Counting Active Reference Signals for Joint CSI Reporting
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently reporting channel state information (CSI) for both downlink and uplink channels, which affects the reliability and latency of wireless communications.
Innovation Solution
The system configures user equipment (UE) to count and report the maximum number of active reference signal resources within a transmission time interval (TTI) for joint CSI reporting, allowing for improved channel measurement and reporting for both downlink and uplink.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE reports CSI for both downlink and uplink channels, then the channel measurement accuracy is improved, but the reporting complexity and processing overhead increase
Solution Approach 1:
The joint CSI report is segmented into separate downlink CSI and uplink CSI components, each with its own reference signal resource counting mechanism. This allows the UE to independently manage and report downlink and uplink channel states using separate measurement procedures, reducing the overall reporting complexity while maintaining accuracy for both directions
Solution Approach 2:
The UE capability reporting mechanism is designed to be universal, supporting both separate and joint CSI reporting modes. The same reporting framework can handle different reporting scenarios (downlink-only, uplink-only, or joint reporting) by configuring appropriate reference signal resource counts, thereby managing complexity through a unified multi-functional approach
2Measurement precision
If the UE counts and reports maximum number of active reference signal resources, then the CSI reporting accuracy is improved, but the latency increases due to additional processing
Solution Approach 1:
The UE performs preliminary counting of active reference signal resources and determines the maximum number of resources in advance, before the actual CSI measurement and reporting. By pre-calculating and storing the reference signal resource counts, the UE eliminates the need for time-consuming calculations during the reporting phase, thus maintaining high CSI accuracy while reducing reporting latency
Solution Approach 2:
The UE autonomously manages its own reference signal resource counting and capability reporting without requiring network coordination or additional signaling exchanges. The UE self-determines its capability to handle joint CSI reporting and self-configures the reference signal resource counts, eliminating delays associated with network-side processing and decision-making
3Reliability
If the system configures joint CSI reporting for downlink and uplink, then the communication reliability is improved, but the processing overhead at the UE increases
Solution Approach 1:
The UE dynamically adjusts its processing allocation for joint CSI reporting based on the configured reference signal resource counts. When the maximum number of reference signal resources is configured, the UE optimizes its processing resources accordingly, enabling reliable joint downlink and uplink CSI reporting while adapting the processing overhead to the actual reporting requirements rather than maintaining fixed high processing levels
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may transmit, to a base station, a capability report that includes an indication of a maximum number of reference signal resources within a transmission time interval (TTI) for which the UE supports channel state information (CSI) reporting. The maximum number of reference signal resources may be based on a capability for supporting joint CSI reporting for both a downlink and an uplink. The UE may receive, from the base station, a report configuration in response to the capability report. Subsequently, the base station may transmit reference signals to the UE, which the UE may use to determine CSI for both the downlink and the uplink. The UE may then transmit, to the base station, a CSI report including the CSI for both the downlink and the uplink, in accordance with the report configuration.