Rcs Advanced Course - Chat Sessions A To Z

Detail into Control Signaling, Presence Capability and MSRP transport setup for One to One and Group Chat Sessions

What you'll learn

Understand all the functional bocks as described in GSMA Guidelines that are required to setup a RCS Chat Session

Be able to describe the functions of RCS Client, The Servers Farm that is part of all Session Control and setup of media transport layer

Understand the QOS mechanism built in the media path where the data chunks are are being sent and recieved using MSRP protocol.

Talk about Standalone Messaging as defined in RCS Guidelines which is alternative to Chat Sessions but still able to send messages over IP

Tie together all functional blocks in call flows diagrams to setup 1to1 Chat Session showing how SIP messages setup the MSRP based transport path.

See some alternative scenarios how the Chat Session falls back to Legacy SMS/MMS when some of the RCS pre requirements are not satisfied

Extend the 1to1 Chat Session concepts to understand how a 1toN Group Chat session can be established.

Once a group Chat Session is setup, there can always be requirements to add to or remove members from the group. You will know how it happens.

Requirements

If you want to know everything about how RCS Chat Sessions are established using GSMA Guidelines, this is the course for you.

I would highly recommend that before attending this course, you must go through my Course on "Introduction to RCS" which will build your basic understanding of RCS as defined by GSMA. That will make it easier for you to go through this course.

Description

Ultimate objective of this course is to make the students understand how a chat or group chat session is setup with signaling control flows resulting in the setup of transport path that carry the messages from one subscriber to others who are part of the chat session.   We shall go through following information flow and discuss end to end call flows towards end of the course.Discuss in which scenarios, the RCS client on your phone gets Auto Configured and what particular parameters related to RCS get set on the client to provide you RCS services.As we saw that RCS is completely based on IMS Network, we shall look at all functional elements that are part of IMS architecture. Then we shall see the Call flow diagrams of how RCS client gets registered to IMS network and get associated to the Messaging Application Server. Since RCS sessions are setup between two subscribers only when both support RCS and are IMS Registered, we need to understand what in the network gives us this functionality to check the Capabilities of other subscribers. That is where we shall go in more details of functionality of Presence Server. We shall see both Publication and Retrievals of capabilities of different subscribers.Then we shall see the functions of a Messaging Server and the Message Store that control the logic of these RCS functions.We cannot appreciate the end-to-end call flows for Chat Sessions without seeing how exactly the Messaging Transport Path based on MSRP Protocol is setup. We shall see the functionality of another element here called PCRF (Policy and Charging Rule Functions) that controls the QOS that has to be satisfied for this messaging transport path.Our intent is to always setup end to end RCS connections when two or more subscribers are looking to Chat. But as we discussed in Introduction to RCS course about the Challenges and Obstacles facing RCS adaptation, for quite some time we may not see end to end RCS connectivity. So RCS standards have defined other means of sending the messages between participants if the receiving entity or the network is not supporting RCS. This is where we shall discuss Standalone Messaging  which is  Pager Mode and Large Message Mode which is also giving more real time experience to end users till we see full adaptation of RCS on all handsets.After all this understanding we shall go in detailed Call Flows to setup a 1 to 1 chat session between two subscribers of the same Service Provider.Finally we shall extend the Chat concept to 1 to N Group Chat sessions within Same Service provider networkTo make sure that we keep the course length to an optimum duration, we shall limit the scenarios of Chat Sessions between subscribers of same Service Providers.  If we add subscribers of different service providers, it adds another level of complexity that will be the topic of another advanced course solely Dedicated to “RCS Interoperability using NNI”. Stay tuned for that.

Overview

Section 1: Introduction

Lecture 1 Introduction

Lecture 2 RCS Chat Session Learning Objectives

Section 2: RCS Client Configuration

Lecture 3 Functions of RCS Client

Lecture 4 Configuring the RCS Client

Section 3: IMS Registration Architecture and call flows

Lecture 5 IMS Registration Architecture

Lecture 6 Selection of Messaging Server

Lecture 7 IMS Registration Call Flows

Section 4: All About Presence Server's role in RCS.

Lecture 8 Presence Server Architecture

Lecture 9 How do we publish the capabilities

Lecture 10 Publishing Examples

Lecture 11 Presence Retrieval

Lecture 12 SUBSCRIBE NOTIFY Examples

Lecture 13 More Presence RFCs

Lecture 14 Resource List Server

Section 5: Messaging Server and Message Store

Lecture 15 Functions of Messaging Server

Lecture 16 Functions of Message Store

Section 6: Setting up MSRP Dedicated bearer

Lecture 17 Key features of MSRP

Lecture 18 Role of PCRF to take care of QOS requirements for the bearer path

Lecture 19 Setting up Dedicated Bearer

Section 7: RCS Standalone Messaging

Lecture 20 What is Standalone Messaging as defined by RCS guidelines?

Lecture 21 Pager Mode of Messaging

Lecture 22 Large Message Mode

Section 8: 1 to 1 Chat Session Setup

Lecture 23 Successful 1 to 1 Chat session setup

Lecture 24 1 to 1 Chat session Falling back for Non-RCS recipient

Lecture 25 1 to 1 chat session when sending of MSRP packets fail

Section 9: Group Chat Session Setup

Lecture 26 Setting up a Group Chat Session

Lecture 27 Adding new member in the existing group chat session

Lecture 28 Removal of an existing member from the group chat session

Section 10: Summary and Conclusions

Lecture 29 Summary of what we have learnt

Lecture 30 Conclusions

If you are dealing in 4G and 5G technology projects, it is highly possible that you will need to know how the text and file transfers are taking place between various subscribers using messaging technology.,If you are involved in an RCS project in an engineering or project management role, you will definitely want to have more insight on how RCS technology and in particular how Chat Sessions work. This course will give you that insight.