TETRA from A-Z

Introduction to Terrestrial Trunked Radio and BOS

Course Description

System Overview
- TETRA and BOS Application in Secure Authority Environments
  - Example coordinated alarm systems Police, Fire department, etc. FMS
- From Analogue Emergency Radio today to Digital Trunked Radio
  - Limitations and coordination problems of analogue systems, the TETRA promise, system comparison.
TERTA Feature Overview
- Voice and Data Services
- Bearer Services, Teleservices, Supplementary and Security Services
- Short Data Service SDS and Support for VAS
TETRA Standardization Overview
- ETSI Standardization and TETRA MoU

TETRA Network and Standard Interfaces
- Network Elements
  - Base Station, Network Control, Gateways, Repeater.
- TETRA Terminals
  - Analogue Alarm Systems, Digital Alarm Systems, phone and paging combinations
Operational Modes
- Trunked Mode
- Direct Mode (DMO)
  - Individual / group call, late entry, emergency call, TPI, air encryption, pre-emptive call, FEM mode, Dual Watch
- Network Management
TETRA Protocol Stack Overview
- Physical Layer
- MAC Layer and LLC
- Control Plane Entities and Functions
  - Packet Handling, CMCE, Mobility Management
- User Plane Functions
TETRA Data Networks
- Circuit data mode
- Packet mode
  - X.25, TETRA data services, SCLNP
  - Inter-network protocols
- TETRA IP
  - IP Interworking (IPI)
  - TETRA over IP (ToIP)
TETRA Voice coding
- ACELP coding
- Interfaces to other voice systems
Comparison to Public Mobile Systems
- Comparison of TETRA with GSM
  - Differences and Communalities, Convergence of the standards
- TETRA Evolution towards 3G

Multiple Access and Timeslot Structure
- TDMA Frame Structures
  - Hyper Frame, Multi Frame, Frame, Timeslots and Bursts
- TETRA Channel Structure
  - Logical Channels, Traffic Channels, Control Channels, Physical Channels
- Mapping of logical channels to physical channels
TETRA Modulation Schemes
- Phase Modulation
  - π/4-DQPSK, π/8-DQPSK.
- QAM Modulation
  - 4-QAM, 16-QAM, 64-QAM
Coding, Interleaving and Scrambling
- Error Control Schemes for Phase Modulation
- Error Control Schemes for QAM Modulation
RF Power Control and Radio Link Measurements
- Power budgets and range estimation
MAC Layer Details
- LLC
  - PDU types and description, Speed, Channel and Ec/No Estimates
- MAC PDU Description
  - TM-SDU, MAC PDU types and subtypes
Higher Layer Protocol Functions
- RSLC
- CC, SS, SDS
- CMCE
- MM

Address System Overview
- Subscriber Identity
  - TSI - TMCC, TMNC, SSI – ISSI, GSSI, ASSI, System addresses, Comparison to GSM
- Status Reporting and Signaling
Other Identities
- Management Identity
  - TMI
- NSAP
  - Structure and Binding methods
- Equipment Identity
  - TEI

Air Interface Authentication and Key Management
- TETRA authentication
  - MS, infrastructure, mutual authentication, authentication key, equipment authentication
- Key Management mechanisms
  - DCK / GCK, CCK, SCK, OTAR protocols
Air Interface Encryption Overview
- TETRA encryption
  - Security Class, KSG, KSS, use of cipher keys

Individual Circuit Mode
- Call Setup Procedure
  - Traffic channel assignment, REQ to transmit, Response, Permissions, End of Transmission
- Call Clearing
  - Mobile Originated
Group Voice Call
- Call Setup Procedure
  - Traffic channel assignment, REQ to transmit, Response, Permissions, End of Transmission
- Call Clearing
  - SwMI Originated

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