As the mobile Internet has become widespread in recent years, communication based on mobile networks is increasing. As a result, security threats have been posed with regard to the abnormal traffic of mobile networks, but mobile security has been handled with focus on threats posed by mobile malicious codes, and researches on security threats to the mobile network itself have not attracted much attention. In this paper, we analyzes security threats that occurred to mobile networks recently, and checks the security threats likely to occur in actual commercial service networks and their results. We propose a countermeasure that can respond to such security threats, present results that can be applied to actual commercial networks, and thus make it possible to proactively respond to security threats described in this paper.

Abstract-In recent years, global cellular network service is being changed rapidly to LTE. However, the fast introduction of LTE has been going with not enough research about security threat so it could have many kinds of vulnerability. Therefore, the research about security threat on 4G network is ongoing in many countries. Particularly, in the situation where domestic subscribers are increasing rapidly, the security threats which are hindering stability and usability could make a fatal effect on many users. 4G network should consider the feature of mobile network to keep 4G network stable. Because mobile network has limited radio resources, it releases the radio resource which is not used in selected time and reallocates when requesting the data transmission. Many signaling messages are transferred in the network entities to allocate or release the radio resource. In this paper, it will introduce the technology to detect signaling DoS traffic hindering the stability and usability of network entities managing the radio resources by huge signaling message from the repetitive wireless connection/release message.Index Terms-Denial of service, LTE, signaling DoS, virtual setup, 4G.