Reference Signal Frequency Reference Point Alignment
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Solution Overview
Problem
In wireless communications systems using time division duplex (TDD) mode, cross-link interference (CLI) occurs between base stations due to differing transmission directions and geographical distances, leading to interference in uplink signals, and there is no standardized mechanism for measurement between base stations to identify interfering signals.
Innovation Solution
A method for determining and sending reference signals based on shared frequency reference points within specific frequency bands, allowing base stations to detect and synchronize reference signals, thereby enabling correct signal transmission and measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each base station independently configures a common reference point in frequency domain, then each base station can generate its own reference signal, but different base stations configure different reference points leading to different reference signals at the same frequency domain location that cannot be detected by other base stations
Solution Approach 1:
The patent applies homogeneity by requiring all base stations to use the same frequency reference point for generating reference signals. This ensures that reference signals at the same frequency domain location are consistent across different base stations, enabling proper detection and channel measurement between base stations without requiring complex coordination mechanisms.
2Adaptability or versatility
If base stations use different frequency reference points, then each base station can optimize for its own frequency band, but reference signals cannot be synchronized across base stations for inter-base station measurement
Solution Approach 1:
The patent implements universality by establishing a common frequency reference point that serves all base stations simultaneously. This universal reference point enables reference signals to be generated consistently across different base stations while maintaining adaptability to different frequency bands through the standardized reference signal generation process.
3Power
If downlink signal power is increased to improve downlink transmission quality, then downlink signal strength is improved, but the downlink signal causes stronger interference to uplink signals at other base stations
Solution Approach 1:
The patent substitutes mechanical power control with a signal processing approach using reference signals. Instead of reducing downlink power to avoid interference, the system uses standardized reference signals with known characteristics that enable the receiving base station to measure and compensate for interference effects, allowing high power transmission without compromising uplink reception quality.
Data Source
AI summary
This application provides a reference signal sending method, a reference signal receiving method, an apparatus, and a device, to provide a reference signal sending or receiving mechanism. A first network device determines at least one frequency reference point. The first network device generates a reference signal based on the at least one frequency reference point, and sends the reference signal in the first frequency band. A frequency reference point is determined based on a frequency band. In this case, both the first network device that sends the reference signal and a second network device that receives the reference signal may determine the frequency reference point based on the frequency band, and the two network devices may determine a same reference signal at a same frequency domain location, so that the reference signal sent by the first network device can be correctly detected by the second network device.