Optimization of vehicle communications employing retransmission request protocol

A method of managing communications in a vehicle having a command unit having a processor and tangible, non-transitory memory on which instructions are recorded, the method comprising:

• selecting an uplink session for the vehicle for execution of a transmission time interval (TTI) bundling protocol defined by a TTI number, via the command unit, the TTI bundling protocol being adapted to permit data transfer in multiple consecutive sub-frames with a single acknowledgement signal for an entire bundle;
• determining if the uplink session is a low-latency application having a latency below a predefined latency threshold, via the command unit;
• selecting the TTI number to be relatively small when the latency is below the predefined latency threshold, via the command unit and selecting the TTI number to be relatively large when the latency is at or above the predefined latency threshold, via the command unit;
• executing a retransmission request protocol upon receipt of erroneous data, via the command unit;
• determining vehicle situational parameters at a beginning of a data communication cycle, via the command unit, the vehicle situational parameters including current location and navigation status of the vehicle;
• determining updated values of the vehicle situational parameters when a first retransmission according to the retransmission request protocol is detected, via the command unit;
• determining a desirable value of a retransmission frequency for the retransmission request protocol based in part on the updated values, via the command unit;
• determining if an average bit error rate for a group is greater than a predefined error rate threshold, the vehicle being part of the group, the group having requirements for both Enhanced Mobile Broadband applications and Ultra-Reliable Low Latency Communication (URLLC) applications, via the command unit;
• estimating the requirements for the Enhanced Mobile Broadband applications and the Ultra-Reliable Low Latency Communication (URLLC) applications for the group when the average bit error rate is greater than the predefined error rate threshold, via the command unit;
• reserving respective slots for the URLLC applications based on previous values of the retransmission frequency and a response time for the group, via the command unit;
• and
• maximizing switching of the respective slots from the Enhanced Mobile Broadband applications to the URLLC applications when the average bit error rate is less than or equal to the predefined error rate threshold, via the command unit.