Stale CSI Report Mechanism for Wireless Uplink Latency
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Solution Overview
Problem
Current wireless communication systems face difficulties in efficiently processing channel state information (CSI) reports due to misalignment in CPU capabilities between the network and user equipment, leading to omitted CSI reports and increased latency, which affects communication quality.
Innovation Solution
Implementing a stale CSI report mechanism that includes measurements from prior time periods, allowing user equipment to transmit CSI reports with reduced computational burden while providing useful information to the base station, even when current measurements cannot be processed in time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs current CSI measurements and generates current CSI reports, then the communication quality is improved, but the CPU load and processing time increase
Solution Approach 1:
The base station pre-configures multiple CSI reporting settings and associated measurement configurations in advance. When a CSI report is needed, the UE can quickly activate a pre-configured setting rather than configuring everything from scratch, reducing processing time and CPU load while maintaining measurement accuracy.
Solution Approach 2:
The CSI reporting configuration is divided into multiple independent settings, each with its own measurement resources and reporting parameters. The UE can selectively activate only the necessary segments based on current channel conditions and processing capabilities, reducing overall CPU burden while maintaining communication quality through targeted measurements.
2Measurement precision
If the UE processes and transmits current CSI reports in real-time, then the channel state accuracy is improved, but the latency increases due to processing time
Solution Approach 1:
Measurement resource configurations and reporting templates are pre-configured and stored in the UE before actual CSI reporting is needed. This preliminary setup eliminates configuration processing time during actual measurements, allowing the UE to quickly perform measurements and transmit reports with minimal latency while maintaining accurate channel state information.
Solution Approach 2:
The system dynamically adjusts the balance between measurement accuracy and reporting latency by allowing the base station to configure multiple CSI reporting settings with different measurement granularities and reporting frequencies. The UE can switch between these settings based on channel volatility and processing capacity, optimizing the trade-off between accuracy and speed.
3Loss of information
If the base station configures detailed CSI reporting settings, then the channel state information quality is improved, but the control signaling overhead increases
Solution Approach 1:
CSI reporting configuration is segmented into multiple independent reporting settings, each with specific measurement resources and parameters. The base station can activate only the necessary segments based on current channel conditions, avoiding the need to configure and transmit all possible settings, thereby reducing signaling overhead while maintaining high-quality CSI reporting when needed.
Solution Approach 2:
Comprehensive CSI reporting configurations are pre-configured and stored in both the base station and UE. The base station only needs to activate specific pre-configured settings through concise signaling rather than transmitting full configuration details each time, significantly reducing control signaling overhead while maintaining the ability to request high-quality CSI reports when channel conditions require it.
Data Source
AI summary
Some aspects of this disclosure relate to apparatuses and methods for implementing channel state information (CSI) reporting that includes a stale CSI report. Based at least in part on a CSI reporting configuration, a user equipment (UE) performs CSI measurements during a current reference time period, and generates one or more CSI reports including at least a stale CSI report. A stale CSI report is generated based at least in part on CSI measurements performed prior to the current reference time period. The UE further generates an uplink message including the one or more CSI reports, and transmits the uplink message to the base station under a reporting setting determined by the CSI reporting configuration.