Career Presentation (Chris Changmo Yoo), Dec. 2017

1. NMC Consulting Group January 2005 ~ Present
WIND RIVER SYSTEMS April 2004 ~ January 2005
CORECESS May 2000 ~ April 2004
DAEWOO IAE March 1997 ~ May 2000
December 2017
Chris Changmo Yoo
changmo.yoo@gmail.com
+82-10-3229-1852
CAREER PRESENTATION

2. Career Highlights (20 Years+)
1997
DAEWOO IAE
Consultant
• Long Term Evolution (LTE) and eMBMS
• IPTV & Triple Play Service (TPS)
• IP/MPLS, Carrier Ethernet
• Wi-Fi
• CDN
Global Project Experience
• LTE Broadcast (eMBMS), Jio, India (2013 ~ 2017)
• LTE and Wi-Fi Interworking, YTL, Malaysia (2011)
• IP Transport Network, Yota, Peru (2011)
• LTE, Yota, Russia (2010)
• Mobile WiMAX, Mobily, Saudi Arabia (2009)
• Mobile IP Backhaul, KDDI, Japan (2007)
• IPTV, KT, Korea (2006)
• TPS, Tele2-Versatel, Netherlands (2005)
2000
CORECESS
2004
WIND RIVER
SYSTEMS
2005
NMC Consulting Group (Netmanias)
Present
Software
Engineer
• ADSL Router
• ATM LAN
Switch
Software
Engineer
• Metro
Ethernet
Switch (IBM
Network
Processor)
• IP-DSLAM
• Ethernet
Switch
Presales
Engineer
• VxWorks
• Tornado
• Workbench
• Manage
Distributor
& Reseller
1

3. Technical History
1997 1998 1999 2000 2001 20112002 2003 2004 2005 2006 2007 2008 2009 2010 2012 2013 2014 2015 2016 2017
Software Engineering
• Real-Time OS, Linux, Device Driver
• C, C++, Assembler
• Intel CPU, PowerPC
Network Engineering
• Ethernet/IP, ATM
• QoS
• Network Processor
• Switch/Router, DSLAM
Presales Engineering
• Wind River Software Solution
Network Consulting/Professional Service
• Long Term Evolution (LTE)
• LTE-Broadcast (eMBMS)
• Content Delivery Network (CDN)
• IPTV/Triple Play Service (TPS)
• IP/MPLS, Carrier Ethernet
• Wi-Fi
• Mobile WiMAX
2

4. Professional Service Experience at NMC Consulting Group (Netmanias)
Year Project Client Service Provider
2013 ~ 17 Design & PoC of LTE-Broadcast (eMBMS) network and service (including MooD) Samsung Electronics,
Network Division
Jio, India
2011 Design of Mobile WiMAX/LTE and Wi-Fi interworking network Samsung Electronics,
Network Division
YTL, Malaysia
2011 Design of IP/MPLS transport network for Mobile WiMAX service Samsung Electronics,
Network Division
Yota, Peru
2010 Design of Samsung Mobile WiMAX solution for presales Samsung Electronics,
Network Division
Bharti Airtel, India
2009 Design & PoC of Mobile WiMAX network and service Samsung Electronics,
Network Division
Mobily, Saudi Arabia
2008 Design of Mobile WiMAX network and service Samsung Electronics,
Network Division
Yota, Russia
2007 ~ 08 Design of mobile backhaul for 1xEV-DO Rev. A Samsung Electronics,
Network Division
KDDI, Japan
2006 Design of Triple Play Service (TPS) network and service Samsung Electronics,
Network Division
H1, Croatia
2005 Design & PoC of Triple Play Service (TPS) network and service Samsung Electronics,
Network Division
Tele2-Versatel, Netherlands
3

5. Consulting Service Experience at NMC Consulting Group (Netmanias)
Year Project Client Service Provider
2016 Design of MP-TCP based LTE and Wi-Fi aggregation solution Netvision Telecom Jio, India
2012 NAT analysis of Korean operator’s 3G/LTE and Wi-Fi network Samsung Electronics,
Mobile Division
-
2012 Technical comparison of Content Centric Network (CCN) vs. Content Delivery
Network (CDN)
Samsung Advanced
Institute of Technology
-
2011 Study on smart node development and commercialization strategy ETRI -
2011 KT Home Hub (Home Wi-Fi AP) service quality improvement KT -
2010 Samsung LTE solution design Samsung Electronics,
Network Division
Yota, Russia
2009 A study on the feasibility analysis for Mobile WiMAX service in South Africa KISA -
2008 A consulting on ETRI Packet Optical Transport System (POTS) specification ETRI -
2007 Samsung Mobile WiMAX/NGN/TPS solution design Samsung Electronics,
Network Division
-
2006 Design of new IPTV service framework architecture & service logic KT -
2006 Design of Samsung TPS framework for strengthening of marketing Samsung Electronics,
Network Division
-
4

