1. IMS Architecture and SIP Proxies
- Components: HSS, Proxy-CSCF, Serving-CSCF, Interrogating-CSCF, and Policy Decision Function
- IMS Identifiers
- IMS Message Paths Introduction (Via and Record-Route)
- The Service Path
- Initial Filter Criteria Introduction
2. IMS Identifiers
- IMSI
- UICC
- Home Network, Public ID, and Private ID
- SIP URI Format
3. SIP Architecture
- Requests and Responses
- SIP Message Flow
- SDP Introduction
4. SIP Via Paths
- The Via: Header
- Establishing the Response Path
- Forking—Response Merging
- Loops and Spirals
- Max Forwards
5. SIP Route Headers
- Route Path vs. Via Path
- Record-Route and Route Headers
- Establishing the Route Path
- The Role of the S, I, and P Proxies
6. IMS Service Path
- The Service Path
- Path Header (RFC 3327)
- Service-Route (RFC 3608)
7. DIAMETER
- DIAMETER vs. RADIUS
- AVPs
- SCTP vs. TCP
- IMS Command Values
- IMS DIAMETER Example
8. Initial Filter Criteria
- The User Profile
- How the iFC Is Used
- Understanding XML
- Disjunctive and Conjunctive Normal Form
9. Basic SIP and IMS Specific Headers
- Via, Branch, Max-Forwards
- SIP Dialog (To, From, tag= fields, Call-ID:)
- CSeq, Contact: Expires:
- Proxy-Authenticate:, Proxy-Authorize:
- User-Agent:, Allow:, Supported:
- Content-Type:, Content-Length:
- P-Access-Network-Info
- P-Charging-Vector:, P-Preferred-Identity:, P-Asserted-Identity:, Authorization:
- Security-Client:, Security-Server:
- IMS Signaling Compression (SigComp Architecture)
10. Session Description Protocol (SDP)
- Session Parameters
- SDP Format
- Extending SDP
- SDPng
- Media Negotiation
- Changing Session Parameters
11. QoS, Real Time Media, and RTP
- How Packet Loss, Jitter, and Latency Affects Voice
- Making Voice and Data Coexist Efficiently
- QoS Explained: What It Is and How It Works
- QoS Criteria
- QCI Table: 1-4 vs. 5-9
- Dedicated Bearer When We Need to Change QoS
- Dedicated Bearers
- Dedicated Bearer Establishment
- Sketch Network View of UE with Both Default and Dedicated Bearers
- GBR or Non-GBR
- MBR
- Scheduling Resources for GBR Bearers vs. Not Scheduling for Non-GBR
- Signaling for a Dedicated Bearer (E/W Diagram)
- Channel Quality Indicator (CQI)
- Mechanism for Sending Data to UE in Downlink
- How Uplink Scheduling Differs from Downlink
- Uplink and Downlink Operations to the Associated LTE Physical Channels
- Uplink and Downlink Data Scheduled Every Subframe
12. Presence
- SIMPLE: SIP for Instant Messaging and Presence Leveraging Extensions
- Terminology
- Framework
- Resource List Manipulation Requirements
- Authorization Policy Manipulation
- Acceptance Policy Requirements
- Notification Requirements
- Content Requirements
- General Requirements
13. Charging and New Services within the IMS
- Charging Entities and Functions
- P-Headers Related to Charging
- Diameter and How It Is Used for Ro Interface
14. IMS Call Flow Examples
- LTE Attach Based on an Actual Trace
- Open-IMS Register
- Open-IMS Invite
- Open-IMS Chat Message
- Open-IMS Instant Message
- IMS SIP Register from an Actual Trace
- IMS Invite from an Actual Trace
15. IMS and the DNS
- DNS Basics
- A-Record
- The SRV Record (RFC2782)
- How SIP Uses the SRV Record (RFC3263: Locating SIP Servers)
- How to Configure a SRV Record
- The NAPTR Record (RFC 2915)
- How the P-CSCF Locates the I-CSCF
- Introduction to ENUM (RFC 3761: ENUM Protocol)
- How the S-CSCF Uses ENUM
16. SIP Timers
- UDP and TCP Behavior
- Session-Expires
17. IMS Access Using VoLTE
- IMS Flow Using VoLTE
- IMS Flow VoLTE to CS
- User Plane and Control Plane
18. User Equipment and Radio Frequency
- What Is User Equipment?
- It Is All about Mobility!
