Delay Pre-Compensation for Distributed TRP Synchronization
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Solution Overview
Problem
In distributed multiple-input multiple-output (MIMO) wireless communication systems, there is a challenge in managing delay differences between transmissions from various transmission and reception points (TRPs), leading to potential inter-symbol interference due to large delay spreads exceeding the cyclic prefix duration.
Innovation Solution
The system employs delay pre-compensation by measuring and reporting delay metrics from user equipment (UE) to network entities, allowing TRPs to adjust their transmission timing to synchronize downlink transmissions, thereby reducing delay differences and minimizing inter-symbol interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distributed TRPs transmit simultaneously without delay compensation, then transmission simplicity is maintained, but delay spread exceeds cyclic prefix duration causing inter-symbol interference
Solution Approach 1:
The patent applies preliminary action by having the network entity obtain delay metrics from the UE before performing delay pre-compensation on downlink transmissions. The network entity calculates delay differences based on these metrics and adjusts transmission timing in advance, ensuring that delay spreads are compensated before transmissions occur, thereby preventing inter-symbol interference while maintaining coordinated operation across distributed TRPs
2Reliability
If delay pre-compensation is implemented, then delay spread is reduced within cyclic prefix duration, but measurement and coordination overhead increases
Solution Approach 1:
The patent implements feedback by having the UE measure downlink reference signals from multiple TRPs and generate delay metrics that are reported back to the network entity. This feedback mechanism enables the network entity to obtain accurate delay information from the UE, which is then used to perform precise delay pre-compensation, ensuring reliable communication while managing the time overhead through efficient measurement and reporting procedures
3Manufacturing precision
If delay metrics are obtained from UE measurements, then transmission synchronization accuracy is improved, but UE measurement and reporting burden increases
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously measure downlink reference signals from multiple TRPs and generate delay metrics without requiring complex network-side coordination for the measurement process itself. The UE independently performs the measurements and calculations, reducing the processing burden on the network entity while still providing accurate delay information for synchronization, thereby improving timing precision without excessive complexity
Data Source
AI summary
A network entity can provide a plurality of downlink (DL) transmissions using a plurality of distributed transmission and reception points (TRPs) in a multiple-in-multiple-out (MIMO) system. The network entity can obtain delay metrics of the DL transmissions from the UE. The UE can generate the delay metrics based on measurements of DL reference signals from the distributed TRPs. The network entity can pre-compensate the DL transmissions based on the delay metrics.