Research Of Resource Scheduling Schemes For Multi-Traffic In LTE-A MU-COMP System

With a growing demand to support larger throughput with higher spectral efficiency in mobile networks, Multiple Input Multiple Output (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM) have been introduced in the Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) and Long Term Evolution Advanced (LTE-A). Unlike the intra-cell interference, the inter-cell interference still cannot be eliminated in the MIMO-OFDM system. Thus CoMP technology has been initiated as an effective way to mitigate the inter-cell interference and increase cell average and cell-edge throughput in3GPP Release11. According to the number of users which are served by the same time-frequency resource of CoMP cooperative nodes, CoMP technology are divided into SU-CoMP and MU-CoMP. Compared with SU-CoMP, MU-CoMP technology can obtain a larger increasing in cell average and cell edge spectrum efficiency at the cost of system complexity. In LTE-A MU-CoMP system, the resource allocation and scheduling scheme for multi-traffic of multi-user can optimize wireless networks resource scheduling and give an effiecent solution to balance the wireless resources efficiency, QoS and fairness for multi-traffic. MU-CoMP technology can support higher data rates, more reliable quality of service and more diverse types of traffic and help improve the overall performance of the system and meet the needs of different users in limited bandwidth.The main contributions of this paper include:First, the paper introduces the research background and purpose of resource scheduling schemes for multi-traffic in LTE-A MU-CoMP system. Secondly, this paper builds a system level simulation platform of LTE-A SU/MU-CoMP and evaluates its performance. Based on a LTE MU-COMP system level simulation platform developed by MATLAB, the paper adds the multi-traffic model to manage different traffics, which include VoIP, FTP and VoIP-FTP. It achieves resource scheduling schemes for multi-traffic, handover between SU-CoMP and MU-CoMP and other functions. This paper evaluates the performance of resource scheduling algorithms for VoIP, FTP and VoIP-FTP under different CoMP transmission mode and proposes improvement in the schemes.In addition, this paper designs and implements a LTE-A CoMP transmission handover scheme for multi-traffic. It makes a compromise between system performance and complexity and presents a best selection of CoMP transmission modes to adjust to different types of traffics. It can improve the transmission quality and overall system performance for CoMP users. Simulation verifies how to set the handover parameters and the scheme is efficient.Finally, combing the advantages of the centralized and distributed scheduling strategies, we propose a novel cooperative scheduling scheme, i.e.3-SNC scheme. In the scheme, we divide the system into Centralized Regions (CRs) of3sectors and use the orthogonal division of resources in time-domain to authorize CRs in turn for CoMP transmission. The proper designing of the authorizing cycle can reduce the system complexity and interaction time delay. From the simulation results, it can be seen that the proposed scheme is close to the centralized global scheduling method in cooperative performance, but needs less negotiation than the distributed local scheduling method.