- New Requirements of 4G LTE
- Control Signaling Overview (SIP, RCC, Diameter)
- Information Encapsulation Methods: TLV, AVP, XML, ASN.1
- Physical Layer Discussion
- Types of Radio Signaling (History to LTE)
- Types of Radio Architecture
- Non Access Stratum Signaling
- Signaling: OFDMA
- SC-FDMA
- 2G / 3G Fallback to LTE
19. The LTE E-UTRAN
- E-UTRAN
- GSM/WCDMA View
- CDMA View
- Single Component: eNodeB Function and Purpose
- Interfaces: Uu, X2, S1-MME, S1-U
- Separation of Control Plane and User Plane
- Introduction to Paging, Idle and Power Saving
- Introduction to Tracking Areas
20. The UE Power Up Process
- Frequency Scanning on Power-On
- Steps after Power-On
- Uplink Sync on PRACH Channel
- System Information Blocks (SIBS and Types)
- Channel Bandwidth, MIBs, and System Frame Number (SFN)
- Cell Selection Steps
- Random Access Response
- RRC Connection Request
- RRC Connection Setup
- RRC Connection Setup Complete
- RRC Idle State: Re-established and Released
- UE Capability Enquiry from eNB and UE Capability Information Response
- LTE Device Categories (1–5)
- SIB 1 and SIB 2
21. The LTE Attach, GTP, APNs, and Default Bearers
- Initial System Acquisition Steps
- Key System Information Broadcast Messages
- PRACH Channel
- Synchronize with LTE Cell (Downlink and Uplink)
- Request RRC Connection
- Built in Features vs. Configured Features (IMSI, PLMN, Subscriber Info)
- The Attach, GTP, APNs, and Default Bearer Assignment
- Describe Network Attachment in LTE
- Piggybacking Messages
- Establishment of PDN Connectivity from LTE Air Interface
- Attachment to MME: Manage Authentication and Security
- Default Bearer (Connection to PDN)
- SIP Signaling into the IMS
22. Downlink and Uplink Behavior
- Downlink
- Channel Quality Indicator (CQI)
- Dynamic CQI Signaling and QAM
- Reference Signal
- CQI Report (PUCCH)
- CQI Report and Data (PUSCH)
- Periodic and Operator Defined CQI Reporting
- CQI Index Table
- PDCCH
- DCIs
- Uplink
- Uplink Operation (UE to eNodeB)
- Uplink Signaling
- Scheduling Request on PUCCH
- DL Control Information (DCI) on PDCCH
- Buffer Status Report (BSR) on PUSCH
- eNodeB Scheduler
- UL Grand on PDCCH
- Send Data on PUSCH
23. Idle Mode Within and Beyond the UE
- Current Battery Technologies and How They Work
- Saving the Battery and Operator Resources
- Power Saving Features
- Inactivity Timer
- RRC_IDLE
- EMM-REGISTERED
- EMM-IDLE
- Default Bearers Maintained in EPC During Idle
- Contexts Removed in EU-TRAN During Idle
- UE Context Release Request
- UE Context Release Command
- RRC Connection Release
- UE Context Release Complete
- State of EPC Bearers During Idle Mode with S-GW Buffering
- Why Paging Is Necessary
- Idle Mode "Always On" Activities (Cell Reselection, Tracking Area Update, Monitor for Paging, and Exit Idle Mode)
24. Tracking and Paging a UE
- Why Tracking and Paging Is Necessary
- Entities Involved in Tracking and Paging a UE
- Tracking Areas (TAIs)
- Tracking Area Update (TAU)
- Paging to TAIs
- TAU Keep Alive for UE
- TAU Request, Authentication, EPC bearers, TAU response, TAU complete
- T3450 Timer
- GUTI
- Paging Process from E-UTRAN
- Bearer States During Idle Mode
- S-GW Buffering During Idle Mode
- RSRP
- RRC_Idle
- Service Request
- Cell Reselection
25. Handover Between eNodeBs
- The Need for UE Mobility and Cell Reselection
- Cell Reselection Criteria
- Home network Cell
- PLMN Identity
- "Barring" Status Check
- Handover Between eNodeB
- Identify Types of Handover in LTE
- Measurements and Measurement Reporting (Event Driven vs. Periodic Driven)
- Stages of Handover
- Handover Coverage Areas
- LTE Hard Handover: Serving Cells and Target Cells
- RRC Connection Reconfiguration Message: Measurement Criteria (Absolute or Relative) and Measurement Reports
- Handover Prep, Execution, and Completion
- Handover Packet Buffering by SGW
- Handover Data Forwarding Tunnel
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