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EMM Procedure 6. Handover without TAU - Part 3. S1 Handover

Table of Contents 1. Introduction 2. Concept of S1 Handover 2.1 S1 Protocol Stacks 2.2 S1AP Procedures and Messages Relating to Handover 2.3 S1 Handover Procedure at a Glance 2.4 UE State and Connection Information Before and After S1 handover 3. Procedure of S1 Handover 4. EPS Entity Information: Before/After S1 Handover 5. Closing 1. Intro...

04/08/2014

141,031

Technical Documents

Fronthaul Size: Calculation of maximum distance between RRH and BBU

In C-RAN (Centralized/Cloud RAN), the more RRHs are covered by one CO (BBU hostelling site), i) the fewer COs are required, and ii) the more BBUs can be centralized at one CO. This allows for the most efficient utilization of BBU resources, thereby significantly reducing CAPEX/OPEX. For this reason, the maximum separation distance between RRH and BBU should be secured. This distance is cons...

04/01/2014

72,179

Tech-Blog

C-RAN Classification (1): Coverage-based

C-RAN Classification (1): Coverage-based 1. City-wide C-RAN: Thousands of RRHs (cell) 2. CO-based C-RAN: Hundreds of RRHs (cell) 3. Master Macro site-based C-RAN: Tens of RRHs (cell) 4. Local C-RAN (C-RAN over D-RAN): A few RRHs (cell)

03/26/2014

27,510

One-Shot Gallery

Required CPRI link capacity in function of radio technologies

03/24/2014

36,567

One-Shot Gallery

EMM Procedure 6. Handover without TAU - Part 2. X2 Handover

Table of Contents 1. Introduction 2. Concept of X2 Handover 2.1 X2 Protocol Stacks 2.2 X2AP Functions 2.3 X2 Messages Relating to Mobility Management Function 2.4 X2 Handover Procedure at a Glance 2.5 UE State and Connection Information Before and After X3 handover 3. Procedure of X2 Handover 4. EPS Entity Information: Before/After X2 Handover 4.1 Before...

03/21/2014

145,335

Technical Documents

Why WDM is essential in C-RAN fronthaul networks? - Ultra high CPRI link capacity

Our question in this post is: Why does the CPRI link between BBU (at CO) and RRH (at Cell Site) in C-RAN require a ultra high Gbps bandwidth? Before you read this post, we advise you to read our previous post, "CPRI (1): Emergence of C-RAN and CPRI overview". The CPRI link capacities required between BBU and RRH in the C-RAN architecture are as follows: Table 1. CPRI data rates...

03/12/2014

68,633

Tech-Blog

EMM Procedure 6. Handover without TAU - Part 1. Overview of LTE Handover

Table of Contents 1. Introduction 2. Overview of LTE Handover 2.1 Measurement 2.2 Handover Decision 2.3 Handover Prodedure 2.4 Handover Interruption Time 2.5 Mobility Robustness Optimization 3. Closing 1. Introduction This document describes the handover procedure defined as EMM Case 6 in our technical document, “Eleven EMM C...

03/06/2014

109,821

Technical Documents

CPRI (1): Emergence of C-RAN/Fronthaul and CPRI overview

Emergence of C-RAN (Separation of Baseband and Radio, and Baseband Centralization) Today, global LTE operators are competing with one another more fiercely than ever, under the pressure to provide better service quality and higher speed. Conventional Internet traffic has been increasing steadily. What's more, mobile traffic resulting from OTT video services, such as YouTube, Mobile IPT...

03/04/2014

81,757

Tech-Blog

EMM Procedure 5. Periodic TAU

Table of Contents 1. Introduction 2. Concept of Periodic TAU 3. Procedure of Periodic TAU 4. EPS Entity Information: Before/After Periodic TAU 4.1 Before Periodic TAU 4.2 After Periodic TAU 5. Closing 1. Introduction This document describes the periodic TAU (Tracking Area Update) procedure defined as EMM Case 5 in our technical document, “...

02/19/2014

123,495

Technical Documents

NTT Docomo’s Advanced C-RAN Architecture

02/10/2014

32,116

One-Shot Gallery

EMM Procedure 4. Service Request

Table of Contents 1. Introduction 2. Cases of Service Request 3. UE-triggered Service Request 4. Network-triggered Service Request 5. EPS Entity Information: Before/After Service Request 6. Closing 1. Introduction This document describes the service request procedure defined as EMM Case 4 in our technical document, “Eleven EMM Cases in an EMM Sce...

02/09/2014

177,128

Technical Documents

SK Telecom: LTE Fronthaul and Backhaul Architecture

Also see this excellent animation produced by SK Telecom (Source: HFR)

02/04/2014

49,960

One-Shot Gallery

EMM Procedure 3. S1 Release

Table of Contents 1. Introduction 2. S1 Release due to User Inactivity 3. EPS Entity Information: Before/After S1 Release 3.1 Before S1 Release 3.2 After S1 Release 4. Closing 1. Introduction This document will describe procedures for releasing S1 connection when a UE becomes inactive, as in EMM Case 3 defined in our technical document, “Eleven...

01/25/2014

133,813

Technical Documents

GSMA RCS Blackbird Overview

Table of Contents 1. Introduction 2. Configuration Provisioning 3. Service Capability Discovery 4. One to One Chat 5. Group Chat 6. File Transfer 7. Geolocation Sharing 8. vCard Exchange 9. Contents Sharing 10. Integrated Messaging 11. IP Voice Call (Voice over Wi-Fi Call) 12. IP Video Call 13. Summary 1. Introductio...

01/22/2014

25,913

Technical Documents

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

31,986

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

188,596

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

471,157

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

45,131

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

217,391

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

99,302

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