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Transcript
TETRA ARCHITECTURE AND INTERFACES Dr. M. Nouri New Technologies Senior Manager OTE Agenda • 1. TETRA Architecture and Standard Interfaces • 2. Description of Individual Interface – Network Aspects and Scenarios – Services – Protocols • 3. TETRA Standard Gateways – Features • 4. Network Management System • 5. Control Room Gateway • 6. Conclusions Typical TETRA Network 1b External Network Management 3 1a BS BS TETRA Infrastructure NMS BS BS BS BS 6 2 5 Control Room PSTN, ISDN PDN 4 Line Station (Despatcher) .Another TETRA Network Air Interface (AI) Variants DMO AIR I/F TMO AIR I/F PEI TM V+D Air Interface Air Interface V Uplink D TETRA Infrastructure TDMA FRAME V TS 1 D TS 2 D TS 3 V TS 4 V V D Downlink TS = Time Slot TM V+D AI Services • Speech • Data – Circuit mode – Packet mode – Short data service • • • • Supplementary Services Call Control Mobility Management Security Services TM V+D AI Data Rate Capacities (kbit/s) BANDWIDTH ON DEMAND Number of Timeslots 1 2 3 4 No Protection 7.2 14.4 21.6 28.8 Low Protection 4.8 9.6 14.4 19.2 High Protection 2.4 4.8 7.2 9.6 TM V+D AI Protocol Stack CONTROL PLANE • Call Control • Short Data • Supplementary Services • Mobility Management MM USER PLANE • Packet Data CMCE • Speech • Circuit Mode Data PD Layer 3 Mobile/Base Link Control Entity Logical Link Control Layer 2 Medium Access Control Physical Layer Layer 1 Direct Mode AI Scenarios 1. INDIVIDUAL CALL 2. GROUP CALL NETWORK NETWORK AUTHORIZING MOBILE STATION 4 3. DUAL WATCH 4. MANAGED DIRECT MODE Direct Mode AI Scenarios (contd.) REPEATER GATEWAY NETWORK 5. DIRECT MODE REPEATER 6. DIRECT MODE GATEWAY REP/GW/ AUTHORIZING MOBILE REP/GW NETWORK 7. DIRECT MODE REPEATER/ GATEWAY NETWORK 8. MANAGED REPEATER/ GATEWAY DM AI Protocol Stack CONTROL PLANE USER PLANE Call Control Circuit Mode Data Intrinsic Services Speech Short Data Direct Mode Call Control Layer 3 Layer 2 Data Link Layer Layer 1 Physical Layer Services Supported by ISI To Other Regional SCN To other TETRA Networks ISI Regional To other Local SCN Legend SCN: Switching Control Node NMS: Network Management System BS: Base Station Example: ISI Group Call Configuration ISI REQUESTING AND PARTICIPATING NETWORK ISI PARTICIPATING NETWORK CONTROLLING AND PARTICIPATING NETWORK ISI : Protocol Stack TETRA INFRASTRUCTURE 1 TETRA INFRASTRUCTURE 2 ton TETRA ANF TETRA ANF Specific TETRA Operation c TETRA operation Specific TETRA Operation ITU-T Rec. X.229 ITU-T Rec. X.229 ISO/IEC 11582 ISO/IEC 11582 ISO/IEC 11572 ISO/IEC 11572 ETS 300 402-1 and 2 Layer 1 ETS 300 402-1 and 2 Layer 1 PRIVATE SIGNALLING SYSTEM 1 (PSS1) USED IN ISI STANDARD IP Inter-working Interface Host Packet Data Network Inter-Network Backbone Gp Gi GGSN BG Gi BG GGSN Gn Gn Internal Backbone Internal Backbone ISI HDB TETRA Infrastructure 1 VDB HDB VDB TETRA Infrastructure 2 Peripheral Equipment Interface (PEI) TE2 MT2 TETRA INFRASTRUCTURE PEI PEI Protocol Layers APPLICATIONS AT TNP1 PD UDP/IP IP PPP V. 24/V. 28 TO MOBILE STATION Circuit Mode Data Standard API and Applications Applications Internet Access Standard API Bearer Service TETRA ADAPTATION LAYER AVL Proprietary WAP SDS Telemetry IP Packet Data Circuit Mode Data IP and TETRA Network Network Management System WAP Terminal Database IP Content Provider WAP GW Internet LAN Server IP IP IP Corporate Intranet IP Switching/ Routing Network IP IP Bluetooth IP TETRA Infrastructure Voice/IP Dispatcher IP Control Room Server GPS PSTN Gateway PSTN GW PSTN ISDN Gateway 2B+D 30B+2D ISDN GW ISDN Network Management (1) (Internal) NMS Server Disks Server 15” LAN Authentication Centre NMS Client 21” 21” 21” ROUTER SCN Client 21” LAN ROUTER LAN 15” 21” Network Management (2) (external) ISI TETRA 1 TETRA 2 NMS NMS ISI ISI TETRA 3 NMS Types of NM Functions • Performance Management • Fault or Maintenance Management • Subscriber Management • Accounting Management • Security Management ENM Control Room Gateway (1) GSM Internet GPS Databases ICCS Corporate Intranet Control Room Gateway AVL Controller Internet Server Dispatchers TETRA PSTN / ISDN Legacy Radios • IT System • Call Logging • CCTV • Paging • Fax / Email • Voice Recording •Others Control Room Gateway (2) To control room application client • Not standardized because of different applications requirements from different user sectors API Client • Current trend is to include Flexible Application Programming Interfaces (APIs) to facilitate communication with the API client • Management of following functionalities through API using API libraries or through messages : • Audio parameters • Individual and Group Users • Supplementary services • Alarms Application Server Gateway Engine To TETRA Switch Interface Conclusions TETRA Architectures and Interfaces allow: • Spectrally-efficient feature rich communication • Choice of trunked or direct modes • Interoperability between different TETRA networks • Multimedia services and Internet access • Extensive data applications capability • Inter-working with public networks • Use of control room gateways in public safety and other sectors