Joint CSI and Decoding Feedback Resource Allocation
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting channel state information (CSI) reports due to independent scheduling of CSI reporting from downlink communications, leading to delayed adaptation of transmit parameters, which can result in increased retransmissions and resource wastage.
Innovation Solution
A method where user equipment (UE) determines a resource from a set of candidate resources based on decoding outcomes of downlink communications to transmit CSI reports, allowing implicit indication of acknowledgement (ACK) or negative acknowledgement (NACK) feedback, thereby conserving resources and improving CSI reporting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If CSI reporting is independently scheduled from downlink communications, then resource allocation for CSI reporting is simplified, but adaptability of transmit parameters and accuracy of CSI feedback deteriorate due to delayed adaptation
Solution Approach 1:
The patent combines CSI reporting with downlink communication acknowledgment by using the same uplink resources (PUCCH or PUSCH) that carry HARQ-ACK feedback to also carry CSI reports. This merging eliminates the need for separate CSI reporting resources and timing, allowing the UE to report CSI in the same uplink transmission that acknowledges downlink reception, thereby achieving both simplified resource allocation and improved adaptability.
2Loss of information
If multiple separate messages are used for CSI reporting and acknowledgment feedback, then information completeness is improved, but resource consumption and system overhead increase
Solution Approach 1:
The patent merges multiple uplink control messages (CSI report and HARQ-ACK feedback) into a single uplink transmission. The UE transmits both CSI information and acknowledgment feedback in the same PUCCH or PUSCH resource, reducing the number of separate messages, minimizing uplink resource consumption, and lowering power requirements while maintaining complete information transmission.
3Productivity
If CSI reporting timing is independent from downlink communication timing, then scheduling flexibility is improved, but feedback timeliness and system efficiency worsen due to delayed parameter adaptation
Solution Approach 1:
The patent implements preliminary action by having the UE prepare and transmit CSI reports in advance within the same uplink transmission opportunity that is already scheduled for acknowledgment feedback. By aligning CSI reporting timing with the downlink communication timing and using pre-configured uplink resources, the system achieves timely feedback without requiring additional scheduling delays, thereby improving system efficiency and reducing feedback latency.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine, based at least in part on one or more decoding outcomes associated with one or more downlink communications, a resource, of a set of candidate resources, to use for transmitting a channel state information (CSI) report. The UE may transmit the CSI report via the resource. Numerous other aspects are described.