345 results about "Radio link failures" patented technology

A method can include transmitting, by a wireless device to a base station, via a first cell of the wireless device, an uplink signal based on determining a radio link failure of a second cell, the second cell being configured for early timing advance (TA) acquisition. The transmitting the uplink signal can be at least one of: based on the second cell being configured for early timing advance acquisition of the wireless device; or after receiving, by the wireless device, an indication to at least one of acquire a TA value of the second cell; start to acquire the TA value of the second cell; or transmit, by the wireless device via the second cell, a reference signal.

Certain aspects of the present disclosure provide techniques for RRC connection reestablishment by a remote UE. In some cases, a remote UE may be configured to detect, on at least one of a first link between a first relay UE and a first network entity or a second link between the remote UE and the first relay UE, a radio link failure (RLF) resulting in a loss of radio resource control (RRC) connection and attempt to reestablish RRC connection by performing at least one of relay selection or cell selection.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a user equipment (UE) supporting a fast Master Cell Group (MCG) link recovery for Multi Radio-Dual Connectivity (MR-DC) is provided. The method comprising: initiating the fast MCG link recovery, based on occurrence of a radio link failure (RLF) in MCG; and in case that failure of the fast MCG link recovery is identified, transmitting a RLF report including cause information indicating at least one of expiry of a timer, secondary cell group (SCG) deactivation or SCG failure.

The present disclosure provides a radio link failure reporting method and user equipment. The radio link failure reporting method includes: detecting, by user equipment (UE), occurrence of a radio link failure (RLF); and storing, by the UE, radio link failure information in an RLF report, wherein if the UE has performed a handover procedure before the RLF, the radio link failure information includes: information for indicating the type of the handover procedure; a global cell identity and a tracking area code of a cell where the latest handover command was received; and an elapsed time starting from reception of the latest handover command.

Devices and methods where a repeater device determines that a failure event has occurred, and in response to this determining, stops performing a forwarding operation. The failure event may be with respect to a control link between a network-controlled repeater and a base station, such as a radio link failure or failure to comply with a configuration.

A communication method using a relay apparatus including a relay device that performs relay operation of relaying a radio signal transmitted between a network and a user equipment, and a control terminal that receives a control signal used for control of the relay device from the network, the communication method including the steps of: starting, by the control terminal in a radio resource control (RRC) connected state in a first cell, an RRC connection re-establishment procedure to a second cell based on detection of a radio link failure (RLF) in the first cell; and controlling, by the relay apparatus, the relay operation based on whether the second cell is the same cell as the first cell when the RRC connection re-establishment to the second cell is successful.

In some examples of the techniques described herein, a user equipment (UE) may utilize an artificial intelligence (AI) model to predict whether radio link failure (RLF) will occur. For instance, a network entity may configure the UE to report a prediction of the occurrence of a RLF based on beam or cell-level measurements performed on the cell. In some approaches, the configuration may include a time of prediction for RLF and one or more thresholds or conditions for triggering the report. The UE may utilize the configuration(s) to predict a probability of RLF and to report the prediction if the one or more thresholds or conditions are satisfied. The prediction may be utilized to trigger the measurement or configuration of one or more candidate cells for a potential handover. Configuring the UE to predict whether RLF will occur may enable flexibility in how an AI model is utilized.

The disclosure relates to a fifth generation (5G) or sixth generation (6G) communication system for supporting a higher data transmission rate. A method of a terminal connected to a first node and a second node in a dual connectivity environment is provided. The method includes performing a radio link failure (RLF) prediction of the second node, transmitting, to at least one of the first node or the second node, a failure prediction report based on the RLF prediction, and performing, by a packet data convergence protocol (PDCP) entity based on the RLF prediction, PDCP pre-recovery including at least one of stopping uplink PDCP packet data unit (PDU) splitting to a radio link control (RLC) entity related to the second node for a split bearer, or retransmitting unacknowledged uplink PDCP data PDU previously submitted to an acknowledged mode (AM) RLC entity related to the second node for which successful delivery has not been confirmed by the AM RLC entity.

Methods, apparatuses and systems for machine learning-based radio link failure predictions. In one embodiment, a method includes: receiving, at a wireless communication device, a first plurality of beams from a first plurality of wireless communication nodes, wherein the first plurality of wireless communication nodes includes a first wireless communication node and a second plurality of wireless communication nodes; transmitting, at the wireless communication device, a report to the first wireless communication node, wherein the report is generated based on a first plurality of measurements taken for the first plurality of beams, and wherein the report includes: an indication indicating that a radio link failure (RLF) occurs within a subsequent time period.

