Submission

doc.: IEEE 11-12-1238-01-00aiNovember 2012

Lei Wang, InterDigital CommunicationsSlide 1

Proposals for the FD Frame Capability, Security and Neighbour AP Information Content Design

Date: 2012-11-15

Name Affiliations Address Phone email

Lei Wang InterDigital Communications

781 Third Ave. King of Prussia, PA 19406

858-205-7286 Leiw@billeigean.com

Authors:

Submission

doc.: IEEE 11-12-1238-01-00aiNovember 2012

Lei Wang, InterDigital CommunicationsSlide 2

Abstract

This contribution is intended to continue the discussion about a detailed design of the FILS Discovery (FD) Frame content items, including FD Capability, FD Security, and FD Neighbor AP information.

This contribution provides supporting materials for the 802.11ai draft specification document text proposal for a detailed design of the FD frame contents in Contribution, 12/1236.

Submission

doc.: IEEE 11-12-1238-01-00aiNovember 2012

Lei Wang, InterDigital CommunicationsSlide 3

Conformance w/ TGai PAR & 5C Conformance Question Response

Does the proposal degrade the security offered by Robust Security Network Association (RSNA) already defined in 802.11?

No

Does the proposal change the MAC SAP interface? ??

Does the proposal require or introduce a change to the 802.1 architecture? No

Does the proposal introduce a change in the channel access mechanism? No

Does the proposal introduce a change in the PHY? No

Which of the following link set-up phases is addressed by the proposal?(1) AP Discovery (2) Network Discovery (3) Link (re-)establishment / exchange of security related messages (4) Higher layer aspects, e.g. IP address assignment

1,2

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital Communications

November 2012

Slide 4

Background• Progress has been made regarding the FILS Discovery Frame

content design in the TGai September meetings, e.g., reached a general consensus for a detailed design for: SSID, Access Network Options, AP’s Next TBTT, AP Configuration

Change Count;

• However, 3 content items are still remaining to be designed in details: Capability, Security, and Neighbor AP’s Next TBTT information

• This contribution continues the discussions of detailed designs for those three content items.

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital Communications

Capability Info Item in FILS Discovery Frame-- Recap from Contribution 12/1030

• Discussion points from2012-July meeting (12/0913r3) It is one of the optional info items in FD frame; Its purpose is to provide info for AP/Network initial de-selection; Additional discussion about the Support data rates

o Attempt to eliminate the supported rates element, by using the reserved bits in capability info field to indicate the identified minimum rates.

• Reference materials identified in 2012-July meeting (12/0913r3) Beacon/Probe Response in 802.11-2012 speco Capability info field: p438, section 8.4.1.4o Supported Rates element, p478, 8.4.2.3o Extended Capabilities element, p562, section 8.4.2.29o Neighbor Report element, 8.4.2.39

Measurement Pilot frame 11ah short beacon (11/1503r2, 12/0129r3)

• Further Design Considerations What capability indicators are needed in FD frame?

Detailed encodings of the capability indicators?Slide 5

November 2012

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital Communications

Capability Info Item in FILS Discovery Frame – con’tRecap from Contribution 12/1030

• Proposal: Design a fixed-size new capability field in FD frame, e.g., 3 bytes;

Use the 2-byte Capability field as defined in Figure 8-38 in 802.11-2012 as starting point; and remove the unnecessary subfields for FD frame uses, e.g., o DSSS-OFDM

o PBCC

o Channel Agility

o APSD

Add some new info items, e.g.,o Supported minimum rate

o PHY type

o IPv4 / IPv6 support

Use a 1-bit indicator in the FD frame control field to indicate the presence of the Capability info item in the FD frame.

