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IEEE P802.11s/D0.02, June 2006

This is an unapproved IEEE Standards Draft, subject to change.

IEEE P802.11s™/D0.02

Draft Amendment to Standard for Information

Technology - Telecommunications and

Information Exchange Between Systems -

LAN/MAN Specific Requirements - Part 11:

Wireless Medium Access Control (MAC) and

physical layer (PHY) specifications: Amendment:

ESS Mesh Networking

Prepared by the 802.11 Working Group of the LAN/MAN Committee

Three Park Avenue

New York, New York 10016-5997, USA

This document is an unapproved draft of a proposed IEEE Standard. As such, this document is subject to

change. USE AT YOUR OWN RISK! Because this is an unapproved draft, this document must not be

utilized for any conformance/compliance purposes. Permission is hereby granted for IEEE Standards

Committee participants to reproduce this document for purposes of IEEE standardization activities only.

Prior to submitting this document to another standards development organization for standardization

activities, permission must first be obtained from the Manager, Standards Licensing and Contracts, IEEE

Standards Activities Department. Other entities seeking permission to reproduce this document, in whole or

in part, must obtain permission from the Manager, Standards Licensing and Contracts, IEEE Standards

Activities Department.

IEEE Standards Activities Department

Standards Licensing and Contracts

445 Hoes Lane, P.O. Box 1331

Piscataway, NJ 08855-1331, USA

IEEE 802.11s/D0.02, June 2006

This is an unapproved IEEE Standards Draft, subject to change.

iii

Introduction

(This introduction is not part of IEEE P802.11s/D0.01, Draft Amendment to Standard for Information

Technology - Telecommunications and Information Exchange Between Systems - LAN/MAN Specific

Requirements - Part 11: Wireless Medium Access Control (MAC) and physical layer (PHY) specifications:

Amendment: ESS Mesh Networking.)

This amendment specifies a framework for WLAN Mesh networking, intended to support a broad range of

deployment scenarios. The focus area for the protocols specified in this document is on unmanaged

WLAN Mesh networks, e.g., small/medium deployments that are not fully configured by a service provider

or IT department. However, the amendment has been specified as a framework which provides common

features of the target applications as a baseline and flexibility to define alternative path selection protocols

and optimizations applicable to specific applications and to enable extensibility for future enhancements.

Patents

Attention is called to the possibility that implementation of this amendment to standard may require use of

subject matter covered by patent rights. By publication of this amendment to standard, no position is taken

with respect to the existence or validity of any patent rights in connection therewith. The IEEE shall not be

responsible for identifying patents or patent applications for which a license may be required to implement

an IEEE standard or for conducting inquiries into the legal validity or scope of those patents that are

brought to its attention.

Participants

At the time this draft amendment to standard was completed, the 802.11 Working Group had the following

membership:

Stuart J. Kerry, Chair

Al Petrick and Harry Worstell, Vice-chair

Editorial Note: centered list of Task Group s officers and editors (from the start, if changes occurred)

followed by a three column list of voting members of 802.11 on the day the draft was sent for sponsor

ballot will be inserted

The following members of the balloting committee voted on this amendment to standard. Balloters may

have voted for approval, disapproval, or abstention.

Editorial Note: three-column list of responding sponsor ballot members will be inserted by IEEE staff

IEEE P802.11s/D0.02, June 2006

This is an unapproved IEEE Standards Draft, subject to change.

CONTENTS

1. Overview.................................................................................................................................................... 3

2. Normative references.................................................................................................................................. 3

3. Definitions.................................................................................................................................................. 3

4. Abbreviations and acronyms ...................................................................................................................... 4

5. General description..................................................................................................................................... 4

5.2 Components of the IEEE 802.11 architecture .......................................................................................... 4

5.3 Logical service interfaces......................................................................................................................... 5

5.4 Overview of the services .......................................................................................................................... 5

5.4.1 Distribution of messages within a DS ................................................................................................... 5

5.4.2 Services that support the distribution service ........................................................................................ 5

5.4.3 Access control and data confidentiality services................................................................................... 5

5.4.4 Spectrum management services............................................................................................................. 5

5.4.5 Traffic differentiation and QoS support ................................................................................................ 5

5.4.6 Support for higher layer timer synchronization..................................................................................... 5

5.4.7 Wireless LAN Mesh.............................................................................................................................. 5

5.4.7.1 Rationale............................................................................................................................................. 5

5.4.7.2 Operational Modes ............................................................................................................................. 6

5.4.7.2.1 Lightweight mesh point operation................................................................................................... 7

5.4.7.2.2 Support for Power Saving Devices in a WLAN Mesh .................................................................... 7

5.4.7.3 Single-Channel and Multi-Channel Operation in a WLAN Mesh...................................................... 8

5.4.7.3.1 RF Channel Interfaces and Unified Channel Graphs....................................................................... 8

5.4.7.3.2 Common Channel Framework......................................................................................................... 9

5.4.7.3.3 Common Channel Selection .......................................................................................................... 10

5.4.7.4 Interconnecting WLAN Mesh with other Networks......................................................................... 11

5.4.7.4.1 General Interworking..................................................................................................................... 11

5.4.7.4.2 Reference Model for WLAN Mesh Interworking ......................................................................... 12

5.4.7.4.3 MAC Data Transport over a WLAN Mesh ...................................................................................12

5.6 Relationship between services............................................................................................................ 13

6. MAC Service Definition........................................................................................................................... 13

7. Frame formats........................................................................................................................................... 13

7.1 MAC frame formats ............................................................................................................................... 13

