基于异构无线通信网络的切换算法研究
发布时间：2018-08-31 08:17
【摘要】：在通信网络飞速发展的今天,用户对于网络性能的要求越来越高,多网融合可以显著提升系统性能,因此异构无线网络正在成为未来通信发展的趋势之一。与此同时,家庭基站等小型网络技术的引入对异构网络切换系统提出了更高的技术要求。本文针对目前异构网络切换判决算法准入标准复杂,无线链路失败率高等缺点,提出改进的切换算法。首先,本文提出一种改进的基于速度感知机制的层次切换算法。针对现有异构网络切换算法大多没有考虑家庭基站等小型网络自身的技术局限,在异构网络中,用户切换容易造成较高的时延和切换失败率等问题,该算法的解决方案主要包含以下两点:1、通过划分网络参数层次来降低算法复杂度,随后通过多参数判决算法优化网络选择排序。2、针对家庭基站等小型网络自身发射功率低,覆盖半径小的特点,生成额外的速度准入机制,提高切换的成功率。仿真结果表明,改进之后的算法提高了切换的成功率,优化了系统的切换性能。其次,本文提出一种改进的基于自优化网络机制的单步调试切换算法。现有的异构网络切换算法大多片面于单一的切换性能指标,但在实际环境中,各系统指标总是互相影响的,所以应在考量全局性能的基础上,有侧重地降低一些显著影响系统通话质量的指标。该算法主要包括以下两点:1、通过结合上文提及的层次切换算法,在优化系统准入控制的同时,采样用户切换期间的掉话率,切换失败率以及乒乓切换率,为单步调试机制提供依据。2、单步调试机制通过分析各切换性能,更新系统切换参数,反馈到切换判决系统,实现系统切换参数的动态调整,提高切换成功率。此机制既有利于前期的网络选择,又有利于后期的性能调试,从而实现全链路的性能优化。仿真结果表明该切换算法能够显著提高系统整体切换性能,同时减少性能优化所需时间。
[Abstract]:With the rapid development of communication network, users have higher and higher requirements for network performance, and multi-network convergence can significantly improve the performance of the system. Therefore, heterogeneous wireless networks are becoming one of the trends of communication development in the future. At the same time, the introduction of small network technologies, such as home base stations, puts forward higher technical requirements for heterogeneous network handoff systems. In this paper, an improved handoff algorithm is proposed to overcome the complexity of admission criteria and the high failure rate of wireless links in heterogeneous networks. Firstly, an improved hierarchical handoff algorithm based on speed sensing mechanism is proposed. Most of the existing handoff algorithms in heterogeneous networks do not consider the technical limitations of small networks such as cell base stations. In heterogeneous networks, user handoff is prone to cause high delay and handover failure rate. The solution of the algorithm mainly includes the following two points: 1, reducing the complexity of the algorithm by dividing the layer of network parameters, and then optimizing the sorting of network selection by multi-parameter decision algorithm, aiming at the low transmitting power of small networks such as home base stations, etc. With small coverage radius, additional speed access mechanism is generated to improve the success rate of handoff. Simulation results show that the improved algorithm improves the success rate of handoff and optimizes the performance of the system. Secondly, an improved single step debugging handoff algorithm based on self-optimization network mechanism is proposed. Most of the existing handoff algorithms in heterogeneous networks are one-sided to a single handoff performance index, but in the actual environment, the system indexes always affect each other, so we should consider the overall performance of the system. Focus on reducing some of the significant impact on the quality of the system call indicators. The algorithm mainly includes the following two points: 1. By combining the hierarchical handoff algorithm mentioned above, the system access control is optimized, and the drop rate, the handoff failure rate and the ping-pong handoff rate during the switching period are sampled. By analyzing the switching performance, updating the system switching parameters and feedback to the switching decision system, the single-step debugging mechanism realizes the dynamic adjustment of the system switching parameters and improves the switching success rate. This mechanism is not only conducive to the early network selection, but also conducive to the later performance debugging, so as to achieve the performance optimization of the whole link. Simulation results show that the proposed handoff algorithm can significantly improve the overall performance of the system and reduce the time required for performance optimization.
【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】：TN92
本文编号：2214422
[Abstract]:With the rapid development of communication network, users have higher and higher requirements for network performance, and multi-network convergence can significantly improve the performance of the system. Therefore, heterogeneous wireless networks are becoming one of the trends of communication development in the future. At the same time, the introduction of small network technologies, such as home base stations, puts forward higher technical requirements for heterogeneous network handoff systems. In this paper, an improved handoff algorithm is proposed to overcome the complexity of admission criteria and the high failure rate of wireless links in heterogeneous networks. Firstly, an improved hierarchical handoff algorithm based on speed sensing mechanism is proposed. Most of the existing handoff algorithms in heterogeneous networks do not consider the technical limitations of small networks such as cell base stations. In heterogeneous networks, user handoff is prone to cause high delay and handover failure rate. The solution of the algorithm mainly includes the following two points: 1, reducing the complexity of the algorithm by dividing the layer of network parameters, and then optimizing the sorting of network selection by multi-parameter decision algorithm, aiming at the low transmitting power of small networks such as home base stations, etc. With small coverage radius, additional speed access mechanism is generated to improve the success rate of handoff. Simulation results show that the improved algorithm improves the success rate of handoff and optimizes the performance of the system. Secondly, an improved single step debugging handoff algorithm based on self-optimization network mechanism is proposed. Most of the existing handoff algorithms in heterogeneous networks are one-sided to a single handoff performance index, but in the actual environment, the system indexes always affect each other, so we should consider the overall performance of the system. Focus on reducing some of the significant impact on the quality of the system call indicators. The algorithm mainly includes the following two points: 1. By combining the hierarchical handoff algorithm mentioned above, the system access control is optimized, and the drop rate, the handoff failure rate and the ping-pong handoff rate during the switching period are sampled. By analyzing the switching performance, updating the system switching parameters and feedback to the switching decision system, the single-step debugging mechanism realizes the dynamic adjustment of the system switching parameters and improves the switching success rate. This mechanism is not only conducive to the early network selection, but also conducive to the later performance debugging, so as to achieve the performance optimization of the whole link. Simulation results show that the proposed handoff algorithm can significantly improve the overall performance of the system and reduce the time required for performance optimization.
【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】：TN92
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，本文编号：2214422
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