DMRS Resource Offset for Interference-Free CoMP Reception
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Solution Overview
Problem
In coordinated multipoint transmission systems, the overlap of time-frequency resources between demodulation reference signals and data signals leads to interference, causing degradation in data reception performance at the reception point.
Innovation Solution
The method involves transmitting indication information to the reception point to determine the time-frequency resource locations of demodulation reference signals, allowing the reception point to exclude these locations from data reception, thereby preventing interference and improving data receiving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmission points coordinate to transmit data to a reception point using MIMO technology, then data rate and signal quality are improved, but time-frequency resource overlap between DMRS and data signals causes interference and degrades reception performance
Solution Approach 1:
The patent segments the time-frequency resource by introducing a resource offset mechanism that separates DMRS and data signal mappings. By calculating offset values based on transmission point identifiers and configuration information, the system divides the resource space to prevent overlap between DMRS and data signals from different transmission points, thereby eliminating interference while maintaining MIMO benefits.
Solution Approach 2:
The patent introduces indication information as an intermediary element that carries configuration details about DMRS resource locations. This indication information acts as a mediator between transmission points and the reception point, enabling the reception point to correctly identify and exclude DMRS resources from data reception, thus preventing interference without affecting data rate.
2Measurement precision
If DMRS from multiple transmission points are mapped to time-frequency resources, then channel estimation capability is improved, but resource overlap prevents correct DMRS reception and channel estimation
Solution Approach 1:
The patent applies local quality by assigning unique resource offset characteristics to different transmission points based on their identifiers. Each transmission point's DMRS is mapped with specific offset values that make its resource location distinguishable from other transmission points' DMRS and data signals. This localized resource differentiation ensures that the reception point can correctly receive and estimate channels from each transmission point without interference.
3Productivity
If data and DMRS share the same time-frequency resource location, then resource utilization efficiency is improved, but interference occurs and reception performance degrades
Solution Approach 1:
The patent resolves the resource conflict by introducing an additional dimension - the resource offset parameter. Instead of only using time-frequency grid coordinates for resource mapping, the system incorporates offset values that shift DMRS mappings relative to data signal mappings. This dimensional extension allows both signals to coexist in the time-frequency space without overlapping, eliminating interference while maintaining efficient resource utilization.
Data Source
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Figure 3A~3B
AI summary
Embodiments of this application disclose a communication method, and a related device and system. The method includes: receiving, by a reception point, first indication information, where the first indication information is used to indicate a time-frequency resource location of a first demodulation reference signal of first data; receiving, by the reception point, second indication information, where the second indication information is used to indicate a time-frequency resource location of a second demodulation reference signal; and determining, by the reception point, a time-frequency resource location of the first data based on the time-frequency resource location of the second demodulation reference signal, and demodulating the first data based on the first demodulation reference signal. Receiving performance of the reception point can be improved. On the premise that a resource conflict does not occur, two base stations communicate with a terminal device by using a time-frequency resource allocated by a second base station.