1. Introduction to “Tap – Dance ”

2. Company Proprietary Presentation Topics  Introduction  Handover scenarios  Inter-Network Handover consequences  Common Market solution  Mobile IP mechanism  Centralized mobility server method  Tap-Dance basics  Tap-Dance – experimental results  Tap-Dance advantages  Summary

3. Company Proprietary Introduction  Wireless IP-connectivity is becoming a major concern of the research, academic and industrial community, due to a growing deployment base of wireless and mobile networks.  The recently ratified IEEE 802.11f Inter Access Point Protocol (IAPP) provides STAs with constant IP-connectivity when roaming between neighboring Access Points (APs) inside an Extended Service Set (ESS) of their Home Network (HN).  Nevertheless, it does not support inter-network handover (IP handover) resulting in limited mobility range of wireless STAs.  ATMEL presents a simple new mechanism for the provision of inter- network handover support in IEEE 802.11 WLANs, so as to extend the functionality of the current IAPP and assure the functionality of delay sensitive & real time applications. This adds IP Mobility in 802.11 WLANs.

4. Company Proprietary Handover Scenarios - Active link - Broken link Intra Network movement home network  Inside the home network routing is supported by traditional IP routing mechanisms.

5. Company Proprietary - Active link - Broken link Intra Network Movement Intra Network movement IP does not change.  During an Intra-Network movement the IP location of the STA’s point of attachment does not change. Handover Scenarios

6. Company Proprietary - Active link - Broken link Handover Scenarios Intra Network movement  Any STA’s active session gets disconnected.  The Inter Access Point Protocol takes place to restore the IP connectivity.

7. Company Proprietary - Active link - Broken link Handover Scenarios Inter- Network movement  Occurs when an STA moves towards an ESS of a different IP subnet.

8. Company Proprietary BSS-C - Active link - Broken link Inter- Network Movement Handover Scenarios Inter- Network movement  The roaming STA re-associates to a foreign AP outside its home network.

9. Company Proprietary BSS-C - Active link - Broken link Handover Scenarios Inter- Network movement  The roaming STA re-associates to a foreign AP outside its home network.

10. Company Proprietary BSS-C - Active link - Broken link Inter- Network Movement Inter-Network Handover consequences PACKETS Destined to the STA’s IP

11. Company Proprietary BSS-C - Active link - Broken link Inter Network Movement Inter-Network Handover consequences PACKETS Get to the foreign AR Reach the Home AP Destined to the STA’s IP

12. Company Proprietary BSS-C - Active link - Broken link Inter Network Movement Inter-Network Handover consequences PACKETS Get to the foreign AR Reach the Home AP GET DROPPED Destined to the STA’s IP

13. Company Proprietary BSS-C - Active link - Broken link Inter Network Movement Inter-Network Handover consequences PACKETS Sourced at the STA’s foreign location Get to the foreign AR

14. Company Proprietary BSS-C - Active link - Broken link Inter Network Movement Inter-Network Handover consequences PACKETS Sourced at the STA’s foreign location Get to the foreign AR

15. Company Proprietary BSS-C - Active link - Broken link Inter Network Movement Inter-Network Handover consequences PACKETS Sourced at the STA’s foreign location Get to the foreign AR GET DROPPED

16. Company Proprietary BSS-C - Active link - Broken link Inter Network Movement Inter-Network Handover consequences PACKETS Sourced at the STA’s foreign location Get to the foreign AR Reach the Home AP GET DROPPED Destined to the STA’s IP

17. Company Proprietary Inter-Network Handover consequences PACKETS Sourced at the STA’s foreign location Get to the foreign AR Reach the Home AP GET DROPPED Destined to the STA’s IP get disconnected The STA’s ongoing sessions get disconnected and it is not reachable by its home IP address

18. Company Proprietary Inter-Network Handover consequences  Need for an IP Mobility Solution  Fast and reliable IP handoff for delay-sensitive & real-time applications

19. Company Proprietary  Most of the solutions are based on the Mobile IP (Mobile Internet Protocol)  A mechanism developed for the network layer to support mobility  Functions at the network layer to manage changes in IP addressing  Independent of underlying transmission technology Common Market Solution Link Network Transport Session Technology dependent Application &Technology independent Technology dependent SIP TCP Mobile IP GSM

20. Company Proprietary Mobile IP routers are needed Deferent protocol for L3 mobility management Delay is introduced before the actual handover Wireless & Wireline signaling during IP HO establishment Mobile IP routers are needed Different protocol for L3 mobility management Delay is introduced during the Agent Discovery phase Wireless & Wireline signaling during IP HO establishment Mobile IP Mechanism Mobile IP is not suitable for real time and delay sensitive applications! Additional capital investment Additional complexity and network load Significant contribution to the overall HO Delay Increase the amount of Packet loss and Delay

21. Company Proprietary Are there any enhancements to the classical Mobile IP?

22. Company Proprietary Yes, Either by improving MIP handoff latency or by Optimizing MIP routing Are there any enhancements to the classical Mobile IP?

