TETRA Evolution

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"TETRA Evolution to Meet the Needs of Next Generation Public Safety Communications Requirements" - David Chater-Lea of Motorola …

"TETRA Evolution to Meet the Needs of Next Generation Public Safety Communications Requirements" - David Chater-Lea of Motorola

Presented in Cambridge Wireless Event: Wireless Security and Defence SIG "Public Safety Requirements - The Next Generation" 14th Oct 2010 at Peterhouse

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  • 1. TETRA Evolution to meet the needs of next generation public safety requirements David Chater-Lea Chairman ETSI TC TETRA WG4 Fellow of the Technical Staff Motorola UK david.chater-lea@motorola.com
  • 2. Relationships European Telecommunications TETRA Association Standards Institute Industry association: Technical committees Users Suppliers Government departments TC TETRA etc... Working groups WG1 WG3 WG4 WG5 WG6 WG8 User Protocols Data, high speed Speech codec Security Direct Mode requirements and advanced air interfaces 2
  • 3. TETRA • TETRA is the open standard developed in ETSI for digital mobile communications • Originally designed for digital two way radio systems in Europe Includes functionality from telephony, public access and private radio systems • Adopted for national public safety systems in most countries in the European Union Austria, Belgium, Denmark, Estonia, Finland, Germany, Greece, Hungary, Italy, Ireland, Lithuania, Netherlands, Norway, Portugal, Sweden, UK.... • Now providing mission critical communications in at least 117 countries world wide Installed Systems by sector Public Safety 32% Transport Utilities 33% 10% Confidential 1% Business and Industry 5% Extraction 5% Government PAMR Military 10% 3% 2% ETSI: European Telecommunications Standards Institute 3
  • 4. Why an open standard? • Open standards benefit the entire market • Common standard to procure equipment against One standard in a large market makes the costs of development viable for manufacturers • Multiple vendors of compatible equipment Price competition Functionality competition Main market and niche market vendors Sourcing from multiple countries Assurance of continued supply • ETSI standards are a proven success – already recognised from GSM 4
  • 5. TETRA Services • A complete set of services, with many applications built on top TETRA call services: Group call Individual call TETRA Modes: TETRA data services: Emergency call Trunked mode Status Broadcast call (with network) Short Data message Telephone call Direct mode Packet data Priority call Repeater Multislot packet data Call queuing Gateway Wideband data (TEDS) Fast call set up (300msec) TETRA supplementary services: TETRA security services: Late entry, priority call, pre-emptive priority call, Authentication dynamic group number allocation, call forwarding, Air Interface Encryption call authorised by dispatcher, ..... (29 SSs) End to End Encryption Terminal disable 5
  • 6. Why TETRA is different from other technologies • TETRA provides a fast group call service 300msec within a site/local area, 500msec nationwide • All informed net, many users listening to the same call simultaneously • Facilities to patch groups together, make broadcast calls to multiple groups, and send radios new group information over the air • Fully integrated speech and data within the same network • Appropriate levels of security and availability for government and other mission critical communications 6
  • 7. TETRA to the present 1996 2000 2004 2008 2012 TETRA STANDARD Voice + Voice + Voice + Direct € Billions ‘X.25’ data IP data IP data + Access TEDS TEDS DEPLOYMENTS TETRA Regional Nationwide International Scale Systems Pilots Systems Systems Single Slot Multi Slot IP TEDS Services Voice + SDS IP data TETRA Enhanced data Data Service M€ 100s Market Investment Manufacturers M€ 10s Standard 7
  • 8. TEDS overview TEDS: The TETRA Enhanced Data Service Error corrected Rate • TEDS provides: 400 kb/s An extension to TETRA 1 for wideband data 300 kb/s 150 kHz Wider channel bandwidths 200 kb/s 100 Different modulation kHz 100 kb/s schemes 50 kHz 50 kb/s Different error 15 kb/s 25 kHz TETRA 1 protection mechanisms Range Time • TEDS allows range and ... Frame 1 Frame 2 ... available bit rate to be 25kHz 1 2 3 4 1 2 3 4 50kHz traded off Frequency Flexibility in design 100kHz Automatic adaptation to 150kHz radio conditions 432 bits with >8000 bits TETRA 1 with TEDS 8
  • 9. Current standards work • Direct Access to TEDS MS must access TEDS channel TEDS channel TETRA 1 control Existing channels before TEDS TETRA 1 channel TETRA 1 channel being granted access to TEDS channel Direct Access TEDS channel TEDS channel MS can access TEDS channel TETRA 1 channel TETRA 1 channel directly 9
  • 10. Direct Access Scenarios • Direct Access allows TETRA to operate in some new scenarios Sectored TEDS TEDS channels or cells TETRA 1 TETRA 1 Sectored cells for TEDS with omnidirectional TETRA 1 channels More bandwidth for TEDS without splitting wide area group calls TEDS TEDS TEDS Asymmetric and shared TEDS TEDS channels or cells TETRA 1 TETRA 1 TETRA 1 TETRA 1 Smaller, high capacity TEDS cells/channels with wide area TETRA 1 cells TEDS channels shared between TETRA 1 cells TEDS TEDS TEDS TEDS TEDS only networks Completion 2011 10
  • 11. New work item: Voice on TEDS • As TEDS allows capacity to be traded off against range, the same principles will allow a very flexible voice service • Lowest modulation rate in 25kHz will allow greater range than today • Higher rates will allow increased capacity e.g. 50kHz channels could support 16 calls or more – twice the number of calls per MHz Better use of spectrum – and equipment – in densely populated areas, special events etc. • Target completion 2013 TEDS TETRA 1 TEDS 11
  • 12. TETRA broadband • New work item to deliver broadband data speeds Requirement from Police Cooperation Working Group • Objectives: a technical solution tailored specifically for the needs of the mission critical community Wide are coverage High availability, allowing fallback operation Compatibility with current TETRA, to allow support in a single terminal Group communications modes High security – contain within envelope of current TETRA security security mechanisms Optimised for spectrum available to the mission critical community – wherever this spectrum will be • System Reference document to assist in spectrum acquisition completed in 2010 • Initial technical papers under discussion • Broadband solution target 2015 12
  • 13. Spectrum issues • No spectrum currently identified for Public Protection and Disaster Relief (PPDR) use for broadband data (or expansion of TETRA/TEDS) Unlikely to be spectrum granted from first phase Digital Dividend NATO resistant to increase in spectrum below 380MHz • One possible way forward is cognitive sharing of spectrum E.g. share spectrum with military or commercial users Priority access to primary user in times of emergency • Work item started and Specialist Task Force proposed to work on cognitive spectrum sharing solution in ETSI Investigate whether there is a technical solution which is acceptable Note: still needs a political solution as well! 13
  • 14. Why a TETRA broadband standard? • Existing technologies can already provide mobile broadband data capability for commercial networks e.g. WiMax, LTE - why not use these? • Answer: the specialist requirements of the PPDR community: Availability, group communications, security, .... • However, a new standard may make use of a lot of existing work to gain the benefits of those existing standards 14
  • 15. Summary • TETRA is already a story of continuous evolution • TETRA will continue to evolve to meet the needs of mission critical users in the future 1996 TETRA EVOLUTION 2010 Flexible Voice + Voice + IP data Direct access Broadband Voice + Voice + voice on mulitslot + TEDS to TEDS TETRA ‘X.25’ data IP data TEDS IP data wideband data wideband data channels TEDS: TETRA Enhanced Data Service 15