LTE - Signaling & Protocol Analysis
(Vol.1 RAN and UE)

[3-day course, Euro 3,450.- (net) per participant]

Revisiting important Details of the EPS

• Architecture Overview
  • Evolved Packet Core in Context
    
    • EPC vs. EPS, Non-3GPP Access Networks (trusted / non-trusted)
      
  • Zoom into the EPS
    
    • Functional Overview of Core Network Elements within the EPC)
      
  • Network Elements and their Functions within the EPC
    
    • Mobility Management Entity (MME) (Characteristics (Identification), Interfaces & Protocols, Tasks & Functions of the MME), Serving Gateway (S-GW) (Characteristics (Identification), Interfaces & Protocols, Tasks & Functions of the S-GW), PDN Gateway (P-GW or PDN-GW) (Characteristics (Identification), Interfaces & Protocols, Tasks & Functions of the P-GW), enhanced Packet Data Gateway (ePDG) (Characteristics (Identification), Interfaces & Protocols, Tasks & Functions of the ePDG)
      
• Protocol Stacks
  
  • Control Plane / E-UTRAN - EPC
    
  • User Plane E-UTRAN – EPC (S5/S8 GTP-based)
    
  • User Plane E-UTRAN – EPC (S5/S8 PMIPv6/GRE-based)
    
• Security Architecture
  
  • Overview & Introduction
    
    • Essentials, EPS-AKA, Security is performed independently in two protocol layers, Algorithms)
      
  • Operation of UMTS-AKA
    
  • Key Derivation Function (KDF)
    
    • Comprehension Check & Practical Exercise:
      The KDF S(10) for K(ASME) (Input Parameters)
      
  • EPS-AKA in Operation during Initial Attach Procedure
    
  • Use of the different Security Algorithms

The Non-Access-Stratum: EMM & ESM

• Important EMM-Procedures
  
  • Common Procedures, Specific Procedures, Connection Management Procedures)
    
• State Machine
  
  • Relationship between EMM and ECM)
    
• Network Operation Modes
  
• Message Format
  
  • Security Header
    
• Important EMM-Scenarios
  
  • Attachment through E-UTRAN / new MME, Comprehension Check & Practical Exercise: Building your own EMM: ATT_REQ-Message, Tracking Area Update (Inter-MME / with new S-GW) (Initial Conditions, Detailed Description), Comprehension Check & Practical Exercise: EMM-Message Decode
    
• Important ESM-Procedures
  
  • MME-initiated, UE-initiated
    
• State Machine
  
• Message Format
  
  • Security Header, Procedure Transaction Identity)
    
• Dedicated EPS Bearer Establishment
  
  • Network Initiated (IMS triggered during Call Establishment)  (Initial Conditions, Detailed Description, Detailed Description)

Radio Resource Control

• Overview
  • Transmission of broadcast information, Establish and maintain services, QoS control, Transfer of dedicated control information)
    
• State Characteristics of RRC
  
  • RRC_IDLE, RRC_CONNECTED)
    
• Signaling Radio Bearers (SRB)
  
  • Overview
    
    • SRB0, SRB1, SRB2
      
  • Mapping of RRC-Messages to SRB's and to Channels
    
    • Messages on BCCH (MIB and SIB), Messages on PCCH and DL-CCCH, Messages on DL-DCCH and DL-DTCH, Messages on UL-CCCH, UL-DCCH and UL-DTCH
      
• Message Encoding through ASN.1 PER-unaligned
  
  • Example: The ASN.1-Code of RRC_CONN_REQ ...
    
  • … and the compiled Message Structure (Tree View)
    
  • Important Encoding Rules of ASN.1 PER-unaligned
    
    • Handling of optional IE's, Selection among Options (CHOICE / ENUMERATED), Handling of IE's with variable Length
      
  • Comprehension Check & Practical Exercise:
    
    • Encoding an RRC_CONN_REQ-Message
      
  • System Information Broadcast
    
    • Overview, Example of an MIB, Example of an SIB1, Example of an SIB2, Example of an SIB3

Lower Layers of the Uu-Interface: MAC, RLC & PDCP

• Features of MAC
  • Overview
    
    • Data transfer logical channels ←→ transport channels, Radio resource allocation)
      
  • MAC Random Access Procedure
    
    • Contention based random access procedure, Non-contention based random access procedure)
      
  • Structure of MAC-PDU
    
    • MAC control element, Normal MAC SDU
      
  • MAC Control Elements
    
    • Contention resolution ID, Timing Advance, DRX, Padding, Short, long and truncated buffer status reports
      
• Features of RLC
  
  • Overview
    
    • Data transfer, Error detection and recovery, Reset)
      
  • Structure of RLC PDU
    
  • Structure of RLC AM with PDCP PDU Segments
    
• Features of PDCP
  
  • Overview
    
    • RoHC, Numbering of PDCP PDU’s, In-sequence delivery of PDU’s, Duplicate deletion, Encryption, Integrity Protection)
      
  • Structure of PDCP PDU

X2- and S1-Interfaces: X2AP- and S1-AP-Protocols

• The X2AP Protocol
  • Protocol Stack on the X2-interface
    
  • Tasks & Functions
    
    • Mobility Management, Load Management, X2-Interface Management)
      
  • X2-based Handover Scenario
    
    • Initial Conditions, Detailed Description)
      
• The S1-AP Protocol
  
  • Overview & Introduction
    
  • S1-based Handover Scenario

v1.000

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