Supporting Local Breakout in HRPD Femto

Peerapol Tinnakornsrisuphap (peerapol@qualcomm.com)Qualcomm

Doug Knisely (dknisely@airvana.com)Airvana

June 16th, 2008

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Goals

Main goals for HRPD Local Breakout• Allow AT to reach local server/printer at home

via HRPD Femto• Off-load traffic from wireless operator’s

backhaul when AT is on Femto• AT should still be able to access service on

wireless operator’s domain similar to when the AT is on macro basestations

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Femto Local Breakout Overview

• Red = Traffic Traversing Operator’s network– Goal : Allow ATs to be able access

services similar to when AT is on macro network

– Assumption : There is IPsec tunnel between Femto cell and the wireless operator’s network

• Blue = Local breakout to public Internet via Femto– Goal : Traffic can bypass home network

to save operator’s resources and improve latency

• Green = Local breakout to local CN– Goal : AT can communicate with servers

at home

HRPDFemto

AT

Operator’sNetwork

Correspondent Node(e.g., CNN.com)

DSLRouter(NAT)

Correspondent Node(e.g., local printer)

Correspondent Node(e.g., another AT)

PublicInternet

IPsectunnel

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Supporting HRPD Local Breakout

• AT uses AN-terminated stream for local breakout (blue and green) and PDSN-terminated stream only for operator’s service (red)

• Two IP interfaces and addresses are assigned to the AT

– Green and blue are on AN-terminated stream and are in one IP interface

– Red is on PDSN-terminated stream and is another IP interface (same with legacy)

– Each packet is routed on to an IP interface based either on application or routing policy

• Analogous to how VPN works

HRPDFemto

AT

Operator’sNetwork

Correspondent Node(e.g., CNN.com)

DSLRouter(NAT)

Correspondent Node(e.g., local printer)

Correspondent Node(e.g., another AT)

PublicInternet

IPsectunnel

IP interface 2AN stream

IP interface 1PDSN stream

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Recommendation

- Standardize method to support Local Breakout for HRPD Femto

- Allow HRPD Femto to assign IP address to AT on AN-PPP- Specify behavior of IP interface associated with AN-PPP regarding

initialization, handoff, IP address assignment

- Define mechanism to upload routing policy to AT- Define RADIUS parameter whether the user is authorized to

use local breakout