V2X Waveform Selection via DCI Indication
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Solution Overview
Problem
In the Internet of Vehicles (IoV) system, there is a challenge in selecting the appropriate transmission waveform for data transmission between vehicles, particularly in V2X systems using LTE-D2D technology, where both CP-OFDM and DFT-OFDM waveforms are supported, but there is no clear method to determine which waveform to use for sending and receiving data.
Innovation Solution
A method where a terminal device determines the transmission waveform for a channel based on configuration information, resource pools, carriers, and pre-configured correspondence relationships, and a network device sends configuration information to the terminal device to indicate the appropriate waveform for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transmission waveforms (CP-OFDM and DFT-OFDM) are supported in NR-V2X for flexible resource configuration, then the adaptability and versatility of the transmission system are improved, but the complexity of waveform selection and configuration increases
Solution Approach 1:
The patent applies parameter changes by introducing a waveform indication field in the downlink control information (DCI) that can dynamically indicate different transmission waveforms (CP-OFDM or DFT-OFDM). This allows the system to switch between different waveform parameters based on channel conditions and service requirements, resolving the contradiction by providing flexible waveform selection through controlled parameter variation rather than fixed configuration
Solution Approach 2:
The patent implements dynamics by enabling dynamic waveform selection through real-time indication in DCI messages. The network can dynamically adjust the transmission waveform based on current channel conditions, traffic patterns, and service requirements, transforming the static waveform configuration into a dynamic adaptive system that balances versatility with manageable complexity through centralized control
2Ease of operation
If the terminal device autonomously selects transmission waveform without clear guidelines, then the operation flexibility is improved, but the transmission reliability and consistency deteriorate due to waveform selection ambiguity
Solution Approach 1:
The patent applies feedback by implementing a centralized waveform indication mechanism where the network device provides explicit waveform selection instructions to terminal devices through DCI. This feedback loop ensures that all terminals use consistent waveforms for the same data transmissions, eliminating autonomous selection ambiguity while maintaining operational simplicity through clear network-directed guidance
Solution Approach 2:
The patent introduces an intermediary (the network device) that mediates waveform selection between multiple terminal devices. The network acts as a coordinator that receives channel quality feedback and service requirements, then issues standardized waveform indications to ensure consistent and reliable transmissions across the V2X system, resolving the reliability issue while preserving ease of operation through simplified terminal behavior
3Ease of manufacture
If waveform configuration is left undefined in the standard, then the ease of implementation is improved, but the loss of information occurs due to ambiguity in waveform selection criteria
Solution Approach 1:
The patent applies preliminary action by pre-defining the waveform indication mechanism in the standard specification, including the format of the indication field in DCI and the mapping between indication values and specific waveforms. This preliminary standardization provides clear waveform selection criteria before actual deployment, eliminating information loss while maintaining implementation simplicity through standardized procedures
Data Source
AI summary
Disclosed in the present invention are a data transmission method, a terminal device, a network device and a computer storage medium. The method includes: determining, by the terminal device, a transmission waveform used by a first channel; and performing, by the terminal device, data transmission on the first channel according to the transmission waveform.