ABSTRACTNowadays, mobile applications are engaged with and dependedon the physical world more and more. Interaction with a certainproximity and thing is bringing smarter services into our dailylives through cyber-physical world collaboration. Pushnotification of meaningful content associated with the proximityor thing is one of key technologies of the cyber-physical services.For example, empty parking spot recommendation in a parking lotor promotion coupon notification of a shop at a shopping cent ershould be delivered accordingly. This paper explores reliable pushnotification of content for novel interactive mobile applicationsover Bluetooth Low Energy (BLE) beacon infrastructure. Sincemobile users move around with different speeds, this paper dealswith such difference to relay right content in a reliable manner,called Reliable Push Notification (RPN). RPN dynamicallyclusters contents and links them to a beacon to achieve reliability,and then adaptively pre-allocate contents for transmission.