Broadband Technologies WG Update

Transcription

1 Broadband Technologies WG Update Technology Committee 11/18/04 Title Author Presenter Committee/Doc# Date Audience Broadband Technologies WG Update David Buchanan / Sean O Hara David Buchanan Technology/ TBD 11/18/04 NPSTC Open Committee Meeting 1

2 Working Group Members David Buchanan, Co-Chair Floyd Ritter, Co-Chair Contributors: David Eierman (Motorola) Dave Warner (State of VA) Bette Rinehart (Motorola) Sean O Hara (NSO, State of NY, SRC) Bob Speidel (M-A/COM) Bob Schlieman (State of NY) Maribel Martinez (State of NY) Steve Devine (State of Missouri) 2

3 Working Group Scope Develop recommendations for the planning parameters and guidelines that will be used for Wideband Data (< 1MHz) spectrum management and deployment Create values such that consistency is achieved across Regional Boundaries Maximize Spectrum Reuse Assist early adapter Regions in managing and maintaining their wideband spectrum resources Work with interested Regions Create templates and techniques that will assist planning in other Regions 3

4 Technical Parameter Recommendations Need to understand many elements of the technology, including: SAM ENBW (using 38.4 khz) SAM Power Spectrum (using SAM OFDM model with skirt fits for PA effects) IF Filter Shape and Model (using R s =38.4 ks/s, RRC, α=0.2) SAM Data Rate Sensitivity (i.e. S/N at 1/5% BER, for the various modulation and FEC modes). (using early TIA TR8.5 results) SAM Adjacent Channel Rejection (at various victim bandwidths and adjacent channel offsets) (computing ACCPR for interim) SAM Co Channel Rejection (at various victim and interferer bandwidths) UNKNOWN! Still awaiting information, but have some progress in the interim, which will require verification 4

5 Approximate SAM Adaptive Mode Throughput Sean O Hara, SRC, NCC Meetings February Adaptive Mode Throughput (50 khz, TU50) Throughput (kbps) QPSK 1/2 16QAM 1/2 64QAM 2/3 MAX TU50 model Typical Urban at 50 kph Delay path, 5 µs, -22 db Power (dbm) QPSK 16-QAM 64-QAM 5

6 50 khz Channel, Approximate SAM Throughput Symbol Power SAM Throughput (kbps), 50 khz Channel Width Es/No dbm QPSK 1/2 16QAM 1/2 64QAM 2/3 64QAM MAX GROSS TU50 model NET Typical Urban at 50 kph N/G 87.50% 87.50% 87.50% 87.50% 87.50% MaxT/G 35.94% 35.94% 47.90% 45.89% 47.90% Delay path, 5 µs, -22 db AVET Sean O Hara, SRC, NCC Meetings February

7 Adaptive Mode Coverage -Modulation Mode Shifts (Open/Suburban Environment) QPSK 16-QAM 64-QAM ~5 mi ~3 mi ~12 mi Ht = 50 m, Hr = 2 m SAM ERP: 47 dbm Okumura-Hata-Davidson Suburban Sean O Hara, SRC, NCC Meetings February 2003 NOTE: Median levels used for mode ranges 7

8 Adaptive Mode Coverage (Voice System Overlay- Urban Environment) SAM Receive Power (dbm) C4FM Receive Power (dbm) 50/50 Range (km) 50/50 Range (mi) Okumura Hata Davidson Urban, Ht = 50 m, Hr = 2.2 m C4FM ERP: 54 dbm (250W), SAM ERP: 47 dbm (50W) 100/20W, 6-dB Gain, 2-dB Loss Sean O Hara, SRC, NCC Meetings February

9 Adaptive Mode Throughput (Voice System Overlay) Okumura Hata Davidson Urban, Ht = 50 m, Hr = 2.2 m SAM ERP: 47 dbm No Shadowing w/shadowing (σ = 7dB) Sean O Hara, SRC, NCC Meetings February

10 SAM Throughput Results Average Throughput over 8-km Cell of ~66 kbps Reliable (90%) Throughput of kbps These will be further reduced by channel resource sharing within the user group Access Slot Contention, Slot Scheduling, etc Particularly under heavy loading Reduce the total throughput by an additional 25% to account for these factors (probably more like a third) Therefore, the data that is available from a single 50 khz pair is approximately: 68 to 113 Mb per hour, or 8.43 to MB per hour, reliably (i.e. 90th percentile) 178 Mb, or MB per hour, on average Sean O Hara, SRC, NCC Meetings February

11 Simulated SAM ACCPR Effects 0 SAM IF Filter Model Power Gain and Normalized Interference PSD, Resolution BW: 0.01 khz SAM PSD Model ACCPR = db -200 Interferer PSD, SAM (Simulated SO, March 2004) Victim IF Filter, Root Raised Cosine Intercepted Power Integrated Power Original Offset: 50 khz Offset w/frequency Drift: khz ESTIMATES: FOR ROUGH PLANNING Frequency Sean O Hara, SRC, NPSTC Meetings March

12 Simulated SAM ACCPR Effects Typical Distance (km)* Type Level (dbu) Urban Suburban Open Service Co-Interference Adj-Interference *Okumura-Hata-Davidson, Ht=50 m, Hr=1.5 m, ERP=100 W ESTIMATES: FOR ROUGH PLANNING (Voice System Overlay) BLACK: Co-Channel Interference (~ 5 dbu) RED: Service (~ 40 dbu) BLUE: Adj-Channel Interference ( = ~75 dbu) Sean O Hara, SRC, NPSTC Meetings March

13 Simulated Deployment Effects Sean O Hara, SRC, NPSTC Meetings March

14 Next Steps Get verification of work to date from Industry Perform testbed assignment of 700 MHz wideband resources Testbed Location Region 5 Good mix of terrain Good mix of population Good isolation from other Regions 14

15 Region 5 Test Area - Terrain 15

16 Testbed Assignment of 700 MHz Wideband Resources Will use real site configurations Will use real terrain based packing MLS computation for server identification Reliability degradation-matrix-based channel selection Very sophisticated assignment process A giant step in public safety spectrum management Can be loaded into CAPRAD 16

17 Example of MLS Determination 17

18 Example of Assignment 96 TDD 50-kHz Frequencies 18

19 Example of Assignment 32 TDD 150 khz Frequency Blocks 19

20 Contact For Further Information David Buchanan County of San Bernardino Vice Chair NPSTC Interoperability Committee Co-Chair 700 MHZ Wideband Technologies Working Group (909) Floyd Ritter State of Utah Co-Chair 700 MHZ Wideband Technologies Working Group Sean O Hara NPSTC Support Office/State of NY/Syracuse Research Corporation Vice Chair NPSTC Technology Committee Co-Chair Wideband Working Group (315) ohara@syrres.com