The role of MSC Server in LTE based network architecture

LTE is new technology for mobile telecommunications that take in consideration all architecture elements from current mobile networks. Every new technology is much better accepted if it offers interoperation with network elements that are currently used. Goal of this paper is to examine position of MSC Server in core networks after introducing of LTE system in already complex mobile networks. Starting point is that current mobile networks with MSC Server are using CS access and ISUP protocol for voice services, while LTE networks are pure PS networks and main protocol is SIP protocol. This paper will analyze requirements for MSC Server for interoperation with LTE and IMS systems. Also possibility of using voice services and SMS in LTE networks and continuity of voice session while changing access network will be analyzed.