As promised in our last LTE technology post, we want to tackle a new technology used in voice in 4G: Single Radio Voice Call Continuity. We’ll explain what SRVCC entails and give you an insight into our own approach towards this technology: inter-MSC SRVCC from 4G to 2G.
While most voice traffic in LTE is provided with CSFB, today the next stage involves using VoLTE and a technology called SRVCC for providing seamless voice continuity from LTE to other 2G/3G networks in areas not covered by LTE.
One of the main issues for LTE for operators is that deployment is spotty and incomplete. Once the big challenge of deploying VoLTE has been achieved, operators have to use SRVCC to offer subscribers continuous voice traffic when they reach an area without LTE coverage.
SRVCC allows for inter-Radio Access Technology handover, while also providing handover between a packet data-only network to a CS network. As the name suggests, SRVCC removes the need for two simultaneous active radios in devices, as required by CSFB, preserving the battery life, and manages to maintain continuous QoS during voice calls which are in progress. SRVCC is also a mandatory technology for maintaining continuity during emergency calls.
Typically, SRVCC enables voice and data handover from LTE to legacy networks and viceversa. To enable SRVCC, operators need to upgrade their legacy MSCs, the LTE RAN and EPC and the IMS network for VoLTE.
We have a different, simpler approach to offer operators: our YateUCN™ server handles SRVCC by performing and inter-MSC handover from 4G to 2G. Built to simultaneously be an MME/MSC and the IMS network for VoLTE, YateUCN performs SRVCC without the additional network upgrades (in LTE and 2G) mentioned above.
With YateUCN, the SRVCC handover will be performed as simple as an inter-MSC handover, without the additional investments normally required.
We are committed to innovation and believe in providing software-defined mobile network equipment, designed to cater to both 4G and 2G, while relieving operators from the huge costs of upgrade, maintenance and service. Our resilient and scalable YateUCN embodies this philosophy entirely.