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KRnet 20121
Outline
Wi-Fi network: state of the art
Gigabit Wi-Fi (IEEE 802.11ac/ad)
Extended Wi-Fi (IEEE 802.11af/ah)
Future Wi-Fi Technology and Application
KRnet 2012Slide 2
PHY
SponsorBallot
MAC
Study groups
802.11kRRM
802.11rFast Roam
802.11 (’99)2.4GHz
PublishedStandard
g54 Mbps2.4GHz
eQoS
iSecurity
f Inter AP
hDFS & TPC
802.11VNetwork
Management
802.11uWIEN
802.11YContentionBasedProtocol
WG Letter Ballot
802.11 -2007
802.11aaVideo Transport
802.11acVHT 5GHz
TG without Approved draft
Discussion Topics
PublishedAmendment
802.11nHigh
Throughput(>100 Mbps)
802.11WManagement
Frame Security
802.11zTDLS
802.11pWAVE
802.11afTVWS
Smart Grid
802.11aiFILS
802.11 ah
802.11mbRevisionWNG
jJP bands
802.11 -2003
a54 Mbps
5GHz
b11Mbps 2.4 GHz
d
802.11sMesh
802.11aeQoS Mgt Frames
802.11adVHT 60 GHz
IDS
CMMW
Wi-Fi network: state of the art
2
KRnet 2012
802.11kRRM
802.11rFast Roam
a 54 Mbps5GHz
b11 Mbps2.4GHz
dIntl roaming
802.11VNetwork
Management
802.11sMesh
802.11uWIEN
802.11YContentionBasedProtocol
802.11nHigh
Throughput(>100 Mbps)
802.11WManagement
Frame Security
802.11zTDLS
802.11pWAVE
802.11-1999
PHY
MAC
802.11-2012
802.11-2007
802.11aaVideo Transport
802.11aeQoS Mgt Frames
802.11ah<1GHz
802.11acVery High
Throughput6Gbps @ 5GHz
802.11aiFILS
802.11adVery High
Throughput6Gbps @ 60GHz
802.11afTV Whitespace
802.11-2003
g54 Mbps2.4GHz
eQoS
iSecurity
hDFS & TPC
jJP bands
f Inter AP
Wi-Fi network: state of the art
3
KRnet 20124
Gigabit Wi-Fi (IEEE 802.11ac)
Goal A maximum multi-STA throughput of at least 1Gbps and a maximum single link
throughput of at least 500Mbps
Technology Comparison between 802.11a/n/ac802.11a 802.11n 802.11ac
Frequency band 5 GHz only 2.4 GHz/5 GHz 5 GHz only
Channel Bandwidth 20 MHz 20 MHZ/40 MHz 20 MHz/40 MHz/80 MHz/160 MHz/80+80 MHz
Number of Spatial Stream 1 1~4 1~8
Peak PHY Rate 54 Mbps 600 Mbps 6.9 Gbps
Key Technology OFDM MIMO MU-MIMO
KRnet 2012
Gigabit Wi-Fi (IEEE 802.11ac)
5
VHTL6⇒IEEE802.11ac
VHT60⇒IEEE802.11ad
VHT SG focus:- Throughput : Maximum channel bandwidth ~ 80 MHz and Peak Data Rate at least 2 Gbps
- Range: Provide better/higher data rates at longer range than what is available with TGn
-Power: Power consumption for traffic upload or download should not be more than half of what it would be when using TGn power save features and at the same range
Discussion on Propatationbetween 60GHz and 5GHz:- Pathloss- PA Power- Blockage effect- etc
Conclusion:60 GHz frequency band maynot be suitable for applicationsthat require similar rangerequirements and applicationsas 802.11a/b/g/n systems.
Split!!
