Frequency-Domain Data Repetition for 5G NR Coverage Without Latency
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Solution Overview
Problem
The high frequency signals in 5G NR systems face limitations in coverage due to large path loss and require TTI bundling for enhanced coverage, which increases latency and is unsuitable for real-time applications.
Innovation Solution
Implementing a frequency-domain repetition mode for data transmission, where the same data is repeatedly sent on different frequency-domain resources to enhance demodulation performance and coverage, using methods like continuous or discontinuous resource mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If TTI bundling is used to enhance coverage of high frequency signals, then coverage distance is improved, but latency increases
Solution Approach 1:
The patent transitions from time-domain repetition (TTI bundling) to frequency-domain repetition. Instead of repeating transmissions across multiple time intervals, the system repeats data across multiple frequency resources within a single time interval, thereby achieving coverage enhancement without the latency penalty of sequential time-based repetition.
Solution Approach 2:
The patent changes the repetition dimension parameter from time to frequency. By configuring repetition information that specifies frequency-domain resources rather than time-domain resources, the system achieves the same coverage enhancement effect as TTI bundling but with significantly reduced latency, as all repetitions occur simultaneously across different frequency carriers.
2Reliability
If data is repeatedly transmitted on multiple consecutive TTI resources through TTI bundling, then transmission quality is improved, but time for correct demodulation is prolonged
Solution Approach 1:
The patent moves the repetition operation from the time dimension to the frequency dimension. Multiple frequency-domain repetitions are performed parallelly within a single TTI, allowing the receiver to combine repetitions from different frequency carriers simultaneously rather than sequentially, thus maintaining transmission quality while reducing demodulation time.
Solution Approach 2:
The patent enables continuous and parallel processing of repeated data across multiple frequency resources within the same time interval. The receiver can continuously combine signals from different frequency carriers without waiting for sequential time-based repetitions, maintaining uninterrupted demodulation activity and reducing overall processing time.
3Object-affected harmful factors
If high frequency signals are used in 5G NR systems, then anti-interference capability is improved, but path loss increases
Solution Approach 1:
The patent combines multiple frequency-domain repetitions of the same data across different frequency carriers. By merging these repeated signals at the receiver through combination processing, the system achieves signal diversity and improves the signal-to-interference ratio, effectively compensating for the high path loss of 5G NR frequency bands while maintaining the anti-interference advantages of high-frequency signals.
Data Source
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AI summary
Embodiments of the present invention disclose a data transmission method and a communications device. The method in the embodiments of the present invention includes: obtaining, by a first communications device, a transmission mode instruction, where the transmission mode instruction is used to instruct to use a frequency-domain repetition mode to transmit data, and the frequency-domain repetition mode means that same data is repeatedly transmitted on different frequency-domain resources; determining, by the first communications device, the frequency-domain repetition mode based on the transmission mode instruction; and performing, by the first communications device, data transmission with a second communications device in the frequency-domain repetition mode. The embodiments of the present invention further provide a communications device, to increase a coverage distance of a communications system.