6. Global Project Experience
Yota
IP Network Project (2011)
Mobily
Mobile WiMAX Project (2009)
Yota
Mobile WiMAX Project (2008)
Tele2-Versatel
TPS Project (2005)
ITU-T World Forum
IPTV Solution Project (2006)
Netherlands
Russia
Peru
Saudi Arabia Hong Kong
India
Jio (RJIL)
LTE-Broadcast Project (2013 ~ 2017)
Malaysia YTL
LTE & Wi-Fi Interworking Project
(2011)
5

7. LTE-Broadcast (eMBMS) Network and Service in Jio (RJIL), India
MooD Service Call Flow
Workshop: Presentation of High Level DesignLTE-B (eMBMS) Network Reference Model
Project Summary
• Customer: Samsung Electronics
• Term: January 2013 ~ October 2017
• Service Provider: Jio (RJIL), India
• Target Service: Live video streaming
and content pre-positioning on UE
based on LTE-Broadcast technology
Work Experience
• Technical leader
• High & low level design of eMBMS
network and service
• User service and device
• Network reference model
• Service provisioning & service discovery
• DASH streaming service including MooD
• Filecast service
• Carousel service
• Mobility & multiple PLMN
• Functional design of BM-SC system
• Proof of Concept (PoC) of E2E network
& service
Deliverables
• Customer Requirement Doc. (CRD)
• High Level Design (HLD)
• Low Level Design (LLD)
• IOT & System Integration Test
Procedure (SIT)LTE-B (eMBMS) Service Provisioning Specification
Project in NMC Consulting Group (Netmanias) during 2013 ~ 2017
6

8. MP-TCP based LTE and Wi-Fi Aggregation
MPTCP E2E Service Call Flow
MPTCP Session Mapping between UE and GWMPTCP Network Reference Model
Project Summary
• Customer: Netvision Telecom
• Term: January 2016 ~ May 2016
Work Experience
• Technical leader
• Solution design of MPTCP system
• MPTCP GW overview
• MPTCP GW system description
• MPTCP GW feature description
- IP address conversion
- UE authentication & policy provisioning
- MP-GW selection logic
- Statistics reporting
- MPTCP GW security
- Lawful interception
- MPTCP UE
• System redundancy
• OAM
Deliverables
• MPTCP GW Solution Design
MPTCP UE Internal Architecture
Project in NMC Consulting Group (Netmanias) at 2016
7

9. NAT Analysis of Korean Operator’s 3G/LTE and Wi-Fi Network
Analysis of NAT Type (STUN)
UDP Hole Punching Success Ratio in Wi-Fi NetworkUDP Hole Punching Success Ratio in 3G/LTE Network
Project Summary
• Customer: Samsung Electronics
• Term: May 2012 ~ August 2012
Work Experience
• Technical leader
• Analysis of NAT type (3G/4G CG-NAT
and Wi-Fi AP) in Korean operators (SK
Telecom, KT, LG U+) based on field-
testing
Deliverables
• Test Procedure for NAT Behavior
Discovery
• Test Result for NAT Behavior
Characteristic
• Statistics of UDP Hole Punching
Success Ratio in 3G/LTE and Wi-Fi
Network
• Analysis on STUN Protocol
• 3G/LTE Network Deployment in Korean
Operators (SK Telecom, KT, LG U+)
Optimized Method to P2P Delivery
Project in NMC Consulting Group (Netmanias) at 2012
8

10. Smart Node Development and Commercialization Strategy
Akamai WAA (Web Application Accelerator)
Akamai Route Optimization: SureRouteAkamai Route Optimization: Dynamic Mapping
Project Summary
• Customer: ETRI
• Term: November 2011 ~ January 2012
Work Experience
• Analysis of Akamai Cloud optimization
solution which includes Dynamic
mapping, SureRoute, Persistent
connection, Packet redundancy, TCP
optimization, data redundancy, HTTP
prefetching & pipelining features
• Analysis of Riverbed WAN optimization
solution which includes TCP proxy, TCP
& HTTP optimization and data de-
duplication features
Deliverables
• Akamai Cloud Optimization Technology
and Service Analysis
• Riverbed WAN Optimization Solution
Analysis
Akamai/Riverbed SCA (Steelhead Cloud Accelerator)
Project in NMC Consulting Group (Netmanias) at 2011
9

11. KT Home Hub (Home Wi-Fi AP) Service Quality Improvement
Wi-Fi Performance Test Result Comparion
Wi-Fi Field TestWi-Fi Test Configuration
Project Summary
• Customer: KT
• Term: November 2011 ~ January 2012
Work Experience
• Technical leader
• Wi-Fi performance and quality test
• Test Environment: KT Ilsan RF shield room
• DUT: KT Home Hub 3 model , KT Home Hub
Special 1 model, ipTIME N8004, Cisco E4200
• Test Tool: IxChariot, OmniPeek and test script
Deliverables
• Report of KT Home Hub Benchmarking
Test
Wi-Fi Performance Test Result (IxChariot)
Project in NMC Consulting Group (Netmanias) at 2011
10

