802.11 -1999.pdf

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Title Page

ANSI/IEEE Std 802.11, 1999 Edition

Introduction to ANSI/IEEE Std 802.11, 1999 Edition

Participants

CONTENTS

1. Overview

1.1 Scope

1.2 Purpose

2. Normative references

3. Definitions

4. Abbreviations and acronyms

5. General description

5.1 General description of the architecture

5.2 Components of the IEEE 802.11 architecture

5.3 Logical service interfaces

5.4 Overview of the services

5.5 Relationships between services

5.6 Differences between ESS and IBSS LANs

5.7 Message information contents that support the services

5.8 Reference model

6. MAC service definition

6.1 Overview of MAC services

6.2 Detailed service specification

7. Frame formats

7.1 MAC frame formats

7.2 Format of individual frame types

7.3 Management frame body components

8. Authentication and privacy

8.1 Authentication services

8.2 The Wired Equivalent Privacy (WEP) algorithm

8.3 Security-Related MIB attributes

9. MAC sublayer functional description

9.1 MAC architecture

9.2 DCF

9.3 PCF

9.4 Fragmentation

9.5 Defragmentation

9.6 Multirate support

9.7 Frame exchange sequences

9.8 MSDU transmission restrictions

10. Layer management

10.1 Overview of management model

10.2 Generic management primitives

10.3 MLME SAP interface

10.4 PLME SAP interface

11. MAC sublayer management entity

11.1 Synchronization

11.2 Power management

11.3 Association and reassociation

11.4 Management information base (MIB) definitions

12. Physical layer (PHY) service specification

12.1 Scope

12.2 PHY functions

12.3 Detailed PHY service specifications

13. PHY management

14. Frequency-Hopping spread spectrum (FHSS) PHY specification for the 2.4 GHz Industrial, Scient...

14.1 Overview

14.2 FHSS PHY-specific service parameter lists

14.3 FHSS PLCP sublayer

14.4 PLME SAP layer management

14.5 FHSS PMD sublayer services

14.6 FHSS PMD sublayer, 1.0 Mbit/s

14.7 FHSS PMD sublayer, 2.0 Mbit/s

14.8 FHSS PHY management information base (MIB)

14.9 FH PHY characteristics

15. Direct sequence spread spectrum (DSSS) PHY specification for the 2.4GHz band designated for ...

15.1 Overview

15.2 DSSS PLCP sublayer

15.3 DSSS physical layer management entity (PLME)

15.4 DSSS PMD sublayer

16. Infrared (IR) PHY specification

16.1 Overview

16.2 IR PLCP sublayer

16.3 IR PMD sublayer

16.4 PHY attributes

Annex A—Protocol Implementation Conformance Statement (PICS) proforma

A.1 Introduction

A.2 Abbreviations and special symbols

A.2.1 Status symbols

A.2.2 General abbreviations

A.3 Instructions for completing the PICS proforma

A.3.1 General structure of the PICS proforma

A.3.2 Additional information

A.3.3 Exception information

A.3.4 Conditional status

A.4 PICS proforma—ISO/IEC 8802-11: 1999

A.4.1 Implementation identification

A.4.2 Protocol summary, ISO/IEC 8802-11: 1999

A.4.3 IUT configuration

A.4.4 MAC protocol

A.4.5 Frequency-Hopping PHY functions (continued)

A.4.6 Direct sequence PHY functions (continued)

A.4.7 Infrared baseband PHY functions (continued)

Annex B—Hopping sequences

Annex C—Formal description of MAC operation

C.1 Introduction to the MAC formal description

C.1.1 Fundamental assumptions

C.1.2 Notation conventions

C.1.3 Modeling techniques

C.2 Data type and operator definitions for the MAC state machines

C.3 State machines for MAC stations

C.4 State machines for MAC access point

Annex D—ASN.1 encoding of the MAC and PHY MIB

Annex E—Bibliography

E.1 General

E.2 Specification and description language (SDL) documentation

International Standard ISO/IEC 8802-11: 1999(E) ANSI/IEEE Std 802.11, 1999 Edition (R2003) Information technology— Telecommunications and information exchange between systems— Local and metropolitan area networks— Speciﬁc requirements— Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Speciﬁcations Sponsor LAN MAN Standards Committee of the IEEE Computer Society

