PTRS Frequency Density Decoupling for Subband LBT Reliability
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Solution Overview
Problem
In wireless communication systems, particularly in NR systems employing Subband LBT, there is uncertainty regarding the actually occupied bandwidth, which complicates the design of Phase-Tracking Reference Signals (PTRS), leading to potential transmission reliability issues due to varying Subband LBT results.
Innovation Solution
A method where N radio signals are operated in N time-frequency resource blocks, with frequency density of PTRS only related to the target time-frequency resource block, independent of the actually occupied bandwidth or Subband LBT results, ensuring consistent interpretation and transmission reliability across different Subband LBT scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Subband LBT is adopted in NR system, then channel access chance is improved, but resource occupation uncertainty increases
Solution Approach 1:
The patent segments the bandwidth into multiple subbands (e.g., 5 subbands of 20 MHz each for a 100 MHz carrier) and performs LBT independently on each subband. This allows the system to access channels in a segmented manner, improving the chance of successful access while maintaining clear knowledge of which specific subbands are occupied, thereby resolving the contradiction between access probability and resource occupation certainty.
2Measurement precision
If PTRS frequency density is determined based on scheduled bandwidth, then channel estimation precision is improved, but transmission reliability deteriorates under Subband LBT uncertainty
Solution Approach 1:
The patent dynamically determines the PTRS frequency density based on the actual occupied bandwidth identified through Subband LBT results rather than using a fixed scheduled bandwidth. The system adapts the PTRS configuration according to the actual channel access outcome, ensuring optimal channel estimation precision while maintaining transmission reliability under varying LBT conditions.
Solution Approach 2:
The patent implements feedback mechanisms where the base station reports the actual occupied bandwidth information to the UE based on Subband LBT results. This feedback allows the UE to adjust its PTRS expectations and channel estimation parameters accordingly, ensuring reliable transmission despite the uncertainty introduced by Subband LBT.
Data Source
AI summary
The present disclosure provides method and device used in UE and base station for wireless communication. A UE receives a first signaling and then operates N radio signals respectively in N time-frequency resource blocks. The first signaling indicates N1 time-frequency resource blocks; the N1 time-frequency resource blocks respectively belong to N1 frequency sub-bands in frequency domain; any of the N time-frequency resource blocks is one of the N1 time-frequency resource blocks, N being a positive integer greater than 1 and no greater than N1; the N radio signals respectively comprise N first-type reference signals, and an antenna port for transmitting each of the N first-type reference signals is associated with a first antenna port.