Reference Signal Tracking With Time-Domain Rotation in Multi-TRP Links
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively tracking reference signals in overlapping time resources, particularly in multi-TRP configurations, which can lead to interference and reduced communication efficiency.
Innovation Solution
The implementation of time-domain rotation coefficients and reference signals (RSs) in overlapping time resources, allowing UEs and network nodes to communicate with multiple transmission reception points (TRPs) by applying these coefficients, enabling efficient tracking and channel property measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reference signals are transmitted in overlapping time resources from multiple TRPs, then communication efficiency is improved through better resource utilization, but interference increases and signal tracking becomes difficult
Solution Approach 1:
The patent applies time-domain rotation coefficients that modify the time-domain characteristics of reference signals from different TRPs. By changing the temporal parameters (rotation angles and coefficients) of the signals, the system enables differentiation between overlapping signals from multiple TRPs, reducing interference while maintaining efficient resource utilization.
Solution Approach 2:
The time-domain rotation coefficients act as an intermediary mechanism between multiple TRPs and the UE. These coefficients mediate the interaction by introducing distinct temporal signatures to each TRP's reference signal, allowing the UE to separate and track signals from different TRPs even when transmitted in overlapping time resources.
2Quantity of substance
If multiple TRPs transmit reference signals in overlapping time resources, then resource utilization is improved, but measurement precision deteriorates due to signal interference
Solution Approach 1:
The patent modifies the time-domain parameters of reference signals by applying rotation coefficients specific to each TRP. This parameter change enables the UE to distinguish between signals from different TRPs based on their unique temporal characteristics, thereby maintaining measurement precision while improving resource utilization through overlapping transmissions.
Solution Approach 2:
Each TRP's reference signal is assigned local quality in the form of unique time-domain rotation coefficients. This differentiation allows the UE to perform precise channel property measurements for each TRP individually, even when signals overlap in time, by exploiting the distinct temporal signatures imposed on each signal.
3Reliability
If time-domain rotation coefficients are applied to reference signals, then signal tracking is improved in multi-TRP environments, but device complexity increases
Solution Approach 1:
The patent employs time-domain rotation coefficients that modify reference signals in a mathematically tractable way. The UE can track signals from multiple TRPs by applying inverse rotations based on known coefficients, improving tracking reliability while keeping processing complexity manageable through efficient algorithmic implementation.
Solution Approach 2:
The system uses feedback mechanisms where the network node provides indication information about the time-domain rotation coefficients to the UE. This feedback enables the UE to correctly interpret and track the rotated signals without requiring complex blind detection, thereby improving reliability while controlling processing complexity.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of a set of time-domain rotation coefficients associated with a set of transmission reception points (TRPs) through which the UE communicates with a network node. The UE may receive a set of reference signals (RSS) from the set of TRPs in overlapping time resources, the set of RSs having the set of time-domain rotation coefficients applied. The UE may transmit an indication of time-domain channel properties (TDCPs) associated with TRPs of the set of TRPs. Numerous other aspects are described.