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In this paper, we consider the problem of joint relay selection and power allocation in a cognitive radio (CR) network, where a secondary user (SU) source communicates with a secondary access point (AP) assisted by a set of SU relays. Each SU in this set not only acts as a potential relay but also has its own data transmission requirement. Keeping the interference to the primary user (PU) below a...
The existing spectrum sharing schemes in cognitive radio have difficulties on guaranteeing the quality of service of secondary system. This paper proposes a risk-estimation based spectrum leasing (RESL) scheme which applies to cellular networks in cognitive radio. In RESL, primary systems are not privileged to take back the spectrum leased unconditionally, and determine whether to lease spectrum according...
In this paper, we proposed a new approach, based on principal component analysis (PCA), to evaluate user satisfaction of packet service in GPRS network. Based on our experiment, correlations between different QoS parameters are provided. At the same time, a PCA based user satisfaction factor is defined which reflects the user experience.
In this paper, resource allocation for mixed traffic in wireless access networks is investigated and a utility-based resource dynamic allocation (URDA) algorithm is proposed. This algorithm considers the QoS characteristics, real-time resource requirements and wireless channel states that belong to different types of applications, and then generates utility functions of them. The resource is allocated...
In wireless personal area networks (WPANs), a successful design of scheduling scheme is critical for video traffic in QoS guarantee and efficient channel resource utilization. In this paper, we propose a novel cross-layer scheduling scheme for MPEG traffic in high speed WPANs. The scheme aims at introducing robust improvements to MPEG traffic scheduling by taking most advantages of traffic characteristic...
In OFDMA system, inter-cell interference (ICI) and multi-service requirement are challenging problems. Previous cell-level schemes ignored different QoS requirement of multi-service. Meanwhile, most of them only considered complex cell edge part separation but simplified cell inner part allocation to eliminate ICI, but refined inner part allocation could eliminate ICI effectively. To solve this problem,...
Mobile service will be more various and handover have to adapt different quality-of-service (QoS) requirements of all kinds of service in 4G mobile communication systems. In the paper, a dynamic priority queue handover scheme is proposed. With the scheme, a common queue manager (CQM) is appended and the priority in the queue can be changed according to the variety of waiting delay. Furthermore, the...
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