ANSI/IEEE Std 802.11, 1999 Edition IEEE Standards documents are developed within the Technical Committees of the IEEE Societies and the Standards Coordinating Committees of the IEEE Standards Board. Members of the committees serve volun- tarily and without compensation. They are not necessarily members of the Institute. The standards developed within IEEE represent a consensus of the broad expertise on the subject within the Institute as well as those activities outside of IEEE that have expressed an interest in participating in the development of the standard. Use of an IEEE Standard is wholly voluntary. The existence of an IEEE Standard does not imply that there are no other ways to produce, test, measure, purchase, market, or provide other goods and services related to the scope of the IEEE Standard. Furthermore, the viewpoint expressed at the time a standard is approved and issued is subject to change brought about through developments in the state of the art and comments received from users of the standard. Every IEEE Standard is subjected to review at least every ﬁve years for revision or reafﬁrmation. When a document is more than ﬁve years old and has not been reafﬁrmed, it is rea- sonable to conclude that its contents, although still of some value, do not wholly reﬂect the present state of the art. Users are cautioned to check to determine that they have the latest edition of any IEEE Standard. Comments for revision of IEEE Standards are welcome from any interested party, regardless of membership afﬁliation with IEEE. Suggestions for changes in documents should be in the form of a proposed change of text, together with appropriate supporting comments. Interpretations: Occasionally questions may arise regarding the meaning of portions of standards as they relate to speciﬁc applications. When the need for interpretations is brought to the attention of IEEE, the Institute will initiate action to prepare appropriate responses. Since IEEE Standards represent a consensus of all concerned interests, it is important to ensure that any interpretation has also received the concurrence of a balance of interests. For this reason IEEE and the members of its technical committees are not able to pro- vide an instant response to interpretation requests except in those cases where the matter has previously received formal consideration. Comments on standards and requests for interpretations should be addressed to: Secretary, IEEE Standards Board 445 Hoes Lane P.O. Box 1331 Piscataway, NJ 08855-1331 USA Note: Attention is called to the possibility that implementation of this standard may require use of sub- ject matter covered by patent rights. By publication of this 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 all patents for which a license may be required by an IEEE standard or for conducting inquiries into the legal validity or scope of those patents that are brought to its attention. The patent holder has, however, filed a statement of assurance that it will grant a license under these rights without compensation or under reasonable rates and nondiscriminatory, reasonable terms and conditions to all applicants desiring to obtain such a license. The IEEE makes no representation as to the reasonableness of rates and/or terms and conditions of the license agreement offered by the patent holder. Contact information may be obtained from the IEEE Standards Department. Authorization to photocopy portions of any individual standard for internal or personal use is granted by the Institute of Electrical and Electronics Engineers, Inc., provided that the appropriate fee is paid to Copyright Clearance Center. To arrange for payment of licensing fee, please contact Copyright Clearance Center, Cus- tomer Service, 222 Rosewood Drive, Danvers, MA 01923 USA; (978) 750-8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copy- right Clearance Center. iv Copyright © 1999 IEEE. All rights reserved.

