Cooperative Transmission Under Limited Backhaul For LTE-A System

With the development of wireless communication technology, we have been living from the 3G across to the 4G, and the searching of the 5G has also been on agenda. LTE-A is the new mobile communication system. Its goal is faster transmission, better quality and wider coverage. Coordinated multi-point transmission(Co MP) is a promising technique for eliminating interference and supporting high spectral efficiency in the LTE-A network. However, this technique requires high-capacity backhaul links for connecting multiple base stations, which leads to high deployment costs and infeasible. Therefore, an effective data transmission algorithm is needed to reduce backhaul cost and improve system performance.In this paper, downlink Co MP data transmission strategies with limited-backhaul are studied. First of all, the basic architecture of LTE-A network and the key technologies are introduced. Secondly, the development background and status of Co MP under limited-backhaul are discussed. Thirdly, for small scenarios using static collaboration, a central data transmission algorithm using both S1 interfaces and X2 interfaces is proposed. Simulation results show that the proposed algorithm successfully improves system throughput as well as guarantees the access of users. Finally, for large scenarios using dynamic collaboration, a distributed data transmission algorithm is proposed. Simulation results show that the proposed distributed algorithm is convergent and can make better performance than central algorithm in large scenarios.