Doc.: IEEE 802.11-08/1392r0 Submission November 12, 2008 De Vegt (Qualcomm)Slide 1 Inputs for a VHT Selection Procedure Date: 2008-11-10Authors:

November 12, 2008

De Vegt (Qualcomm)Slide 1

doc.: IEEE 802.11-08/1392r0

Submission

Inputs for a VHT Selection Procedure

Date: 2008-11-10

Name Affiliations Address Phone email Rolf de Vegt Qualcomm, Inc., 3105 Kifer Road,

Santa Clara, CA 650 533 9545 [email protected]

m John Benko Orange, France

Telecom 801 Gateway Blvd, Suite 500, San Francisco, CA

650 875 1593 [email protected]

Philipe Chambelin Thomson 1, av. De Belle Fontaine, Cesson-Sevigne, France

+33 2 99 27 71 76

[email protected]

Darwin Engwer Nortel Networks 4655 Great America Parkway, Santa Clara, CA 95954

408-495-2588 [email protected]

Authors:

November 12, 2008

De Vegt (Qualcomm)Slide 2

doc.: IEEE 802.11-08/1392r0

Submission

Inputs for a VHT Selection Procedure

Submission for the November 2008 IEEE Joint 802.11 VHT Group Meeting in

Dallas, TX

November 12, 2008

De Vegt (Qualcomm)Slide 3

doc.: IEEE 802.11-08/1392r0

Submission

Abstract

This submission provides an overview of the Selection Procedure followed by Taskgroup 802.11n

A strawmodel for a Selection Procedure based on an alternative, ‘Organic’ proposal development process is presented

November 12, 2008

De Vegt (Qualcomm)Slide 4

doc.: IEEE 802.11-08/1392r0

Submission

Topics

1. Context and Introduction2. Overview 802.11n Selection Procedure3. Recap Alterative Proposal Development Process4. Implications for Selection Procedure5. Proposed Next Steps

November 12, 2008

De Vegt (Qualcomm)Slide 5

doc.: IEEE 802.11-08/1392r0

Submission

Context and Introduction

• The 802.11 VHT Taskgroups will have to develop a Selection Procedure for their respective proposals

• The Selection Process followed for 802.11n was the cause of significant delays

• Purpose of this document is:– Provide a recap of the 802.11n selection process

– Provide a recap of an alternative Proposal Development Process

– Highlight the implications for an 802.11VHT Selection Procedure and present a strawmodel of a Selection Procedure for VHT Taskgroups

– Propose a set of next steps

November 12, 2008

De Vegt (Qualcomm)Slide 6

doc.: IEEE 802.11-08/1392r0

Submission

Topics

1. Context and Introduction2. Overview 802.11n Selection Procedure3. Recap Alterative Proposal Development Process4. Implications for Selection Procedure5. Proposed Next Steps

November 12, 2008

De Vegt (Qualcomm)Slide 7

doc.: IEEE 802.11-08/1392r0

Submission

Recap .11n Selection Procedure

• In the case of .11n Multiple Documents were created in preparation for the call for proposals and downselect process:– Usage Models (IEEE802.11-03/0802r23)

– Functional Requirements (IEEE802.11-03/0813r13)

– Channel Models (IEEE802.11-03/0940r4)

– Comparison Criteria (IEEE802.11-03/814r31)

– Selection Procedure (IEEE802.11-03/665r8)

November 12, 2008

De Vegt (Qualcomm)Slide 8

doc.: IEEE 802.11-08/1392r0

Submission

Example Functional Requirements

5 .11g backwards compatibility If it supports 2.4 GHz operation, some of the modes of operation defined in the proposal shall be backwards compatible with 802.11g.

6 Control of support for legacy STA from .11n AP

A .11n AP can be configured to reject or accept associations from legacy STA because they are legacy STA.

