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Impact of IEEE 1609.4 Channel Switching on VSC Performance in the Control Channel

Impact of IEEE 1609.4 Channel Switching on VSC Performance in the Control Channel. Daniel Jiang and Qi Chen Mercedes-Benz Research & Development North America, Inc. Palo Alto, CA FEB 4 th , 2009. Purpose of This Study.

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Impact of IEEE 1609.4 Channel Switching on VSC Performance in the Control Channel

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  1. Impact of IEEE 1609.4 Channel Switching onVSC Performance in the Control Channel Daniel Jiang and Qi Chen Mercedes-Benz Research & Development North America, Inc. Palo Alto, CA FEB 4th, 2009

  2. Purpose of This Study • To compare common vehicle safety communication broadcast performances in a number of scenarios, with and without IEEE 1609.4 channel switching applied • Three modes of operations • No Channel Switching: base line usage of 100% of the CCH for safety messaging • Straight Application of 1609.4: naïve usage of channel switching (i.e., the applications are unaware of channel switching and keep generating messages without regarding CCH intervals) • Optimized Scheduling with 1609.4: vertically integrated design so that no messages are generated during SCH and guard intervals

  3. TXC RXC IEEE 1609.4 Channel Switching Emulation in NS-2 • A new module, CHSW, is created to signal both the MAC and PHY of the start and end of CCH intervals • PHY • added TX.abort and RX.abort • RX: added a state of CHSW, no successful reception in this mode • TX: added a state of CHSW, no transmission if the transmission will end before CCH.end • Channel State Manager in MAC • CCH.start generates a PHY.busyIndication • CCH.end generates a PHY.idleIndication BK CH CHSW TX RX PHY PM

  4. Simulation Matrix Frame reception rate vs. distance with 200 and 400 m transmission ranges and no interference

  5. Message Reception Rate (200m Range, 75Byte Payload) 3 Hz 5 Hz 10 Hz

  6. Message Reception Rate (400m Range, 150Byte Payload) 3 Hz 5 Hz 10 Hz

  7. Message Reception Rate (400m Range, 300Byte Payload) 3 Hz 5 Hz 10 Hz

  8. Inter-Message Gap (400m Range, 150Byte Payload, 3Hz) No Switching Optimized Switching

  9. Inter-Message Gap (400m Range, 150Byte Payload, 5Hz) No Switching Optimized Switching

  10. Inter-Message Gap (400m Range, 150Byte Payload, 10Hz) No Switching Optimized Switching

  11. Discussion

  12. Inter-Message Gap (400m Range, 150Byte Payload, 3Hz) No Switching Naïve Switching Optimized Switching

  13. Inter-Message Gap (400m Range, 150Byte Payload, 5Hz) No Switching Naïve Switching Optimized Switching

  14. Inter-Message Gap (400m Range, 150Byte Payload, 10Hz) No Switching Naïve Switching Optimized Switching

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