Wireless MAN 윤종호한국항공대

Transcription

1 Wireless MAN 윤종호한국항공대

2 (Broadband Wireless Access ) (2004) : Air Interface for Fixed Broadband Wireless Access Systems 2~11/10 66 GHz. line of sight(los) point to multipoint topology FDD/TDD Link QoS 120 Mbit/s on each 25 MHz channel.(64qam) Single Carrier Fixed max 50Km Radius a 2 11 GHz, 75Mbps mesh (without relaying by base station) OFDM Not LOS e( ) : Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands Mobile WirelessMAN 2~6GHz, 15Mbps 3~5Km cell radius NLOS WiBro 2.3GHz Licenced Band OFDMA PHY 60Km/h 이동성 Hard Handover 만지원 NLOS

3 IEEE Mobile Broadband Wireless Access (MBWA) Licensed bands below 3.5 GHz IP data transport 1 Mbps 250 Km/h Cell size up to 15 km Competitor to , DSL and cable links (more than 1MBit/s)

4 Classification of Wireless MAN Topology Point to Point BWA Optical Wireless Point to Multipoint BWA Mobility with W/O Technologies Wi Fi with wired MAN Wi Fi with Mobile Router e : WiBro/WiMax Optical Wireless

5 Trends New bands 4.9GHz(50MHz 대역폭 ) for Public Safty Services(2003) Higher speed Orthogon Systems : 300Mbps/30MHz channel 5.8GHz p2p multi beam space time coding New backbone architecture Router based Bridge based VoIP 지원 In flight cell phone/internet service

6 Cisco s 4.9GHz Metro Mobile Network for Public Safty Services(2003)

7 응용분야 Public Safety Solution IP video surveillance Community policing Communications interoperability Telemedicine Traffic light control for ITS Public Sector Solution Ubiquitous wireless access for government DB Data collection : collecting data and filing reports. Public Transit Solution for ITS Intelligent stations Intelligent trains and buses

8 동작예

9 구성요소 end system a/b/g 25 miles 100 km/h 12 ~ 24 Mbps. wireless router Mobile IP for L3 Roaming can be a mobile router Ethernet Interface Serial interface for wireless WAN modems CDMA, GPRS Wireless LAN Interface

10 Backbone for WMAN

11 라우터기반백본망

12 Handover Issues on router based backbone micro mobility : using a bicast macro mobility : need a faster HO

13 IEEE802.16e Handover L2 trigger to L3 Minimal loss of PDUs bicast with buffering Low Handover latency Guarantees QoS during HO Macro Mobility Support Layers L3 : Mobile IP for preserving IP address L2.5 : MPLS Label L2.0 :?

14 브리지기반백본망

15 A Mobile Ethernet A simple Ethernet Bridged Backbone Network for Mobile Subscribers Support fast handover at L2 without L3 Tunneling Support vertical handover using a virtual MAC

16 Virtual MAC Scheme Real MAC 구간 Virtual MAC 구간 Real MAC 구간 Virtual MAC 을 사용해서포워딩 3G Mobile Ethernet MAC 주소바꿈 (Virtual MAC Real MAC) Neighbor Discovery Server < IP, Virtual MAC> binding 등록 < IP, Virtual MAC> binding 등록

17 Virtual MAC

18 In Flight Entertainment(IFE) Cabin Wireless LAN Unit(CWLU)

19 An aircraft = A mobile subnet

20 In Flight Telephone Service 기존 / 개선

21 Direct Air to Ground Telephone Services* *AirCell

22 Direct Air to Ground Telephone Services 기지국 = 200Km 간격, 항로에만설치

23 A Flying Repeater

24 비교 Satellite Telephone Aircell Cost(voice) $2.5~3.5/min <$1/min Cost(data/flight) $14.95~29.95 <$10 Uplink speed 9.6Kbps~5Mbps 3.1Mbps

25 Summary Review WMAN Technologies Focus on Mobility Introduce a new application

26 끝

27 backup

28 STA 456 STA 690 STA 902 STA STA 464 STA 830 STA 1295 STA X = Access Point 48 = Client Laptop STA STA STA 2363 STA Connexion by Boeing Wireless LAN

29 Microwave Oven Emissions vs b Microwave Oven dbμv/m DO-160D Cat H b CH b CH b CH Frequency (MHz)

30 Proximity of Laptops, Access Points, Microwave STA 830 Microwave Oven STA 1295 Access Point #1 Access Point #2 Laptop Microwave Interference Minimal Impact/Improvement Significant Impact (50-80%) throughput reduction) Severe Impact (>80% throughput reduction)

31 Microwave Interference w/ b Wireless LAN Laptop Throughput Minimal Impact/Improvement 7 Sec per 100Kbyte Msg Microwave Starts Microwave Stops Elapsed Test Time (sec)

32 Microwave Interference w/ b Wireless LAN Laptop Throughput Severe Impact/Improvement Sec per 100 Kbyte Msg Microwave Starts Microwave Stops Elapsed Test Time (sec)

33 Reference Model