Beam Failure Detection Timer Restart Logic

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In wireless communication systems, particularly in new radio communication technologies, there is a challenge in efficiently managing beam failure detection and recovery due to limited radio resources, which leads to latency and inefficiencies in data and control signal transmission.

Innovation Solution

A method and device for a user equipment (UE) that detects the absence of a downlink reference signal (DL RS) and restarts the beam failure detection (BFD) timer without incrementing the beam failure instance counter, allowing for timely beam failure recovery and efficient communication by managing counters and timers for no beam instance detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the beam failure instance counter is incremented every time a downlink reference signal is absent, then beam failure detection becomes more sensitive, but false beam failure detection increases due to resource unavailability

Engineering Contradiction:

Improvebeam failure detection sensitivityVSAvoidfalse detection rate

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent applies preliminary action by checking whether a downlink reference signal resource is actually available before incrementing the beam failure instance counter. The UE determines in advance whether the absence of DL RS is due to resource unavailability or actual beam failure, preventing false detection by preparing the condition check beforehand.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of incrementing the counter whenever DL RS is absent (conventional approach), the patent inverts the logic by only incrementing the counter when DL RS is absent AND the resource was supposed to be available. This inversion prevents false detection by reversing the conventional detection logic.

Inventive Principle:

Principle #13The other way round (Inversion)

2Speed

If the BFD timer is restarted frequently to detect beam failures quickly, then detection speed improves, but latency increases due to repeated timer operations

Engineering Contradiction:

Improvebeam failure detection speedVSAvoidcommunication latency

Core Design Contradiction:

SpeedVSLoss of time

Solution Approach 1:

The patent applies partial action by selectively restarting the BFD timer only when necessary (when DL RS is absent and resource was available). Instead of continuously restarting the timer on every DL RS absence, the system performs the timer restart operation partially and conditionally, reducing unnecessary time loss while maintaining detection speed.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If beam failure recovery procedures are triggered more frequently, then connection reliability improves, but system throughput decreases due to recovery overhead

Engineering Contradiction:

Improveconnection reliabilityVSAvoidsystem throughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies feedback by using the availability status of downlink reference signal resources as feedback information to determine whether to trigger beam failure recovery. The system monitors resource availability and adjusts recovery triggering based on this feedback, avoiding unnecessary recovery procedures when resources are simply unavailable rather than when actual beam failure occurs.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11962457B2Method of performing beam management, and device therefor

Publication Date: 2024.04.16 LG ELECTRONICS INC

AI summary

In the present disclosure, a UE restarts a beam failure detection timer without incrementing a beam failure instance counter, when detecting that the network skips transmitting a downlink reference signal (DL RS).