Introduction to ANSI/IEEE Std 802.11, 1999 Edition (This introduction is not a part of ANSI/IEEE Std 802.11, 1999 Edition or of ISO/IEC 8802-11: 1999, but is included for information purpose only.) This standard is part of a family of standards for local and metropolitan area networks. The relationship between the standard and other members of the family is shown below. (The numbers in the ﬁgure refer to IEEE standard numbers.) I Y T R U C E S 0 1 2 0 8 . I * E R U T C E T H C R A & W E V R E V O 2 0 8 I T N E M E G A N A M 1 . 2 0 8 802.2 LOGICAL LINK CONTROL 802.1 BRIDGING DATA LINK LAYER 802.3 MEDIUM ACCESS 802.4 MEDIUM ACCESS 802.5 MEDIUM ACCESS 802.6 MEDIUM ACCESS 802.9 MEDIUM ACCESS 802.11 MEDIUM ACCESS 802.12 MEDIUM ACCESS 802.3 PHYSICAL 802.4 PHYSICAL 802.5 PHYSICAL 802.6 PHYSICAL 802.9 PHYSICAL 802.11 PHYSICAL 802.12 PHYSICAL PHYSICAL LAYER * Formerly IEEE Std 802.1A. This family of standards deals with the Physical and Data Link layers as deﬁned by the International Organiza- tion for Standardization (ISO) Open Systems Interconnection (OSI) Basic Reference Model (ISO/IEC 7498- 1: 1994). The access standards deﬁne seven types of medium access technologies and associated physical media, each appropriate for particular applications or system objectives. Other types are under investigation. The standards deﬁning the access technologies are as follows: • IEEE Std 802 Overview and Architecture. of IEEE 802 Standards. This standard provides an overview to the family • ANSI/IEEE Std 802.1B and 802.1k [ISO/IEC 15802-2] LAN/MAN Management. ture, and services and protocol elements for use in a LAN/MAN environment for performing remote management. Deﬁnes an OSI management-compatible architec- • ANSI/IEEE Std 802.1D [ISO/IEC 15802-3] Speciﬁes an architecture and protocol Media Access Control (MAC) Bridges. for the interconnection of IEEE 802 LANs below the MAC service boundary. • ANSI/IEEE Std 802.1E [ISO/IEC 15802-4] System Load Protocol. aspects of management concerned with the loading of systems on IEEE 802 LANs. Speciﬁes a set of services and protocol for those • IEEE Std 802.1F Common Deﬁnitions and Procedures for IEEE 802 Management Information • ANSI/IEEE Std 802.1G [ISO/IEC 15802-5] . Speciﬁes extensions for the Remote Media Access Control (MAC) Bridging interconnection, using non-LAN communication technologies, of geographi- cally separated IEEE 802 LANs below the level of the logical link control protocol. • ANSI/IEEE Std 802.2 Logical Link Control [ISO/IEC 8802-2] Copyright © 1999 IEEE. All rights reserved. v

• ANSI/IEEE Std 802.3 CSMA/CD Access Method and Physical Layer Speciﬁcations [ISO/IEC 8802-3] • ANSI/IEEE Std 802.4 Token Passing Bus Access Method and Physical Layer Speciﬁcations [ISO/IEC 8802-4] • ANSI/IEEE Std 802.5 Token Ring Access Method and Physical Layer Speciﬁcations [ISO/IEC 8802-5] • ANSI/IEEE Std 802.6 [ISO/IEC 8802-6] Distributed Queue Dual Bus Access Method and Physical Layer Speciﬁca- tions • ANSI/IEEE Std 802.9 [ISO/IEC 8802-9] Integrated Services (IS) LAN Interface at the Medium Access Control (MAC) and Physical (PHY) Layers • ANSI/IEEE Std 802.10 Interoperable LAN/MAN Security • IEEE Std 802.11 [ISO/IEC DIS 8802-11] Wireless LAN Medium Access Control (MAC) and Physical Layer Speciﬁ- cations • ANSI/IEEE Std 802.12 [ISO/IEC DIS 8802-12] Demand Priority Access Method, Physical Layer and Repeater Speciﬁca- tions In addition to the family of standards, the following is a recommended practice for a common Physical Layer technology: • IEEE Std 802.7 IEEE Recommended Practice for Broadband Local Area Networks The following additional working group has authorized standards projects under development: • IEEE 802.14 Standard Protocol for Cable-TV Based Broadband Communication Network Conformance test methodology An additional standards series, identiﬁed by the number 1802, has been established to identify the conformance test methodology documents for the 802 family of standards. Thus the conformance test documents for 802.3 are numbered 1802.3. ANSI/IEEE Std 802.11, 1999 Edition [ISO/IEC 8802-11: 1999] This standard is a revision of IEEE Std 802.11-1997. The Management Information Base according to OSI rules has been removed, many redundant management items have been removed, and Annex D has been completed with the Management Information Base according to SNMP. Minor changes have been made throughout the document. This standard deﬁnes the protocol and compatible interconnection of data communication equipment via the “air”, radio or infrared, in a local area network (LAN) using the carrier sense multiple access protocol with collision avoidance (CSMA/CA) medium sharing mechanism. The medium access control (MAC) supports operation under control of an access point as well as between independent stations. The protocol includes authentication, association, and reassociation services, an optional encryption/decryption procedure, power management to reduce power consumption in mobile stations, and a point coordination function for time- bounded transfer of data. The standard includes the deﬁnition of the management information base (MIB) using Abstract Syntax Notation 1 (ASN.1) and speciﬁes the MAC protocol in a formal way, using the Speci- vi Copyright © 1999 IEEE. All rights reserved.

