Wireless WAN Case Study: WiMAX/ W.wan.6
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1 Wireless WAN Case Study: WiMAX/ W.wan.6 Shanghai Jiaotong University Shanghai, China University of New Mexico Albuquerque, NM, USA
2 W.wan.6-2 WiMAX/ IEEE 802 suite WiMAX/ PHY MAC e Past & future vs WiMAX vs 3G End
3 W.wan.6-3 IEEE 802 suite IEEE PAN/LAN/MAN Standards Wired (Ethernet) Wireless : Wireless LAN WiFi : Wireless PAN Bluetooth : Wireless MAN WiMAX : Vehicular Mobility? MobilFi Standard downloads (free 6 months after publication)
4 W.wan.6-4 IEEE802 suite IEEE PAN/LAN/MAN Standards
5 W.wan.6-5 WiMAX & WiMAX = WLL + IEEE Standardization Use point-to-multipoint architecture with stationary rooftop or tower-mounted antennas Worldwide interoperability for Microwave Access WiMAX Standard: IEEE Frequency spectrum around 30 GHz, LMDS, LOS, licensed around 3 GHz, MMDS, NLOS, licensed Last-mile technology: metropolitan area in scale Can serve as backhaul for wireless LANs (802.11)
6 W.wan.6-6 WiMAX & WiMAX = interoperable subset of this (< 6 GHz) GHz LOS Sep a 2 11 GHz NLOS Jan d Similar to.16a Jul e Some Mobility Feb GHz LOS/NLOS Jul 2004
7 W.wan.6-7 WiMAX & WiMAX a/d e Completed December 2001 June 2004 (16d) February 2006 Spectrum GHz < 11 GHz < 6 GHz Channel Conditions LOS NLOS NLOS Bit Rate Mbps in 28MHz Up to 75 Mbps in 20MHz Up to 15 Mbps in 5MHz Modulation QPSK, 16QAM and 64QAM OFDM 256 FFT QPSK, 16QAM, 64QAM Scalable OFDMA 128 to 2048 FFT Mobility Fixed Fixed Portable Channel Bandwidth 20, 25 and 28 MHz 1.25 to 20 MHz 1.25 to 20 MHz Cell size 2-5 km 5-8 km, max 50km based on tower, antenna, tran power 2-5 km
8 W.wan.6-8 WiMAX &
9 W.wan.6-9 WiMAX & PHY Air Interface (PHYs with common MAC) : GHz, a: 2-11 GHz, 2003 Specification Including the MAC layer and PHY layer, of fixed pointto-multipoint broadband wireless access systems providing multiple services. The MAC layer is capable of supporting multiple PHY layer specifications optimized for the frequency bands of the application. The standard includes a particular PHY layer specification broadly applicable to systems operating between 10 and 66 GHz.
10 W.wan.6-10 WiMAX & PHY Multipath signal (NLOS problem, not in LOS) The composition of a primary signal plus duplicate or echoed images caused by reflections of signals off objects between the transmitter and the receiver The echoed signal is delayed in time and reduced in power, and it causes ISI (inter-symbol interface) Solution? (to overcoming multipath signals) Adaptive modulation FEC (Forward Error Correction) Spread Spectrum, OFDM Advanced antenna system Power control
11 W.wan.6-11 WiMAX & PHY Adaptive modulation The further the subscriber is from the base station, the greater the likelihood of a lower form of modulation and a higher amount of coding and thus a lower bit-rate Modulation BPSK QPSK 16 QAM 64 QAM SNR 6dB 9dB 16dB 22dB
12 W.wan.6-12 WiMAX & PHY WiMAX raw bandwidth (Mbps), in theory Modulation code rate QPSK 1/2 QPSK 3/4 16 QAM 1/2 16 QAM 3/4 64 QAM 2/3 64 QAM 3/ MHz MHz MHz MHz MHz
13 W.wan.6-13 WiMAX & PHY WiMAX coverage (Km), in theory Type of area Rooftop antenna Window/fixed antenna Indoor/portable antenna Rural <20 km, NLOS* <8 km < 4km Suburban N/A <4 km <2 km Urban N/A <2 km <1 km * <50 Km is the theoretical maximum for LOS. Assumption is a NLOS base station and a rooftop antenna for better reception and maximum uplink power
14 W.wan.6-14 WiMAX & PHY OFDM = Orthogonal FDM A technique to increase transmission speed by multiplexing Uses one wide frequency channel by breaking it up into several sub-channels ORTHOGONALITY overlapping but distinguishable
15 W.wan.6-15 WiMAX & MAC PMP (Point-to-Multipoint), Connection oriented Support multiple PHYs Dynamic TDMA-based MAC with on-demand bandwidth allocation. (low cost: SS doesn t Tx/Rx simultaneously) FDD Downlink & uplink on separate RF channels Unframed FDD for full-duplex SS Framed FDD, downlink in bursts Static asymmetry TDD Downlink & uplink time share the same RF channel Dynamic asymmetry
16 W.wan.6-16 WiMAX/ MAC Uplink Uses a DAMA-TDMA technique Error correction uses Reed-Solomon code Modulation scheme based on QPSK Downlink Continuous downstream mode for A/V Simple TDM scheme is used for channel access Duplexing technique is frequency division duplex (FDD) Burst downstream mode for IP traffic DAMA-TDMA scheme is used for channel access Duplexing techniques are FDD with adaptive modulation, frequency shift division duplexing (FSDD), time division duplexing (TDD)
17 W.wan.6-17 WiMAX & Technology considerations Licensed vs unlicensed LOS vs NLOS Half-duplex vs full-duplex P2P, PMP, Mesh Fixed, portable, mobile Cost performance throughput = channel bandwidth (Hz) X bits/hz Last-mile tech? T1 replacement WiFi backhaul 3G/4G?
