Vehicular Communication Device Beacon Transmission for Channel Overload

The patent applies local quality by differentiating the behavior of vehicular communication devices based on their individual reception status. Only devices that have successfully received the WSA message and detected other devices' non-reception status will broadcast piggybacked beacon messages. This selective approach ensures that service advertisement information is propagated to devices that need it without causing unnecessary channel overload from devices that already have the information.

The patent uses successfully receiving vehicles as intermediaries to transmit WSA messages to devices that missed the original broadcast. Instead of all devices broadcasting, only those with confirmed reception status act as mediators, forwarding the service advertisement information to devices in their vicinity that indicated non-reception, thereby efficiently propagating information without overwhelming the channel.

The patent implements local quality by making the beacon message broadcasting behavior conditional and localized. Only vehicles in specific situations (those that received WSA and detected non-reception by others) will broadcast piggybacked messages. This targeted approach ensures adequate service advertisement dissemination coverage while preventing the channel overload that would degrade QoS service quality.

The patent applies partial action by having only a subset of vehicular communication devices broadcast piggybacked beacon messages rather than all devices. This partial participation is sufficient to achieve wide dissemination of service advertisement information to devices that missed the original broadcast, while avoiding the excessive broadcasting that would cause channel overload and QoS degradation.