66 results about "Radio link failures" patented technology

The present disclosure provides a measurement result reporting method and related equipment, and relates to the technical field of wireless communication. The method comprises the following steps: in response to the indication information of a related protocol entity on a first cell set and / or a second cell set, or the timeout of a timer, determining that a radio link failure is detected on the corresponding cell set, wherein the related protocol entity comprises at least one of the following: a physical layer entity, a medium access control layer (MAC) entity, a radio link control layer (RLC) entity, and a radio resource control layer (RRC) entity; and storing radio link failure information, wherein the radio link failure information comprises at least one of the following: height information, speed information, and beam measurement result information related to the height. The present disclosure can enable a terminal device to report measurement results carrying spatial information to a network side.

The application discloses a terminal configuration deactivation method, device and communication equipment, and belongs to the technical field of communication. The terminal configuration deactivation method of the embodiment of the application comprises the following steps: in the case that a deactivation trigger condition is met, a terminal deactivates at least one quality of experience (QoE) configuration in QoE configuration information according to first information or a preset rule, wherein the first information is used for indicating selection information of the deactivation QoE configuration; wherein the deactivation trigger condition comprises at least one of the following: receiving deactivation indication information sent by a network device; a first measurement parameter in a minimum drive test (MDT) measurement meeting a first threshold condition; a radio link failure (RLF) occurring between a terminal and a network side; terminal power being less than a second threshold; and terminal temperature being greater than a third threshold.

The present disclosure relates to radio link failure (RLF) detection for underlying triggered mobility. In some example embodiments, a method is provided that includes receiving at least one underlying triggered mobility (LTM) configuration message from a network node, the at least one LTM configuration message including at least one timer configuration for monitoring of an ongoing or impending radio link failure (RLF), monitoring at least one beam from the network node based on the at least one timer configuration.

Systems and methods are disclosed that relate to determining cells in a report for which to include predicted Handover Failure (HOF) and / or predicted Radio Link Failure (RLF) post- Handover (HO) related information. In one embodiment, a method performed by a wireless device for determining a subset of a set of neighbor cells for which to include predicted HOF and / or predicted RLF post-HO related information in a report comprises generating a report such that the report comprises predicted HOF and / or predicted RLF post-HO related information for a subset of a set of neighbor cells according to a sorting quantity, wherein the sorting quantity is or is derived from any one or more of the following: HOF prediction information, RLF prediction information, measurement quantity, and predicted measurement quantity. The method further comprises transmitting the report.

Disclosed herein are systems, methods, and instrumentalities associated with autonomous service data unit (SDU) retransmissions and / or radio link failure (RLF) handling. A wireless transmit / receive unit (WTRU) may receive configuration information associated with a service data unit (SDU), wherein the configuration information may indicate a first condition and a second condition associated with SDU retransmission. The first condition may be related at least to a remaining time associated with the SDU and the second condition may be related at least to whether a part of the SDU is pending for transmission. The WTRU may be further configured to determine whether the first condition and the second condition are both met, and based on a determination that the first condition and the second condition are both met, the WTRU may re-transmit at least a segment of the SDU.

A wireless transmit / receive unit (WTRU) comprises a processor configured to send capability information related to radio link failure (RLF) prediction based on an artificial intelligence (AI) / machine learning (ML) model, receive configuration information associated with radio link monitoring (RLM) and RLF detection and prediction, wherein the configuration information comprises an early synchronization configuration associated with a target cell for RLF recovery. The processor may predict radio link failure of a serving cell of the WTRU at a predicted RLF time, perform early synchronization with the target cell based on the early synchronization configuration, detect a RLF of the serving cell at the predicted RLF time or within a time window that includes the predicted RFL time, and perform a recovery of a connection via the target cell.

