A generic real-time traffic scheduler for OFDMA based cellular networks

In this work, we propose a real-time traffic scheduler framework that is generalized to handle both voice and video in the downlink of Orthogonal Frequency Division Multiple Access (OFDMA) based cellular networks like 3GPP Long Term Evolution (LTE). These networks are packet switched in nature. As a result, Packet Scheduling (PS) and Radio Resource Allocation (RRA) algorithms at the Base Station (BS) play an important role in achieving high capacity. The paper, thus, proposes a new RRA algorithm which combines time domain PS and frequency domain RRA, thereby increasing the system capacity of both VoIP and video users. The algorithm is also seen to improve the percentage user satisfaction while keeping the radio resource utilization nearly unchanged. Its performance is analyzed using LTE system parameters and evaluated according to ITU-R specified methodologies. Results of key performance indicators such as system capacity, scheduling delay, Physical Resource Block (PRB) utilization, percentage user satisfaction are shown.