Grant-Free Transmission Pilot Signal Mode Selection
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Solution Overview
Problem
In next-generation wireless communications networks, the grant-free transmission mode faces challenges with high signaling overhead and transmission latency due to large-scale user access, leading to reduced reliability and increased complexity for the receive end in processing data.
Innovation Solution
A terminal device determines a data processing mode, processes data accordingly, and sends a pilot signal to allow the receive end to determine the processing mode, thereby reducing complexity and improving reliability by selecting appropriate modulation and coding modes based on channel state and feedback information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If grant-free transmission mode is used to support large quantity of access users, then user access capacity is improved, but transmission reliability deteriorates due to contention conflict
Solution Approach 1:
The patent applies parameter changes by dynamically selecting different data processing modes (modulation and coding modes, interleaving modes, spreading modes) based on channel conditions and feedback information. This allows the system to adapt transmission parameters to reduce contention conflicts and improve reliability while maintaining high user access capacity in grant-free transmission
2Adaptability or versatility
If receive end performs blind detection on data processing mode, then adaptability is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by having the terminal device determine and process data according to a predetermined data processing mode before transmission. The terminal also determines a pilot signal based on this mode and sends both the pilot signal and processed data. This allows the receive end to determine the data processing mode based on the pilot signal without performing complex blind detection, thus reducing processing complexity while maintaining adaptability
Solution Approach 2:
The patent uses the pilot signal as an intermediary that carries information about the data processing mode. The terminal device embeds mode information in the pilot signal, which then serves as a mediator that enables the receive end to identify the processing mode without complex blind detection, reducing computational complexity while preserving adaptability
3Reliability
If scheduling/grant mechanism is used for uplink transmission, then transmission reliability is improved, but signaling overhead and scheduling pressure increase
Solution Approach 1:
The patent extracts the essential function of reliability assurance from the complex scheduling/grant mechanism by using a simplified approach: the terminal device autonomously selects data processing modes and sends a pilot signal indicating the mode. This extracts the core reliability function while removing the heavy signaling overhead and scheduling pressure of traditional grant-based mechanisms
Data Source
AI summary
Embodiments of this application provide an information transmission method and a device, so as to improve communication reliability and reduce complexity of processing by a receive end. The method includes: determining, by a terminal device, a data processing mode, where the data processing mode includes a modulation and coding mode; processing data based on the data processing mode; determining a pilot signal based on the data processing mode; and sending the pilot signal and processed data.