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1、TETRA Data Today and TomorrowMark EdwardsPrincipal Staff EngineerMotorola European System Design CentreNovember 20021Slow scan videoTETRA 1 Multislot PDTETRA 1 Circuit dataTETRA 1SDSEmailStreaming videoFile transfer e.gStill imagesAVLDatabase searchHigher Speed DataTETRA 1Single slot PDNot suitableP
2、ossibleAppropriateTETRA Evolution to Meet Market NeedsToday!Available Data CapabilitiesShort DataSimultaneous Voice Data CommunicationStatus MessagingFast pre/defined messagesIP Packet DataReliable communicationResource efficientDynamic PD CH AllocationFlexible resource allocationStatic PD Channel A
3、llocationShared PD ChannelGuaranteed grade of serviceGreater efficiencyGreater data throughputMulti-slot PD ChannelsUp to 4 times throughputPD PrioritisationHigh priority applications are guaranteed accessAdvancedBasic Shared PD Channels: Reduce CostBasic: (Dedicated)The police officer makes his que
4、ry and waits for the resultMeanwhile, 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 AVLMany users can share the PD channel simultaneously in this
5、 waySimultaneous transactions over packet data channelPolice officer queries a database and waits for a resultPolice vehicle sends an AVL report to a location serverSlot 1Slot 2Slot 3Slot 4Slot 1Slot 2Slot 3Slot 4Voice Group 2Voice Group 2Voice Group 1Voice Group 1This could be a data base inquiryTh
6、is could be a response to the data base inquiryshared access uses PD channel capacity more efficientlymore users can share the PD channelless spectrum and hardwareShared Access Multislot Packet Data (MSPD)Same functionality as single slot packet data but fasterPacket Data channel bandwidth is increa
7、sed up to 4 timesCombining up to 4 single slots (i.e. timeslots) in one packet data channelDynamically change the number of slots as voice load variesCo-existence of single and multi slot packet data in whole networkSeparate network resources for single and multi slot at each siteA multislot radio c
8、an operate on a single slot channel if necessaryHandover seamlessly between sites, even when the number of timeslots is differentEnables sophisticated mission critical data applicationsMultislot Packet Data ApplicationsReports sent without delayEnquiry responses much soonerReports sent when traffic
9、allowsEnquiry response when traffic allowsSimplified and faster information flowDetailed images in an acceptable transfer timeHighly detailed images download fasterLimited usefulness: It takes a long time to download a useable imageUseable if download time isnt criticalPatrol Officers can swiftly id
10、entify a suspectImage database to verify a suspects IDReport and text data base enquiriesSingle Slot Packet DataMultislot Packet DataSlow Scan Video for surveillanceGood perception of incidents from field camerasReal time video receptionGood image qualityDisplay freezes for long periods Low quality
11、imagesGPRS and TETRA data rates are similarTETRAGPRSMulti 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 (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-
12、2)Peak = the peak bit rate on the IP channel. Users bit rate depends on application protocolsTETRA has mission critical features that GPRS lacks, i.e. enhanced security, availability, resilienceTETRA shares this bandwidth with less users than GPRSMultislot Packet DataSame interactions as single slot
13、 packet dataVoice priority over dataSDS messages can be carried in spare capacity on packet data channelsHigher data rate enables more advanced applications MSPD already defined within the TETRA standardTIP (TTR 001-05) is approvedenables multi-vendor terminal solution TETRA 2 comparison with TETRA
14、1Range (km)Modulation schemes64QAM16QAM4QAM600 kb/s500 kb/s300 kb/s200 kb/s400 kb/s100 kb/sFraming Rate150 kHz100 kHz50 kHz25 kHzTETRA 128.8 kb/sNetwork Upgrade to TETRA 2Users want to expand networks and support new services and applicationsProtect investmentEase of upgradeTETRA2 standard was devel
15、oped with upgrade in mindnew base stations are high speed data readysoftware upgrade for base stations and coreTETRA fulfilling Mission Critical NeedsTETRA IP data TETRA single slot packet data provide basic data applicationsTETRA Now Present and future TETRA multi slot packet data provide sophistic
16、ated data applications TETRA In the Future Looking towards the horizonTETRA 2 innovation for new data applications Spectrum for TETRA2A challenge to be met by each countrySpectrum requirement for a nationwide TETRA 2 networkAt least 2 x 1 MHz, but 2 x 2 MHz would be betterClose to the TETRA 1 spectr
17、um (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 MoUTETRA Roadmap for DataTETRA V&DTETRA V&DIP ServiceIP ServiceMSPDMSPDHigher SpeedHigher SpeedPacket DataPacket Data19951995First TETRA First TETRA contractcontract20002000First IP First IP delivereddeliveredFutureFuture2005 2005 MSPD MSPD delivereddeliveredstandardstandardTIPTIPIOPIOPstandardstandardTIPTIPIOPIOPstandardstandardTIPTIPIOPIOPstandardstandardTIPTIPIOPIOPEvolutionary stages
