Sidelink Rate-Matching Around Reference Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sidelink communication technologies in wireless systems, such as 5G NR, face limitations in resource management and channel state information reporting, leading to inefficiencies in device-to-device communication, particularly in scenarios like vehicle-to-everything (V2X) applications, where independent bandwidth and transmission independence are required.
Innovation Solution
The implementation of a method where User Equipments (UEs) can configure and transmit standalone sidelink reference signals (SL-RS) independently of physical sidelink shared channels, allowing for rate-matching and resource selection based on physical sidelink feedback channels, enabling UEs to support various sidelink features like zero power CSI-RS, non-zero power CSI-RS, and interference measurement signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standalone SL-RS is configured independent of PSSCH, then resource management flexibility and channel state information reporting capability are improved, but device complexity and configuration overhead increase
Solution Approach 1:
The patent segments the sidelink communication resources by introducing standalone SL-RS that are independently configurable from PSSCH. This allows separate resource pools for reference signals and data channels, enabling independent optimization of channel state information reporting and data transmission resources, thereby improving resource management flexibility without requiring complete reconfiguration of the entire sidelink system.
Solution Approach 2:
The patent implements dynamic resource allocation where SL-RS resources can be independently configured, activated, and adapted based on channel conditions and traffic requirements. The gNB can dynamically adjust SL-RS resource pools, transmission periodicity, and bandwidth independently of PSSCH configurations, allowing the system to adapt to varying operational conditions while maintaining manageable complexity through standardized procedures.
2Measurement precision
If SL-RS transmission is independent of PSSCH, then channel state information accuracy is improved, but transmission overhead and resource consumption increase
Solution Approach 1:
The patent applies local quality by configuring SL-RS with specific properties tailored to channel measurement requirements in particular resource pools or geographic areas. Different SL-RS configurations (e.g., CSI-RS, SRS, PRS) can be deployed with appropriate bandwidth, periodicity, and power settings localized to specific sidelink scenarios, improving CSI accuracy where needed while avoiding unnecessary overhead in other regions or time periods.
Solution Approach 2:
The patent utilizes parameter changes by allowing dynamic adjustment of SL-RS characteristics such as bandwidth, periodicity, power spectral density, and resource allocation patterns. These parameters can be modified based on channel conditions, traffic load, and interference levels, enabling the system to optimize the balance between measurement precision and transmission overhead for different operational scenarios.
3Productivity
If rate-matching is performed around SL-RS and PSFCH, then resource allocation efficiency is improved, but processing complexity and computational load increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring rate-matching patterns and resource allocation rules around SL-RS and PSFCH positions. The gNB provides upfront indications to UEs about where SL-RS and PSFCH will be transmitted, allowing UEs to pre-calculate rate-matching patterns and prepare resource allocation in advance, thereby improving resource allocation efficiency while reducing real-time processing complexity during actual transmission.
Data Source
AI summary
The apparatus may include a base station and UEs configured to communicate via sidelink communication. The UEs may select transmission resources from a resource pool including first periodic resources for PSFCH and second periodic resources for SL-RS, and rate-match the PSSCH around at least one of the first period resources or the second period resources. The second periodic resources may be shifted in time or canceled based on the first periodic resources. The base station may configure the UEs based on the UEs' capabilities to support the SL-RS and rate-matching the PSSCH around the multiplexed SL-RS and PSFCH.