C-RAN基带池内关联任务调度研究

发布时间：2018-09-07 14:00

【摘要】：C-RAN是新型的绿色无线接入网构架,采用减少分布机房的方式实现功耗的降低,并运用了虚拟化和协作技术,实现共享基带资源和任务的灵活调度,进而提升频谱资源的利用效率,节约处理成本,改善系统性能。结合基带池内任务的关联性特点和CoMP技术中信号的并行化特点,集中化的资源管理会使任务调度复杂化,因此,高效的关联任务调度机制在C-RAN网络中变得迫切且重要。首先,我们介绍了C-RAN架构中的虚拟化技术及其应用,分析了基带池中虚拟资源在物理资源上的部署问题,列举了一些任务调度的常用算法,并给出了遗传算法在基带池解决关联任务调度的实际应用。然后,本文从任务关联性的角度出发,提出了一种基于虚拟基带池差异化配置的关联任务调度机制。在现有通信协议下,基带池内的任务模块是顺序关联的,不能采用以往分布式任务调度的方法。本文将虚拟基带池中所有虚拟机划分为若干个集群,并根据任务要求对不同集群内的虚拟机进行差异化配置,对同一集群内的虚拟机进行均匀配置,进而依据任务的属性将各关联任务调度到对应集群的虚拟机上运行,完成关联模块的高效调度与处理。最后,我们考虑了CoMP技术在C-RAN基带池中的特点,提出了一种基于CoMP同步约束的关联任务调度机制。本文分析了由于距离差异和多径时延等原因,协作RRU产生的多路并行信号传输到基带池后存在时延差异、频率偏移等问题。为了完成这些关联模块处理后及时的数据合并,本文对载波同步、信道估计等串行模块进行同步处理,并以均方根时延作为衡量标准对上述任务调度机制进行了验证。
[Abstract]:C-RAN is a new type of green wireless access network architecture, which reduces power consumption by reducing distributed computer room, and realizes flexible scheduling of shared baseband resources and tasks by using virtualization and collaboration technology. Furthermore, the utilization efficiency of spectrum resources is improved, the processing cost is saved, and the system performance is improved. Combined with the characteristics of task correlation in baseband pool and signal parallelization in CoMP technology, centralized resource management will complicate task scheduling. Therefore, efficient associated task scheduling mechanism becomes urgent and important in C-RAN networks. Firstly, we introduce the virtualization technology and its application in C-RAN architecture, analyze the deployment of virtual resources on physical resources in baseband pool, and enumerate some common algorithms for task scheduling. The practical application of genetic algorithm in the baseband pool to solve the associated task scheduling is also given. Then, from the point of view of task relevance, this paper proposes an associated task scheduling mechanism based on virtual baseband pool differential configuration. Under the existing communication protocols, the task modules in the baseband pool are sequentially associated, and the previous distributed task scheduling methods cannot be adopted. In this paper, all virtual machines in the virtual baseband pool are divided into several clusters, and the virtual machines in different clusters are configured differently according to the task requirements, and the virtual machines in the same cluster are configured uniformly. Then each associated task is scheduled to run on the virtual machine of the corresponding cluster according to the attributes of the task to complete the efficient scheduling and processing of the association module. Finally, considering the characteristics of CoMP technology in C-RAN baseband pool, we propose an associated task scheduling mechanism based on CoMP synchronization constraint. In this paper, due to the distance difference and multipath delay, the problems such as delay difference and frequency offset are analyzed when the multi-channel parallel signal generated by cooperative RRU is transmitted to the baseband cell. In order to complete the timely data merging after these associated modules are processed, the serial modules such as carrier synchronization, channel estimation and so on are synchronized, and the above task scheduling mechanism is verified by the RMS delay.
【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】：2014
【分类号】：TN925.93

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