1. doc.: L2_Triggers_dj_r1 Submission January. 2004 David Johnston, IntelSlide 1 IEEE 802 Handoff ECSG L2 Triggers David Johnston david.johnston@ieee.org dj.johnston@intel.com

2. doc.: L2_Triggers_dj_r1 Submission January. 2004 David Johnston, IntelSlide 2 ‘Fast Handoff for Mobile IP and Link Layer Triggers’. Gang Wu & Alper Yegin. –Recommends Formal definition of 802 L2 triggers and associated APIs Align definitions between IETF and IEEE ‘Architectural Elements of an 802 Handoff Solution’, David Johnston –Recommends L2 Triggers Flexibility/Extensibility in trigger definition ‘draft-satish-l2-mobilereq-01.txt’, Satish Jamadagni –Ties L2 triggers to handover decision stages Background..

3. doc.: L2_Triggers_dj_r1 Submission January. 2004 David Johnston, IntelSlide 3 Link_up(which link) Link_down(which_link, why) Link_going_up(which link, when) Link_going_down(which link, when) Domain_crossing(old subnet, new subnet) Etc. Potential Trigger Types

4. doc.: L2_Triggers_dj_r1 Submission January. 2004 David Johnston, IntelSlide 4 Trigger Trajectories - Local MAC PHY LLC IPOther LLC Upper Layer attaches to LSAP of LLC May register interest in particular triggers from a trigger source Triggers may therefore have multiple destinations Triggers may originate from PHY, or MAC

5. doc.: L2_Triggers_dj_r1 Submission January. 2004 David Johnston, IntelSlide 5 Trigger Trajectories – Link Traversing MAC PHY LLC IPOther LLC Trigger sent down the stack to appear at remote end of link Requires a transport Security Implicationsb Applies to AP-STA, SS-BS situations Upper layer needs a reason to use these triggers Could originate from upper layer MAC PHY LLC IPOther

6. doc.: L2_Triggers_dj_r1 Submission January. 2004 David Johnston, IntelSlide 6 Triggers should have well defined semantics Implementations or standards defined behavior (e.g. in dot11 or dot16) map semantics of trigger to internal events E.G. –“Link_up” = Full MSDU transport established Trigger Semantics

7. doc.: L2_Triggers_dj_r1 Submission January. 2004 David Johnston, IntelSlide 7 MIBs –Wrong application, not station management, SNMP access not required, doesn’t fit with link traversing triggers Programmatic API? –Goes beyond the 802 spec implementation domain boundary Triggers look similar in type to incoming asynchronous data arrival –Causes indication upwards through MAC SAP –Are annotated events, not states –Recommend adding MAC SAP trigger primitives Upper layer trigger interface

8. doc.: L2_Triggers_dj_r1 Submission January. 2004 David Johnston, IntelSlide 8 Must support trigger registration –Register interest in a trigger –Declare supported trigger capabilities Still do through MAC SAP? Or use MIBs? –Link traversing triggers suggest MAC SAP approach Upper layer trigger interface

9. doc.: L2_Triggers_dj_r1 Submission January. 2004 David Johnston, IntelSlide 9 Generic: –Type –Remote, Local? –Source (UL, MAC, PHY) –Registered Recipients (LSAP id list) Specific –Reason Codes –Time Estimates –Other? Trigger Parameters

10. doc.: L2_Triggers_dj_r1 Submission January. 2004 David Johnston, IntelSlide 10 Triggers are pointless unless upper layer handover algorithms are deployed that understand them We should kickstart the process by drawing up strawman trigger specification –Trigger Semantics –MAC SAP Primitives Iterate and refine with trigger consuming bodies such as IETF Arrive at base trigger suite that will be used/useable Standardize them! IETF/3GPP/other