ieee 802.11 vht 표준화동향c0%cc%bc... · 2012-03-20 · vht usage model vht usage model...

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근거리무선전송연구팀

이석규

2010.06.22. KRnet 강연

IEEE 802.11 VHT 표준화 동향

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IT R&D Global Leader

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Contents

4. IEEE 802.11 VHT 기술 이슈 (11ac/11ad)

3. IEEE 802.11 VHT 표준 동향 (11ac/11ad)

2. 기존 802.11a/b/g/n과 VHT의 출현배경

1. IEEE 802 및 802.11 Overview

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Sensor (LR-PAN)IEEE 802.15.4

(Zigbee Alliance)

IEEE 802.15.4f

(AutoID Center)

IEEE 802 개요

IEEE 802.15.3

UWB

Wi-Media,

MBOA

WAN

MAN

LAN

PAN ETSI

HiperPAN

IEEE 802.11

Wi-Fi AllianceETSI-BRAN

HiperLAN2

IEEE 802.16d

WiMAX

ETSI HiperMAN &

HIPERACCESS

IEEE 802.20

IEEE802.16e

3GPP (GPRS/UMTS)

3GPP2 (1X--/CDMA2000)

GSMA, OMA

RANIEEE 802.22

WAN: Wide Area Network

RAN: Regional Area Network

OMA: Open Mobile Alliance

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IEEE 802.11 WLAN 개요

WLAN

IEEE 802.11

TGwProtected management

frames

TGaWLAN 5GHz OFDM

TGbWLAN 2.4GHz CCK

TGeProtocol for QoS

TGgWLAN 2.4GHz OFDM

TGzDirect link setup

TGaaVideo transport streams

TGacVery high throughput at <6GHz

TGmbAccumulated maintenance

TGnHigh throughput

TGpVehicular environment

TGvNetwork management

TGsMesh networking

TGuInterworking with external

TGadVery high throughput at 60GHz

TGhDynamic frequency selection

TGiSecurity system

TGf/rFast handover

Orange : recent hot issue

Blue : on activity

Green : terminated

TGafTV White Space

S1GSmart Grid

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IT R&D Grobal Leader

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기존 주요 WLAN 규격

기존 WLAN 규격 (802.11a/b/g/n)

텍스트

IEEE 802.11h : Dynamic Frequency Selection

IEEE 802.11i : 차세대 보안시스템 IEEE 802.11f/r : Fast Handover (with IEEE 802.21 : MIH)

IEEE 802.11s : Mesh Networking

Wi-Fi 인증용 기능 (2007.03부터 시작됨)

사용주파수 대역 2.4GHz 5GHz 비고

무선전송

규격

11b o x 11Mbps (CCK)

11g o x 54Mbps (OFDM)

11a x o 54Mbps (OFDM)

11n o o 130~600Mbps (MIMO-OFDM)

11p x 5.850~5.925 27Mbps (11a 기반 텔리매틱스)

11e o o QoS 지원 MAC 프로토콜

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802.11n WLAN 규격

IEEE 802.11 TGn Spec. (03.11~)

Requirements

11a(5GHz) 및 11b/g(2.4GHz)와의 호환성 지원

주파수효율 3bps/Hz 이상, MAC속도 100Mbps 이상

주파수 대역: 2.4/5GHz 대역

최대전송속도 130Mbps @ 2stream / 20MHz BW(mandatory)

600Mbps @ 4stream / 40MHz BW (optional)

