Transcript TETRA Template
November 2006
TETRA Data Today and Tomorrow
Mark Edwards Principal Staff Engineer Motorola European System Design Centre 1
TETRA Evolution to Meet Market Needs
TETRA 1 Circuit data TETRA 1 SDS TETRA 1 Single slot PD TETRA 1 Multislot PD Today!
Higher Speed Data
Database search AVL Email File transfer e.g
Still images Slow scan video Streaming video Not suitable Possible Appropriate
Available Data Capabilities
PD Prioritisation High priority applications are guaranteed access Multi-slot PD Channels Up to 4 times throughput Dynamic PD CH Allocation Static PD Channel Allocation Shared PD Channel IP Packet Data Short Data Flexible resource allocation Guaranteed grade of service Greater efficiency Greater data throughput Reliable communication Resource efficient Simultaneous Voice Data Communication Fast pre/defined messages Status Messaging Advanced Basic
Shared PD Channels: Reduce Cost
Simultaneous transactions over packet data channel
– Police officer queries a database and waits for a result – Police vehicle sends an AVL report to a location server
Basic: (Dedicated)
– The police officer makes his query and waits for the result – Meanwhile, nobody else can make use of the PD channel until this transaction finishes.
Advanced: (Shared)
– At the same time the police officer is waiting for his database response, the police car can be sending its AVL – Many users can share the PD channel simultaneously in this way
Shared Access
This could be a data base inquiry Slot 1 Slot 2 Slot 3 Slot 4 Voice Group 1 Voice Group 2 Voice Group 1 Voice Group 2 This could be a response to the data base inquiry Slot 1 Slot 2 Slot 3 Slot 4
shared access uses PD channel capacity more efficiently more users can share the PD channel less spectrum and hardware
Multislot Packet Data (MSPD)
Same functionality as single slot packet data – but faster Packet Data channel bandwidth is increased up to 4 times – Combining up to 4 single slots (i.e. timeslots) in one packet data channel Dynamically change the number of slots as voice load varies Co-existence of single and multi slot packet data in whole network – Separate network resources for single and multi slot at each site – A multislot radio can operate on a single slot channel if necessary – Handover seamlessly between sites, even when the number of timeslots is different
Enables sophisticated mission critical data applications
Multislot Packet Data Applications
Single Slot Packet Data Multislot Packet Data Report and text data base enquiries
Reports sent when traffic allows
Enquiry response when traffic allows
Reports sent without delay
Enquiry responses much sooner Simplified and faster information flow Image database to verify a suspects ID
Limited usefulness: It takes a long time to download a useable image
Useable if download time isn’t critical
Detailed images in an acceptable transfer time
Highly detailed images download faster Patrol Officers can swiftly identify a suspect Slow Scan Video for surveillance
Display freezes for long periods
Low quality images
Real time video reception
Good image quality Good perception of incidents from field cameras
GPRS and TETRA data rates are similar
TETRA Multi slot (Slotted semi duplex) GPRS GPRS Class 3 MS (2 down, 2 up)
Above L2 (peak): 15.2 kbps Above L2 (peak): 15.2/23.2 kbps (CS-1/CS-2)
GPRS Class 4 MS (3 down, 1 up)
Above L2 (peak) DOWN: 22.8/34.8 kbps (CS-1/CS-2) Above L2 (peak) UP: 7.6/11.6 kbps (CS-1/CS-2)
Peak = the peak bit rate on the IP channel. User’s bit rate depends on application protocols
TETRA has mission critical features that GPRS lacks, i.e. enhanced security, availability, resilience TETRA shares this bandwidth with less users than GPRS
Multislot Packet Data
Same interactions as single slot packet data – Voice priority over data – SDS messages can be carried in spare capacity on packet data channels Higher data rate enables more advanced applications MSPD already defined within the TETRA standard – TIP (TTR 001-05) is approved – enables multi-vendor terminal solution
TETRA 2 comparison with TETRA 1
Framing Rate
600 kb/s 500 kb/s
150 kHz
400 kb/s 300 kb/s
Modulation schemes
64QAM 16QAM 4QAM
100 kHz
200 kb/s 100 kb/s 28.8 kb/s
50 kHz 25 kHz TETRA 1 Range (km)
Network Upgrade to TETRA 2
Users want to expand networks and support new services and applications – Protect investment – Ease of upgrade TETRA2 standard was developed with upgrade in mind – new base stations are high speed data ready – software upgrade for base stations and core
TETRA fulfilling Mission Critical Needs
TETRA IP data – TETRA single slot packet data provide basic data applications TETRA Now –
Present and future
– TETRA multi slot packet data provide sophisticated data applications TETRA In the Future –
Looking towards the horizon
– TETRA 2 innovation for new data applications
Spectrum for TETRA2
A challenge to be met by each country Spectrum requirement for a nationwide TETRA 2 network – At least 2 x 1 MHz, but 2 x 2 MHz would be better – Close to the TETRA 1 spectrum (350 MHz in China) ETSI analysis on requirements (TR 102 513) Now is a good time for operators and users to begin talking to regulators and the TETRA MoU
TETRA Roadmap for Data
1995 First TETRA contract TETRA V&D standard TIP IOP Future 2005 MSPD delivered 2000 First IP delivered IP Service standard TIP IOP MSPD standard TIP IOP Higher Speed Packet Data standard TIP IOP Evolutionary stages