doc.: IEEE 802.11-10/0873r0

Submission

July 2010

Hiroki Nakano, Trans New Technology, Inc.Slide 1

Effectiveness of Reduction of Message ExchangesDate: 2010-07-14

Authors:Name Company Address Phone emailHiroki NAKANO Trans New

Technology, Inc.

Sumitomo-Seimei Kyoto Bldg. 8F, 62 Tukiboko-cho Shimogyo-ku, Kyoto 600-8492 JAPAN

+81-75-213-1200 cas.nakano@gmail.comcas@trans-nt.com

Hitoshi MORIOKA ROOT Inc. #33 Ito Bldg. 2-14-38 Tenjin, Chuo-ku, Fukuoka 810-0001 JAPAN

+81-92-771-7630 hmorioka@root-hq.com

Hiroshi MANO ROOT Inc. 8F TOC2 Bldg. 7-21-11 Nishi-Gotanda, Shinagawa-ku, Tokyo 141-0031 JAPAN

+81-3-5719-7630 hmano@root-hq.com

Marc Emmelmann FOKUS Kaiserin-Augusta-Allee 3110589 BerlinGERMANY

+49-30-3463 7268 emmelmann@ieee.org

doc.: IEEE 802.11-10/0873r0

Submission

Significant comments to FIA

• Proposed idea and scope– Reducing the number of massage exchange of association and

authentication.

• Comment – Is this enough effective to reduce the total link set up time?– Should we consider the reduction of the number of exchanges of

the higher layer?

July 2010

Hiroki Nakano, Trans New Technology, Inc.Slide 2

doc.: IEEE 802.11-10/0873r0

Submission

July 2010

Hiroki Nakano, Trans New Technology, Inc.Slide 3

STA AP

EAPOL-Start

EAP-Success

PEAPEAP-MSCHAPv2(4 round trip)

Establishing TLS tunnel for PEAP(3 round trip)

EAP-Identity (1 round trip)

Association (1 round trip)

Authentication (1 round trip)

EAPOL-Key(2 round trip)

Probe (1 round trip)

EAPOL-Start (0.5round trip)

EAPOL-Success (0.5round trip)

DHCP(2 round trip)

1/16 = 6.25%

2/16 = 12.5%

11/16 = 68.75%

2/16=12.5%

Most of message exchanges are consumed for Authentication and Association.

doc.: IEEE 802.11-10/0873r0

Submission

How many roundtrips do messages go?

PEAPv0 / EAP-MSCHAPv2 EAP-FAST Target of FIA

802.11 Probe Req./Resp. 1 1 1

802.11 Auth. Req./Resp. 1 1

1

802.11 Assoc. Req./Resp. 1 1

EAPOL-Start 0.5 0.5

TLS tunnel establishment 4 3

EAP-Identity Req./Resp. 1 1

EAP-MSCHAPv2 2 2

EAP-Extension Req./Resp. 1 1

EAP-Success 0.5 0.5

EAPOL-Key handshake 2 2

IPv4 DHCP 2 2 2

Total 16 15 4

July 2010

Hiroki Nakano, Trans New Technology, Inc.Slide 4

75% off!

doc.: IEEE 802.11-10/0873r0

Submission

Other considerations

• Channel scan sometimes employs a few seconds.– This is an implementation issue.– An STA having multiple channel radio can do for a couple of

milliseconds.

• DHCP for IPv4 sometimes employs a few seconds.– This is another implementation issue.– An STA can send DHCPREQUEST as soon as receive the first

DHCPOFFER. This enables STA to complete DHCP process in a few 10 milliseconds without any violation against RFC2131 (Dynamic Host Configuration Protocol).

July 2010

Hiroki Nakano, Trans New Technology, Inc.Slide 5

doc.: IEEE 802.11-10/0873r0

Submission

Collaboration with DHCP

Pure 802.11 Collaborate with DHCP802.11 Probe Req./Resp. 1 1

FIA Auth. and Key Dist. 11

IPv4 DHCP 2

Total 4 2

July 2010

Hiroki Nakano, Trans New Technology, Inc.Slide 6

• If 802.11 provides mechanism transferring data to assign an IP address during process of 802.11, total message exchanges are reduced moreover.– But this is a minor problem.

50% off!

doc.: IEEE 802.11-10/0873r0

Submission

Conclusion

• Question– Is this enough effective to reduce the total link set up time?– Should we consider the reduction of the exchange number of the

higher layer?

• Answer– During setting up link, most time-consuming part is

“Authentication and key distribution.”– FIA tries to shorten the very part.– If 802.11 helps its upper layer, things get better.

July 2010

Hiroki Nakano, Trans New Technology, Inc.Slide 7

doc.: IEEE 802.11-10/0873r0

Submission

Questions and Comments?

July 2010

Hiroki Nakano, Trans New Technology, Inc.Slide 8

doc.: IEEE 802.11-10/0873r0

Submission

July 2010

Hiroki Nakano, Trans New Technology, Inc.Slide 9