3G核心网网规划ppt课件.pptVIP

3G核心网规划 SLC ICM N CS 2004. May 议程 议程 网络规划 – 从空中接口到因特网 3G网络规划特点 3G网络规划必须考虑各多种业务的需求及话务模型的影响，详细的数据流量的计算将代替简单的基于语音话务量的计算方式。 3G的网络容量将没有单纯的限制, 而更多地取决于话务模型和QoS的定义。 3G 网络涉及更多组成部分, 因此需要考虑更多的规划内容 (core, radio, access, OM, signaling. 3G adds IP, IMS, WLAN)。 3G 网络规划过程 网络规划的主要领域 接入网规划概述 接入网规划概述 核心网规划概述 核心网电路域规划 核心网分组域规划 主要包括： 规划分组域业务 设计网络拓扑结构 路由策略及协议 网络冗余及安全因素的考虑 IP地址规划 …… ISP / IT规划 主要包括： 定义拓扑结构 计算数据量 规划硬件 安全性考虑 规划IP地址 …… 接口规划 结点规划 议程 术语：Busy Hour Call Attempt, Mean Holding Time, Blocking Probability Busy hour call attempts (BHCA) specifies the number of call attempts that are either originated by or terminating during the busy hour. This parameter covers all successful and unsuccessful call attempts. ? Mean holding time (MHT) is the average duration for a call attempt, no matter whether successful or not. ? The maximum allowable blocking probability (P) this value represents the major quality criterion, it specifies an acceptable rate with which call attempts can be blocked by the network due to lacking resources. This value can either be defined as an end-to-end value or for an individual interface. 术语：Offered Traffic, Carried Traffic and Number of Outgoing Lines Offered traffic A: Traffic which would occur, in case all call attempts would be successful. Offered traffic cannot be measured directly, since also unsuccessfull call attempts occur in a PLMN. Carried traffic y: Traffic which can be through-connected to outgoing lines. Number N of outgoing lines: Number of lines on which the carried traffic is splitted. Loss- 和 Queuing-Systems Loss- 和 Queuing-Systems的特征 pure loss-system特征: 在发生阻塞的情况下，incoming call attempts会马上被拒绝。 这些呼叫并不被存储起来，而是被丢掉，因而并不计入carried traffic y (ClassicGSM). pure queuing-system特征: 在发生阻塞的情况下，incoming call attempts会被送入一个队列（queue）。 只要有出中继出现空闲，原先存储在队列中的call attempt会被释放，通过出中继进行呼叫接续（Packet orieted like GPRS）。 Loss-Systems的通用话务流向 Erlang B Statistics举例 议程 业务模型 3G中的QoS概念 业务与QoS的映射 话务量计算：电路域 电路域话务量计算所需相关参数： 用户数(number_of_subscribers) 数据速率[kbit/s](informatio