Receiver FFT Timing for Multi-TRP Wireless Systems
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Solution Overview
Problem
In wireless communications, determining receiver FFT timing for downlink transmissions is inefficient when multiple transmission/reception points (TRPs) transmit concurrently, as existing techniques may produce inaccurate results by considering only single quasi-co-location (QCL) relationships, leading to delayed FFT processing and potential errors.
Innovation Solution
A method and apparatus for a user equipment (UE) to determine receiver FFT timing by identifying transmission configuration states, detecting first arrival paths of reference signals, and combining power delay profiles to derive a default or composite timing, even in multi-TRP scenarios, allowing for concurrent processing of downlink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing techniques determine receiver FFT timing by considering only single QCL relationships, then the timing determination process is simple, but the accuracy of timing determination deteriorates in multi-TRP scenarios
Solution Approach 1:
The patent segments the timing determination process by identifying multiple first arrival paths (FAPs) corresponding to different transmission configuration states and different TRPs. Instead of treating timing determination as a single process, it divides it into multiple FAP detections, each associated with a specific QCL relationship and TRP, allowing accurate timing selection in multi-TRP scenarios
Solution Approach 2:
The patent performs preliminary detection of multiple first arrival paths (FAPs) from different TRPs before final timing determination. By pre-identifying FAPs associated with different transmission configuration states and QCL relationships, the system prepares timing candidates in advance, enabling accurate and efficient FFT timing selection without waiting for control channel decoding
2Measurement precision
If the UE waits to determine receiver timing after decoding control channels, then timing can be accurately aligned with TRP transmissions, but processing delay increases
Solution Approach 1:
The patent performs preliminary detection of first arrival paths (FAPs) and determination of receiver timing before decoding control channels. By pre-identifying FAPs associated with different transmission configuration states and determining timing based on these FAPs, the system enables earlier FFT processing without waiting for control channel decoding, thereby reducing processing delay while maintaining timing accuracy
Solution Approach 2:
The UE autonomously determines receiver timing by detecting FAPs of reference signals associated with different QCL relationships, without requiring control channel decoding. This self-service approach allows the UE to independently establish timing based on physical layer measurements, eliminating the sequential dependency on control channel processing
3Adaptability or versatility
If the system supports multiple transmission configuration states for multi-TRP transmissions, then the system can handle concurrent transmissions from multiple TRPs, but the complexity of managing different QCL relationships increases
Solution Approach 1:
The patent segments QCL relationship management by associating each transmission configuration state with a specific FAP and TRP. Instead of managing all QCL relationships simultaneously, the system divides them into discrete segments, each tied to a specific transmission configuration state, making it easier to track and manage multiple QCL relationships in multi-TRP scenarios
Solution Approach 2:
The patent introduces FAP detection as an intermediary mechanism between multiple TRPs and the UE. By using FAPs as intermediaries that represent each TRP's timing characteristics, the system simplifies the management of multiple QCL relationships, as each FAP serves as a representative marker for its associated TRP and transmission configuration state
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive signaling, such as a downlink control information (DCI), that identifies a transmission configuration state from a set of transmission configuration states, from which the UE may determine a receiver timing. The UE may then receive a downlink transmission, such as a physical downlink shared channel (PDSCH), from one or more transmission/reception points (TRPs). The UE may use the receiver timing to decode the downlink transmission by performing a fast fourier transform (FFT) with the receiver timing for the downlink transmission.