Variable Tracking Reference Signal Density for Wireless Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in ensuring that timing and frequency errors between user equipment (UE) and base stations (BS) are within the pull-in range of tracking reference signals (TRS), leading to failed signal decoding and increased power consumption due to subcarrier spacing discrepancies between synchronization signal blocks (SSB) and physical downlink shared channels (PDSCH).
Innovation Solution
The method involves varying the density and symbol spacing of TRS based on the subcarrier spacing of SSB and PDSCH to ensure that timing and frequency errors after SSB correction fall within the TRS pull-in range, allowing for accurate signal refinement and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed density TRS is used, then implementation is simple, but timing and frequency errors may fall outside pull-in range leading to decoding failure
Solution Approach 1:
The patent applies dynamics by making the TRS density variable rather than fixed. The TRS density is dynamically adjusted based on the ratio between SSB subcarrier spacing and PDSCH subcarrier spacing, allowing the system to adapt to different synchronization and data channel configurations while maintaining reliable signal decoding.
Solution Approach 2:
The patent changes the parameter of TRS density based on the subcarrier spacing ratio. By calculating the ratio between SSB subcarrier spacing and PDSCH subcarrier spacing, the system determines the appropriate TRS density to ensure timing and frequency errors remain within the pull-in range, thereby improving decoding success without excessive complexity.
2Reliability
If TRS density is increased to ensure errors are within pull-in range, then decoding reliability improves, but power consumption increases
Solution Approach 1:
The patent optimizes the TRS density parameter based on the subcarrier spacing ratio, avoiding unnecessary increases in TRS transmission. By calculating the appropriate density required to keep timing and frequency errors within the pull-in range, the system maintains decoding reliability while minimizing UE power consumption compared to using a consistently high TRS density.
3Reliability
If variable TRS density based on SSB and PDSCH subcarrier spacing is used, then decoding reliability and power efficiency improve, but configuration complexity increases
Solution Approach 1:
The patent establishes a systematic parameter change rule where TRS density is determined by the ratio of SSB subcarrier spacing to PDSCH subcarrier spacing. This provides a clear, calculable method for configuring variable TRS density that improves reliability and power efficiency while keeping the configuration process manageable through a defined mathematical relationship.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for receiving an indication of variable tracking reference signal (TRS). A method that may be performed by a user equipment (UE) includes determining a configuration indicating a value for a variable tracking reference signal (TRS) density, monitoring for TRSs from a base station (BS) according to the indicated value for the variable TRS density, and performing at least one of frequency tracking or timing tracking based on the monitoring.