12. IP Transport Network for Mobile WiMAX Service in Yota, Peru
MPLS VPN Architecture
Workshop: Presentation of High Level DesignEnd to End IP Transport Network
Project Summary
• Customer: Samsung Electronics
• Term: December 2010 ~ March 2011
• Service Provider: Yota, Peru
• Target Service: High speed Internet
access based on Mobile WiMAX
technology
Work Experience
• Technical leader
• High level design of IP transport
network
• IP routing & policy
• MPLS VPN
• Redundancy, QoS and security
• IP connectivity (ASN, CSN, B/OSS, NMS/EMS)
• NAT & ACE redundancy
• IP addressing
• MEN based WiMAX backhaul (Telefonica &
Global Crossing)
• Field acceptance test
• WiMAX service assurance test
Deliverables
• High Level Design (HLD)
• Field Acceptance Test (FAT) Procedure
Field Acceptance Test Case
Project in NMC Consulting Group (Netmanias) at 2011
11

13. Samsung LTE Solution Design for Presales
X2 based Handover Procedure
Samsung LTE QoS Concept (for Yota Russia)LTE Network Reference Model (NRM)
Project Summary
• Customer: Samsung Electronics
• Term: September 2010 ~ December
2010
Work Experience
• Technical leader
• High level design of Samsung EPC
• LTE identification and naming
• LTE bearer and QoS concept
• EPS mobility management and connection
management states
• EMM (EPS Mobility Management) procedure
• PCC (Policy and Charging Control) & ESM (EPS
Session Management)
• Order management (activation, suspension,
resumption, termination, lost device)
• Charging
• Security, E2E QoS
• High level design of WiMAX - 2G/3G
interworking
• CMIP CCoA
• CMIP CoA
• PMIP
Deliverables
• High Level Design of Yota E2E LTE
Network
• High Level Design of WiMAX – 2G/3G
InterworkingWiMAX – 2G/3G Interworking: 4 Alternatives
Project in NMC Consulting Group (Netmanias) at 2010
12

14. Samsung Mobile WiMAX Solution Design for Presales
Security Concept: MPLS VPN & Firewall
Scope of Samsung SI Service for WiMAXQuestionnaire for WiMAX Solution Analysis Service
Project Summary
• Customer: Samsung Electronics
• Term: February 2010 ~ August 2010
Work Experience
• Technical leader
• Presentation to Bharti Airtel in India
• Standard questionnaire for Mobile
WiMAX solution analysis
• Preliminary design of IP network for
Mobile WiMAX
Deliverables
• Questionnaire for WiMAX Solution
Analysis Service (268 questions)
• Proposal for Samsung Mobile WiMAX SI
Service
• Preliminary Design of E2E IP Transport
Network for Samsung Mobile WiMAX
Ecosystem
• Bharti Airtel WiMAX Network – IP
Backhaul Redundancy
• TCL (TATA) WiMAX Service – Dynamic
Bandwidth Control & Billing Policy
• ChinaComm WiMAX Service – Wi-Fi
Hotspot Architecture
Airtel Backhaul Network Redundancy Architecture
Project in NMC Consulting Group (Netmanias) at 2010
13

15. Mobile WiMAX Service in Mobily, Saudi Arabia
Online SubscriptionUse Case
Workshop: Presentation of High Level DesignWiMAX Network Reference Model (NRM)
Project Summary
• Customer: Samsung Electronics
• Term: May 2009 ~ December 2009
• Service Provider: Mobily, Saudi Arabia
• Target Service: High speed Internet
access based on Mobile WiMAX
technology for retail, wholesale and IP-
VPN service
Work Experience
• Technical leader
• High level design of business use cases
• Order management (activation, profile
change, suspend, resumption, etc)
• Authentication
• IP allocation (simple IP, mobile IP)
• Prepaid & postpaid charging
• Policy enforcement (bandwidth on demand)
• CPE management (OMA-DM)
• Wholesale & IP-VPN
• System Integration Test (SIT) & Field
Acceptance Test (FAT) of business use
case
Deliverables
• High Level Design (HLD) of Mobily
Business Use Cases
• SIT Procedure & Report
• FAT Procedure & Report
Prepaid-Time with FUP (Fair Usage Policy)
Service Case
Project in NMC Consulting Group (Netmanias) at 2009
14

16. ETRI POTS (Packet Optical Transport System) Specification
TPS Backhaul using PBT
POTS Feature ListTrend of IP Transport Network
Project Summary
• Customer: ETRI
• Term: August 2008 ~ December 2008
Work Experience
• Survey on trend of service provider
• Survey on technical trend of Cisco, ALU
and NSN
• IP/MPLS architecture
• Connectivity & reliability for residential TPS &
enterprise service
• OAM
• ETRI POTS based network architecture
• Connectivity model & traffic flow
• Dual-homed PBT
• Issue on multiple failure
• E-LAN service
• Multicast service
• End-to-End OAM
• Economic analysis of Carrier Ethernet
network
Deliverables
• A Study on Technical Specification of
ETRI POTS
Comparison of PBB, PBB+PSLB and PBT based VPLS
Project in NMC Consulting Group (Netmanias) at 2008
15

