IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-07-xxxx-00-0000 Title: For SB1 Comment #245 Date Submitted: September, 2007 Presented at IEEE 802.21 session #23 in Atlanta Authors or Source(s): Chan-Wah Ng Abstract: This contribution explains the comment #245 for Sponsor Ballot #1 and suggests resolution. 21-07-xxxx-00-0000

IEEE 802.21 presentation release statements This document has been prepared to assist the IEEE 802.21 Working Group. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.21. The contributor is familiar with IEEE patent policy, as stated in Section 6 of the IEEE-SA Standards Board bylaws <http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/faq.pdf>  IEEE 802.21 presentation release statements This document has been prepared to assist the IEEE 802.21 Working Group. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.21. The contributor is familiar with IEEE patent policy, as outlined in Section 6.3 of the IEEE-SA Standards Board Operations Manual <http://standards.ieee.org/guides/opman/sect6.html#6.3> and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/guide.html>  21-07-xxxx-00-0000

Mapping of MIH_Link_SAP Current draft defines MIH_Link_SAP as a SAP provided by the link layer technologies Given that most link layers (802.3, 802.11, etc) are already implemented: It is unlikely for implementers of link layers to provide such SAPs It is more likely that 802.21 implementer have to map native link layer SAPs to the MIH_Link_SAP Functionally, it is better to formalize this with a mapping function in the architecture 21-07-xxxx-00-0000

Suggested Architecture The general reference model in Fig. 4: Add this 21-07-xxxx-00-0000

Suggested Architecture The addition will affect all link layers specific reference models in Sect 5.5. For instance, Fig. 6 would be: Add this 21-07-xxxx-00-0000

Link SAP Mapping Function The proposed Link SAP Mapping Function: Is not within the scope of 802.21 It is merely defined as a formal approach for link layer implementers to map existing link layers SAP to the defined MIH_Link_SAP Example will be the work on the MAC State Convergence layer by 802.11u It also corresponds to the suggested mappings in Annex L 21-07-xxxx-00-0000

Error Code for MIH_Link_SAP Some MIH_Link_SAP cannot be easily mapped with existing link layer SAPs. Eg: Link_Going_Down in 802.16 Link_Event_Rollback in 802.16/3GPP/3GPP2 Possible resolutions: provide new error code in MIH_Link_SAP to indicate that the implemented Link SAP Mapping Function does not have a mapping for the requested MIH_Link_SAP provide a new MIH_Link_SAP for MIHF to query the Link SAP Mapping function the set of MIH_Link_SAP that are implemented 21-07-xxxx-00-0000