Slide 6

November 2012

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital CommunicationsSlide 7

November 2012

FD Capability

ESS IBSSCF

PollableCF-PollRequest

PrivacyShort

PreambleIPv4

supportIPv6

support

Spectrum mgmg

QoSShort Slot

TimeReserved

Radio mgmt

ReservedDelayed Bloack

Ack

Immediate Ack

PHY Type (4 bits) Supported Minimum Rate (4 bits)

b0 b1 b2 b3 b4 b5 b6 b7

b8 b9 b10 b11 b12 b13 b14 b15

b16 b17 b18 b19 b20 b21 b22 b23

LSB 4 bits of dot11PHYType 4-bit code defined as follows:0b0000: 1 Mbps0b0001: 2 Mbps0b0010: 6.5 Mbps0b0011: 13 Mbps????

IPv4 support indicator: 0b0: not supported0b1: supported

IPv6 support indicator: 0b0: not supported0b1: supported

Capability Info Item in FILS Discovery Frame – con’tRecap from Contribution 12/1030

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital CommunicationsSlide 8

November 2012

ESS Privacy QoSMultiple

BSSID IE Used

Reserved

IPv4 support

IPv6 support

Operation Channel Bandwidth

Nss (Number of Spatial Streams)

PHY Type (4 bits) Supported Minimum Rate (4 bits)

b0 b1 b2 b3 b4 b5 b6 b7

b8 b9 b10 b11 b12 b13 b14 b15

b16 b17 b18 b19 b20 b21 b22 b23

4-bit supported Minimum rate:0: 1 Mbps1: 6 Mbps2: 11 Mbps3: 12 Mbps4: 24Mbps5 – 15: Reserved

3-bit Operation Channel bandwidth0: 20/22 MHz1: 40 MHz2: 80 MHz3: 160 or 80+80MHz4 – 8: Reserved

3-bit Nss0: 11: 22: 33: 44: 5-85 – 8: Reserved

4-bit PHY Type:0: DSSS/HR (11b)1: OFDM/ERP (11a/g)2: HT (11n)3: VHT (11ac)4 – 15: Reserved

Capability Info Item in FILS Discovery Frame

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital Communications

Security Info Item in FILS Discovery Frame-- Recap from Contribution 12/1030

• Discussion points from 2012-July meeting (12/0913r3) It is one of the optional info items in FD frame; Its purpose is to provide info for AP/Network initial de-selection;

• Reference materials RSNE in Section 8.4.2.27 in 802.11-2012 spec

• Further Design Considerations What Security indicators are needed in FD frame?

Detailed encodings of the Security indicators?

Slide 9

November 2012

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital Communications

Security Info Item in FILS Discovery Frame (con’t)-- Recap from Contribution 12/1030

• Proposal: Design a fixed-size new Security field in FD frame, e.g., 4 bytes;

Use the RSNE as defined in Section 8.4.2.27 in 802.11-2012 as starting point; and consider changes to make it smaller in size, e.g., o Re-design the RSN Capabilities subfield to reflect its practical uses and 11ai specific

considerations;

o Limit the numbers of Pairwise suites and AKM suites, e.g., 2 for each

o Introduce 4-bit codes to identify Cipher Suites and AKM Suites

o Remove PMKID count and PMLID list

Add some new info items, e.g.,o Security capability indicators for FILS authentication methods support, e.g.,

FILS Fast-EAP based authentication

FILS EAP-RP based authentication

FILS Non-EAP Fast authentication

FILS Fast Authentication without 3rd-party

Use a 1-bit indicator in the FD frame control field to indicate the presence of the Security info item in the FD frame.

Slide 10

November 2012

Submission

doc.: IEEE 11-12-1238-01-00ai

Slide 11 Lei Wang, InterDigital Communications

November 2012

Cipher Suite Selectors, including Group Data, Group Mgmt, and Pairwise cipher suite selectors, are of 4-bit codes defined to identify the Cipher Suite Types specified in Table 8-99 in 802.11-2012:0b0000 to 0b0111: Suite Type 0 to 7;0b1000 to 0b1110: Reserved0b1111: no cipher suite selected.

AKM Suite Selectors are of 4-bit codes defined to identify the AKM Suite Types specified in Table 8-101 in 802.11-2012:0b0000 to 0b1001: Suite Type 0 to 9;0b1010 to 0b1110: Reserved0b1111: no AKM suite selected.

