ECSE413B: COMMUNICATIONS SYSTEMS II Tho Le-Ngoc, Winter 2008
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1 ECSE413B: COMMUNICATIONS SYSTEMS II Tho Le-Ngoc, Winter 2008 Broadband d Access Communications: An Overview
2 COMMUNICATIONS NEEDS & TRENDS multimedia services: Voice, Video distribution, Realtime videoconferencing, Data, for both business and residential customers: Explosive traffic growth Internet growth, VoIP, VideoIP, IPTV Cell phone popularity worldwide Ubiquitous communication for people and devices Emerging systems opening new applications Unified network: Single distributed network, multiple services, packet architecture PAGE 2
3 HOME-USER SERVICES/REQUIREMENTS: an example PAGE 3
4 Internet e Service Evolution o Typical Internet Services High-speed Wireline Internet Services (Cable Modem / ADSL / VDSL) IP service in a home domain 1 ~ 10Mbps(upgraded to 50Mbps) Medium or Low Speed Wireless Internet Services (CDMA2000, WCDMA) Cellular-based l platform : originating/termination i i call Public mobile service, but expensive 144/384 Kbps (1x, WCDMA), 2.4/10Mbps (Ev-DO, HSDPA) High-speed Wireless Internet Service (IEEE series, Private Services) IP service in a local or private area Maximum 54Mbps Demand on a High-speed Portable Internet (PI) Service High-speed data, Low-cost, Portable (Low-mobility) Service Easy service connectivity. Wireline and wireless network convergence. Multimedia services. PAGE 4
5 Multimedia Services: Requirements attributes: high-speed, bursty traffic, various QoS requirements, mobility technical requirements: efficient use of broadband transmission resources fiber can provide high capacity but fiber to every user is expensive for major areas covered by fiber this is the last mile issue. Rate BER Delay Packet Loss Traffic Voice Video Data 8-32 Kbps 1-20 Mbps Mbps <100ms <100ms - <1% <1% 0 Continuous Continuous Bursty PAGE 5
6 CORE & ACCESS TECHNOLOGIES: EXAMPLES MT MT BSA LER LER RAN LER LSR LSR LSR CORE NETWORK LSR LSR LSR LSR LSR LER LER LER BWA NT HEAD-END CABLE PSTN /DSL NT PAGE 6
7 Broadband Local Access WiMax IP Network FTTH DSL or COAX CABLE Data Rates for M ti S i Copper-Based Last Mile Access: xdsl (Digital Subscriber Lines) ADSL: 6 Mbps downlink, 512 kbps uplink for 4 Km or less ADSL2+, VDSL: 30 MBPS downlink, 1 Mbps uplink for 700m Muti-Service GateWay PSTN Cable Modem: Mbps downlink and 512 to 1Mbps uplink (shared both ways) (Most operators put a separate cable since the TV coax is of poor quality to support data) PAGE 7
8 FTTx Extension & DSL CO 2km ADSL2+ 24Mb/s VDSL2 50Mb/s CO FTTN FTTC 0.5km0 ADSL2+ VDSL2 24Mb/s 100Mb/s CO FTTB ALL FIBER: +100Mb/s splitter FTTH DSL FOR THE LAST MILE/KM ( km) IS STILL MORE COST-EFFECTIVE PAGE 8
9 xdsl: an outlook xdsl: digital subscriber loop/line, a family of broadband access technologies provide digital transmission over the copper wires of a local telephone network CATV 23% FTTx Satellite & others 10% 1% total number of broadband connections worldwide: million at the end of growth/week: Million with +800,000 DSL installs 66% xdsl DSL "remains the most popular p broadband access technology" Information from Point Topic, March 2007 PAGE 9
10 WHY? WIRELESS? ubiquitous communication among people and devices for multimedia services. mobility fast deployment easy reconfiguration CONSUMER: Wireless DSL (WiMAX) Voice / Data / Video Inter-device communications (UWB) Streaming Video / 3D Gaming TRENDS: growing g traffic and service shift in wireless. wireless traffic will be dominated by data wireless internet will pass wireline internet cell phone popularity worldwide (exponential growth since 1988, with almost 1 billion users today) military and security wireless needs ENTERPRISE: Unwired Offices and Factories Connected Mobile Devices Ubiquitous Wireless Connectivity BAD WIRELESS HISTORY NOTE: hype in 1990s, but failures around 2000! INFRASTRUCTURE: Voice and Data Last Mile Wireless Backhaul Wireless Service Convergence PAGE 10
