1. Response to 802.15.3c Questions
April 2007
doc.: IEEE /0570r0
June 2008
Response to c Questions
Date:
Authors:
Eldad Perahia, Intel Corporation
Eldad Perahia, Intel Corporation

2. April 2007
doc.: IEEE /0570r0
June 2008
Abstract
Individual response to c questions (not VHT SG official position)
Eldad Perahia, Intel Corporation
Eldad Perahia, Intel Corporation

3. Questions posed by 802.15.3c to VHT
April 2007
doc.: IEEE /0570r0
June 2008
Questions posed by c to VHT
Click on link below for embedded file of c questions
Eldad Perahia, Intel Corporation
Eldad Perahia, Intel Corporation

4. Question 1: Coexistence
April 2007
doc.: IEEE /0570r0
June 2008
Question 1: Coexistence
How does VHT60 ensure coexistence with other systems in the 60 GHz band?
Response
Coexistence of various systems in the 60 GHz band is an important issue to VHT60
The VHT60 PAR Scope proposal specifically calls out coexistence:
“Address coexistence with other systems in the band”
With further elaboration in the Additional Explanatory Notes:
“It is in the best interest of users and the industry to strive for a level of coexistence between wireless systems. VHT will investigate coexistence with other systems in the 60 GHz band.”
To the best of my recollection, there has been no discussion in VHT regarding a specific approach
VHT 60 GHz PAR and 5C’s:
Eldad Perahia, Intel Corporation
Eldad Perahia, Intel Corporation

5. Question 2: Channelization
April 2007
doc.: IEEE /0570r0
June 2008
Question 2: Channelization
What channel plan does VHT60 have? The same channel plan defined in TG3C (2160 MHz per channel and 4 channels over 9 GHz) or different?
Response:
To the best of my recollection, there has been no discussion in VHT regarding this specific topic
Eldad Perahia, Intel Corporation
Eldad Perahia, Intel Corporation

6. April 2007
doc.: IEEE /0570r0
June 2008
Question 3: Common rate
Does VHT60 plan to support the common rate (CR) defined in TG3C?
Response:
To the best of my recollection, there has been no discussion in VHT regarding this specific topic
Eldad Perahia, Intel Corporation
Eldad Perahia, Intel Corporation

7. April 2007
doc.: IEEE /0570r0
June 2008
Question 4: PHY
Does VHT60 plan to reuse the 15.3c PHY or to define new PHY?
Response:
There has been some discussion on this topic, with the submission below proposing to use c as the VHT60 PHY
Some comments in response to the submission were:
15.3c has 3 PHYs modes and no approved draft, how does VHT coordinate?
Does 15.3c support carrier sense? What kind of changes to dot11 MAC will be required to support a dot15 PHY that may not support carrier sense?
Would it be reasonable to wait until PHY is defined in c before mandating use of their PHY?
Why not wait to bring this concept to the table until after VHT PAR has been approved?
Related submission:
Eldad Perahia, Intel Corporation
Eldad Perahia, Intel Corporation

8. Question 5: Applications
April 2007
doc.: IEEE /0570r0
June 2008
Question 5: Applications
Does VHT60 plan to define new applications and usage models other than what defined in TG3c?
Response:
Proposed VHT Usage models (covering both <6 GHz and 60 GHz):
WFA proposed usage model categories:
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
There was an individual attempt to map the WFA usage models to operating bands, but no official VHT position
Other proposed usage models:
High speed cable replacement (HDMI, monitor)
Wireless docking
Sync and Go
Wireless local area networking
Related submissions:
Eldad Perahia, Intel Corporation
Eldad Perahia, Intel Corporation

9. Question 6: Channel models
April 2007
doc.: IEEE /0570r0
June 2008
Question 6: Channel models
Does VHT60 plan to work on channel models for the applications defined newly?
Response
There was an initial discussion on developing channel models during a conference call on January 31, 2008
There was a suggestion to start with the c models and also to look at the 60 GHz EU project IST-broadway
There have been several follow-on submissions outlining the following issues
NLOS delay profile
NLOS pathloss model
Beamforming - AoA and AoD properties
Gain reduction factor
Human Body Blockage Effects
Related submissions:
Eldad Perahia, Intel Corporation
Eldad Perahia, Intel Corporation

10. Question 7: Sub-channels
April 2007
doc.: IEEE /0570r0
June 2008
Question 7: Sub-channels
Does VHT have any plan to have sub-channels which have much lower channel bandwidth than 2160 MHz?
Response:
To the best of my recollection, there has been no discussion in VHT regarding this specific topic
Eldad Perahia, Intel Corporation
Eldad Perahia, Intel Corporation

11. Question 8: Dual band operation
April 2007
doc.: IEEE /0570r0
June 2008
Question 8: Dual band operation
Does VHT have any plan to have dual band operation: one is at 60 GHz band and the other in lower than 6 GHz?
Response:
The VHT60 PAR scope proposal specifically calls out multiple PHY operation:
“Enable fast session transfer between PHYs”
With further elaboration in the Additional Explanatory Notes:
“Fast session transfer between 60 GHz and 2.4/5 GHz bands will enable typical WLAN coverage for multi-band devices. However, this does not imply that devices must be multi-band. The amendment will specify a mechanism for multi-band devices.”
Various concepts discussed
Split PHY preamble between <6GHz and 60 GHz
Use 11n as a rate fall back to 60 GHz
Use 11n and 60 GHz in an over-lay/under-lay topology to provide typical WLAN coverage
Use MAC extensions to route appropriate traffic to 60 GHz
Related submissions:
Eldad Perahia, Intel Corporation
Eldad Perahia, Intel Corporation

12. Question 9: Data packet transmission
April 2007
doc.: IEEE /0570r0
June 2008
Question 9: Data packet transmission
Does VHT60 plan to have a designated packet transmission mode but not independent PHY mode supporting video streaming?
Response:
To the best of my recollection, there has been no discussion in VHT regarding this specific topic
Eldad Perahia, Intel Corporation
Eldad Perahia, Intel Corporation