FD Security

Pre-authentication

Mgmt frame Protection required

FILS Fast EAP

FILS EAP-RP

FILS Non-EAP

FILS Auth Without 3rd

party

Mgmt Frame

Protection capable

Perfect Forward Secrecy

Group Data Cipher Suite Selector(4 bits)

Pairwise Cipher Suite Selector 1(4 bits)

b0 b1 b2 b3 b4 b5 b6 b7

b8 b9 b10 b11 b12 b13 b14 b15

b24 b25 b26 b27 b28 b29 b30 b31

Group Mgmt Cipher Suite Selector(4 bits)

Pairwise Cipher Suite Selector 2(4 bits)

AKM Suite Selector 1(4 bits)

AKM Suite Selector 2(4 bits)

b18 b19 b20 b21 b22 b23b16 b17

Security Info Item in FILS Discovery Frame (con’t)-- Recap from Contribution 12/1030

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital Communications

Neighbor AP’s TBTT Info Item in FILS Discovery Frame

• Discussion points from 2012-July meeting (12/0913r3) It is one of the optional info items in FD frame;

Its purpose is to enable optimizations for multiple APs/Channels scanning.

• Reference materials in 802.11-2012 Neighbor report element, Section 8.4.2.39;

Beacon timing IE, Section 8.4.2.107, for neighbor's next beacon Tx time;

AP channel report IE, Section 8.4.2.38

• Additional reference material: Reduced Neighbor AP Report: 12/1054r2 and 12/1098r5

• Design Considerations cannot use a value from the transmitting AP’s timestamp or the neighbor AP’s

timestamp to indicate the neighbor AP’s next TBTT, due to the un-synchronized status of the STA and the APs;

Use Operating Class / Operating Channel to identify where to find neighbor APs;

Allow multiple APs/TBTTs on the same channelSlide 12

November 2012

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital Communications

Neighbor AP’s TBTT Info Item in FILS Discovery Frame – con’t• Proposal:

Use a 2-byte info field to identify the Channel for neighbour AP(s):o Operating Class subfield: 1 byte, an enumerated value defined in Annex E in

802.11-2012 specifying the operating class of the neighbour AP;

o Channel Number subfield: 1 byte, an enumerated value defined in Annex E in 802.11-2012 specifying the operating class within the Operating Class of the neighbor AP;

Use an 1-byte Next TBTT subfield: an offset value, in unit of TU, specifying the time between the FD frame Tx time and a Neighbour AP’s next TBTT.

Use a more compressed encoding (comparing to the Reduced Neighbor AP Report IE) to:o Allow multiple neighbor AP’s TBTT info fields for the same channel;

o Allow multiple channels to be included;

Use an 1-bit indicator in the FD frame control field to indicate the presence of Neighbor APs’ TBTT info in the FD frame.

Slide 13

November 2012

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital Communications

Neighbor AP’s TBTT Info Item in FILS Discovery Frame – con’t

Slide 14

November 2012

FD Neighbor APs’ Next TBTT Info

NAPI ControlOP

ClassOP CH

AP 1 TBTT

AP 2 TBTT

AP k1 TBTT

…... OP Class

OP CHAP 1 TBTT

AP 2 TBTT

AP kn TBTT

…...…...

OP Class / OP Channel 1 OP Class / OP Channel n

Bytes 11 1 1 1 11 1 1 11

2+k1 bytes 2+kn bytes

Number of OP Class /OP channels

(n)

Number of AP/TBTTs

(k1)

Number of AP/TBTTs

(k2)

Number of AP/TBTTs

(kn)

Bits 2 2 2 2

Format of Neighbor APs’ Next TBTT Information Control Field (NAPI Control)(size = 1 byte

