Response to 802.15.3c Questions April 2007 doc.: IEEE 802.11-07/0570r0 June 2008 Response to 802.15.3c Questions Date: 2008-06-19 Authors: Eldad Perahia, Intel Corporation Eldad Perahia, Intel Corporation

April 2007 doc.: IEEE 802.11-07/0570r0 June 2008 Abstract Individual response to 802.15.3c questions (not VHT SG official position) Eldad Perahia, Intel Corporation Eldad Perahia, Intel Corporation

Questions posed by 802.15.3c to VHT April 2007 doc.: IEEE 802.11-07/0570r0 June 2008 Questions posed by 802.15.3c to VHT Click on link below for embedded file of 802.15.3c questions Eldad Perahia, Intel Corporation Eldad Perahia, Intel Corporation

Question 1: Coexistence April 2007 doc.: IEEE 802.11-07/0570r0 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: https://mentor.ieee.org/802.11/file/08/11-08-0223-05-0vht-proposal-for-60ghz-vht-par.doc Eldad Perahia, Intel Corporation Eldad Perahia, Intel Corporation

Question 2: Channelization April 2007 doc.: IEEE 802.11-07/0570r0 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

April 2007 doc.: IEEE 802.11-07/0570r0 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

April 2007 doc.: IEEE 802.11-07/0570r0 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 802.15.3c 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 802.15.3c 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: https://mentor.ieee.org/802.11/file/08/11-08-0364-01-0vht-wlan-overlay-with-60ghz-channels.ppt Eldad Perahia, Intel Corporation Eldad Perahia, Intel Corporation

Question 5: Applications April 2007 doc.: IEEE 802.11-07/0570r0 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: https://mentor.ieee.org/802.11/file/07/11-07-2587-00-0vht-vht-applications.ppt https://mentor.ieee.org/802.11/file/07/11-07-2988-04-0000-liaison-from-wi-fi-alliance-to-802-11-regarding-wfa-vht-study-group-consolidation-of-usage-models.ppt https://mentor.ieee.org/802.11/file/08/11-08-0130-01-0vht-vht-par-direction.ppt https://mentor.ieee.org/802.11/file/08/11-08-0451-00-0vht-mapping-wfa-usage-models-to-operating-bands.ppt Eldad Perahia, Intel Corporation Eldad Perahia, Intel Corporation

Question 6: Channel models April 2007 doc.: IEEE 802.11-07/0570r0 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 802.15.3c 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: https://mentor.ieee.org/802.11/file/07/11-07-2605-00-0vht-vht-options.ppt https://mentor.ieee.org/802.11/file/07/11-07-2790-00-0vht-what-is-happening-in-60-ghz.ppt https://mentor.ieee.org/802.11/file/07/11-07-2793-00-0vht-60ghz-vs-5ghz-propagation-discussion.ppt https://mentor.ieee.org/802.11/file/08/11-08-0632-00-0vht-60ghz-channel-model-recommendation.ppt Eldad Perahia, Intel Corporation Eldad Perahia, Intel Corporation

Question 7: Sub-channels April 2007 doc.: IEEE 802.11-07/0570r0 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

Question 8: Dual band operation April 2007 doc.: IEEE 802.11-07/0570r0 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: https://mentor.ieee.org/802.11/file/07/11-07-2780-01-0vht-multi-band-modulation-coding-and-medium-access-control.ppt https://mentor.ieee.org/802.11/file/08/11-08-0130-01-0vht-vht-par-direction.ppt https://mentor.ieee.org/802.11/file/08/11-08-0364-01-0vht-wlan-overlay-with-60ghz-channels.ppt https://mentor.ieee.org/802.11/file/08/11-08-0349-01-0vht-potential-benefits-of-dual-radio-vht-systems.ppt https://mentor.ieee.org/802.11/file/08/11-08-0498-00-0vht-modified-60ghz-par.ppt Eldad Perahia, Intel Corporation Eldad Perahia, Intel Corporation

Question 9: Data packet transmission April 2007 doc.: IEEE 802.11-07/0570r0 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