1. IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-10-0022-00-srho
Title: WiMAX-WiFi Interworking Discussion from
Date Submitted: January 13, 2009
Presented at IEEE session #36 in San Diego
Authors or Source(s):
 Subir Das (Telcordia)
Abstract: Understanding of and for discussion only
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2. IEEE 802.21 presentation release statements
This document has been prepared to assist the IEEE Working Group. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE
The contributor is familiar with IEEE patent policy, as stated in Section 6 of the IEEE-SA Standards Board bylaws < and in Understanding Patent Issues During IEEE Standards Development
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3. WiMAX – WiFi Network Ref. Model
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4. Interworking Functional Decomposition
Is this W3 or something else?
New
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5. Definitions WiMAX SFF WiFi SFF Reference Point Rx
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6. Definitions Reference Ry Reference Point W1 Reference Point W3
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7. SR WiMAX-WiFi Handover
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8. Call Flow Description
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9. Understanding of WiFi SFF?
Has a layer-3 interface towards WiMAX network and Layer-2 interface towards WiFi network ( this interface is TBD)
It does not have any AP fucntionality
Allows MS to establish an IP tunnel securely
Creates a L2 tunnel with WiFi AN authenticator securely
Receives IP packets from MS through the tunnel and then creates (NOT just forwards) L2 packets destined to WiFi authenticator, discovers the WiFi AN and routes them
Is this true?
If so, what is the source MAC address of this packet?
It is not clear from the description that to which MAC address STA sends the EAPOL-Start message?
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10. Understanding of WiFi SFF (contd)?
When WiFi SFF receives the packets from WiFi authenticator, does it change the source MAC address of the packet and then creates an IP packet destined to MS?
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11. Understanding of MS ?
MS WiFi interface Transmitter is off but Receiver is always on
MS knows
WiFi SFF IP address
Target AN’s BSSID
Target AP’s MAC address
MS does NOT know
WiFi authenticator MAC address (e.g.,thin AP model)
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12. Relevance to 802.21a Discussion?
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13. Proactive Pull Key Distribution (802.21a Discussion)1)
PoS-
MIA
MIH User for
MS Key Mng.
MIH User for MI
MSK’/rMSK’
auth L2 frames
MIHF ** 2)
Target MSA
MSK/rMSK
MAC
auth L2 frames
AAA*
*Different AAA servers may be used for different media
**Another alternative: MIHF directly receives/sends auth. L2 frames from/to the MAC
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14. Mapping to SR WiMAX- WiFi Interworking1)
Optional
MIH User for
MS Key Mng. (Optional)
MIH User for MI
WiFi SFF (with MIHF+)
MSK’/EMSK’ Ry W1
MIHF
auth L2 frames 2)
Target AN
MSK2/EMSK2
MAC
auth L2 frames
AAA
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