ﬁcation and Description Language (SDL). Both ASN.1 and SDL source code have been added on a ﬂoppy diskette. The infrared implementation of the PHY supports 1 Mbit/s data rate with an optional 2 Mbit/s extension. The radio implementations of the PHY specify either a frequency-hopping spread spectrum (FHSS) supporting 1 Mbit/s and an optional 2 Mbit/s data rate or a direct sequence spread spectrum (DSSS) supporting both 1 and 2 Mbit/s data rates. This standard contains state-of-the-art material. The area covered by this standard is undergoing evolution. Revisions are anticipated to this standard within the next few years to clarify existing material, to correct possible errors, and to incorporate new related material. Information on the current revision state of this and other IEEE 802 standards may be obtained from Secretary, IEEE Standards Board 445 Hoes Lane P.O. Box 1331 Piscataway, NJ 08855-1331 USA Participants At the time the draft of the 1999 version of this standard was sent to sponsor ballot, the IEEE 802.11 working group had the following voting members: Victor Hayes, Chair Bob O’Hara, Stuart J. Kerry and Al Petrick, Vice Chairs 802.11rev Task Group Chair and Technical Editor George Fishel, Secretary David Bagby, Mac Group Chair Jan Boer, Dean Kawaguchi, PHY Group and FH Chair Direct Sequence Chair Michael Fischer and Allen Heberling, State Diagram Editors Naftali Chayat, Task Group a Chair John Fakatselis, Task Group b Chair Victoria M. Poncini, Task Group c Chair Jeff Abramowitz Keith B. Amundsen Carl F. Andren Kazuhiro Aoyagi Phil Belanger John Biddick Simon Black Ronald Brockmann Wesley Brodsky John H. Cafarella Ken Clements Wim Diepstraten Darrol Draper Peter Ecclesine Darwin Engwer Jeff Fischer Matthew Fischer Michael Fischer John Fisher Motohiro Gochi Tim Godfrey Jan Haagh Karl Hannestad Robert Heile Maarten Hoeben Duane Hurne Masayuki Ikeda Richard Jai Donald C. Johnson Nobuo Karaki Isao Masaki Jim McDonald Gene Miller Akira Miura Masaharu Mori Masahiro Morikura Ravi P. Nalamati Colin Nayler Richard van Nee Tomoki Ohsawa Kazuhiro Okanoue Richard H. Paine Bob Pham Stanley A. Reible William Roberts Kent G. Rollins Oren Rosenfeld Michael Rothenberg Clemens C. W. Ruppel Chandos Rypinski Anil K. Sanwalka Roy Sebring Mike Shiba Thomas Siep Donald I. Sloan Hitoshi Takanashi Satoru Toguchi Cherry Tom Mike Trompower Tom Tsoulogiannis Sarosh N. Vesuna Nien C. Wei Harry Worstell Timothy M. Zimmerman Jonathan M. Zweig Jim Zyren Copyright © 1999 IEEE. All rights reserved. vii