KRnet 20126
Gigabit Wi-Fi (IEEE 802.11ac)Cable / DSLModem
WLAN Bridge
IPTV Boxe.g. Roku
Kids Surveillance Monitor
Entertainment PC
CloudBack UpDrive
Car Video ContentServer
NAS Drive
DTV1
DTV2
Car Parked in Carport
Kids Room Surveillance Video Cam
KRnet 20127
Gigabit Wi-Fi (IEEE 802.11ac)
11n 11acSU-MIMO Up-to 4 spatial streams. Up-to 8 spatial streamsMU-MIMO Not defined. Defined in AP-to-Non_AP STA:
- Max # of Nss per user in MU: 4- Max # of MU users: 4- Max # of Nss over all users in MU: 8
Bandwidth Maximum 40MHz Maximum 160MHz- Mandatory: 20/40/80MHz- Optional: 160MHz, 80+80MHz
MCS BPSK, QPSK, 64QAM BPSK, QPSK, 64QAM,256 QAM (optional)
Max Throughput 600 Mbps 6933.3 Mbps11.5
times
Higher MIMO, Wider bandwidth, and Higher MCS are introduced
KRnet 20128
Gigabit Wi-Fi (IEEE 802.11ad)
Goal A maximum single link throughput of at least 1Gbps
Technology Comparison between 802.11ac/ad802.11ac 802.11ad
Frequency band 5 GHz only 60 GHz only
Channel Bandwidth 20 MHz/40 MHz/80 MHz/160 MHz/80+80 MHz
2.16 GHz
Number of Spatial Stream 1~8 1
Peak PHY Rate 6.9 Gbps 6.7 Gbps
Key Technology MU-MIMO Directional antenna
KRnet 20129
Gigabit Wi-Fi (IEEE 802.11ad)
clip/movie
Rapid Upload / Download
Wireless Display WLAN
~1GbpsRange <3-8m, LOS, specific placementLatency ~ ok
1080p today (~3Gbps)Max rate + compressionRange 5-10m, NLOSLatency < 15ms (gaming)
Max Avail BandwidthEfficient handling of Mixed typesRange 5-10m, ~NLOS Latency < 30ms
KRnet 201210
Gigabit Wi-Fi (IEEE 802.11ad) Usages are peer-to-peer (ad-hoc) in nature
No device is dedicated for a particular function
All devices in the network perform the role of a content consumer or content creator or both
Access to WLAN infrastructure may not be required in all cases
In order to achieve higher throughputs directional antennas are key to any design This can be achieved through antenna arrays which helps to steer the beam in one
direction or through sectorized antennas
Directional communication:efficient, high rate
Omni communication: expensive, much lower rate or shorter range
Sector sweeping
KRnet 201211
Extended Wi-Fi (IEEE 802.11af) Goal
Define modifications to both the 802.11 physical layers (PHY) and the 802.11 Medium Access Control Layer (MAC), to meet the legal requirements for channel access and coexistence in the TV White Space
Technology Comparison between 802.11ac/af
802.11ac 802.11af
Frequency band 5 GHz only TV White Space only
(e.g., 54~72, 76~88, 174~216 470~698MHz)
Channel Bandwidth 20 MHz/40 MHz/80 MHz/160 MHz/80+80 MHz
4/8/16/32 MHz
(not decided yes)
Number of Spatial Stream 1~8 4 (not decided yet)
Peak PHY Rate 6.9 Gbps TBD
Service Coverage <250m < 1Km
KRnet 2012
Extended Wi-Fi (IEEE 802.11af)
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Cellular Traffic Offloading A/V Streaming throughout entire household
Key Requirements: • Protection to the incumbent users, to meet legal requirements • Appropriate data rates to provide good user experience with extended coverage area
KRnet 2012
Extended Wi-Fi (IEEE 802.11af) In November 2008, the FCC approved the use of White Spaces by
unlicensed devices, which introduced up to a total of 180 MHz available for portable operation.
The final rules from the FCC where announced in late 2010.
Similarly Ofcom is working on developing white space rule for UK territory, and it will be finalized before the end of year 2012.
Regulators around the world are interested in the use of geo-location database techniques to enable the use of White Spaces.
IEEE 802.11 TGaf is currently working on the standard wireless LAN operation on White Spaces. General rule for White Space is “Devices should transmit after querying a
database”
KRnet 2012
White Space Map (WSM)
Extended Wi-Fi (IEEE 802.11af)
KRnet 2012
Contact Verification Signal (CVS)
Extended Wi-Fi (IEEE 802.11af)
KRnet 2012
Extended Wi-Fi (IEEE 802.11af) The PHY for one TVWS channel (6MHz, 7MHz or 8MHz) is based on the
40MHz 128FFT VHT PHY.
