SlideShare a Scribd company logo

082112 aruba 11ac webinar

•
•
Aruba, a Hewlett Packard Enterprise company
Aruba, a Hewlett Packard Enterprise company

The document discusses the upcoming 802.11ac Wi-Fi standard. It provides an overview of key 802.11ac features such as wider 80MHz and 160MHz channels, 256-QAM modulation, support for up to 8 spatial streams, and multi-user MIMO. These enhancements are expected to provide over 10 times the throughput of 802.11n and enable new high-bandwidth applications. The standard is being developed by the IEEE with certification from the Wi-Fi Alliance expected in early 2013.

Related slideshows

Air heads rio 2010 aruba pef overview
Air heads rio 2010 aruba pef overviewAir heads rio 2010 aruba pef overview
Air heads rio 2010 aruba pef overview
 
2012 ah apj wlan security fundamentals
2012 ah apj wlan security fundamentals2012 ah apj wlan security fundamentals
2012 ah apj wlan security fundamentals
 
Aruba networks webinar_wi-fi_without_interruption_sep20_2012
Aruba networks webinar_wi-fi_without_interruption_sep20_2012Aruba networks webinar_wi-fi_without_interruption_sep20_2012
Aruba networks webinar_wi-fi_without_interruption_sep20_2012
 
1 of 36
Download to read offline
11 Fact vs. Fiction Gigabit Wi-Fi 802.11ac © Copyright 2012. Aruba Networks, Inc. All rights reserved Dorothy Stanley, Aruba Networks Craig Mathias, Farpoint Group
2 Webinar Overview •  The next major development in wireless LAN technologies – 802.11ac •  Features, benefits, and limitations •  Availability and timelines •  Real-world throughput expectations •  Migration planning, requirements, and related costs •  Gigabit Wi-Fi use cases •  Setting expectations for the enterprise © Copyright 2012. Aruba Networks, Inc. All rights reserved
3 Our Speakers for Today Dorothy Stanley Craig Mathias }  Founder (1991) and Principal with Farpoint Group }  Advisory services for wireless and mobile }  Member, IEEE }  Advisory Board Member for Interop, Co-Chair of Mobile Connect, and Analyst Partner at 4G World }  Columns for Information Week and TechTarget }  Blog at Network World }  Head of Standards Strategy, Aruba Networks }  Chair IEEE 802.11v, IEEE 802.11Revmb }  Liaison IEEE 802.11 to IETF }  Vice-chair Wi-Fi Alliance Security Marketing, Security Technical and Wireless Network Management Marketing Task Groups © Copyright 2012. Aruba Networks, Inc. All rights reserved
4 Standards Review Dorothy Stanley
5 11ac Standards Discussion 1.  IEEE P802.11ac – Project Definition, Scope & Schedule 2.  Benefits: Usage Models & Application Environments 3.  Key Technical Components 4.  Summary © Copyright 2012. Aruba Networks, Inc. All rights reserved
6 IEEE P802.11ac Basics •  Title: Enhancements for Very High Throughput for operation in bands below 6GHz •  Scope: Modifications to both the 802.11 physical layers (PHY) and the 802.11 Medium Access Control Layer (MAC) }  At least 1 Gbps Multi-station (STA) throughput and a maximum single link throughput of at least 500 Mbps. }  6 GHz below carrier frequency operation excluding 2.4 GHz }  Backward compatible and coexistence with legacy IEEE802.11 devices in the 5 GHz unlicensed band. •  Project Purpose: Significantly higher throughput for existing WLAN application areas and to enable new market segments for operation below 6 GHz including distribution of multiple multimedia/data streams. Source: P802.11ac Project Authorization Request (PAR) © Copyright 2012. Aruba Networks, Inc. All rights reserved
7 IEEE Standards Development: Process Flow – 802.11ac 7 Source: https://mentor.ieee.org/802.11/dcn/10/11-10-0617-01-0000-ieee-standards-process-overview.ppt and http://standards.ieee.org/develop/policies/opman/sb_om.pdf Idea Project Approval Process Develop Draft Standard in Working Group Sponsor Ballot IEEE SA Standards Board Approval Publish Standard Standard is Active; can be transferred to Inactive status, reviewed every 10 years Maximum of 4 years, + extensions 2008 Oct 2008 2009-2012 2013 Dec 2013 Early 2014 802.11ac Dates © Copyright 2012. Aruba Networks, Inc. All rights reserved
8 An aside: 802.11ad ≠ 802.11ac •  IEEE 802.11ad: }  60GHz specification }  Appropriate for shorter range in-room use cases }  Gigabit data rates }  Expected approval in Dec 2012 © Copyright 2012. Aruba Networks, Inc. All rights reserved