The present disclosure relates to methods and apparatus for radio link failure, radio link monitoring, and / or radio link recovery in multipath wireless communications. For example, a method implemented by a first WTRU includes receiving configuration information indicating first and second radio link configurations and first and second thresholds, where the first threshold is greater than the second threshold, determining that uplink data is pending for a first transmission to a network entity via a second WTRU, the first transmission associated with the first communications link, determining channel conditions for a second transmission from the network entity, the second transmission associated with the second communications link, and performing a first radio link procedure using the first radio link configuration based on the measured channel conditions being greater than the second threshold and less than the first threshold.

In some example embodiments, there may be provided a method, comprising transmitting, based at least in part on detection that a Radio Link Failure (RLF) of a radio link associated with at least one first cell about to occur, an activation request to at least one second cell which is inactive, wherein the activation request includes spectrum aggregation activation for at least one spectrum resource, and switching, based at least in part on an indication from a network node, to a radio link associated at least one inactive second cell.

The application discloses a method and device used in wireless communication. A first node receives a first RRC message, the first RRC message comprising a configuration for at least one handover candidate cell; a first prediction and a second prediction are respectively performed, a result of the first prediction is that a handover condition to a first cell is met within a first time window, and a result of the second prediction is that a radio link failure occurs within a second time window; a first action is performed according to a time domain position relationship between the first time window and the second time window; wherein the at least one handover candidate cell comprises the first cell; when a starting time of the first time window is earlier than a starting time of the second time window, the first action is to apply a stored configuration for the first cell at a first time. The application can effectively support a predicted cell handover, and avoid a radio link failure.

Disclosed in the embodiments of the present disclosure are a sidelink (SL) radio link failure (RLF) detection method and apparatus, which can be applied to systems such as the Internet of Vehicles, V2X and V2V. The method comprises: a terminal device determining a receiving situation of hybrid automatic repeat request (HARQ) feedback on a physical sidelink feedback channel (PSFCH); and according to the receiving situation of the HARQ feedback on the PSFCH, determining whether a unicast connection triggers an SL RLF, wherein the unicast connection is a unicast connection established by a sending terminal and a receiving terminal on an SL, the sending terminal and the receiving terminal perform SL communication by means of a plurality of carriers, which are associated with the unicast connection. By means of implementing the embodiments of the present disclosure, the problem of how to effectively detect an RLF in an SL carrier aggregation scenario can be solved, such that an RLF mechanism can be supported in a carrier aggregation scenario during SL communication.

Aspects described herein relate to reporting out-of-sync on a downlink (DL) to a network entity by sending a report to the network entity indicating an out-of-sync status of the DL based on comparing a difference between a downlink timing measurement for a signal and a previous downlink timing measurement for a previous signal to a threshold. In an example, a network entity receiving the report can send a response signal to cause a device reporting out-of-sync to correct DL timing or perform a random access procedure.

A method for sending a handover success report includes: sending the handover success report in a case that Conditional Handover (CHO) is successful, wherein the handover success report includes at least one of: signal measurement results of neighbor cells by the terminal device; signal measurement results of candidate cells that do not meet a handover condition by the terminal device; a list of candidate cells that meet the handover condition; a list of the candidate cells that do not meet the handover condition; an Identity (ID) of a source cell; information indicating whether a Radio Link Failure (RLF) occurred in the source cell before the terminal device performs the CHO; or a duration from receiving a CHO configuration to triggering the CHO.

A method and an apparatus for handling radio link failure and relates to the field of communications technologies. The method for handling radio link failure is applied to a first terminal and includes: detecting a radio link failure between the first terminal and a second terminal; and reporting an indication message of the radio link failure to a serving base station of the first terminal, where the indication message includes at least one of the following information: an identifier of radio link, an indication of radio link failure, or a cause of the radio link failure.

A terminal device may be configured to receive, from a serving network device, a configuration message for unified operation of radio link monitoring and beam failure detection, the configuration message comprising an indication to use a timer for early radio link failure, RLF, detection, wherein said timer is configured to be triggered by a transmission of a measurement report associated with a candidate cell to the serving network device in case at least one indication related to a beam failure has been detected by the terminal device; monitor for the at least one indication related to the beam failure; start the timer for early RLF detection based on the transmission of the measurement report and detection of said at least one indication. Devices and methods are disclosed.

