1. IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-05-0369-00-0000
Title: Update of Packet Header Format
Date Submitted: September, 14th , 2005
Presented at IEEE session #10 in Orange Country
Authors or Source(s):
  Wolfgang Gröting, Kalyan Koora, Stefan Berg
Abstract: Issues with present MIH General Packet Format proposals to solve them.

2. IEEE 802.21 presentation release statements
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3. Present MIH General Packet Format*
Fields envisaged here
* The same applies for the MIIS Packet Format

4. Proposal to change the present MIH Packet Format
Use fixed header instead of variable header to avoid scheduling problems
Locate variable MIH Func. Destination/Source Identifier before MIH Message data
Change MIH Function Identifier Length from 4 octets to 1 octet
Unusual that MIH Function ID Length value > 255
Examples: MAC address = 6, IPv4 = 4, IPv6 = 16
Change Transaction ID from 1 octet to 4 octets
Transactions IDs do have a value greater than 255
Examples: IP - packet ID = 2 bytes; TCP - sequence no. = 4 bytes

5. New MIH General Packet Format
Fixed 1 2
Variable
Interchange Transaction ID and MIH Function ID Length positions
Provides enough space for the respective identifiers
Interchange MIH Function Identifiers with MIH Message ID
Leads to fixed message header and variable payload
 No impact on the existing functionality