Time Domain Window for 5G Uplink Channel Estimation
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Solution Overview
Problem
Current 5G wireless systems face challenges in maintaining power consistency and phase continuity for joint channel estimation in uplink transmissions, particularly in low Signal-to-Noise Ratio (SNR) regimes, where channel estimation is a performance bottleneck, especially due to non-consecutive available slots and overlapping or canceled repetitions.
Innovation Solution
The implementation of a time domain window (TDW) mechanism for joint channel estimation, where the size of the TDW is configured by higher layers via radio resource control signaling, allowing for contiguous or non-contiguous windows based on specific conditions such as collisions, overlapping channels, or changes in frequency resources, to maintain phase and power consistency during PUSCH and PUCCH repetitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If joint channel estimation is performed across non-consecutive slots, then channel estimation accuracy is improved, but power consistency and phase continuity deteriorate
Solution Approach 1:
The patent divides the channel estimation process into separate time domain windows for different slots. Each window independently processes channel estimation for its associated slot, allowing non-consecutive slots to be handled separately while maintaining their individual power and phase characteristics. This segmentation resolves the contradiction by enabling accurate channel estimation across discontinuous time resources without requiring continuous power and phase maintenance.
2Adaptability or versatility
If repetitions are canceled or overlapped to accommodate other transmissions, then network flexibility and resource utilization are improved, but channel estimation reliability deteriorates
Solution Approach 1:
The patent establishes time domain window configurations in advance through higher layer signaling, defining which slots and repetitions belong to specific channel estimation windows. This preliminary configuration allows the system to adaptively cancel or overlap repetitions for other transmissions while maintaining reliable channel estimation within the pre-defined window boundaries, resolving the contradiction between flexibility and reliability.
3Measurement precision
If time domain window size is increased to include more slots for joint channel estimation, then channel estimation performance is improved, but complexity of managing power and phase consistency increases
Solution Approach 1:
The patent implements dynamic time domain window configuration where the window size and associated slots are flexibly determined based on higher layer signaling and current transmission conditions. Rather than using a fixed large window that would require complex power and phase management, the system dynamically adjusts window parameters to match actual transmission patterns, improving channel estimation performance while keeping complexity manageable through adaptive configuration.
Data Source
AI summary
A computer-readable storage medium stores instructions to configure a UE for joint channel estimation of uplink transmissions in a Fifth Generation New Radio (5G NR) and beyond wireless network, and to cause the UE to perform operations. The operations include decoding DCI or higher layer signaling received from a base station. The DCI or the higher layer signaling indicates a number of PUSCH repetitions forming the uplink transmissions. The operations further include decoding higher layer signaling received from the base station, the higher layer signaling indicating a size of a time domain window (TDW) associated with the uplink transmissions. The TDW has a number of slots equal to the size. Each of the PUSCH repetitions within the TDW is associated with a same carrier phase and a same transmit power.