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所在平台: Udemy |
课程主页: https://www.udemy.com/course/csfb-volte-optimization/
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**课程名称：** CSFB & VoLTE 基础与优化 (CSFB & VOLTE Basics & Optimization) **课程概述：** 本课程专注于4G网络中的语音通话优化技术，重点讲解Circuit Switched Fallback (CSFB) 和 Voice over LTE (VoLTE) 的相关概念、工作原理和优化方法。课程内容涵盖理论知识和实际操作细节，适合对4G移动通信有基本了解的初学者和专业人士。 **课程结构：** * **第一部分：引言** * 课程介绍 * CS和PS基础回顾 * LTE网络架构快速回顾 * 4G承载 (Bearers) * 4G语音通话介绍 * **第二部分：CSFB - 电路交换回落** * CSFB需求 * CSFB发起呼叫步骤 * 盲呼、闪呼和带测量的CSFB * CSFB接收呼叫步骤 * CSFB配置优化参数 * **第三部分：VoLTE - LTE语音** * VoLTE的定义及其优势 * 基础知识回顾 * VoLTE中的高清通话编码 (HD Calls Coding) * IMS架构 * VoLTE QCIs (QoS Class Identifiers) * SIP基础 * 注册流程 (Registration Flow) * 呼叫场景 (Call Scenario) * UE在connected模式下的行为 (切换，HO) * 语音质量：基站间切换 (Inter-Freq HO) & SRVCC (Single Radio Voice Call Continuity) * 下行动态调度 (DL Dynamic Scheduling) * 上行动态调度 (UL Dynamic Scheduling) * 半持久调度 (Semi-Persistent Scheduling - SPS) * ROHC (Robust Header Compression) **核心内容：** **CSFB (Circuit Switched Fallback)** 是一种在4G LTE网络中，将语音和短信服务通过GSM或其他电路交换网络传递给LTE设备的技术。这是因为LTE是全IP的纯分组网络，本身无法直接支持电路交换呼叫。当LTE设备需要进行语音通话或接收短信时，它会“回落”到3G或2G网络来完成这些业务。课程将详细介绍CSFB的实现需求、呼叫流程（包括发起和接收）、不同CSFB场景的处理以及相关的配置优化参数。 **VoLTE (Voice over LTE)** 是一种基于LTE高速无线通信标准，用于移动电话和数据终端（包括物联网设备和可穿戴设备）的语音通话技术。VoLTE相较于旧的3G UMTS有高达三倍的语音和数据容量，相比2G GSM更高出六倍。它使用更少的带宽，因为VoLTE的分组报头比未优化的VoIP/LTE报头更小。VoLTE通话通常与普通电话收费相同。要成功使用VoLTE，设备、固件、运营商以及运营商间的连接都必须支持该服务。虽然一些运营商将VoLTE营销为“高清语音”(HD Voice)，但这并非与VoLTE标准等同。此外，EVS (Enhanced Voice Service) 编码技术也用于LTE中的高清+语音。本课程将深入探讨VoLTE的定义、优势、基础知识、高清编码、IMS架构、QCI配置、SIP协议、注册与呼叫流程，UE在连接模式下的行为（如切换），以及语音质量优化相关的调度技术（如动态调度、SPS）和ROHC。 **目标受众：** 本课程适合初学者和在移动通信领域工作的专业人士。 **语言：** 课程讲解使用阿拉伯语，并包含相应的英语术语。
Voice calls Optimization in 4G Networks " CSFB & VOLTE "وبكل التفاصيل العملية والنظريةالكورس فقط يتطلب أن يكون لديك بعرفة بالجيل الرابع لشبكات المحمولويحتوى علىSection 1:IntroductionLecture 1:IntroductionLecture 2:Basic Review about CS and PSLecture 3:Quick Revision About LTE Network ArchitectureLecture 4:4G BearersLecture 5:Introduction to Voice Calls in 4GSection 2: CSFB - Circuit Switching Fall BackLecture 6:CSFB RequirementsLecture 7:CSFB Originated Call StepsLecture 8:Blind, Flash and with Measurements CSFBLecture 9:CSFB Terminated Call StepsLecture 10:CSFB Configuration Optimization ParametersSection 3: VoLTE - Voice over LTELecture 11:What is Volte? and what is its advantages?Lecture 12:Basics RevisionLecture 13:HD Calls Coding in VoLTELecture 14:IMS ArchitectureLecture 15:VoLTE QCIsLecture 16:SIP BasicsLecture 17:Registration FlowLecture 18:Call ScenarioLecture 19:UE Behavior in Connected Mode ( HO )Lecture 20:Voice Quality Inter-Freq HO & SRVCCLecture 21:DL Dynamic SchedulingLecture 22:UL Dynamic SchedulingLecture 24:Semi-Persistent Scheduling ( SPS )Lecture 25:ROHCالدورة للمبتدئين والمحترفين في مجال التصالات النقالةالشرح باللغة العربية مشمول بالمصطلحات الأنجليزيةCircuit Switched FallBack (CSFB) is a technology used in 4G LTE whereby voice and SMS services are delivered to LTE devices through the use of GSM or another circuit-switched network.Circuit Switched FallBack is needed in some networks because LTE is a packet-based all-IP network that cannot support circuit-switched calls. When an LTE device is used to make or receive a voice call or SMS, the device "falls back" to the 3G or 2G network to complete the call or to deliver the SMS text message.While making a voice call may seem simple, largely depends on the scenario where the user is, and alternatives available for its completion. So it is necessary to understand well what are the possibilities and the most important concepts of these key scenarios.Voice over LTE (VoLTE) is an LTE high-speed wireless communication standard for mobile phones and data terminals, including Internet of things (IoT) devices and wearables. VoLTE has up to three times more voice and data capacity than older 3G UMTS and up to six times more than 2G GSM. It uses less bandwidth because VoLTE's packet headers are smaller than those of unoptimized VoIP/LTE. VoLTE calls are usually charged at the same rate as other calls.To be able to make a VoLTE call, the device, its firmware, and the mobile telephone providers on each end, as well as the inter-carrier connectivity must all implement the service in the area, and be able to work together. VoLTE has been marketed as HD Voice by some carriers, but this is not the same as the VoLTE standard. Moreover, HD+ (EVS) is used only in LTE.
