Intel Confidential1

IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-10-0020-00-0000Title: SRHO between WiMAx<>3GPPDate Submitted: Jan, 2010Presented at IEEE 802.21 Session #36Authors or Source(s): Puneet Jain (Intel Corporation)Abstract: Single Radio Handovers b/w WiMAX and 3GPP

Intel Confidential22

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.

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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> 

Intel Confidential3

L3 Approach L3 mechanism using IWF (Inter-Working Function)

– UE communicates with IWF via X200/R9 interface (IP Tunnel)– The UE communicates with the 3GPP SFF over a mobile WiMAX IP access in order to

prepare handover to a 3GPP access. – The UE communicates with the WiMAX SFF over a 3GPP access

(GERAN/UTRAN/EUTRAN) in order to prepare handover to a mobile WiMAX access.

The IWF is composed of two independent logical elements – WiMAX SFF, 3GPP SFF

– For Handover from 3GPP to WiMAX: WiMAX SFF emulates an BS. The WiMAX SFF interfaces with ASN using WiMAX R6 interface.

– For Handover from WiMAX to 3GPP SFF emulates a RNC/eNB (RRC functionality)– 3GPP SFF exposes a X201 interface to target SGSN (GERAN/UTRAN HO) or X202 interface to

target MME (E-UTRAN HO). – X201 is like RNC - SGSN interface (Iu), X202 is like eNB – MME interface (S1-MME)

3GPP SFF

WiMAX SFF

X200

R9

X202

X201

R6

IWF

To UE

To ASN-GW

To SGSN/MME

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L3 Architecture for Single Radio HO from 3GPP to WiMAX

SGi

PCRF

Gx

HSS

Operator’s IP Services e.g. (IMS,

PSS, etc.),. ,

SWx

S6b

Rx

PDN- GW

AAAS2a

STa

Gxc

S5

S6a

S-GW

Gxa

ASNASN GW

BSBS

GERAN

UTRAN

MME

SGSN

UE

R6

S3

E-UTRAN

S1-MME

LTE-Uu

WiMAX-SFFR9

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L3 Architecture for Single Radio HO from WiMAX to Rel8 3GPP

SGi

PCRF

Gx

HSS

Operator’s IP Services (e.g. IMS,

PSS etc).

SWx

S6b

Rx

P-GW

3GPPAAAS2a

STa

Gxc

S5

S 6 a

S-GW

Gxa

ASN

ASN GW

BSBS

3GPP- SFF

GERAN

UTRAN

GERAN

UTRAN

MME

SGSN(Rel8)

UE

S3

X200

X201

E-UTRAN

S1-MME

X202

R1

WiMAXProxySTa+

S11

S1-U

S4

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L3 Architecture for Single Radio HO from WiMAX to Pre-Rel8 3GPP

SGSN PRIF

HLR/HSS

GGSN

BS

BS

ASN- GW

UE/MS

3GPP PS Core Network

WiMAX ASN

IuPS/Gb

Gn

Gr

Gr’/Wx

Gi

Gc

R3R1

R6

R6

WiMAX Interface

3GPP Interface

HA/LMAAAA

PCRF

WiMAX Home CSN

R3+RAN

3GPPSFF

X200

X201

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SFF Discovery via DNS query– MS acquires the domain name via DHCP and generates the FQDN.

The MS sends a DNS query to the DNS Server including the FQDN. The DNS server responds with a DNS answer including the SFF’s IP address.