17. Mobile WiMAX Network and Service in Yota, Russia
WiMAX Network Reference ModelEnd to End WiMAX Network
Project Summary
• Customer: Samsung Electronics
• Term: May 2008 ~ December 2008
• Service Provider: Yota, Russia
• Target Service: High speed Internet
access based on Mobile WiMAX
technology
Work Experience
• Presentation of system integration
service to Yota CEO (Dennis) in Russia
• Proposal of SI service & SOW to Yota
• Customer requirement analysis
• Design: concept design & detailed design
• Proof of Concept (PoC): IOT, NIT and SIT
• Field implementation: FIT and FAT
• Operational support
• Milestone
• Organization of system integration
• Concept design of WiMAX service
• Service description
• E2E Mobile WiMAX network architecture
• Subscription and provisioning process
Deliverables
• Yota SI SOW (Scope Of Work)
• Concept Design
• E2E Mobile WiMAX Network Diagram
System Integration Process
Project in NMC Consulting Group (Netmanias) at 2008
16

18. Mobile Backhaul for Japan KDDI 1xEV-DO Rev. A
Issue Summary of Test Result
KDDI 1xEV-DO Rev. A Backhaul Network
Project Summary
• Customer: Samsung Electronics
• Term: December 2006 ~ June 2008
Work Experience
• Technical leader
• Audit of KDDI IP backhaul & Samsung
system
• Proposal of advanced KDDI IP backhaul
network architecture
• Test of Samsung NE function,
performance and stability
• Analysis of Samsung NE software
architecture
• Standard test procedure (conformance
test)
• Training of IP network for Samsung
Deliverables
• Network Audit Report
• NE Test Report (50+ documents)
• Protocol Test (OSPF, BGP, PIM-SM, IGMP,
VRRP)
• Redundancy Test (Link & Node Failure)
• Throughput Test
• Training Materials (OSPF, VRRP, BGP,
Multicast, SmartBits/TRT, KDDI Network
Architecture)
Training Materials – BGP Convergence
Project in NMC Consulting Group (Netmanias) at 2007
Test Lab Diagram
17

19. Samsung TPS Framework for Strengthening of Marketing
IPTV Demo Lab
Exhibition of Samsung IPTV Solution in ITU-T World
Form 2006, Hong KongSamsung IPTV Solution Architecture
Project Summary
• Customer: Samsung Electronics
• Term: May 2006 ~ August 2006
Work Experience
• Technical leader
• Participation of ITU-T World Forum
2006 for Samsung IPTV solution
• Development of service logic for
Samsung IPTV solution
• Live TV with fast channel zapping (>500ms)
• Start-Over TV with personalized advertising
• Network based PVR (Personal Video Recorder)
• IP based TV rating
• IPTV quality monitoring
• Design of Samsung TPS network &
solution architecture
• TPS environment analysis
• Samsung TPS network architecture: resilient
and scalable E2E TPS network
• Samsung IPTV service solution: quality and
service differentiation
• Samsung TPS ecosystem
Deliverables
• Design of Samsung IPTV Network
Architecture & Solution Development
Service Logic of Personalized Advertising
Project in NMC Consulting Group (Netmanias) at 2006
18

20. KT IPTV Service Framework & Service Logic
Community TV
Family TVFriends TV
Project Summary
• Customer: KT
• Term: May 2006 ~ October 2006
Work Experience
• Design of new IPTV application service
(TV Café Service)
• Friends TV
• Family TV
• Community TV
• Personal TV
• Brand TV
• Camera TV
• Design of TV Café framework
Architecture
• Friends TV
• Family TV
• Community TV
• Personal TV
• Brand TV
• Camera TV
Deliverables
• Design of New IPTV Application &
Framework
Brand TV
Project in NMC Consulting Group (Netmanias) at 2006
19

21. Triple Play Service (TPS) Network and Service in
Tele2-Verstal, Netherlands
Test Methods to find packet drop in IPTV service
Article on Netherlands NewspaperEnd to End TPS Network
Project Summary
• Customer: Samsung Electronics
• Term: January 2005 ~ December 2005
• Service Provider: Tele2-Versatel,
Netherlands
• Target Service: Triple Play Service
(Internet, IPTV and VoIP) based on
ADSL2+ technology
Work Experience
• Technical leader
• High level design of TPS architecture
• Authentication
• Security & user isolation
• Multicast
• QoS
• Interoperability Test (IOT) and Field
Integration Test (FIT)
• Functional and performance test
• Authentication, security and service test
• Service troubleshooting
• Knowledge transfer to Tele2-Versatel
Deliverables
• Design of TPS Architecture
• IOT Procedure & Report
• FIT Procedure & Report
Thanks Mail from Tele2-Versatel Manager
Project in NMC Consulting Group (Netmanias) at 2005
20

22. Field Application Engineer/Presales Engineer
Presentation on WindRiver Road show (2004. 11)
Presentation about Wind River Workbench (2004. 12)
Work Experience
• Field Application Engineer (FAE) /
Presale Engineer
• Lead all the technical aspects of the
sales process, supporting the account
manager
• Educate and make a presentation of the
Wind River Solution (VxWorks, Tornado,
Workbench, etc) to the customers
• Manage and support presales
engineers in distributor and reseller
(Acetronix, NLtelecom and U&I)
• Major Customers
• POSDATA
• ETRI
• HYUNDAI Autonet
Presentation about WIND VIEW (2004. 6)
Project in WIND RIVER SYSTEMS at 2004
21

