Radio resource management with cross-layer designs in broadband wireless access networks
Διαχείριση κατανομής πόρων με διαστρωματική σχεδίαση σε ασύρματα ευρυζωνικά δίκτυα
This dissertation is addressed to novel and high innovative technical solutions for broadband wireless access (BWA) networks. The proposed networks are compatible with the existing IEEE 802.11n wireless local area networks (WLANs), wireless metropolitan area networks (MANs) IEEE 802.16e and WiMAX systems(Worldwide Interoperability for Microwave Access). The proposed designs are linked to the specific requirements which will be incorporated into emerging IEEE 802.16m and LTE advanced (Long Term Evolution) standards. These standards aim at defining an air interface that can ensure high mobility, transmit high data rates and offer higher performance compared to the current standards. The dissertation focuses on advanced radio resource allocation schemes involving cross-layer optimization and hopes to influence these future standards. Radio Resource Management (RRM) algorithms optimize the radio resources especially spectral efficiency and reduce the power consumptions. This work studies mechanisms for downlink (DL) RRM in an environment which suffers from interference created by neighboring transmitters. Beamforming, scheduling and admission control are evaluated. After the description of state-of the-art techniques, advanced algorithms - strategies are developed and simulated. These algorithms take information coming from the radio site (RSSI, CSI, SNR, etc) or from the application layer side (QoS).