On providing fairness, QoS support and spectral efficiency in OFDMA/TDD environments

Modern wireless networks, such as WiMAX or LTE are using OFDM/OFDMA as the enabling technologies for broadband transmission in cellular environments with QoS capabilities. In these networks, such schema as radio resource management, admission control, scheduling are essential. In this article we firstly introduce a Time-Frequency Burst Mapping algorithm for radio resource management that improves the spectral efficiency of OFDMA/TDD channel. A Frame-based Weighted Fair Queueing (F-WFQ) Algorithm, which is a modified version of the conventional WFQ and suitable for operations in OFDMA/TDD environments is also proposed. When combining the two algorithms, we point out that the spectral efficiency can be maintained, while fairness, delay and proportional throughput of backlog sessions are greatly improved in comparison to the conventional Proportional Fair scheduling algorithm.