WCDMA网络覆盖与容量平衡策略研究.doc

毕业论文 WCDMA网络覆盖与容量的平衡策略研究 院（系）名称 专业名称 学生姓名 指导教师 20年5月日 WCDMA网络覆盖与容量平衡策略研究 摘 要 WCDMA是3G主流标准之一，与第二代移动通信系统的GSM相比主要的区别是空中接口和业务种类不同。WCDMA每个载频内所有用户共享频率、时间和功率资源，采用码分多址来区分信道。WCDMA支持可变速率业务、混合业务、高速数据分组业务；还支持上下行不对称业务同时提供足够大的容量和灵活的速率匹配方法的数据承载能力。同时，由于扩频码的正交性并不理想使得WCDMA系统存在自干扰性，信道隔离不如FDMA和TDMA。正是由于这些特点，使得WCDMA系统的规划比GSM要求更高。 网络规划中要求容量、覆盖之间有一个最佳平衡。 本文介绍了WCDMA系统中容量与覆盖的平衡研究。 首先介绍了WCDMA的系统特点和关键技术，由于WCDMA系统的覆盖上行受限，而系统容量下行受限，特别是当负荷较时，覆盖明显受限于上行链路，而容量受限于下行链路。 论文接着详细论述了覆盖和容量规划、链路预算、容量和覆盖的关系等。 最后总结出容量与覆盖平衡规划的设计方法。 关键字：WCDMA技术，覆盖，容量，平衡 The Balance Strategy Research on WCDMA Network Coverage and Capacity Author: Tutor: Abstract With the continuous improvement of user requirements for communication, as a kind of frequent business with 2 g GSM has gradually cannot satisfy the needs of users. WCDMA is the ITU (international telecommunication union) is a standard, it has evolved from the CDMA. WCDMA USES the direct sequence spread spectrum code division multiple access (DS - CDMA), frequency division duplex (FDD), code rate is 3.84 Mcps. WCDMA is one of the mainstream 3 g standard, compared with the second generation mobile communication system GSM is the main difference between the air interface and business types are different. WCDMA all users sharing within each carrier frequency, time and power resources, code division multiple access is used to distinguish between channels. WCDMA support variable rate services, mixed business, high speed data grouping operations; TDD also supports has asymmetric business at the same time provide enough capacity and flexible data carrying capacity rate matching method. At the same time, due to the orthogonality of the spread spectrum code isnt ideal make disruptive to the WCDMA system, channel segregation of TDMA and FDMA did. It is because of these characteristics, making the planning of WCDMA system is higher than GSM requirements. Requirements in network planning capacity,