23. Software Engineer
QoS Architecture of IP-DSLAM
System Architecture of Metro Ethernet Switch
IP Forwarding Design of
Next Generation Product Platform (NGPP)
Next Generation Product Platform
• Term: September 2003 ~ April 2004
• Technical leader
• Design of common switch/router
platform
• Analysis of network processor feature:
Agere, SwitchCore, Marvel, Broadcom
Metro Ethernet Switch
• Term: March 2002 ~ September 2003
• Development of microcode & device
driver in IBM network processor
(NP4GS3C)
• Co-work with IBM engineers in USA for
debugging of microcode
• L2 switching, IP routing, MPLS
forwarding and QoS feature
IP-DSLAM
• Term: July 2003 ~ September 2003
• Development of IP QoS function
(classification, policing, shaping,
queuing and marking)
Ethernet Switch
• Term: May 2000 ~ March 2002
• Development of software based IP
forwarding cache engineHardware Block Diagram of Ethernet Switch
Project in CORECESS during 2000 ~ 2004
22
IBM NP Wintegra
Gigabitetherent
Gigabitetherent
DSL
DSL
Backplane
Backplane
Filtering
(Permit or Deny)
Packet Redirection
(for IPSec)
MFC : Multi Field
(Packet) Classifier
Policer
(Rate-Limiting)
Packet QoS
Remarker
Scheduler
(Shaping, WFQ,
SPQ)
CoS(802.1p)
Classifier
Scheduler
(SPQ, WFQ)
MFC : Multi Field
(Packet) Classifier
Policer
(Rate-Limiting)
Packet QoS
Remarker
Filtering
(Permit or Deny)
Packet Redirection
(for IPSec)
Scheduler
(Shaping, WFQ,
SPQ)

24. Software Engineer
Block Diagram of Ethernet-to-ATM Adaption System
CLI (Command Line Interface) in ADSL RouterProtocol Architecture of ADSL Router
ADSL Router
• Term: March 1999 ~ May 2000
• Port VxWorks (BSP & OS) to MPC860
system
• Development of ADSL modem (TI)
driver
• Development of ATM SAR driver and
ATM signaling protocol (H&J code)
• Port various RTOS/Boot Loader to
MPC860: VxWorks, Linux, RTEMS, FREE
and PPCBoot
ATM LAN Switch
• Term: March 1997 ~ March 1999
• Development of device driver for
Ethernet-to-ATM adaption system
• Development of IPC (Inter Process
Communication) protocol in the VRTX
RTOS environment
IPC Architecture of ATM LAN Switch
Project in DAEWOO IAE during 1997 ~ 2000
23

25. Publication: LTE
Title Doc. Type Technology Language
1 LTE Network Architecture: Basic (co-author, login required) Whitepaper LTE Korean
2 LTE Identification I: UE (User Equipment) and ME (Mobile Equipment) Identifier (co-author,
login required)
Whitepaper LTE Korean
3 LTE Identification II: NE (Network Equipment) and Location Identifier (co-author, login required) Whitepaper LTE Korean
4 LTE Identification III: EPS Bearer Identifier (co-author, login required) Whitepaper LTE Korean
5 LTE Security I: Security Concept & LTE Authentication (co-author, login required) Whitepaper LTE Korean
6 LTE Security II: NAS and AS Security (co-author, login required) Whitepaper LTE Korean
7 LTE QoS: SDF & EPS Bearer QoS (co-author, login required) Whitepaper LTE Korean
8 LTE EMM and ECM State (co-author, login required) Whitepaper LTE Korean
9 LTE: User Experience based EMM Scenario and Eleven EMM Cases (co-author) Whitepaper LTE Korean
10 LTE EMM Procedure: 1. Initial Attach for Unknown UE (Part 1) - Case of Initial Attach (co-
author, login required)
Whitepaper LTE Korean
11 LTE EMM Procedure: 1. Initial Attach for Unknown UE (Part 2) - Call Flow of Initial Attach (co-
author, login required)
Whitepaper LTE Korean
12 LTE EMM Procedure: 2. Detach (co-author, login required) Whitepaper LTE Korean
13 LTE EMM Procedure: 3. S1 Release (co-author, login required) Whitepaper LTE Korean
14 LTE EMM Procedure: 4. Service Request (co-author, login required) Whitepaper LTE Korean
15 LTE EMM Procedure: 5. Periodic TAU (co-author, login required) Whitepaper LTE Korean
24

