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Evolution of GSMA RCS standards

Table of Contents 1. Introduction 2. The advent of IP Messaging Service and evolution towards Converged IP 3. OTT vs Operators 4. Joyn 5. Adoption of CPM architecture in RCS 6. RCS r4 and RCSe merged into RCS r5.x 7. SIMPLE IM 2.0 8. CPM 2.0 9. RCS blackbird 10. Summary 1. Introduction When the GSM Association (GSMA) has specified th...

01/21/2014

32,596

Technical Documents

EMM Procedure 2. Detach

Table of Contents 1. Introduction 2. Cases of Detach 3. UE-initiated Detach 4. MME-initiated Detach 5. HSS-initiated Detach 6. EPS Entity Information: Before/After Detach 7. Closing 1. Introduction This document discusses detach procedures defined as EMM Case 2 in our previous document, “Eleven EMM Cases in an EMM Scenario”[1]. During th...

01/21/2014

190,140

Technical Documents

EMM Procedure 1. Initial Attach - Part 2. Call Flow of Initial Attach

Table of Contents 1. Introduction 2. Initial Attach Procedure 2.1 IMSI Acquisition 2.2 Authentication 2.3 NAS Security Setup 2.4 Location Update 2.5 EPS Session Establishment 3. EPS Entity Information 3.1 Before Initial Attach 3.2 After Initial Attach 4. Closing 1. Introduction N...

01/16/2014

474,659

Technical Documents

GSMA RCS Architecture

Table of Contents 1. Introduction 2. SIMPLE IM Architecture 3. CPM Architecture 4. RCS Architecture 5. Summary 1. Introduction GSMA Rich Communication Suite (RCS) was originally based on OMA SIMPLE IM architecture in the beginning, but adopted OMA Converged IP Messaging (CPM) architecture from RCS r4.0. While the RCS r4.0 was updated to RCS r5.0 and onwa...

01/15/2014

46,045

Technical Documents

EMM Procedure 1. Initial Attach - Part 1. Cases of Initial Attach

Table of Contents 1. Introduction 2. Cases of Initial Attach 2.1 Unknown UE 2.2 Known UE 3. Simplified Call Flow in Each Case 4. Closing 1. Introduction This document discusses initial attach, as defined as EMM Case 1 in our previous document, “Eleven EMM Cases in an EMM Scenario” [1]. During this phase, a user turns on hi...

12/26/2013

219,110

Technical Documents

LTE in Korea 2013

Table of Content 1. Korea, the Most advanced LTE Market in the World 2. LTE deployment status by operator in Korea (SK Telecom, KT, LG U+) 3. LTE frequency commercialization status in Korea 4. LTE services: Mobile broadband, Mobile IPTV and VoLTE 5. LTE equipements deployed in Korea 6. LTE devices 7. LTE patents 1. Korea, the Most Advanced LT...

12/04/2013

101,067

Reports

LTE Frequency commercialization status in Korea (Nov. 2013)

12/02/2013

50,991

One-Shot Gallery

Do Google Global Caches (GGCs) serve YouTube live traffic as well, or not?

Google Global Caches (GGCs) have already been deployed in many telecom operators' data centers around the world, caching YouTube video files like Psy's Gangnam Style for the local users. This allows people around the globe to watch Psy singing and dancing without buffering through their local GGCs. Korean operators like SK Telecom, LG U+ and KINX have also made the same move in February...

11/20/2013

97,777

Tech-Blog

NAT Behavior Discovery Using STUN (RFC 5780)

Our previous document described the NAT behavior discovery algorithms defined in RFC 3489. This document will explain what algorithms for discovering NAT behaviors are defined in RFC 5780. Again, to fully understand what's discussed below, we recommend you read the following posts first: 1. NAT Behavioral Requirements, as Defined by the IETF (RFC 4787) - Part 1. Mapping Behavior 2....