18 W.wan.6-18 WiMAX/802.16e Fixed Portable IEEE standard is designed for fixed-access usage It uses a mounted antenna at the subscriber s site. Fixed model is an alternative to cable modem, DSL, e Targets the mobile market by adding portability. Mobile clients with IEEE e adapters can connect directly to the WiMAX network e uses Orthogonal Frequency Division Multiple Access (OFDMA)
19 W.wan.6-19 WiMAX/802.16e Mobility in e: PHY Layer Sleep mode, paging enabled. Fast time alignment (ranging) mechanism Flexible FFT sizes depending on channel bandwidth to ensure OFDM symbol duration is compatible with mobility requirements Soft handover, i.e., transmit/receive from multiple BS Fast channel feedback Fast BSS handover involving maintenance of sync to multiple BS while transmitting/receiving from anchor BS New MIMO, STC modes MIMO soft-handoff based macro-diversity transmission Space-time codes for 3 antenna configurations. Fixed version has 2 and 4 antenna modes.
20 W.wan.6-20 WiMAX/802.16e Mobility in e: MAC Layer Handover (HO) process defined in MAC including cell reselection target BS scanning network re-entry HO decision and initiation and HO cancellation. Newly defined: MAC messages for each of the handover functions Broadcast paging message Neighbor topology advertisement messages Option of using mobile IP provided Full QoS supported. All four GSM/WCDMA classes.
21 W.wan.6-21 WiMax past & future Evolution of Originally was for bands above 10 GHZ Corporate access, and back haul only, but no mass market a revision was added for bands below 10 GHZ and NLOS The current revision is which combines prior revisions into one e will extend the standard to cover mobile applications Estimate equipment availability and cost 1 st generation: Fixed outdoor antenna/radio, 2005,~$350 2 nd generation: Indoor directional antenna/radio, 2006,~$250 3 rd generation: Integrated system in laptops, 2007 ~$100 Incoming g/i --- Network Management j --- Multihop relay specification k --- MAC layer bridging
22 W.wan.6-22 WiMax past & future 50Mbps WiMAX Bandwidth vs mobility 20Mbps 10Mbps e 1Mbps G fixed nomadic mobile
23 W.wan.6-23 WiMAX/ vs WiFi/ WiMAX/ GHz Licensed, unlicensed < 50 km (typical 5km) Outdoor LOS & NLOS 5bps/Hz peak < 100Mbps in 20 MHz Hundreds CPE On demand: A/V,data Connection oriented TDD/FDD TDMA Technology Spectrum Range Coverage Data rate Scalability QoS Connection type Full duplex Multiple access WiFi/802.11b/g 2.4 GHz unlicensed < 200m Indoor short range 2.7bps/Hz peak < 54Mbps in 20MHz Tens CPE No Connectionless No CSMA/CA
24 W.wan.6-24 WiMAX/ vs WiFi/ Tropos Networks: Integration of & WiMAX as backhaul
25 W.wan.6-25 WiMAX/ vs WiFi/ Tropos Networks: Integration of & WiMAX as transport within the mesh
26 W.wan.6-26 WiMAX/ vs WiFi/ Tropos Networks: Integration of & WiMAX as client connection
27 W.wan.6-27 WiMAX/ vs 3G WiMAX/ Wireless broadband Laptop centric Fixed to portable LOS or NLOS Optimized for data Technology Broadband Client mobility Channels Services WiMAX potential 4G??? 3G Mobile broadband Phones & laptops Roaming / mobility NLOS Optimized for voice
28 W.wan.6-28 WiMAX in China BWA/ in China BWA = Broadband Wireless Access 广带无线接入标准
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