An Energy Efficiency Optimization Method for TTP Bus with Guaranteed Schedulability
ZHAO Tian-he;XIONG Hua-gang;CHENG Zi-jing;LI Qiao;Beihang University, School of Large Aircraft;Beihang University, School of Electronic Information Engineering;National Key Laboratory of Beijing Satellite Information Engineering Institute;
There is a certain amount of idle time in the Time Triggered Protocol( TTP) bus in practical applications of avionics interconnection. With the energy-saving "green avionics"concept penetrating into all aspects of the avionics system design,a message-scheduling table generation method is presented,in which energy efficiency is proposed as the optimization objective. On the premise of ensuring schedulability,the idle time resource is used to reduce the information symbol rate reasonably. By building a message allocation model of Static Packing( SP),the scheduling slack of the TDMA period of the TTP bus is optimized and allocated to each node to reduce the symbol rate of some of the packs,so as to save energy. A case of the message set is constructed in which messages belong to different nodes and have a variety of periods and length parameters. Case studies show that,compared with the conventional methods not using SP and frequency reduction optimization,this method can not only guarantee the schedulability of messages,but also effectively reduce the energy consumption in transmission.