9 802.11ac Categories of Usage Wireless Display In Home Distribution of HDTV and other content Rapid Upload/Download of large files to/from server Backhaul Traffic (e.g. Mesh, Point-to-Point) Campus / Auditorium deployments Manufacturing Floor Automation Source: https://mentor.ieee.org/802.11/ dcn/07/11-07-2988-04-0000- liaison-from-wi-fi-alliance-to- 802-11-regarding-wfa-vht- study-group-consolidation-of- usage-models.ppt also see: https://mentor.ieee.org/802.11/ dcn/09/11- 09-0161-02-00ac-802-11ac- usage-model-document.ppt
10 Example: Video requirements Video type Description Rate Packet error rate Jitter Delay Uncompressed 720p (RGB) 1280x720 pixels; 24 bits/pixel, 60 frame/sec 1.3 Gbps 10-8 5 msec 5 msec 1080i (RGB) 1920x1080/2 pixels; 24 bits/pixel, 60 frame/sec 1.5 Gbps 10-8 5 msec 5 msec 1080p (YCrCb) 1920x720 pixel; 24 bits/pixel, 60 frame/sec 1.5 Gbps 10-8 5 msec 5 msec 1080p (RGB) 1920x720 pixel; 24 bits/ pixel, 60 frame/sec 3.0 Gbps 10-8 5 msec 5 msec Lightly Compressed Motion JPEG2000 150 Mbps 10-7 10 msec 10 msec H.264 70 – 200 Mbps 10-7 10-8 20 msec 20 msec Compressed Blu-rayTM 50 Mbps 10-7 20 msec 20 msec HD MPEG2 20 Mbps 3x10-7 20 msec 20 msec © Copyright 2012. Aruba Networks, Inc. All rights reserved
11 Key Technical Components 1.  Wider channels: 80 MHz &160 MHz channel bandwidths 2.  New modulation & coding: 256-QAM, rate ¾ and 5/6, added as optional modes 3.  More spatial streams: Up to 8 (had 4 in 802.11n) 4.  Multi-user MIMO (MU-MIMO) Source: IEEE 802.11ac framework document, see https://mentor.ieee.org/802.11/dcn/09/11-09-0992-21-00ac-proposed-specification-framework-for-tgac.doc © Copyright 2012. Aruba Networks, Inc. All rights reserved
12 80 MHz and 160 MHz channel bandwidths •  80 MHz mandatory, 160 MHz optional •  80 MHz channels are ‘new’ channels: }  Like two 40 MHz channels but with tones in the middle filled in •  160 MHz channels are defined as two 80 MHz channels }  May be contiguous or non-contiguous © Copyright 2012. Aruba Networks, Inc. All rights reserved
13 20/40 and 80/160 Channelization Channels defined for 5 GHz bands (U.S. regulations), showing 20, 40, 80 and 160 MHz channels (channel 144 is now allowed in the U.S. for one additional 20 MHz, one 40 MHz and one 80 MHz channel) Channel Frequency (MHz) US U-NII I and U-NII II bands U-NII I: 5150-5250 MHz (indoors only) U-NII 2: 5250-5350 MHz 8x 20 MHz channels 4x 40 MHz channels 2x 80 MHz channels 1x 160 MHz channel U-NII II requires DFS (& TPC if over 500mW / 27dBm EIRP) 149 161157153 Band Edge (ISM) Channel Frequency (MHz) 5745 5765 5785 5805 5850 Band Edge 5725 US-only U-NII 3 / ISM band 5725-5825 MHz 5x 20 MHz channels 2x 40 MHz channels 1x 80 MHz channel •  Slightly different rules apply for channel 165 in ISM spectrum Channel Frequency (MHz) US intermediate band (U-NII 2 extended) 5450-5725 MHz 12x 20 MHz channels 6x 40 MHz channels 3x 80 MHz channels 1x 160 MHz channel •  Requires DFS (& TPC if over 500mW / 27dBm EIRP) •  5600-5650 MHz is used by weather radars and is temporarily not available in the U.S. 36 4844 5240 56 6460 Band Edge 5180 5200 5220 5240 5260 5280 5300 5320 5350 Band Edge 5150 100 112108 116104 120 128124 5500 5520 5540 5560 5580 5600 5620 5640 Band Edge 5470 136 140 Band Edge 5680 5700 5725 132 5660 165 5825 144 5720 Band Edge (U-NII)) 5825 © Copyright 2012. Aruba Networks, Inc. All rights reserved
14 Deployment Considerations – RF Planning •  160MHz }  It is unlikely we will see wide adoption of 160MHz channels, but no doubt some special applications will emerge to use this option. •  80MHz }  Five available 80MHz channels (three require DFS) should be sufficient for overlapping access points to provide contiguous coverage •  <80MHz: }  Some networks will have reasons to prefer a higher number of smaller-width channels © Copyright 2012. Aruba Networks, Inc. All rights reserved
15 Modulation •  Adds 256-QAM options with coding of 3/4 and 5/6. •  Compared to 802.11n: 64-QAM 5/6 •  Provides a higher ‘raw data’ top speed •  Higher order modulation leverages advances in radio technology, to better distinguish constellation points •  All the earlier options are still available, used if SNR is too low to sustain the highest rates. Amplitude +1 Amplitude -1 Quadrature-1 Quadrature+1 Amplitude +1 Amplitude -1 Quadrature-1 Quadrature+1 Amplitude +1 Amplitude -1 Quadrature-1 Quadrature+1 16-QAM constellation 64-QAM constellation 256-QAM constellation Constellation diagrams for 16-, 64-, 256-QAM © Copyright 2012. Aruba Networks, Inc. All rights reserved
