Study On LTE-advanced Based Dynamic Resource Allocation Technology Algorithm

The third generation mobile communication technology opens a new worldfor human beings. It can implement the wireless multimedia service and rapiddata transmission in real-time, so, people’s expectation to the4thgenerationmobile communication has arrived to a higher level as the4G could bring themore frequency resource, faster transmission speed, more flexiblecommunication, higher intelligence, and better compatibility, etc. And the utilityin commercial field of4G has been put on the agenda by MIITC which predictedthe licenses of4G would be granted to the three operations before the Dec. in2013. In Jan18thof2012, the ITU has formulated the LTE-Advanced, WirelessMan-Advanced (802.16m), TDD-LTE-Advanced and FDD-LTE-Advanced to bethe international standard of IMT-Advanced, which the last two standard areestablished by Chinese.LTE-Advanced is the evolution version of LTE, which target is to satisfythe higher need and application of the wireless communication market in the nextfew years. LTE-Advanced adopt the OFDM and MIMO technologies, and CarrierAggregation, enhanced MIMO, Coordinated Multi-Point Tx&Rx, Relay andother key technologies, all of which can improve the transmission rate,transmission efficiency of the cell edge and other characteristics in the wirelesscommunication system greatly. Although4G technology would change our dailylife, it has much drawback and difficulties, such as: the limited capacity, difficultskills, slowly equipment updating, etc. Hence, this paper proposed threealgorithms according to the actual situation and the application scenario toimprove the performance, enhance the system quality and make the standardadapt to the specific physical environment. The following is the introduction ofeach part of the dissertation:Firstly, it described the background and significance of the research aboutthe resource allocation in LTE-Advanced, introduced the developing history ofthe mobile communication, the evolution processing from LTE to LTE-Advanced,the main characteristics, vital technologies, and the current research about the relative theories, the algorithms and scheme about the adaptive resourceallocation.Secondly, the author presented the Carrier Aggregation technologies inLTE-Advanced in details, including the high level protocol, physical layerspecification, practical application scenarios, etc. And another important thing isto introduce the basic problem formulation of the traditional resource allocationalgorithm. The solution and simulation has been presented in the end of thechapter.Thirdly, the main content of this chapter was to allocate the frequency andpower resource rationally in a single cell. The whole process consists of threeparts: component carrier allocation, subcarrier allocation and the powerallocation. The two proposed algorithms were to improve the capability of theCC allocation. One was greedy algorithm (GA-CCA) which could converge inshort time and save calculation cache. And another was the cross entropy basedgreedy algorithm for CC allocation (CEGA-CCA), as its accuracy and efficiencywere better than the former algorithm. Therefore, the eNB should choose thesuitable method according to the actual situation to improve the performance ofthe system.Finally, we proposed a practical application scenario of LTE-Advanced cellin a region to increase the sum throughput of the whole communication system,through deploying the location of the eNBs and the sensed CC to avoid theco-channel interference, and aggregate a few component carriers in several cellsat the same time. The main algorithm of this Chapter was Particle SwarmOptimization (PSO), as the difficulty of the method was the design of the particleand the estimation of the amount of the subcarriers for each user.