1. More “what is 802.11u?” Date: 2006-03-08 Authors: March 2006
doc.: IEEE /0375r0
March 2006
More “what is u?”
Date:
Authors:
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Mike Moreton & Stephen McCann
Mike Moreton & Stephen McCann

2. March 2006
doc.: IEEE /0375r0
March 2006
Abstract
This document gives a longer personal overview of the aims of TGu and is an extension of an earlier presentation in WNG.
As we’re still at the “call for proposals” stage, we can’t be explicit about how these aims will be achieved.
Mike Moreton & Stephen McCann
Mike Moreton & Stephen McCann

3. March 2006
doc.: IEEE /0375r0
March 2006
Why this presentation ?
Many people do not understand what TGu is trying to achieve.
TGu assists the advertising and connection to remote services beyond the DS.
TGu provides information to the STA about the external network prior to association.
Mike Moreton & Stephen McCann
Mike Moreton & Stephen McCann

4. March 2006
doc.: IEEE /0375r0
March 2006
A User Perspective
Thursday 2nd March, Charles de Gaulle (Paris) airport (Terminal 2F)
Five broadcast SSIDs:
WIFI-PRO
HUBTELECOM
ADPTELECOM
Wireless
28CRDSG2FO103
Which one to choose?
Mike Moreton & Stephen McCann
Mike Moreton & Stephen McCann

5. A User Perspective With TGu you’ll know
March 2006
doc.: IEEE /0375r0
March 2006
A User Perspective
With TGu you’ll know
which networks provide free service,
which networks you can use based on your home subscriptions
which networks you could enrol with
which networks don’t provide any public service (so you can’t use them)
TGu provides a “virtual point of presence” for many different networks through a single AP.
Mike Moreton & Stephen McCann
Mike Moreton & Stephen McCann

6. March 2006
doc.: IEEE /0375r0
March 2006
802.11u in a Nutshell
IEEE currently assumes that you are pre-authorised to use the IEEE network
When you come to connect, you already have all the security credentials you need (if any)
TGu considers the case when you don’t
You could enrol with the network (e.g. Wi-Fi’s UAM)
You could use the network to get access to one that you do have credentials for
Hot spot roaming
Enterprise Virtual Networks
You could find a network that is advertising it will give you the service you need without credentials
“Free” services
Emergency call (E911) support
Local information services that don’t provide general Internet access
Mike Moreton & Stephen McCann
Mike Moreton & Stephen McCann

7. March 2006
doc.: IEEE /0375r0
March 2006
TGu – Why Bother?
Question: Hotspots exist, roaming agreements exist, so why do we need TGu?
Some existing solutions assume no MAC layer changes
But can be klunky, inefficient and unscalable as a result
Some existing solutions assume proprietary MAC extensions
E.g. multiple SSIDs in a Beacon or Probe Response
But these are non-standard, and hence risky and often will not scale to larger networks.
Some existing solutions use layer 3 and above (i.e. IP family) techniques to overcome problems
Assume trusted relationship between AP and network
Problems with scalability and inefficiency
No layer 2 fast roaming (TGr)
TGu exists to “do it right”
Stop hacking, and fix the problems properly
Do the bits that have to be done at L2, and leave the rest to others
Mike Moreton & Stephen McCann
Mike Moreton & Stephen McCann

8. March 2006
doc.: IEEE /0375r0
March 2006
TGu scope
Creation of a requirements document, has allowed the original PAR scope to be narrowed and clarified
Requirements document defines key clusters (objectives) which members wish to work on
Requirements reviewed by external liaison
11 liaisons sent out in September 2005
3GPP, 3GPP2, IETF, Wi-Fi Alliance, GSMA, FMCA etc
4 liaisons responses, acted upon in January 2006
Changed requirements document
Scenarios document : r7
Requirements document : r9
Mike Moreton & Stephen McCann
Mike Moreton & Stephen McCann

9. Clusters (Objectives)
March 2006
doc.: IEEE /0375r0
March 2006
Clusters (Objectives)
Network Selection
Emergency Calls
Online Enrolment
User Plane
Protection
SSPN Interface
MIH (IEEE support)
Authentication (optional)
Mandatory (battery, security, legacy)
Mike Moreton & Stephen McCann
Mike Moreton & Stephen McCann

10. Down Selection Process (part II)
March 2006
doc.: IEEE /0375r0
March 2006
Down Selection Process (part II)
For each cluster:
Step 4:
Initial Presentation
of Proposal
Step 11:
Internal Review
Mergers? Y
Step 5:
Carry out mergers
etc. N
Step 12:
Vote on whether to
forward to WG
Step 6:
Discard Unmerged
Proposals (partial)
Step 10:
Combine Cluster
Proposals
>1
Proposal? Y
Step 7:
Elimination
Procedure
>75%? N
Step 9: includes getting comments from no voters etc.
Step 10: can start once one or more clusters have been addressed (i.e. a single solution for a particular cluster has been selected and confirmed).
Step 11: includes checking all mandatory requirements have been met.
Start of each meeting it might be nice to confirm the latest draft document produced by editor, plus have a confirmation vote to approve the latest draft. N
Step 8:
Confirmation
Vote Y
Step 13:
Forward to WG
for LB
<75%? Y
Step 9:
No Vote
Resolution N
Mike Moreton & Stephen McCann
Mike Moreton & Stephen McCann

11. Clusters - backup Network Selection Emergency Calls March 2006
doc.: IEEE /0375r0
March 2006
Clusters - backup
Network Selection
Advertisement of external network capabilities prior to association.
This includes discovery of appropriate roaming relationships prior to association with the network to prevent users having to select networks on a trial and error basis.
The additional information can be used to support more sophisticated network selection algorithms in user devices and make selection of hotspot services more user friendly.
Emergency Calls
Support of emergency calls through advertisement of capability and refined admission control
This is intended to enable emergency call service support in any hotspot where regulations indicate that it is needed. The main issue is to provide access to the emergency services when the user has no credentials with which to gain access to the access network.
Mike Moreton & Stephen McCann
Mike Moreton & Stephen McCann

12. Clusters - backup Online Enrolment User Plane Protection
March 2006
doc.: IEEE /0375r0
March 2006
Clusters - backup
Online Enrolment
Assistance with enrolment in a foreign hotspot
User Plane
Provide consistent user experience for interworking service across different deployments and manage segregation of traffic associated with different service providers
Protection
Ability to protect user identity as they move between different public hotspots
SSPN Interface
Support for application of operator policy to subscriber traffic in the hotspot
MIH (IEEE support)
Support of the IEEE Media Independent Handover capability for technology
Authentication (optional)
Ability to authenticate with various providers simultaneously.
This is intended to support scenarios where users may wish to access services provided by different service providers simultaneously using different subscriptions.
Mike Moreton & Stephen McCann
Mike Moreton & Stephen McCann