NR Sidelink CSI Reporting via MAC-CE and SCI Triggering
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Solution Overview
Problem
Existing channel state information (CSI) reporting mechanisms for new radio (NR) side-links are inadequate, particularly in terms of report quantity and mechanism enhancements, leading to inefficiencies in wireless communication between user equipment (UE) and base stations, as well as between UEs.
Innovation Solution
Implementing a CSI reporting enhancement that includes a MAC control element (MAC-CE) message with an indicator for a second MAC-CE message and CSI report, and a side-link control information (SCI) message to trigger CSI reporting, along with various scheduling schemes and configurable bitwidths for CSI reporting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing CSI reporting mechanisms are used for NR side-links, then the implementation is simpler, but the report quantity and accuracy are insufficient
Solution Approach 1:
The patent segments the CSI reporting mechanism into multiple components: SCI messages for triggering, MAC-CE messages for carrying reports, and distinct reporting elements (CRI, SSBRI, L1-RSRP, L1-SINR). This segmentation allows flexible configuration of report quantity and content without requiring complete redesign of the entire reporting system, thus improving accuracy while managing complexity.
Solution Approach 2:
The patent introduces dynamic configuration capabilities where the base station can flexibly adjust CSI reporting parameters including report quantity, triggered CSI reporting, and configurable bitwidths for different reporting elements. This dynamic approach allows the system to adapt reporting complexity to actual channel conditions and requirements, improving measurement precision without permanently increasing system complexity.
2Measurement precision
If more CSI reporting elements are included in each report, then the channel condition assessment accuracy improves, but the overhead and resource utilization efficiency deteriorate
Solution Approach 1:
The patent implements partial reporting by allowing the UE to report only a subset of available CSI elements based on configuration and channel conditions. The UE can selectively include reporting elements such as CRI, SSBRI, L1-RSRP, and L1-SINR in each report, rather than always reporting all possible elements. This partial action approach maintains assessment accuracy for critical parameters while reducing overall overhead and improving resource utilization efficiency.
Solution Approach 2:
The patent enables dynamic parameter changes in CSI reporting, including configurable bitwidths for different reporting elements and flexible report quantity settings. The base station can adjust these parameters based on channel conditions, UE capabilities, and traffic requirements, allowing the system to optimize the balance between measurement precision and resource efficiency for each specific scenario.
3Loss of time
If CSI reporting is triggered frequently, then the channel state information freshness improves, but the signaling overhead and conflict with data payload transmissions increases
Solution Approach 1:
The patent implements periodic CSI reporting mechanisms where the base station can configure UEs to report CSI at specific intervals or triggered by certain events. This periodic action ensures that channel state information remains fresh and up-to-date without requiring continuous reporting, thereby reducing signaling overhead while maintaining information freshness. The periodic triggering aligns CSI reporting with actual channel variation patterns.
Solution Approach 2:
The patent establishes a feedback mechanism where the base station receives CSI reports from UEs and uses this information to adjust future reporting configurations and optimize resource allocation. This feedback loop allows the system to learn from actual channel conditions and adjust the frequency and content of CSI reporting to minimize overhead while maintaining necessary information freshness for effective scheduling and resource management.
Data Source
AI summary
Aspects are described for a user equipment (UE) comprising a transceiver configured to enable wireless communication with a base station and a second UE, and a processor communicatively coupled to the transceiver. The processor is configured to determine one or more channel state information (CSI) reporting elements out of a set of CSI reporting elements. The processor is further configured to generate a MAC control element (MAC-CE) message. The MAC-CE message comprises an indicator that indicates a second MAC-CE message and a CSI report. The CSI report comprises the one or more CSI reporting elements. The processor is further configured to transmit, using the transceiver, the MAC-CE message to the second UE via a side-link connection.