July 2008
doc.: IEEE 802.11-08/0813r1
VHT SG Report to EC
Date: 2008-07-14
Authors:
Name
Company
Address
Phone
email
Bruce Kraemer
Marvell
5488 Marvell Lane,
Santa Clara, CA, 95054
321-427-4098
bkraemer@ marvell.com
Eldad Perahia
Intel
Corporation
2111 NE 25th Ave
Hillsboro, OR 97124
503-712-8081
eldad.perahia@intel.com
Submission
Slide 1
Eldad Perahia, Intel Corporation
July 2008
doc.: IEEE 802.11-08/0813r1
Overview
•
IEEE 802.11 VHT SG is proposing two PARs both of which will result in MAC and
PHY modifications to 802.11
–
–
–
Amendment to 802.11 in bands <6 GHz
Amendment to 802.11 in the 60 GHz band
Both task groups will modify the 802.11 MAC with changes to the channel access mechanism
specific to their PHY and operating band
•
•
•
Both PARs propose to increase the throughput of 802.11 beyond that of 802.11n
–
–
•
Orthogonal frequency division multiple access and spatial division multiple access for <6 GHz
Directional antennas in 60 GHz
1 Gbps multi-station throughput in <6 GHz band
1 Gbps single link throughput in 60 GHz
Applications discussed in the study group include (many are enhancements of
802.11n applications)
–
From Wi-Fi Alliance liaison report (https://mentor.ieee.org/802.11/file/07/11-07-2988-04-0000liaison-from-wi-fi-alliance-to-802-11-regarding-wfa-vht-study-group-consolidation-of-usagemodels.ppt):
•
•
•
•
•
•
–
Usage models from other submissions:
•
Submission
Wireless Display
In Home Distribution of HDTV and other content
Rapid Upload and Download of large files to/from server
Backhaul Traffic (e.g. Mesh, Point-to-Point)
Campus / Auditorium deployments
Manufacturing Floor Automation
High speed cable replacement (HDMI, monitor), wireless docking, sync and go, wireless local area
networking, IMT-Advanced
Slide 2
Eldad Perahia, Intel Corporation
July 2008
doc.: IEEE 802.11-08/0813r1
<6 GHz PAR
• Enhance network capacity to at least 1 Gbps by
emphasizing multi-station throughput in scope
– Techniques discussed in the study group include orthogonal
frequency division multiple access and spatial division multiple
access
• Single link throughput of at least 500 Mbps
– Theoretically capable with 802.11, but requires four antennas and
40 MHz
– 80 MHz channel discussed in study group to enable 500 Mbps with
only two antennas for handheld devices
• PAR scope specifically excludes 2.4 GHz from bands
under consideration
Submission
Slide 3
Eldad Perahia, Intel Corporation
July 2008
doc.: IEEE 802.11-08/0813r1
60 GHz PAR
•
•
The 60 GHz ISM band provides the opportunity for much wider band channels
than in <6 GHz enabling single link throughputs greater than 1 Gbps
Two aspects of the PAR ensure distinct identity from 802.15.3c
–
–
•
Fast session transfer provides seamless rate fall back between VHT and 802.11n for
multi-band devices
–
•
Enable fast session transfer between PHYs
Maintain the 802.11 user experience (as explained in the Additional Explanatory Notes)
Provides expected WLAN coverage from combo 60 + 2.4/5 GHz devices
As an amendment to 802.11, VHT maintains the 802.11 user experience
–
maintaining the network architecture of the 802.11 system
•
–
Reuse and maintain backward compatibility to 802.11 management plane
•
•
E.g. infrastructure basic service set, extended service set, access point, station
E.g. association, authentication, security, measurement, capability exchange, MIB
Coexistence
–
–
Submission
Coexistence of various systems in the 60 GHz band is an important issue to VHT demonstrated
by being explicitly called out in the PAR scope
Furthermore, the task group will produce a coexistence assurance document
Slide 4
Eldad Perahia, Intel Corporation
July 2008
doc.: IEEE 802.11-08/0813r1
Links to PARs and 5Cs and Response
• <6 GHz
– https://mentor.ieee.org/802.11/file/08/11-08-0807-03-0vht-below6-ghz-par-nescom-form-plus-5cs.doc
• 60 GHz
– https://mentor.ieee.org/802.11/file/08/11-08-0806-03-0vht-60-ghzpar-nescom-form-plus-5cs.doc
• Response to feedback
– https://mentor.ieee.org/802.11/file/08/11-08-0880-01-0vht-reponseto-official-comments.ppt
Submission
Slide 5
Eldad Perahia, Intel Corporation