TD-SCDMA系统中动态信道分配技术

发布时间：2018-04-27 17:27

本文选题：TD-SCDMA系统 + 遗传算法　；参考：《西安电子科技大学》2013年硕士论文

【摘要】：随着移动通信技术的迅速发展，第三代移动通信系统已全面步入商用。TD-SCDMA移动通信系统作为我国第一个拥有自主知识产权的国际电信标准，在我国已经进入大规模应用阶段。TD-SCDMA采用的TDD工作模式，适合动态信道分配（Dynamic Channel Allocation，DCA）技术的实施。优秀的DCA算法可以充分发挥TD-SCDMA系统资源分配灵活的特点，使系统获得最佳的资源利用率，从而提高系统的容量。本文在国内外DCA算法研究基础上，首先提出了一种适用于TD-SCDMA系统的慢速动态信道分配算法。该算法把分布式遗传算法（Distributed GeneticAlgorithm，DGA）应用到TD-SCDMA中的上下行时隙分配中，利用遗传算法高效的全局搜索能力，综合考虑一个无线网络管理器（Radio Network Controller，RNC）中的所有小区。算法首先把上下行时隙的分配比例作为基因的编码，一个RNC中的小区数作为染色体长度，然后把初始种群划分为四个子种群，每个子种群采用不同的交叉变异概率，同时各个子种群根据自身功能，选择相似程度不同的两个个体进行交叉操作，以充分发挥各个子种群的探索和利用功能。仿真表明，该算法可以更好的保持种群多样性，提高了TD-SCDMA系统的容量。其次，本文在基于“年龄”选择机制的分布式遗传算法基础上，改进了迁移个体的选择策略，，并把改进后的算法应用到TD-SCDMA系统的快速信道分配中。算法的主要思想是根据各个时隙的负载状况确定需要进行时隙切换的用户，利用分布式遗传算法快速、高效的计算能力为需要进行时隙切换的用户和新接入的用户分配时隙，使各个时隙负载均衡，从而增加系统容量。
[Abstract]:With the rapid development of mobile communication technology, the third generation mobile communication system has entered the commercial. TD-SCDMA mobile communication system as the first international telecommunication standard with independent intellectual property rights. In China, the TDD mode adopted by TD-SCDMA has entered the stage of large-scale application, which is suitable for the implementation of dynamic Channel allocation (DCA) technology for dynamic channel allocation. Excellent DCA algorithm can give full play to the characteristics of flexible resource allocation in TD-SCDMA system, make the system obtain the best resource utilization, and improve the system capacity. Based on the research of DCA algorithm at home and abroad, a slow dynamic channel assignment algorithm for TD-SCDMA systems is proposed in this paper. This algorithm applies distributed genetic algorithm (DGA) to the uplink and downlink slot allocation in TD-SCDMA, and takes advantage of the efficient global search ability of genetic algorithm to consider all the cells in a wireless network manager, Radio Network Controller (RNCs). The algorithm first takes the allocation ratio of up-down time slot as gene coding, the number of cells in a RNC as chromosome length, and then divides the initial population into four sub-populations, each of which uses different crossover mutation probability. At the same time, according to their own functions, each sub-population selects two individuals with different similarity to carry out cross-operation, in order to give full play to the exploration and utilization function of each sub-population. Simulation results show that the algorithm can better maintain population diversity and improve the capacity of TD-SCDMA system. Secondly, on the basis of distributed genetic algorithm based on "age" selection mechanism, this paper improves the selection strategy of migrating individuals, and applies the improved algorithm to the fast channel allocation of TD-SCDMA system. The main idea of the algorithm is to determine the users who need slot switching according to the load condition of each slot, and to allocate time slots to users who need slot switching and new access users by using distributed genetic algorithm fast and efficient computing power. Load balance between time slots, thereby increasing system capacity.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TN929.5

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