1. Jari Arkko Bernard Aboba
November 2004
Network Selection Problem Definition Draft-ietf-eap-netsel-problem-01.txt
Jari Arkko
Bernard Aboba
Jari Arkko & Bernard Aboba

2. Outline History and Status The basic problem Issues November 2004
Jari Arkko & Bernard Aboba

3. November 2004
History and Status
Draft -00 created based on EAP WG discussions that started with Farid Adrangi’s draft
Additional work during the last few months:
NAIbis in RADEXT WG
Farid Adrangi’s EAP network discovery draft
The Wolfgang Groeting draft and implementation results
IEEE WIEN network selection work
3GPP network selection work
Draft -01 updates the problem definition based on discussions and external events
Jari Arkko & Bernard Aboba

4. Recent Developments IEEE 802.11 WIEN study group formed.
November 2004
Recent Developments
IEEE WIEN study group formed.
Liaison letter received from Chair, requesting review of network discovery documents.
Plan
Request feedback on problem selection document from
Update problem statement document to incorporate feedback.
EAP WG last call.
Jari Arkko & Bernard Aboba

5. November 2004
The Basic Problem
Jari Arkko & Bernard Aboba

6. There’s actually multiple problems
November 2004
There’s actually multiple problems
Access Network Discovery
Which access point to attach to?
Typically based on lower layer information.
Identifier Selection
Which identity and credentials to use for this AP?
An NAI issue which affects EAP.
Selection of roaming intermediaries
How to route the AAA conversation to the home network?
Payload Routing
How to route payload traffic in the right way
Filters and mandatory tunnels
Jari Arkko & Bernard Aboba

7. An alternative decomposition
November 2004
An alternative decomposition
Discovery
Access networks and access points
Home networks available through these
Mediating networks
Decision
Manual or automatic
Automatic is preferred
Most likely needs some pre-provisioned preference information
Indicating the selected network
Attach to the chosen network and access point
Provide the chosen identity and home domain
Possibly provide some hints about mediating networks
Jari Arkko & Bernard Aboba

8. Yet another alternative decomposition
November 2004
Yet another alternative decomposition
Type of information discovered
Access network identity
Roaming agreements
QoS
Cost
Service parameters
...
Jari Arkko & Bernard Aboba

9. November 2004
Some Earlier Findings...
All the problems are relevant, and new solutions are needed
The problems are very hard if you consider them with large number of networks, fast handoffs, security, and automatic decisions
The proliferation of multiple network selection technologies within IEEE 802, IETF, and 3GPP would be bad
Need to produce some early, simple solutions and wait for more full-blown schemes later
Jari Arkko & Bernard Aboba

10. November 2004
Issues
Jari Arkko & Bernard Aboba

11. Issue: Scope of Information
November 2004
Issue: Scope of Information
A larger amount of information may be necessary for (ideal) network selection:
Service parameters, middlebox existence
QoS, Cost …
EAP is an unlikely carrier for this information
What about the verification of this information vs channel bindings?
Proposal: just discuss the problem without talking about where the information is carried. Point out possible connection with channel bindings to verify the information.
Jari Arkko & Bernard Aboba

12. Issue: Relationship between mediating network and identifier selection
November 2004
Issue: Relationship between mediating network and identifier selection
Observation: both mediating networks and identifiers are represented in the same data item (NAI)
Would an EAP network discovery advertisement work rather as a general identity hint than mediating-network-only hint?
Hint: foo.com
Possible NAI to use:
Another possible NAI:
Proposal: Document this relationship
Jari Arkko & Bernard Aboba

13. Issue: Documenting Ongoing Work in Other SDOs
November 2004
Issue: Documenting Ongoing Work in Other SDOs
Need to add a more up-to-date description of what IEEE work exists in this area
Anything else?
Jari Arkko & Bernard Aboba