One-shot transmission for V2X messaging
A sequence of connected messages is transmitted using Semi-Persistent Scheduling (SPS) of a predefined period. A random value for a 1-shot duration timer is set, the random value being chosen as being between a minimum and a maximum multiple of the predefined period. Responsive to expiration of the 1-shot duration timer, 1-shot resources are allocated for a 1-shot transmission, independent of SPS-allocated resources of the SPS, and a next packet of the sequence of connected messages is transmitted as a 1-shot message using the 1-shot resources instead of using the SPS-allocated resources of the SPS.
1 . A system for performing duration-based 1-shot messaging, comprising:
a transceiver; and
a controller configured to
transmit a sequence of connected messages using Semi-Persistent Scheduling (SPS) of a predefined period,
set, for a 1-shot duration timer, a random duration value that defines an elapsed-time interval for the 1-shot duration timer, the random value being chosen as an integer number of the predefined period that is between a minimum and a maximum multiple of the predefined period,
start the 1-shot duration timer based on the elapsed-time interval, and
responsive to expiration of the 1-shot duration timer, allocate 1-shot resources for a 1-shot transmission, independent of SPS-allocated resources of the SPS, and transmit a next packet of the sequence of connected messages as a 1-shot message using the 1-shot resources instead of using the SPS-allocated resources of the SPS.
2 . The system of claim 1 , wherein the transceiver and the controller are embedded within a Vehicle-to-everything (V2X)-enabled vehicle in communication with other V2X-vehicles.
3 . The system of claim 1 , wherein the transceiver and the controller are embedded within a roadside unit in communication with V2X-enabled vehicles.
4 . The system of claim 1 , wherein the sequence of connected messages are formed in accordance with society of automotive engineers (SAE) standard document J2735.
5 . The system of claim 1 , wherein the minimum and the maximum multiple of the predefined period are set as integer multiples of the predefined period.
6 . The system of claim 1 , wherein the maximum multiple of the predefined period is set as a maximum time interval for a V2X application to receive updates from other vehicles.
7 . The system of claim 1 , wherein the predefined period is 100 ms, the minimum is twice the predefined period, and the maximum is six times the predefined period.
8 . A method for performing duration-based 1-shot messaging, comprising
transmitting a sequence of connected messages using Semi-Persistent Scheduling (SPS) of a predefined period;
setting, for a 1-shot duration timer, a random duration value that defines an elapsed-time interval for the 1-shot duration timer, the random value being chosen as an integer number of the predefined period that is between a minimum and a maximum multiple of the predefined period;
start the 1-shot duration timer based on the elapsed-time interval; and
responsive to expiration of the 1-shot duration timer, allocating 1-shot resources for a 1-shot transmission, independent of SPS-allocated resources of the SPS, and transmitting a next packet of the sequence of connected messages as a 1-shot message using the 1-shot resources instead of using the SPS-allocated resources of the SPS.
9 . The method of claim 8 , wherein the sequence of connected messages are formed in accordance with society of automotive engineers (SAE) standard document J2735.
10 . The method of claim 8 , wherein the minimum and the maximum multiple of the predefined period are set as integer multiples of the predefined period.
11 . The method of claim 8 , wherein the maximum multiple of the predefined period is set as a maximum time interval for a V2X application to receive updates from other vehicles.
12 . The method of claim 8 , wherein the predefined period is 100 ms, the minimum is twice the predefined period, and the maximum is six times the predefined period.
13 . A y computer-readable medium comprises instructions for performing duration-based 1-shot messaging that, when executed by a controller in communication with a V2X transceiver, cause the controller to perform operations including to:
transmit a sequence of connected messages using Semi-Persistent Scheduling (SPS) of a predefined period;
set, for a 1-shot duration timer, a random duration value that defines an elapsed-time interval for the 1-shot duration timer, the random value being chosen as an integer number of the predefined period that is between a minimum and a maximum multiple of the predefined period;
start the 1-shot duration timer based on the elapsed-time interval; and
responsive to expiration of the 1-shot duration timer, allocate 1-shot resources for a 1-shot transmission, independent of SPS-allocated resources of the SPS, and transmit a next packet of the sequence of connected messages as a 1-shot message using the 1-shot resources instead of using the SPS-allocated resources of the SPS.
14 . The medium of claim 13 , wherein the transceiver and the controller are embedded within a Vehicle-to-everything (V2X)-enabled vehicle in communication with other V2X-vehicles.
15 . The medium of claim 13 , wherein the transceiver and the controller are embedded within a roadside unit in communication with V2X-enabled vehicles.
16 . The medium of claim 13 , wherein the sequence of connected messages are formed in accordance with society of automotive engineers (SAE) standard document J2735.
17 . The medium of claim 13 , wherein the minimum and the maximum multiple of the predefined period are set as integer multiples of the predefined period.
18 . The medium of claim 13 , wherein the maximum multiple of the predefined period is set as a maximum time interval for a V2X application to receive updates from other vehicles.
19 . The medium of claim 13 , wherein the predefined period is 100 ms, the minimum is twice the predefined period, and the maximum is six times the predefined period.