《ISO-8802-11-AMD-4-2006.pdf》由会员分享，可在线阅读，更多相关《ISO-8802-11-AMD-4-2006.pdf（82页珍藏版）》请在三一文库上搜索。
1、 Reference number ISO/IEC 8802-11:2005/Amd.4:2006(E) IEEE Std 802.11g-2003 (Amendment to IEEE Std 802.11-1999) INTERNATIONAL STANDARD ISO/IEC 8802-11 Second edition 2005-08-01 AMENDMENT 4 2006-08-15 IEEE Std 802.11g-2003 (Amendment to IEEE Std 802.11-1999) Information technology Telecommunications a
2、nd information exchange between systems Local and metropolitan area networks Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications AMENDMENT 4: Further Higher Data Rate Extension in the 2.4 GHz Band Technologies de linformation Tlcommunicatio
3、ns et change dinformation entre systmes Rseaux locaux et mtropolitains Exigences spcifiques Partie 11: Spcifications pour le contrle daccs au support et la couche physique AMENDEMENT 4: Extension supplmentaire de dbit suprieur dans la bande de 2,4 GHz Copyright International Organization for Standar
4、dization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/08/2007 09:08:45 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/IEC 8802-11:2005/Amd.4:2006(E) IEEE Std 802.11g-2003 (Amendment to IEEE Std 802.11-19
5、99) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this fi
6、le, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info r
7、elative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. IS
8、O Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/08/2007 09:08:45 MDTNo repr
9、oduction or networking permitted without license from IHS -,-,- IEEE Std 802.11g-2003 (Amendment to IEEE Std 802.11, 1999 Edition (Reaff 2003) as amended by IEEE Stds 802.11a-1999, 802.11b-1999, 802.11b-1999/Cor 1-2001, and 802.11d-2001) IEEE Standards 802.11g TM IEEE Standard for Information techno
10、logy 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 Amendment 4: Further Higher Data Rate Extension in the 2.4 GHz Band Published by The I
11、nstitute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA 27 June 2003 IEEE Computer Society Sponsored by the LAN/MAN Standards Committee IEEE Standards Print: SH95134 PDF: SS95134 This amendment is an approved IEEE Standard. It will be incorporated into the
12、base standard in a future edition. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/08/2007 09:08:45 MDTNo reproduction or networking permitted without license from IHS -,-,- The In
13、stitute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2003 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 25 June 2003. Printed in the United States of America. IEEE and 802 are registered trademarks
14、 in the U.S. Patent +1 978 750 8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. Note: Attention is called to the possibility that implementation of this standard may require use of subject mat
15、ter 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 patents for which a license may be required by an IEEE standard or for conduct
16、ing inquiries into the legal validity or scope of those patents that are brought to its attention. A patent holder has filed a statement of assurance that it will grant licenses under these rights without com- pensation or under reasonable rates and nondiscriminatory, reasonable terms and conditions
17、 to all applicants desiring to obtain such licenses. The IEEE makes no representation as to the reasonableness of rates and/or terms and conditions of the license agreements offered by patent holders. Further information may be obtained from the IEEE Standards Department. Copyright International Org
18、anization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/08/2007 09:08:45 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright 2003 IEEE. All rights reserved.iii Introduction This amend
19、ment 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 designations.1) This family of standards deals with the Physical and Data Link layer
20、s as defined by the International Organization for Standardization (ISO) Open Systems Interconnection (OSI) Basic Reference Model (ISO/ IEC 7498-1: 1994). The access standards define five types of medium access technologies and associated physical media, each appropriate for particular applications
