Enabling Interoperability of WAVE Devices for MultiChannel Operations

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Enabling Interoperability of WAVE Devices for
Multi-Channel Operations

• Wendong Hu
• STMicroelectronics, Inc.
• October 20, 2009
• wendong.hu_at_st.com

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Interoperability Problem Among Various WAVE
Devices
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Objective

• To enable interoperability among the legacy and
  advanced WAVE devices for ensuring communication
  reliability of safety-critical applications,
  while maintaining the desirable advantages of
  these devices (i.e. low-cost, simple operations
  for the legacy devices, and higher performance
  and spectrum efficient for the advanced devices).
• Two fundamental scenarios are considered
• When the Safety Channel (Channel 172) is
  available
• Focused in this presentation
• When the Safety Channel is NOT available

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Interoperability when the Safety Channel is
available

• Types of WAVE devices need to be interoperable
• Dual-radio devices that are
• Radio 1 Always on the safety channel
• Radio 2 Always on Control channel or Service
  channel
• Single-radio devices that are always on the
  safety channel
• Single-radio devices that are switching between
  Safety Channel, Control Channel, and the Service
  Channel
• Proposed scheme for interoperability
• Allocate the Safety Channel Interval in the
  operation periods

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Allocation for Single-radio Devices Performing
Channel Switching
Current allocation
Proposed allocation
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Allocation for Single-radio Devices Always on the
Safety Channel and Dual-radio
Single-radio always-on Safety Channel
Dual-radio
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Interoperations between Single-radio (Channel
Switching) Devices and Single-radio (Always-On)
Devices
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Interoperations between Single-radio (Channel
Switching) Devices and Dual-radio Devices
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Interoperations between Single-radio (Channel
Switching) Devices and Dual-radio Devices (contd)
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Putting everything together
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Summary

• When the Safety Channel (Channel 172) is
  available, allocate the Safety Channel Interval
  in the synchronized operation periods in which
  all WAVE devices need to switch to the Safety
  Channel.
• The common Safety Channel Interval enable
  interoperability among the legacy and advanced
  WAVE devices for ensuring communication
  reliability of safety-critical applications,
  while maintaining the desirable advantages of
  these devices
• Only the advanced WAVE devices (dual devices and
  always-on single-radio devices) that detect
  legacy single-radio (channel-switching) devices
  need to adjust their behaviors for interoperable
  with the legacy devices. All other advanced
  devices can stay in the Normal mode.
• Similar procedure can be applied to enable
  interoperability among various WAVE devices in
  the regulatory domain where the Safety Channel is
  NOT available without allocating the Safety
  Channel Interval.