An Effective Queuing Model Based Bandwidth Allocation Scheme for Fair Qos Provisioning in Lte Systems

In this paper, we propose a novel bandwidth allocation scheme that will guarantee quality-of-service (QoS) support in the downlink (DL) of a LTE-A system. The proposed scheme is developed based on a queuing model that links important performance metrics of DL service flows of LTE-A systems to a set of tunable parameters. Based on the outcome of the results of the queuing model, the performance metrics are set. The bandwidth allocation scheme then uses the pre-determined performance parameters in making the scheduling decisions. In order to achieve the best results from the proposed scheme, the scheme is integrated with the slot allocation process that is carried out in the physical layer. LTE-A systems uses orthogonal frequency-division multiple access (OFDMA) slot allocation mechanism that adapts to channel conditions at the destination mobile stations (MSs). The proposed scheme performs better than the conventional approach in terms of system throughput, delay and packet dropping ratio, thereby, improving the QoS of the overall system. Further the proposed system is simple in design and its cross-layer approach guarantees improved resource utilization especially in the presence of link adaptations and channel fading. Simulation results have demonstrated that the proposed scheme provides better QoS support for both real-time and non-real-time applications in LTE-A systems.