Uplink Scheduling Algorithm In Ralay-Assisted LTE-A System

In order to solve the problem of low edge user throughput in LTE-A system, it’s an effective method to deploy relays in the cell. However, after adding relays, the scheduling problem is more complicated. Resource allocation among users as well as users and relays needs to be considered. So this problem has recently become widespread concern. This paper deeply studies on the scheduling algorithm in relay-assisted LTE-A system.This paper first adapted classical scheduling algorithm in LTE system to relay-assisted LTE-A system. Then proposed an innovate QoS-aware uplink scheduling algorithm for LTE-A system with relays. While emulating QoS-aware services with different bit-rate and delay budget requirements for the upstream direction, we propose a new QoS-aware scheduling algorithm for in-band relays. In this work, a scheduling metric calculation method and bit-rate guarantee scheme is applied. Moreover, we propose an efficient scheme for the backhaul link allocation which allows a relay to transmit information of the most backlogged users first. Finally, we conclude with simulation results to demonstrate how the proposed resource allocation strategy improves the performance of the system.This article also describes two uplink performance enhancement methods, including multi-user MIMO and uplink power control. In the multi-user MIMO study, we proposed a new user pairing algorithm. This algorithm was based on the user channel orthogonality and estimated SINR. In the uplink power control study, the simulation analysis for power control algorithm in relay-assisted LTE-A system was shown.