21、or system objectives. Some access standards have been withdrawn and other types are under investigation. The standards defining the technologies noted above are as follows: IEEE Std 802:2Overview and Architecture. This standard provides an overview to the family of IEEE 802 Standards. IEEE Std 802.1
22、BLAN/MAN Management. Defines an OSI management-compatible architecture and 802.1kand services and protocol elements for use in a LAN/MAN environment for ISO/IEC 15802-2performing remote management. IEEE Std 802.1DMedia Access Control (MAC) Bridges. Specifies an architecture and protocol for the inte
23、rconnection of IEEE 802 LANs below the MAC service boundary. 1The IEEE standard designations referred to in the above figure and list are trademarks owned by the Institute of Electrical and Electronics Engineers, Incorporated. 2The IEEE 802 Overview and Architecture Specification, originally known a
24、s IEEE Std 802.1A, has been renumbered as IEEE Std 802. This has been done to accommodate recognition of the base standard in a family of standards. References to IEEE Std 802.1A should be considered as references to IEEE Std 802. This introduction is not part of IEEE Std 802.11g-2003 (Amendment to
25、IEEE Std 802.11, 1999 Edition, as amended by IEEE Stds 802.11a-1999, 802.11b-1999, 802.11b-1999/Cor 1-2001, and 802.11d-2001), IEEE Standard for Information TechnologyTelecommunications and Information Exchange between SystemsLocal and Metropolitan Area NetworksSpecific RequirementsPart 11: Wireless
26、 LAN Me- dium Access Control (MAC) and Physical Layer (PHY) specificationsAmendment 4: Further Higher Data Rate Extension in the 2.4 GHz Band. * Formerly IEEE Std 802.1A. DATA LINK LAYER PHYSICAL 802.2 LOGICAL LINK 802.1 BRIDGING 802.1 MANAGEMENT 802 OVERVIEW therefore, a typical algorithm for setti
27、ng the Use_Protection bit will take into account the traf- fic pattern and history on the network. If a member of an IBSS detects one or more NonERP STAs that are members of the same IBSS, then the Use_Protection bit should be set to 1 in the ERP Information Element of transmitted Beacon and Probe R
28、esponse frames. The NonERP_Present bit shall be set to 1 when a NonERP STA is associated with the BSS. Examples of when the NonERP present bit may additionally be set to 1 include, but are not limited to, when a)A NonERP infrastructure or independent BSS is overlapping (a NonERP BSS may be detected
29、by the reception of a Beacon where the supported rates contain only Clause 15 or Clause 18 rates). b)In an IBSS, if a Beacon frame is received from one of the IBSS participants where the supported rate set contains only Clause 15 or Clause 18 rates. c)A management frame (excluding a Probe Request) i
30、s received where the supported rate set includes only Clause 15 or Clause 18 rates. ERP APs and ERP STAs shall invoke the use of a protection mechanism after transmission or reception of the Use_Protection bit with a value of 1 in an MMPDU to or from the BSS that the ERP AP or ERP STA has joined or
31、started. ERP APs and ERP STAs may additionally invoke protection mechanism use at other times. ERP APs and ERP STAs may disable protection mechanism use after transmission or reception of the Use_Protection bit with a value of 0 in an MMPDU to or from the BSS that the ERP AP or ERP STA has joined or
32、 started. When there are no NonERP STAs associated with the BSS and the ERP Information Element senders dot11ShortPreambleOptionImplemented MIB variable is set to true, then the Barker_Preamble_Mode bit may be set to 0. The Barker_Preamble_Mode bit shall be set to 1 by the ERP Information Element se
33、nder if Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/08/2007 09:08:45 MDTNo reproduction or networking permitted without license from IHS -,-,- IEEE Std 802.11g-2003LOCAL AND ME
34、TROPOLITAN AREA NETWORKS 10Copyright 2003 IEEE. All rights reserved. one or more associated NonERP STAs are not short preamble capable as indicated in their Capability Infor- mation field, or if the ERP Information Element senders dot11ShortPreambleOptionImplemented MIB variable is set to false. If
35、a member of an IBSS detects one or more non-short preamble-capable STAs that are members of the same IBSS, then the Barker_Preamble_Mode bit should be set to 1 in the transmitted ERP Information Element. ERP APs and ERP STAs shall use long preambles when transmitting Clause 15, Clause 18, and Clause
