Dynamic TRS Scheduling for 3GPP NR Collision Avoidance
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Solution Overview
Problem
In 3GPP New Radio (NR) systems, time domain collisions occur between Tracking Reference Signals (TRS) and Physical Downlink Shared Channels (PDSCH) due to overlapping transmission scheduling, leading to inefficiencies in beam management and synchronization.
Innovation Solution
A radio access network element and user equipment are configured to detect time domain collisions and adjust transmission scheduling by omitting or puncturing TRS and PDSCH transmissions, based on quasi co-location and Hybrid Automatic Repeat Request (HARQ) status, to avoid collisions and optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tracking reference signal and shared data channel are transmitted simultaneously in overlapping time resources, then transmission efficiency is improved, but signal collision and interference occur
Solution Approach 1:
The patent implements dynamic scheduling that adapts TRS transmission based on PDSCH scheduling decisions. When PDSCH is scheduled in a slot, the gNB dynamically adjusts or omits TRS transmission in that same slot, preventing collisions while maintaining synchronization capability when PDSCH is not transmitted.
Solution Approach 2:
The gNB performs preliminary detection of potential time domain collisions between TRS and PDSCH before transmission. By detecting overlapping time resources in advance, the system can proactively adjust scheduling decisions to prevent signal interference before it occurs.
2Measurement precision
If tracking reference signal transmission is maintained continuously, then time and frequency synchronization is improved, but transmission overhead increases
Solution Approach 1:
Instead of continuous TRS transmission, the system employs periodic transmission where TRS is sent only in slots where PDSCH is not scheduled. This periodic approach maintains necessary synchronization functionality while significantly reducing transmission overhead by eliminating redundant TRS transmissions in slots dedicated to data transmission.
Solution Approach 2:
The system dynamically changes the transmission parameter of TRS based on scheduling conditions. When PDSCH is scheduled, TRS transmission is adjusted or omitted; when PDSCH is not scheduled, TRS transmission proceeds as normal. This parameter adaptation optimizes the balance between synchronization accuracy and resource efficiency.
3Productivity
If shared data channel is prioritized over tracking reference signal during collision, then data transmission efficiency is improved, but synchronization performance deteriorates
Solution Approach 1:
The patent implements dynamic priority adjustment based on traffic conditions and scheduling requirements. Rather than fixed priority, the system adaptively determines whether to transmit TRS or PDSCH in conflicting slots, allowing optimization of both data transmission efficiency and synchronization performance based on real-time network conditions.
Data Source
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AI summary
When a time domain collision between Tracking Reference Signal (TRS) symbols and downlink shared data channel symbols is detected, the TRS symbols may be multiplexed with the downlink shared data channel symbols from multiple Transmission Reception Points (TRPs)not sharing quasi co-location (QCL) parameters with each other. If a time domain collision between TRS symbols and dynamically or semi-static (e.g., persistent) downlink shared data channel transmissions is detected, transmission and/or reception of the TRS and/or the downlink shared data channel may be adjusted.