7 .11e QoS support The proposal shall permit implementation of the 802.11e ammendment within a .11n STA

8 Spectral Efficiency The highest throughput mode of the proposal shall achieve a spectral efficiency of at least 3 bps/Hz for the PSDU

9 Compliance to PAR The proposal complies with all the mandatory requirements of the PAR [5] and 5 Criteria [6]

Name Requirement

November 12, 2008

De Vegt (Qualcomm)Slide 9

doc.: IEEE 802.11-08/1392r0

Submission

Example Comparison Criteria

CC51 Data rates A list of PHY layer data rates, and for each data rate, specify the used modulation techniques, number of Tx antennas, coding rate and bandwidth. Specify which of the rates are mandatory and which are optional. For adaptive rate proposals, specify the range of achievable rates or, if possible, state the achievable rates in a closed form expression.

None required

Mandatory Text list of rates supported, each marked mandatory or optional

CC42 Preambles Specify the proposed preambles. Summarize the important properties of each part the proposed preambles. Include references to the sections in the technical proposal document where the complete details are given. Specify how the use of any new preamble affects reception by legacy STA.

None required Mandatory Reference to section in technical specificatio defining preambles. For each preamble type supported: Mean and std of peak to sidelobe ratio of the autocorrelation function PAPR values. Description and evaluation of cross-correlation properties.

1.1.1 Channelization CC51.5 Channelization Specify the channelization – i.e. the adjacent

channel spacing. None required Mandatory Minimum channel

spacing for all operational modes

Name Definition

Simulation Scenario /ImpairementStatus Notes

Mand /Optional Disclosure

November 12, 2008

De Vegt (Qualcomm)Slide 10

doc.: IEEE 802.11-08/1392r0

Submission

.11n Selection Procedure

Usage Models

Channel Models

Functional Requirements

ComparisonCriteria

Call for Proposals

Step 2 Next Slide

November 12, 2008

De Vegt (Qualcomm)Slide 11

doc.: IEEE 802.11-08/1392r0

Submission

.11n Selection Procedure [Step 2]

Initial set of 1hrproposal

presentations/discussions

[Step 3]Initial elimination

v ote (> 20%)

[Steps 4&5]Technical

changes / merging

[Step 7]Conduct

elimination v ote (1proposal elim)

One proposallef t?

Y

N

[Step 8]Conduct roll call

conf irmation v ote

75%??Y

[Step 8]“No” v otes

reasons stated

[Step 6]60 minute

presentations

Y

N

Note: Steps 1, 5 and parts of 7relativ e to merging are

combined into a modif ied step 5

[Step 10]Down-selection

complete

[Step 8]Proposer

responds to “No”v otes reasons

[Step 8]Conduct roll call

conf irmation v ote

75%??[Step 9]

Bring back last 3proposals

YNFlowchart based on 03/041r1

C. Brabenac, 13Jan2003

75%?

November 12, 2008

De Vegt (Qualcomm)Slide 12

doc.: IEEE 802.11-08/1392r0

Submission

Topics

1. Context and Introduction2. Overview 802.11n Selection Procedure3. Recap Alterative Proposal Development Process4. Implications for Selection Procedure5. Proposed Next Steps

November 12, 2008

De Vegt (Qualcomm)Slide 13

doc.: IEEE 802.11-08/1392r0

Submission

Outline of an Alternative Process*

1. Taskgroup develops consensus around a framework for spec elements• Aim is to achieve consensus, potentially using simple majority voting when

needed• See next slides for examples from .11n• Taskgroup votes to approve a document that describes all spec elements,

with the intent that this solidifies the scope of the new specification

2. Participants create proposals for one or more spec elements

• Could in theory cover all Spec Elements (i.e. ‘Complete Proposal’) but not necessarily

3. Once the Taskgroup has a coherent enough solution for all spec elements, a vote takes place to send the draft spec out for Letterballot

