Airvana CDMA Femtocell Manuel d'utilisateur télécharger pdf (Page 13)

an emergency call, an emergency service is dispatched to user’s current location as

soon as possible.

Whether the call is made from a mobile handset or a fixed-line phone, the call is directed

to a Public Safety Answering Point (PSAP) that handles the geographic region in which

the call was initiated. For a fixed-line call, in most cases, the street address of the fixed-

line phone is known, so an emergency dispatch (e.g. police) is sent immediately to that

address. When a call originates from a mobile phone, the location of the user is inmost

cases less certain. In North America, it has become mandatory for mobile phones to

support location identification for e911 calls, so they can report the user’s location to the

PSAP with a high degree of accuracy. Other countries are adopting similar

requirements for emergency calling from mobile devices.

To support emergency services, femtocells provide critical information to the mobile

operator core network, such as the location of the caller to identify the nearest PSAP

and a callback number to call the user in case of a disconnection. Femtocells support

emergency services even for those users who are not authorized to use the femtocell.

Summary

As shown above, femtocells are not simple standalone devices. They must be integrated

into the mobile operator’s network to enable seamless service and to ensure optimal

performance across both femtocell and macrocell networks. The architectures for the

UMTS and CDMA solutions have been defined by their respective standards bodies

(3GPP and 3GPP2). Both architectures enable a better experience, with service parity

for users, while ensuring security and scalable solutions for operators.

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Airvana CDMA Femtocell Manuel d'utilisateur Page 13