The function of SRVCC, or Single Radio Voice Call Continuity, is to ensure that voice calls can seamlessly continue when a user moves between different network technologies, such as from LTE (4G) to 2G or 3G networks. SRVCC allows for the transfer of an ongoing voice call from an LTE network to a legacy circuit-switched network without dropping the call. This continuity is crucial for maintaining uninterrupted voice communication as users move through areas with varying network coverage.
What are the uses of SRVCC?
SRVCC is used primarily to maintain voice call continuity when a device transitions from an LTE network to a legacy 2G or 3G network. This is especially useful in areas where LTE coverage might be limited or unavailable, but 2G or 3G coverage is present. SRVCC ensures that voice calls do not drop when a user moves out of LTE coverage and into an area where only older network technologies are available. It helps in maintaining a consistent user experience and ensuring that ongoing calls are not interrupted during such transitions.
SRVCC in 5G refers to the continuation of voice calls as users move between 5G and 4G LTE networks. While SRVCC was initially designed for LTE and earlier generations, the principles of maintaining call continuity are extended to 5G networks. In a 5G context, SRVCC ensures that voice calls started on a 5G network can be handed over to an LTE network if 5G coverage is lost, thereby preserving the call without interruption.
The difference between SRVCC and eSRVCC (Enhanced SRVCC) lies in their capabilities and implementation. SRVCC provides basic voice call continuity between LTE and legacy networks. eSRVCC extends these capabilities by offering improved performance and handling more complex scenarios, such as better management of handovers and call quality during transitions. eSRVCC also aims to enhance the user experience by reducing call drop rates and ensuring smoother transitions between different network types.
The difference between SRVCC and iRAT (Inter-RAT) lies in their scope and functionality. SRVCC specifically addresses voice call continuity across different radio access technologies, such as from LTE to 2G or 3G. iRAT, on the other hand, is a broader concept that refers to the interworking between different Radio Access Technologies (RATs) for various types of data and signaling, not limited to voice calls. While SRVCC focuses on maintaining active voice call sessions, iRAT encompasses a wider range of network interactions and transitions.
