IETF #65 Network Discovery and Selection Problem draft-ietf-eap-netsel-problem-04 Farooq Bari Jouni Korhonen

Issues addressed from EAP WG mailing list during the WGLC Comments by Jari, Bernand & Alper Requested updates to Abstract, Section 1, 2, 3, 4 – Done –Includes cutting off a lot text of ’in progress’ work Add Terminology – Done Update References - Done Editorials – Done Latest -04 rev not put out yet

Terminology Network (Realm?) Selection This refers to selection of the operator/ISP in order to access the network. The process of network selection can occur either at the beginning of a new session or during a handoff in case the user is mobile. The selection is dependent upon for example the authentication credentials for the user / device and the roaming agreements. Network Selection can in turn also depend upon Access Technology Selection and/or Domain Selection. Access Technology Selection This refers to the selection between access technologies e.g , UMTS, WiMAX. The selection will be dependent upon for example the support for an access technology by the device and availability of such access technology based networks. Domain (Bearer?) Selection For some access technologies (e.g. UMTS), there can be a possibility for delivery of a service (e.g. voice) by using either a circuit switched or a packet switched bearer. The Domain selection refers to selecting one of the bearer type for service delivery. The decision can be based on support of the bearer type by the device and the network as well as user subscription and operator preferences.

Terminology issues Currently ’Network’ has several interpretations in the draft (sometimes refers to a realm, identity, prefix, physical network etc) – to be fixed What is the right term for use in this draft - “Realm” or “Network” ? Do they have a well defined/consistent meaning across the industry and standards forums? RFC4284 talks about identity selection hints..

Other issues The draft still has some related discussions in problem definition section. If the draft is a general problem statement, should these discussions be moved to the respective forums under existing work section?

Design issues 1/2 – Old design constraints Section Contains material from old sections 4 & 5 and will have four topic AAA Issues –Network selection may leverage or interact with the AAA infrastructure & be compatible with all (current) AAA protocols. –The solution should not prevent the introduction of new AAA or access network features…. Backwards compatibility –The solution should allow interoperability with clients, protocols, access networks, AAA proxies, and AAA servers that have not been modified to support network discovery and selection….

Design issues 2/2 – Old design constraints Section Efficiency constraints –The solution should be efficient in network resource utilization, specially on bandwidth constrained sections of the network (E.g. wireless link) & the solution should not significantly impact network attachment time... etc Network discovery and selection decision making –"Phone-book" based approaches such as RFC 3017 appear attractive due to their ability to provide sufficient information for automatic selection decisions. However, there is no experience on applying such approaches to wireless access…

Questions?