26. Publication: LTE (cont)
Title Doc. Type Technology Language
16 LTE EMM Procedure: 6. Handover without TAU (Part 1) - Overview of LTE Handover (co-author) Whitepaper LTE Korean
17 LTE EMM Procedure: 6. Handover without TAU (Part 2) - X2 Handover (co-author, login
required)
Whitepaper LTE Korean
18 LTE EMM Procedure: 6. Handover without TAU (Part 3) - S1 Handover (co-author, login
required)
Whitepaper LTE Korean
19 LTE EMM Procedure: 7. Cell Reselection without TAU (co-author, login required) Whitepaper LTE Korean
20 LTE EMM Procedure: 8/9. Handover/Cell Reselection with TAU (co-author, login required) Whitepaper LTE Korean
21 LTE EMM Procedure: 10/11. Toward Another City (co-author, login required) Whitepaper LTE Korean
22 LTE Policy and Charging Control (PCC) (co-author, login required) Whitepaper LTE Korean
23 LTE Charging: Offline (co-author, login required) Whitepaper LTE Korean
24 IP Address Allocation Schemes I: Basic (co-author, login required) Whitepaper LTE Korean
25 IP Address Allocation Schemes II: A Case of Two Cities (co-author, login required) Whitepaper LTE Korean
26 LTE Network Architecture (Network Reference Model) Tech -Blog LTE Korean
27 LTE GTP Tunnel I Tech -Blog LTE Korean
28 LTE GTP Tunnel II Tech -Blog LTE Korean
29 LTE: Tracking Area (TA) and Tracking Area Update (TAU) Tech -Blog LTE Korean
30 LTE: User Identifiers - IMSI and GUTI Tech -Blog LTE Korean
31 LTE: Authentication(EPS-AKA) and Security Tech -Blog LTE Korean
25

27. Publication: LTE (cont)
Title Doc. Type Technology Language
32 LTE Initial Attach Procedure Tech -Blog LTE Korean
33 LTE QoS (Part 1) - EPS Bearer and SDF Tech -Blog LTE Korean
34 LTE QoS (Part 2) - LTE QoS Parameter (QCI, ARP, GBR, MBR, etc) Tech -Blog LTE Korean
35 LTE QoS (Part 3) - P2P Traffic Bandwidth Control using the LTE QoS Tech -Blog LTE Korean
36 A variety of user experience in LTE network Tech -Blog LTE Korean
37 LTE X2 based Handover & S1 based Handover Tech -Blog LTE Korean
38 LTE X2 based Handover & S1 based Handover One-Shot LTE English
39 LTE X2 based Handover Tech -Blog LTE Korean
40 LTE S1 based Handover Tech -Blog LTE Korean
41 LTE: UE IP Allocation Procedure - Dynamic IP Address Tech -Blog LTE Korean
42 LTE: UE IP Allocation Procedure - Static/Fixed IP Address Tech -Blog LTE Korean
43 The reason why tunneling is required for user mobility (Part 1) Tech -Blog LTE Korean
44 Tunneling Protocol of LTE, WiMAX and Wi-Fi (Part 2) Tech -Blog LTE Korean
45 LTE Handover from the IP Routing Viewpoint (Part 3) Tech -Blog LTE Korean
46 3GPP Technical Evolution Whitepaper LTE Korean
26

28. Publication: LTE and Wi-Fi Interworking
Title Doc. Type Technology Language
1 Network Architecture for LTE and Wi-Fi Interworking Whitepaper LTE & Wi-Fi Korean
2 Network Architecture for LTE and Wi-Fi Interworking (Part 1: NRM) Tech -Blog LTE & Wi-Fi Korean
3 Network Architecture for LTE and Wi-Fi Interworking (Part 2: Authentication & Security) Tech -Blog LTE & Wi-Fi Korean
4 Network Architecture for LTE and Wi-Fi Interworking (Part 3: IP Allocation) Tech -Blog LTE & Wi-Fi Korean
5 Network Architecture for LTE and Wi-Fi Interworking (Part 4: Traffic Selector) Tech -Blog LTE & Wi-Fi Korean
6 Network Architecture for LTE and Wi-Fi Interworking (Part 5: Location Management) Tech -Blog LTE & Wi-Fi Korean
7 3GPP based LTE and Wi-Fi Interworking Architecture: ePDG (S2b) One-Shot LTE & Wi-Fi English
27

29. Publication: Wi-Fi, Mobile WiMAX
Title Doc. Type Technology Language
1 KT, SKT, LG U+ Wi-Fi Hotspot: Web based Authentication Workflow Tech -Blog Wi-Fi Korean
2 Wi-Fi Roaming Service Logic Tech -Blog Wi-Fi Korean
3 802.1x based Wi-Fi Authentication and Internet Access Tech -Blog Wi-Fi Korean
4 Wi-Fi WPA2 AES(CCMP) Encryption Algorithm Tech -Blog Wi-Fi Korean
5 The Comparison of the Wireless LAN (Wi-Fi) Authentication Methods Tech -Blog Wi-Fi Korean
6 Wireless LAN (Wi-Fi): Standard and Basic Terms Tech -Blog Wi-Fi Korean
7 WiMAX Network Entry Procedure (Simple IP & Mobile IP) Whitepaper WiMAX Korean
8 Mobile IP Security for WiMAX (PMIP & CMIP) Whitepaper WiMAX Korean
28

