YateUCN unified LTE/GSM core network can be used to extend an existing LTE network or to add LTE to a GSM or UMTS networks, with minimal changes to the existing network.
YateUCN implements all the components of the Evolved Packet Core in software: the MME (Mobility Management Entity), S-GW (Serving Gateway), P-GW (PDN Gateway), PCRF (Policy and Charging Rules Function), and PCEF (Policy and Charging Enforcement Function), creating a simplified, scalable architecture.
YateUCN connects to eNodeB over the standard S1 interface (S1AP and GTP-U), appearing to the eNodeB as an MME and S-GW.
YateUCN appears as a set of EPC components with the standard interfaces for the LTE network.
In GSM/UMTS, YateUCN appears as a MSC, VLR, SGSN and GGSN. This allows LTE eNodeBs to be easily integrated to the existing SS7-based core network. This approach also allows handover of VoLTE calls from LTE to GSM or UMTS without requiring updates to the existing SS7-based networks.
For roaming, YateUCN supports Diameter, SS7 MAP and CAMEL, allowing 4G LTE devices to connect to any HLR or HSS over either type of interface.
YateUCN is a Linux-based server running on commodity hardware, making the core network easy to install and manage.
To provide LTE access, operators need to build an LTE core – the EPC, and the IMS for voice over LTE.
The EPC is a complex architecture where different functions are performed by separate components – the MME, the S-GW, the P-GW, and the PCRF, increasing the overall costs for equipment and operation.
To ensure redundancy, each component needs to be backed by an additional one.
Handover from the LTE network to the CS one requires upgrades to existing 2G/3G deployments.
For roaming, as operators deploy 4G LTE networks, they need new interconnect agreements.