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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

377,793

Technical Documents

Eleven EMM Cases in an EMM Scenario (Presentation version)

10/22/2013

24,992

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

92,717

Technical Documents

STUN (RFC 3489) vs. STUN (RFC 5389/5780)

What are the differences between NAT types defined in RFC 3489 and RFC 5780? To understand the differences to be explained below, you must be familiar with the Mapping Behavior and Filtering Behavior of a NAT that we covered last time. What is STUN? STUN is a protocol that allows two devices (P2P devices) to discover the presence and types of a NAT between them, and to find out what Exte...

10/21/2013

49,227

Technical Documents

NAT Behavioral Requirements, as Defined by the IETF (RFC 4787) - Part 3. Deterministic...

NAT Behavioral Requirements, as Defined by the IETF (RFC 4787) Part 1. Mapping Behavior Part 2. Filtering Behavior Part 3. Deterministic Properties This is the last post on RFC 4787. 4. Application Level Gateway For information about Application Level Gateways (ALGs), please click here....

10/10/2013

34,721

Technical Documents

Analysis of SK Telecom's Mobile IPTV Live Streaming (Full HD, HD and SD over LTE-A)

SK Telecom, the Korean No. 1 telecom operator, launched Btv Mobile service (in SD/HD) offering a variety of live broadcasting and VoD contents for mobile devices in around July 2012. And a year later in July 2013, boosted by the commercialization of LTE-A, it began a "Full HD" streaming service with drastically enhanced video quality. The following is the press release by SK Telecom about its n...

09/24/2013

79,471

Technical Documents

NAT Behavioral Requirements, as Defined by the IETF (RFC 4787) - Part 2. Filtering Beha...

NAT Behavioral Requirements, as Defined by the IETF (RFC 4787) Part 1. Mapping Behavior Part 2. Filtering Behavior Part 3. Deterministic Properties Now that we learned a NAT's mapping behaviors last time, below we will study its filtering behaviors as defined in RFC 4787. For information about the terms used below (Internal En...

09/23/2013

34,763

Technical Documents

LTE EMM and ECM States (Presentation version)

09/20/2013

33,697

Technical Documents

LTE EMM and ECM States

Table of Contents 1. Introduction 2. EMM, ECM and RRC States 3. EMM State Transition 4. EMM Features 5. EMM User Information 6. Closing 1. Introduction Through the previous technical documents, we have studied the LTE network architecture and LTE identifications, the fundamentals of LTE technology, and LTE security operation required for a user to...

09/20/2013

281,201

Technical Documents

NAT Behavioral Requirements, as Defined by the IETF (RFC 4787) - Part 1. Mapping Behavior

NAT Behavioral Requirements, as Defined by the IETF (RFC 4787) Part 1. Mapping Behavior Part 2. Filtering Behavior Part 3. Deterministic Properties Many applications like Skype, online games, etc. are all Peer-to-Peer (P2P) applications based on UDP. When running these applications, two devices communicate with each other without a...

09/12/2013

37,303

Technical Documents

LTE QoS: SDF and EPS Bearer QoS (Presentation version)

09/11/2013

36,109

Technical Documents

LTE QoS: SDF and EPS Bearer QoS

Table of Contents 1. Introduction 2. SDF and EPS Bearer 3. QoS Parameters of SDF and EPS Bearer 4. QoS Provisioning and Enforcement 5. An Example for SDF and EPS Bearer QoS 6. Closing 1. Introduction An LTE service provider should be able to make services with different QoS requirements available to its users with different subscription levels. So,...

09/11/2013

353,208

Technical Documents

Netflix HTTP Adaptive Streaming

09/10/2013

26,617

Technical Documents

Network Address Translation (NAT) Overview (RFC 3022/2663)

Today, NATs are employed by Korean telecom operators in almost all of their access networks except for wired access networks (FTTH, Ethernet, DSL, etc.). 3G/LTE network: Large Scale NAT (LSN) installed beyond GGSN/P-GW in the 3G/LTE core networks. Also called "Carrier Grade NAT (CGN)". Wi-Fi Hotspot network: NAT implemented in Wi-Fi hotspot AP. Residential network: NAT implemented in su...

09/03/2013

34,527

Technical Documents

LTE Identification III: EPS Session/Bearer Identifiers

Table of Contents 1. Introduction 2. EPS Session and EPS Bearer: Overview 3. Identifiers for EPS Session/Bearer (Session/Bearer IDs) 4. Summary: Table of LTE Identifiers 5. Closing and References 1. Introduction We have learned about the LTE ID groups such as UE and ME IDs, and Network Equipment (NE) and UE location identifier (location) IDs in LTE Iden...

08/26/2013

237,720

Technical Documents

LTE Identification II: NE and Location Identifiers

Table of Contents 1. Introduction 2. Identifiers for Network Equipment (NE IDs) 3. Identifiers for User Location (Location IDs) 4. Closing and References 1. Introduction In the previous document, “Part I, LTE Identification I” [1], identifications of UE and ME have been described. This document (Part II, LTE Identification II), as the second...

08/26/2013

119,657

Technical Documents

LTE Identification I: UE and ME Identifiers

Table of Contents 1. Introduction 2. Classification of LTE Identification 3. Identifiers for User Equipment (UEI IDs) 4. Identifiers for Mobile Equipement (ME IDs) 5. Closing and References 1. Introduction In LTE network, different IDs are used to identify each entity depending on their relationship with other IDs just like different names and titles ar...

08/20/2013

167,512

Technical Documents

Network Architecture for LTE and Wi-Fi Interworking

08/16/2013

56,179

Technical Documents

LTE Security II: NAS and AS Security (Presentation version)

08/05/2013

25,172

Technical Documents

LTE Security II: NAS and AS Security

Table of Contents 1. Introduction 2. NAS Security 3. AS Security 4. Security Context 5. Closing and References 1. Introduction In LTE Security I[1], Part I of the LTE Security technical document, we have discussed LTE authentication based on EPS AKA procedure and learned a UE and an MME get to share the KASME when authenticated. In this document, w...

08/05/2013

232,265

Technical Documents

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