Research Of Resource Scheduling Schemes For Multi-Traffic In LTE-Hi System

With the development of mobile communication technology, the traffic of Mobile Internet is growing rapidly, and the indoor traffic is increasing. To apapt to the indoor environment, the 3GPP standardization process has promoted the indoor hotspot scheme.LTE-Hi is deployed in the frequency band around 3.5GHz. It works in different frequency bands with LTE macro cellular networks, so the interference between macro-cell and micro-cell can be avoided. With the characteristics of small coverage and heavy transmission loss, the high-frequency band is more suitable for indoor environment. Besides,higher order modulation, such as 256QAM, is adopted to improve the spectral effciency.Wireless resource management is an impoatant research field of mobile communication system. Resource scheduling, as one of the key technologies of resource management, has aroused extensive attetion .However, few research related to resource scheduling focused on LTE-Hi networks. Therefore, this thesis carry out research on resource scheduling in LTE-Hi networks.Based on two projects, this paper studies resource scheduling in CoMP scenario and LTE-Hi networks respectively. Firstly, the background of wireless resource scheduling is introduced, and an overview of various typical wireless resource scheduling algorithms and mobile Internet service models is given. Then, an improved scheme is proposed to solve the problem of Max C/I algorithm in CoMP senario.The simulation and verification in Full Buffer model and FTP model is conducted, and the result shows that the modified scheme can enhance the throughput of system. Besides, based on the network characteristics of LTE-Hi system,, this thesis studies the influence of different channel quality feedback period on system performance. In order to characterize the LTE-Hi network more accurately, this thesis investigates a variety of propagation models and link adaptation techniques. Then, LTE-Hi system-level simulation platform is established. The simulation results show that in the LTE-Hi network, from the angle of throughput, when the CQI feedback period is extended to 2TTIs, the gain and cost are equivalent. But in other CQI feedback cycles, the gain is less than cost.Finally, this thesis proposes a modified PF algorithm for LTE-Hi to improve the system throughput. Simulation analysis is conducted for multi-traffic and results show that the modified PF algorithm can improve system throughput in Full Buffer, FTP and FTP / VoIP mixed traffic model, thereby improving system performance.