IEEE 802.11 VHT 표준화동향C0%CC%BC... · 2012-03-20 · VHT Usage Model VHT Usage Model...
Transcript of IEEE 802.11 VHT 표준화동향C0%CC%BC... · 2012-03-20 · VHT Usage Model VHT Usage Model...
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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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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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802.11ac 기술이슈
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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802.11ac 기술이슈
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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802.11ac 기술이슈
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
한국전자통신연구원
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
한국전자통신연구원
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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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802.11ad Technical Issues
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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802.11ad Technical Issues
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