36、 19 frames after transmission or reception of an ERP Information Element with a Barker_Preamble_Mode value of 1 in an MMPDU to or from the BSS that the ERP AP or ERP STA has joined or started, regardless of the value of the short preamble capability bit from the same received or transmitted MMPDU th
37、at contained the ERP Information Element. ERP APs and ERP STAs may additionally use long preambles when transmitting Clause 15, Clause 18, and Clause 19 frames at other times. ERP APs and ERP STAs may use short pream- bles when transmitting Clause 15, Clause 18, and Clause 19 frames after transmissi
38、on or reception of an ERP Information Element with a Barker_Preamble_Mode value of 0 in an MMPDU to or from the BSS that the ERP AP or ERP STA has joined or started, regardless of the value of the short preamble capability bit from the same received or transmitted MMPDU. NonERP STAs and NonERP APs m
39、ay also follow the rules given in this paragraph. Recommended behavior for setting the Use_Protection bit is contained in 9.10. The ERP Information element shall have the form shown in Figure 42E. Bits r3 through r7 are reserved, set to 0, and are ignored on reception. Note that the length of this e
40、lement is flexible and may be expanded in the future. 7.3.2.14 Extended Supported Rates element The Extended Supported Rates element specifies the rates in the OperationalRateSet as described in the MLME_JOIN.request and MLME_START.request primitives that are not carried in the Supported Rates ele-
41、ment. The information field is encoded as 1 to 255 octets where each octet describes a single supported rate. Within Beacon, Probe Response, Association Response, and Reassociation Response management frames, each supported rate belonging to the BSS basic rate set, as defined in 10.3.10.1, is encode
42、d as an octet with the msb (bit 7) set to 1 and bits 6 through 0 are set to the appropriate value from the valid range column of the DATA_RATE row of the table in 10.4.4.2 (e.g., a 1 Mbit/s rate belonging to the BSS basic rate set is encoded as X82). Rates not belonging to the BSS basic rate set are
43、 encoded with the msb set to 0, and bits 6 through 0 are set to the appropriate value from the valid range column of the DATA_RATE row of the table in 10.4.4.2 (e.g., a 2 Mbit/s rate not belonging to the BSS basic rate set is encoded as X04). The msb of each octet in the Extended Supported Rate elem
44、ent in other management frame types is ignored by receiving STAs. BSS basic rate set information in Beacon and Probe Response management frames is used by STAs in order to avoid associating with a BSS if they do not support all the data rates in the BSS basic rate set. Figure 42EERP Information elem
45、ent Octets 1 1 Non ERP present Length (1)Element IDr7r6r5r3Use Protection r4 Barker Preamble mode 1 Octets 1 1 Non ERP present Length (1)Element IDr7r6r5r3Use Protection r4 Barker Preamble mode 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee
46、=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 05/08/2007 09:08:45 MDTNo reproduction or networking permitted without license from IHS -,-,- IEEE AMENDMENT 4: FURTHER HIGHER DATA RATE EXTENSION IN THE 2.4 GHz BANDStd 802.11g-2003 Copyright 2003 IEEE. All rights reserved.11 For stations
47、 supporting eight or fewer data rates, this element is optional for inclusion in all of the frame types that include the supported rates element. For stations supporting more than eight data rates, this ele- ment shall be included in all of the frame types that include the supported rates element. T
48、he Extended Supported Rates element has the format shown in Figure 42F. 9. MAC sublayer functional description 9.2 DCF Change the eleventh paragraph in 9.2 as shown: The medium access protocol allows for stations to support different sets of data rates. All STAs shall be able to receive and transmit at all the data rates in the aBasicRateSet specified parameter of the MLME_Join.request and MLME_Start.request primitives. To support the proper operation of the RTS/CTS and the virtual CS mechanism, all STAs shall be able to detect the RTS and CTS frames. For this re