面向配用电的MESH跨层资源分配研究

发布时间：2018-03-04 22:39

本文选题：配用电　切入点：MESH　出处：《华北电力大学(北京)》2014年硕士论文　论文类型：学位论文

【摘要】：由于电力系统配用电通信节点数量多,分布分散,地理环境恶劣,而且通信技术种类多,传输速率非常低,远远不能满足日益丰富的配用电业务需求,逐渐成为制约智能电网发展的瓶颈。为了改善配用电接入网络环境,本文从基于MESH的配用电通信网络拓扑结构、基于层次分析法的配用电业务建模和基于配用电业务模型稳定性的跨层资源分配三个方面分别对配用电接入网性能进行改善。本文首先对现有配用电通信网和WMN现状进行简单的介绍；然后结合现有配用电通信网拓扑结构,提出一种基于MESH网的配用电通信结构,该种网络结构可以根据具体的数据传输环境和电力系统业务需求采用合适的有线或者无线接入方式,可以在满足电力业务需求的前提下大大减少了配用电网络的建设成本。然后,针对配用电网络业务种类多,各种业务对网络的需求差异,本文从流量、可靠性、实时性三方面对配用电业务进行分析,并结合层次分析法最后对每种业务都计算出一个全局的权值,根据权值对不同业务进行分类排序,并进行相应的资源分配,从而满足不同业务传输要求,并提高配用电业务的通信实时性、可靠性和安全性,减少网络拥塞和丢包率,有利于实现配用电高速、实时、双向的数据采集、保护和控制业务。最后,针对配用电通信环境复杂,通信信道具有多径、衰落、时变或者频率选择性等特点,本文结合调度策略和资源分配,综合考虑上层业务的动态特征和物理层的信道特性,实现跨层的信息交换。从而确定各个用户待传输的数据量和资源分配方式。并提出一种控制实时业务抖动率和尽可能保障非实时业务稳定性的资源分配算法,其中核心是一种基于业务抖动的调度策略综合考虑业务到达模型和物理层可发送数据包数。根据调度策略,该调度策略对优先级高的实时业务优先分配资源,如果系统资源还有剩余,则根据非实时业务紧急度权重依次分配；而在物理层采用等功率资源分配策略,尽可能将信道好的子载波分配给业务,从而实现系统速率最大化的目的。在典型电力线信道环境下进行仿真和分析,结果表明本文资源分配算法在系统总吞吐量变化不大的前提下,可以保证实时业务的抖动性和非实时业务的稳定性,而且可以总体改善所有业务的整体性能,非常适合电力线通信系统。
[Abstract]:Because of the large number of distribution communication nodes, scattered distribution, bad geographical environment, and the variety of communication technology, the transmission rate is very low, which can not meet the increasing demand of distribution service. In order to improve the distribution and power access network environment, this paper starts with the topology structure of distribution communication network based on MESH. The performance of distribution access network is improved from three aspects: the modeling of distribution service based on analytic hierarchy process and the cross-layer resource allocation based on stability of distribution service model. Firstly, the existing distribution communication network and WMN are introduced in this paper. The current situation is briefly introduced; Then, combining with the existing topology of distribution communication network, a communication structure based on MESH network is proposed. This kind of network structure can adopt appropriate wired or wireless access mode according to the specific data transmission environment and power system business requirements. The construction cost of distribution network can be greatly reduced under the premise of satisfying the demand of electric power service. Then, in view of the variety of distribution network services and the difference in demand for various services to the network, this paper focuses on the flow, reliability, and reliability of the distribution network. In this paper, the distribution service is analyzed in three aspects of real time, and a global weight is calculated for each service by AHP, and the different services are classified and sorted according to the weights, and the corresponding resources are allocated. In order to meet the requirements of different service transmission, and improve the communication real-time, reliability and security of distribution service, reduce network congestion and packet loss rate, it is beneficial to achieve high-speed, real-time, two-way data acquisition. Finally, in view of the complex communication environment and the characteristics of multipath, fading, time-varying or frequency selectivity, this paper combines scheduling strategy and resource allocation. Considering the dynamic characteristics of the upper layer services and the channel characteristics of the physical layer, In order to determine the amount of data and resource allocation to be transmitted by each user, a resource allocation algorithm is proposed to control the jitter rate of real-time services and ensure the stability of non-real-time services as much as possible. The core of the strategy is a scheduling strategy based on service jitter which considers the number of packets sent by the physical layer and the service arrival model. According to the scheduling policy, the scheduling strategy allocates resources to the high-priority real-time services first. If the system resource is still surplus, it is allocated according to the non-real-time service emergency weight in turn; and the equal-power resource allocation strategy is adopted in the physical layer, and the subcarriers with good channel are allocated to the service as far as possible. The simulation and analysis in typical power line channel environment show that the resource allocation algorithm in this paper has little change in the total throughput of the system. It can ensure the jitter of real-time services and the stability of non-real-time services, and can improve the overall performance of all services, which is very suitable for power line communication systems.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM73

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