주요 기술적 특성

MIMO-OFDM 방식을 처음 도입함

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802.11n WLAN 규격

802.11n 주요 특성Feature Mandatory Optional

Number of spatial stream 1 and 2 3 and 4

Number of transmit antenna 2 Greater than 2

bandwidth 20MHz 40MHz

Number of occupied subcarriers 56 in 20MHz 114 in 40MHz

Number of data subcarriers 52 108

Number of pilot subcarriers 4 6

Modulation order BPSK, QPSK, 16-QAM,

64-QAM

256-QAM for

Beamforming mode

Code rate 1/2, 2/3, 3/4, 5/6

Guard interval 800ns 400ns

Channel coding Convolutional code LDPC

기타사항 Tx beamforming

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802.11n WLAN 규격

802.11n 표준 일정Event Name Accepted Dates

Actual Predicted

PAR Approved Sep ‘03

Initial WG Letter Ballot Mar ‘06

Recirculation WG Letter Ballot Oct ‘07

Form Sponsor Ballot Pool Jul ‘08

Initial Sponsor Ballot Nov ‘08

Recirculation Sponsor Ballot Jan ‘09

Final WG Approval Jul ‘09

Final EC Approval Jul ‘09

RevCom/ Stds Board Approval Sep ‘09

Publication Oct ‘09 Nov ‘09

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VHT 출현배경

VHT (Very High Throughput)

802.11n 성능포화여건

2008년을 기점으로 802.11n 상용모뎀의 확산

수요 급증하는 초고화질영상전송 지원불가능• Lightly(or not)-compressed video 전송: 1~3Gbps

기존 WLAN에서의 성능조건 변천내역을 참조하여,

VHT 요구조건을 설정하고자 하는 내부 움직임• 11b => 11a => 11n 과정에서 5배수 상향설정 방식이 효과적이었음

2007년 5월 VHT Study Group을 결성하여 논의 착수

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VHT 출현배경

VHT의 출현에 따른 예상 신규수요

초고속 근거리 인터넷 생태계 모델의 재정립

전송장치 초고속화로 융합용 디바이스 수요 신규 창출

Need for

802.11 VHT

standard

Maintain Wired

equivalence

• GigE is widely

deployed

• 10GigE is

emerging

Faster CPUs

Larger and Faster Storage

HD content

• SSD Growing 2x a year

• >80 GB iPOD and camcorders

• DVD Capacity growing 8x

• Blue Ray– 50 GB dual layer

Competitive

environment

driving Proprietary

11n extensions

Proprietary modes fragment

the market

Higher Capacity

Gigabit nano-cells free

capacity for normal

network use

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VHT 진행상황

VHT Study Group 진행

VHT 성능요구 논의사항 (2007.05~)• 11n대비 전송속도 및 주파수효율의 5배 이상 향상

• Coverage의 증대 (11n 시엔 옥내외 60~70m)

• Backward compatibility 지원

• IMT-Adv Nomadic 모드에 대해서는 독립적 관계

• 전력 소모량 감소 기대 (11n 대비 보다 효율적 구현)

VHT 논의의 2갈래 진화 (2007.11~)• 신규시장 예측수요(11n대비 5배 이상 속도) 충족을 위해서 안테나 및

BW 자원의 동반확장 필수적

• 기존 WLAN밴드의 포화 및 WPAN밴드(60GHz) 기술진화를 감안하여 2가지 별도 VHT 진행

– VHTL6 (기존 11n에서 쓰던 5GHz 대역사용 VHT)

– VHT60 (기존 PAN에서 쓰던 60GHz 대역사용 VHT)

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VHT 진행상황

VHTL6 Task Group 출범

VHTL6 (5GHz밴드) • 2008년 11월 (Dallas 회의) Task Group (802.11ac) 본격출범

– 의장 : Osama Aboul-Magd (Nortel=>Samsung)

• 표준작업 예상일정– WG letter ballot initial 2010-11-10

– Sponsor ballot initial 2011-12-01

– RevCom & SB approval 2012-12-01

• 현재, Task Group Document 작업 진행 중– Functional Requirements, Channel Model, Framework, Selection Procedure

