1. Some use cases and requirements for handover Information Services Greg Daley MIPSHOP Session IETF 64

2. Information Services over IP Link-layer and network information Part of IEEE 802.21 Handover Services IS server may not be adjacent link-layer entity. Allow deployment of IS transported over IP draft-faccin-mih-infoserv-01.txt – G. Daley, S. Faccin, Q. Xie, E. Hepworth. Some Requirements for a Handover Information Service

3. Information Services Over IP One of the handover services Mobility Service 1 Information Service Mobility Service 2 Mobility Services Delivery Protocol IP Mobility Service Signaling Layer Mobility Service Trans/Appl Layer

4. Handover Information Services A platform for exchanging physically or topologically local information Assistance of handover planning Optimize channel and base station selection Dependent on quality of information exchanged Explicitly requires management(!)

5. Handover Information Services IS Query Mobile Server IS AP Movement AP

6. Information Services Characteristics Non-real time Informational flows (not controls or events) Primarily request/response – Push possible – Events separate.

7. Scope of work Needs to be discussed with 802.21 – Different roles to be negotiated. Seems to be three tasks (at least) Server/Service Discovery Security Transport – Transport Layer Services – Network Layer requirements

8. Information Service Message Exchanges Mobile IS Client IS Server 1) IS Server Discovery 2) IS Server Address 3) Contact Server 4) SA Bootstrap 5) IS Query 6) IS Response Directory or Group Three Phases: Discovery, SA Bootstrap, Request/Response

9. Information Service Scenarios IS Server on Link-layer peer May not need IP

10. Information Service Scenarios IS Server on same IP hop Perhaps on router

11. Information Service Scenarios IS Server on same IP hop Remote Device beyond IP hop Needed? (802.21?)

12. Information Service Scenarios Information sourced from different locations Different IS Servers for different roles

13. Requirements (Guesses): 1 You’ve already read these in the draft. Really relies on firm requirements from 802.21 Some interesting ones: – Provide information service transport mechanism which works of IPv4 and IPv6 – Allow multiple packet responses – Robust query/response on wireless networks – Distinguish between packet source and query source (allow proxies) – Provide NAT traversal for IPv4 (off-link?)

14. Requirements (Guesses): 2 – Describe IS discovery mechanisms for IPv6 – Describe IS discovery mechanisms for IPv4 – Provide common discovery (even if server is AP, Router or off-link?) – Protect discovery mechanism? Alternatively, rely on SA bootstrap – Allow distinct classes of Information Services to be discovered – Allow multiple servers to be discovered

15. Requirements (Guesses): 3 – Common SA negotiation regardless of server location – Provide confidentiality for queries and responses – Provide identity protection against eavesdroppers for querier – Protect IS Server and discovery resources from DoS.

16. Transport Issues Response Timing Constraints Stream or Datagram Oriented Reliability in Transport or above

17. Discovery Issues Single or multiple discovery methods Information Server participation in discovery IS Servers’ own use of discovery – Recursive discovery of Information Services? Only one server, or one server per class

18. Security Issues Mutual authentication requirements IS-Server to IS-Server SA requirements Rate limitation of queries Session or host-based SAs

19. Thankyou

20. EXTRA SLIDES

21. Handover Services All being developed in IEEE 802.21 Event services –Link-layer indications –e.g. link-layer availability for data service Command Services –Control of network state by remote devices –e.g. instruction to change channel near tunnel Information Services –Information for planning handovers (continued…)