A car-to-road communication protocol method for taxi data transmission

By introducing pole position pilots and broadcast media access control fields into vehicle-to-infrastructure communication for taxi data transmission, the problems of uncertain broadcast source addressing and multi-vehicle concurrent collisions are solved, thereby improving the reliability and efficiency of taxi data transmission.

CN121664789BActive Publication Date: 2026-07-21BEIJING INST OF METROLOGY & TESTING SCI
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Patent Information

Application Number
CN202610170530.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-02-06
Publication Date
2026-07-21
Estimated Expiration
2046-02-06

AI Technical Summary

Technical Problem

In the context of taxi meter calibration and operation monitoring, existing technologies suffer from uncertainties in broadcast source addressing and binding, as well as collisions caused by multiple vehicles concurrently going uplinking, affecting the timing determinism and link efficiency of data interaction.

Method used

By introducing a pole position pilot field and a broadcast media access control field into the downlink trigger frame, the vehicle-mounted antenna identifies the pole position pilot to obtain the road segment identifier and pole number, calculates the time slot index, and schedules the transmission of uplink data frames according to the time slot index. The roadside antenna receives and confirms the data, and a two-level time slot index mechanism is used to handle collisions or frame drops.

Benefits of technology

It enables the identification and verification of roadside broadcast sources, reduces the risk of misbinding under conditions of cross-pole coverage or adjacent pole overlap, reduces the probability of co-frequency collisions and retransmissions under conditions of multiple vehicles operating concurrently, and improves the success rate of interactive closed loops.

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Abstract

The application discloses a car-road communication protocol method for taxi data transmission and relates to the technical field of car-road cooperative communication, which comprises the following steps: splicing a four-byte pole position pilot field before a downlink trigger frame header and setting a broadcast medium access control field in the frame; a road-side antenna sends a downlink trigger frame, a vehicle-mounted antenna identifies the pilot field to obtain a road section identifier and a pole serial number, and verifies the consistency with the broadcast medium access control field; the vehicle-mounted antenna calculates a time slot index according to the pole position pilot field and the broadcast medium access control field, determines and sends an uplink confirmation frame according to a receiving completion time, a vehicle-mounted processing offset and a time slot length; a communication terminal obtains a current data frame serial number of a taximeter and a vehicle mileage through a serial port, generates a time domain byte and sends an uplink data frame according to the time slot index; a road-side antenna establishes a time slot window to receive and judge the uplink data frame, and then sends a confirmation after eliminating the redundancy; if the time is out, a secondary time slot index is generated to resend the uplink data frame, so that the misbinding and collision are reduced, and the closed loop success rate is improved.
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