• Intel, Broadcom, Marvell, Qualcomm 등 주도

• 80MHz BW 채택이 아예 불가능한 2.4GHz 밴드는 서비스 제외

• 5GHz 밴드에서 80/40MHz BW 활용방안 연구

• 주파수 효율의 향상기술 집중연구

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VHT 진행상황

VHT60 Task Group 출범

VHT60 (60GHz밴드)• 2009년 1월 (LA 회의) Task Group (802.11ad) 본격출범

– 의장 : Eldad Perahia (Intel)

– 부의장 : Vinko Erceg (Broadcom), John R. Barr (Motorola)

• 표준작업 예상일정– WG letter ballot initial 2010-11-10

– Sponsor ballot initial 2011-12-01

– RevCom & SB approval 2012-12-01

• 현재, Task Group Document 작업 진행 중– Functional Requirements, Channel Model, Framework, Selection Procedure

• Intel, SiBEAM, Broadcom 등 주도

• 60GHz밴드에서 2~6 GHz BW 사용하는 RF 기술이 핵심적

• WPAN(802.15.3c)와의 차별성 입증 및 Coverage 확대기술에 주력

• 기존 WLAN(11a/b/n)과의 호환성 지원을 위한 multi-radio가 필요함

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VHT 진행상황

PAR&5C (TG 출범문서)

VHTL6 PAR&5C 특기사항• MAC SAP 속도규정의 STA 개수에 따른 이원화

– 500Mbps 이상 (single-link), 1Gbps 이상 (multi-STAs)

– Multi-STA 환경에서만 적용할 수 있는 기술의 내포 (multi-channel MAC 등)

• 기존 WLAN 호환성에서 2.4GHz 밴드의 제외

VHT60 PAR&5C 특기사항• 영역에 있어서 유사한 규격으로 802.15.3c와 ECMA를 공식 인정

• 802.15.3c와의 병존성 지원사항을 강한 표현으로 기술하였음

• 802.11 WLAN user experience를 강조하여 WPAN과의 차별성을 부각하였음

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VHT 진행상황

향후 Task Group 예상진행 방식

802.11n 때와는 다른 Selection Procedure 도입

Usage

Models

Channel

Models

Functional

Requirements*

Specification

Framework

Sufficient

Support for

Framework?

(50%? or 75%?)

Y

N

Contributionsand Decision

Making on Spec Element(s)

Draft Spec

Complete and

Coherent Enough

for Letter Ballot?

75%?)

Y

N

75% Letter

Ballot

(설명) 요소기술들의 조합으로 정의된Framework

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VHT Usage Model

VHT Usage Model• 각 Task Group에서 논의를 착수한 상태임

• WFA(WiFi Aliance)의 해당문서로부터 논의출발

• 사용환경 母집단에 대하여 VHTL6, VHT60 Mapping 예정

VHTL6 Candidate

Required throughput

• Lightly compressed video

• Compressed video

Environment

• In room or on desk, short

range

• larger area, longer range

• Dynamically changing

• LOS/NLOS

VHT60 Candidate

Required throughput

• Uncompressed video

• Lightly compressed video

• Compressed video

Environment

• In room or on desk, short

range

• Fixed point-to-point

• Mostly LOS

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VHT Usage Model

Category # Usage model Band

<6 GHz 60 GHz

1. Wireless Display 1a Desktop Storage & Display x

1b Projection to TV or projector in conf room (lightly compressed video) x x

1c In room gaming (lightly compressed video) x x

1d Streaming from camcorder to display (lightly compressed video) x x

1e Broadcast TV field pick up ?

1f Medical imaging surgical procedure support x

2. Distribution of HDTV 2a Lightly compressed video streaming around the home x

2b Compressed video streaming around home x

2c Intra large vehicle (e.g. airplane) applications x x

2d Wireless networking for small office x x

2e Remote medical assistance ½ ½

3. Rapid upload/download 3a Rapid sync-n-go file transfer x x

3b Picture by picture viewing x

3c Airplane docking x

3d Movie content download to car x

3e Police / surveillance car upload x

4. backhaul 4a Multi-media mesh backhaul x

4b Point-to-point backhaul x x

5. Outdoor campus / auditorium 5a Video demos / tele-presence in auditorium ?

5b Public safety mesh x

6. Manufacturing floor 6a Manufacturing floor automation x

VHT 사용환경 Mapping Table 일례

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802.11ac 기술이슈

SDMA (Multi-User MIMO)• SDMA allows simultaneous

transmission to multiple users.

