IEEE 802.21 MEDIA INDEPENDENT HANDOVER
DCN: 21-10-0114-00-srho
Title: Comments and Questions for Optimized Single Radio
Handover Procedures of WMF
Date Submitted: May 20, 2010
Presented at IEEE 802.21
Authors or Source(s):
Yoon-Young An, Junghoon Jee, Hongseok Jeon, Changmin Park (ETRI)
Abstract: Comments and Questions for Optimized Single Radio
Handover Procedures of WMF
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Optimized Single Radio Handover
Key Features
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Pre-Registration over L3 tunnel
• E.g., WiMAX SFF (Signaling Forwarding Function) performs target BS (Base
Station) operations while the MS is located in non-WiMAX Access network
• MAC messages transfer over L3 tunnel
• Pre-registration toward target WiMAX network
IP Core Network
Data
ASN-GW
WiMAX
SFF
AR
Pre-registration
through L3 tunnel
Serving AP
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BS
(Target)
BS
(Another Candidate)
4
Review of Detailed Procedures
- WiMAX IWK case
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Overall Steps
MS
IP Core
Network
WiMAX
SFF
BS
ASN-GW
AAA
HA
DNS
Phase 1: SR Target Network Detection and SFF Discovery Phase
Phase 2: SR Handover Session Pre-Pregistration Phase
Phase 3: SR Handover Action Phase
(Pseudo ActiveàActive or Pseudo ActiveàPseudo IdleàActive )
Phase 4. SR Handover Resource Revocation Phase
Note: Figure from DCN 21-10-0068-00-0000 and clarification is marked as blue
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Phase-1: SR Target Network Detection
and WiMAX SFF Discovery
Source
System
MS/AT
Local
DHCP
DNS
SFF
Information
Server
AAA
802.21 Information Service Query and Response
1. Domain Name acquisition via DHCP
2. Generate FQDN
for SFF discovery
3. DNS Query
4. DNS Answer (SFFs IP address)
Note: Figure from DCN 21-10-0068-00-0000 and
the Information Service query is added by referencing DCN 21-10-0005-00-0000
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Comments for Phase 1
• Complete network discovery phase is not specified in 3G IWK
document
• SFF Discovery
• + Information of available access networks, Information
about interworking and roaming aspects
• The DHCP and DNS procedures for “SFF IP address
discovery” are not required in case where Information Server
provides SFF IP address to MS through
MIH_Information_Response as per DCN 21-10-0005-00-0000
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Phase-2: SR Handover Session
Pre-Registration (1)
• Assumption : ASN-GW for WiMAX SFF  Pre-registered ASN-GW
MN
WiFi
WiMAX
AP
IP Core
Network
WiMAX
SFF
Target
BS/ASN-GW
Pre-registered
ASN-GW
HA
AAA
Data
IKEv2 procedure to setup a secure tunnel
Phase2
secure tunnel
WIMAX SFF
starts to perform
BS operation
DCD/UCD & BSID
1. Initial Network
Entry Procedure
(stage3 4.5.1.1)
MS-to-Network
EAP authentication
Process
+
MS 802.16e
registration
MS-to-Network EAP authentication process
REG_REQ
MS_Attachment_Req
MS_Attachment_Rsp
REG_RSP
MS_Attachment_Ack
Connections Establishment
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Data Path Establishment
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Phase-2: SR Handover Session
Pre-Registration (2)
• Assumption
• Pre-registered ASN-GW includes Authenticator
• Apply ASN Anchored Mobility (WiMAX stage3 4.7 ASN Anchored Mobility)
MN
WiFi
2. Active mode HO
Preparation
Procedure
WiMAX
AP
IP Core
Network
WiMAX
SFF
Pre-registered
ASN-GW
Target
BS/ASN-GW
HA
AAA
MOB_MSHO_Req
HO_Req
HO_Req
• Successful HO
Preparation
Phase (stage3
4.7.2.1.2)
Context retrieve
DP Pre-Reg.
HO_Rsp
HO_Rsp
MOB_MSHO_Rsp
HO_Ack
HO_Ack
• Successful HO
Action Phase
(stage3 4.7.2.2.2)
MOB_MSHO_Ind
HO_Cnf
HO_Cnf
HO_Ack
HO_Ack
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Phase-3: SR Handover Action
MN
WiFi
WiMAX
AP
WiMAX
SFF
IP Core
Network
Target
BS/ASN-GW
Pre-registered
ASN-GW
HA
AAA
Network ReEntry
DP Pre-Reg.
• Successful HO
Action Phase
(stage3 4.7.2.2.2)
PBU
PBA
CMAC Key
Count Update
HO_Complete
HO_Complete
HO_Ack
HO_Ack
Data Path Deregistration
Data
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Clarifying Questions for Phase 2 and 3
• Which steps are included for “Pre-Registration”?
• 1) Initial Network Entry
• 2) Initial Network Entry
+ HO Procedures (up to MOB_HO-IND)
• ASN-GW clarification in the figure of Slide #6?
• 1) Pre-registered ASN-GW?
• 2) Anchor ASN-GW?
• 3) Target ASN-GW (for Target BS)?
• 4) ASN-GW of WiMAX SFF?
• Which entity manages the pre-registered contexts?
• 1) SFF or
• 2) ASN-GW
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