doc.: IEEE /0724r1 Submission May 2007 Darwin Engwer, Nortel NetworksSlide 1 VHT Study Group Thoughts Notice: This document has been prepared to assist IEEE It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE Working Group. If you have questions, contact the IEEE Patent Committee Administrator at. Date: Authors:

doc.: IEEE /0724r1 Submission May 2007 Darwin Engwer, Nortel NetworksSlide 2 Abstract Some thoughts on the new “Very High Throughput” Study Group.

doc.: IEEE /0724r1 Submission May 2007 Darwin Engwer, Nortel NetworksSlide 3 Outline Naming the activity Possible Approaches Possible Process Possible Timelines Possible Technologies

doc.: IEEE /0724r1 Submission May 2007 Darwin Engwer, Nortel NetworksSlide 4 Naming the Activity The operating name of this activity is important The name guides the effort “Very High Throughput” is too vague and is a relative term My objective in catalyzing the formation of this group was to move beyond Mbps and into the Gbps era, in order to support the transition of the next set of applications from non-wireless medium to wireless Hence I favor a name that reflects that objective, e.g. “gigabit wireless”, or some such terminology

doc.: IEEE /0724r1 Submission May 2007 Darwin Engwer, Nortel NetworksSlide 5 Possible Approaches (1/2) Amendment to existing standard, or New Series? –Amendment to , or –A NEW standard – a whole new series of Amendment –An amendment would be built-upon but limited-by current standard –Backwards compatibility would need to be built-in and automatic, in the same way that 11g is backwards compatible with 11b and 2.4 GHz 11n is backwards compatible with 11b/g, i.e. new implementations must include mechanisms to directly decode/ encode existing frames. New Series –Opens up the field (both MAC and PHY) to the best technologies –NO limits, e.g. could operate in new bands –Backwards compatibility can be achieved by including an existing a/b/g/n chip in the same device along with the new, [Series 2] Gigabit Technology. –I like this approach, but there are complications …

doc.: IEEE /0724r1 Submission May 2007 Darwin Engwer, Nortel NetworksSlide 6 Possible Approaches (2/2) The New Series approach opens up the field and allows us to explore options that would not otherwise be available to us if we must constrain the technology to directly recognize existing PHY frames in the air. But, how do we prevent a whole new series from requiring redevelopment of all aspects of the WLAN, including security, QOS, measurements, management and so on? Hence, the overall approach remains an open question for discussion – one that is very important and worthy of careful consideration.

doc.: IEEE /0724r1 Submission May 2007 Darwin Engwer, Nortel NetworksSlide 7 Possible Process Begin high level discussions around new research and technologies that can be brought to bear on the problem - careful to not go too deep too soon. –i.e. apply a process of successive refinement - start broad and gradually narrow the scope over time. See for a high level enumerated list of the suggestions that were sent to me via . For example, I suggest we defer deciding on a band of operation until we see some early feasibility studies of what’s possible in the various bands that are available. I suggest that we encourage submission of a few feasibility study type presentations to start to get an idea of the technology or research that can be brought to bear on the subject.

doc.: IEEE /0724r1 Submission May 2007 Darwin Engwer, Nortel NetworksSlide 8 Possible Timelines Possibility #1 - Aggressive –2007 May-Sept SG - construct PAR+5G –2007 Nov - TG formed –2008 comparison criteria/ CFP/ technical proposal submissions –2009 technology selection –2010 refinement/ review –2011 official standard Possibility #2 – More realistic(?) –2007 May-Sept SG - construct PAR+5G –2007 Nov - TG formed –2008 usage models/ comparison criteria/ CFP/ technical proposal submissions –2009 technology selection –2010 refinement –2011 Nov – start external review (sponsor ballot) –2012 Nov - official standard

doc.: IEEE /0724r1 Submission May 2007 Darwin Engwer, Nortel NetworksSlide 9 Possible Technologies I suggest that we look beyond just more antennas, wider channels, more complex modulation and more streams (although those are always good base technologies to bring to bear) to even more advanced technologies, e.g. –Carbon nanotube antenna arrays –Network coding –FEC –New bands –Superposition coding –Advanced interference cancellation –and so on …

doc.: IEEE /0724r1 Submission May 2007 Darwin Engwer, Nortel NetworksSlide 10 References wng-looking-ahead-to-future.ppt very-high-throughput-study-group.ppt draft-par-and-5criteria-gigabit-tg.doc vht-sg-approach-proposal.ppt vht-thoughts-vht.ppt vht-vht-sg-considerations.ppt