Multiplexing mechanisms

CDMA is a form of direct-sequence spread-spectrum technology that allows many users to occupy the same time and frequency allocations in a given band/space. CDMA assigns each user a unique spreading code to spread the baseband data before transmission, in order to help differentiate signals from various users in the same spectrum.

• Larger capacity and coverage, keeping compatibility with 2G.

• Supports the flexibility required, with multiple parallel connections.

• Efficient packet access.

IMS - IP Multimedia Subsystem

IMS – Key Architectural Principals

Border Functions

• Access and Network Border Security.

• QoS and Admission Control.

• Media and Signaling Adaptation.

Core Functions

• Subscriber Management – Registration.

• Session Switching – Set-up and tear-down of session legs, Session state maintenance, Application Server invocation.

• Session Routing – Breakout to external networks.

• Centralized Provisioning – Subscriber and Routing data.

Application Functions

• Access to legacy applications.

• Native SIP Applications.

• Service Brokering.