Grant-Free Data Transmission Using Reference Signal Patterns
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Solution Overview
Problem
In grant-free based data transmission mechanisms for LTE and NR systems, particularly in URLLC scenarios, there is a challenge in accurately determining the location of data transmission by the terminal device and base station, leading to increased latency and reliability issues.
Innovation Solution
A data transmission method that uses predefined data transmission patterns to indicate time domain resources, allowing the receive end to accurately determine the location of data transmission by detecting reference signals, thereby ensuring correct reception of data without the need for explicit grants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If grant-free based data transmission mechanism is used, then data transmission latency is reduced, but the ability to accurately determine data transmission location deteriorates
Solution Approach 1:
The patent introduces reference signals as an intermediary element between the data transmission mechanism and the location determination process. These reference signals are embedded within the data transmission and serve as mediators that enable the receiving end to accurately identify the transmission location without requiring traditional scheduling grants, thus resolving the contradiction between reduced latency and maintained measurement precision
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple data transmission patterns with distinct reference signal characteristics before actual data transmission occurs. The receiving end uses these pre-established patterns to quickly identify transmission locations without real-time scheduling, achieving both low latency and accurate location determination through advance preparation
2Reliability
If data transmission patterns with reference signals are used, then data transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the data transmission structure by dividing it into distinct patterns, each with specific reference signal configurations. This segmentation allows the system to achieve high reliability through diverse pattern options while managing device complexity by organizing buffer implementation into pattern-specific modules rather than a monolithic complex structure
Solution Approach 2:
The patent utilizes parameter changes by varying reference signal characteristics (such as position, sequence, or pattern) across different data transmission patterns. This enables the system to achieve high transmission reliability through parameter diversity while keeping device complexity manageable by changing software-configurable parameters rather than adding hardware complexity
Data Source
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AI summary
Embodiments of this application relate to the communications field, and disclose a data transmission method and a device, to ensure, in a grant free-based data transmission mechanism, that a receive end can accurately determine a location at which a transmit end transmits data. A specific solution is as follows: A first device determines a data transmission pattern, where the data transmission pattern corresponds to a time domain resource; and the first device sends one or more reference signals R and at least one physical channel D on the time domain resource based on the data transmission pattern, where the data transmission pattern is used to indicate symbols that are in the time domain resource and that are used for the one or more reference signals R and the at least one physical channel D.