LTE-R 기반의 국내표준 열차제어시스템(KRTCS) …

1 2014 KSR2014S034. LTE-R (KRTCS) . Plan Study to transmit data between Onboard and Wayside based on LTE-R at Korean Radio based Train Control System of national standards * , *, *, *, *. Yun Bae Kim* , Sang Won Seo*, Hong Lip Kim*, Kwang Hee Kim*, Yong Seon Lee*. Abstract The Korean Radio based Train Control System under Korea Railroad Research Institute, a National R&D Program, is progressed to transmits data based on WiFi in planning phase. The New generation Wireless Communication System Development with KRTCS was decided to the wireless communication system based on LTE at April, 2012.

2 So, there is need to interface between LTE-R and KRTCS. Although LTE-R system completed to support both voice and video at 2013, these days, it is needed to interface between LTE-R and KRTCS. The train control data needs to give priority to transmit data. This study is for that the PCRF(Policy Charging & Rule Function) is adopted to support this function and the test plan is interfaced between KRTCS and LTE-R instead of existing WiFi. And this study is for that it is considered for the commercialization for the future through the case study to solve the suggested issue at this time.

3 Keywords : LTE-R , KRTCS, Korean Radio-Based Train Control System, PCRF. KRTCS (Korean Radio based Train Control System) WiFi . , 2012 4 LTE .. LTE-R . 2013 KRTCS .. PCRF (Policy Charging & Rule Function). WiFi LTE .. : LTE-R , KRTCS, , PCRF. 1.. : * . , LTE(Long term evolution) . LTE-R . LTE-R - , .. KRTCS WiFi - . , LTE-R .. , KRTCS . , LTE-R . PCRF (Policy Charging & Rule Function) .. LTE-R .. 2.. KRTCS .. IP , . (Internet Protocol Application) . IP . IP , .. IP IP .. KRTCS . 1:n , (Subscriber) .. KRTCS 3 , .. (Internet Group Management Protocol, IGMP) - .. IGMP .. IGMP Host.

4 Multicast Host IGMP .. Host . (Join) Membership Report .. KTCS , . IP .. LTE-R . LTE-R . LTE-R 3 GPP Release 8 User Plane . LTE-R . (User Datagram Protocol, UDP) .. UDP . , .. LTE Protocol Stack . LTE- R User Plane IP Unicast .. KRTCS LTE-R . (Virtual Private network, VPN) . LTE-R KRTCS .. Fig. 1 LTE Protocol Stack(UE Side). VPN . VPN .. VPN VPN .. , .. KRTCS . 3 GRE IPsec VPN - .. GRE , KRTCS .. GRE GRE . GRE IPsec GRE . IPsec . Fig. 2 GRE IPsec GRE IPsec . GRE IPsec . , . , GRE IPsec . KRTCS LTE-R . VPN KRTCS LTE-R . ATP/ATO (Automatic Train Control, ATS), . (Automatic Train Protection, ATP) LTE-R .

5 VPN . Fig. 3 Structure to transmit data between on-board and wayside to use VPN based on LTE-R . ATP ATP IP. Join , ATS ATO IP . Join . Join .. Join ATP ATP . Wireshark . Fig. 4 The wayside Result by multicast Fig. 5 The onboard Result by multicast LTE-R PCRF . LTE-R (Subscription profile) .. LTE-R . APN(Acess Point Nme) EPS(Evolved Packet System) . EPS / .. (Policy and Charging Control) , PCC PCRF(Policy Charging & Rule Function) . LTE-R APN , , . , PCRF ARP 1 . PCC P-GW . KRTCS . UDP .. 1:1 , 1:n .. Packet . , .. , Join .. 3.. KRTCS 3 .. LTE-R - . GRE IPsec VPN.

6 , LTE-R APN PCRF QoS . PCC P-GW .. LTE-R PCRF QoS .. " " .. [1] 3 GPP TS , Policy and Charging Control over Gx Reference Point . [2] 3 GPP , Policy and Charging Control Architecture . [3] 3 GPP TS , Telecommunication Management; Charging Management; Charging Architecture and Principles . [4] VPN, , pp. 98-147.