슬라이드 1

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성선 함
5 years ago
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1 Broadband IT Korea Standardization & Chip Development of IEEE n 이석규

2 IEEE n 표준화동향 (1) IEEE n a/g 의전송속도를높이자는의도에서출발, 그후 MAC Throughput 향상목적추가 2002 년 5 월 HTSG (High Throughput Study Group) 승인, 9 월에활동시작 HT Requirements MAC SAP 에서적어도 100Mbps Throughput 지원 a 와 compatibility 보장 Frequency Efficiency: at least 3bits/sec/Hz IEEE n 표준화활동동향 2004년 10월이후현재까지양대진영을형성 TGnSync WWiSE 2005 년 8 월 Ah-hoc meeting 부터양대진영의그룹이이합집산시작 일부규격에대하여 Intel 등의진영과 Anti-Intel 진영으로새로운그룹이형성 TGnSync 와 WWiSE 그룹은그대로존재 2005년 10월, 양대진영의일부멤버들이새로이구성한 EWC 세력등장 조속한표준화완료를주장하지만내면으로는자신들의규격을가지고표준화 이에반기를든세력들이 EWC 의무력화를위해조기표준화완료진행중

3 IEEE n 표준화동향 (2) IEEE n 표준화활동동향 Joint Meeting EWC TGnSync Joint Proposal Draft 1.0 EWC Proposal TGnSync WWiSE WWiSE Others 2006년 1월하와이회의 Joint Proposal과 EWC Proposal간의합의규격 (Draft 1.0) 도출 2006 년 3 월덴버회의 IEEE n Draft 1.0 을 Task Group n 에서승인

4 PHY: Main Features 1. Specification TGnSync+WWiSE+3rd part : EWC (Enhanced Wireless Consortium) 1st Draft version : March High-Throughput MIMO-OFDM System Use of 4 more sub-carriers in 20MHz than a increase rate by a factor of 0.08 Extension to 40 MHz bandwidth (optional) use of 108 data carriers increases rate by a factor of 2.25 Up to 4 spatial streams (optional), 2 spatial streams (mandatory) Backward compatibility with legacy IEEE a/g Cyclic Delay Diversity

5 PHY: Frame Format Legacy Mode Mixed Mode Green Field

6 PHY: Modulation Coding Schemes HT 1 spatial stream mode Index Modulation Code Rate 0 BP 나 1/ QPSK 1/ QPSK 3/ QAM 1/ QAM 3/ QAM 2/ QAM 3/ QAM 5/6 65 Data Rate (MBPS) HT 2 spatial stream mode Index Modulation Code Rate 8 BPSK 1/ QPSK 1/ QPSK 3/ QAM 1/ QAM 3/ QAM 2/ QAM 3/ QAM 5/6 130 Data Rate (MBPS) Max. Data Rate : 540Mbps (600Mbps w/ short GI) 1) 64QAM, 5/6 code rate 2) 40MHz canalization 3) 4 antennas use

7 MAC: Main Features (1) Considerations Compatible with IEEE e Efficiency Rate Adaptation Legacy Protection Features Aggregation Structure Aggregation Exchange Link Adaptation Reverse Link Data Multiple Responder Protection mechanism Co-existence & Channel Management

8 MAC: Main Features (2) LEGACY INTEROP. Long NAV Pairwise Spoofing Single-Ended Spoofing BASELINE MAC Robust Aggregation QoS Support (802.11e) Rx assisted link adapt. ADDITIONAL EFFICIENCY Multi-Receiver Aggregation Bi-Directional Data Flow BA Enhancements Robust & Scalable MAC Architecture CHANNEL MANAGEMENT 20/40 MHz Modes

9 MAC: Current Status of Standard MSDU Aggregation Extended Range & STBC Control frames Power-Save Multi-poll & Multi-TID BA EIFS PCO 20/ 40MHz operation Block Ack Reverse Direction Data flow Coexistence / Channel Management Capabilities Greenfield & RIFS operation PSDU Aggregation HT Control Field L-SIG TXOP Protection (EPP) Link Adaptation / Calibration / ZLF MIMO Power Save Key: Completed Completed New Features

