1. 21-06-0xxx-00-0000 IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-06-xxxx-00-0000 Title: Information Service Flow Update Date Submitted: October 22, 2006 Presented at IEEE 802.21 session in Dallas Authors or Source(s): Jing Liu, Ting Yang, Yan Peng Abstract: This document clarifies the MIIS information flow and gives the detailed description about how to get these information elements over L2 transport.

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3. 21-06-0xxx-00-0000 Background The MIHF uses MIH_Get_Information primitive to get MIH information service. The corresponding message may be carried over appropriate transport(L2 or L3) and is delivered to the remote MIHF. Remote MIHF returns the necessary information to the MN via the appropriate response frame. It is important to note that before an MN is authenticated with the PoA, the MN should be able to obtain all the 802.21 related information elements available, if needed. In order to enable the information query before authentication, individual link technologies may provide an L2 or media specific transport or a protocol message exchange that makes this MIIS query exchange possible between the UE and a certain MIHF in the network.

4. 21-06-0xxx-00-0000 Problems Description In the current draft, the figure 23 (in 6.3.8) gives the MIIS information flow. It only describes the message (or primitives) between MIHF User/MIHF & MIHF/MIHF. There is no clear message exchange between MIHF and transport layer (L2 or L3). The messages (or primitives) between them need to be clarified, otherwise this protocol is difficult to be implemented and widely used.

5. 21-06-0xxx-00-0000 Suggested Remedy Modify figure 23 by adding a new procedure to show how to get Information Service over L2 transport.

6. 21-06-0xxx-00-0000 Media Specific Example In IEEE 802.16g, the MIH Control Primitives provide carriage of 802.21 MIHF Frames between the 802.16 entity and the NMCS. This enables the NMCS to map between MIHF frames and primitives on the 802.21 MIH-SAP. –The 802.16 entity may send or receive the MOB_MIH-MSG message to or from the peer 802.16 entity in order to convey MIHF Frames carrying the 802.21 MIH protocol messages. –The primitive C-MIH-NOTFY on the C-SAP is to indicate the reception of MOB_MIH_MSG on the air interface, or to request the 802.16 entity transmits a MOB_MIH-MSG message containing the 802.21 MIHF frame carried in the primitive.

7. 21-06-0xxx-00-0000 Media Specific Example – cont. In IEEE 802.16g, the MIH Control Primitives provide carriage of