May 2004

Harry Worstell, AT&T

Slide 1

doc.: IEEE 802.11-04/538r0

Submission

Harry WorstellAT&T Research

Vice-Chair IEEE 802.11 WGChair – WNM Study Group

IEEE 802.11 Study Group Overview - 2004IEEE 802.11 Study Group Overview - 2004

May 2004

Harry Worstell, AT&T

Slide 2

doc.: IEEE 802.11-04/538r0

Submission

6. Patents

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. This assurance shall be provided without coercion and prior to approval of the standard (or reaffirmation when a patent becomes known after initial approval of the standard). This assurance shall be a letter that is in the form of either

a) A general disclaimer to the effect that the patentee will not enforce any of its present or future patent(s) whose use would be required to implement the proposed IEEE standard against any person or entity using the patent(s) to comply with the standard or

b) A statement that a license will be made available without compensation or under reasonable rates, with reasonable terms and conditions that are demonstrably free of any unfair discrimination

This assurance shall apply, at a minimum, from the date of the standard's approval to the date of the standard's withdrawal and is irrevocable during that period.

IEEE-SA Standards Board Bylaws on Patents in Standards

Approved by IEEE-SA Standards Board – December 2002

May 2004

Harry Worstell, AT&T

Slide 3

doc.: IEEE 802.11-04/538r0

Submission

Inappropriate Topics for IEEE WG/TG/SG Meetings

• Don’t discuss licensing terms or conditions

• Don’t discuss product pricing, territorial restrictions or market share

• Don’t discuss ongoing litigation or threatened litigation

• Don’t be silent if inappropriate topics are discussed… do formally object.

If you have questions,contact the IEEE Patent Committee Administratorat patcom@ieee.org

Approved by IEEE-SA Standards Board – December 2002

May 2004

Harry Worstell, AT&T

Slide 4

doc.: IEEE 802.11-04/538r0

Submission

4 Study Groups 4.1 Function The function of a Study Group (SG) is to complete a defined task with specific output

and in a specific time frame. Once this task is complete, the function of the SG is complete and its charter expires.

  The normal function of a SG is to draft a complete PAR and five criteria (see

subclause 9.2) and to gain approval for them at WG 802.11, 802 EC, IEEE New Standards Committee (NesCom) and the IEEE Standards Board. The decision of whether to utilize the 802.11 WG or to establish a new WG or TAG to carry out work items recommended by a SG is made by the 802 EC with advice from the 802.11 WG.

4.2 Formation A SG is formed when sufficient interest has been identified for a particular area of study within the scope of WG 802.11. The first step in the process is a call for interest. Any WG member or observer can make this at the WG 802.11 opening plenary. An 802.11 SG can then be initiated by 75% approval of the 802.11 WG and must be approved by the 802 EC. During this approval process the 802 EC decides whether a SG is within the scope of WG 802.11, should be moved to another WG or should be set up as an Executive Committee Study Group.

May 2004

Harry Worstell, AT&T

Slide 5

doc.: IEEE 802.11-04/538r0

Submission

4.4 Study Group Operation SG follow the operating procedures for TG specified above with the following exceptions detailed below.

4.4.1 Study Group Meetings SG meetings held adjunct to 802.11 WG Plenary or Interim sessions count towards 802.11 WG voting rights

4.4.2 Voting at Study Group Meetings Any person attending a SG meeting may participate in SG discussions, make motions and vote on all motions (including recommending approval of a PAR and five criteria).

4.4.3 Attendance List Since SGs may have members who are not part of the parent WG, a separate attendance list must be maintained for the meetings of the SG and will be submitted as a document to the WG Vice-Chair.

4.3 Continuation A SG exists for up to 6 months. If it has not completed its work within that time, a request must be made to the WG for an extension for up to additional 6 months. Any request for SG extension will be voted upon at the WG 802.11 closing plenary.

May 2004

Harry Worstell, AT&T

Slide 6

doc.: IEEE 802.11-04/538r0

Submission

• 1940: Spread spectrum technology first used by the military• 1980: Limited applications using narrowband technology • 1989: FCC assigns frequency for commercial use.

ISM bands authorized (900 MHz, 2.4 GHz, 5 GHz) • 1990: 900 MHz products begin shipping

– IEEE begins work on industry standard • 1994: 2.4 GHz products begin shipping • 1997: IEEE 802.11 standard approved.

– 2.4 GHz products begin dominating the scene • 1998: FCC authorizes the UNII Band• 1999: IEEE 802.11a&b standard ratified.