FQDN is generated as below – WiMAX-BSID.WiMAX.SFF.<domain name>

SFF Discovery

MS/ATSourceSystem

LocalDHCP AAA

3. DNS Query

4. DNS Answer (SFFs IP address)

1. Domain Name acquisition via DHCP

SFFTargetSystemDNS

2. Generate FQDN for SFF discovery

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WiMAX to Rel8 UTRAN/GERAN Handover

3GPPSFF

Mobile WiMAXAccess

UE HSSSGSN(Rel-8) PDN-GWS-GW

6. Attach Request

8. Location Update &Subscriber Data Retrieval

PCRFUTRAN/GERAN

7. Access Authentication7. Access Authentication

9. Attach Accept

11. Activate PDP Context Request12. Create Session

Req 13. Create Session Request

16. Create Session Resp

15. Create Session Response

18. Activate PDP Context Accept

5. RRC Connection Establishment

6

7

9

4. Decision to pre-register and HO to GERAN/UTRAN

1. WiMAX radio on

2. IWF discovery & security establishment

3. UE - 3GPP SFF Tunnel

14. PCEF Initiated IP-CAN Session Modification Procedure

17. Establishment of Radio Access Bearers

HO to GERAN/UTRAN

19. WiMAX Resource Release

10. RRC Connection Establishment

Intel Confidential9

WiMAX to Pre-Rel8 UTRAN/GERAN Handover

4. 3GPP Pre-Rel8 Attach/Authentication

6. PDP Context Activation (APN)

7. AAA Request (IMSI)

8. AAA Request (NAI)

9. AAA Response (HA@, MN-HA key, MN-HA SPI)

10. MIP RRQ(NAI, HoA=0, FACoA, MN-HA AE)

11. AAA Request (NAI, SPI)

12. AAA Response (NAI, MN-HA key)

13. MIP RRP(HoA)

15. AAA Access Accept (HoA)

MS 3GPP Pre-Rel8 Core NW3GPP Pre-Rel8 IWK

Function AAA HA

Data traffic through 3GPP Pre-Rel8 network

HLR

14. MIP Tunnel

16. PDP Context Activated (HoA)

3GPPSFF

1. WiMAX radio on

2. IWF discovery & security establishment

3. UE - 3GPP SFF Tunnel

5. UE decides to HO to pre-rel8 3GPP Access

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WiMAX to E-UTRAN Handover

TargeteNB

MME S- GW

3GPPSFF P- GW

2. Decision to pre-register to E- UTRAN

7. Create Session Request (HI)

3. Attach Request

1. WiMAX Radio on

HSS PCRF

21. RRC RB establishment 20. S1 Initial UE context setup Request

19. RRC connection request / Service request

UE

5. Authentication

6. Location update and Subscriber data retrieval

8. Create Session request

10. Create Session response (and Create Bearer Request)

18. E-UTRAN radio ON

22. S1 Initial UE context setup Complete 23 . Modify bearer Request (HI)

26 . Modify bearer Response

5. Authentication

5. Authentication

4. Attach Request (UE Capabilities), TAI)

12. Attach Accept, (and Bearer Setup Request))

13. Attach Accept, (and Bearer Setup Request))

14. Attach Complete, (and Bearer Setup Response) 15. Attach Complete, (and Bearer Setup Response)

11. Create Session Response (and Create Bearer Request)

17 . Create Bearer Response

16 . Create Bearer Response

27 . P-GW initiates resource allocation deactivation procedure at WiMAX access

9. PCEF Initiated IP- CAN Session Modification Procedure

24. Modify Bearer request

25. Modify Bearer Response

Intel Confidential11

EPS Attach Type

EPS Attach Type is present in Attach Request. Reserved bit can be used to indicate “Pre-Attachment with 3GPP

SFF” MME on receiving “Pre-Attachment with 3GPP SFF” SHALL set the

Handover Indication (HI) in create session request towards the S-GW.

Bit 4 of octet 1 is spare and shall be coded as zero.

All other values are unused and shall be interpreted as "EPS attach", if received by the network.

reserved111

reserved011

combined EPS/IMSI attach010

EPS attach100

123

Bits

EPS attach type value (octet 1)

Bit 4 of octet 1 is spare and shall be coded as zero.

All other values are unused and shall be interpreted as "EPS attach", if received by the network.

reserved111

reserved011

combined EPS/IMSI attach010

EPS attach100

123

Bits

EPS attach type value (octet 1)