Research On Enhancement Technologies Of LTE-ADVANCED Indoor&Hotspot Scenario

With the development of mobile terminal and data traffic, the scenario and kind of mobile traffic have changed in a certain degree:on the one hand, the ratio of data traffic of indoor and hotspot scenario to the whole data traffic is higher. Almost80percent of data traffic has happened at indoor and hotspot scenario; on the other hand, because of the popularity of multi-media traffic, users have more and more need on high speed data traffic. With the development of mobile communication, the research on indoor and hotspot scenario is more and more important. Among the proposals of3GPP R12, the indoor and hotspot scenario is proposed as important and critical research by many organizations. And the enhancement technologies of indoor and hotspot scenario is a important research direction. These technologies can improve system performance from different target.This paper systematically discusses that during the process of MIIT key project-"Later IMT-Advanced Mobile Communication Technology and Development Strategy Research", I research on the enhencement technologies of indoor and hotspot scenario of LTE-A. The mainly work of this paper are as follows:1)This paper introducts the characteristics of indoor and hotspot scenario and several enhencement technologies. Then it analyzes theoretical basis of higher order modulation technology and dynamic TDD technology. Depending on present research progress, this paper points to the problem and research direction of these two technologies.2) Focusing on the higher order modulation that is an enhancement technologies of indoor and hotspot scenario, this paper systematically analyzes the higher order modulation technology and studies on feasibility of higher order modulation technology from link level and system level. Then, refering to CQI feedback from mobile station to base station, this paper designs CQI table and MCS table of256QAM. After that, to decrease terrible block error rate, this paper deeply initially proposes this method based on traditional transport block size design method. At last, through contrast simulation of system level, this method in this paper can bring21.09%gain of average spectrum efficiency.3) Facing the cross timeslot interference problem from dynamic TDD technology, this paper firstly investigates two kinds of the cross timeslot interference-interference between base stations and interference between mobile stations. And this paper respectively analyzes the reasons and proposes a timeslot allocation algorithm based on region and power. To reduce the interference between mobile stations, this algorithm distinguishs different mobile stations depending on the interference signal. And about interference of base stations, this paper analyzes that transmit ting power of base station is the main reason. So depending on the channel model of indoor and hotspot scenario, this paper proposes the semi-static method of power control. At last, through simulation and verification of system level, this algorithm can effectively decrease cross timeslot interference and increase system performance.