1. TGaq Design Options for IBSS
March 2013
doc.: IEEE /0xxxr0
May 2013
TGaq Design Options for IBSS
Authors:
Date:
Joe Kwak, InterDigital
Joe Kwak, InterDigital

2. March 2013
doc.: IEEE /0xxxr0
Summary
May 2013
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.
Joe Kwak, InterDigital
Joe Kwak, InterDigital

3. IBSS is important in many aspects of our lives
March 2013
doc.: IEEE /0xxxr0
May 2013
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 security 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.
Joe Kwak, InterDigital
Joe Kwak, InterDigital

4. PAD discovery needs to work in BSS and IBSS
March 2013
doc.: IEEE /0xxxr0
May 2013
PAD discovery needs to work 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.
Peer service information is needed
User’s available sharing applications
User’s handle and membership level
User’s MAC ID for possible P2P connection
Joe Kwak, InterDigital
Joe Kwak, InterDigital

5. 13/0125r4: PAD use cases in an IBSS
March 2013
doc.: IEEE /0xxxr0
May 2013
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 connection is needed if use case is satisfied in IBSS in pre-associated state.
Joe Kwak, InterDigital
Joe Kwak, InterDigital

6. Discussed options inadequate for IBSS cases
March 2013
doc.: IEEE /0xxxr0
May 2013
Discussed options inadequate for IBSS cases
aq-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
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
Joe Kwak, InterDigital
Joe Kwak, InterDigital

7. IBSS PAD use cases require additional options
March 2013
doc.: IEEE /0xxxr0
May 2013
IBSS PAD use cases require additional options
GAS/ANQP may work for IBSS but would require:
New information elements for each possible service, or alternatively a new, flexible service description method 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.
Joe Kwak, InterDigital
Joe Kwak, InterDigital

8. PAD for IBSS has some unique requirements
March 2013
doc.: IEEE /0xxxr0
May 2013
PAD for IBSS has some unique requirements
Most IBSSs are ad-hoc networks of battery operated mobiles. Power efficiency is more crucial requirement in IBSS.
IBSS discovery needs to be scalable for use in all large public venues. Hundreds or more users in streets, halls, and stadiums, most of which are not served by traditional WiFi APs.
Similar to beaconing in IBSS, 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.
Joe Kwak, InterDigital
Joe Kwak, InterDigital

9. March 2013
doc.: IEEE /0xxxr0
May 2013
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 focus of pre-association discovery is different for IBSS.
IBSS PAD may have unique requirements.
TG 11aq will provide solutions for pre-association discovery in both BSS and IBSS.
Joe Kwak, InterDigital
Joe Kwak, InterDigital