Configured Chase-Combining Reception for NR Sidelink Mode 1
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Solution Overview
Problem
Current wireless communication systems face challenges in decoding sidelink control information (SCI) messages due to interference and poor signal quality, especially in scenarios where direct control of the receiving UE is not possible, leading to difficulties in maintaining reliable sidelink links.
Innovation Solution
The implementation of configured reception with SCI repetition over a sidelink, where the receiving UE is scheduled to receive and combine multiple repetitions of the SCI message across pre-defined time-frequency slots, enabling improved decoding of the SCI and subsequent data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SCI message transmission uses traditional methods without repetition, then transmission complexity is low, but decoding reliability deteriorates due to interference and poor signal quality
Solution Approach 1:
The transmitting UE sends periodic repetitions of the SCI message at predetermined intervals across multiple slots. The receiving UE is configured to monitor these periodic opportunities and combine the repeated messages, improving decoding reliability through temporal diversity while maintaining manageable reception complexity through pre-configuration.
Solution Approach 2:
The receiving UE is pre-configured with reception occasions and parameters before actual SCI transmission occurs. This preliminary configuration enables the UE to efficiently monitor and combine repeated SCI messages without requiring complex real-time decision-making, thus improving reliability while controlling reception complexity.
2Measurement precision
If multiple SCI repetitions are transmitted across multiple slots, then decoding accuracy is improved through combining, but transmission time increases
Solution Approach 1:
SCI messages are transmitted periodically at predetermined intervals rather than continuously. This allows the receiving UE to combine multiple repetitions over time, improving decoding accuracy through enhanced signal accumulation, while the periodic nature limits the total time required compared to continuous transmission attempts.
Solution Approach 2:
The system uses self-service mechanisms where the receiving UE automatically combines received SCI repetitions without requiring external coordination or additional processing time. The pre-configured reception parameters enable the UE to efficiently accumulate and decode repeated messages, achieving high decoding accuracy within minimal time overhead.
3Reliability
If configured reception with SCI repetition is implemented, then sidelink link reliability is maintained in challenging environments, but system complexity increases
Solution Approach 1:
The receiving UE receives pre-configuration parameters from the transmitting UE or network before SCI transmission begins. This preliminary setup includes reception occasions, timing information, and combining parameters, which enables the UE to maintain reliable sidelink connections in challenging environments without requiring complex real-time processing or coordination during actual transmission.
Solution Approach 2:
The patent introduces an intermediary configuration mechanism where reception parameters are established in advance through signaling between transmitting and receiving UEs or through network configuration. This intermediary step simplifies the actual reception process by providing pre-defined parameters, thereby maintaining link reliability while controlling overall system complexity.
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that support configured reception with sidelink control information (SCI) repetition over a sidelink. In aspects, a receiving user equipment (UE) may be configured to conduct combined reception/decoding of SCI repetitions (received from a transmitting UE over a sidelink) over multiple time-frequency slots at pre-defined occasions (e.g., occasions configured by a base station) to decode a sidelink transmission. In aspects, a receiving UE may receive from a transmitting UE over a sidelink, a sidelink transmission during a reception occasion that includes a plurality of reception opportunities for the receiving UE. Each reception opportunity of the plurality of reception opportunities includes a repetition of an SCI. The receiving UE decodes the SCI by combining the repetitions of the SCI received in one or more reception opportunities, and decodes a data transmission (e.g., a physical sidelink shared channel (PSSCH) transmission) using the decoded SCI.