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LTE: How does SIPTO works for lte network ?

+2 votes
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Can anyone please explain SIPTO functionality for lte network ?

posted Dec 27, 2013 by Harshita

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1 Answer

+1 vote

SIPTO is used to selectively offload the IP Traffic over internet by avoiding the mobile core network for the Data traffic.

Selected Internet IP Traffic Offload (SIPTO) enables routing of selected IP traffic through either the most optimal path in an operator’s core network or bypassing it completely. For example, an operator may decide to only offload best-effort services while still supporting VOIP calls over its core network.

Features:
Simultaneous support of SIPTO services and services via core network.
No user interaction or seamless offload
supports femto and macro network both
Mobility for offloaded sessions and service continuity between macro network and femto cells
Mobility in the case of roaming with agreement of operator

Advantages:
1. Low network congestion by offloading certain services
2. Low CAPEX and OPEX with fewer backhaul requirements, which are typically leased by most operators
3. Improved quality of experience for subscribers, hence improved consumer satisfaction, leading to better revenues

For more details please follow these Links:
http://tech.queryhome.com/26568/lte-what-lipa-sipto-pdp-context-pdn-connectivity-activation

http://tech.queryhome.com/26066/sipto-selected-internet-ip-traffic-offload-in-lte-network

http://tech.queryhome.com/26718/sipto-lipa-deployment-architecture

answer May 5, 2014 by Hiteshwar Thakur
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+1 vote

23.401 said that SIPTO above RAN uses TAI during the DNS interrogation. But I could't find the DNS interrogation using TAI in TS29.303. Could you show me the way or doc. for easy understanding?

TS 23.401
In order to select the appropriate PDN GW for SIPTO above RAN service, the PDN GW selection function uses the TAI (Tracking Area Identity), the serving eNodeB identifier, or TAI together with serving eNodeB identifier depending on the operator's deployment during the DNS interrogation as specified in TS 29.303 [61] to find the PDN GW identity.

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If a APN is SIPTO enabled, MME has to select the geographically closer GWs during GW selection and continue to do so during UE Mobility. My question is what are the parameters of DNS query and what is the actual syntax of that query ?

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