Unified EPC/IMS core network

Unified EPC/IMS core network

RK Telesystem offers unified core network solution that is intended for new LTE networks, for upgrading GSM/GPRS networks to LTE or for extending existing LTE networks.The unified software-defined core implements all the functions and protocols of the LTE core network in software, and uses commodity hardware. It integrates the EPC layers – MME, S-GW, P-GW, PCRF, and PCEF.It also includes the IMS layers for VoLTE – P-CSCF, I/S-CSCF, IWF, and BGW.It communicates with the ENB (LTE eNodeB module) over S1AP and GTP protocols and uses a JSON API for configuration and management.

Unified GSM/GPRS core network

The unified core network implements the functions and protocols of GSM/GPRS core networks.In GSM/GPRS, the it acts as a MSC/VLR/SGSN/GGSN/GMSC in a single server. It connects to the BTS (GSM module) over GTP and SIP, replacing the costly SS7 MAP-A interface (BSSAP protocol). This leads to a higher return on investment without affecting the reliability of the network or the provided services.

The unified core network solution is based on replacing the eNodeB with the ENB (LTE) and the base station subsystem with the BTS (GSM).

Remote access for operations and management

The unified core network is easy to operate and manage remotely using the Mobile Management Interface (MMI) online.The interface makes it accessible to add a new core unit, to setup a cluster of core networks, to configure a single unified core network function (MSC/VLR, GMSC, SGSN, GGSN, SGW or PGW), to configure unified core network equipment with all its GSM/GPRS/LTE functions and more. With MMI operators can remotely manage their entire network equipment using a single web interface.

Features and benefits

  • Runs on commodity hardware, allowing for a simplified network architecture and lower deployment costs.
  • Enables carriers to deploy LTE networks with reduced initial investment.
  • Allows for scaling as you go. You can add more servers or separate the functionality as more users adopt your service.
  • Increases network resiliency; in case of equipment failure you can easily configure another server to take up the functions of the fault node.
  • The SIP protocol establishes connection between the UCN and the BTS, allowing the base station to communicate with any UCN in the network. A Base Station Controller (BSC) is not needed between the BTS and the UCN.
  • Has low idle traffic, which allows transport technologies like satellite.

Software specifications

SS7 connectivity– SIGTRAN, SCTP with CRC checksum
– M2UA, M2PA, M3UA
– ITU MAP v3
– CAMEL phase 2
Voice interconnect– SIP and RTP
– ISUP using external MGCP gateway
– E.214 (ITU) translation table
– E.164
– Supported operations:
– MSC <-> AuC messages (authentication)
– MSC <-> EIR messages (equipment identification, optional)
– VLR <-> HLR messages (location management, roaming)
– MSC <-> SMSC messages (SMS)
– S1AP r11
– GTP v1, GTP v2
– Supported operations:
– SGSN <-> AuC messages (authentication)
– SGSN <-> EIR messages (equipment identification, optional)
– SGSN <-> HLR messages (data mobility management, roaming)
– SGSN <-> GGSN messages (data session)
– ENB <-> SGSN messages (LTE control and user data)
– BTS <-> SGSN messages (GPRS control and user data)
SIP– Supported standards (RFC3261)
– Registrar function
– B2BUA for calls
– RTP (RFC3550) with sideband DTMF (RFC2833)
– SMS and USSD over IP
SMS– Format: SMS PDU (MO and MT)
– MAP/SS7 transport (T-PDU format)
– SIP MESSAGE transport (SMS over IP, R-PDU format)
CDR– File format
– Rotation interval
– File transfer: FTP
Interfaces– C Interface (MAP, HLR <-> GMSC)
– D Interface (MAP, HLR <-> VLR)
– E Interface (MAP, MSC <-> MSC)
– F Interface (MAP, MSC <-> EIR)
– G Interface (MAP, VLR <-> VLR)
– SIP, RTP (YateBTS <-> VLR)
– S1 Interface (S1AP & GTP, YateENB <-> EPC)
– Gi Interface (IP, connects to Public Data Network)
– Gn/Gp Interface (GTP, SGSN and GGSN)
– Gr Interface (MAP, SGSN <-> HSS)
– Gc Interface (GTP or SS7/MAP, interface to HLR) (optional)
CODECS and transcoders– G.711a, G.711u
– GSM-FR 06.10
– iSAC
– iLBC
Operating systemLinux based

Hardware specifications


Dell PowerEdge R4303.5″ Chassis with up to 4 Cabled Hard Drives
ProcessorIntel Xeon E5-2630 v3 2.4GHz,20M
Memory8GB RDIMM, 2133MT/s, Dual Rank, x8 Data
Hard drives1TB 7.2K RPM SATA 6Gbps 3.5in Cabled Hard
Hard drive configurationRAID 1 for H330/H730/H730P (2 HDDs) with Cabled Chassis
Internal controllerDVD ROM SATA Internal for 4HD Chassis ReadyRails Sliding Rails With Cable
Power supply550W
Network adapterIntel Ethernet I350 DP 1Gb Server Adapter, Low Profile

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