10 MAC: Features Aggregation (A-MPDU) Aggregation (A-MSDU) Block Ack Mechanism N-Immediate BlockAck High Throughput Features Compressed bitmap BlockAck Implicit BlockAck Recipient Partial State Security Long NAV reservation PHY level spoofing Mechanisms to manage coexistence of 20 & 40 MHz channels Channel management and selection Required Level Open & CCMP only

11 MAC: Features High Throughput Features N-Delayed BlockAck PSMP (Power Save Multiple Poll) L-SIG TXOP Protection PCO (Phased Coexistence Operation) Transmit beamforming Fast Link Adaptation Implicit feedback CSI feedback ZLF sounding Calibration Reverse Direction Antenna Selection Required Level

12 Solution for Mobile Handsets MNS Mode (ref.: IEEE /0433) Co-propose from Motorola, Nokia, Samsung VoIP & Huge Data Services for Mobile users SISO Mode with 40MHz BW Maximum Data Rate: 130Mbps Why care about handsets in 11n? Handsets will be the dominant WiFi platform within a few years Relegating handsets to the use of legacy WiFi will delay the adoption rate of 11n Requirements to support handsets are modest (not delay-inducing) Why 11n: new project would com pletely miss market and raise inter working issues

13 Solution for Mobile Handsets Multi-mode handsets The trend in handsets is towards the combination of multiple air-interfaces to cover the widest spectrum of throughput vs distance and connectivity to other platforms. 11n will not fill the entire needed capability space and is no threat to other air interfaces (no one size fits all) Addition of 11n to handsets is a natural fit from both a capability and interconnectivity viewpoint Typical User Data Rate Narrowband Broadband UWB Non-cellular Evolution Bluetooth Wi-Fi a/g Wi-Fi b Wi-Fi n Multīmode handset Next 3.5/3.9/4G generation cellular 3G 2.5G 1G Local Area Wide Area Cellular Evolution

R & D in R & D for IEEE 802.11n 2003 년 :: IEEE 802.

11n 용 Baseband Modem & MAC 개발 Performance: 216Mbps Data Rate with 64-QAM

:: TGnSync 와 WWiSE 의 Spec. 에따른 Baseband Modem & MAC 개발 802.11n 을적용한 MAC 모듈개발 IEEE 802.

14 R & D in R & D for IEEE n 2003 년 :: IEEE a/g Baseband Modem 개발 2004 년 :: 독자규격에의한 n 용 Baseband Modem & MAC 개발 Performance: 216Mbps Data Rate with 64-QAM Configuration: 2x3 MIMO-OFDM & Viterbi Decoder with Virtual 320MHz Clock Speed 2005 년 :: TGnSync 와 WWiSE 의 Spec. 에따른 Baseband Modem & MAC 개발 n 을적용한 MAC 모듈개발 IEEE i Security Module 개발 270Mbps Data Rate with 64-QAM & 5/6 code rate a/g Modem chip HDTV (20Mbps) AP 2x3 MIMO HDTV (20Mbps) 단말기 1 2x3 MIMO 단말기 2 2x3 MIMO Network Bridge

15 R & D in R & D for IEEE n 2005 년 : TGnSync 와 WWiSE 의 Spec. 에따른 Baseband Modem & MAC 개발 20/40MHz BW Dual-mode Discrete RF Module n 을적용한 Modem & MAC 모듈개발 IEEE i Security Module 개발 270Mbps Data Rate with 64-QAM & 5/6 code rate Modem 진단시스템 HDTV 3 대를동시에보여주는시연장면 STA AP

Microsoft PowerPoint ppt

Microsoft PowerPoint ppt Wireless LAN 최양희서울대학교컴퓨터공학부 Radio-Based Wireless LANs Most widely used method Adv: penetrating walls and other obstacles with little attenuation. Disadv: security, interference, etc. 3 approaches: ISM