TETRA Data Today and Tomorrow

1、november 20061 tetra data today and tomorrow mark edwards principal staff engineer motorola european system design centre slow scan video tetra 1 multislot pd tetra 1 circuit data tetra 1 sds email streaming video file transfer e.g still images avl database search higher speed data tetra 1 single sl

2、ot pd not suitablepossibleappropriate tetra evolution to meet market needs today! available data capabilities short data simultaneous voice data communication status messaging fast pre/defined messages ip packet data reliable communication resource efficient dynamic pd ch allocation flexible resourc

3、e allocation static pd channel allocation shared pd channel guaranteed grade of service greater efficiency greater data throughput multi-slot pd channels up to 4 times throughput pd prioritisation high priority applications are guaranteed access advanced basic shared pd channels: reduce cost basic:

4、(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

5、 can share the pd channel simultaneously in this way 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 slot 1 slot 2 slot 3 slot 4 slot 1 slot 2 slot 3 slot 4 voice group 2 voice group 2

6、 voice group 1 voice group 1 this could be a data base inquiry this could be a response to the data base inquiry shared access uses pd channel capacity more efficiently more users can share the pd channel less spectrum and hardware shared access multislot packet data (mspd) same functionality as sin

7、gle 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

8、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 r

9、eports sent without delay enquiry responses much sooner reports sent when traffic allows enquiry response when traffic allows simplified and faster information flow detailed images in an acceptable transfer time highly detailed images download faster limited usefulness: it takes a long time to downl

10、oad a useable image useable if download time isnt critical patrol officers can swiftly identify a suspect image database to verify a suspects id report and text data base enquiries single slot packet datamultislot packet data slow scan video for surveillance good perception of incidents from field c

11、ameras real time video reception good image quality display freezes for long periods low quality images gprs and tetra data rates are similar tetragprs multi slot (slotted semi duplex)gprs class 3 ms (2 down, 2 up) above l2 (peak):15.2 kbpsabove l2 (peak):15.2/23.2 kbps (cs-1/cs-2) gprs class 4 ms (

12、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. users bit rate depends on application protocols tetra has mission critical features that gprs lacks, i.e. enhanced security, availability, resilienc

13、e 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 th

14、e tetra standard tip (ttr 001-05) is approved enables multi-vendor terminal solution tetra 2 comparison with tetra 1 range (km) modulation schemes 64qam 16qam 4qam 600 kb/s 500 kb/s 300 kb/s 200 kb/s 400 kb/s 100 kb/s framing rate 150 khz 100 khz 50 khz 25 khz tetra 1 28.8 kb/s network upgrade to te

15、tra 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

16、 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,