16 More Spatial Streams •  Up to 8 spatial streams in both single-user (SU) and multi-user (MU) (was 4 max in 802.11n) •  8SS performance will only be possible where both devices have 8 antennas. •  Without innovative antenna designs, this probably precludes handheld devices, but access points, set top boxes and the like will be able to use multiple streams. •  Adding spatial streams increases throughput proportionally. Assuming multipath conditions are favorable, •  Two streams offer double the throughput of a single stream •  Eight streams increase throughput eight-fold © Copyright 2012. Aruba Networks, Inc. All rights reserved
17 11ac Multi-User MIMO •  MIMO: •  802.11n Introduced MIMO (Multiple Input, Multiple Output) spatial division multiplexing for dramatic improvements in data rate •  Multi-User MIMO •  Multiple devices, each with potentially multiple antennas, transmit or receive independent data streams simultaneously •  Requires beamforming techniques to steer signal maxima over the desired clients while minimizing interference at other clients. APclient A client B client C AP client D client C client A Downlink Multi-user MIMO transmission options (examples) client B © Copyright 2012. Aruba Networks, Inc. All rights reserved
18 802.11ac achievable link rates Channel bandwidth Transmit – Receive antennas Modulation and coding etc Typical client scenario Throughput (individual link rate) Throughput (aggregate link rate) 80 MHz 1x1 256-QAM 5/6, short guard interval Smartphone 433 Mbps 433 Mbps 80 MHz 2x2 256-QAM 5/6, short guard interval Tablet, PC 867 Mbps 867 Mbps 160 MHz 1x1 256-QAM 5/6, short guard interval Smartphone 867 Mbps 867 Mbps 160 MHz 2x2 256-QAM 5/6, short guard interval Tablet, PC 1.73 Gbps 1.73 Gbps 160 MHz 4x Tx AP, 4 clients of 1x Rx 256-QAM 5/6, short guard interval Multiple smartphones 867 Mbps per client 3.47 Gbps 160 MHz 8x Tx AP, 4 clients with total of 8x Rx 256-QAM 5/6 , short guard interval Digital TV, set-top box, tablet, PC, smartphone 867 Mbps to two 1x clients 1.73 Gbps to one 2x client 3.47 Gbps to one 4x client 6.93 Gbps 160 MHz 8x Tx AP, 4 clients of 2x Rx 256-QAM 5/6, short guard interval Multiple set-top boxes, PCs 1.73 Gbps to each client 6.93 Gbps © Copyright 2012. Aruba Networks, Inc. All rights reserved
19 802.11ac vs 802.11n 802.11ac enhancement Notes Improvement over current 802.11n Max theoretical improvement over 802.11n 80 MHz, 160MHz channel Over 40MHz in 802.11n (but how often is a 160MHz channel practical?) ~ 2.1x (80MHz) 4.2x (160MHz) 8 Spatial streams Over max 4 spatial streams in 802.11n (but only just seeing 3SS 802.11n in the field) ~ 2x (4SS vs 2SS) 1x (4SS vs 4SS without MU-MIMO) 256-QAM 3/4 and 5/6 modulation Over 64-QAM 5/6 in 802.11n ~ 1.2, 1.33x ~ 1.2, 1.33x Beamforming (implementable BF) No explicit BF in current 802.11n systems due to complexity ~1.5x ~2x Multi-user downlink MIMO Over single-user MIMO in 802.11n ~1.5x ~2x Total improvement ~10x ~20x (estimates only - performance depends on clients, traffic profiles, neighboring WLANs etc.) © Copyright 2012. Aruba Networks, Inc. All rights reserved
20 WFA Industry Certification •  Wi-Fi Alliance – Work is underway for Draft 11ac Certification }  Expected to be available 1H 2013 }  Based on IEEE 802.11ac draft }  Followed by “Final ac” © Copyright 2012. Aruba Networks, Inc. All rights reserved
21 Summary: 11ac – 5GHz VHT •  What 802.11ac Offers: }  Higher bandwidth, enable new applications •  Benefits: }  New Usage Models & Application Environments •  Key Technical Components: }  Significant improvements from wider channels, higher-rate modulation and higher-level MIMO }  Together they offer a top speed that is >10x that of 802.11n •  Certification Status - 2013 © Copyright 2012. Aruba Networks, Inc. All rights reserved
Copyright 2012 – All rights reserved 802.11ac and the Enterprise Craig J. Mathias ⦁ Principal
Topics for Discussion… }  Why demand for Wi-Fi capacity will continue to grow rapidly }  How 802.11ac will change the enterprise wireless LAN }  Evolution, not revolution }  It’s not just about the PHY… }  The continuing importance of architecture and management }  Trends and timelines }  Alternatives for the enterprise now }  Conclusions and recommendations