This application discloses a method and apparatus for use in a terminal, comprising: the terminal receiving a first signaling, the first signaling indicating a first threshold; performing a first Radio Link Failure (RLF) prediction, the first RLF prediction including predicting the probability of an RLF occurring within a first time window; performing a first measurement; the first measurement being based on a first RS (Reference Signal) resource set or a second RS resource set depending on the predicted probability of an RLF occurring within the first time window. The positioning method used by the terminal depends on the RS resource set on which the first measurement is based. The method proposed in this application can reduce the impact of RLF on terminal communication, especially on measurement.

This disclosure provides systems, methods and apparatuses in which a user equipment (UE) (102) maintains synchronization of a security context with a core network (CN) (110) during UE-initiated maintenance operations. In some aspects, the UE performs a temporary local release (130B) and starts a timer. The UE performs the maintenance operations for example, software updates, frequency shifting, radio link failure recovery, and the like. If the maintenance operations complete before expiration of the timer, the UE resumes a registered state. If the timer expires before the maintenance operations complete, the UE performs security context synchronization operations (150). In some aspects, the UE performs operations that can trigger the CN to perform authentication and key agreement procedures, thereby synchronizing security context between the UE and the CN.

Methods are disclosed for UE handling of arrangements of AI / ML related measurements and data collected but not yet transferred to the network in case of termination or loss of network connection. This can include mobility operations (e.g., handover); RRC state transitions; radio link failure; or change of PSCell. From configuration information received from a source network node specifying measurement and data collection for AI / ML model training, the UE handles the AI / ML data according to one of several procedures. The UE can delete it; send it to a target RAN node (with which the UE reestablishes network connection); continue performing AI / ML measurements; indicate to the target RAN node availability of previously collected data; or indicate to the target RAN node whether the source node configured AI / ML measurement configuration.

An operation method of an electronic device may include setting labels for a plurality of medium access control (MAC) contexts, respectively, identifying a permissible degree of radio link failure (RLF) occurrence, identifying information about a target distributed unit (DU), determining a shortest duration in which an RLF associated with a MAC layer potentially occurs in the target cell, determining a permissible MAC scheduling interruption duration, predicting a maximum transmittable data size between a source DU and the target DU, determining priorities of one or more UEs among the plurality of UEs, and migrating a part of data of the MAC contexts for the target cell from the source DU to the target DU based on the priorities of the one or more UEs and the labels.

In some implementations, a user equipment (UE) may receive, from a network node, configuration information indicating at least one maximum counter threshold associated with radio link failure (RLF). The UE may select, based on a prediction associated with radio link quality, a counter threshold from the at least one maximum counter threshold. The UE may start or stop an RLF timer based on an RLF counter satisfying the counter threshold.

A method by a wireless device includes obtaining assistance information for identifying at least one cell for performing a cell reestablishment procedure, and taking at least one action based on the assistance information. A method by a network node includes transmitting, to a wireless device, assistance information for identifying at least one cell for performing a cell reestablishment procedure. The method may further include configuring the wireless device to performing a cell search to identify at least one cell for performing the cell reestablishment procedure based on the assistance information.

The terminal uses the learning model to predict occurrence of a handover failure or a radio link failure and transmits prediction information indicating a prediction result of the handover failure or the radio link failure to the network.

The application provides a communication method, device and system, comprising: performing a first service through a first resource, the first resource being a resource of a first cell, the first communication device being under coverage of the first cell, and the first communication device establishing a radio resource control (RRC) connection with a first network device through the first cell; during the performance of the first service, a failure condition occurs, the failure condition comprising at least one of the following: a radio link failure (RLF), an RRC connection reconfiguration failure, an integrity check failure, or an RRC connection reestablishment; and initiating an RRC connection reestablishment process and performing the first service using the first resource. After the failure condition occurs, the first communication device can still use the first resource to perform the first service, thereby ensuring the transmission of the first service to some extent and reducing the impact of the failure condition on the first service.

