In this paper, by exploiting the unique characteristic of railroad wireless communication, a novel packet delivery delay reduction scheme for railroad wireless communication system using 3rd Generation Partnership Program (3GPP) Long Term Evolution (LTE) is proposed. In order to meet the requirements of LTE-R (LTE Railway) and provide high QoS level, it is very crucial to have very small packet delivery delay. By using the proposed scheme, almost zero service interruption time during handover

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... n be achieved Keywords: 3GPP LTE, Railroad Communication, Handover 2 B. Kim is the corresponding author. This paper proposes a packet delivery delay reduction scheme in railroad wireless communication system using LTE. By using the proposed scheme, almost zero service interruption time during handover can be achieved. Railroad Wireless Communication Using 3GPP LTE Railroad communication network has its unique network configuration since train moves along with fixed railroad. Railroad wireless communication network configuration using LTE is shown in Fig. 1 . A train which consists of multiple train cars moves along fixed train track. Since railroad communication network is a linear network and train's movement is pre-scheduled, communication of train passengers or crews can be easily managed. If such unique characteristics of railroad wireless communication network configuration are properly utilized, very efficient communication schemes can be designed. Railroad user communication is to provide railroad passengers with communication services. As shown in Fig 1, railroad users, LTE User Equipments (UEs) are able to communicate either directly with base station or indirectly via train communication devices such as WiFi Access Point (AP) and on-board terminal. LTE/LTE-Advanced (LTE-A) can be simply extended to be used for railroad communication. Such LTE system used for railroad is called LTE-R which is a next generation of GSM-R. The main benefit of using LTE-R is that various railroad related systems can be implemented using a single LTE-R network since LTE/LTE-A is a broadband wireless communication system providing high QoS level Internet Protocol (IP) data communication.