Wi-Fi Forever }  First a toy, then a tool, now part of the culture – globally! }  No competition from any other wireless technology }  Enterprise, personal, public-space (hotspot and metro-scale) }  Voice, data, video – the mobile Triple Play }  802.11n removed the last barrier for enterprise installations }  All other issues have been addressed for essentially all industries and applications }  Key differentiation in enterprise-class products is in architecture and management }  But AP/radio implementations can still make a big difference! }  Next – gigabit-class WLANs }  802.11ac and ad }  Today’s enterprise goal: capacity, not just coverage or throughput alone }  And reliability and scalability
Wi-Fi as Default/Primary Access Venues, Subscriber Units, Applications Residential Public-Space Enterprise Voice Data Video PC Handset Other Devices and Applications (e.g., M2M) Source: Farpoint Group
Wi-Fi: Key Trends Device Proliferation • Handsets • Notebooks • Tablets • Users with multiple devices Wireless as an Expectation and Requirement • Default/primary access • All venues • All applications – extreme diversity • Staff, customer, and guest use • Social networks, media access • Evolution to gigabit (802.11ac/ad) Increasing Dependence on Wi-Fi • Core driver: convenience • Capacity, not just throughput • Mobile Triple Play • Density: users drive infrastructure • Coverage - everywhere • Complementary to cellular • Cellular offload Source: Farpoint Group
802.11ac – Breaking the Gigabit Barrier <1 Mbps Proprietary 1-2 Mbps 802.11 1997 100% 11 Mbps 802.11b 550% 54 Mbps 802.11g/a 490% 300/450/600 Mbps 802.11n 833% 433/866/1300 Mbps 802.11ac 288% (to 6.93 Gbps) 7-28 Gbps? 802.11ad 538% 1989 1991 1999 2003 2009 2013 2013 Gratuitous clipart - Please ignore Source: Farpoint Group
WLANs – Key Requirements Throughput Minimize TCO CapacityReliability Management and Assurance Scalability Time-Bounded IEEE 802.11n/MIMO To 450 Mbps (three-stream .11n) NB: rate vs. range Next: 802.11ac/ad Traffic Volume Responsiveness Configuration Policies Monitoring Control Integrity Fault-Tolerance Growth Change Flexibility Voice over IP over Wi-Fi (VoFi) and video (VidFi) Current and Future WLANs Security802.11/Wi-Fi IDS/IPS VPNs/802.1X (etc.) CapEx OpEx Location and Tracking Increasing applications ✔ ✔ ✔ ✔ Source: Farpoint Group
It’s Not Really About Throughput – It’s About Capacity Dense Deployments • Maximize channel utilization • Maximize throughput/reliability by minimizing range RF Management Techniques • Beamforming • Beamsteering • Bandsteering • Auto channel/power selection • Spectral analysis Traffic prioritization/Airtime fairness Load balancing Source: Farpoint Group
Architecture Matters: The “Planes” Model of Enterprise WLAN Systems Data Control Management Increasing data rate/ duty cycle • Distributed • Centralized • Capacity • Distributed • Centralized • Hybrid/Adaptive • “OS” – traffic flow • Resource management • Policy Implementation • Centralized • Planning • Configuration • Deployment • Administration • Security • Integrity • Monitoring • Logging, Reporting, Compliance • Troubleshooting • Alerts, Alarms, Exceptions • Assurance Source: Farpoint Group
802.11ac Unknowns 80- and 80x2/160-MHz. Channels • Range, rate vs. range; effective throughput • Increasing interference? • Re-farming current channel plans Evolution • 802.11n backwards-compatible performance • Vendor coexistence/migration strategies • Varying quality of PHY and MAC implementations 5 GHz. Bands • Relatively uncrowded today… • But tomorrow? Source: Farpoint Group
Scalability: Networks (of any form) Only Grow… Number Of Users Traffic Volumes Transmit Duty Cycles Number of Applications Time- Boundedness Coverage/ Scalable Growth Capacity Ever-Growing Demands on Wireless (and wired) Networks ReliabilityTCO/ROI Source: Farpoint Group ✔
802.11ac Adoption Timeline 2013 2015 20182012 Replacement of 802.11n First 802.11ac products First enterprise-class products First embedded products Standard finished Wi-Fi Alliance specification Critical mass – enterprise infrastructure Critical mass – clients Source: Farpoint Group
What Should the Enterprise Do Now? Wired network - audit Coexistence/migration planning with vendor Begin the operations planning process Continue to deploy 802.11n Non-disruptive, gradual upgrade strategy Budgetary analysis Source: Farpoint Group
Conclusions (for now…) }  802.11ac will replace 802.11n – but not for many years }  802.11n projects should continue to be evaluated (and deployed) based on current ROI }  Talk with your vendor about coexistence/ migration plans }  And remember: there’s more to successful WLAN deployments than radios!