Major contributions to the 1999 edition were received from the following individuals: Henri Moelard Richard Ozer Arnoud Zwemmer The following members of the balloting committee voted on the 1999 version of this standard: Kit Athul Thomas W. Bailey Peter K. Campbell James T. Carlo David E. Carlson Brian J. Casey Naftali Chayat Robert S. Crowder Wim Diepstraten Thomas J. Dineen Christos Douligeris Paul S. Eastman Philip H. Enslow Changxin Fan John W. Fendrich Michael A. Fischer George R. Fishel Harvey A. Freeman Robert J. Gagliano Patrick S. Gonia Julio Gonzalez-Sanz Chris G. Guy Victor Hayes Donald N. Heirman Henry Hoyt Raj Jain A. Kamerman Dean M. Kawaguchi Edward R. Kelly Gary C. Kessler Yongbum Kim Stephen Barton Kruger Joseph Kubler Lanse M. Leach Jai Yong Lee Randolph S. Little Ronald Mahany Peter Martini Richard McBride Bennett Meyer Gene E. Milligan David S. Millman Hiroshi Miyano Warren Monroe John E. Montague Wayne D. Moyers Shimon Muller Ken Naganuma Paul Nikolich Robert O’Hara Donal O’Mahony Roger Pandanda Ronald C. Petersen John R. Pickens Alberto Profumo Vikram Punj James A. Renfro Gary S. Robinson Edouard Y. Rocher James W. Romlein Floyd E. Ross Michael Rothenberg Christoph Ruland Anil K. Sanwalka James E. Schuessler Rich Seifert Leo Sintonen Patricia Thaler Mike Trompower Mark-Rene Uchida Emmanuel Van Lil Sarosh N. Vesuna James Vorhies Barry M. Vornbrock Qian-li Yang Oren Yuen Chris Zegelin Jonathan M. Zweig At the time the draft of the 1997 version of this standard was sent to sponsor ballot, the IEEE 802.11 work- ing group had the following voting members: Victor Hayes, Chair Stuart J. Kerry and Chris Zegelin, Vice Chairs Bob O’Hara and George Fishel Greg Ennis, and Chief Technical Editors Carolyn L. Heide, Secretaries David Bagby, Jan Boer, MAC Group Chair Direct Sequence Chair C. Thomas Baumgartner, Infrared Chair and Editor Michael Fischer, State Diagram Editor Dean M. Kawaguchi, PHY Group and FH Chair Mike Trompower, Direct Sequence Editor Jeff Abramowitz Keith B. Amundsen Phil Belanger Manuel J. Betancor* John Biddick Simon Black Alessandro M. Bolea Pablo Brenner Peter E. Chadwick Naftali Chayat Jonathon Y. Cheah Hae Wook Choi Wim Diepstraten Robert J. Egan Darwin Engwer John Fakatselis Matthew Fischer Keith S. Furuya Rich Gardner Ian Gifford Howard J. Hall Bill Huhn Donald C. Johnson Mikio Kiyono Joseph J. Kubler Arthur Lashbrook F. J. Lopez-Hernandez Ronald Mahany Bob Marshall Jim McDonald Akira Miura Wayne D. Moyers Ravi P. Nalamati Mitsuji Okada Al Petrick Miri Ratner James A. Renfro William Roberts Jon Walter Rosdahl viii Copyright © 1999 IEEE. All rights reserved.

