Antenna Weight Calculation via Subframe Reference Signals
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Solution Overview
Problem
In MIMO systems where the number of antenna ports is less than the total number of antennas, the gain of the precoding matrix is reduced due to incomplete channel state information, leading to inefficient signal transmission.
Innovation Solution
The network device sends reference signals through specific subframes corresponding to different antennas, allowing the terminal device to determine whether to filter them based on the subframe, thereby distinguishing between channels and enhancing antenna weight calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the network device uses fewer antenna ports than total antennas, then the device complexity is reduced, but the precoding matrix gain is reduced
Solution Approach 1:
The patent segments the reference signal transmission by associating different reference signals with different antennas through subframe mapping. Each antenna's reference signal is transmitted in specifically designated subframes, allowing the terminal to distinguish and measure channels of individual antennas even when antenna ports are fewer than total antennas. This segmentation enables accurate channel state information acquisition for precoding optimization.
Solution Approach 2:
The patent introduces a time dimension (subframe) to differentiate between antennas. Instead of relying solely on spatial separation through multiple antenna ports, the system uses temporal separation by mapping reference signals of different antennas to different subframes. This dimensional transformation allows the terminal to obtain distinct channel measurements for each antenna, maintaining precoding effectiveness despite reduced antenna port quantity.
2Measurement precision
If the terminal device filters reference signals, then the measurement precision is improved, but the channel distinction between different antennas is lost
Solution Approach 1:
The patent establishes a feedback mechanism where the terminal device measures reference signals in specific subframes and reports channel state information back to the network device. The network device uses this feedback to determine antenna weights and optimize precoding. This feedback loop enables the system to maintain measurement precision while preserving antenna channel distinction through intelligent signal processing and information reporting.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the mapping relationship between antennas and subframes before reference signal transmission. The network device determines in advance which subframes correspond to which antennas, and the terminal device uses this prior knowledge to selectively measure and process reference signals. This preliminary arrangement enables the terminal to distinguish antenna channels while maintaining measurement precision without requiring post-processing filtering that would lose information.
Data Source
AI summary
A communication method and apparatus, a network device, a terminal device, and a system. The method includes: a network device sends a first reference signal to a terminal device through a first port in a first preset subframe corresponding to a first antenna and sends a second reference signal to the terminal device through the first port in a second preset subframe corresponding to a second antenna. Then, the network device receives first measurement information and second measurement information that are sent by the terminal device, where the first measurement information is measurement information of the first reference signal, and the second measurement information is measurement information of the second reference signal. The network device may determine an antenna weight based on the first measurement information and the second measurement information.