High Speed Wireless Services Using Two Way MMDS System

Transcription

1 High Speed Wireless Services Using Two Way MMDS System Sanjay Moghe Director of Engineering, ADC Telecommunications Phone (612) Joy Laskar President, RF Solutions Phone (404)

2 Snapshot of the Next Century $26 Trillion $48 Trillion $4 Trillion $16.6 Trillion 4.3% 2.5% $5.607 Billion $7.32 Billion $607 Million $1.4 Billion $34 Million $1.3 Billion Number of PC s - World Wide Number of PC s - Desktop Number of PC s - Mobile $150 Million $278 Million $132 Million $230 Million $18 Million $47 Million Source: Business Week, November 18, 1994 Many Wireless Alternatives Wireless Cable MMDS/MDS (2.5GHz) Wireless Access (Fixed Wireless Loop - 2-4GHz) C-Band Broadcast Satellite (4-6GHz) Direct Broadcast Satellite (12GHz) Cellularized Cable (28GHz) Wireless Fiber (38GHz) Broadcast TV (HDTV/SDTV) Broadcast AM and FM Radio (Digital AM/FM) Wireless TV Sales/Polling (IVDS) Wireless Monitoring and Control of Utilities and Security Devices (ISM, N-PCS) Hey Buddy, can you spare a MHz? Wireless Data Analog Cordless Digital Cordless Family Radio Service Cellular PCS Mobile Satellite Service One-way and Two-way Messaging

3 Range Wireless Standards Megacell Iridium GPS Iridium DBS SNG Macrocell Microcell GSM AMPS PCS DCS 3G 4G LMDS MMDS Picocell DECT Wireless LAN Blue Tooth Frequency GHz Convergence Broadband Packet-Based Services! Broadband data VPNs Voice over IP PBX trunking POTS Video Push services Conferencing Dial Access VoIP Voice Data Video over IP Video

4 Broadband Access and Transport Mission Multiservice Delivery to Businesses and Residences - Software and Hardware Solutions BROADBAND LOCAL LOOP ARCHITECTURE

5 Comparison of Various Broadband Technologies Perameter ISDN xdsl Cable Modem MMDS LMDS Deployment cost high high high low to very low medium Deployment time medium medium medium low low CPE cost medium medium low low-medium high Data rate 128 Kbs 1-6 Mbs >1 Mbs M Mbs 1-10 Mbs Bandwidth available 5-42 MHz - up 78 MHz-MMDS/MDS 1100 MHz-A Bandwidth available 132 MHz -ITFS 150 MHz-B Total Capacity high high medium Medium high Coverage area / cell near central office near CO large Km 2-6 Km Symmetry yes may be no may be yes Other Advantages technology ready today Suitable application businesses near CO ( central o ffice) Business/Resi de ntial Business/Residential Business Suitable application International International Suitable application backhaul Other issues not goodfar from CO freq. Coordination with ITFS Fixed Wireless System Architecture XVTR PSTN Private IP Wireless Hub Voice over IP Gateway Bandwidth Manager RF Combiner BWG-5700 RF Transport WMU PBX GW Interne t BWG RF Rcv. Wireless Modem Termination System (WMTS) XVTR XVTR = Transverter WMU = Wireless Modem Unit WMU 10bT Up to 4 POTS

6 Combined Use of MMDS, LMDS And Unlicensed Bands for Broadband Services MMDS cell Unlicensed Band cell LMDS cell 2 LMDS cell LMDS cell LMDS back haul link LMDS cell 1 MMDS Network Migration

7 Super-cell Coverage Deployment C A B B A C Downstream - Omni Upstream - 6 Sectors System Considerations Coverage area Take rate / applications- data, VOIP, video, video conferencing etc. Interference, neighbors, ITFS channels etc. Symmetry u/s, d/s number of cells sectorization frequency planning - u/s, d/s channels, sub channels,frequency reuse Headend modem - modulation, FEC, symbol rate etc. Head end - channels, no of receivers, sectorization Antenna - Headend, transverter, specs.- front to back, side lobes, frequency hopping, space diversity transverter specs.-po, TR on / off, modem performance - symbol rate, equalizer, FEC, modem transverter integration