23. Company Proprietary …But they are all based on a pre or post registration methods. Are there any enhancements to the classical Mobile IP?

24. Company Proprietary …These are not applicable in 802.11 systems.

25. Company Proprietary Router Mobility server STA Each STA is assigned a constant virtual IP address by the Mobility server on the wired network. Server Centralized mobility server method

26. Company Proprietary Router Mobility server STA Each STA is assigned a constant virtual IP address by the Mobility server on the wired network. The Mobility server manages network traffic on behalf of the client, intercepting packets destined for the client’s virtual address and forwarding them to the client’s current POP(point of presence) address. Server Centralized mobility server method Require additional server and SW

27. Company Proprietary ATMEL’s “TAP-DANCE” is a new protocol built on top of the Inter- Access Point Protocol (802.11f) to allow freedom of user movement in the enterprise and public spaces (patent pending) “Tap-Dance” Atmel’s solution to the IP Mobility Problem

28. Company Proprietary Mobile IP routers are needed Different protocol for L3 mobility management Delay is introduced before the actual handover Wireless & Wireline signaling during IP HO establishment Additional capital investment Additional complexity and network load Significant contribution to the overall HO Delay Increase the amount of Packet loss and Delay Tap-Dance Advantages Mobile IP

29. Company Proprietary Mobile IP routers are needed Different protocol for L3 mobility management Delay is introduced before the actual handover Wireless & Wireline signaling during IP HO establishment Additional capital investment Additional complexity and network load Significant contribution to the overall HO Delay Increase the amount of Packet loss and Delay Tap-Dance Advantages No additional capital investment is needed Runs on the existing infrastructure Tap-Dance Insignificant addition to the network load Extension to the existing IAPP No Agent Discovery phase and no delay IP roaming is transparent to the mobile STA Very short HO delay & nearly zero packet loss Zero Wireless signaling during IP HO establishment Mobile IP

30. Company Proprietary Tap-Dance Advantages No additional capital investment is needed Insignificant addition to the network load No Agent Discovery phase and no delay Very short HO delay & nearly zero packet loss Runs on the existing infrastructure Extension to the existing IAPP IP roaming is transparent to the mobile STA Zero Wireless signaling during IP HO establishment Tap-Dance

31. Company Proprietary No additional capital investment is needed Insignificant addition to the network load No Agent Discovery phase and no delay Very short HO delay & nearly zero packet loss Runs on the existing infrastructure Extension to the existing IAPP IP roaming is transparent to the mobile STA Zero Wireless signaling during IP HO establishment “Tap-Dance” Enables complete freedom of movement! complete freedom of movement! Tap Dance Tap Dance Advantages

32. Company Proprietary Tap-Dance – Experimental results Number of tests vs. Total IP Handover Latency

33. Company Proprietary Tap-Dance – Experimental results Number of packets lost vs. Data Rate  All tests were performed under normal (real) networking conditions  Variation in handover latency values & non-stable packet loss are due to the Ethernet LAN and WLAN backbone traffic

34. Company Proprietary Let’s summarize  802.11f (IAPP) uses L2 Mobility Management to allow Stations to roam between APs inside their Home IP Network  For VoIP and Public Access applications L3 Handover is required for maintaining continuous connectivity (service) while moving across different network segments  Atmel has developed a new protocol called “Tap-Dance” which together with IAPP allows freedom of user movement in the enterprise and public spaces (patent pending)  Tap-Dance is able to support variety of 802.11 clients’ products (e.g. VoIP phones)  Tap-Dance will run on the AT76C511 and future ATMEL’s products

35. Company Proprietary Inexpensive – No need for additional equipment. Simple – Adds insignificant network load Excellent performance - Very low latency Reliable - Almost Zero packet loss Tap-Dance Let’s summarize

36. Company Proprietary The better way to offer unlimited IP Mobility to 802.11 wireless clients Tap-Dance Let’s summarize