The purpose of the conference is to share ideas, experiences and informations among academic researchers, developers and service providers in the field of real-time systems and networks. RNTS'09 is the 17th edition of the conference formerly known as RTS (Real-Time Systems, Paris). The 12 first editions of RTS were french-speaking events held in Paris in conjunction with the RTS Embedded System exhibition. Since its 13th edition, the conference language of RTNS is english.(source: rtns09.ece.fr)