Base Station MUST Information for Interference Cancellation
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Solution Overview
Problem
In communication systems like LTE, terminal devices face challenges in learning interference signal information and reducing inter-user interference, requiring accurate channel information reporting from terminals to base stations for effective interference cancellation.
Innovation Solution
A base station device transmits Multiuser Superposition Transmission (MUST) information to terminal devices, including combinations of modulation schemes and power ratios, allowing terminals to determine and cancel interference, enhancing throughput and communication opportunities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple terminal devices are non-orthogonally multiplexed to perform transmission, then system capacity and communication opportunity are enhanced, but inter-user interference is caused
Solution Approach 1:
The patent converts the harmful inter-user interference into a beneficial signal by having the terminal device demodulate and decode the interference signal to extract interference signal information, then use this information to cancel the interference. The interference signal that was originally harmful is transformed into useful interference signal information for cancellation purposes.
Solution Approach 2:
The base station device transmits MUST information including modulation schemes and power ratios to the terminal device in advance before the actual data transmission. This preliminary provision of interference signal information enables the terminal device to prepare for interference cancellation ahead of time, improving the efficiency of the cancellation process.
2Object-generated harmful factors
If terminal device learns interference signal information to cancel interference, then interference is reduced, but terminal device complexity increases
Solution Approach 1:
The terminal device performs self-service by autonomously demodulating and decoding the interference signal using the provided MUST information to extract interference signal information. This self-service approach eliminates the need for complex external interference cancellation systems while enabling the terminal to handle interference independently.
Solution Approach 2:
The base station device provides a copy of the interference signal characteristics through MUST information (modulation schemes and power ratios), which the terminal device uses to create a replica of the interference signal for cancellation purposes. This copying approach simplifies the terminal device by avoiding the need to directly analyze and replicate complex interference patterns.
3Productivity
If base station determines terminal for non-orthogonal multiplexing, then communication opportunity is enhanced, but channel information reporting requirement increases
Solution Approach 1:
The patent extracts only the essential MUST information (modulation schemes and power ratios) from the complete channel information that would otherwise need to be reported. By taking out only the necessary interference signal parameters, the system reduces the amount of channel information that needs to be reported while still enabling effective interference cancellation.
Data Source
AI summary
The present invention provides a base station device, a terminal device, and a communication method, where the terminal efficiently learns information of an interference signal and reduces interference in a reception process to make it possible to enhance throughput, enhance communication opportunity of each terminal device by feedback from the terminal, and the like. The base station device includes a transmission unit configured to transmit, to the terminal device, Multiuser Superposition Transmission (MUST) information used for canceling interference due to MUST. The MUST information includes multiple combinations of modulation schemes for the MUST, and a list of power ratios used for the MUST in each of the combinations of the modulation schemes.