrum. The...
We consider the problem of cross-layer resource allocation in time-varying cellular wireless networks, and incorporate information theoretic secrecy as a Quality of Service constraint. Specifically, each node in the network injects two types of traffic, private and open, at rates chosen in order to maximize a global utility function, subject to network stability and secrecy constraints. The secrecy...
The growing problem of spectrum scarcity and the inefficient spectrum utilization in the licensed bands, are addressed by the emerging Cognitive Radio (CR) paradigm. It is seen that the choice of the spectrum bands, called as spectrum decision, must be organized carefully by considering the challenges in the spectrum availability over time, the short term fluctuations in the availability, and the...
In this paper we validate through simulations the convergence properties of our earlier proposed balls and bins channel allocation algorithm. The algorithm supports dynamic channel allocation based on local link quality information and does not require exchange of network information. Each radio evaluates periodically a cost function related to the desired QoS. Based on the calculated cost the radio...
Routing algorithm mainly focuses on routing method to ensure the connection between the sender and the receiver during each session is optimal and effective. It is very useful in packet transmission, especially in meeting the quality of service. Some traditional shortest path search algorithm (Width preferred search algorithm, Dijkstra algorithm) can solve the shortest path problem well within polynomial...
Fairness is an important component in scheming resource allocation. It can fairly allocate the resources to all users. In this paper, we study and investigate fairness of resource allocation for downlink OFDMA in radio resource management system. The data rate is arranged among the users in order to schedule the best channel for achieving fairness of resource allocation. We use sub-carrier allocation...
Energy efficient multicast routing has been a blooming research field in wireless networks. However, this kind of multicast routing only addresses the transmission radius coverage might not be able to meet the bandwidth requirement of the users. In this paper, for the first time, we address the bandwidth aware minimum power multicast routing problem in wireless networks. We first formulate this problem...
To control wireless network congestion, an adaptive QoS and wireless bandwidth (adaptive-QWB) was designed in this paper. The adaptive-QWB algorithm seeks an active queue management for the optimal target queue according to the dynamic varying rate of current bandwidth. The experiment results show that the varying-time of adaptive wireless bandwidth and the QoS guaranteed in transmission delay with...
QoS routing problem in wireless mesh networks is a NP-complete problem, and it is hard to get the global solution with the traditional algorithm. In this paper, we adopt a novel dynamic ant genetic hybrid algorithm to solve QoS unicast routing problem for wireless mesh network, whose innovation are using the best melting point evaluation strategy to control the calling of the two algorithms dynamically...
In this paper, we concentrated on resource allocation for heterogeneous traffic in OFDM wireless networks. We considered three types of traffic, i.e. hard QoS, soft QoS and best effort (BE), the characteristics of which can be described by three different utility functions. We proposed a utility-based cross-layer resource scheduling model, which performs combinational-optimization adaptive resources...
We propose a traffic engineering (TE) architecture to supply wireless mesh networks (WMNs) with an efficient support of diverse applications with different quality of service (QoS) requirements. The proposed TE-WMN architecture is based on the MPLS technology. Its main goal is to provide TE capabilities so that a heterogeneous infrastructure, made of wired networks and WMNs, can be built and managed...
With the emergence of high bandwidth-delay product and heterogeneous wired / wireless networks, the standard TCP appears to be too conservative to offer reasonable performance. The use of parallel TCP connections has been suggested in such environments. We have demonstrated that, with the same level of aggressiveness, this approach can outperform the single-connection based approach. However, this...
In this paper, we propose the EDCA-TM, a new architecture which tunes the enhanced distributed channel access (EDCA) for multi-hop networks. In EDCA-TM, we suggest a new module for dynamic access category adaptation (DACA) over the existing channel access mechanism such as EDCA. It processes received data packets for assigning an appropriate access categories (AC) to provide delay and rate guarantee...
In this paper we consider multi-hop wireless mesh networks intended to provide Internet connectivity to both end users and hotspots. In such networks mechanisms for provisioning QoS for delay sensitive flows arise as an important topic. In this context, we focus on the non-bifurcated (single path) routing of such flows as a means of allowing all packets in any flow to receive uniformly controlled...
A scheduling mechanism of differentiated services based on priority is presented in this paper, which is used to resolve a problem of resource assigned fairly in circumstance of wireless multi-services. This scheduling mechanism contrasts with other multi-services scheduling algorithms in performance by simulation. The simulation results indicate that the scheduling mechanism can provide QoS guarantee...
The traffic in the high-speed wireless multimedia network will be a mixture of voice, video and data messages having a large variety of characteristic and inherent requirement. The present work is a medium access control protocol for time division-code division multiple access system to distribute the available bandwidth among the mixture of different traffic classes depending upon their quality of...
Today, we are in a world where several radio networks arise: we speak about mobile networks, wireless networks (IEEE 802.11, .15, .16, .20, .21...), networks of sensors, radio-frequency identification networks (RFID) and more generally networks of ldquoThings connected via radio interfacerdquo. In this heterogeneous environment, a user with a multi-interface terminal can have access to the networks...
We present improved SNR-based packet scheduling (I-SPS) algorithm as an extension of SPS algorithm. In I-SPS, the connection with better channel condition will be assigned higher weight in scheduling and the connection suffered burst error will be compensated by increasing its weight after its channel condition becomes good. Theoretical analysis and simulation results demonstrate that I-SPS algorithm...
IEEE 802.16 and Passive Optical Network (PON) are two promising broadband access technologies for high-capacity wireless and wired access networks, respectively. In order to better understand the co-existence of both network technologies and to determine whether closer cooperation in the bandwidth provisioning process is advantageous, an access network that utilizes a Gigabit PON (GPON) to backhaul...
Current mobile terminals are often equipped with several network interfaces, which may be of different access technologies, both wireless and cellular. It is possible to select dynamically the best interface according to different attributes such as the interface characteristics, user preferences and/or application preferences, ... MADM is an algorithmic approach suitable to realize a dynamic interface...
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