OTE TETRANETWORK AT THE OLYMPIC GAMES D. G. Xenikos TETRA Manager for the Athens Olympic Games
TETRA technology at ΟΤΕ 2 Networks: MOTOROLA infrastructure C4I: Public Safety TETRA in Greece supported by OTE Region : Greek capital Users – Police, Fire brigade … OTElink: Public AccessTETRA in Greece owned by OTE Regions : 5 largest Greek cities, main highways Users • Athens Olympic Organizing Committee (ATHOC) • Athens International Airport • Port of Piraeus • Athens Metro • Athens Tram • Suburban Railway • Embassies’ personnel, security companies, • Public transportation, Post, Company of Water Supply, …
OTElink running the Games • One-time event • TETRA was used for the first time in Olympic Games at such a degree as the main tool for • games administration • venue operation • in-venue transmission of game Results • timers • medical • transportation • security…
Planning the TETRA network • Security • Reliability • Availability • Flexibility • One-time event : • From very little initial information • need to estimate resources (radio-coverage and traffic) • need to device an effective administration model
ΟΤΕ resources for OTElinkduring the Games PersonnelOTE: 71 persons Terminals ATHOC: 8470 (MOTOROLA) Total number of terminals: 16000 (various manufacturers) System MOTOROLA Dimetra 5.0 Two zones Base stations: 45 in Athens region, 23 in other Olympic cities Services: voice and data Traffic capacity was tripled, in large Olympic Complexes it was fivefold the typical capacity of the network
TETRA Traffic –Athens Airport Area PTTs per HOUR (thousands) Day (1 of 4 BS)
~60 Olympic Venuescompetition + non-competition • Athens –Attica • complexes and “isolated” venues • 5 more Greek cities • Thessaloniki • Patra • Irakleio • Volos • Olympia
Radio coverage(OAKA Complex) Served by 7 BS 3 repeaters
QoS measurements (OAKA complex) BER (%) Rx level(dBm) Distance(m) Very good receiving signal Very good resistance to interference
Radio coverage(Ellinikon Complex) Served by 7 BS 2 repeaters
Radio-coverage in “isolated” venues(example: Wrestling Stadium) • Served by • 1 main BS + • 1 secondary serving BS • QoS measurements in all indoor and outdoor areas • with Olympic activity: • Rx level • BER Stadium, ground floor
TETRA traffic in Opening Ceremonies Traffic (1 of 7 BS serving the complex) Time Traffic depends on management structure !!
Statistical Data • Olympic games (all August 2004) • Calls12.4 millionsPTT (Push-to-Talk) • Calls toPSTN and mobile telephony approximately 17000 • Busy calls0.6 %of the total PTT calls • Paraolympic Games (all September 2004) • Calls 6.9 millionsPTT calls • Calls toPSTN and mobile telephony approximately 11000 • Typical TETRA traffic (all April 2004) • Calls 4.7 millionsPTT calls • Public Safety network (C4I) : Total PPT calls ~2 millions
TETRA Traffic –Call duration Distribution of calls Duration of calls (sec) “Heavy tail” – Similarities with packet data traffic – Erlang formulas?
Summarizing For the first time: 2 TETRA networks One is used for all operation needs in Olympic Games in addition to the usual customers of the public network Another is used for Public safety Served unusually high density TETRA traffic 16000 users (public access) 20000 users (public safety) Proven powerful tool for administration of worldwide-scale events