US-12627359-B2 - Method and apparatus for radio link monitoring and beam failure detection measurements in wireless communication system

US12627359B2US 12627359 B2US12627359 B2US 12627359B2US-12627359-B2

Abstract

The present disclosure relates to a 5G communication system or a 6G communication system for supporting higher data rates beyond a 4G communication system such as long term evolution (LTE). The present disclosure provides method and apparatus for RLM and BFD measurements in next generation wireless communication system.

Inventors

Anil Agiwal

Assignees

SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20220228
Priority Date: 20210302

Claims (15)

1 . A method performed by a terminal in a wireless communication system, the method comprising: receiving, from a base station, a radio resource control (RRC) message including information associated with a relaxation of a radio link monitoring (RLM); identifying that the relaxation of the RLM is configured, a timer for detecting a radio link failure (RLF) of a special cell (SpCell) is not running, and a discontinuous reception (DRX) cycle length is not longer than 80 ms; based on the information included in the RRC message, identifying whether a radio link quality of an RLM reference signal (RS) resource is better than a threshold; and in case that the radio link quality of the RLM RS resource is better than the threshold, performing a measurement over a relaxed evaluation period for the RLM, based on the identification that the relaxation of the RLM is configured, the timer is not running, and the DRX cycle length is not longer than 80 ms.
2 . The method of claim 1 , further comprising: in case that the radio link quality of the RLM RS resource is not better than the threshold, performing a measurement over a normal evaluation period for the RLM, and wherein the relaxed evaluation period for the RLM is an integer multiple of the normal evaluation period for the RLM.
3 . The method of claim 1 , further comprising: transmitting, to the base station, a capability message associated with indicating whether the measurement over the relaxed evaluation period for the RLM is supported.
4 . The method of claim 1 , further comprising: in case that the radio link quality of the RLM RS resource is worse than a threshold value, Qout, corresponding to an out-of-sync block error rate, transmitting, to a higher layer, an out-of-sync indication; and based on the out-of-sync indication, starting the timer and performing the measurement over the normal evaluation period for the RLM.
5 . A method performed by a base station in a wireless communication system, the method comprising: transmitting, to a terminal, a radio resource control (RRC) message including information associated with a relaxation of a radio link monitoring (RLM), wherein a configuration of relaxation of the RLM, a non running state of a timer for detecting a radio link failure (RLF) of a special cell (SpCell), and a discontinuous reception (DRX) cycle length being not longer than 80 ms are identified, wherein, based on the information included in the RRC message, whether a radio link quality of an RLM reference signal (RS) resource is better than a threshold is identified, and wherein, in case that the radio link quality of the RLM RS resource is better than the threshold, a measurement is performed over a relaxed evaluation period for the RLM, based on the identification that the relaxation of the RLM is configured, the timer is not running and the DRX cycle length is not longer than 80 ms.
6 . The method of claim 5 , wherein, in case that the radio link quality of the RLM RS resource is not better than the threshold a measurement over a normal evaluation period for the RLM is performed, and wherein the relaxed evaluation period for the RLM is an integer multiple of the normal evaluation period for the RLM.
7 . The method of claim 5 , further comprising: receiving, from the terminal, a capability message associated with indicating whether the measurement over the relaxed evaluation period for the RLM is supported.
8 . The method of claim 5 , in case that the radio link quality of the RLM RS resource is worse than a threshold value, Qout, corresponding to an out-of-sync block error rate, the timer is started based on the out-of-sync indication, the out-of-sync indication being transmitted from a lower layer to a higher layer within the terminal, and wherein, in case that the timer is started, the measurement is performed over the normal evaluation period for the RLM.
9 . A terminal in a wireless communication system, the terminal comprising: a transceiver; and a controller coupled with the transceiver configured to: receive, from a base station, a radio resource control (RRC) message including information associated with a relaxation of a radio link monitoring (RLM), identify that the relaxation of the RLM is configured, a timer for detecting a radio link failure (RLF) of a special cell (SpCell) is not running, and a discontinuous reception (DRX) cycle length is not longer than 80 ms, based on the information included in the RRC message, identify whether a radio link quality of an RLM reference signal (RS) resource is better than a threshold, and in case that the radio link quality of the RLM RS resource is better than the threshold, perform a measurement over a relaxed evaluation period for the RLM, based on the identification that the relaxation of the RLM is configured, the timer is not running, and the DRX cycle length is not longer than 80 ms.
10 . The terminal of claim 9 , wherein the controller is further configured to: in case that the radio link quality of the RLM RS resource is not better than the threshold, perform a measurement over a normal evaluation period for the RLM, wherein the relaxed evaluation period for the RLM is an integer multiple of the normal evaluation period for the RLM.
11 . The terminal of claim 9 , wherein the controller is further configured to: transmit, to the base station, a capability message associated with indicating whether the measurement over the relaxed evaluation period for the RLM is supported.
12 . The terminal of claim 9 , wherein the controller is further configured to: in case that the radio link quality of the RLM RS resource is worse than a threshold value, Qout, corresponding to an out-of-sync block error rate, transmit, to a higher layer, an out-of-sync indication, and based on the out-of-sync indication, start the timer, and perform the measurement over the normal evaluation period for the RLM.
13 . A base station in a wireless communication system, the base station comprising: a transceiver; and a controller coupled with the transceiver configured to: transmit, to a terminal, a radio resource control (RRC) message including information associated with a relaxation of a radio link monitoring (RLM), wherein a configuration of relaxation of the RLM, a non running state of a timer for detecting a radio link failure (RLF) of a special cell (SpCell), and a discontinuous reception (DRX) cycle length being not longer than 80 ms are identified, wherein, based on the information included in the RRC message, whether a radio link quality of an RLM reference signal (RS) resource is better than a threshold is identified, and wherein, in case that the radio link quality of the RLM RS resource is better than the threshold, a measurement is performed over a relaxed evaluation period for the RLM, based on the identification that the relaxation of the RLM is configured, the timer is not running and the DRX cycle length is not longer than 80 ms.
14 . The base station of claim 13 , wherein, in case that the radio link quality of the RLM RS resource is not better than the threshold, a measurement over a normal evaluation period for the RLM is performed, and wherein the relaxed evaluation period for the RLM is an integer multiple of the normal evaluation period for the RLM.
15 . The base station of claim 13 , wherein the controller is further configured to: receive, from the terminal, a capability message associated with indicating whether the measurement over the relaxed evaluation period for the RLM is supported, wherein, in case that the radio link quality of the RLM RS resource is worse than a threshold value, Qout, corresponding to an out-of-sync block error rate, the timer is started based on the out-of-sync indication, the out-of-sync indication being transmitted from a lower layer to a higher layer within the terminal, and wherein, in case that the timer is started, the measurement is performed over the normal evaluation period for the RLM.

