Message relaying in vehicle-to-vehicle communication system
First Claim
1. A road side unit (RSU) for a vehicle-to-vehicle (V2V) communication system, the RSU comprising:
- first and second antennas that both concurrently receive a first message from a first vehicle and a second message from a second vehicle and generate respective first and second receive (RX) signals, wherein the first and second antennas are both located at the RSU and are separated by a distance less than a signal wavelength of the first and second messages as received at the first and second antennas; and
a signal processor that performs spatial filtering to recover (i) the first message from the first and second RX signals using a first directional beam-pattern and (ii) the second message from the first and second RX signals using a second directional beam-pattern that is not parallel to the first directional beam-pattern, wherein the signal processor generates at least a first transmit (TX) signal for the first antenna to enable the second vehicle to receive the first message and the first vehicle to receive the second message.
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Accused Products
Abstract
In a vehicle-to-vehicle communication system, an intersection-located road side unit (RSU) having two omni-antennas applies spatial filtering to the antennas'"'"' RX signals to recover first and second overlapping basic safety messages (BSMs) concurrently transmitted by two intersection-approaching vehicles that have no direct line of sight (NLOS) between them. The RSU retransmits each BSM for receipt by the other vehicle using either an omnidirectional retransmission technique in which the two messages are sequentially transmitted using an omnidirectional beam-pattern, a directional retransmission technique in which the two messages are sequentially transmitted using directional beam-patterns, or an XOR retransmission technique in which the RSU applies an XOR operation to the two BSMs and transmits the resulting XOR message using an omnidirectional beam-pattern. A receiving vehicle can apply an XOR operation to the XOR message and a local copy of the first BSM message to recover the second BSM message.
14 Citations
34 Claims
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1. A road side unit (RSU) for a vehicle-to-vehicle (V2V) communication system, the RSU comprising:
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first and second antennas that both concurrently receive a first message from a first vehicle and a second message from a second vehicle and generate respective first and second receive (RX) signals, wherein the first and second antennas are both located at the RSU and are separated by a distance less than a signal wavelength of the first and second messages as received at the first and second antennas; and a signal processor that performs spatial filtering to recover (i) the first message from the first and second RX signals using a first directional beam-pattern and (ii) the second message from the first and second RX signals using a second directional beam-pattern that is not parallel to the first directional beam-pattern, wherein the signal processor generates at least a first transmit (TX) signal for the first antenna to enable the second vehicle to receive the first message and the first vehicle to receive the second message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A road side unit (RSU) for a vehicle-to-vehicle (V2V) communication system, the RSU comprising:
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first and second antennas that both concurrently receive a first message from a first vehicle and a second message from a second vehicle and generate respective first and second receive (RX) signals; and a signal processor that performs spatial filtering to recover (i) the first message from the first and second RX signals using a first directional beam-pattern and (ii) the second message from the first and second RX signals using a second directional beam-pattern that is not parallel to the first directional beam-pattern, wherein the signal processor generates at least a first transmit (TX) signal for the first antenna to enable the second vehicle to receive the first message and the first vehicle to receive the second message, wherein the signal processor comprises; a first RX filter that combines the first and second RX signals based on the first directional beam-pattern to generate a first incoming beam-pattern signal; a second RX filter that combines the first and second RX signals based on the second directional beam-pattern to generate a second incoming beam-pattern signal; a transceiver that recovers (i) the first message from the first incoming beam-pattern signal and (ii) the second message from the second incoming beam-pattern signal, wherein; the transceiver determines that the first message is to be retransmitted for receipt by the second vehicle and that the second message is to be retransmitted for receipt by the first vehicle; and the transceiver generates at least a first outgoing signal based on at least the first message; and a first TX filter that generates at least the first TX signal for the first antenna based on the first outgoing signal. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A road side unit (RSU) for a vehicle-to-vehicle (V2V) communication system, the RSU comprising:
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first and second antennas that both concurrently receive a first message from a first vehicle and a second message from a second vehicle and generate respective first and second receive (RX) signals; and a signal processor that performs spatial filtering to recover (i) the first message from the first and second RX signals using a first directional beam-pattern and (ii) the second message from the first and second RX signals using a second directional beam-pattern that is not parallel to the first directional beam-pattern, wherein; the signal processor generates at least a first transmit (TX) signal for the first antenna to enable the second vehicle to receive the first message and the first vehicle to receive the second message; the RSU receives a third message from a third vehicle; the signal processor determines that the third message from the third vehicle is to be retransmitted for receipt by a fourth vehicle if the signal processor determines that the fourth vehicle cannot reliably receive the third message directly from the third vehicle; and the signal processor determines that the third message from the third vehicle is not to be retransmitted for receipt by the fourth vehicle if the signal processor determines that the fourth vehicle can reliably receive the third message directly from the third vehicle. - View Dependent Claims (32, 33, 34)
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Specification