1. 21-12-0058- MuGM IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-12-0141-00-MuGM Title: Definition of IEEE 802.21d multicast identifiers Date Submitted: November, 2012 Authors or Source(s): Daniel Corujo (ITAv), Antonio de la Oliva (UC3M) Abstract: This document describes the use of a subset of the MIHF_ID space to describe multicast identifiers.

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3. Multicast MIHF Identifiers Each MIHF has a unique MIHF_ID, which is also used in transactions to indicate the source/destination of a MIH Protocol message Currently, a zero-length MIHF_ID is able to be used as a broadcast identifier However, this is now enough to individually address different multicast groups Moreover, any change to the MIHF_IDs needs to be backwards compatible

4. Multicast MIHF Identifiers Proposal: to use MIHF identifiers as the means for identifying MIH-enabled multicast groups – We can create multicast MIHF_IDs by using the NAI representation of a L2 or L3 multicast address Features: – Allows a node to have several multicast-enabled MIHF_IDs, in addition to it’s own unique unicast MIHF_ID – Relies on already-existing multicast procedures at both L2 and L3 level Thus maintains the already existing MIHF_ID determination capability – This MIHF_ID is still a NAI-encoded IP address (for L3) or a NAI- encoded link-layer address (for L2) – Enables the use of.21 messages without further modification