1. IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-06-0784-00-0000
Title: Clarification of MIH_LINK_SAP
Date Submitted: :November, 13, 2006
Presented at IEEE session #17 in November 2006
Authors or Source(s):
 Kentaro Ishizu, Yoshia Saito, Masahiro Kuroda, Ryoichi Komiya
Abstract: This document clarifies the definition of MIH_LINK_SAP which is currently ambiguous in the specification

2. IEEE 802.21 presentation release statements
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3. Motivation We need a clear definition for MIH_LINK_SAP
We propose to define MIH_LINK_SAP as a media-independent interface between MIHF and link-layer technologies
MIHF provides four types of media-independent SAPs; MIH_LINK_SAP, MIH_SAP, MIH_NMS_SAP and MIH_NET_SAP
MIH_LINK_SAP is a media-independent interface between MIHF and link-layer technologies such as IEEE 802.2, 802.3, , and 3GPP/2. Amendments of the link-layer technologies are suggested to have MIH_LINK_SAP

4. Misleading descriptions for MIH_LINK_SAP and proposed amendments
The MIHF … obtains services from the lower layers through a variety of technology dependent interfaces. (section 1.2)
(To be modified as) The MIHF … obtains services from the lower layers through a media independent interfaces
MIH_LINK_SAP: This represents the abstract media-dependent interface of MIHF with the lower layers of the protocol stacks. (section 5.5)
(To be modified as) MIH_LINK_SAP: This represents media independent interface of MIHF for the lower layers of the protocol stacks
This SAP defines the generic media independent link layer interface between MIHF and different link layer technologies. (section )
(To be modified as) This SAP defines the media independent link layer interface between MIHF and different link layer technologies
MIH_LINK_SAP should be media-independent

5. Where is the primitives mapping?
The primitives mapping is described in ;
“The key primitives defined as part of MIH_LINK_SAP are described in Table 16 and their mapping to specific link technology primitives are summarized in Table 17.”
Figure 12 in page 32 can be understood as if MIH_LINK_SAP had the mapping function

6. Proposed modification for Figure 12
The mapping function should be included in the figure 12
MIH Users
(L3 and above) CS ES IS
MIH_SAP
Media Independent Interface
MIH Function CS ES IS
MIH_LINK_SAP
The mapping function
Media Dependent Interface
MLME_SAP, CS_SAP,
3G_LINK_SAP, etc
802.2/
802.3
LLC
802.11
802.16
3GPP
3GPP2

7. Summary
We have proposed to define MIH_LINK_SAP as a media-independent interface between the MIHF and link-layer technologies
Modification to figure 12 has been proposed