May 2013
doc.: IEEE 802.11-13/0429r1
TGaq Design Options for IBSS
Authors:
Name
Joe Kwak
Joe Levy
Company
InterDigital
Communications
InterDigital
Communications
Address
Hawkesbury, ON
Canada
Melville, NY
Phone
email
+01-630-739-4159
[email protected]
+01-631-622-4139
Joseph.Levy@InterDigital
.com
Date: 2013-05-15
Submission
Slide 1
Joe Kwak, InterDigital
May 2013
doc.: IEEE 802.11-13/0429r1
Summary
The design options discussed at prior
11aq meetings may be adequate for service
discovery for BSS use cases. However
several use cases are clearly IBSS cases
and are not served by options noted in
13/0057r2. This presentation expands the
design options under discussion to include
the IBSS use cases for PAD.
Submission
Slide 2
Joe Kwak, InterDigital
May 2013
doc.: IEEE 802.11-13/0429r1
IBSS is important in many aspects of our lives
•
•
At home or at work, our BSS networks satisfy our needs.
BUT AT ALL OTHER TIMES, we are on the move and our mobile WiFi
devices have no “home network” with which to associate.
– Commuting: waiting for the bus, in the subway, on the street...
– In public places: malls, restaurants, stadiums, etc
– While waiting: in dentist office, at a hospital, in a restaurant, in customs line at
airport....
•
•
We fidget with our phones, check messages and mails, but have no way to
discover the WiFi services in the devices all around us.
These OTHER TIMES may be brief but are perfect for new diversions
and recreations:
–
–
–
–
•
Find your Facebook/LinkedIn friends in the immediate area
Play a game you really enjoy with a fellow traveller in the waiting line
Chat/rant with others in local IBSS chat room
Share your music, pictures and favorite videos
A richer personal life may enabled by IBSS PAD to find these new
connections and diversions to enjoy in our otherwise idle moments , when
out of reach of a BSS.
Submission
Slide 3
Joe Kwak, InterDigital
May 2013
doc.: IEEE 802.11-13/0429r1
PAD discovery works differently in BSS and IBSS
• For BSS discovery, services are provided by network
– User needs service info about access network options
•
•
•
•
Which APs offer which SP connections?
Which APs have available BW and admission capacity?
Which APs have connection to services user seeks?
....etc.
– PAD access to ANQP info and legacy discovery protocols provide all of these.
• For IBSS discovery, services are provided by peers
– User needs service info about peers in radio range
• IBSS formation limited by radio range. All STAs in IBSS
communicate with eachother.
• Peer service information is needed
– User’s available sharing applications (services)
– User’s handle and membership level
– User’s MAC ID for possible P2P connection
Submission
Slide 4
Joe Kwak, InterDigital
May 2013
doc.: IEEE 802.11-13/0429r1
13/0125r4: PAD use cases in an IBSS
• #21 Max needs a cab: User is in transit on the
metropolitan street and has an Taxi application for P2P
connection to other STAs with same Taxi application.
• #23 Gaming: User searching for peer STA with same
gaming app. Airline lounge has AP which facilitates
discovery of peer for P2P connection. BUT for airline
lounge without AP, use case requires IBSS discovery of
same peer.
• #8, #11, and #20 are use cases accessing free public
information which could also easily be accommodated
by IBSS model.
• No actual BSS association is needed if use case is
satisfied in IBSS with P2P connection.
Submission
Slide 5
Joe Kwak, InterDigital
May 2013
doc.: IEEE 802.11-13/0429r1
Discussed options inadequate for IBSS cases
•
11-13-0057-02-00aq-design-options describes simple methods to
provide PAD service discovery for BSS cases
–
–
–
•
Simple new protocol using a Discovery Proxy Server (DPS) as
intermediary for STAs in pre-associated state. The intermediary
provides discovery using existing discovery protocols, e.g. UPnP,
bonjour etc.
GAS protocol may also be used for network service advertisements
New ANQP/GAS information items may also be created.
These options will not work well for IBSS use cases
–
–
–
Submission
Without DS access, IBSS STAs cannot communicate with DPS.
In a BSS, GAS/ANQP services are provided by an AP or a network based server.
IBSS STAs do not communicate with an AP and have no internet access to
servers.
Though the GAS framework allows advertising in IBSS, no protocol is defined to
describe how this can work in a dynamic IBSS, serving mobile smartphones and
other transient STAs
Slide 6
Joe Kwak, InterDigital
May 2013
doc.: IEEE 802.11-13/0429r1
IBSS PAD use cases require additional options
•
GAS/ANQP may work for IBSS but would require:
–
–
–
Submission
Adverts would need new information elements describing each
possible service, or alternatively a new, flexible service
description which could describe any possible service.
ANQP advertised elements are mostly preconfigured, of fixed
size, and when not fixed are limited in size by 2 octet length field.
May not be adequate for transporting aggregated service
descriptors for a dynamic IBSS.
If a modified framework for ANQP were used, the standard
would need to define protocol for IBSS to collect the relevant
service availability information to populate the ANQP items for
the current members of the IBSS. May need to define protocol to
dynamically create new ANQP advertisements in a constantly
changing IBSS.
Slide 7
Joe Kwak, InterDigital
May 2013
doc.: IEEE 802.11-13/0429r1
PAD for IBSS has some unique requirements
• Most IBSSs would be ad-hoc networks of battery operated
mobiles. Power efficiency is a more crucial requirement in
IBSS than in BSS.
• IBSS discovery needs to be scalable for use in large public
venues. Hundreds and more users in streets, halls, and
stadiums, most of which are not served by traditional WiFi
APs.
• Similar to beaconing in IBSS, power burden for PAD
discovery needs to be distributed among all users of IBSS
discovery.
• Similar to ATIM window in IBSS, access to IBSS
discovery needs to be synchronized for power savings.
Submission
Slide 8
Joe Kwak, InterDigital
May 2013
doc.: IEEE 802.11-13/0429r1
Conclusions
• Pre-association discovery use cases include discovery
where no BSS may exist.
• Pre-association discovery in an IBSS is an important
complement to PAD in the BSS cases.
• The goal of pre-association discovery is different for
BSS (network services) and IBSS (peer services).
• IBSS PAD may have unique requirements.
• TG 11aq can provide solutions for pre-association
discovery in both BSS and IBSS.
Submission
Slide 9
Joe Kwak, InterDigital
May 2013
doc.: IEEE 802.11-13/0429r1
Discussion and Questions
Thank you.
Submission
Slide 10
Joe Kwak, InterDigital
May 2013
doc.: IEEE 802.11-13/0429r1
STRAWPOLLS
• Should 11aq amendment include provisions for
PAD IBSS use cases?
• Yes
• No
• Need more information
• Would you be willing to collaborate with others to
jointly develop a PAD proposal for IBSS?
• Yes
• No
• Undecided/maybe
Submission
Slide 11
Joe Kwak, InterDigital