Terminal Weight Matrix Estimation for Lower MIMO Signaling Overhead
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In MIMO systems, delivering precoding and detection matrices between network and terminal devices causes high signaling overheads, leading to reduced received signal-to-noise indicators due to interference elimination and power loss.
Innovation Solution
The terminal device determines an estimation result of the weight matrix U based on a reference signal, allowing it to perform signal detection or precoding without the need for additional signaling from the network device, reducing overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the network device delivers precoding matrix information to the terminal device, then interference between uplink data streams is eliminated, but signaling overhead increases
Solution Approach 1:
The patent extracts the essential information needed for precoding (channel state information and precoding matrix indicator) and transmits only this compressed representation rather than the complete precoding matrix. The terminal device then locally determines the precoding matrix based on this extracted information, eliminating the need to transmit the full matrix and reducing signaling overhead while still enabling interference elimination.
Solution Approach 2:
Instead of the network device determining and delivering the precoding matrix to the terminal device (conventional approach), the patent inverts the process by having the terminal device autonomously determine the precoding matrix based on channel state information and PMI feedback. This role reversal reduces the signaling burden on the network while maintaining precoding performance.
2Object-generated harmful factors
If the network device delivers detection matrix information to the terminal device, then interference between downlink data streams is eliminated, but signaling overhead increases
Solution Approach 1:
The patent extracts essential detection information (channel state information and precoding matrix indicator) and transmits this compressed representation to the terminal device. The terminal device then locally determines the detection matrix based on this extracted information, eliminating the need to transmit the full detection matrix and reducing signaling overhead while maintaining interference elimination capability.
Solution Approach 2:
The terminal device performs self-service by autonomously determining its own detection matrix based on received channel state information and PMI feedback, rather than relying on the network device to provide the complete detection matrix. This self-determination capability reduces signaling overhead while enabling the terminal to eliminate interference between downlink data streams.
3Measurement precision
If precoding matrix is at subband or RB level, then interference elimination precision is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the frequency spectrum into subbands or resource blocks and applies precoding/detection matrices independently to each segment. This segmentation enables precise interference elimination at the subband level while the terminal device autonomously determines the matrices for each segment based on local channel measurements, avoiding the need for extensive network-delivered signaling for each subband.
Solution Approach 2:
The patent transitions from time-domain precoding to frequency-domain precoding by applying different precoding matrices to different subbands or resource blocks. This dimensional change in the frequency domain enables precise interference elimination tailored to each frequency segment's channel conditions, while the terminal's autonomous determination capability keeps signaling overhead manageable.
Data Source
AI summary
Example communication methods and apparatus are described. One example method includes receiving a reference signal from a network device by a terminal device. The reference signal has an association relationship with a weight matrix and a channel between the network device and the terminal device, a quantity of rows or columns of the weight matrix is N, and N is a positive integer less than or equal to a quantity of receive ports of the terminal device. The terminal device determines an estimation result of the weight matrix based on the reference signal, where the estimation result of the weight matrix is used by the terminal device to perform signal detection on a data signal received by the terminal device from the network device, or is used by the terminal device to precode a data signal sent by the terminal device to the network device.