– 11n allows transmission to

one user at a time.

• SDMA has the following

advantages:

– Increase network throughput

by adding antennas at the AP

– Reduce client antenna

requirements for low cost

clients.

– Increase per-client throughput

by adding antennas at client

(MIMO) and/or higher BW

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Contiguous/Non-Contiguous 160 MHz

한국전자통신연구원

• Contiguous 160 MHz Transmitted signal consists of a single contiguous

frequency spectrum with 160 MHz bandwidth

• Non-contiguous 160 MHz Transmitted signal consists of two frequency segments,

each 80 MHz wide

Limit to two non-contiguous segments for reasonable tradeoff between complexity and flexibility

U-NII Worldwide U-NII 3U-NII 2U-NII 1

WLAN - 160 MHz

80 MHz

U-NII Worldwide U-NII 3

WLAN

Radar

U-NII 2U-NII 1

WLANWLAN 80 MHz

Radar

WLAN - 160 MHz

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MULTI-USER DIVERSITY

Term. 1 Term. 2 Term. 3Subcarrier 52

ST

A

2

ST

A

2

ST

A

1

ST

A

3

BPSKSubcarrier 1

QPSKSubcarrier 2

16QAMSubcarrier 3

64QAMSubcarrier 4

64QAMSubcarrier 47

16QAMSubcarrier 48

64QAMSubcarrier 49

QPSKSubcarrier 50

16QAMSubcarrier 51

BPSK

Dynamic Multi-User OFDMA• A wireless transmission suffering multi-path propagation experiences

frequency selective fading.

• Hence, the channel gain varies over multiple subcarriers of a certain station (frequency selectivity) as well as for a certain subcarrier among different stations (multi-user selectivity).

• Adaptation in two ways: 1) React to frequency variations by specific modulation/power setting per subcarrier 2) Enable simultaneous data transmission to different stations via (channel dependent) OFDMA

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Optimal BW Expansion 주파수 대역폭을 최적 확장하여 데이터 용량과 전송속도를 증가

시키는 기술

VHTL6의 BW 활용방안• Legacy mode (11a/n): 20/40MHz 지원

• VHTL6 : 40/80 MHz 지원

• Preamble 및 주파수 할당방법의 효율적 재설계 필요

128 subcarrier

40MHz

128 subcarrier 128 subcarrier

80MHz

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802.11ac 표준화 동향

Adhoc Group 결성 (2009.11~)

Letter Ballet까지 4개의 Adhoc Group 중심적 진행 예정

각 Adhoc Group 별로 현재 논의하고 있는 주요 topic 일람


TG ac

Coex PHY MAC MU- MIMO

• Pilots

• Data tones

• Preamble

• Enhanced MCS

• Sounding

• Higher Bandwidth

modulation

• Parsing and Interleaving

• Coding, STBC

• Spatial Mapping & Cyclic

Delays

• OBSS Management

• Multi-Channel

• Non-contiguous

channelization

• MC MAC protocol

• > 80MHz channel

• Backwards compatibility

• CCA

• Channel access Fairness

• Scanning and channel

selection

• Downlink MU-MIMO

• Uplink MU-MIMO

• MU-MIMO parameters

(e.g. # of streams, # of

clients)