Methods and apparatuses for a user equipment, UE, to report radio link failure, RLF, in a wireless network, said methods include sending, to a radio network node, RNN, in the wireless network, a first message including: a first RLF report related to an RLF that occurred in a cell of the wireless network, and a second indication of availability of one or more further RLF reports stored by the UE. The methods further include receiving, from the RNN, a second request for at least a portion of the stored RLF reports indicated by the second indication and sending, to the RNN, a second response including a second RLF report of the stored RLF reports. The apparatuses are configured to perform such methods.

Exemplary embodiments of the present disclosure relate to an apparatus, method, and computer-readable storage medium for mitigating the impact of positioning on radio link failure (RLF) procedures. In the method, an apparatus performs an RLF process and performs a positioning process, and at least one of the RLF process or the positioning process is coordinated to mitigate collisions between the processes.

The present disclosure relates to a network-controlled repeater for a mobile telecommunications network, wherein the network-controlled repeater includes circuitry configured to detect a radio link failure in a connection between the network-controlled repeater and a cell provided by a base station of the mobile telecommunications network; and release, based on the detected radio link failure, a first configuration of a forwarding function of the network-controlled repeater.

A master node used in dual connectivity communication with a user equipment. The master node is associated with a master cell group (MCG), and comprises a receiver for receiving from the user equipment, capability information indicating that the user equipment supports recovery from MCG radio link failure (RLF) via a signaling radio bearer (SRB) established between the user equipment and a secondary node, and a transmitter for transmitting configuration information configuring the user equipment to transmit a first message for MCG link recovery to the secondary node in response to the MCG RLF. The receiver receives a first message from the secondary node having received the first message, the first message being transmitted from the user equipment to the secondary node in response to the MCG RLF, and the transmitter transmits a second message to the secondary node, the second message being used to recover the dual connectivity communication.

A method can include transmitting, by a wireless device to a third base station, a report indicating radio link failure (RLF) information comprising at least one of a first reference location associated with a first cell of a first base station; a second reference location associated with a second cell of a second base station; a first distance between a location of the wireless device and the first reference location; and a second distance between the location of the wireless device and the second reference location.

Provided are a method and device for proactively predicting a radio link failure (RLF) of a UE. The method may include receiving configuration information for RLF prediction from a base station, performing signal measurement of a serving cell based on the configuration information, and predicting an RLF occurrence using an RLF output result output from a preconfigured prediction model by inputting a signal measurement result to the prediction model.

In some examples of the techniques described herein, a user equipment (UE) may utilize an artificial intelligence (AI) model to predict whether radio link failure (RLF) will occur. For instance, a network entity may configure the UE to report a prediction of the occurrence of a RLF based on beam or cell-level measurements performed on the cell. In some approaches, the configuration may include a time of prediction for RLF and one or more thresholds or conditions for triggering the report. The UE may utilize the configuration(s) to predict a probability of RLF and to report the prediction if the one or more thresholds or conditions are satisfied. The prediction may be utilized to trigger the measurement or configuration of one or more candidate cells for a potential handover. Configuring the UE to predict whether RLF will occur may enable flexibility in how an AI model is utilized.

Methods, systems, and devices for providing feedback about radio link failure (RLF) events that includes information about directional beams. A user equipment (UE) may experience an RLF event and lose connectivity with a network. After the UE reestablish a radio resource control (RRC) connection with the network, the UE may transmit an RLF report that include information about directional beams, information about a master node and a secondary node in a dual-connectivity procedure, information associated conditional handover procedures, or information about service time interruptions, or a combination thereof. One or more base stations may be configured to transmit at least portions of the information in the RLF report to other base stations as part of a message that may be an example of an RLF indication or a handover report. The message may be transmitted over an X2 interface or an Xn interface.

User equipment (UE) 110 receives from a first network node, e.g. source master node (S-MN) 120A, a configuration message 222 comprising a condition for a conditional handover and a condition for a cell addition or change. The UE 110 evaluates 226 whether the condition for the conditional handover and the condition for the cell addition or change are met, detects a radio link failure 230 of a connection between the UE 110 and the S-MN 120A before both conditions are met and establishes a radio connection 234 with a second network node, e.g. target master node (T-MN) 120C in response to the radio link failure 230. The UE 110 transmits to the T-MN 120C, a failure report 236 indicating the radio link failure taking place before both conditions were met. The T-MN 120C may transmit the failure report 238 to an operations administration and maintenance (OAM) entity 140 and / or determine adaptation information 240, 242 for the condition for the cell addition or change based on the failure report, in case the condition for the cell addition or change was determined by the T-MN 120C and was not met at the time when the radio link failure 230 took place.