* Proposal Outlined in document 08/0579r1

November 12, 2008

De Vegt (Qualcomm)Slide 14

doc.: IEEE 802.11-08/1392r0

Submission

Example of Framework for Spec Elements (.11n PHY)

Encoder Puncturer Parser InterleaverInterleaver QAMMapper

QAMMapper

AntennaMapper

iFFTiFFT Window& GI

Window& GI RFRF

Pilo

t

Prea

mbl

e

Agreed uponUnder discussion

IllustrativeIllustrative

November 12, 2008

De Vegt (Qualcomm)Slide 15

doc.: IEEE 802.11-08/1392r0

Submission

PSDU Aggregation

Link Adaptation

Block Ack

EPP(PLCP

spoofing)

Reverse Direction Data flow

Coexistence

HT Control Field

Capabilities

Convergence Emerging

Under Discussion

In the pipeline

Key:

Extended Range

Completed

Power-Save Multi-poll

PSAD/MMP

MSDU Aggregation

EIFS

Example of Framework for Spec Elements (.11n MAC) IllustrativeIllustrative

November 12, 2008

De Vegt (Qualcomm)Slide 16

doc.: IEEE 802.11-08/1392r0

Submission

Key Benefits of Proposed Approach

• Emphasis on consensus building

• Technology selection based on technical merits

• Fair and balanced consideration of which elements to include in the spec

• Equal access for all participants to contribute technically sound elements to the specification

• Decision process favors a single solution for a problem over multiple alternative solutions

November 12, 2008

De Vegt (Qualcomm)Slide 17

doc.: IEEE 802.11-08/1392r0

Submission

Topics

1. Context and Introduction2. Overview 802.11n Selection Procedure3. Recap Alterative Proposal Development Process4. Implications for Selection Procedure5. Proposed Next Steps

November 12, 2008

De Vegt (Qualcomm)Slide 18

doc.: IEEE 802.11-08/1392r0

Submission

Impacts of ‘Organic Proposal Development Process on Selection Procedure’

• Emphasis on developing and creating consensus around a Spec Framework

• Functional Requirements document still a necessary and important step to solidify the requirements for the new specification

• Compared to the process followed for .11n, less emphasis needed on Use Case Generation, Simulation Scenarios and Comparison Criteria*

* Propose to add system level performance targets and simulation instructions to the Functional Requirements document

November 12, 2008

De Vegt (Qualcomm)Slide 19

doc.: IEEE 802.11-08/1392r0

Submission

Strawmodel VHT TG Selection ProcedureUsage Models

Channel Models

Functional Requirements*

SpecificationFramework

SufficientSupport forFramework?(50%? or 75%?)

Y

N

Contributionsand Decision

Making on Spec Element(s)

Draft SpecComplete andCoherent Enoughfor Letter Ballot?75%?)

Y

N

75% Letter Ballot

* Functional requirement document to include System Level Performance Targets and Simulation Instructions Note: This proposal does not foresee any changes to the subsequent steps in the IEEE procedure (Letter Ballots, Sponsor Ballots)

November 12, 2008

De Vegt (Qualcomm)Slide 20

doc.: IEEE 802.11-08/1392r0

Submission

Topics

1. Context and Introduction2. Overview 802.11n Selection Procedure3. Recap Alterative Proposal Development Process4. Implications for Selection Procedure5. Proposed Next Steps

November 12, 2008

De Vegt (Qualcomm)Slide 21

doc.: IEEE 802.11-08/1392r0

Submission

Proposed Next Steps

• Strawpoll on support for proposed process in principle

• Determine whether both VHT groups want to follow the same (new) Selection procedure

• Create first draft of a VHT Selection Procedure

• Begin construction of an initial Specification Framework?

November 12, 2008

De Vegt (Qualcomm)Slide 22

doc.: IEEE 802.11-08/1392r0

Submission

Strawpoll

• Do you support the concept of creating a Selection Procedure for VHT along the lines outlined in slide 19?