Support for multi-channel coexistence : The pre-VHT fields shall be placed around the middle of each TVWS channel irrespective of the number and location of the channels used for transmission
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KRnet 201217
Extended Wi-Fi (IEEE 802.11ah) Goal
Defines enhancements to the IEEE 802.11 Medium Access Control (MAC) to support an Orthogonal Frequency Division Multiplexing (OFDM) Physical layer (PHY) operating in the license-exempt bands below 1 GHz, e.g., 868-868.6 MHz (Europe), 950 MHz -958 MHz (Japan), 314-316 MHz, 430-434 MHz, 470-510 MHz, and 779-787 MHz (China), 917 – 923.5 MHz (Korea) and 902-928 MHz (USA)
Technology Comparison between 802.11af/ah802.11af 802.11ah
Frequency band TV White Space only
(e.g., 54~72, 76~88, 174~216 470~698MHz)
Below 1 GHz excluding the TV White Space bands
(e.g., 902~928MHz)
Channel Bandwidth 4/8/16/32 MHz
(not decided yes)
1/2/4/8/16 MHz
Number of Spatial Stream 4 (not decided yet) 4
Peak PHY Rate TBD TBD
Service Coverage < 1Km < 1Km
Supported maximum STAs 2,007 About 8,000
KRnet 2012
Extended Wi-Fi (IEEE 802.11ah) Use Cases: Smart Grid – Meter to Pole
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Wide Area
GasMeter
WaterMeter
PowerMeter
Distributed Automation
Device
Neighbor Area Home Area
Wireless communication linkWired communication link
Proposed infrastructure
Data Collector & Control
IEEE 802.11ahAP
Distributed Automation
Device
KRnet 2012
Extended Wi-Fi (IEEE 802.11ah) Hierarchical Structure of Traffic Indication Map
Divide the total AID space into small blocks in a hierarchical manner and transmit only the blocks with non-zero values Easier to break a large TIM into small groups of STAs and easier to maintain
Different classes of STAs can be easily grouped into different groups/pages (e.g. Sensor STAs in Page 1 and Offloading STAs in Page 2)
Three level hierarchy: Page/Block/Sub-Block
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Page 1 Page 2 Page 3 Page 4
NB (e.g. 32) Blocks:
8 Sub-blocks:
NP (e.g. 4) Pages:
1 octet = 8 STAs
2048 STAs
Supporting max TBD STAs (e.g. 8192)
Block1 Block2 Block3 Block4 Block5 Block6 Block7 Block8 Block31 Block32
64 STAs
…
KRnet 2012
Extended Wi-Fi (IEEE 802.11ah) The STAs can be grouped into AID groups/pages
STAs supporting different use cases can be easily grouped into different Pages Sensor stations (infrequent traffics) Page 1
Offloading stations (frequent traffics) Page 2
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KRnet 2012
Future Wi-Fi Technology and Application Future Wi-Fi Technology
Gigabit Wi-Fi Wi-Fi VHT5G : certification program of IEEE 802.11ac
Wi-Fi 60G : certification program of IEEE 802.11ad
Extended Wi-Fi Wi-Fi TVWS (TV Whitespace) : certification program of IEEE 802.11af
Low Power Wi-Fi Wi-Fi NPS (Network Power Save) : certification program of IEEE 802.11v
Wi-Fi Power Conservation
Future Wi-Fi Application Wi-Fi HotSpot 2.0 : certification program of IEEE 802.11u
Wi-Fi Display, Wi-Fi Serial BUS, Wi-Fi Docking, Wi-Fi NAN (Neighbor Awareness Network)
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KRnet 2012
Conclusion 1st Generation (1997)
IEEE 802.11 (2Mbps)
2nd Generation (1999) IEEE 802.11b (11Mbps)
3rd Generation (2002) IEEE 802.11g/a (54Mbps)
4th Generation (2007) IEEE 802.11n (Up to 600Mbps, Most common is 150Mbps)
5th Generation (2012) IEEE 802.11ac (Up to 6.9Gbps, First solution is 1.3Gbps)
6th Generation (????) IEEE 802.11af, IEEE 802.11ah : Super Wi-Fi, M2M/IoT
22
KRnet 2012
References 11-12-0182-01-0000-802-11-snapshots-march-2012
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