IEEE Transactions on Mobile Computing
IEEE Transactions on Computers
WiMAX: Standards and Security
Scheduling in IEEE 802.16e Mobile WiMAX networks: key issues and a survey
IEEE Journal on Selected Areas in Communications - Special issue on broadband access networks: Architectures and protocols
IEEE Journal on Selected Areas in Communications - Special issue on broadband access networks: Architectures and protocols
Downlink scheduling and resource allocation for OFDM systems
IEEE Transactions on Wireless Communications
Overview of measurement-based connection admission control methods in ATM networks
IEEE Communications Surveys & Tutorials
IEEE Wireless Communications
Cross-layer optimization for OFDM wireless networks-part I: theoretical framework
IEEE Transactions on Wireless Communications
Cross-layer optimization for OFDM wireless networks-part II: algorithm development
IEEE Transactions on Wireless Communications
Call admission control schemes: a review
IEEE Communications Magazine
Hi-index | 0.00 |
According to the AMC (Adaptive Modulation-Coding) mechanism of the M(obile)-WiMAX, the amount of data per modulation symbol depends on the perceived Signal-to-Noise Ratio, while, based on the OFDMA (Orthogonal Frequency Division Multiple Access) technique, each communication entails multiple concurrent transmissions. Therefore, in the uplink case, where each terminal has a maximum power limitation, the assignment of additional subcarriers does not always correspond to a proportional datarate increment, since the power dispersion over a larger set of symbols can cause the transition to a lower AMC level. In this framework, the present paper introduces a novel RRM (Radio Resource Management) algorithm that dynamically alters the number of subcarriers to be allocated to each connection so as to achieve spectrum saving via augmenting the bits per symbol ratio. Furthermore, in order to mitigate the extensive fluctuations imposed by the novel RRM scheme, an adequate minimum-complexity CAC (Connection Admission Control) scheme is proposed, which succeeds in accurately estimating the bandwidth requirements of the active flows by incorporating theoretical calculations along with a sampling process. It is proven analytically as well as through simulations that the new combined RRM-CAC strategy increases substantially the system capacity, without violating the Quality-of-Service guarantees.