The disclosure describes a method and device for handling a radio link failure (RLF). The method comprises detecting one or more trigger conditions that indicate a likelihood of occurrence of an RLF and transmitting a request for obtaining lower layers triggered mobility (LTM) configuration associated with one or more target cells, to a network entity. The method further comprises receiving the LTM configuration for each of the one or more target cells and selecting a target cell for performing an LTM handover based on the LTM configuration of each of the one or more target cells. The target cell meets a cell selection criterion. The method further comprises performing the LTM handover based on the selected target cell.

Provided are a method for wireless communication, and a terminal device. The method for wireless communication comprises: when a first condition is met and a terminal device has predicted that a handover trigger condition associated with at least one candidate cell among one or more candidate cells for conditional handover is met in the future, or when the terminal device has predicted that a radio link failure and / or a beam failure is about to occur in a serving cell in the future, the terminal device initiating a handover procedure to a first candidate cell, or the terminal device initiating a rapid recovery process for conditional handover, wherein the first condition is related to the signal quality and / or signal strength of the serving cell.

In some example embodiments, there may be provided a method, comprising receiving at least one Lower Layer Triggered Mobility (LTM) configuration message from a network node, which includes at least one timer configuration for monitoring of an ongoing or imminent Radio Link Failure (RLF), monitoring at least one beam from the network node based on the at least one timer configuration.

The present disclosure relates to radio link failure (RLF) detection for underlying triggered mobility. In some example embodiments, a method is provided that includes measuring reference signals from a serving cell and a target cell on respective beams associated with at least one timer configuration, where the timer configuration specifies when a radio link failure (RLF) is ongoing or about to occur, sending a measurement report to a network node based on a determination that the RLF is ongoing or about to occur, the measurement report including at least one indication that indicates that the RLF is occurring or about to occur.

The disclosure relates to a method for a terminal to act in a wireless communication system, the method comprising the steps of: receiving a measurement control; measuring a signal; transmitting a measurement report message to a serving cell; and upon detecting a radio link failure, the serving cell being a Non-Terrestrial Networks (NTN) cell, performing cell reselection to a terrestrial cell that is not the serving cell when a condition for omitting Radio Resource Control Connection re-establishment (RRE) is met.

Following radio link failure (RLF) of a radio link between a cellular internet-of-things (CIoT) user equipment (UE) and a source access node (nodeB) during a data transfer operation over a control plane between a mobility management entity (MME) of a narrow-band IoT (NB-IoT), a radio link is recovered by transmitting an RLF message from the CIoT UE to the MME of the NB-IoT network via a target nodeB, the target nodeB being different from the source nodeB. The RLF message is protected using a key associated with a non-access stratum (NAS) security context previously established between the CIoT UE and the MME of the NB-IoT network. The MME of the NB-IoT network can retrieve data that failed to be delivered to the CIoT UE due to the RLF during the data transfer operation over the control plane and provide said data to the UE via target nodeB.

The method comprises the following steps: a terminal device determines a reception condition of a hybrid automatic repeat request (HARQ) feedback on a physical sidelink feedback channel (PSFCH); and determines whether a unicast connection triggers a sidelink (SL) radio link failure (RLF) according to the reception condition of the HARQ feedback on the PSFCH. The unicast connection is a unicast connection established by a sending terminal and a receiving terminal on a sidelink, the sending terminal and the receiving terminal perform sidelink communication through a plurality of carriers, and the plurality of carriers are associated with the unicast connection. Through implementation of the embodiments of the present disclosure, the problem of how to effectively detect RLF in a sidelink carrier aggregation scenario can be solved, and the RLF mechanism can be supported in the sidelink carrier aggregation scenario.