Conditional CSI Reporting on CG-PUSCH for Uplink-Dominant Traffic
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Solution Overview
Problem
Conventional CSI reporting techniques are inefficient for uplink dominant traffic, leading to wasted resources and high overhead in triggering CSI reports from multiple UEs.
Innovation Solution
A UE transmits CSI only when it has data to send on a configured grant physical uplink shared channel (CG-PUSCH) and suppresses CSI reports when no data is present, and requests CSI reporting when downlink channel conditions change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional CSI reporting techniques are used for uplink dominant traffic, then CSI reports are transmitted periodically regardless of data presence, but overhead increases and resources are wasted
Solution Approach 1:
The patent applies dynamics by making the CSI reporting mechanism adaptive rather than static. The UE dynamically decides whether to transmit CSI based on the presence of uplink data in the buffer. When data is present, CSI is transmitted; when no data is present, CSI transmission is suppressed. This dynamic adjustment resolves the contradiction by maintaining reliable CSI reporting only when necessary, thereby reducing unnecessary overhead and energy consumption for uplink dominant traffic scenarios.
Solution Approach 2:
The patent changes the parameter of CSI reporting behavior from a fixed periodic transmission to a conditional transmission based on data buffer status. By using the data presence indicator (0 or 1) as a control parameter, the system transitions from always transmitting CSI to selectively transmitting CSI only when uplink data is present, thus reducing overhead while maintaining reporting reliability when needed.
2Loss of information
If CSI is transmitted periodically on CG-PUSCH, then channel information is available for downlink scheduling, but resource utilization efficiency decreases when no uplink data is present
Solution Approach 1:
The patent extracts the CSI transmission from the periodic CG-PUSCH schedule and conditions it on the presence of uplink data. Instead of always including CSI in periodic transmissions, the system separates CSI transmission from routine periodic uplink transmissions and only combines them when uplink data is actually present in the UE buffer. This extraction approach ensures channel state information is available when needed while improving resource utilization by avoiding unnecessary transmissions.
3Measurement precision
If multiple UEs are triggered to report CSI, then downlink channel conditions are monitored, but triggering overhead increases significantly
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously determine when CSI reporting is necessary based on its own data buffer status, rather than requiring network-triggered reporting. The UE independently monitors its uplink data presence and decides whether to include CSI in its transmission. This self-service mechanism eliminates the need for complex network-side triggering of multiple UEs, significantly reducing triggering overhead while maintaining accurate downlink channel condition monitoring through UE-initiated reporting when data is present.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for efficiently reporting channel state information (CSI) with limited overhead. In one aspect, if a user equipment (UE) is configured to transmit data and CSI to a base station periodically, the UE may transmit the CSI when the UE has data to transmit to the base station. In particular, the UE may transmit data and a CSI report during a transmission opportunity if the UE has data to transmit in the transmission opportunity. Otherwise, the UE may suppress transmission of the CSI report. In another aspect, a UE may be configured to transmit CSI to a base station when downlink channel conditions change. In particular, the UE may request to report CSI to the base station when channel conditions change, and the base station may trigger the UE to report the CSI after receiving the request.