WCDMA负载控制分析的.docx

毕业设计（论文）设计（论文）题目：WCDMA系统负载控制分析摘 要 WCDMA系统中，由于过高的负载会造成系统不稳定，容量下降，网络达不到基本的覆盖要求，通话质量受到严重影响，所以需要负载控制将符合维持在一定的范围内，以便系统地正常运行。在一个实时测量系统小区的系统负荷，当系统负荷平均值在一个设定的时间内超过设定的阀值，就有必要对该系统的负荷进行负载控制。 负载控制从技术方面主要分为四个部分：拥塞控制，准入控制，小区间负载的平衡以及数据调度。准入控制涉及负载监测和衡量、负载预测、不同业务的准入策略、不同呼叫类型的准入策略。而且，上下行链路要分别进行准入控制；小区间负载的平衡主要包括：同频小区间负载的平衡、异频小区间负载的平衡、潜在用户控制；数据调度是为了提高小区资源的利用率，引入分组调度技术，在小区内的速率不可控业务负载过大或过小时，降低或增加BE业务的吞吐率，以控制小区的整体负载在一个稳定的水平；拥塞控制是在前三种技术为基础，为了保证其系统绝对的稳定而引入的技术。其目的就是保证系统的负载处于绝对稳定的门限值以下。 对于WCDMA中的网络数据业务，随着WCDMA业务的快速发展，用户数量的快速增长，数据业务对现有的网络资源带来了巨大的冲击，网络资源的使用率不断地增高，WCDMA网络便出现了CE资源、码资源、功率资源、带宽资源等等网络资源的拥塞，甚至出现了用户无法介入或者业务质量变得很差等现象，导致用户感知度下降等问题。所以要通过负载控制中的网络资源优化方法来将小区的网络资源合理的分配，从而能达到合理利用资源，提升3G在市场中的竞争力。【关键词】 WCDMA 负载控制 拥塞控制 准入控制 负载均衡 网络资源优化 ABSTRACT In WCDMA systems, due to the excessive loads may cause system instability, decline in capacity, coverage of a network does not meet the basic requirements, and call quality has been seriously affected, so you need to load control will meet at a certain range so that the system to normal operation. System load in a real-time measuring system for residential area, within a set time when system load averages exceeds a set threshold, it is necessary to load the system load control. Load control technologies can be divided into four parts: congestion control, access control, load-balancing between community and data schedules. Access control involves load monitoring and measurement, load forecasting, access to different business strategies, different types of call admission policy. And, upper and lower line chain road to respectively for access control; community between load of balance main including: with frequency community between load of balance, and ISO frequency community between load of balance, and potential user control; data scheduling is to improve community resources of utilization, introduced group scheduling technology, in community within of rate not controlled business load had big or had hours, reduced or increased BE business of Huff rate