doc.: ieee 802.11-13/1313r2 submission november 2013 stephen mccann, blackberryslide 1 tgaq mini...
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doc.: IEEE /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.TRANSCRIPT
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 [email protected]
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