Control Information Transmission in Internet of Vehicles
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Solution Overview
Problem
In the Internet of Vehicles, the automatic gain control (AGC) of radio frequency amplifiers needs time to adjust to changing received power, leading to potential errors in receiving control information due to its low error tolerance and tendency to occupy only the start symbol of a time unit.
Innovation Solution
A method and device for transmitting control information and data, where the time-frequency resource for control information and user data is determined, and the control information is transmitted to occupy at least a half of the time-domain symbols in a time unit or to precede user data, ensuring correct decoding despite AGC adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control information occupies only the start symbol of a time unit, then transmission efficiency is improved, but reliability deteriorates due to AGC adjustment errors
Solution Approach 1:
The patent applies preliminary action by ensuring that sufficient time resources are allocated to control information transmission before user data. Specifically, when control information and user data are in different time units, the control information occupies at least half of the time-domain symbols in the first time unit, guaranteeing that the receiver has adequate time to complete AGC adjustment and reliably decode control information before data transmission begins.
2Loss of time
If control information and user data are transmitted in the same time unit, then time resource utilization is improved, but control information reliability deteriorates due to AGC adjustment interference
Solution Approach 1:
The patent applies segmentation by dividing the time unit into distinct segments for control information and user data. When both are transmitted in the same time unit, the control information is allocated to specific time-domain symbols (occupying at least half), while user data occupies remaining symbols. This segmentation ensures that control information receives sufficient time resources for reliable reception despite AGC adjustments, while still achieving high time resource utilization.
Data Source
AI summary
A method and device are provided for transmitting control information and data. In the method, the device determines a time-frequency resource corresponding to control information and user data to be sent. The device transmits the control information and the user data on the time-frequency resource. In response to determining that a first time-frequency resource corresponding to the control information and a second time-frequency resource corresponding to the user data belong to the same time unit, the device set a part of the second time-frequency resource to occupy starting time-domain symbols of the time unit.