Sidelink Interference Cancellation Through Inter-UE Coordination
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively canceling interference in sidelink communications, leading to decoding failures and reduced reliability and latency in UE communications.
Innovation Solution
UEs share inter-UE coordination information through sidelink assistance messages to mitigate interference, enabling successful decoding of sidelink transmissions by exchanging interference-related information and coordinating resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference cancellation techniques are implemented in sidelink communication, then decoding reliability is improved, but device complexity increases due to additional coordination messaging and interference management procedures
Solution Approach 1:
The patent introduces an intermediary coordination mechanism where UEs exchange assistance information messages containing interference-related data (such as resource allocation, modulation and coding scheme, and reference signal information). This intermediary information exchange enables receiving UEs to perform interference cancellation by reconstructing and subtracting interfering signals, thereby improving decoding reliability while managing complexity through standardized messaging procedures
Solution Approach 2:
The system performs preliminary actions by having transmitting UEs send assistance information messages before actual data transmission. These messages contain pre-configured interference cancellation parameters that receiving UEs can use to prepare for potential interference scenarios, enabling proactive interference management rather than reactive correction, thus improving reliability while distributing the complexity burden across multiple preparatory steps
2Reliability
If inter-UE coordination messages are exchanged for interference cancellation, then communication reliability is improved, but latency increases due to additional messaging overhead
Solution Approach 1:
The patent implements preliminary action by exchanging assistance information messages in advance of actual data transmission. These messages contain pre-configured parameters (resource allocation, MCS, reference signal patterns) that enable receiving UEs to prepare interference cancellation templates beforehand. When data transmission occurs, the pre-prepared information allows for faster interference mitigation, reducing the latency penalty associated with coordination messaging
Solution Approach 2:
The system employs periodic action through configured periodic transmissions of assistance information messages and scheduled retransmissions. By establishing periodic coordination patterns, the system creates predictable timing structures that allow UEs to buffer and process interference cancellation information efficiently, reducing random latency variations and enabling more deterministic communication timing
3Reliability
If comprehensive interference information is shared between UEs, then interference cancellation performance is improved, but energy consumption increases due to additional processing and transmission
Solution Approach 1:
The patent applies local quality by having UEs share only locally relevant interference information rather than comprehensive global information. Each UE transmits assistance information specific to its own transmissions and observed interference conditions (such as local resource allocations and detected interfering signals). This selective information sharing reduces the total volume of coordination messages and processing requirements compared to full-system information exchange, thereby reducing energy consumption while maintaining effective interference cancellation for local interference scenarios
Solution Approach 2:
The system implements partial action by exchanging a subset of interference-related information parameters rather than complete transmission details. The assistance information messages include only the most critical parameters needed for interference cancellation (such as resource allocation, MCS index, and reference signal configuration) while omitting less critical details. This partial information exchange achieves sufficient interference cancellation performance with reduced processing and transmission energy costs
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may generate sidelink assistance information based on an interference condition associated with an initial transmission of sidelink communication over a sidelink resource of a sidelink resource pool. The sidelink assistance information may include information associated with the interference condition. The UE may transmit an inter-UE coordination message including the generated sidelink assistance information. Additionally, or alternatively, a UE may receive inter-UE coordination message including sidelink assistance information. The UE may receive a retransmission of the sidelink communication and decode the received retransmission of the sidelink communication based on the received inter-UE coordination message including sidelink assistance information.