Sidelink Positioning Reference Signal Transmission Interference Avoidance
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Solution Overview
Problem
Current sidelink positioning reference signal (SL-PRS) transmission in 5G New Radio (NR) experiences significant interference due to the lack of network node scheduling, necessitating effective schemes to reduce interference during SL-PRS transmissions between user equipment (UEs).
Innovation Solution
A method where a transmitting UE (Tx UE) determines an SL-PRS configuration including resource reservation information and a sequence identifier, which is transmitted to receiving UEs (Rx UEs) via a higher layer message, either through a data channel or a control channel, to facilitate interference avoidance and resource management during SL-PRS transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SL-PRS transmission is performed without network node scheduling, then transmission flexibility and autonomy are improved, but interference and collision between transmissions increase
Solution Approach 1:
The transmitting UE performs sensing in a first time window before the actual SL-PRS transmission, and determines resource reservation information based on the sensing results. This preliminary action allows the UE to select interference-free resources in advance, thereby maintaining transmission flexibility while avoiding interference with other SL-PRS transmissions.
Solution Approach 2:
The system implements a feedback mechanism where the transmitting UE transmits resource reservation information to receiving UEs, and receiving UEs use this information to determine their own SL-PRS transmission resources. This feedback loop enables coordinated resource allocation among UEs, reducing interference while preserving autonomous transmission capability.
2Measurement precision
If resource reservation information is transmitted to enable interference avoidance, then measurement precision is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The resource reservation information is segmented into essential parameters that are transmitted through efficient signaling mechanisms. The configuration includes structured elements such as time resource indicators, frequency resource indicators, and periodicity parameters, organized in a standardized format that reduces parsing complexity while enabling precise resource identification for interference avoidance.
Data Source
AI summary
Various solutions for transmission of sidelink-positioning reference signal (SL-PRS) with respect to user equipment in mobile communications are described. Transmission user equipment (Tx UE) may determine an SL-PRS configuration. The SL-PRS configuration includes resource reservation information and a sequence identifier. Tx UE may transmit the SL-PRS configuration to at least one reception user equipment (Rx UE). The sequence identifier is transmitted through a data channel. The resource reservation information is transmitted through the data channel or a control channel.