Description

TECHNICAL FIELD The disclosure relates to a wireless communication system. Specifically, the disclosure relates to an apparatus, a method and a system for RLM (radio link monitoring) and BFD (beam failure detection) measurements in wireless communication system. BACKGROUND ART Considering the development of wireless communication from generation to generation, the technologies have been developed mainly for services targeting humans, such as voice calls, multimedia services, and data services. Following the commercialization of 5G (5th-generation) communication systems, it is expected that the number of connected devices will exponentially grow. Increasingly, these will be connected to communication networks. Examples of connected things may include vehicles, robots, drones, home appliances, displays, smart sensors connected to various infrastructures, construction machines, and factory equipment. Mobile devices are expected to evolve in various form-factors, such as augmented reality glasses, virtual reality headsets, and hologram devices. In order to provide various services by connecting hundreds of billions of devices and things in the 6G (6th-generation) era, there have been ongoing efforts to develop improved 6G communication systems. For these reasons, 6G communication systems are referred to as beyond-5G systems. 6G communication systems, which are expected to be commercialized around 2030, will have a peak data rate of tera (1,000 giga)-level bps and a radio latency less than 100 μsec, and thus will be 50 times as fast as 5G communication systems and have the 1/10 radio latency thereof. In order to accomplish such a high data rate and an ultra-low latency, it has been considered to implement 6G communication systems in a terahertz band (for example, 95 GHz to 3 THz bands). It is expected that, due to severer path loss and atmospheric absorption in the terahertz bands than those in mmWave bands introduced in 5G, technologies capable of securing the signal transmission distance (that is, coverage) will become more crucial. It is necessary to develop, as major technologies for securing the coverage, radio frequency (RF) elements, antennas, novel waveforms having a better coverage than orthogonal frequency division multiplexing (OFDM), beamforming and massive multiple input multiple output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, and multiantenna transmission technologies such as large-scale antennas. In addition, there has been ongoing discussion on new technologies for improving the coverage of terahertz-band signals, such as metamaterial-based lenses and antennas, orbital angular momentum (OAM), and reconfigurable intelligent surface (RIS). Moreover, in order to improve the spectral efficiency and the overall network performances, the following technologies have been developed for 6G communication systems: a full-duplex technology for enabling an uplink transmission and a downlink transmission to simultaneously use the same frequency resource at the same time; a network technology for utilizing satellites, high-altitude platform stations (HAPS), and the like in an integrated manner; an improved network structure for supporting mobile base stations and the like and enabling network operation optimization and automation and the like; a dynamic spectrum sharing technology via collision avoidance based on a prediction of spectrum usage; an use of artificial intelligence (AI) in wireless communication for improvement of overall network operation by utilizing AI from a designing phase for developing 6G and internalizing end-to-end AI support functions; and a next-generation distributed computing technology for overcoming the limit of UE computing ability through reachable super-high-performance communication and computing resources (such as mobile edge computing (MEC), clouds, and the like) over the network. In addition, through designing new protocols to be used in 6G communication systems, developing mechanisms for implementing a hardware-based security environment and safe use of data, and developing technologies for maintaining privacy, attempts to strengthen the connectivity between devices, optimize the network, promote softwarization of network entities, and increase the openness of wireless communications are continuing. It is expected that research and development of 6G communication systems in hyper-connectivity, including person to machine (P2M) as well as machine to machine (M2M), will allow the next hyper-connected experience. Particularly, it is expected that services such as truly immersive extended reality (XR), high-fidelity mobile hologram, and digital replica could be provided through 6G communication systems. In addition, services such as remote surgery for security and reliability enhancement, industrial automation, and emergency response will be provided through the 6G communication system such that the technologies could be applied in various fields such as industry,