UE CSI Transmission During Inactive DRX Periods
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and NR networks, user equipment (UE) faces challenges in transmitting channel state information (CSI) during discontinuous reception (DRX) mode, as it often needs to refrain from transmitting CSI during inactive DRX durations to conserve power, which can lead to the unintended dropping of acknowledgement (ACK) signals, causing performance issues.
Innovation Solution
The UE determines whether the resources for transmitting CSI fall within an inactive DRX duration and, if so, drops the CSI transmission, while ensuring the transmission of ACK signals by either multiplexing them with data on the physical uplink shared channel (PUSCH) or selecting new resources that do not overlap with the inactive period, thereby allowing ACK/NACK feedback during DRX operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE refrains from transmitting CSI during inactive DRX durations to conserve power, then energy consumption is reduced, but ACK signals may be unintentionally dropped causing performance issues
Solution Approach 1:
The patent segments the uplink transmission resources into separate CSI resources and ACK resources. The UE independently determines whether to transmit CSI based on DRX state while ensuring ACK transmission through separate resource allocation. This segmentation allows selective dropping of CSI without affecting ACK reliability during inactive DRX durations.
Solution Approach 2:
The patent implements dynamic resource selection where the UE can switch between different PUCCH resources for ACK transmission depending on whether CSI transmission is dropped. The system dynamically adjusts the ACK resource allocation based on the DRX state and CSI transmission decision, ensuring reliable ACK delivery while conserving power during inactive periods.
2Loss of information
If the UE transmits both CSI and ACK feedback during inactive DRX duration, then feedback completeness is improved, but power conservation benefits are reduced
Solution Approach 1:
The patent extracts the ACK transmission function from the combined CSI-ACK transmission and ensures it operates independently. By separating ACK resources from CSI resources, the system allows ACK feedback to be transmitted during inactive DRX duration while CSI can be dropped, achieving partial feedback completeness with reduced power consumption.
3Productivity
If the UE multiplexes CSI with control information during inactive DRX duration, then transmission efficiency is improved, but the complexity of resource management increases
Solution Approach 1:
The patent segments control information into separate CSI and ACK components with dedicated resources. This segmentation simplifies resource management by allowing independent handling of each information type - CSI can be dropped during inactive DRX while ACK uses predetermined resources, reducing the complexity of multiplexing decisions while maintaining transmission efficiency for critical ACK feedback.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may refrain from transmitting channel state information (CSI) if the CSI is configured to be transmitted during an inactive discontinuous reception (DRX) duration. The UE may determine that the CSI is configured to be transmitted during the inactive DRX duration based on determining that some or all of the configured time slot for transmitting the CSI occurs while the UE is operating in the inactive DRX duration. The UE may transmit feedback information, such as an acknowledgement (ACK), whether or not the UE drops the CSI.