Outline. Introduction WiMAX s Features WiMAX s Competitors Conclusion References Ting-Kai Huang, MNET Lab 2

Transcription

1 WiMAX(802.16)

2 Outline Introduction WiMAX s Features WiMAX s Competitors Conclusion References Ting-Kai Huang, MNET Lab 2

3 Introduction Wireless Technologies UWB (PAN) Wi-Fi (LAN) WiMAX (MAN) 3G (WAN) Ting-Kai Huang, MNET Lab 3

4 Introduction Standa rd Usage Throug hput Range Freque ncy UWB a WPAN Mbp s 30 feet 7.5GHz Blueto oth WPAN 720Kpbs 30 feet 2.4GHz Wi-Fi a WLAN 54Mbps 300 feet 5GHz Wi-Fi b WLAN 11Mbps 300 feet 2.4GHz Wi-Fi g WLAN 54Mbps 300 feet 2.4GHz WiMAX d WMAN Fixed 75Mbps (20MHz BW) Typical 4-6 miles Sub 11GHz WiMAX e WMAN Portable 30Mbps (10MHz BW) Typical 1-3 miles 2-6GHz WWAN 384Kbps Typical 1-5 miles 1900MH z WWAN 2.4 Mbps (typical Kbps) Typical 1-5 miles 400, 800, 900, 1700, 1800, 1900, 2100MH z WWAN 2Mbps ( 10Mbps with HSDPA technolo gy) Typical 1-5 miles 1800, 1900, 2100MH z Ting-Kai Huang, MNET Lab 4 Edge 2.5G CDMA2 000/ 1 x EV- DO 3G WCDM A/ UMTS 3G

5 Introduction Why is WiMAX? Ting-Kai Huang, MNET Lab 5

6 Introduction WiMAX s Roadmap Ting-Kai Huang, MNET Lab 6

7 Introduction How to Popularize WiMAX? Standardize ( Interoperability ( Ting-Kai Huang, MNET Lab 7

8 WiMAX 的 Feature Architecture Ting-Kai Huang, MNET Lab 8

9 WiMAX s Features Ting-Kai Huang, MNET Lab 9

10 PHY Features Feature 256 point FFT OFDM waveform Adaptive Modulation and variable error correction encoding per RF burst TDD and FDD duplexing support Benefit Build in support for addressing multi-path in outdoor LOS and NLOS environments Ensures a robust RF link while maximizing the number of bits/second for each subscriber unit Provides the flexibility necessary to operate in many different frequency bands with varying channel requirement around the world Ting-Kai Huang, MNET Lab 10

11 PHY Features Feature Benefit Flexible Channel sizes( 1.75MHz~20MHz,) Designed to support smart antenna systems Provides the flexibility necessary to operate in many different frequency bands with varying channel requirements around the world Smart antennas are fast becoming more affordable, and as these costs come down their ability to suppress interference and increase system gain will become important to BWA deployments Ting-Kai Huang, MNET Lab 11

12 Mac Features Feature Connection-oriented Automatic Retransmission request (ARQ) Support for adaptive modulation Benefit Per Connection QoS Faster packet routing and forwarding Improves end-to-end performance by hiding RF layer induced errors from upper layer protocol Enables highest data rates allowed by channel conditions, improving system capacity Ting-Kai Huang, MNET Lab 12

13 Mac Features Feature Benefit Security and encryption Protects user privacy Automatic Power Control TDM/TDMA Scheduled Uplink/Downlink frames Scalable from 1 to hundreds of subscribers Enables cellular deployment by minimum self interference Efficient bandwidth usage Allows cost effective deployments by supporting enough subs to deliver a robust business case Ting-Kai Huang, MNET Lab 13

14 Mac Features QoS support Feature UPS( Unsolicited Grant Service), rtps( real time Polling Service), ntrps( non real time Polling Service), BE( Best Effort) Benefit Low latency for delay sensitive service( TDM Voice, VoIP) Optimal transport for VBR traffic( e.q., video) Data prioritization Ting-Kai Huang, MNET Lab 14

15 WiMAX s Cooperators/Competitors? Wi-Fi 3G Ting-Kai Huang, MNET Lab 15

16 WiMAX vs 3G Standard Spectrum Bit Rate Service Coverage Mobility Capacity QoS User 3G 3GPP,3GPP2 ITU 2GHz(license) 2Mbps/384kbps/144kbps Voice, data, multimedia Cellular ( 4mile ) Low/high >10 Four class >90million IP base 2-11GHz 75Mbps/16Mbps Voice, data, multimedia Cellular ( 30miles ) Low >100 WiMAX family, IEEE Four class 2005 year Non-all-IP Ting-Kai Huang, MNET Lab 16

17 Conclusions Scheduling for QoS in WiMAX How to connect Wi-Fi and WiMAX Handoff Qos Issues Ting-Kai Huang, MNET Lab 17

18 References IEEE standard Ting-Kai Huang, MNET Lab 18