21-07-0042-00-0000

IEEE 802.21 MEDIA INDEPENDENT HANDOVER

DCN: 21-07-00xx-00-0000

Title: Liaison Report – 802.11 Work Related to 802.21

Date Submitted: December 18, 2007

Presented at IEEE 802.21 session 18 in London, U.K.

Authors or Source(s):  David Hunter

Abstract: 802.11 is one of the technologies that 802.21 MIH is required to support.

21-07-0042-00-0000

IEEE 802.21 presentation release statementsThis document has been prepared to assist the IEEE 802.21 Working Group. 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.

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 802.21.

The contributor is familiar with IEEE patent policy, as outlined in Section 6.3 of the IEEE-SA Standards Board Operations Manual <http://standards.ieee.org/guides/opman/sect6.html#6.3> and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/guide.html> 

21-07-0042-00-0000

Liaison ReportIEEE 802.11 work most related to 802.21

David Hunter

Panasonichunter@timefactor.com

21-07-0042-00-0000

• 802.11k – Radio Resource Measurement• Measurements provided for runtime adjustment of radios• Available to internal STA components, higher layers, and external devices

• 802.11m – Maintenance (compilation of all approved amendments)• Work is now complete: will become IEEE Std. 802.11-2007 in March 2007• New 802.11mb work will start in March 2007

• 802.11r – Fast BSS Transition• Between BSSes within the same ESS• Relies on 802.11k (especially neighbor reports)

• 802.11u – Interworking with External Networks• MAC changes to accommodate, among others, 802.21• Relies on 802.11k and 802.11r; has scope agreement with 802.11v• Joint meeting with 802.21 this week; more in March

• 802.11v – Wireless Network Management• Management protocol additions• AP-AP negotiations; load balancing; additional access controls• Relies on 802.11k

• 802.11w – Protecting Management Frames• Security for management frames, including broadcast frames• Relies on 802.11k, 802.11r and perhaps 802.11u

802.11 Groups Related to 802.21 (the usual suspects)

21-07-0042-00-0000

802.11 Work Group Ballots

• Three letter ballots (TGp, TGs, TGy) • TGp: 67% approval (after 1 vote invalidated)• TGs: 48% approval (after 6 votes invalidated)• TGy: 75.7% approval (after 2 votes invalidated)

• First lesson: each ballot had invalid votes• Most because of lack of comments with a “No” vote• But one was a set of comments, but no vote • Note: an invalid vote does NOT help you maintain your voting status

• Second lesson: what 75% really is• For a period, TGy had 74.9% approval• Chair’s initial interpretation of that as 75% was challenged• 802.11 Chair checked with IEEE representatives

• But received two different interpretations• So decided to rule that “75%” means 75.000% or better, period

• Lesson not yet learned:• Could have 4 letter ballots issued from this session

21-07-0042-00-0000

802.11s Ballot Overview

• Issued its Letter Ballot 1 in November • 48% approval• Received 5681 comments

• New record for ratio of comments per active participant• TGn had 12,000 comments, but over 5 times as many active

contributors• Biggest bulk of comments are on frame formats

• Either: logic is well agreed• Or: commenters haven’t evaluated the protocol that

thoroughly yet• Or: current draft is incomplete on its messaging

21-07-0042-00-0000

802.11u Highlights(fortunately, many of you now know 11u better than I do)

• November: issued Draft D0.02 for Internal Review• Received 275 internal comments

• 11-06-1857-06-000u-internal-comment-review-summary.xls• In November 802.21 members were invited to participate• Any comments from 802.21 members who are not already 802.11u members?

• Currently doing comment resolution• Many, many comments on filling in known blank spots in current draft

• Since current draft is incomplete• Lined up some volunteers for these areas; still looking for more

• Ad-hoc meeting • February 19-23, 2007• One day meeting with 802.21 in that timeframe? • Volunteers for new text aiming at presenting at ad-hoc meeting• Goal is to have that generally agreed on before March Plenary

• Sent liaison letter to 802.21• 802.11u – 802.21 meetings cover this• 802.21 reply now: 21-07-0030-00-0000-Liaison-Response-to-802-11-from-802-21

21-07-0042-00-0000

802.11r This Session

• Re-circulation ballot• Issued re-circulation ballot in September (Draft 3.0)• Another re-circulation ballot in November (Draft 4.0)• Finished almost all comments this week • But decided not to issue re-circulation ballot this week

• Will be doing final comment resolution in February ad-hoc

• Drafts• Draft 4.1 came out last night• Current comment responses are in

11-06-1895-16-000r-d4-comments.xls• Re-circulation ballot (from March session) will be on Draft

5.0

21-07-0042-00-0000

802.11r This Session, 2• Controversy #1

• Ruling by the TGr chair• In November a motion to make a group of changes related to key distribution

was first defeated, then successful.• For the ruling controversy, compare 11-06-1765-00 and 11-06-1765-01, then see

documents:– 11-06-1906-00-000r-response-to-ieee-802-11-appeal-december-5 th-2006.doc– 11-07-0181-00-000r-chair-ruling-2007-01-18.doc

• If the appeal wins, then there will be major changes in the draft– And there will not be a recirculation ballot after this week

• Controversy #2• Technical issue behind controversy #1

• About the distribution of keys from R0 Key Holder to R1 Key Holder• In September a “pull” model of distribution was inserted by bare 75% vote• In November replaced the “pull” model by a “push” model, by another bare

75% vote– Significant portions of Draft 3 reverted to Draft 2.2; created draft 3.1

• Clearest technical summary of November arguments:– 11-06-1765-01-000r-pmk-r1-key-distribution-security-analysis.ppt– 11-06-1613-02-000r-key-distribution-push-capability.doc

21-07-0042-00-0000

802.11r This Session, 3

• Controversy #3• Architecture of non-AP STA

• Does it need to have the same logical blocks as the AP?• Some argue that symmetry between AP and non-AP required for

security.• Still an issue today

• Must solve this issue to go to letter ballot• May or may not be solved this afternoon

• Today the pure documentation issue was split off:• Document differences between external security interfaces of AP and

non-AP STA• This issue is being resolved this afternoon

21-07-0042-00-0000

802.11r Timeline• PAR was approved over 2 years ago

• Another Ad-Hoc Comment Resolution Meeting Scheduled• February 21-23, 2007 in Santa Clara, California

• Circulations• Possible to go to Sponsor Ballot after July, 2007 Plenary

• Limitations • IETF support : Key Management

• 11r is putting very specific requirements on key management• Goal is still to have a new RFC issued within a year

• Dependency on 802.11-2007, which will become full Std in March, 2007• 802.11k dependencies

• If 802.11k doesn’t finish first, arrangement is to copy the portions of 802.11k that 802.11r needs

• Key point: 802.11r sponsor ballot still before 802.21 sponsor ballot

• But the race is getting even closer