SIPTO for eHRPD
China Telecom
Biao Long: longb@gsta.com
HUAWEI
Jixing Liu: liujixing@huawei.com
Alcatel Lucent
Mike Dolan: Mike.Dolan@alcatel-lucent.com
ZTE
Rajesh Bhalla: rabhalla@zteusa.com
23 May
2011
www.huawei.com
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Motivation

Introduce the SIPTO (Selected IP Traffic Offload) feature to eHRPD for
R10 alignment.
slide 2
Background


The SIPTO function enables an operator to offload certain types of
traffic at a network node close to that UE's point of attachment to the
access network.
Offload of traffic for a UE is available for E-UTRAN (TS 23.401)
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slide 3
In order to select a set of appropriate GW (S-GW and P-GW) based on
geographical/topological proximity to UE, the GW selection function specified in
TS 29.303 [61] uses the UE's current location information.
It is the responsibility of the new MME to decide whether to perform
deactivation with reactivation request for a given PDN connection for SIPTO
purposes.
Realization for SIPTO relies on the same architecture models and principles as
for local breakout.
In order for the operator to allow/prohibit SIPTO on per user and per APN basis,
subscription data in the HSS is configured to indicate to the MME if offload is
allowed or prohibited.
If HSS indicates VPLMN address not allowed, then VPLMN (i.e. MME) shall not
provide SIPTO.
The target MME may wish to redirect a PDN connection towards a different GW
that is more appropriate for the UE's current location.
SIPTO for eHRPD

HSGW can obtain subscription data in the HSS via Sta/Pi* if offload is allowed or prohibited.

HSGW can decide whether to perform deactivation with reactivation request for a given PDN
connection for SIPTO purposes.

If HSS indicates VPLMN address not allowed, then HSGW shall not provide SIPTO.

The HSGW may wish to redirect a PDN connection towards a different GW that is more
appropriate for the UE's current location.

The HSGW may be configured on a per APN basis as to whether or not to use SIPTO. If the
SIPTO allowed/prohibited information from the HSS conflicts with HSGW local configuration,
then SIPTO is not used.
slide 4
Recommendation

Discuss and Adopt for X.P0057 –B in principle.
slide 5
Appendix-Trusted non-3GPP Access
Authentication and Authorization Answer
slide 6