36 Questions For more information contact Aruba Networks: info@arubanetworks.com Farpoint Group: craig@farpointgroup.com

More Related Content

082112 aruba 11ac webinar

  • 1. 11 Fact vs. Fiction Gigabit Wi-Fi 802.11ac © Copyright 2012. Aruba Networks, Inc. All rights reserved Dorothy Stanley, Aruba Networks Craig Mathias, Farpoint Group
  • 2. 2 Webinar Overview •  The next major development in wireless LAN technologies – 802.11ac •  Features, benefits, and limitations •  Availability and timelines •  Real-world throughput expectations •  Migration planning, requirements, and related costs •  Gigabit Wi-Fi use cases •  Setting expectations for the enterprise © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 3. 3 Our Speakers for Today Dorothy Stanley Craig Mathias }  Founder (1991) and Principal with Farpoint Group }  Advisory services for wireless and mobile }  Member, IEEE }  Advisory Board Member for Interop, Co-Chair of Mobile Connect, and Analyst Partner at 4G World }  Columns for Information Week and TechTarget }  Blog at Network World }  Head of Standards Strategy, Aruba Networks }  Chair IEEE 802.11v, IEEE 802.11Revmb }  Liaison IEEE 802.11 to IETF }  Vice-chair Wi-Fi Alliance Security Marketing, Security Technical and Wireless Network Management Marketing Task Groups © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 5. 5 11ac Standards Discussion 1.  IEEE P802.11ac – Project Definition, Scope & Schedule 2.  Benefits: Usage Models & Application Environments 3.  Key Technical Components 4.  Summary © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 6. 6 IEEE P802.11ac Basics •  Title: Enhancements for Very High Throughput for operation in bands below 6GHz •  Scope: Modifications to both the 802.11 physical layers (PHY) and the 802.11 Medium Access Control Layer (MAC) }  At least 1 Gbps Multi-station (STA) throughput and a maximum single link throughput of at least 500 Mbps. }  6 GHz below carrier frequency operation excluding 2.4 GHz }  Backward compatible and coexistence with legacy IEEE802.11 devices in the 5 GHz unlicensed band. •  Project Purpose: Significantly higher throughput for existing WLAN application areas and to enable new market segments for operation below 6 GHz including distribution of multiple multimedia/data streams. Source: P802.11ac Project Authorization Request (PAR) © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 7. 7 IEEE Standards Development: Process Flow – 802.11ac 7 Source: https://mentor.ieee.org/802.11/dcn/10/11-10-0617-01-0000-ieee-standards-process-overview.ppt and http://standards.ieee.org/develop/policies/opman/sb_om.pdf Idea Project Approval Process Develop Draft Standard in Working Group Sponsor Ballot IEEE SA Standards Board Approval Publish Standard Standard is Active; can be transferred to Inactive status, reviewed every 10 years Maximum of 4 years, + extensions 2008 Oct 2008 2009-2012 2013 Dec 2013 Early 2014 802.11ac Dates © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 8. 8 An aside: 802.11ad ≠ 802.11ac •  IEEE 802.11ad: }  60GHz specification }  Appropriate for shorter range in-room use cases }  Gigabit data rates }  Expected approval in Dec 2012 © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 9. 9 802.11ac Categories of Usage Wireless Display In Home Distribution of HDTV and other content Rapid Upload/Download of large files to/from server Backhaul Traffic (e.g. Mesh, Point-to-Point) Campus / Auditorium deployments Manufacturing Floor Automation Source: https://mentor.ieee.org/802.11/ dcn/07/11-07-2988-04-0000- liaison-from-wi-fi-alliance-to- 802-11-regarding-wfa-vht- study-group-consolidation-of- usage-models.ppt also see: https://mentor.ieee.org/802.11/ dcn/09/11- 09-0161-02-00ac-802-11ac- usage-model-document.ppt
