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IEEE 802.21 MEDIA INDEPENDENT HANDOVER

DCN: 21-10-0xxx-00-srho

Title: Overview of Single Radio Handover Procedures of WMF

Date Submitted: July 15, 2010

Presented at IEEE 802.21

Authors or Source(s):Yoon-Young An, Junghoon Jee, Hongseok Jeon, Changmin Park, Byungjun Ahn

(ETRI)

Abstract: Review the Single Radio Handover Procedures in WMF

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IEEE 802.21 presentation release statementsThis document has been prepared to assist the IEEE 802.21 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 802.21.

The contributor is familiar with IEEE patent policy, as outlined in Section 6.3 of the IEEE-SA Standards Board Operations Manual <http://standards.ieee.org/guides/opman/sect6.html#6.3> and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/guide.html> 

IEEE 802.21 presentation release statementsThis document has been prepared to assist the IEEE 802.21 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 802.21.

The contributor is familiar with IEEE patent policy, as stated in Section 6 of the IEEE-SA Standards Board bylaws <http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/faq.pdf> 

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WiMAX SR Interworking Architecture

• WiMAX interworking architecture supports inter-technology handover from non-WiMAX networks (3GPP, 3GPP2, WiFI) to WiMAX

• Tightly coupled architecture

• Similar architecture adopted by 3GPP2 for WiMAX to HRPD handover

WiMAX ASN Non-WiMAX IP Access

IP Services

R9

WiMAXSFF

IP Core N/W

BS

BS

R6 ASN-GW

R6

MS/UE

R6

Note: Slide from DCN 21-10-0068-00-0000Note: Slide from DCN 21-10-0068-00-0000

3

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Overall Steps

MS WiMAXSFF

BS ASN-GW AAA HAIP CoreNetwork

Phase 2: SR Handover Session Pre-Pregistration Phase

Phase 3: SR Handover Action Phase ( Active Handover or Idle-to-Active )

Phase 4. SR Handover Resource Revocation Phase

Phase 1: SR Target Network Detection and WiMAX SFF Discovery Phase

DNS

Note: Slide from DCN 21-10-0068-00-0000Note: Slide from DCN 21-10-0068-00-0000

4

+ HO Preparation

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Overall SRHO Procedure

BS(Target)

Serving AP

WiMAX Access Network

AR/MAG

BS(Another Candidate)

WiMAX SFF

HA/LMA

ASN-GW (MAG)

MS

Peer-MSMIH Information

Server

Phase 2-2

Phase 1 SFF DiscoveryPhase 2.1 Pre-registration

Phase 2.2 HO Preparation Phase 3 HO Action

WiFi Access Network

IP Core Network

R6

R6

R6

Data

Phase1

Phase2-1

R9

Phase 3

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Phase-1: SR Target Network Detection and WiMAX SFF Discovery

MS/ATSourceSystem

LocalDHCP

AAA

3. DNS Query

4. DNS Answer (SFFs IP address)

1. Domain Name acquisition via DHCP

SFFInformation

ServerDNS

2. Generate FQDN for SFF discovery

802.21 Information Service Query and Response

Note: Figure from DCN 21-10-0068-00-0000 and Note: Figure from DCN 21-10-0068-00-0000 and the Information Service query is added by referencing DCN 21-10-0005-00-0000the Information Service query is added by referencing DCN 21-10-0005-00-0000

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Assumption for Phase 2&3

• In case of SRHO from WiFi to WiMAX networks

• Pre-registered ASN-GW includes Authenticator

• Target ASN-GW is different from the pre-registered ASN

• WiMAX forum applied ASN anchored mobility to single radio inter-RAT HO procedures

• Inter-RAT HO needs IP mobility(MIP, PMIP).

• CSN anchored mobility has IP mobility function.

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IKEv2 procedure to setup a secure tunnel

Phase-2: SR HO Session Pre-Registration

1. Initial Network Entry Procedure (stage3 4.5.1.1)

Data

DCD/UCD & BSID

Connections Establishment

MS-to-Network EAP authentication process

WiMAXSFF

MS

WiMAX

Target ASN-GW (MAG)

LMA/HA AAA

AP/AR (MAG

)WiFi

Pre-registered ASN-

GW(MAG) /Authenticator

Target BS

secure tunnel

Data Path Establishment

MS 802.16e Registration process

WIMAX SFF starts to perform BS operation

RA(with HNP)

IP Address Configuration for WiMAX Interface

IP CoreNetwork

AAA query with MS ID

AAA reply with profile(HNP)

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Phase-2: SRHO Preparation

2. Active mode HO Preparation Procedure

• MS-Initiated

SRHO Preparation

(Refer stage3 4.7.2.1.2)

• Refer stage3 4.7.2.2.2

OR

MOB_MSHO_IndHO_Cnf

HO_Cnf

HO_Ack

MS

WiMAXWiFiWiMAX

SFF

Target ASN-GW

(MAG) LMA AAA

Pre-registered ASN-

GW(MAG) /Authenticator

Target BS

Data

HO_AckThis message initiates a handover to one of the target BSs

AP/AR (MAG

)

IP CoreNetwork

MOB_MSHO_Req

HO_Req

HO_Req

This message have target BS’s information

Context retrieveDP Pre-Reg

HO_Rsp

HO_Rsp

HO_Req

HO_Req

MOB_BSHO_RspHO_Ack

HO_Ack

Context retrieveDP Pre-Reg

HO_Rsp

HO_Rsp

HO_Ack

HO_Ack

MOB_BSHO_Req

This message includes one or more potential target BS’s • Network-

Initiated SRHO Preparation

(Refer stage3 4.7.2.1.5)

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Phase-3: SR Handover Action

Network ReEntry

PBU

PBA

Data

• Successful HO Action Phase

MN

WiMAXWiFiWiMAX

SFF

Target ASN-GW (MAG) LMA AAATarget

BS

Pre-registered ASN-

GW(MAG) /Authenticator

Anchor_DPF_HO_Trigger

Anchor_DPF_HO_Req

Anchor_DPF_Relocate_Req

Anchor_DPF_Relocate_Rsp

Access-Request/MAR

Access-Accept/MAA

Anchor_DPF_HO_Rsp

Anchor_DPF_Relocate_Ack

Context_Rpt(Anchor ASN GW ID)

Context_Ack

AP/AR (MAG)

HO Latency in SRHO

Bi-Dir tunnel

IPv6 sessionContinuation

IP CoreNetwork

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Key Issues

• Need SRHO optimization to minimize the packet loss and HO latency

• How to support the Untrusted WiFi network in SRHO• Different Operator’s Network : No SLA(Service Level

Agreement)• Public WiFi Network• Private AP established at Home

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