1. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 1 IEEE 802.11p Draft Review Wayne Fisher Broady Cash ARINC, Inc Annapolis, MD

2. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 2 DSRC and WAVE Terminology DSRC – Dedicated Short-range Communications is the name of the 5.9 GHz Band allocated for the ITS communications WAVE – Wireless Access in Vehicular Communications is the mode of operation used by IEEE 802.11 devices to operate in the DSRC band

3. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 3 DSRC Devices DSRC Devices are IEEE 802.11 systems using the WAVE mode of operation in the DSRC band

4. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 4 Implementing WAVE Mode 5.1.2.6 WAVE Mode –The WAVE mode is used to allow IEEE 802.11 units in the DSRC band to both broadcast messages and establish almost instantaneous links for data transfer with fast moving vehicles –The WAVE mode provides two basic types of communication services: Broadcast – Listener Provider – User

5. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 5 Implementing WAVE Mode, 2 Settings on power-up to operate in the WAVE Mode –a. Channel scan shall be disabled. –b. The channel shall be set to 178. –c. The data rate shall be set to 6 Mbps. –d. The unit shall be able to receive at any mandatory data rate.

6. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 6 Implementing WAVE Mode, 3 Roadside Units (RSUs) meet the FCC Safety Message priority requirement by broadcasting Safety messages in Message Elements in Beacon or Action Frames primarily on the Control Channel Onboard Units (OBUs) meet the FCC Safety Message priority requirement by broadcasting Safety messages in Message Elements in Action Frames primarily on the Control Channel

7. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 7 Implementing WAVE Mode, 4 Non-Safety Messages are sent in Message Elements in Action Frames For RSUs the message duration is limited to 750 us and a minimum interval of 100 ms. For OBUs the message duration shall be limited to 580 us at a minimum interval of 750 ms

8. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 8 Implementing WAVE Mode, 5 Roadside Units initiate a link by sending a Provider Service Table (PST) in Beacon Frames on the Control Channel Onboard Units initiate a link by sending a PST in Action Frames on the Control Channel

9. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 9 Implementing WAVE Mode, 6 In establishing the link for data transfer the operating channel is switched from the Control Channel to a Service Channel Continued WAVE Mode operation may be implemented on this Service Channel or routine BSS or IBSS operations may be implemented

10. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 10 WAVE Mode Performance Requirements 5.1.2.2 WAVE Communications DSRC devices operating in the WAVE Mode are capable of transferring messages to and from vehicles each traveling at speeds up to 140 km/h with a Packet Error Rate (PER) of less than 10% for PSDU lengths of 1000 bytes and to and from vehicles at speeds up to a minimum of 200 km/h with a PER of less than 10 % for PSDU lengths of 64 bytes. For vehicle-to-vehicle communications DSRC devices are capable of transferring messages at closing speeds of up to a minimum of 283 km/h with a PER of less than 10 % for PSDU lengths of 64 bytes.

11. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 11 Multiple DSRC Devices Single device One device operating on one channel at a time or 5.1.2.10 Multiple Devices Multiple devices each implementing a separate function or application on a different frequency –Multi-device configurations have the advantage of being able to listen for safety messages on the Control Channel and simultaneously conduct an application transaction on one of the two Service Channels at the edge of the DSRC band or in the U-NII band.

12. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 12 RSSI for WAVE 17.2.3.2 RXVECTOR RSSI For the WAVE mode, subsequent to a period of no less than 2 ms after an alert signal, the minimum RSSI resolution should be less than or equal to 0.2 dB and shall be accurate to ± 1 dB across the entire operating temperature range within -60 to -30 dBm of the receiving signal range

13. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 13 WAVE Spectrum Mask Offset(MHz) Class ± 4.5± 5.0± 5.5± 10± 15 Reduction in Power Spectral Density, dBr Class A0-10-20-28-40 Class B0-16-20-28-40 Class C0-26-32-40-50 Class D0-35-45-55-65

14. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 14 Back-up Info:

15. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 15 IEEE 802.11e Reference 7.1.2 General frame format Insert the following text at the end of subclause 7.1.2: For WAVE implementation the QoS Control field shall be used as defined in IEEE 802.11e, Clause 7.1.3.5.

16. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 16 Correlate with 802.11j WAVE Channel Implementation –Seven 10 MHz channels Data Rates for WAVE (Mbits/s) –3, 4.5, 6, 9, 12, 18, 24, 27 Modulations –BPSK OFDM, QPSK OFDM, –16-QAM OFDM, 64-QAM OFDM

17. doc.: IEEE 802.11-04/1074r0 Submission September 2004 WKFisher/ARINCSlide 17 Correlate with 802.11j, 2 OFDM PHY characteristics Characteristics802.11a ValueWAVE Values –aSlotTime9  s16  s –aSIFSTime16  s32  s –aCCATime< 4  s< 8  s –aCHSwitchTimeN/A< 2 ms –aAirPropagationTime<< 1  s< 4  s –aMACProcessing Delay< 2  s< 2  s –aPreambleLength20  s40  s –aPLCPHeaderLength4  s8  s