  • 10. 10 Example: Video requirements Video type Description Rate Packet error rate Jitter Delay Uncompressed 720p (RGB) 1280x720 pixels; 24 bits/pixel, 60 frame/sec 1.3 Gbps 10-8 5 msec 5 msec 1080i (RGB) 1920x1080/2 pixels; 24 bits/pixel, 60 frame/sec 1.5 Gbps 10-8 5 msec 5 msec 1080p (YCrCb) 1920x720 pixel; 24 bits/pixel, 60 frame/sec 1.5 Gbps 10-8 5 msec 5 msec 1080p (RGB) 1920x720 pixel; 24 bits/ pixel, 60 frame/sec 3.0 Gbps 10-8 5 msec 5 msec Lightly Compressed Motion JPEG2000 150 Mbps 10-7 10 msec 10 msec H.264 70 – 200 Mbps 10-7 10-8 20 msec 20 msec Compressed Blu-rayTM 50 Mbps 10-7 20 msec 20 msec HD MPEG2 20 Mbps 3x10-7 20 msec 20 msec © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 11. 11 Key Technical Components 1.  Wider channels: 80 MHz &160 MHz channel bandwidths 2.  New modulation & coding: 256-QAM, rate ¾ and 5/6, added as optional modes 3.  More spatial streams: Up to 8 (had 4 in 802.11n) 4.  Multi-user MIMO (MU-MIMO) Source: IEEE 802.11ac framework document, see https://mentor.ieee.org/802.11/dcn/09/11-09-0992-21-00ac-proposed-specification-framework-for-tgac.doc © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 12. 12 80 MHz and 160 MHz channel bandwidths •  80 MHz mandatory, 160 MHz optional •  80 MHz channels are ‘new’ channels: }  Like two 40 MHz channels but with tones in the middle filled in •  160 MHz channels are defined as two 80 MHz channels }  May be contiguous or non-contiguous © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 13. 13 20/40 and 80/160 Channelization Channels defined for 5 GHz bands (U.S. regulations), showing 20, 40, 80 and 160 MHz channels (channel 144 is now allowed in the U.S. for one additional 20 MHz, one 40 MHz and one 80 MHz channel) Channel Frequency (MHz) US U-NII I and U-NII II bands U-NII I: 5150-5250 MHz (indoors only) U-NII 2: 5250-5350 MHz 8x 20 MHz channels 4x 40 MHz channels 2x 80 MHz channels 1x 160 MHz channel U-NII II requires DFS (& TPC if over 500mW / 27dBm EIRP) 149 161157153 Band Edge (ISM) Channel Frequency (MHz) 5745 5765 5785 5805 5850 Band Edge 5725 US-only U-NII 3 / ISM band 5725-5825 MHz 5x 20 MHz channels 2x 40 MHz channels 1x 80 MHz channel •  Slightly different rules apply for channel 165 in ISM spectrum Channel Frequency (MHz) US intermediate band (U-NII 2 extended) 5450-5725 MHz 12x 20 MHz channels 6x 40 MHz channels 3x 80 MHz channels 1x 160 MHz channel •  Requires DFS (& TPC if over 500mW / 27dBm EIRP) •  5600-5650 MHz is used by weather radars and is temporarily not available in the U.S. 36 4844 5240 56 6460 Band Edge 5180 5200 5220 5240 5260 5280 5300 5320 5350 Band Edge 5150 100 112108 116104 120 128124 5500 5520 5540 5560 5580 5600 5620 5640 Band Edge 5470 136 140 Band Edge 5680 5700 5725 132 5660 165 5825 144 5720 Band Edge (U-NII)) 5825 © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 14. 14 Deployment Considerations – RF Planning •  160MHz }  It is unlikely we will see wide adoption of 160MHz channels, but no doubt some special applications will emerge to use this option. •  80MHz }  Five available 80MHz channels (three require DFS) should be sufficient for overlapping access points to provide contiguous coverage •  <80MHz: }  Some networks will have reasons to prefer a higher number of smaller-width channels © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 15. 15 Modulation •  Adds 256-QAM options with coding of 3/4 and 5/6. •  Compared to 802.11n: 64-QAM 5/6 •  Provides a higher ‘raw data’ top speed •  Higher order modulation leverages advances in radio technology, to better distinguish constellation points •  All the earlier options are still available, used if SNR is too low to sustain the highest rates. Amplitude +1 Amplitude -1 Quadrature-1 Quadrature+1 Amplitude +1 Amplitude -1 Quadrature-1 Quadrature+1 Amplitude +1 Amplitude -1 Quadrature-1 Quadrature+1 16-QAM constellation 64-QAM constellation 256-QAM constellation Constellation diagrams for 16-, 64-, 256-QAM © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 16. 16 More Spatial Streams •  Up to 8 spatial streams in both single-user (SU) and multi-user (MU) (was 4 max in 802.11n) •  8SS performance will only be possible where both devices have 8 antennas. •  Without innovative antenna designs, this probably precludes handheld devices, but access points, set top boxes and the like will be able to use multiple streams. •  Adding spatial streams increases throughput proportionally. Assuming multipath conditions are favorable, •  Two streams offer double the throughput of a single stream •  Eight streams increase throughput eight-fold © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 17. 