The Case for LMR Simulcast Coexisting with FirstNet

Transcription

1 The Case fr LMR Simulcast Cexisting with FirstNet Steve Dubberstein General Manager and Engineer, Cmmunicatins Service Wiscnsin LLC Simulcast Frum 20 Las Vegas, Nevada March 24, East Albert Street Prtage WI Lsey Bulevard Suth La Crsse WI S Stughtn Rad Madisn WI

2 Understanding FirstNet LTE LTE Lng Term Evlutin Cmmercial 4G technlgy FirstNet Uses LTE LTE Cverage LTE Push-t-talk Minimum channel 1.25 MHz greater nise bandwidth 700 MHz public safety spectrum 4X r mre sites fr equivalent VHF cverage Added t Specificatin: LTE Lite KHz Channel, 60 t 100 kpbs - Dwnlink OFDMA, Uplink FDMA/GMSK db imprved link budget (cverage) - Fr the Internet f Things LTE is a 4G digital bradband specificatin Push-t-talk specificatin lcked dwn in Release 13 Uses a ne-t-many trunking-like bradcast mde Lw call setup time prmised Still must cnsider the sleep/wake battery limitatins

3 FirstNet MCPTT Specificatin

4 FirstNet MCPTT Push-t-Talk Grup Call Flw

5 FirstNet MCPTT LMR-t-LTE Interface in Release 14

6 FirstNet RFP Understanding FirstNet LTE Aimed at Cellular Operatrs Cmmercial Users OK with Public Safety Pririty Single Natinwide System Award in Nvember years May Start Service by Sharing Existing Cellular System Has Cverage Gals - May be insufficient fr prtable rural cverage Can be Mnetized Disincentive Payments fr Insufficient Sign-up f Public Safety Users - 70% Minimum - $125M t $178M payment if nt met - Culd end up as free r reduced cst service t public safety? FirstNet Missin Critical Push-t-Talk (MCPTT) First MCPTT in service arund 2019 LMR Interface in release 14 planned Practical Use in ? Widespread urban use by 2025? Widespread rural use by 2030?

7 FirstNet Talkarund Understanding FirstNet LTE Called Prximity Services Direct Radi-t-Radi Cmmunicatin ( UE t UE ) Part f Release 12 Uses Uplink Netwrk Must Cntrl the Pwer Ptential Prblems Cmpared t Existing Talkarund Use - Prblem in FirstNet LTE cverage areas - The n-scene firegrund scenari

8 Harris Prtable with Integrated LTE and WiFi Htspt

9 P25 Rural Simulcast Issues t Cnsider P25 Site Spacing in Rural Areas Typical rural site spacing 7 t 15 miles P25 25 usec practical simulcast tlerance Terrain can make fr significant challenges Site spacing beynd 5 miles can be difficult P25 Simulcast Mdulatin Methds fr Narrwband C4FM LSM (Linear Simulcast Mdulatin) Sharper shaping f symbls Allws fr increased simulcast site spacing 800 MHz can use 25 KHz P25 simulcast greater site spacing P25 Subscriber Unit Cmpatibility Demdulatin f P25 simulcast signal acrss manufacturers Demdulatin f P25 simulcast signal by legacy units Cnsistent prgramming acrss manufacturers and platfrms Fire Pass-Alert and Other Audi Issues P25 vcder perfrmance

10 Analg vs. Digital Audi Quality and Cverage An FM analg signal will start t have sme nise befre a digital signal, but an FM analg signal will still be useful when a digital signal is cmpletely gne Analg FM Audi Quality P25 Digital Typical Threshld used fr Cverage Testing Useful Cverage (sme nise in an FM analg signal) Strng Nrmal Weak Radi Signal Strength Cmmunicatins Service Wiscnsin LLC Prprietary

11 The Slutin: Analg Simulcast until FirstNet LTE Operate Analg Simulcast until FirstNet is Practical Matching Cverage LTE Requires 4X the number f VHF Sites Timeframe fr Rural Areas Use LTE t LMR Interface fr Smth Migratin N Mbile, Prtable r Pager Upgrades Required Cst Effective, 10 Year Life

12 Rural Cunty Analg Simulcast Migratin Strategy 2016 Install an Analg Simulcast Radi System fr LMR Cverage Put System int Service Is Public Safety LTE with Push-t-Talk Practical fr Rural Cunties fr by ? Has the FCC Mandated the Next Generatin 6.25 KHz Narrwband, and LTE will nt be ready by ? Cntinue with Analg FM until the Transitin t LTE Upgrade System t P25 Phase I. Mre sites will be required Upgrade System t P25 Phase II. Mre sites may be required Upgrade System t P25 Phase II. Mre sites may be required Cmmunicatins Service Wiscnsin LLC Prprietary

13 Summary Simulcast by Cmmunicatins Service Minimize the Variables Nn-Variable Reliable Backhaul IP Micrwave Keep Identical Audi Respnse Over Time System Cmpnents Eliminate Time Delay Changes Accunt fr Maximum IP Time Delay Advantages ver Self-Adjusting Systems Simplified Design and Optimizatin Mtrla MLC 8000 Mtrla GGM 8000 Ruter and Managed Switch Mtrla Quantar and GTR8000 GTR 8000 has the Same Analg Simulcast Baseband Input as the Quantar Cannt Mix Quantar and GTR 8000 n the Same Channel System Staging Befre Field Deplyment Full System Staging at a Single Lcatin Including Micrwave