11/18/2013

42,348

Technical Documents

IP/MPLS vs. MPLS-TP: Control Plane

11/11/2013

35,728

One-Shot Gallery

Understanding DHCP Proxy Agents and Security

Table of Contents I. Overview II. Introduction to DHCP Proxy Agents III. Basic Operations of DHCP Proxy Agents IV. Security Functios of DHCP Proxy Agents V. Summary and Closing Appendix A - Format of DHCP Messages in IP Address Allocation/Lease Procedure Appendix B - Format of DHCP Messages in IP Address Renewal Procedure Appendix C - Format of DHC...

11/07/2013

66,128

Technical Documents

Understanding DHCP Relay Agents

Table of Contents I. Overview II. Why are DHCP Relay Agents Needed in DHCP Operations ? III. Basic Operation of DHCP Relay Agents Appendix - Format of DHCP Messages in a Network with DHCP Relay Agents I. Overview This document provides a technical understanding of a DHCP relay agent that is required in a multi-subnet environment where a DHCP client...

11/05/2013

221,503

Technical Documents

NAT Behavior Discovery Using Classic STUN (RFC 3489)

Let us introduce the NAT behavior discovery algorithms defined in RFC 3489. To fully understand what's discussed below, we recommend you read the following posts first: 1. NAT Behavioral Requirements, as Defined by the IETF (RFC 4787) - Part 1. Mapping Behavior 2. NAT Behavioral Requirements, as Defined by the IETF (RFC 4787) - Part 2. Filtering Behavior 3. STUN (RFC 3489) vs. STUN (R...

11/04/2013

49,232

Technical Documents

What is DHCP Option 82?

We will look into DHCP Option 82 used in the wireline networks of network operators today. Most of you are probably subscribing to a wireline Internet service provided by one of the network operators such as KT, SK Telecom or LGU+ (Korean Operators). When users subscribe to the Internet service, they pay a monthly fee to their network operator for using the Internet service. So, as a genera...

11/01/2013

58,881

Tech-Blog

YouTube's Live TV Streaming in Mobile Devices - HLS & Adaptive

This post will analyze the streaming methods used in YouTube's Live TV streaming services for mobile devices in an LTE network and a Wi-Fi network based on our actual measurements. YouTube's Live TV Streaming in Mobile Devices: HLS & Adaptive First, measurements in an LTE network The mobile device and network used for our measurement were Galaxy S4 and KT LTE network. First,...

10/30/2013

88,828

Tech-Blog

Understanding the Detailed Operations of DHCP

Table of Contents I. Introduction II. Procedures for Detecting IP Address Conflicts III. DHCP Offer/ACK Messages: Broadcast or Unicast ? IV. State Transition of DHCP Clients I. Overview Dynamic Host Configuration Protocol (DHCP) has been widely adopted as a protocol for allocating network configuration data, including an IP address, dynamically to...

10/30/2013

90,242

Technical Documents

LTE QoS (Part 3) - P2P Traffic BW Control using the LTE QoS

In the last two posts (Part 1, Part 2), we learned about LTE QoS. Now, we will show you an example of controlling P2P traffic using the LTE QoS in the LTE network. Let's say there is a network operator named "NMC Telecom", and it offers a service plan with the following features: No bandwidth limitation for Internet usage Data rate limitation (512 Kbps for download, and 128 Kbps fo...

10/25/2013

62,061

Tech-Blog

Understanding the Basic Operations of DHCP

Table of Contents I. Introduction II. IP Address Allocation/Lease Procedure III. IP Address Renewal Procedure IV. IP Address Release Procedure V. Summary VI. Closing Appendix A - Format of DHCP Messages in IP Address Allocation/Lease Procedure Appendix B - Format of DHCP Messages in IP Address Renewal Procedure Appendix C - Format of DHCP Me...

10/23/2013

413,448

Technical Documents

Eleven EMM Cases in an EMM Scenario (Presentation version)

10/22/2013

26,541

Technical Documents

Eleven EMM Cases in an EMM Scenario

Table of Contents 1. Introduction 2. EPS Mobility Management (EMM) Scenario 3. Closing 1. Introduction This document and its subsequent documents will provide descriptions of specific EMM procedures based on our understanding of EMM and ECM/RRC states covered in our LTE technical document, “LTE EMM and ECM States” [1]. EMM features are explained in...

10/22/2013

97,349

Technical Documents

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