Deactivated-Cell Reference Signals for Beam Failure Detection
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Solution Overview
Problem
Wireless devices experience beam and radio link failures with deactivated cells that are not detected until activation, leading to increased latency and suboptimal selection of cells for activation due to outdated information, which affects communication efficiency.
Innovation Solution
Configuring resources for beam failure and radio link failure detection in deactivated network nodes, and reporting failure events and channel state information (CSI) for deactivated cells to enable optimal cell selection and reduce activation latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deactivated cells are not monitored for beam failure and radio link failure, then device complexity and energy consumption are reduced, but reliability deteriorates because failures are not detected until activation
Solution Approach 1:
The patent applies preliminary action by configuring the wireless device to monitor beam failure and radio link failure events in deactivated cells before activation. The network node provides configuration information including reference signal resources for monitoring, enabling the device to detect failures proactively. This preliminary monitoring ensures that when a deactivated cell is activated, the failure status is already known, improving reliability without requiring complex continuous monitoring of all deactivated cells.
2Reliability
If continuous monitoring of deactivated cells is performed, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements partial monitoring by selectively monitoring only specific reference signal resources in deactivated cells that are configured by the network. Instead of continuous comprehensive monitoring, the device monitors a subset of resources (CSI-RS, SSB, or other reference signals) based on configuration information. This partial action approach maintains sufficient reliability for failure detection while significantly reducing energy consumption compared to continuous monitoring of all cell activities.
3Measurement precision
If failure detection resources are configured for deactivated cells, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using a unified configuration mechanism that can monitor multiple types of reference signals (CSI-RS, SSB, and other reference signals) through a single failure detection framework. The configuration information from the network node provides a universal set of resources that can be applied across different deactivated cells and signal types. This multi-functional approach improves measurement precision for failure detection while avoiding the need for separate complex configuration mechanisms for each signal type.
4Productivity
If proactive monitoring and reporting of deactivated cell conditions is implemented, then communication efficiency is improved, but information processing load increases
Solution Approach 1:
The patent extracts only the critical failure detection information from deactivated cells and reports it to the network node. The wireless device monitors reference signal resources and extracts failure status information (beam failure, radio link failure) without processing all raw monitoring data. This extraction approach improves cell selection efficiency by providing timely failure information while minimizing information processing load by reporting only essential failure indicators rather than comprehensive cell state data.
Data Source
AI summary
The apparatus may be a wireless device configured to receive a first indication of a set of resources for one of (1) monitoring for a failure event or (2) measuring CSI associated with a corresponding set of deactivated cells associated with the wireless device for L1/L2 mobility. The apparatus may further be configured to (1) detect a failure event associated with a beam of at least one deactivated cell in the set of deactivated cells by monitoring the set of resources or (2) measure, based on the CSI resource configuration, CSI associated with resources in the set of resources for at least one deactivated cell in the set of deactivated candidate cells. The apparatus may further be configured to transmit, for an active cell, (1) a second indication of the detected failure event or (2) information regarding the measured CSI for the at least one deactivated cell.