– WECA formed for interoperability testing – Wide Band Frequency Hopping NPRM Released by FCC – “Enhanced MAC - QoS and Security” Task Group chartered

• 2001 QoS/Security enhancements Task Groups begin• 2003 FCC Expands the UNII Band by 255 MHZ

802.11: WLAN History

May 2004

Harry Worstell, AT&T

Slide 7

doc.: IEEE 802.11-04/538r0

Submission

ISO

/OS

I Ref

eren

ce M

odel

Physical

Data Link

Network

Transport

Session

Presentation

Application

Areaof

Focus}Physical Layer

Medium Access Control Sub LayerLLC (802.2) and Bridging (802.1)

802.11: Which Layers are Standardized?

May 2004

Harry Worstell, AT&T

Slide 8

doc.: IEEE 802.11-04/538r0

Submission

Peer/Peer and Client/Server Small User Population Isolated "Cells" and User Groups Non-Contiguous Coverage Indoor Operation Limited Mobility Mostly Asynchronous Traffic Slower than Ethernet

A

A

A

First Generation Wireless LANs

InterNet/IntraNet Ethernet-Compatible Speeds Multiple RF Bands to operate

Second-Generation Wireless LANs

A

CB

A

Larger User Population Full Roaming/Handoff Capability Contiguous Coverage in Dense Areas Wider Area Coverage for Community LANs Mobility (Follow-Me Service) Mix of Async and Isochronous Traffic Higher System Utilization Enhanced Security

IEEE 802.11Fourth-Generation ofWireless Communications

Third-Generation Wireless Communications•TDMA•EDGE•Wideband CDMA

802.11: Indoor Wireless LAN Migration

May 2004

Harry Worstell, AT&T

Slide 9

doc.: IEEE 802.11-04/538r0

Submission

TGk: The First Step in Managing the Radio Resource

Standardized RF Measurements and Methods• Basic measurements available to upper layers from AP and Client

- Neighbor lists for AP’s- Client association to AP lists - Noise histograms- Accurate power level measurements in dBm referenced at the antenna

• Better diagnostics- Obtaining information in a standard form from all equipment

• Enable better frequency planning and network optimization and performance- Automated signal/interference surveys

• Enable new services - Location awareness capabilities for AP’s and Clients

802.11– Configuration for STA and very limited proprietary RF measurements – Widely implemented in APs, but not standardized– Very simple monitoring of global AP statistics (proprietary implementations only)

802.1x– Detailed auth state for individual 1x ports– Also some per port statistics– Not widely implemented in access points today

Bridge MIB– Possible to get some info on which STAs are associated with an AP– Implemented in some APs– Not 802.11 specific, little MAC, and no PHY statistics

Migrating Current MIBs…

To…

NETWORK

LINK/MAC

PHY

May 2004

Harry Worstell, AT&T

Slide 10

doc.: IEEE 802.11-04/538r0

Submission

Porting Management Fundamentals to 802.11

Migrating Present Mechanisms…• Radio Resource Management via CSMA and backoff• Disorganized Reuse• No Coordination (except proprietary methods)• Interference growing• Channels likely to be too noisy for QoS

Disciplined Radio Resource Management• Reuse via space, time, frequency• AP’s syncronized from common backbone• AP’s/Clients communicate across RF channel• Discovery process, followed by self-organizing• Enable Auto-configuration Processes• Enable Cognitive Radio interference avoidance

NETWORK

LINK/MAC

PHYTo…

May 2004

Harry Worstell, AT&T

Slide 11

doc.: IEEE 802.11-04/538r0

Submission

Graph-Coloring Algorithm-6

-5

-6

F1

F1

F2

F2

F3

F4

F5F6Channel/Time AssignmentOptimized for MinimumCo-Channel Interference

B

C

D

E

F

G

A

H

AutomaticReciprocityMeasurements

Benefits:• Reduced Installation Planning

• Improved Coverage

• Modular Capacity Additions

• Self-Healing Capability

Trends: Automatic Frequency/Time Assignment

May 2004

Harry Worstell, AT&T

Slide 12

doc.: IEEE 802.11-04/538r0

Submission

Trends: Increase Reuse Factor with Space, Frequency, Time

3

2

3

13

2

1

21 1

2

3

1

2

2

3

13

2

21

3

1

23

1

23

2

1

13

2

21

3

13

2

2

3

1

3

2

13

2

2

3

1

2 AP Time Interval 1AP Time Interval 2AP Time Interval 3

1 = Freq 12 = Freq 23 = Freq 3

3

QoS 3

Time DomainQOS-Based Protocol

SpatialFrequency /

TimeReuse

QoS 2

QoS 1

Acce

ssLe

gacy