Prioritized dynamic multitraffic scheduler for downlink in LTE

Abstract

Long Term Evolution (LTE) is an all IP packet system in which guaranteeing QoS is a real challenge. The LTE aims to provide a maximum data rates of 100Mbps for downlink and 50Mbps for uplink when 20 MHz bandwidth is used. The scheduler takes different considerations into account such as throughput and fairness when deciding the allocation of the scarce radio resources. Therefore the LTE MAC scheduler should consider not only the throughput optimization but also the QoS differentiations in an effective manner. The objective of this project is to focuses on enhancing the performance of LTE downlink scheduling. This project work proposes and implements a, "Dynamic Multitraffic Scheduler" which uses dynamic bandwidth and Resource Blocks (RBs) allocations based on number of service classes. The proposed scheduler also considers the different users channel conditions and tries to create a balance between the Quality of service (QoS) guarantees and the multi-user diversity in a proportional fair manner. Round Robin (RR), Best Channel Quality Indicator (BCQI), Proportional Fair (PF) and Opportunistic scheduling are investigated and compared for both existing and proposed scheduler.

Simplified Framework for Benchmarking Standard Downlink Scheduler over Long Term Evolution

“…The effect of the TCP variance and combination of the Scheduler on the performance is studied by the authors Adesh and Renuka [17] and observe that the TCP-Westwood performs best out of all combinations. The authors Sundari et al [18] implement a scheduler to improvise its performance, where they use service class for the bandwidth and resource allocation dynamically with the channel into consideration and offers better understanding as compared to the Round Robin (RR), Best Channel Quality Indicator (BCQI), Proportional Fair (PF) and Opportunistic scheduling. The research of minimizing the energy consumption by the eNodeB is an open research problem in LTE, In the work of Rebekka et al [19] utilizes the spectrum effectively in reduced energy using the suitably allocate the resource blocks so that even throughput improvises.…”

“…The authors Sundari et al [26] proposes a dynamic multitraffic scheduler to allocate the bandwidth and the resources dynamically by considering the UE channel status and performs better than a round-robin and Best Chanel quality indicator. The authors Alotaibi and Akl [27] also propose a packet scheduler where both the UE and the physical resource block are considered design parameters and perform better than round-robin.…”