17 11ac Multi-User MIMO •  MIMO: •  802.11n Introduced MIMO (Multiple Input, Multiple Output) spatial division multiplexing for dramatic improvements in data rate •  Multi-User MIMO •  Multiple devices, each with potentially multiple antennas, transmit or receive independent data streams simultaneously •  Requires beamforming techniques to steer signal maxima over the desired clients while minimizing interference at other clients. APclient A client B client C AP client D client C client A Downlink Multi-user MIMO transmission options (examples) client B © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 18. 18 802.11ac achievable link rates Channel bandwidth Transmit – Receive antennas Modulation and coding etc Typical client scenario Throughput (individual link rate) Throughput (aggregate link rate) 80 MHz 1x1 256-QAM 5/6, short guard interval Smartphone 433 Mbps 433 Mbps 80 MHz 2x2 256-QAM 5/6, short guard interval Tablet, PC 867 Mbps 867 Mbps 160 MHz 1x1 256-QAM 5/6, short guard interval Smartphone 867 Mbps 867 Mbps 160 MHz 2x2 256-QAM 5/6, short guard interval Tablet, PC 1.73 Gbps 1.73 Gbps 160 MHz 4x Tx AP, 4 clients of 1x Rx 256-QAM 5/6, short guard interval Multiple smartphones 867 Mbps per client 3.47 Gbps 160 MHz 8x Tx AP, 4 clients with total of 8x Rx 256-QAM 5/6 , short guard interval Digital TV, set-top box, tablet, PC, smartphone 867 Mbps to two 1x clients 1.73 Gbps to one 2x client 3.47 Gbps to one 4x client 6.93 Gbps 160 MHz 8x Tx AP, 4 clients of 2x Rx 256-QAM 5/6, short guard interval Multiple set-top boxes, PCs 1.73 Gbps to each client 6.93 Gbps © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 19. 19 802.11ac vs 802.11n 802.11ac enhancement Notes Improvement over current 802.11n Max theoretical improvement over 802.11n 80 MHz, 160MHz channel Over 40MHz in 802.11n (but how often is a 160MHz channel practical?) ~ 2.1x (80MHz) 4.2x (160MHz) 8 Spatial streams Over max 4 spatial streams in 802.11n (but only just seeing 3SS 802.11n in the field) ~ 2x (4SS vs 2SS) 1x (4SS vs 4SS without MU-MIMO) 256-QAM 3/4 and 5/6 modulation Over 64-QAM 5/6 in 802.11n ~ 1.2, 1.33x ~ 1.2, 1.33x Beamforming (implementable BF) No explicit BF in current 802.11n systems due to complexity ~1.5x ~2x Multi-user downlink MIMO Over single-user MIMO in 802.11n ~1.5x ~2x Total improvement ~10x ~20x (estimates only - performance depends on clients, traffic profiles, neighboring WLANs etc.) © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 20. 20 WFA Industry Certification •  Wi-Fi Alliance – Work is underway for Draft 11ac Certification }  Expected to be available 1H 2013 }  Based on IEEE 802.11ac draft }  Followed by “Final ac” © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 21. 21 Summary: 11ac – 5GHz VHT •  What 802.11ac Offers: }  Higher bandwidth, enable new applications •  Benefits: }  New Usage Models & Application Environments •  Key Technical Components: }  Significant improvements from wider channels, higher-rate modulation and higher-level MIMO }  Together they offer a top speed that is >10x that of 802.11n •  Certification Status - 2013 © Copyright 2012. Aruba Networks, Inc. All rights reserved
  • 22. Copyright 2012 – All rights reserved 802.11ac and the Enterprise Craig J. Mathias ⦁ Principal
  • 23. Topics for Discussion… }  Why demand for Wi-Fi capacity will continue to grow rapidly }  How 802.11ac will change the enterprise wireless LAN }  Evolution, not revolution }  It’s not just about the PHY… }  The continuing importance of architecture and management }  Trends and timelines }  Alternatives for the enterprise now }  Conclusions and recommendations
  • 24. Wi-Fi Forever }  First a toy, then a tool, now part of the culture – globally! }  No competition from any other wireless technology }  Enterprise, personal, public-space (hotspot and metro-scale) }  Voice, data, video – the mobile Triple Play }  802.11n removed the last barrier for enterprise installations }  All other issues have been addressed for essentially all industries and applications }  Key differentiation in enterprise-class products is in architecture and management }  But AP/radio implementations can still make a big difference! }  Next – gigabit-class WLANs }  802.11ac and ad }  Today’s enterprise goal: capacity, not just coverage or throughput alone }  And reliability and scalability
