Airvana CDMA Femtocell Manuel d'utilisateur télécharger pdf (Page 9)

description that follows mirrors the use of this architecture in Airvana’s CDMA

femtocells.

The following figure shows the detailed diagram for the SIP/IMS femtocell network for

CDMA femtocells. As can be seen, the CDMA femtocell connects to a SIP/IMS core

network which in turn has a signaling connection to the legacy CDMA core network,

whose interfaces are defined in the TIA IS-41 standard. The SIP/IMS network is used

for the call control and media routing while the legacy core network is used to retrieve

subscriber data stored on the legacy network and to support handoffs to/from the

macrocell network, which exclusively uses the legacy core network.

Figure 4 : SIP/IMS Network Model

The main components in the SIP/IMS architecture are as follows:

• Femtocell Access Point with SIP/IMS Client

• SIP/IMS Core Network

• Femtocell Convergence Server (FCS)

The SIP/IMS core network can be a full-blown IMS network or it can be a basic SIP-

based VoIP network. An IMS core network would have the IMS nodes, such as the Call

Signaling Control Function (CSCF) nodes for call control, Home Subscriber System

(HSS) to manage subscriber data, and Media Gateway (MGW)/Media Gateway Control

Function (MGCF) nodes to connect to the Public Telephone Network (PSTN). In a

more basic SIP network, the functionality of the CSCF and MGCF functions may be

integrated into a SIP soft switch, and the HSS function may be handled by a Radius

server.

FCS is the key component in this architecture. It fits into an IMS core network as an

Application Server (AS) that connects to the CSCF’s using the standard ISC interface.

FCS connects to the legacy core network like an MSC using standard IS-41 network

interfaces.

1 2 3 4 5 6 7 8 9 10 11 12 13

Pas de commentaire

Airvana CDMA Femtocell Manuel d'utilisateur Page 9