Joint Channel Estimation Timing for Multi-Occasion PDSCH Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing joint channel estimation across multiple PDSCH reception occasions, leading to incomplete processing times and potential resource wastage due to retransmissions of feedback messages.
Innovation Solution
Incorporating an additional offset in the processing time equation to account for joint channel estimation, allowing UEs to perform joint channel estimation across multiple PDSCH reception occasions, thereby ensuring complete processing before transmitting feedback messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If joint channel estimation is performed across multiple PDSCH reception occasions, then channel estimation accuracy is improved, but processing time requirements increase
Solution Approach 1:
The patent applies preliminary action by performing joint channel estimation across multiple PDSCH reception occasions before transmitting the feedback message. The UE accumulates channel state information from multiple reception occasions (N occasions) and completes the joint estimation process in advance, ensuring that the processing time equation N1 includes an additional offset to account for this extended estimation duration. This allows the system to benefit from improved channel estimation accuracy while properly accounting for the increased processing time requirements in the feedback timing calculation.
2Reliability
If processing time is extended to accommodate joint channel estimation, then estimation completeness is improved, but resource efficiency deteriorates due to potential retransmissions
Solution Approach 1:
The patent implements feedback by transmitting the channel estimation results in a feedback message after the extended processing time N1 has been allocated. The base station receives this feedback and uses the completed joint channel estimation to improve subsequent transmissions. By ensuring the estimation is complete before feedback transmission, the system avoids retransmissions caused by incomplete or inaccurate estimation, thereby improving resource efficiency despite the extended processing time.
Solution Approach 2:
The patent applies parameter changes by modifying the processing time parameter N1 to include an additional offset that accounts for joint channel estimation across multiple PDSCH reception occasions. This parameter adjustment ensures that the processing time is sufficient for complete estimation while maintaining proper timing relationships in the system. The offset is calculated based on the number of reception occasions N and the subcarrier spacing, allowing flexible adaptation to different configuration scenarios.
3Stability of the object's composition
If additional offset is added to processing time equation, then phase continuity is improved, but processing complexity increases
Solution Approach 1:
The patent applies local quality by focusing the additional processing offset specifically on the channel estimation portion of the processing time, rather than uniformly increasing all processing intervals. The offset is localized to account for the joint estimation across N PDSCH reception occasions, allowing phase continuity to be improved in the critical channel estimation function without unnecessarily increasing overall system complexity. This targeted approach maintains simplicity in other processing aspects while achieving the desired phase coherence.
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive demodulation reference signals (DMRSs) in multiple physical downlink shared channel (PDSCH) reception occasions. The UE may perform joint channel estimation using the DMRSs in the multiple PDSCH reception occasions. The UE may transmit a feedback message after a processing time that includes an offset associated with the joint channel estimation, wherein the processing time starts after a last symbol of a PDSCH reception occasion of the multiple PDSCH reception occasions and ends before a first symbol of the feedback message. Numerous other aspects are described.