8 Super-cell Capacity Example 7 D/S 6MHz Channels: 1 x 64QAM 4 x 16QAM 2 x QPSK Aggregate D/S throughput per cell: 113Mbps Total Offered Traffic Daytime Mbps Nighttime Mbps 2 U/S 6MHz Channels: 6 x 1.6MHz 6 x 400kHz Aggregate U/S throughput per cell: 27Mbps Total Offered Traffic Daytime Mbps Nighttime Mbps Common Deployment Scenarios Not all subscribers will have a pristine receive signal Foliage and Terrain blockage Reflections from stationary or moving objects Self-interference from other sectors or cells Not all subscribers will be close to the hub Some sectors may have a large number of business users, while another may be made up of mostly residences Some sectors or cells may have a high density of subscribers, others may be low density Different numbers and combinations of RF channels will be available in each market

9 Next Generation Wireless Modem Termination System (WMTS) Carrier class reliability Integrated QoS to support voice and data services Configuration flexibility to address changing MMDS spectrum requirements Distributed FPGA MAC architecture for market/cell specific configuration selection Overall scalability/flexibility/density to fit broadband wireless applications Wireless Modem Units (WMU): Desktop Data WMU 10BaseT Ethernet QoS supported by external policy-based bandwidth manager Hardware ready for Integrated QoS upgrade SNMP-based agent Automatic carrier and modulation acquisition with CellSpan WMTS Voice support through external VoIP MTA Dynamic bandwidth allocation

10 CPE Block Diagram and picture PC WMU Pwr Insert Transceive r Ante nna 24dBi, 21dBi, or 17dBi 10bT IF Feed Select A tten DC + IF Feed RF Feed N on- Inte gr ated Transceiver/Antenna AC/DC Pwr Supply AC/D C Pwr Supply Tcvr Integrated Transceiver/Antenna Indoor Outdoor Fixed 17dBi Antenna Frequency Plan Example Super-cell upstream Super-cell downstream Mini-cell downstream ITFS Future use Mini-cell upstream M1 A1 A2 A3 A4 C1 C2 C3 C4 E1 E2 E3 E4 G1 G2 G3 G4 ~ ~ M2 B1 B2 B3 B4 D1 D2 D3 D4 F1 F2 F3 F4 H1 H2 H MHz MHz Guard Band

11 Transceiver (MDS US) Block Diagram DC/IF Interface (Female F-Connector) IF Di ple xer IF L O BP F RF LO MD S/ MMDS RF Diplexer R F Interface ( Female N -Connector) US Freq MDS MHz DS Freq: MMDS MHz IF L O Freq: MHz BP F Transc eive r RF LO Freq: GHz US Freq: MDS GHz DS Freq: MMDS GHz MDS US (2ch) MMDS DS (31ch) MHz 2162 MHz 2500 MHz MMDS Deployments Completed a number of successful deployments with large cell architectures Better installation procedures and hardware improvements are making deployments easier Strong interest in MMDS network deployment from large operators like Sprint, MCI, Bell South etc. High capacity sectorized cellular architectures being investigated

12 Next Generation Technologies Challenges Solutions Not all subscribers will have a pristine receive signal Capacity and coverage Many CPE configurations, flexible bandwidth Less interference Lower cost Adaptive Antennas DSP Software Radios DSP A/D Conversion Wide Bandwidth designs Transmitter Development High P/A Linearization (DSP) Integration Electronic Filtering MEMs Switches Quantum MMIC Technology Reduction of Passive Devices High Speed A/D Conversion Wide bandwidth topologies Low Noise Topologies Frequency Agile Active Filtering

13 Quantum MMIC Technology Enabling Technology for Software Radio 10 Gain/Pdc (db/mw) QMMIC SiGe HBT GaAs HBT GaAs MESFET Si BJT Si CMOS Noise Figure (db) RF Filter LNA Mixer IFAmp RF Filter LNA A/D Softwa Radio A/D Software Radio VCO Conclusions Convergence of Broadband Standards MMDS/LMDS will offer megabit services to businesses and residences Last Mile Race Requires High Data Rate Technology Advancements: Component to System will be Required