Sidelink Active Interference Cancellation for Signal Decoding
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing interference due to frequency sidelobes during sidelink transmissions, particularly in high-velocity scenarios, leading to synchronization errors and interference among devices.
Innovation Solution
Implementing active interference cancellation (AIC) techniques by network entities transmitting scheduling information and AIC parameters to UEs, enabling UEs to apply AIC during sidelink transmissions, and modifying interference at the receiver to decode signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AIC is applied to sidelink transmissions, then interference is reduced and signal decoding efficiency is improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent introduces an intermediary AIC signal that acts as a mediator between the interfering sidelink transmission and the affected transmission. This AIC signal carries interference cancellation information that enables the receiver to subtract the interfering signal components, thereby reducing interference without requiring complex processing at the transmitter side. The intermediary signal bridges the gap between simple transmission and complex interference cancellation.
Solution Approach 2:
The AIC parameters are determined and transmitted in advance before the actual sidelink transmission occurs. The network entity pre-calculates the AIC parameters based on scheduling information and transmits them to the UE via control messages. This preliminary action allows the receiver to be prepared with the necessary interference cancellation information before the interfering signal is transmitted, simplifying the real-time processing requirements.
2Reliability
If AIC parameters are transmitted via control messages, then interference cancellation is enabled, but network signaling overhead increases
Solution Approach 1:
The AIC parameters are transmitted using existing control message structures that are already part of the scheduling information framework. By reusing the same control channel and message formats that carry scheduling information, the patent enables multi-functionality where the control messages serve both scheduling and AIC parameter transmission purposes. This approach avoids creating entirely new signaling mechanisms and leverages existing infrastructure.
Solution Approach 2:
The patent combines the transmission of scheduling information and AIC parameters into a single control message flow. Instead of separate signaling channels for scheduling and AIC parameters, the solution merges these functions into unified control messages that carry both types of information. This consolidation reduces the total number of separate control transmissions and optimizes network signaling efficiency.
3Reliability
If AIC is performed with multiple parameters (optimization area, time resource, frequency resource, subcarriers, pattern), then interference cancellation performance is improved, but processing complexity and time increase
Solution Approach 1:
The patent implements a hierarchical approach where a subset of AIC parameters is applied based on the specific interference scenario. Not all AIC parameters are always activated; instead, the system selectively applies only the necessary parameters required for the current interference condition. This partial action approach achieves sufficient interference cancellation performance without the full processing burden of all parameters, thereby reducing processing time while maintaining effectiveness.
Solution Approach 2:
Multiple AIC parameters are determined and configured in advance by the network entity before the actual transmission occurs. The optimization area, time resources, frequency resources, subcarrier patterns, and other parameters are pre-calculated and included in the control messages. This preliminary determination of multiple parameters allows the UE to receive ready-to-use configuration information, eliminating the need for real-time calculation and reducing processing time during actual transmission.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A network entity may transmit one or more control messages including scheduling information for a sidelink transmission and active interference cancellation (AIC) parameters to a transmitting user equipment (UE), a receiving UE, or both. The transmitting UE may relay the AIC parameters to the receiving UE. The transmitting UE may perform the sidelink transmission to a receiving UE. The transmitting UE may perform sidelink AIC on the sidelink transmission according to the AIC parameters. The receiving UE may decode the sidelink transmission by modifying interference at a receiver of the UE.