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In this paper, we consider a collaborative routing strategy in cognitive radio network. We define a system model and a pricing scheme as a means to stimulate cooperation in users. Assuming that cognitive radio base station sets prices for the network profit maximization according to the interferences caused by secondary users to primary users, we propose an iterative price adaptation algorithm to...
In the distributed Cognitive Radio Networks, routing should consider how to dynamically select frequency band for either per flow throughput guarantee or global spectrum utilization. Since different second users may sense different spectrum availability, efficiently sharing this information in the dynamic spectrum environment still remains challenging, however, collaborative route and spectrum selection...
Since mobility may cause radio links to break frequently, one pivotal issue for routing in mobile ad hoc networks is how to select a reliable path that can last longer. Several metrics have been proposed in previous literatures, including link persistence, link duration, link availability, link residual time, and their path equivalents. In this paper, we present a novel algorithm for predicting continuous...
In this paper, a TDMA-based protocol for exchanging spectrum data information and forming cluster structure is proposed in hierarchical spectrum sharing network (HSSN), by which spectrum information such as spectrum identification and classification are exchanged and local control channel is established. Moreover, an easy-to-implement multi-channel access-based clustering protocol is also proposed,...
In this paper, based on distributed Cognitive Radio Networks, we have investigated the problem of intermittent connectivity in routing for either per link propagation time guarantee or global spectrum utilization, after efficiently analyzing broadcast TV system channel-usage model, we develop a novel collaborative strategy for spectrum and route selection. The main protocol mechanisms include routing...
This paper firstly analyzes the impact which clustering and non-clustering structure is on sensing spectrum expenditure. Furthermore, the reason that clustering structure is adopted in hierarchical spectrum sharing network is also illustrated by numerical simulation. Secondly, a clustering algorithm, which can reduce detection expenditure, is proposed based on the similarity of the spectrum in such...
Network service support to ensure quality of service (QoS) is a key requirement for many advanced grid applications, such as collaborative working or remote visualization which require more stringent traffic guarantees. In this paper, we present a novel QoS oriented service architecture which provides network resource scheduling service in large-scale network environment based on the service level...
In this paper, we propose a Policy-based Application-aware Network QoS Management architecture, by extending the IETF Policy-Based Management framework with a QoS feedback mechanism and an additional application information model to support application-aware adaptability, thus achieves flexibility and automation of QoS management for large-scale networks.
A novel approach for 3D head transformation based on Gaussian transform provides automatic metamorphosis for 3D heads. It eliminates human intervention for feature specification by facial marking. In addition, this method makes it possible to transform 3D figures based on only one center and a few parameters. The results of experiments indicate that this algorithm needs less control by users and is...
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