30. Publication: CDN
Title Doc. Type Technology Language
1 Analysis of Akamai Dynamic Mapping & Route Optimization Technology (co-author) Report Akamai CDN Korean
2 Introduction to the Akamai SureRoute Tech -Blog Akamai CDN Korean
3 Akamai Platform Architecture One-Shot Akamai CDN Korean
4 Akamai Acceleration Concept One-Shot Akamai CDN Korean
5 Google DNS & Akamai CDN Tech -Blog Akamai CDN Korean
6 Korea OTT - Pooq CDN Service Logic & Challenges of ISP (Part 1) Tech -Blog Pooq CDN Korean
7 Korea OTT - Pooq CDN Service Logic & Challenges of ISP (Part 2) Tech -Blog Pooq CDN Korean
8 BT Operator CDN Workflow (Cisco Solution) Tech -Blog BT CDN Korean
9 Introduction of the Transparent Internet Caching (TIC) Tech -Blog Transparent Cache Korean
10 Transparent Internet Caching (TIC) Workflow Tech -Blog Transparent Cache Korean
11 Transparent Internet Caching (TIC) Detailed Workflow Tech -Blog Transparent Cache Korean
12 The Advantage of the CDN (Content Delivery Network) Tech -Blog CDN Logic Korean
13 CDN (Content Delivery Network) and ADN (Application Delivery Network) Tech -Blog CDN Logic Korean
14 Request Routing Technology in CDN Tech -Blog CDN Logic Korean
15 HTTP Cache Control - Expiration and Validation Tech -Blog CDN Logic Korean
16 Use Cases for ALTO within CDNs Tech -Blog ALTO Korean
17 Pros and Cons of BitTorrent P2P Tech -Blog P2P Korean
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31. Publication: IPTV, Video Streaming
Title Doc. Type Technology Language
1 LG U+ Google TV (u+ tv G) Video Request & Delivery (Part 1: Introduction) Tech -Blog IPTV Korean
2 LG U+ Google TV (u+ tv G) Video Delivery (Part 2: LiveTV on TV) Tech -Blog IPTV Korean
3 LG U+ Google TV (u+ tv G) Video Delivery (Part 3: VoD on TV) Tech -Blog IPTV Korean
4 LG U+ Google TV (u+ tv G) Video Delivery (Part 4: YouTube on TV) Tech -Blog IPTV Korean
5 LG U+ Google TV (u+ tv G) Video Delivery Features One-Shot IPTV English
6 IGMP Snooping for IPTV Service Tech -Blog IPTV Korean
7 Personal Video Mosaic EPG Service Tech -Blog IPTV Korean
8 Google Global Cache(GGC) Work Flow for YouTube (Part 1: KT case) Tech -Blog Video Streaming Korean
9 Google Global Cache(GGC) Work Flow for YouTube (Part 2: LG U+ case) Tech -Blog Video Streaming Korean
10 LG U+ vs. KT: YouTube Download Speed Test (Part 1) Tech -Blog Video Streaming Korean
11 LG U+ vs. KT: YouTube Download Speed Test (Part 2) - 24 hours Test using Windows XP Tech -Blog Video Streaming Korean
12 LG U+ vs. KT: YouTube Download Speed Test (Part 3) - 24 hours Test using Windows 7 Tech -Blog Video Streaming Korean
13 Internet Video Tech -Blog Video Streaming Korean
14 Microsoft Silverlight Smooth Streaming Tech -Blog Video Streaming Korean
30

32. Publication: SDN/NFV, Network Protocol
Title Doc. Type Technology Language
1 AT&T R-CORD Packet Walk-Through (login required) One-Shot SDN/NFV English
2 Cisco UCS Solution Tech -Blog SDN/NFV Korean
3 Cisco UCS: VMware's Server Virtualization and Cisco's Virtualization-Aware Networking Tech -Blog SDN/NFV Korean
4 Basic Understanding of the NAT (Network Address Translation) Tech -Blog NAT Korean
5 NAT Behavior Requirements for Unicast UDP (RFC 4787) - Part 1: Mapping Behavior Tech -Blog NAT Korean
6 NAT Behavior Requirements for Unicast UDP (RFC 4787) - Part 2: Filtering Behavior Tech -Blog NAT Korean
7 NAT Behavior Requirements for Unicast UDP (RFC 4787) - Part 3: Deterministic Properties Tech -Blog NAT Korean
8 STUN(RFC 3489) vs. STUN(RFC 5389/5780) Tech -Blog NAT Korean
9 RFC 3489: NAT Behavior Discovery using Classic STUN Tech -Blog NAT Korean
10 RFC 5780: NAT Behavior Discovery using STUN Tech -Blog NAT Korean
11 P2P & NAT: NAT Traversal Technic (RFC 5128) - Part 1: Relaying & Connection Reversal Tech -Blog NAT Korean
12 P2P & NAT: NAT Traversal Technic (RFC 5128) - Part 2: UDP Hole Punching Tech -Blog NAT Korean
13 HTTP 302 Redirection for Hot-Lining Tech -Blog HTTP Korean
14 Understanding the Basic Operations of DHCP Whitepaper DHCP Korean
15 Understanding the Detailed Operations of DHCP Whitepaper DHCP Korean
16 Understanding DHCP Relay Agents Whitepaper DHCP Korean
17 Understanding DHCP Proxy Agents and Security (login required) Whitepaper DHCP Korean
31

