1. TGaq Mini Tutorial Date: 2013-11-13 Authors: November 2013
doc.: IEEE /1313r3
November 2013
TGaq Mini Tutorial
Date:
Authors:
Stephen McCann, Blackberry
Stephen McCann, Blackberry

2. Summary of Study Group and Task Group work to date.
November 2013
doc.: IEEE /1313r3
November 2013
Abstract
TGaq Mini-Tutorial
Summary of Study Group and Task Group work to date.
Stephen McCann, Blackberry
Stephen McCann, Blackberry

3. November 2013
doc.: IEEE /1313r3
November 2013
Rationale
Existing pre-association GAS provides little detail about network services.
Current mechanisms sequentially associate to available networks for discovery purposes. These are time consuming and potentially inefficient.
Existing peer to peer discovery mechanisms flood the channel with pre-association traffic.
Need to reduce power consumption through the use of efficient signalling.
Stephen McCann, Blackberry
Stephen McCann, Blackberry

4. Study Group Phase Started November 2012
doc.: IEEE /1313r3
November 2013
Study Group Phase
Started November 2012
Service Discovery concept appeared in Fall 2012
Device discovery well established
GAS – Generic Advertisement Service
ANQP – Access Network Query Protocol (11u)
RLQP – Registered Location Query Protocol (11af)
Considered mechanisms to discover available services provided by infrastructure.
IMS – IP Multimedia Subsystem
Printers
Stephen McCann, Blackberry
Stephen McCann, Blackberry

5. There is interest in service discovery in the industry
November 2013
doc.: IEEE /1313r3
November 2013
There is interest in service discovery in the industry
IEEE
Created new TGaq based on PAR:
pad-draft-par-proposal.doc
WFA
Sent Liaison to WFA (Nov 2012) and requested feedback.
liaison-to-wfa aq-par.doc
No comments were returned.
IETF
RFC 6763 – DNS Service Discovery
Wireless Broadband Alliance
Next Generation Hotspots, for network discovery and selection
Stephen McCann, Blackberry
Stephen McCann, Blackberry

6. November 2013
doc.: IEEE /1313r3
November 2013
TGaq Scope
This amendment defines modifications to the IEEE standard, above the physical layer (PHY), to enable delivery of pre-association Service Discovery information by IEEE stations (STAs).
Stephen McCann, Blackberry
Stephen McCann, Blackberry

7. Progress to date Use cases collected (22) Use case analysis document
November 2013
doc.: IEEE /1313r3
November 2013
Progress to date
Use cases collected (22)
Use case analysis complete
aq-summary-of-pad-sg-use-cases.ppt
Use case analysis document
Main features of use cases at MAC layer
aq-use-case-analysis.docx
Terminology document
Re-using IEEE definitions where available
aq-draft-tgaq-terminology.docx
Specification Framework Document
In progress at an early stage
aq-proposed-specification-framework-for-tgaq.docx
Stephen McCann, Blackberry
Stephen McCann, Blackberry

8. November 2013
doc.: IEEE /1313r3
November 2013
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.
Stephen McCann, Blackberry
Stephen McCann, Blackberry

9. Initial Proposals Pre-association messages (PAD)
November 2013
doc.: IEEE /1313r3
November 2013
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 services 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.
Stephen McCann, Blackberry
Stephen McCann, Blackberry

10. Proposed Architecture for 802.11aq
November 2013
Proposed Architecture for aq
Extend u to support service discovery or
Define a new Service Discovery Protocol?
Scope
Not in Scope of
STA AP
Service
Service
query protocol
ANQP…
GAS
Probe
Extend ANQP or
define new service
query protocol
Up-layer service
discovery protocol
Stephen McCann, Blackberry

11. November 2013 November 2013 doc.: IEEE 802.11-13/1313r3
Stephen McCann, Blackberry
Stephen McCann, Blackberry

12. Recapture: Two step service discovery
November 2013
Recapture: Two step service discovery
S2: Detailed Service Query
Based on Service Indication
Services
from Network
STA
GAS AP
STA
Service Record
Services
from associated
device
S1: AP/Network Discovery + Service Indication
Service Indication
Service Indication, e.g. Service Bitmap
Beacon
Probe
Probe
response
Stephen McCann, Blackberry

13. Other Concepts Peer Service Discovery (PSDisc) design framework
November 2013
doc.: IEEE /1313r3
November 2013
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
Stephen McCann, Blackberry
Stephen McCann, Blackberry

14. Construction of Draft Build on Specification Framework Document
November 2013
doc.: IEEE /1313r3
November 2013
Construction of Draft
Build on Specification Framework Document
Normative text submissions considered this week
Stephen McCann, Blackberry
Stephen McCann, Blackberry

15. Timeline – November 2013 Approval of PAR & 5C: November 2012
doc.: IEEE /1313r3
November 2013
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
Stephen McCann, Blackberry
Stephen McCann, Blackberry