Michael Rothenberg Chandos A. Rypinski Anil K. Sanwalka Roy Sebring Glen Sherwood Thomas Siep Nathan Silberman Don Sloan Greg Smith Marvin L. Sojka Dave Strohschein Bert Sullam Mack Sullivan Tom Tsoulogiannis Jeanine Valadez Sarosh Vesuna Richard E. White Donna A. Woznicki Timothy M. Zimmerman Johnny Zweig Major contributions to the 1997 version were received from the following individuals: Robert Achatz Ken Biba Paul Eastman Ed Geiger Larry van der Jagt *Deceased Richard Lee Kerry Lynn Michael Masleid John McKown K. S. Natarajan Jim Neally Richard Ozer Thomas Phinney Leon S. Scaldeferri* Jim Schuessler François Y. Simon The following persons were on the balloting committee for the 1997 version of this standard: Bernhard Albert Jon M. Allingham Jack S. Andresen Kit Athul Anthony L. Barnes Robert T. Bell Manuel J. Betancor Simon Black Alan L. Bridges Graham Campbell James T. Carlo David E. Carlson Peter E. Chadwick Naftali Chayat Alan J. Chwick Ken Clements Robert S. Crowder Rifaat Dayem Wim Diepstraten Edward A. Dunlop Sourav K. Dutta Paul S. Eastman Peter Ecclesine Gregory Elkmann John E. Emrich Philip H. Enslow Changxin Fan Michael A. Fischer Harvey A. Freeman Robert J. Gagliano Patrick S. Gonia N. Douglas Grant Govert M. Grifﬁoen Joseph L. Hammond Victor Hayes Kenneth C. Heck Jan Hoogendoorn Russell D. Housley Walter K. Hurwitz Richard J. Iliff Tomoaki Ishifuji Carlos Islas-Perez Raj Jain A. Kamerman Peter M. Kelly Yongbum Kim Mikio Kiyono Thaddeus Kobylarz Stephen B. Kruger Joseph J. Kubler David J. Law Jai Yong Lee Jungtae Lee Daniel E. Lewis Randolph S. Little Ming T. Liu Joseph C. J. Loo Donald C. Loughry Robert D. Love Ronald Mahany Jim L. Mangin Peter Martini P. Takis Mathiopoulos Steve Messenger Bennett Meyer Ann Miller David S. Millman Hiroshi Miyano Stig Frode Mjolsnes W. Melody Moh John E. Montague Wayne D. Moyers Paul Nikolich Ellis S. Nolley Robert O’Hara Donal O’Mahony Roger Pandanda Lalit Mohan Patnaik Lucy W. Person Thomas L. Phinney Vikram Prabhu Alberto Profumo David L. Propp Vikram Punj Andris Putnins Fernando Ramos James W. Romlein Floyd E. Ross Michael Rothenberg Christoph Ruland Chandos A. Rypinski Anil K. Sanwalka Gregory D. Schumacher Rich Seifert Lee A. Sendelbach Michael Serrone Adarshpal S. Sethi Donald A. Sheppard Nathan Silberman Joseph S. Skorupa Michael A. Smith Marvin L. Sojka Efstathios D. Sykas Geoffrey O. Thompson Robert C. Tripi Mike Trompower David B. Turner Mark-Rene Uchida James Vorhies Yun-Che Wang Raymond P. Wenig Earl J. Whitaker David W. Wilson Jerry A. Wyatt Qian-Li Yang Iwen Yao Oren Yuen Jonathan M. Zweig Copyright © 1999 IEEE. All rights reserved. ix

When the IEEE-SA Standards Board approved this standard on 18 March 1999, it had the following membership: Richard J. Holleman, Chair Donald N. Heirman, Vice Chair Judith Gorman, Secretary Satish K. Aggarwal Dennis Bodson Mark D. Bowman James T. Carlo Gary R. Engmann Harold E. Epstein Jay Forster* Ruben D. Garzon *Member Emeritus James H. Gurney Lowell G. Johnson Robert J. Kennelly E. G. “Al” Kiener Joseph L. Koepﬁnger* L. Bruce McClung Daleep C. Mohla Robert F. Munzner Louis-François Pau Ronald C. Petersen Gerald H. Peterson John B. Posey Gary S. Robinson Akio Tojo Hans E. Weinrich Donald W. Zipse Also included is the following nonvoting IEEE-SA Standards Board liaison: Robert E. Hebner Valerie E. Zelenty IEEE Standards Project Editor x Copyright © 1999 IEEE. All rights reserved.

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