Method for low-power V2X based on early reception termination
Device comprising a vehicle-to-everything (V2X) communications receiver configured to determine, using V2X communications, that a vehicle is a safety-relevant vehicle posing a potential danger to a vulnerable road user (VRU), and to receive only transmissions of the safety-relevant vehicle and skip reception of transmissions of non-safety-relevant vehicles, thereby lowering V2X reception power consumption of a device carried by the VRU, and methods for used thereof.
1. A method, comprising:
determining, using vehicle-to-everything (V2X) communications, that a vehicle is a safety-relevant vehicle posing a potential danger to a vulnerable road user (VRU); and
receiving only transmissions of the safety-relevant vehicle and skipping reception of transmissions of non-safety-relevant vehicles by:
identifying periodically a slot and a respective subchannel for V2X transmission of the safety-relevant vehicle, and receiving the current slot and respective subchannel if the current slot and respective subchannel are identified as allocated to the safety-relevant vehicle, or skipping the reception of the current slot and respective subchannel if the current slot and respective subchannel are not identified as allocated to the safety-relevant vehicle,
terminating the reception of the current slot and respective subchannel if the current slot and respective subchannel are identified as allocated to the safety-relevant vehicle but do not include transmissions of the safety-relevant vehicle, and
if the current slot and respective subchannel do not include transmissions of the safety-relevant vehicle, scanning for transmissions of the safety-relevant vehicle in slots and respective subchannels proximal to the current slot and subchannel and, upon finding such proximal slots and respective subchannels, updating a database with the found slots and respective subchannels,
thereby lowering V2X reception power consumption of a device carried by the VRU.
2. The method of claim 1 , wherein the determining that a vehicle is a safety-relevant vehicle includes receiving V2X messages from a plurality of vehicles during a predetermined period and grading the safety-relevance of each vehicle using a respective respective location, speed, and heading of each vehicle.
3. The method of claim 1 , wherein the terminating of the reception current slot and respective subchannel includes activating a V2X receiver, measuring subchannel energy received during an AGC symbol, comparing the measured energy of each subchannel with a threshold, and if, the measured energy is lower than the threshold, terminating the reception.
4. A device, comprising: a vehicle-to-everything (V2X) receiver configured to determine, using V2X communications, that a vehicle is a safety-relevant vehicle posing a potential danger to a vulnerable road user (VRU), and to receive only transmissions of the safety-relevant vehicle and skip reception of transmissions of non-safety-relevant vehicles, thereby lowering V2X reception power consumption of a device carried by the VRU, wherein the V2X receiver includes an adaptive gain control (AGC) unit configured to measure subchannel energy and wherein the device further comprises a slot filter that provides an input used by the AGC unit to decide whether to receive or stop reception of the packet.
5. The device of claim 4 , wherein the V2X receiver includes a data channel receiver and a control channel receiver, and wherein the device further comprises a L1 ID filter configured to hold an expected L1 ID value and to match the expected L1 ID value with a L1 ID value received in a physical sidelink control channel (PSCCH) by the control data receiver.
6. The device of claim 5 , wherein if the AGC unit did not stop reception and if the expected L1ID value matched the received L1 ID value, the L1 ID filter is further configured to store a physical sidelink data channel (PSSCH) only for the given subchannel.
7. The device of claim 4 , further comprising a safety-relevant vehicles controller configured to determine that a vehicle is to be monitored with a given periodicity, and to provide to the V2X receiver an input to determine that the vehicle is a safety-relevant vehicle.
8. The device of claim 4 , further comprising a safety-relevant vehicles controller configured to determine that a vehicle is to be monitored with a given periodicity, and to provide to the V2X receiver an input to determine that the vehicle is a safety-relevant vehicle.
9. The device of claim 5 , further comprising a safety-relevant vehicles controller configured to determine that a vehicle is to be monitored with a given periodicity, and to provide to the V2X receiver an input to determine that the vehicle is a safety-relevant vehicle.
10. The device of claim 6 , further comprising a safety-relevant vehicles controller configured to determine that a vehicle is to be monitored with a given periodicity, and to provide to the V2X receiver an input to determine that the vehicle is a safety-relevant vehicle.