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital Communications

Neighbor AP’s TBTT Info Item in FD Frame – con’t

Slide 15

November 2012

NAPI Control

OP Class

OP CH

AP 1 TBTT

AP 2 TBTT

OP Class

OP CH

AP 1 TBTT

AP 2 TBTT

OP Class / OP Channel 1 OP Class / OP Channel 2

Bytes 11 1 1 11 1 11

4 bytes 4 bytes

Number of OP Class /OP channels

(n=2)

Number of AP/TBTTs(k1=2)

Number of AP/TBTTs(k2=2)

Bits 4 2 2

Format of Neighbor APs’ Next TBTT Information Control Field (NAPI Control)(size = Ceiling((4+2*2)/8) = 1 byte)

Example-1: Two Channels, each with two APs(9 bytes, comparing at 14 bytes if using Reduced Neighbor Report IE

NAPI Control

OP Class

OP CH

AP 1 TBTT

AP 2 TBTT

OP Class

OP CH

AP 1 TBTT

AP 2 TBTT

OP Class / OP Channel 1

OP Class / OP Channel 2

Bytes 11 1 111 1 12

3 bytes 5 bytes

Number of OP Class /OP channels

(n=3)

Number of AP/TBTTs(k1=1)

Number of AP/TBTTs(k2=3)

Bits 4 2 2

Format of Neighbor APs’ Next TBTT Information Control Field (NAPI Control)(size = Ceiling((4+2*3)/8) = 2 bytes)

Example-2: Three Channels, one with 1 AP, another one with 3 APs, and the 3rd one with 2 APs(14 bytes, comparing at 20 bytes if using Reduced Neighbor Report IE)

OP Class

OP CH

AP 1 TBTT

OP Class / OP Channel 3

11 1

4 bytes

Number of AP/TBTTs(k1=2)

AP 3 TBTT

1

Pad(6 bits)

2 6

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital Communications

Discussion on FD Frame Body Extensibility

• The proposed FD frame body design is extendible, when needed;

• Two basic mechanisms: Use the available bits in the FD frame control field;

Use optional information elements.

Slide 16

November 2012

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital Communications

Straw-Polls

Straw-Poll-1:

Do you support the proposal of the FILS Discovery (FD) capability info item encoding as described in Slide 7 of this contribution?

Result Yes No Abstain_______________

Slide 17

November 2012

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital Communications

Straw-Polls

Straw-Poll-2:

Do you support the proposal of the FILS Discovery (FD) Security info item encoding as described in Slide 10 of this contribution?

Result Yes No Abstain_______________

Slide 18

November 2012

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital Communications

Straw-Polls

Straw-Poll-3:

Do you support the proposal of the FILS Discovery (FD) Neighbor APs’ Next TBTT info item encoding as described in Slide 13 of this contribution?

Result Yes No Abstain_______________

Slide 19

November 2012

Submission

doc.: IEEE 11-12-1238-01-00ai

Lei Wang, InterDigital Communications

November 2012

Slide 20

References:• IEEE Std 802.11™-2012

• 11-12-0151-13-00ai-proposed-specification-framework-for-tgai

• 11-12-0913-03-00ai-paasive-scanning-discussions

• 11-12-0741-01-00ai-discussions-about-fils-discovery-frame-content-design

• 11-12-0406-05-00ai-passive-scanning-improvements-draft

• 11-12-0669-01-00ai-passive-scanning-improvements-ad-hoc-report

• 11-12-0742-00-00ai-FILS-Discovery-Frame-Format-Discussions

• 11-11-1137-09-00ah-specification-framework-for-tgah

• 11-11-1503-02-00ah-short-beacon

• 11-12-0129-03-00ah-short-beacon

• 11-11-1031-00-00ai-air-time-consumption-by-beacon-and-probe

• 11-12-0053-01-00ai-gas-version-control-including-normative-text

• 11-12-0158-03-00ai-proposed-additions-to-sfd

• 11-12-1029-00-00ai-FILS-Discovery-Frame-Format-Discussions

• 11-12-1054-02-00ai-fils-reduced-neighbor-report

• 11-12-1236-00-00ai-spec-text-for-FD-Frame-Definition