Beam Failure Detection Mechanism for Rapid Recovery
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Solution Overview
Problem
Conventional beam failure detection methods in communication systems are inefficient, leading to increased latency and power consumption when a serving beam drifts due to environmental changes, as they require counting beam failure instances over a long period or relying solely on RRM measurements, which can delay data transmission and consume excessive power.
Innovation Solution
Implementing a method where a terminal device monitors beam failures immediately after a serving cell is activated, determining beam failure within a short predetermined period and triggering beam failure reports to facilitate quicker recovery, using timers and counters configured for rapid detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional beam failure detection methods are used, then beam failure can be detected, but detection latency is increased and power consumption is excessive
Solution Approach 1:
The patent applies preliminary action by configuring detection parameters (timers and counters) in advance before beam failure occurs. The terminal device is pre-configured with beam failure detection reference signals, timers (beamFailureDetectionTimer), and counters (BFI_COUNTER) so that when a beam failure event occurs, the device can immediately start detection without delay, resolving the contradiction between detection accuracy and detection latency
Solution Approach 2:
The patent implements dynamics by making the detection process adaptive and configurable. The network device can dynamically configure detection parameters including timer values, counter thresholds, and reference signal resources based on channel conditions and service requirements. This dynamic configuration allows the system to optimize between detection speed and accuracy in different scenarios, resolving the fixed trade-off in conventional methods
2Reliability
If conventional beam failure detection methods are used, then beam failure can be detected, but power consumption increases due to long monitoring periods
Solution Approach 1:
The patent applies periodic action by using configured timers and counters to control the monitoring process. Instead of continuous monitoring, the terminal device monitors beam failure instances periodically based on the beamFailureDetectionTimer and BFI_COUNTER configuration. This periodic monitoring reduces power consumption while maintaining detection accuracy by only activating monitoring when needed and stopping when the timer expires or threshold is reached
Solution Approach 2:
The patent implements parameter changes by allowing dynamic adjustment of detection parameters such as timer duration, counter thresholds, and reference signal periodicity. The network can configure these parameters based on channel conditions, service type, and power consumption requirements, enabling the system to adapt between aggressive detection (higher power) and conservative detection (lower power) modes to resolve the contradiction between reliability and energy consumption
3Reliability
If RRM measurements are used for beam failure detection, then detection can be performed, but data transmission is delayed
Solution Approach 1:
The patent applies segmentation by separating beam failure detection from general RRM measurement processes. The system uses dedicated beam failure detection reference signals and independent detection procedures with separate timers and counters, rather than relying on general-purpose RRM measurements. This segmentation allows beam failure detection to operate independently and trigger immediate recovery actions without waiting for periodic RRM measurement cycles, thus resolving the contradiction between detection capability and transmission speed
Data Source
AI summary
Embodiments of the present disclosure relates to beam failure detection. According to embodiments of the present disclosure, after a serving cell is activated from a deactivated state, a terminal device monitors a beam failure on a serving beam of the serving cell. If a beam failure instance indication is received within a short period after the activation, the terminal device determines that the beam failure is detected on the serving beam. In this way, a beam failure recovery can be quicker triggered to perform candidate beam search.