May 2007 doc IEEE 802 11 11 07

May 2007 doc. : IEEE 802. 11 11 -07 -0781 -02 -000 p Using Beacon Frames for WAVE Date: 2007 -05 -16 Authors: Notice: This document has been prepared to assist IEEE 802. 11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802. 11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http: // ieee 802. org/guides/bylaws/sb-bylaws. pdf>, including the statement "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. " Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair stuart@ok -brit. com as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802. 11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at <patcom@ieee. org>. Submission 1 Justin Mc. New – Techno. Com

May 2007 doc. : IEEE 802. 11 11 -07 -0781 -02 -000 p Abstract This presentation includes a proposal for migrating from the “WAVE announcement” action frame to a traditional beacon management frame transmitted on demand by the SME. The corresponding changes, if accepted, will address almost all comments on clause 7 (211 total), 6 comments on clause 9, and many related comments on clause 10. Submission 2 Justin Mc. New – Techno. Com

May 2007 doc. : IEEE 802. 11 11 -07 -0781 -02 -000 p The Need for “On-Demand” Beacons (modified from document 11 -07 -0410 -07 -000 p) • • In the vehicular environment, vehicles and roadside stations will be transmitting simple, non-IP data messages (typically broadcast) in the absence of a BSS The on-demand beacon allows an application or upper layer to request the transmission of one or more beacons to establish a BSS as needed rather than unnecessarily congesting the medium with periodic beacons (e. g. every 100 ms) from vehicles or stations mounted along the roadside (Beacons would actually have to be transmitted every 20 ms or so to achieve the necessary broadcast reliability. The quick beacon allows the SME to request transmission of two or three sequentially if necessary. ) The current ad hoc networking mechanism is not scalable to support rapid movement and rapidly increasing/decreasing numbers of stations within range of each other (this has been well documented) In certain sections of the document dealing with beacons an exception will have to be stated to indicate the behavior for WAVE – • If dot 11 WAVEServices. Enabled is true the on-demand beacon is used, otherwise existing beaconing mechanisms can be used (ad hoc and infrastructure) Overarching advantage compared to other proposals (WAVE Announcement, Quick Beacon, WAVE Management Frame) is that new type of frame is not required Submission 3 Justin Mc. New – Techno. Com

May 2007 doc. : IEEE 802. 11 11 -07 -0781 -02 -000 p Overview of the Recommended Changes • • Add a new service primitive that allows the beacon to be transmitted on demand Required features: – – Transmitted on demand, not periodically Requires addition of optional WSI information element (IE) • Implementations will likely be required to support the presence of multiple instances of the WAVE Services IE (recommend to use WSIE instead of WSI) – • • – – • Concatenation/de-concatenation is not defined in this standard; not necessary to define it or address it in 802. 11 p; the standard currently does not prohibit multiple IE instances WSIE can still be left out and transmitted from higher layer if desired, which allows implementations similar to WAVE Management Frame proposal Additional IEs may defined as part of separate proposals to define additional functionality (e. g. Timing Information from the WAVE Management frame proposal) On demand beacon establishes a WAVE BSS (need to change all instances of WBSS to WAVE BSS) Authentication and association are not used with the on demand beacon Data can be transmitted to and from a DS through the “provider” of the on-demand beacon Extended capabilities indicates on-demand beacon (WAVE Mode) In implementation this will result in only 2 ½ bytes of changes to the frame currently used (WAVE Announcement) to start a WAVE BSS – Submission Changes the frame subtype (½ byte), and eliminates action frame fields category and value (2 bytes) 4 Justin Mc. New – Techno. Com

May 2007 doc. : IEEE 802. 11 11 -07 -0781 -02 -000 p Beacon Contents (REVma – D 9. 0) (items in red currently used in WAVE Announcement) Order Information Element 1 Timestamp 2 Capability 3 SSID 4 Supported Rates … …(additional optional information elements, e. g. regulatory domain info) 23 EDCA Parameter Set 24 Qo. S Capability <ANA> WAVE Services Last Vendor Specific Submission 5 Justin Mc. New – Techno. Com

May 2007 doc. : IEEE 802. 11 11 -07 -0781 -02 -000 p General Changes required • Basic changes required to clauses 5, 9 & 11 – Beacon interval parameter must be addressed (all 1 s? ) – Scanning, synchronization and joining procedures to be further modified in clause 11 • Changes to frame formats in clause 7 required – Changes are straight forward, requires addition of WSIE to beacon frame format • Changes to service primitives in clause 10 required – Remove MLME-WAVEANNOUNCEMENT. xxx – Create MLME-ONDEMANDBEACON. request/confirm and modify MLME-SCAN. request/confirm primitives – Remove MLME-WAJOIN. xxx and modify MLME-JOIN. xxx (if required) – Changes can be straight forward by adding simple exception statement in a few places in the overall document • Minor changes to Annex D (MIB) Submission 6 Justin Mc. New – Techno. Com

May 2007 doc. : IEEE 802. 11 11 -07 -0781 -02 -000 p Motion • Move to accept the proposal to replace the WAVE Announcement with the on demand beacon mechanism as described in document 11 -07 -0781 -02 -000 p and draft the necessary changes the 802. 11 p amendment Move: Justin Mc. New Second: Wayne Fisher Yes: 10 No: 0 Abstain: 1 Submission 7 Justin Mc. New – Techno. Com