C.3 System acting as Home link in non-collocated case

24.3273GPPGeneral Packet Radio System (GPRS) and 3GPP I-WLAN aspectsMobility between 3GPP Wireless Local Area Network (WLAN) interworking (I-WLAN) and 3GPP systemsRelease 12Stage 3TS

When the GGSN (or PDG) and the HA function are not collocated, it is still possible to make a system act as home link. This is possible only if the HA and the system are sharing the UE binding information and the UE IP address pool.The interactions for the HNP allocation is an implementation issue, which is out of the scope of this TS. For example, this can be achieved by using static HNP assignment, or dynmamic HNP assignment using RADIUS or DHCP procedures.

If static IP address assignment is used, the UE’s HNP is statically configured in the HSS. The GGSN or PDG receives the static HNP from HSS or 3GPP AAA server during the authentication procedure, and assigns it to the UE.

If DHCP is used for dynamic HNP address assignment, the support of DHCPv6 prefix delegation option by the HA and the system acting as home link is required.

As an example for dynamic HNP allocation procedure at GGSN using RADIUS, the RADIUS procedure can be triggered by a pre-configured APN at GPRS attachment procedure. The GGSN can be configured to request and release a HNP for the given UE and given APN from an external server by using the Radius interface. The GGSN can receive the UE’s HNP from the RADIUS server during authentication of the UE. There are at least two deployment options for how to coordinate the UE’s HNP assignment between GGSN and the RADIUS server:

– One alternative is that the HA acts as a RADIUS proxy or server. In this case, based on the received IMSI and APN, the HA will retrieve the assigned HNP and return it back to the GGSN as part of the accept message.

– Another alternative is that there is an external RADIUS server to which the GGSN communicates with directly. The HA requests HNP of the UE from the same RADIUS external server at DSMIP bootstrapping procedures. The RADIUS external server needs to allocate the same HNP to the UE based on the IMSI and APN when the request is received from different network nodes.

Annex D (informative):
Change history

Change history

Date

TSG #

TSG Doc.

CR

Rev

Subject/Comment

Old

New

2008-05

Draft skeleton provided by Rapporteur

0.0.0

2008-05

CT1#53

Includes the following documents: C1-081970, C1-082002

0.0.0

0.1.0

2008-06

CT#40

Inclusion of the TS number (24.327) after CT approval of the WID

0.1.0

0.1.1

2008-07

CT1#54

Includes the following documents: C1-082647, C1-082648, C1-082649, C1-082650, C1-082651, C1-082652, C1-082653

0.1.1

0.2.0

2008-08

CT1#55

Includes the following documents: C1-083012, C1-083077, C1-083078, C1-083493, C1-083494, C1-083495, C1-083496

0.2.0

0.3.0

2008-09

Version 1.0.0 created for presentation to TSG CT#41 for information

0.3.0

1.0.0

2008-10

CT1#55bis

Includes the following documents: C1-084374, C1-084375, C1-084376, C1-084377, C1-084378, C1-084379

1.0.0

1.1.0

2008-11

CT1#56

Includes the following documents: C1-084696, C1-085073, C1-085323, C1-085325, C1-085361, C1-085362

1.1.0

1.2.0

2008-11

E-mail review

Editorial clean-up

1.2.0

1.2.1

2008-11

E-mail review

Editorial clean-up: change Annex A and B to Heading 8, and Annex A.x to Heading 1, and Annex A.x.y to Heading 2

1.2.1

1.2.2

2008-11

Version 2.0.0 created for presentation to TSG CT#42 for approval

1.2.2

2.0.0

2008-12

CT#42

Version 8.0.0 created after approval in CT#42

2.0.0

8.0.0

2009-01

LTE logo and keyword removed, GSM logo and keyword added

8.0.0

8.0.1

2009-03

CT#43

Typo in the title fixed and editorial cleanup

8.0.1

8.1.0

2009-03

CT#43

CP-090248

0001

4

Removing 3GPP Vendor Specific Mobility Option format

8.0.1

8.1.0

2009-03

CT#43

CP-090151

0002

Clarification on IPv4 Home Address assignment

8.0.1

8.1.0

2009-03

CT#43

CP-090151

0003

2

HA IP address(es) and HNP assignment through IKEv2 with PDG

8.0.1

8.1.0

2009-03

CT#43

CP-090151

0004

1

UE sends its Home Address, if available

8.0.1

8.1.0

2009-03

CT#43

CP-090151

0005

1

Editorial’s corrections

8.0.1

8.1.0

2009-03

CT#43

CP-090151

0008

1

Clarification on using Protocol Configuration Options

8.0.1

8.1.0

2009-06

CT#44

CP-090420

0010

1

Internet draft reference update

8.1.0

8.2.0

2009-09

CT#45

CP-090673

0012

1

I-WLAN Mobility

8.2.0

8.3.0

2009-09

CT#45

CP-090673

0014

DSMIPv6 reference update

8.2.0

8.3.0

2009-12

CT#46

CP-090914

0016

1

Static configured HNP usage

8.3.0

8.4.0

2009-12

CT#46

Upgrade to Rel-9

8.4.0

9.0.0

2010-03

CT#47

CP-100125

0019

Selection of an I-WLAN for IWLAN intersystem mobility

9.0.0

9.1.0

2010-03

CT#47

CP-100125

0023

Correction on IPSEC ESP profiles

9.0.0

9.1.0

2010-06

CT#48

CP-100347

0021

2

Sending HoA by the UE

9.1.0

9.2.0

2010-06

CT#48

CP-100347

0025

1

Usage of PDN prefix information with multiple PDNs to the same APN

9.1.0

9.2.0

2010-12

CT#50

CP-100739

0029

1

Correcting the Deployment cases, Annex C

9.2.0

10.0.0

2010-12

CT#50

CP-100754

0030

1

Attach to an additional system, General subclause

9.2.0

10.0.0

2010-12

CT#50

CP-100754

0031

1

Attach to an additional system, UE procedures

9.2.0

10.0.0

2010-12

CT#50

CP-100754

0032

1

Attach to an additional system, HA procedures

9.2.0

10.0.0

2010-12

CT#50

CP-100754

0033

1

Inter-system flow mobility

9.2.0

10.0.0

2010-12

CT#50

CP-100754

0034

1

UE-initiated removal of a system from a PDN connection, General subclause

9.2.0

10.0.0

2010-12

CT#50

CP-100754

0035

1

UE-initiated removal of a system from a PDN connection, UE procedures

9.2.0

10.0.0

2010-12

CT#50

CP-100754

0036

1

UE-initiated removal of a system from a PDN connection, HA procedures

9.2.0

10.0.0

2010-12

CT#50

CP-100754

0037

1

Network-initiated removal of a system from a PDN connection

9.2.0

10.0.0

2011-03

CT#51

CP-110185

0038

1

Network-initiated link removal procedure

10.0.0

10.1.0

2011-03

CT#51

CP-110185

0039

1

IFOM procedures for multiple foreign links scenario

10.0.0

10.1.0

2011-03

CT#51

CP-110185

0040

2

IFOM capability discovery for H1

10.0.0

10.1.0

2011-03

CT#51

CP-110185

0041

IFOM attach

10.0.0

10.1.0

2011-06

CT#52

CP-110464

0042

1

Clarification on ANDSF usage for I-WLAN mobility

10.1.0

10.2.0

2011-06

CT#52

CP-110478

0043

References to RFC

10.1.0

10.2.0

2012-03

CT#55

CP-120125

0045

1

IETF reference update

10.2.0

11.0.0

2014-09

CT#65

Upgrade to Rel-12

11.0.0

12.0.0