  • 25. Wi-Fi as Default/Primary Access Venues, Subscriber Units, Applications Residential Public-Space Enterprise Voice Data Video PC Handset Other Devices and Applications (e.g., M2M) Source: Farpoint Group
  • 26. Wi-Fi: Key Trends Device Proliferation • Handsets • Notebooks • Tablets • Users with multiple devices Wireless as an Expectation and Requirement • Default/primary access • All venues • All applications – extreme diversity • Staff, customer, and guest use • Social networks, media access • Evolution to gigabit (802.11ac/ad) Increasing Dependence on Wi-Fi • Core driver: convenience • Capacity, not just throughput • Mobile Triple Play • Density: users drive infrastructure • Coverage - everywhere • Complementary to cellular • Cellular offload Source: Farpoint Group
  • 27. 802.11ac – Breaking the Gigabit Barrier <1 Mbps Proprietary 1-2 Mbps 802.11 1997 100% 11 Mbps 802.11b 550% 54 Mbps 802.11g/a 490% 300/450/600 Mbps 802.11n 833% 433/866/1300 Mbps 802.11ac 288% (to 6.93 Gbps) 7-28 Gbps? 802.11ad 538% 1989 1991 1999 2003 2009 2013 2013 Gratuitous clipart - Please ignore Source: Farpoint Group
  • 28. WLANs – Key Requirements Throughput Minimize TCO CapacityReliability Management and Assurance Scalability Time-Bounded IEEE 802.11n/MIMO To 450 Mbps (three-stream .11n) NB: rate vs. range Next: 802.11ac/ad Traffic Volume Responsiveness Configuration Policies Monitoring Control Integrity Fault-Tolerance Growth Change Flexibility Voice over IP over Wi-Fi (VoFi) and video (VidFi) Current and Future WLANs Security802.11/Wi-Fi IDS/IPS VPNs/802.1X (etc.) CapEx OpEx Location and Tracking Increasing applications ✔ ✔ ✔ ✔ Source: Farpoint Group
  • 29. It’s Not Really About Throughput – It’s About Capacity Dense Deployments • Maximize channel utilization • Maximize throughput/reliability by minimizing range RF Management Techniques • Beamforming • Beamsteering • Bandsteering • Auto channel/power selection • Spectral analysis Traffic prioritization/Airtime fairness Load balancing Source: Farpoint Group
  • 30. Architecture Matters: The “Planes” Model of Enterprise WLAN Systems Data Control Management Increasing data rate/ duty cycle • Distributed • Centralized • Capacity • Distributed • Centralized • Hybrid/Adaptive • “OS” – traffic flow • Resource management • Policy Implementation • Centralized • Planning • Configuration • Deployment • Administration • Security • Integrity • Monitoring • Logging, Reporting, Compliance • Troubleshooting • Alerts, Alarms, Exceptions • Assurance Source: Farpoint Group
  • 31. 802.11ac Unknowns 80- and 80x2/160-MHz. Channels • Range, rate vs. range; effective throughput • Increasing interference? • Re-farming current channel plans Evolution • 802.11n backwards-compatible performance • Vendor coexistence/migration strategies • Varying quality of PHY and MAC implementations 5 GHz. Bands • Relatively uncrowded today… • But tomorrow? Source: Farpoint Group
  • 32. Scalability: Networks (of any form) Only Grow… Number Of Users Traffic Volumes Transmit Duty Cycles Number of Applications Time- Boundedness Coverage/ Scalable Growth Capacity Ever-Growing Demands on Wireless (and wired) Networks ReliabilityTCO/ROI Source: Farpoint Group ✔
  • 33. 802.11ac Adoption Timeline 2013 2015 20182012 Replacement of 802.11n First 802.11ac products First enterprise-class products First embedded products Standard finished Wi-Fi Alliance specification Critical mass – enterprise infrastructure Critical mass – clients Source: Farpoint Group
  • 34. What Should the Enterprise Do Now? Wired network - audit Coexistence/migration planning with vendor Begin the operations planning process Continue to deploy 802.11n Non-disruptive, gradual upgrade strategy Budgetary analysis Source: Farpoint Group
  • 35. Conclusions (for now…) }  802.11ac will replace 802.11n – but not for many years }  802.11n projects should continue to be evaluated (and deployed) based on current ROI }  Talk with your vendor about coexistence/ migration plans }  And remember: there’s more to successful WLAN deployments than radios!
  • 36. 36 Questions For more information contact Aruba Networks: info@arubanetworks.com Farpoint Group: craig@farpointgroup.com