• Training protocols

• ACK protocols

• Reservation/polling

• Power saving

• Capability negotiations

• Frame formats

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802.11ac 표준화 동향

Official time line 09-2008: PAR approved

09-2008 : Task Group started

11-2009 : Adhoc Group started

03-2010 (현재) : spec. framework document Rev.9

이후는 예상• 01-2011: WG(Working Group) LB(Letter Ballot) Initial

• 07-2011: WG LB Recirculation

• 12-2011: SB(Sponsor Ballot) Initial

• 03-2012: SB Recirculation

• 12-2012: RevCom(Review Committee) & Standards Board approval


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802.11ad Usage Models

Usage modes ranking orderingRankordering Based on Anticipated Market Volume

1c In room Gaming

3a Rapid Sync-n-Go file transfer

1b Projection to TV or Projector in Conf Rom

2a Lightly compressed video streaming around home

2b Compressed video streaming in a room or to home

1d Streaming from Camcorder to Display

3b Picture by Picture viewing

1a Desktop Storage & Display

2d Wireless Networking for Small Office

6a Manufacturing floor automation

3d Video Content Download to car

4a Multi-Media Mesh Backhaul

4b Point-to Point Backhaul

3e Police / Surveillance Car Upload

1f Medical Imaging Surgical Procedure Support

2c Intra Large Vehicle (e.g. airplane) Applications

5b Public Safety Mesh

1e Broadcast TV Field Pick Up

5a Video demos / telepresence in Auditorium

2e Remote medical assistance

3c Airplane docking

Rankordering Expected Marketing Timing

2b Compressed video streaming in a room or t.o. home

2a Lightly compressed video streaming around home

3e Police / Surveillance Car Upload

1c In room Gaming

1b Projection to TV or Projector in Conf Rom

3b Picture by Picture viewing

1a Desktop Storage & Display

2d Wireless Networking for Small Office

6a Manufacturing floor automation

1d Streaming from Camcorder to Display

3a Rapid Sync-n-Go file transfer

4a Multi-Media Mesh Backhaul

4b Point-to Point Backhaul

1f Medical Imaging Surgical Procedure Support

3d Video Content Download to car

3c Airplane docking

2e Remote medical assistance

5b Public Safety Mesh

2c Intra Large Vehicle (e.g. airplane) Applications

1e Broadcast TV Field Pick Up

5a Video demos / telepresence in Auditorium

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802.11ad Technical Issues

Fast session transfer Provides a seamless transfer of an active session from the 60 GHz

band to the 2.4/5GHz band, and vice versa

Allows devices to maintain connectivity under dynamic conditions

• The devices use very high throughput 60 GHz link(s) when the 60 GHz links

are operational and retain the extended range and reliability afforded by the

2.4 or 5 GHz band when the 60 GHz links are not operational

<6GHz transmission range

60GHz p

lane

<6GHz p

lane

AB

C

DE

FG

AB

C

D

E

F

G

60GHz directional

transmission

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Coexistence

TGad is required to create a Coexistence Assurance

document demonstrating coexistence with other

systems in the band in a shared 60 GHz band in

home and enterprise environments.

Liaison with 802.15.3c (mmWave Alternative PHY)

Liaison with 802.19 (Coexistence Technical Advisory

Group)

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60GHz CMOS transceiver design

New designs using standard chip processes offer

enormous cost reduction vs. traditional high

frequency designs

X Digital CMOS

can now support

60 GHz

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802.11ad 진행 상황

Official time line 12-2008: PAR approved

09-2010: WG(Working Group) LB(Letter Ballot) Initial

05-2011: WG LB Recirculation

09-2011: Form Sponsor Ballot Pool

10-2011: MEC(Mandatory Editorial Coordination) Done

12-2011: SB(Sponsor Ballot) Initial

03-2012: SB Recirculation

07-2012: Final WG approval

07-2012: Final EC(Executive Committee) approval

12-2012: RevCom(Review Committee) & Standards Board approval

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ieee 802.11 vht 표준화동향c0%cc%bc... · 2012-03-20 · vht usage model vht usage model...

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