5 November 2007 1

Overview of Proposed Femtocell Architecture Alternatives presented at the 3GPP2 Femto

Workshop

Airvana

5 November 2007

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5 November 2007 2

Femtocell Architecture Alternatives

• 1x Circuit Services

• 1x and HRPD Packet Data Services

5 November 2007 3

1x Circuit Service Architecture Alternatives

• Legacy-based Architecture– Security Gateway (FNG)– Femtocell generates A1/A2p– A1/A2p interface terminates on MSCe, which interfaces to the ANSI-41

core network• SIP/IMS-based Architecture

– Security Gateway (FNG)– Femtocell generates SIP/IMS; talks to IMS core network– Convergence Server (CSRV) acts as gateway between SIP/IMS and

legacy circuit (ANSI-41) core networks• SIP-based Architecture with Call Manager Gateway

– Security Gateway (FNG)– Femtocell generates SIP; talks to Call Manager– Call Manager acts as gateway from SIP to legacy A1/A2 circuit– Circuit services provided by MSC via A1/A2 interfaces

5 November 2007 4

Typical Femto Architectures for Legacy Circuit Services (Legacy Technology-based Approach)

FemtocellPublic

Internet

LegacyCircuit

Network

FemtoNetworkGateway

LegacyController

(e.g., MSCe)

Legacy Circuit Protocols

(e.g., ANSI-41)

HLR

MSCLegacy

Controller Protocols

Tunneled in IP (e.g., A1/A2p)

Device Requesting

Legacy Circuit Service (e.g.,

1x Voice)

Mux/DemuxProxy

5 November 2007 5

Typical Femto Architectures for Legacy Circuit Services (SIP/IMS-based Approach)

FemtocellPublic

Internet

LegacyCircuit

Network

FemtoNetworkGateway

ConvergenceServer(CSRV)

Legacy Circuit Protocols

(e.g., ANSI-41)

HLR

MSC

SIP

Device Requesting

Legacy Circuit Service (e.g.,

1x Voice)

Operator’sSIP/IMS Network

SIP

MGWRTP

5 November 2007 6

Typical Femto Architectures for SIP-based Architecture with Call Manager Gateway

FemtocellPublic

Internet

LegacyCircuit

Network

FemtoNetworkGateway

CallManager

A1/A2

HLR

MSC

SIP

Device Requesting

Legacy Circuit Service (e.g.,

1x Voice)

5 November 2007 7

1x and HRPD Packet Data Architecture Alternatives

• PCF + PDSN– Security Gateway (FNG)– PCF Concentrator– Use existing A10/A11 to PDSN from each

Femtocell

• PDST + FNG– Security Gateway (FNG)– Current PDSN functions divided between

Femtocell and FNG

5 November 2007 8

PCF + PDSN Architecture

EV-DO

EV-DO Phone

1x Phone

1xRTT

SeGW

PCF Concentrator

IP CoreNetwork

HA

IPSec Tunnel(s)

(M-)IP

PDSN

PPP/A10/A11

PPP/A10/A11/IPSec

PPP/A10/A11

5 November 2007 9

PDST + FNG Architecture

EV-DO

EV-DO Phone

1x Phone

1xRTT

Femto NetworkGateway (FNG)

IP CoreNetwork

HA

IPSec Tunnel(s) (M-)IP