Terminal Device Assistance Control Information Interference Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, the limited amount of feedback information restricts the precision of channel state information, leading to suboptimal precoding and reduced spectral efficiency due to insufficient suppression of inter-user and intercell interference.
Innovation Solution
The system employs a terminal device and base station apparatus that utilize assistance control information, including demodulation and channel estimation parameters, to enhance channel state estimation and precoding, allowing for improved interference suppression and spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of quantized bits of channel state information is increased to improve precoding precision, then interference suppression performance is improved, but the amount of feedback information increases
Solution Approach 1:
The patent segments control information into two distinct parts: demodulation control information for the serving cell and assistance control information for neighboring cells. This segmentation allows the terminal to provide targeted channel state information for interference suppression without requiring complete channel information for all cells, thereby reducing overall feedback overhead while maintaining precoding precision where it matters most.
Solution Approach 2:
The patent introduces an intermediary mechanism where the base station requests specific assistance control information from the terminal based on its interference suppression needs. The terminal acts as an intermediary that selectively provides channel state information for neighboring cells rather than all possible cells, enabling the base station to perform coordinated beamforming with sufficient information while minimizing feedback burden.
2Productivity
If assistance control information for neighboring cells is provided to improve intercell interference suppression, then spectral efficiency is improved, but terminal processing complexity increases
Solution Approach 1:
The patent applies local quality by having the terminal calculate and provide assistance control information only for specific neighboring cells that are relevant for interference suppression, rather than computing channel state information for all possible neighboring cells. The base station identifies which neighboring cells pose interference threats and requests information only for those, reducing terminal processing complexity while maintaining spectral efficiency.
Solution Approach 2:
The patent implements partial action where the terminal provides assistance control information for a subset of neighboring cells rather than all neighboring cells. The base station determines the minimum necessary set of neighboring cell information required for effective coordinated beamforming, allowing the terminal to perform partial calculations that balance processing complexity with spectral efficiency improvement.
3Object-affected harmful factors
If transmission precoding with high interference suppression is implemented, then inter-user interference is reduced, but the amount of required channel state information increases
Solution Approach 1:
The patent applies preliminary action by having the terminal pre-calculate assistance control information for neighboring cells based on downlink reference signals before the actual data transmission. The base station uses this pre-prepared information to perform coordinated beamforming and suppress inter-user interference, eliminating the need for real-time calculation of complete channel state information and reducing the effective information burden.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A terminal device according to an aspect of the present invention includes a reception module that receives a control channel and a spatially multiplexed data signal channel, a control signal detection module that extracts, from an output from the reception module, a demodulation control information which is a transmission parameter of a signal that is transmitted to the terminal device, in a data signal channel that is output from the reception module, and assistance control information which is a transmission parameter of a signal that is transmitted to a different terminal device, in the data signal channel that is output from the reception module, a channel estimator that obtains a channel estimate by using a reference signal, a signal detection module that demultiplexes the data signal channel by using the demodulation control information, the assistance control information, and the channel estimate, and a decoding module that decodes a signal that is output by the signal detection module, in which information indicating a rank is included in the assistance control information.