doc.: IEEE 802.11-13/1313r2

Submission

November 2013

Stephen McCann, BlackberrySlide 1

TGaq Mini TutorialDate: 2013-11-13

Name Company Address Phone email

Stephen McCann Blackberry Ltd 200 Bath Road, Slough, Berkshire, SL1 3XE, UK

+44 1753 667099 smccann@blackberry.com

Authors:

doc.: IEEE 802.11-13/1313r2

Submission

November 2013

Stephen McCann, BlackberrySlide 2

Abstract

TGaq Mini-TutorialSummary of Study Group and Task Group

work to date.

doc.: IEEE 802.11-13/1313r2

Submission

November 2013

Stephen McCann, BlackberrySlide 3

Rationale

• Existing pre-association GAS provides little detail about network services.

• Current mechanism which is to sequentially associate to available networks for discovery purposes is time consuming and potentially costly.

• Existing peer to peer discovery mechanisms flood the channel with pre-association traffic.

• Need to reduce power consumption through the use of efficient signalling.

doc.: IEEE 802.11-13/1313r2

Submission

November 2013

Stephen McCann, BlackberrySlide 4

Study Group Phase

• Started November 2012• Service Discovery concept appeared in Fall 2012• Device discovery well established• GAS

– ANQP– RLQP

• Considered mechanisms to discover available services provided by infrastructure.– IMS– Printers

doc.: IEEE 802.11-13/1313r2

Submission

November 2013

Stephen McCann, BlackberrySlide 5

Development of PAR & 5C

• Occurred about the same time as Service Discovery groups started in the Wi-Fi Alliance.

• No initial intention for Wi-Fi Alliance to build on TGaq. More of a co-incidental start.

• TGaq PAR narrowed to avoid overlaps with Wi-Fi Alliance– Specifically avoid peer to peer service discovery

doc.: IEEE 802.11-13/1313r2

Submission

November 2013

Stephen McCann, BlackberrySlide 6

TGaq Scope

• This amendment defines modifications to the IEEE 802.11 standard, above the physical layer (PHY), to enable delivery of pre-association Service Discovery information by IEEE 802.11 stations (STAs).

doc.: IEEE 802.11-13/1313r2

Submission

November 2013

Stephen McCann, BlackberrySlide 7

Progress to date• Use cases collected (22)

– Use case analysis complete– 11-13-0118-00-00aq-summary-of-pad-sg-use-cases.ppt

• Use case analysis document– Main features of use cases at MAC layer– 11-13-0125-06-00aq-use-case-analysis.docx

• Terminology document– Re-using IEEE definitions where available– 11-13-0299-03-00aq-draft-tgaq-terminology.docx

• Specification Framework Document– In progress at an early stage– 11-13-0300-01-00aq-proposed-specification-framework-for-

tgaq.docx

doc.: IEEE 802.11-13/1313r2

Submission

November 2013

Stephen McCann, BlackberrySlide 8

Example Use Case• You enter IEEE meeting hotel and want to find a printer• You notice that there are many WLANs in the hotel

– Networks with printers:• Hyatt: The hotel printer (free for hotel guest and 24/7 availability)• Verilan: The printer in IEEE staff office (located in a secured environment, available

9am-5pm to non-IEEE-staff)• FedEx/Kinko’s Office WLAN with one printer associated with (not free, office hours

only; but has richer features)– and many other networks (e.g. AT&T) without printers.

• association may require payment, only to discover that printer service is inappropriate

• Problem is to determine which network to use prior to selection:– It is 1pm. You are sensitive to the security. – It is 9pm. You want high-quality print-out and cost is not an issue.– It is 11pm. You are sensitive to costs.

doc.: IEEE 802.11-13/1313r2

Submission

November 2013

Stephen McCann, BlackberrySlide 9

Initial Proposals

• Pre-association messages (PAD)– Likely to be based on GAS

• Container MAC protocol to carry upper layer service discovery protocols (e.g. UPnP, Bonjour)

• Provisioning and configuration of service in AP– Proxy service server connected to AP

• Universal identification of services– Use a hashing algorithm– UUID, a reverse domain notation, a registry of service IDs.

• Broadcast Concept– Advertisement of service information through broadcast frames.

doc.: IEEE 802.11-13/1313r2

Submission

Proposed Architecture for 802.11aq• Extend 802.11u to support service discovery or• Define a new Service Discovery Protocol?

Slide 10

STA AP Service

GAS

ANQP…

802.11 Scope Not in Scope of 802.11

Extend ANQP ordefine new servicequery protocol

Service query protocol

Up-layer servicediscovery protocol

Probe

November 2013

Stephen McCann, Blackberry

doc.: IEEE 802.11-13/1313r2

Submission

November 2013

Stephen McCann, BlackberrySlide 11

AP1

AP2

STA

Network

Local Access Network Service

Transaction Proxy (TPX)

Pre-association Messages

Service Query Messages

doc.: IEEE 802.11-13/1313r2

Submission

STA

AP

Beacon

Probe Proberesponse

Slide 12

STA

S1: AP/Network Discovery + Service Indication

Services from Network

S2: Detailed Service QueryBased on Service Indication

GAS

Recapture: Two step service discovery

Services from associated device

Service Record

Service Indication

Service Indication, e.g. Service Bitmap

Service Indication, e.g. Service Bitmap

November 2013

Stephen McCann, Blackberry

doc.: IEEE 802.11-13/1313r2

Submission

November 2013

Stephen McCann, BlackberrySlide 13

Other Concepts

• Peer Service Discovery (PSDisc) design framework– Independent mode discovery (few STAs)– Server mode discovery (many STAs)

• Provisioning of Services by Associated STAs– Registration with an AP or Proxy Server

• SoftAP operation– Indicate provision of Internet connectivity– Indicate upper layer support– Lightweight and energy efficient method is desirable

• Pre-association discovery for neighboring APs– Do PAD when the STA is still in association

doc.: IEEE 802.11-13/1313r2

Submission

November 2013

Stephen McCann, BlackberrySlide 14

Construction of Draft

• Build on Specification Framework Document• Normative text submissions considered this week

doc.: IEEE 802.11-13/1313r2

Submission

November 2013

Stephen McCann, BlackberrySlide 15

Timeline – November 2013 • Approval of PAR & 5C: November 2012• Initial TG meeting: January 2013• Initial Working Group Letter Ballot: July 2014• Re-circulation Working Group Letter Ballot: November

2014• Form Sponsor Ballot Pool: May 2015• Mandatory Editorial Check: November 2015• Initial Sponsor Ballot: November 2015• Sponsor Ballot Recirculation: January 2016• Final WG/EC Approval: May 2016• RevCom/Standards Board Approval: May 2016