11 WIRELESS COMMUNICATIONS: ADVANTAGES: fast deployment easy reconfiguration TECHNICAL CHALLENGES: Narrow vs broadband Propagation: multipath frequency-selective fading, Near- LOS (line-of-sight), Non-LOS Limited frequency bands. Interference limitation NEEDS: adaptive strategies for better use of resources Adaptive QoS. Dynamic resource allocation, Mobility support. Adaptive modulation, coding, antennas. Low-power, low-cost intelligent processing PAGE 11
12 Spectrum Regulation & Standards Worldwide spectrum controlled by ITU-R In US, spectrum controlled by FCC (commercial) or OSM (defense): FCC auctions spectral blocks for set applications. Some spectrum set aside for universal use WARNING: Regulation may limit innovation and slow down system deployment standardization is needed for system interworking Worldwide standards determined by ITU-T Companies want their systems adopted d as standard d (or try for de-facto standards) In US, standards determined by TIA/CTIA (IEEE standards often adopted) In Europe, ETSI is equivalent of IEEE PAGE 12
13 EXAMPLES OF FREQUENCY BAND ALLOCATION: Centimeter-Wave Bands International: 3.5 GHz, 10.5 GHz U.S.: MMDS & ITFS: GHz, Non-Line-of-Sight License-Exempt Bands for Wireless MAN GHz (U-NII) 2.4 GHz License-Exempt: Wireless LANs GHz PAGE 13
14 Example of frequency allocation: License-Exempt Bands PAGE 14
15 PAGE 15
16 Wireless Standard Classification WWAN GSM/ GPRS / CDMA WMAN IEEE WLAN IEEE HyperLan WPAN Bluetooth HomeRF WAN WAN-MAN MAN PAN MAN-LAN LAN-PAN Pico-Cell ~50km ~2km 0km ~10m PAGE 16
17 Distance-based Wireless Standard Classification PAGE 17
18 Wireless Standards: IEEE & ETSI IEEE 802 ETSI WAN UMTS, EDGE (GSM) WiMAX IEEE WirelessMAN MAN HiperMAN & HiperAccess WiFi* IEEE WirelessLAN LAN HiperLAN/2 RLAN IEEE Bluetooth PAN ETSI BRAN PAGE 18
19 Wireless Standard Evolution: Examples YEAR: ~03 ~04 ~05 ~06 ~07 Cellular l 3G MAN e REVd G? LAN a,b,g WiFi: hi-rate WiFi: QoS, Security UWB: USB UWB: proprietary UWB: 1394 PAN Bluetooth v1.1, v2.0 ZigBee UWB: IEEE a PAGE 19
20 Wireless Co-existence kbps Cellular Technologies Voice is the primary source of revenue. Data services: multi-media messaging, gaming & multi-modality modality. Enterprise: PIM & vertical applications. Network services (location, presence, etc.). GPRS/ EDGE UMTS CDMA CM 1x & EV-DO 384 kbps Mobile Wireless Broadband Access Provides data access to computer users on the go. Proprietary solutions have been deployed offering higher speeds than cellular technologies, however, the coverage is still lacking. 1.5 Mbps IEEE Mbps Wireless Local Loop High speed data access to computer users within a limited area. Used as a last mile solution to extend network connectivity Mbps WiFi High speed data access for computers/pdas and handsets kbps Short range Local device communication & content distribution. 10 m 100 m 50 km WAN PAGE 20
21 Data rate 100 Mbps UWB g a 10.6 GHz 10 Mbps b 1 Mbps 3G3G BT Bluetooth 100 kbps ZigBee ZB ZigBee ZB 10 kbps UWB 0 GHz 1GHz 2 GHz 3 GHz 4 GHz 5 GHz 6 GHz PAGE 21
22 Range 10 km 1 km 3G3G 100 m b,g a ZigBee 10 m BT Bluetooth UWB ZB ZB ZigBee 1 m UWB 10.6 GHz 0 GHz 1GHz 2 GHz 3 GHz 4 GHz 5 GHz 6 GHz PAGE 22
23 Power Dissipation 10 W 1 W 3G3G b,g a 100 mw Bluetooth BT UWB 10.6 GHz 10 mw ZigBee ZB ZigBee ZB UWB 1 mw 0 GHz 1GHz 2 GHz 3 GHz 4 GHz 5 GHz 6 GHz PAGE 23
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