33. Publication: SDN/NFV, Network Protocol (cont)
Title Doc. Type Technology Language
18 Understanding the Basic Operations of DHCP Tech -Blog DHCP Korean
19 What is a DHCP Proxy Agent? Tech -Blog DHCP Korean
20 What is a DHCP Relay Agent? Tech -Blog DHCP Korean
21 What is DHCP Option 82? Tech -Blog DHCP Korean
22 DHCP Security Using a DHCP Proxy Agent Tech -Blog DHCP Korean
23 DNS Basic Operation Tech -Blog DNS Korean
24 Three types of DNS message: A, NS and CNAME Tech -Blog DNS Korean
25 Google DNS Tech -Blog DNS Korean
26 The Principle of Ethernet Switch Tech -Blog Switch/Router Korean
27 Part 1: Router Architecture Tech -Blog Switch/Router Korean
28 Part 2: IP Router Packet Forwarding Process Tech -Blog Switch/Router Korean
29 Part 3: L3 Switch Ethernet Switching Process Tech -Blog Switch/Router Korean
30 Part 4: L3 Switch IP Routing Process Tech -Blog Switch/Router Korean
31 Switching and Routing (Part 1: Ethernet Switching) Tech -Blog Switch/Router Korean
32 Switching and Routing (Part 2: IP Routing) Tech -Blog Switch/Router Korean
33 Understanding of the L3 Switch Tech -Blog Switch/Router Korean
34 Basic Understanding of the PBR(Policy Based Routing) Tech -Blog Switch/Router Korean
32

34. Publication: SDN/NFV, Network Protocol (cont)
Title Doc. Type Technology Language
35 OSPF Basic (Part 1: Build of Shortest Path Tree Topology) Tech -Blog Routing Protocol Korean
36 OSPF Basic (Part2: Redistributing External Network Route into OSPF Network) Tech -Blog Routing Protocol Korean
37 Introduction of the IP QoS Tech -Blog IP QoS Korean
38 IP QoS - Scheduling Algorithm (SPQ/WFQ) Tech -Blog IP QoS Korean
39 Policing vs. Shaping Tech -Blog IP QoS Korean
40 Bandwidth Control: Understanding Traffic Policing Tech -Blog IP QoS Korean
41 Subnet Mask and Default Gateway Tech -Blog IP Subnet Korean
42 Answer: Ping problem between servers Tech -Blog IP Subnet Korean
43 Question: Ping problem between servers Tech -Blog IP Subnet Korean
44 ARP and GARP(Gratuitous ARP) Tech -Blog ARP/GARP Korean
45 Packet Header: Ethernet, IP & TCP/IP Tech -Blog Packet Header Korean
33
 Presentation on Netmanias Workshop (Video): QoS Per Hop Packet Processing – Data Plane of Switch/Router

35. Publication: Telecom Operator
Title Doc. Type Technology Language
1 Real-Time Network Performance Monitoring for LTE Services Tech -Blog Monitoring Korean
2 LTE Service Subscription Procedure (Part 1: Offline Subscription) Tech -Blog Subscription Korean
3 LTE Service Subscription Procedure (Part 2: Online Subscription) Tech -Blog Subscription Korean
4 LTE Service Subscription Procedure (Part 3: Comparison) Tech -Blog Subscription Korean
5 The design of LTE over MPLS L3VPN network (Part 1: Concept) Tech -Blog MPLS L3 VPN Korean
6 The design of LTE over MPLS L3VPN network (Part 2: VPN Design) Tech -Blog MPLS L3 VPN Korean
7 The design of LTE over MPLS L3VPN network (Part 3: IP/MPLS Protocol) Tech -Blog MPLS L3 VPN Korean
8 Billing Policy and Charging Technology for Mobile Operator (Part 1) Tech -Blog Billing/Charging Korean
9 Billing Policy and Charging Technology for Mobile Operator (Part 2) Tech -Blog Billing/Charging Korean
10 PBR(Policy Based Routing) Deployment Example of Operator Network Tech -Blog PBR Korean
11 Mobile Operator: Use Case of Hot-Lining Tech -Blog Hot-Lining Korean
34

36. Publication: Enterprise
Title Doc. Type Technology Language
1 Analysis on WAN Acceleration Technologies (login required) Whitepaper WAN Optimization Korean
2 WAN Optimization Solution Tech -Blog WAN Optimization Korean
3 Riverbed Data Deduplication (SDR) One-Shot WAN Optimization Korean
4 Global Server Load Balancing (GSLB) Service for KT ucloud Tech -Blog GSLB Korean
5 Global Server Load Balancing for Enterprise - Part 1: Concept & Workflow Tech -Blog GSLB Korean
6 Global Server Load Balancing for Enterprise - Part 2: Site/Server Selection Policy (1) Tech -Blog GSLB Korean
7 Global Server Load Balancing for Enterprise - Part 2: Site/Server Selection Policy (2) Tech -Blog GSLB Korean
35

37. THANKS FOR READING
CAREER PRESENTATION
December 2017
Chris Changmo Yoo
changmo.yoo@gmail.com
+82-10-3229-1852