SCell Activation via CSI-RS Configuration in 5G NR
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Solution Overview
Problem
In 5G wireless networks, the SCell activation procedure is often delayed or canceled due to canceled CSI-RS reception, leading to increased latency and inability to enhance data rates, primarily due to insufficient configuration parameters being provided to the UE for CSI-RS reception in shared spectrum scenarios.
Innovation Solution
The duration of the SCell activation procedure is extended based on the number of canceled CSI-RS receptions, and the base station configures the UE for periodic or semi-persistent CSI-RS reception, subsequently indicating aperiodic CSI-RS reception to avoid cancellation, allowing the UE to receive and process CSI-RS signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station sends CSI-RS for SCell activation, then the UE can perform CSI reporting, but the SCell activation procedure is delayed or canceled due to CSI-RS reception cancellation
Solution Approach 1:
The base station performs preliminary actions by sending MAC CE activation commands and configuring the UE with periodic or semi-persistent CSI-RS reception before actual SCell activation. This preliminary configuration ensures the UE is ready to receive CSI-RS signals, preventing reception cancellation and ensuring reliable SCell activation while minimizing latency.
Solution Approach 2:
The patent implements dynamic switching between periodic and aperiodic CSI-RS reception modes based on SCell activation status. During activation, the system dynamically transitions from periodic CSI-RS to aperiodic CSI-RS triggered by DCI, allowing flexible adaptation to changing network conditions and preventing reception cancellation due to insufficient configuration parameters.
2Productivity
If the UE is configured for periodic CSI-RS reception, then the SCell activation can proceed, but CSI-RS reception may be canceled due to insufficient configuration parameters in shared spectrum scenarios
Solution Approach 1:
The patent changes the CSI-RS reception parameter from periodic to aperiodic mode during SCell activation. The base station configures the UE with aperiodic CSI-RS triggered by DCI format 0_1 or 1_1, which includes specific field configurations (csi-RS-TriggerSubslotOffset, csi-RS-TriggerOffset) that ensure proper timing and resource allocation, preventing reception cancellation while enabling data rate enhancement.
Solution Approach 2:
The patent introduces DCI (Downlink Control Information) as an intermediary that triggers aperiodic CSI-RS reception. The DCI acts as a mediator between the base station's scheduling decisions and the UE's CSI-RS reception, providing the necessary configuration parameters and timing information to ensure reliable reception in shared spectrum scenarios while enabling high data rates.
3Reliability
If the base station uses aperiodic CSI-RS triggered by DCI, then the UE can receive CSI-RS without cancellation, but additional signaling overhead is required
Solution Approach 1:
The patent makes the DCI format multi-functional by using the same DCI format 0_1 or 1_1 for both uplink grant/downlink assignment and aperiodic CSI-RS triggering. This universal approach consolidates multiple functions into a single signaling mechanism, reducing overall signaling complexity while ensuring reliable CSI-RS reception through the standardized DCI fields.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods to provide SCell activation. In one example, an SCell activation procedure may be extended by a duration based on cancelation of CSI-RS reception. In another example, a base station may use particular configuration parameters to avoid cancelation of CSI-RS reception. In yet another example, a UE and a base station may use particular information for a CSI-RS reception/transmission on an SCell that is being activated.