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Problem 2: The In-Car Radio Navigation Case Study

Problem 2: The In-Car Radio Navigation Case Study. Marcel Verhoef (Chess Information Technology, NL) Ernesto Wandeler, Lothar Thiele (ETH Z ü rich, CH) Paul Lieverse (Siemens VDO Automotive, NL). The In-Car Radio Navigation System. Car radio with built-in navigation system

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Problem 2: The In-Car Radio Navigation Case Study

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  1. Problem 2:The In-Car Radio NavigationCase Study Marcel Verhoef (Chess Information Technology, NL) Ernesto Wandeler, Lothar Thiele (ETH Zürich, CH) Paul Lieverse (Siemens VDO Automotive, NL)

  2. The In-Car Radio Navigation System • Car radio with built-in navigation system • User interface needs to be responsive • Traffic messages must be processed in a timely way • Several applications may execute concurrently

  3. 200 msec 50 msec System Overview – Change Volume User Interface Communication Navigation Radio Database

  4. Performance Requirements Input Data Rate Communication Resource Demand Computation Resource Demand Application A: Change Audio Volume

  5. 1000 msec System Overview – Handle TMC User Interface Communication Navigation Radio Database

  6. Application B: Handle TMC

  7. Application C : Address Lookup

  8. Proposed Architecture Alternatives 22 MIPS 22 MIPS 72 kbps 57 kbps MMI MMI (A) (B) 113 MIPS 11 MIPS 113 MIPS 11 MIPS 72 kbps NAV RAD NAV RAD (C) (D) (E) 72 kbps 72 kbps 260 MIPS 130 MIPS 260 MIPS 22 MIPS 113 MIPS RAD MMI NAV RAD MMI NAV MMI RAD NAV • kbps = kilo bit per second, mips = 106 instructions second • caveat: deploying app. B on arch. B needs an extra task to move data from rad to nav; assume 1000 instructions

  9. Task priorities & scheduling • Assume FP scheduling for all resources • Priorities are ordered as follows(ordered highest → lowest) • MMI.HandleKeyPress • Radio.AdjustVolume • Navigation.DatabaseLookup • MMI.UpdateScreen • Radio.HandleTMC • Navigation.DecodeTMC

  10. How do the proposed system architectures compare in respect to end-to-end delays? Analysis – Design Question 1 • consider the following application combinations • ChangeVolume and HandleTMC • AddressLookup and HandleTMC

  11. 22 MIPS MMI (A) 113 MIPS 11 MIPS 72 kbps NAV RAD How robust is architecture A? Where is the bottleneck of this architecture? Analysis – Design Question 2

  12. Architecture D is chosen for further investigation. How should the processors be dimensioned? Analysis – Design Question 3 (D) 72 kbps 130 MIPS 113 MIPS NAV RAD MMI

  13. Full details can be found at http://www.mpa.ethz.ch

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