Transcript Slides S802.16m-10/0963

CMAC & Control Message
IEEE 802.16 Presentation Submission Template (Rev. 9.2)
Document Number:
IEEE S802.16m-10/0963]
Date Submitted: 12-08-2010
Source:
Anil Agiwal, Youngkyo Baek
Samsung Electronics
Voice:
E-mail: [email protected],
[email protected]
*<http://standards.ieee.org/faqs/affiliationFAQ.html>
Re:
“IEEE 802.16 Working Group Sponsor Ballot Recirc #1”, on P802.16m/D7
Base Contribution:
C80216m-10_0963
Purpose:
Discuss and adopt in D8
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Introduction
• MAC Control Message with CMAC protection
– CMAC Tuple is defined as an attribute in the control message
– MAC control message attributes are ASN.1 encoded
• Issues
– Receiver needs to perform ASN.1 decoding before verifying the
received control message
 To get CMAC tuple
 To get AK_COUNT (in case of AAI_RNG_REQ)
– ASN.1 encoded message is input to CMAC generation algorithm
 So CMAC tuple can not be part of ASN.1 encoded control
message
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Proposal (1/2)
• Remove CMAC tuple attribute from the control message
• Remove AK_COUNT from AAI_RNG_REQ
• CMAC tuple is added in the MAC PDU carrying control
message
– Define new extended header
 CMAC Info Extended Header – CIEH
– CIEH carries the CMAC tuple (Type(4), PMK_SN(4), CMAC_PN(24),
CMAC Value (64))
 CMAC-AK Info Extended Header – CAIEH
– CAIEH carries the CMAC tuple (Type(4), AK_COUNT (16), PMK_SN(4),
CMAC_PN(24), CMAC Value (64))
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Proposal (2/2)
• CIEH/CAIEH is added in the MAC PDU carrying
one of the following:
– Unfragmented control message protected by CMAC
– Last fragment of control message protected by CMAC
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Summary
• No impact on CMAC generation algorithm
• No impact on ASN.1 encoding of the control messages
• No impact on existing headers (AGMH, MCEH)
• New extended headers defined for cleaner design
– As CMAC tuple and AK_COUNT are not related to existing
extended headers
• ASN.1 decoding before CMAC verification is not required
– Even for AAI_RNG_REQ
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Proposed Text
• See contribution C80216m-10_0963
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