Interference Cancellation Using Assisted Modulation Limits
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Solution Overview
Problem
In wireless communication systems, especially in MIMO configurations, there is a challenge in effectively canceling interference signals from neighboring base stations to improve signal reception and data transmission efficiency, particularly for user equipment with multiple antennas, where existing methods require complex interference parameter detection and signaling overhead.
Innovation Solution
The user equipment receives assistance information to limit the number of interference layers or modulation orders, and assumes these values to cancel interference signals, simplifying the interference cancellation process by restricting the number of interference layers or modulation orders based on the number of receiving antennas and desired signal layers, thereby reducing the need for extensive blind detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the user equipment performs blind detection to determine the number of interference layers and modulation orders, then the interference cancellation accuracy is improved, but the detection complexity and processing time increase
Solution Approach 1:
The base station performs preliminary action by determining the number of interference layers and modulation orders before data transmission, and notifies the user equipment through assistance information. This eliminates the need for user equipment to perform complex blind detection, resolving the contradiction between detection accuracy and complexity.
2Reliability
If the base station transmits detailed interference information to user equipment, then the interference cancellation performance is improved, but the signaling overhead increases
Solution Approach 1:
The base station extracts only the essential interference parameters (number of interference layers and modulation orders) needed for effective interference cancellation, and transmits them through assistance information. This selective extraction maintains cancellation performance while minimizing signaling overhead.
3Ease of operation
If the user equipment assumes limited values for interference parameters, then the processing complexity is reduced, but the interference cancellation accuracy may deteriorate
Solution Approach 1:
The base station performs preliminary determination of the exact interference parameters and communicates them to the user equipment through assistance information. This allows the user equipment to use accurate values rather than assuming limited values, maintaining high cancellation accuracy while simplifying processing.
Data Source
AI summary
A method for cancelling interference and receiving a signal by a user equipment in a wireless communication system, the method includes identifying assistance information for cancelling an interference signal transmitted from an interfering base station; cancelling the interference signal based on the assistance information; and receiving a desired signal from a serving base station, wherein the user equipment assumes a part of the assistance information for cancelling the interference signal as a limited value and then receives the interference signal, and wherein a modulation order of the interference signal as the part of the assistance information is smaller than or equal to a specific value as the limited value.