Femtocell双层网络中的资源分配研究
发布时间：2018-12-07 18:30
【摘要】：当毫微微小区(Femtocell)高密度部署时,在频谱共享的毫微微小区网络中,毫微微小区之间的同层干扰以及毫微微小区与宏小区(Macrocell)之间的跨层干扰严重限制了系统的性能。在Femtocell大规模部署时,急需解决Femtocell双层网络中的干扰问题。为缓解干扰,本文研究了宏基站与Femtocell共信道部署组成的Femtocell双层网络中的下行链路资源分配问题。第三代合作伙伴计划(The 3rd Generation Partnership Project,3GPP)标准中规定了毫微微小区的三种接入模式:封闭接入模式、开放接入模式以及混合接入模式。本文研究了Femtocell封闭接入方式下的资源分配策略和Femtocell混合接入方式下的信道分配算法。首先,提出了一种基于分组的Femtocell封闭接入方式下的资源分配算法。该算法包括两部分:一部分是宏基站先利用改进的匈牙利算法为宏小区用户分配信道,再用注水算法分配功率,保证宏小区用户的正常传输;另一部分是在避免干扰宏小区用户的基础上,先采用模拟退火算法对毫微微小区进行分组,再进行信道和功率分配,在满足毫微微小区用户的数据速率需求的同时最大化频谱效率。仿真结果表明,该算法有效地抑制了这两种干扰,既能保证用户的数据速率需求,又能有效提升网络频谱效率。其次,提出了一种适用于Femtocell混合接入方式的信道分配算法。该算法包括两部分:一部分是根据毫微微小区间的干扰将毫微微小区分到不同的组中,用来减少信道分配的复杂度并减少它们之间的干扰;另一部分是为宏小区用户和毫微微小区用户分配信道,消除它们之间的频谱冲突,在保证授权用户服务质量需求(Quality of Service,QoS)的同时提升非授权用户的性能。仿真结果表明,该算法既能保证用户的数据速率需求,又能保证用户间的公平性。
[Abstract]:When the femto cell (Femtocell) is deployed with high density, the performance of the system is severely limited by the same layer interference between the femto cell and the (Macrocell) between the femto cell and the macro cell in the spectrum shared femto cell network. When Femtocell is deployed on a large scale, it is urgent to solve the interference problem in Femtocell double layer network. In order to mitigate interference, the downlink resource allocation problem in Femtocell bilevel network composed of Acer station and Femtocell co-channel deployment is studied in this paper. The third Generation Partnership Program (The 3rd Generation Partnership Project,3GPP) standard specifies three access modes for femto cells: closed access mode, open access mode and hybrid access mode. In this paper, the resource allocation strategy for Femtocell closed access and the channel allocation algorithm for Femtocell hybrid access are studied. Firstly, a resource allocation algorithm based on packet-based Femtocell closed access is proposed. The algorithm consists of two parts: one is that Acer station first allocates channels for macro cell users by using the improved Hungarian algorithm, and then distributes power by water injection algorithm to ensure the normal transmission of macro cell users; In the other part, on the basis of avoiding interference with macro cell users, simulated annealing algorithm is used to group the femto cells, and then channel and power distribution are carried out. The spectrum efficiency is maximized while satisfying the data rate requirements of femto cell users. Simulation results show that the proposed algorithm can effectively suppress these two kinds of interference, which can not only guarantee the data rate requirements of users, but also effectively improve the spectral efficiency of the network. Secondly, a channel allocation algorithm for Femtocell hybrid access is proposed. The algorithm consists of two parts: one is to divide the femto cells into different groups according to the interference of the femto cell to reduce the complexity of channel allocation and to reduce the interference between them; The other part is to allocate channels to macro cell users and femto cell users to eliminate the spectrum conflicts between them and to improve the performance of unauthorized users while guaranteeing the quality of service (Quality of Service,QoS) requirements of authorized users. The simulation results show that the algorithm can not only guarantee the data rate requirement of users, but also ensure the fairness between users.
【学位授予单位】：重庆邮电大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.5
本文编号：2367636
[Abstract]:When the femto cell (Femtocell) is deployed with high density, the performance of the system is severely limited by the same layer interference between the femto cell and the (Macrocell) between the femto cell and the macro cell in the spectrum shared femto cell network. When Femtocell is deployed on a large scale, it is urgent to solve the interference problem in Femtocell double layer network. In order to mitigate interference, the downlink resource allocation problem in Femtocell bilevel network composed of Acer station and Femtocell co-channel deployment is studied in this paper. The third Generation Partnership Program (The 3rd Generation Partnership Project,3GPP) standard specifies three access modes for femto cells: closed access mode, open access mode and hybrid access mode. In this paper, the resource allocation strategy for Femtocell closed access and the channel allocation algorithm for Femtocell hybrid access are studied. Firstly, a resource allocation algorithm based on packet-based Femtocell closed access is proposed. The algorithm consists of two parts: one is that Acer station first allocates channels for macro cell users by using the improved Hungarian algorithm, and then distributes power by water injection algorithm to ensure the normal transmission of macro cell users; In the other part, on the basis of avoiding interference with macro cell users, simulated annealing algorithm is used to group the femto cells, and then channel and power distribution are carried out. The spectrum efficiency is maximized while satisfying the data rate requirements of femto cell users. Simulation results show that the proposed algorithm can effectively suppress these two kinds of interference, which can not only guarantee the data rate requirements of users, but also effectively improve the spectral efficiency of the network. Secondly, a channel allocation algorithm for Femtocell hybrid access is proposed. The algorithm consists of two parts: one is to divide the femto cells into different groups according to the interference of the femto cell to reduce the complexity of channel allocation and to reduce the interference between them; The other part is to allocate channels to macro cell users and femto cell users to eliminate the spectrum conflicts between them and to improve the performance of unauthorized users while guaranteeing the quality of service (Quality of Service,QoS) requirements of authorized users. The simulation results show that the algorithm can not only guarantee the data rate requirement of users, but also ensure the fairness between users.
【学位授予单位】：重庆邮电大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.5
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