Dual Radio Voice Call Continuity (DRVCC) is a telecommunication technology designed to ensure seamless voice call continuity when a user moves between different radio access networks (RANs), such as from LTE (4G) to 3G or 2G networks, and vice versa.
Key Components of DRVCC:
- Circuit-Switched Fallback (CSFB):
- Function: Transfers a voice call from an LTE network to a 3G or 2G network when the user moves out of LTE coverage.
- Process: The call, initially set up using the IP Multimedia Subsystem (IMS) core network, is handed over to the circuit-switched network of the 3G or 2G system.
- Single Radio Voice Call Continuity (SRVCC):
- Function: Ensures uninterrupted voice calls when moving between LTE and other networks (3G or 2G).
- Process: The IMS core network manages the handover, maintaining the call without interruption.
Benefits of DRVCC:
- Seamless Voice Services: Prevents call drops during network transitions, enhancing user experience.
- Improved Network Coverage: Allows access to voice services in areas with limited LTE coverage by switching to 3G or 2G networks.
- Reduced Network Congestion: Balances the load by transferring calls between different networks.
DRVCC is particularly important for maintaining high-quality voice services as users move through areas with varying network coverage. It exemplifies the advancements in mobile communication technology aimed at providing a consistent and reliable user experience.