Terminal CSI-RS Resource Measurement via MAC CE Signaling
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Solution Overview
Problem
In future radio communication systems, such as NR, the efficient use of periodic channel state information-reference signals (P-CSI-RSs) is compromised when a large number of resources are configured for beam management, leading to reduced throughput due to resource inefficiency.
Innovation Solution
A terminal is designed to receive configurations for multiple CSI-RS resources and selectively perform measurements based on a medium access control-control element (MAC CE), associating each CSI-RS resource with quasi-co-location (QCL) settings, allowing for efficient use of P-CSI-RS resources by only measuring the necessary resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large number of P-CSI-RS resources are configured for beam management, then beam management capability is improved, but resource use efficiency deteriorates and throughput is reduced
Solution Approach 1:
The patent applies dynamics by making the CSI-RS resource configuration adaptive rather than static. The network can dynamically indicate which CSI-RS resources to measure through MAC CE signaling, allowing the system to adjust the number of measured resources based on actual beam management needs. This resolves the contradiction by enabling versatile beam management when needed while reducing resource overhead when fewer beams are active.
Solution Approach 2:
The patent makes the CSI-RS resource configuration multi-functional by using a single configuration mechanism that serves both beam management and resource efficiency purposes. The MAC CE indication mechanism provides universal control over CSI-RS measurement, allowing the same infrastructure to support both comprehensive beam management and efficient resource usage depending on the indicated resources.
2Adaptability or versatility
If a large number of P-CSI-RS resources are configured for beam management, then beam management capability is improved, but throughput is reduced
Solution Approach 1:
The dynamic indication mechanism allows the system to adapt the number of measured CSI-RS resources to actual requirements. When comprehensive beam management is needed, more resources can be indicated; when fewer beams are active, fewer resources are measured. This dynamic adjustment prevents unnecessary resource overhead that would reduce throughput while maintaining the capability for comprehensive beam management when needed.
3Measurement precision
If the terminal measures all configured CSI-RS resources, then measurement completeness is improved, but resource use efficiency deteriorates
Solution Approach 1:
The patent extracts only the necessary subset of CSI-RS resources for measurement from the full configured set. The MAC CE indication mechanism allows the network to specify which particular CSI-RS resources should be measured, extracting only those needed for current beam management tasks. This ensures measurement completeness for the relevant resources while avoiding the resource overhead of measuring all configured resources.
Solution Approach 2:
Instead of requiring measurement of all configured CSI-RS resources (excessive action), the patent implements partial measurement of only the indicated resources. This partial action is sufficient for effective beam management while significantly improving resource use efficiency by avoiding measurements of resources that are not currently needed.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes: a receiving section that receives a configuration of a plurality of channel state information-reference signal (CSI-RS) resources and receives a medium access control-control element (MAC CE) indicating one CSI-RS resource among the plurality of CSI-RS resources; and a control section that performs measurement of the CSI-RS resource and does not perform measurement of a CSI-RS resource other than the CSI-RS resource among the plurality of CSI-RS resources, in which the plurality of CSI-RS resources are individually associated with a plurality of quasi co-locations (QCLs). According to an aspect of the present disclosure, a P-CSI-RS resource can be efficiently used.