7.1.1 Conventions......................................................................................................................................... 13

7.1.2 Frame fields......................................................................................................................................... 13

7.1.3 Frame fields......................................................................................................................................... 14

7.1.3.1 Frame Control field .......................................................................................................................... 14

7.1.3.1.1 Protocol Version Field................................................................................................................... 14

7.1.3.1.2 Type and Subtype fields ................................................................................................................ 14

7.1.3.1.3 To DS field.................................................................................................................................... 15

7.1.3.1.4 From DS field................................................................................................................................ 15

7.1.3.1.5 More Fragments field .................................................................................................................... 15

7.1.3.1.6 Retry field...................................................................................................................................... 15

7.1.3.1.7 Power Management field............................................................................................................... 15

7.1.3.1.8 More Data field.............................................................................................................................. 15

7.1.3.2 Duration/ID field .............................................................................................................................. 15

7.1.3.3 Address fields................................................................................................................................... 15

7.1.3.4 Sequence Control fields.................................................................................................................... 15

7.1.3.5 QoS Control field ............................................................................................................................. 15

7.1.3.5a Mesh Forwarding Control field ...................................................................................................... 15

7.1.3.5a.1 Mesh TTL field............................................................................................................................ 16

7.1.3.5a.2 Mesh E2E Sequence number field............................................................................................... 16

7.2 Format of individual frame types ........................................................................................................... 16

7.2.1 Control frames..................................................................................................................................... 16

7.2.1.1 RTS frame format............................................................................................................................. 16

7.2.1.2 CTS frame format............................................................................................................................. 16

IEEE P802.11s/D0.02, June 2006

This is an unapproved IEEE Standards Draft, subject to change.

7.2.1.3 ACK frame format............................................................................................................................ 16

7.2.1.4 PS-Poll frame format........................................................................................................................ 16

7.2.1.5 CF-End frame format........................................................................................................................ 16

7.2.1.6 CF-End+CF-Ack frame format ........................................................................................................ 16

7.2.1.7 Block Ack Request (BlockAckReq) frame format........................................................................... 16

7.2.1.8 Block Ack (BlockAck) frame format ............................................................................................... 16

7.2.1.9 Request to Switch (RTX) frame format............................................................................................ 16

7.2.1.10 Clear to Switch (CTX) frame format.............................................................................................. 17

7.2.2 Data frames.......................................................................................................................................... 17

7.2.3 Management frames ............................................................................................................................ 17

7.2.3.1 Beacon frame format........................................................................................................................ 18

7.2.3.2 IBSS ATIM frame format................................................................................................................. 19

7.2.3.3 Disassociation frame format............................................................................................................. 19

7.2.3.4 Association Request frame format.................................................................................................... 19

7.2.3.5 Association Response frame format................................................................................................. 19

7.2.3.6 Reassociation Request frame format ................................................................................................ 20

7.2.3.7 Reassociation Response frame format.............................................................................................. 20

7.2.3.8 Probe Request frame format............................................................................................................. 21

7.2.3.9 Probe Response frame format........................................................................................................... 21

7.2.4 Extended frames.................................................................................................................................. 22

7.3 Management frame body components.................................................................................................... 22

7.3.1 Fields that are not information elements ............................................................................................. 22

7.3.1.1 Authentication Algorithm Number field........................................................................................... 22

7.3.1.2 Authentication Transaction Sequence Number field........................................................................22

7.3.1.3 Beacon Interval field ........................................................................................................................ 22

7.3.1.4 Capability Information field............................................................................................................. 22

7.3.1.5 Current AP Address field ................................................................................................................. 22

7.3.1.6 Listen Interval field .......................................................................................................................... 22

7.3.1.7 Reason Code field............................................................................................................................. 22

7.3.1.8 AID field........................................................................................................................................... 22

7.3.1.9 Status Code field............................................................................................................................... 22

7.3.1.10 Timestamp field.............................................................................................................................. 22

7.3.1.11 Action field..................................................................................................................................... 23

7.3.2 Information elements........................................................................................................................... 23

7.3.2.1 SSID element.................................................................................................................................... 23

7.3.2.2 Supported Rates element .................................................................................................................. 23

7.3.2.3 FH Parameter Set element................................................................................................................ 23

7.3.2.4 DS Parameter Set element................................................................................................................ 23

7.3.2.5 CF Parameter Set element ................................................................................................................ 23

7.3.2.6 TIM................................................................................................................................................... 23

7.3.2.7 IBSS Parameter Set element............................................................................................................. 23

7.3.2.8 Challenge Text element.................................................................................................................... 23

7.3.2.9 Country information element............................................................................................................ 23

7.3.2.10 Hopping Pattern Parameters information element.......................................................................... 23

7.3.2.11 Hopping Pattern Table information element................................................................................... 23

7.3.2.12 Request information element.......................................................................................................... 23

7.3.2.13 ERP Information element............................................................................................................... 24

7.3.2.14 Extended Supported Rates element ................................................................................................ 24

7.3.2.15 Power Constraint element............................................................................................................... 24

7.3.2.16 Power Capability element............................................................................................................... 24

7.3.2.17 TPC Request element ..................................................................................................................... 24

7.3.2.18 TPC Report element ....................................................................................................................... 24

7.3.2.19 Supported Channels element .......................................................................................................... 24

7.3.2.20 Channel Switch Announcement element........................................................................................ 24

7.3.2.21 Measurement Request element....................................................................................................... 24

7.3.2.22 Measurement Report element......................................................................................................... 24

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