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Research about multimedia streaming in cognitive radio network has become a hot issue recently. In order to enhance the throughput of real-time multimedia streaming and maximize the utility, we proposes a dynamic spectrum allocation strategy based on Qos-layering and auction theory (QLAS). In this strategy, we classify the secondary users according to the feature of data stream, and choose the optimal...
In this paper we study quality-of-service (QoS) provisioning in an ad hoc cognitive radio network with spectrum underlay. Both streaming traffic and non-real-time (nrt) data traffic are considered. An admission control scheme is first proposed based on relatively static information such as path loss and average interference levels in order to guarantee the average throughput of each connection. Outage...
In this paper we introduce a new architecture for dynamic spectrum sharing called the distributed dynamic spectrum leasing (D-DSL) and a game theoretic framework for its implementation on a cognitive radio network. In D-DSL, it is assumed that each channel is assigned to a primary user who may lease the channel to secondary users. The spectrum owners can thus dynamically adjust the amount of interference...
In this paper, a novel power control algorithm for cognitive radio networks is proposed based on game theory. Taking power expenditure, quality of service (QoS) of both primary users (PUs) and cognitive second users (SUs) into account, we can model the power control problem as a multi-objective optimization problem. To solve this problem, a convex cost function is first constructed in terms of transmit...
We propose a novel algorithm to model the dynamic channel allocation problem in cognitive radio networks. In the proposed work, we define a unique model to assign priorities to the secondary users based on the required Quality of Service and on the interference delay to minimize the switching of secondary users. The proposed scheme also mitigates the delay of the licensed primary users due to minimized...
A cognitive radio (CR) network is a secondary network operating in the frequency band and geographical area of a primary network to which the spectrum is licensed. In this paper, we consider a primary broadcasting network consisting of a transmitter and a number of primary users (PUs). The secondary users (SUs) make opportunistic unlicensed spectrum access to communicate with their base station (BS)...
Cognitive radio has been considered as a promising paradigm to achieve efficient spectrum usage by allowing the coexistence of the primary and secondary networks. One fundamental challenge is to ensure the quality of service (QoS) of the primary link while maximizing the transmission rate of the secondary links. In this paper, we investigate cooperation based spectrum access at the secondary networks...
Cognitive radio network has received increasing attention in recent few years. Cognitive radio network is viewed as a novel network for improving the utilization of a precious natural resource: the radio electromagnetic spectrum. This paper first gives a general overview of the background and concept of cognitive radio network. Then we focus on the routing algorithm based on the QoS requirement. In...
We propose a novel graph theoretic matching algorithm to model the dynamic channel allocation problem in cognitive radio networks. In the past, no research work has considered both the channels and the user request priorities in the context of spectrum allocation. In our work, we define a unique model to assign priorities among the channels in a spectrum based on the transmission power allowed in...
We investigate the dynamic spectrum sharing problem among primary and secondary users in a cognitive radio network subject to QoS constraints for secondary users and interference constraints for primary users. For a scenario where only mean channel gains from secondary users to primary receiving points, which are averaged over short-term fading, are available, we derive outage probabilities for secondary...
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