Abstract
Providing proper technical solutions to cover all requirements of the Voice over LTE (VoLTE) service is still a great challenge for operators. Network monitoring is one of the important methods to support service verification, deployment and operations. The VoLTE service utilizes both the LTE Evolved Packet Core (EPC), and the IP Multimedia Subsystem (IMS). These architectures are built on different principles, using protocols with different mindset. Furthermore, they utilize subscriber- and call-related parameters both in redundant and fragmented manners. On one hand, the same data is stored in functional elements of both architectures, which led to partial data redundancy. On the other hand, Call Data Records (CDRs) cannot be assembled by simply capturing signaling on a few given links. Information is fragmented, hence on-the-fly cross-correlation of key parameters is required. To effectively utilize the network and service monitoring system, operators need new methods to correlate the information of various interfaces and protocols. There are many obstacles to overcome here, including information fragmentation in various links, ciphered control messages, and global identifiers hidden by temporary ones.
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