US 11,902,938 B2 · Method and apparatus for determining radio link failure

Abstract

The present disclosure relates to a communication technique for converging an IoT technology with a 5G communication system to support a higher data transmission rate beyond a 4G system, and a system therefor. The present disclosure can be applied to intelligent services (e.g., a smart home, a smart building, a smart city, a smart or connected car, health care, digital education, retail business, and services associated with security and safety, or the like) on the basis of 5G communication technology and an IoT-related technology. The present invention provides a method for determining a radio link failure. The method comprises the steps of: identifying an indication of in synchronization (IS) or out of synchronization (OOS) with respect to a plurality of reception beams; starting a timer to determine a radio link failure when the indication of OOS is identified; and holding the timer when at least one of the plurality of reception beams is requested to be changed.

Claims10

Dependent claims

A method performed by a terminal in a wireless communication system, the method comprising:

performing a measurement on multiple beams on a serving cell;
based on the measurement, identifying whether a beam failure for a serving beam of the multiple beams is detected, wherein a detection of the beam failure is performed based on a beam failure detection timer;
in case that the beam failure for the serving beam is detected, determining to initiate a random access procedure for a beam failure recovery;
based on a determination to initiate the random access procedure for the beam failure recovery, starting a beam failure recovery timer;
and
during a running of the beam failure recovery timer, transmitting, to a base station, a random access preamble for a beam failure recovery request, based on a random access preamble dedicated to the beam failure recovery request,
wherein the random access preamble dedicated to the beam failure recovery request is associated with a selection of a suitable beam for the terminal, and
wherein the beam failure is detected in case that a number of beam failure instance is equal to or larger than a predetermined value.

5 more elements

Dependencies are inferred from the claim text.

Method and apparatus for determining radio link failure

Life of this patent

Method and apparatus for determining radio link failure

Life of this patent

Abstract

Claims10