GSM002—SDCCH拥塞问题处理.pptVIP

SDCCH拥塞问题处理 适用对象：PO 三级认证以下员工 发布单位： GSM网规网优部 GSM专题培训教材 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 版本说明 版本 日期 作者 审核 修改记录 V1.0 2009-03-15 江益 甘文军 增加案例 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 课程目的 了解SD信道占用的信令流程 了解SD信道拥塞的原因 了解SD信道拥塞的排查流程 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 目录 SD信道占用信令及其相关计数器 SD信令信道拥塞原因分类 SD信道拥塞排查步骤 案例 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 什么是SD信道拥塞？ 手机在位置更新、主叫、被叫过程的开始阶段，一般都要占用SD信道来交互信令 当BSC收到手机发来的SD信道请求后，就会查询SD信道资源情况，如果此时所有SD信道都被占用，就会出现一次拥塞 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. SDCCH信道拥塞指标定义 KPI名称 SDCCH blocking rate 指标定义 信令信道拥塞次数*100%/信令信道试呼次数 计数器公式 V2 (2.97) (C11625-C11626+C11697)*100%/(C11625+C11696) V3 (6.20) (C900060005+C900060011+C900060039)*100%/(C900060003+C900060010+C900060038) A 当网络无SDCCH信道时，会返回IMMEDIATE ASSIGNMENT REJECT消息，消息带有T3122定时器初始值。在T3122超时前，MS不允许再次发起信道请求 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. SD信道占用释放信令流程 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 目录 SD信道占用信令及其相关计数器 SD信令信道拥塞原因分类 SD信道拥塞排查步骤 案例 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. SDCCH信令信道拥塞原因分类 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 目录 SD信道占用信令及其相关计数器 SD信令信道拥塞原因分类 SD信道拥塞排查步骤 案例 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. SD信道拥塞排查步骤 整站下所有小区的SD拥塞可能与传输或参数有关 检查传输设备，排查传输告警 建议扩容SD信道或载频 检查LAC，VLR等参数的配置 接入原因主要包括4类： MOC MTC LOC 其他 通