MUST Downlink Control Signal Interference Cancellation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting control information for Multi-User Superposition Transmission (MUST) due to limitations in existing technologies, particularly in managing interference signals and resource allocation, which affect data transmission rates and reliability.
Innovation Solution
A method and device for a UE to receive downlink signals from an eNB by acquiring information for both downlink data and interference signals when a MUST application indicator is present, allowing for improved interference cancellation and resource management, including modulation order, transport block size, power information, and precoder alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple users share the same frequency-time resources through MUST, then resource utilization efficiency is improved, but interference between users increases
Solution Approach 1:
The patent applies interference cancellation techniques to convert the harmful interference caused by MUST into a benefit. By acquiring interference signal information (modulation order, resource allocation, power information) and performing interference cancellation at the receiver, the system eliminates the negative impact of multi-user interference while maintaining the high resource utilization efficiency of MUST
Solution Approach 2:
The patent introduces an intermediary mechanism by transmitting specific control information about interference signals through downlink control signals. This intermediary information (including modulation order, resource allocation, and power information of interference signals) enables the receiver to accurately identify and cancel interference without requiring direct user-to-user coordination
2Reliability
If control information for interference signals is transmitted, then interference cancellation performance is improved, but downlink control signal overhead increases
Solution Approach 1:
The patent makes the downlink control signal multi-functional by embedding both user-specific data transmission information and interference signal information in the same control structure. The control signal simultaneously serves to schedule the user's own data transmission and provide interference cancellation parameters, thereby improving interference cancellation performance without proportionally increasing overhead
Solution Approach 2:
The patent changes the parameter structure of control information by selectively including interference signal parameters (modulation order, resource allocation, power information) only when MUST is applied. This conditional parameter inclusion optimizes the balance between interference cancellation performance and control signal overhead by adapting the information content to the actual transmission scenario
Data Source
AI summary
The present application provides a method for receiving a downlink signal from a base station by a terminal in a wireless communication system. Specifically, the method comprises: when a downlink control signal from the base station includes a multi-user superposition transmission (MUST) application indicator, acquiring information for an interference signal and information for a downlink data signal included in the downlink control signal; and receiving the downlink data signal on the basis of the information for the downlink data signal and the information for the interference signal.