Methods, systems, and apparatuses are provided for sending notification messages in multi-hop User Equipment (UE)-to-network (U2N) relay communications by intermediate relays in a wireless communication system, wherein a method comprises establishing a first PC5 connection with a remote UE for supporting a U2N relay communication between the remote UE and a network via the first relay UE and a second relay UE, establishing a second PC5 connection with the second relay UE for supporting the U2N relay communication, wherein the first relay UE is served by a first cell, detecting a PC5 Radio Link Failure (RLF) on the second PC5 connection or receiving a notification message indicating RLF of a Uu link from the second relay UE, performing a Radio Resource Control (RRC) connection re-establishment procedure to the network, omitting a transmission of a PC5-RRC message or not transmitting the PC5-RRC message to the remote UE if at least the first relay UE keeps being served by the first cell or a serving cell of the remote UE is still the first cell after completing the RRC connection re-establishment procedure, wherein the PC5-RRC message includes information indicating the PC5 RLF or a relay path failure, and transmitting the PC5-RRC message to the remote UE if at least the first relay UE changes to being served by a second cell or the serving cell of the remote UE is changed after completing the RRC connection re-establishment procedure.

The present disclosure relates to information transmission methods. In one example method, a first network device or a second network device triggers a terminal device to be handed over from a first cell to a second cell. The terminal device sends second information, where the second information includes information about a radio link failure that occurs between the terminal device and the second cell, or information about beam failure recovery that occurs between the terminal device and the second cell. The first network device or the second network device performs mobility robustness optimization based on the second information.

To improve communication efficiency by enhancing handover processing.SOLUTION: The terminal measures radio qualities of signals transmitted in cells provided by base stations to which the mobile station is connected, and performs, with respect to a learned model acquired by mechanical learning in which the radio qualities acquired in a learning phase are used as input and a predetermined value associated with occurrence of a radio link failure (RLF) in a case where handover is not performed within a period of a predetermined length after a predetermined period from a timing at which the radio qualities are acquired is used as teacher data, A predetermined notification based on a value acquired by inputting the radio qualities acquired by the terminal in the inference phase is transmitted to the base transceiver station.SELECTED DRAWING: Figure 5

Methods, systems, and devices for wireless communications are described that provide radio link failure (RLF) in accordance with RLF criteria associated with relatively low-latency applications. The RLF criteria may provide that when a radio link control (RLC) protocol data unit (PDU) of a low-latency RLC entity has been transmitted for a threshold quantity of times a transmitter may remove the PDU from a retransmission buffer and record one retransmission failure. RLF may be triggered by the transmitter based on a time-window associated with recorded retransmission failures, or based on a counter-based condition associated with the recorded retransmission failures. For the time-window-based condition, if there are at least a threshold quantity of retransmission failures with a time window, RLF may be triggered. For the counter-based condition, if a count of retransmission failures reaches a configured threshold value prior to expiration of a timer, RLF may be triggered.

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.

Disclosed are a radio link failure (RLF) detection method, apparatus and device, belonging to the field of communications, the method of the embodiment of the present application comprising: a terminal obtaining first information; the terminal determines whether a radio link failure (RLF) occurs according to the first information; wherein the first information comprises at least one of the following items: first frequency information, and the first frequency information is related to the frequency of executing retransmission stopping or retransmission frequency adjustment on the data packet; the second number of times information is related to the number of transmission failures of the data packet; and third number of times information related to the number of times the discard processing is performed on the data packet.

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 disclosure relates to a communication technique for convergence between an IoT technology and a 5G communication system for supporting higher data transmission rate than a 4G system, and a system thereof. The disclosure may be applied to intelligence services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail businesses, security and safety related services, etc.) on the basis of a 5G communication technology and an IoT-related technology. According to an embodiment of the present discourse, a method of a terminal in a communication system may comprise the steps of: receiving, from a base station, at least one segmented radio resource control (RRC) message including a part of an RRC message which has a size larger than a preconfigured size; storing the at least one received segmented RRC message; identifying that a radio link failure (RLF) has occurred with respect to the base station; and discarding the stored segmented RRC message upon the occurrence of the radio link failure.

A method and device for early RLF declaration at a user equipment (UE). The method includes identifying a condition indicative of an upcoming radio link failure (RLF) for early RLF declaration, obtaining location and frequency band information of the UE, and determining whether a baseline RLF condition is satisfied. When the baseline RLF condition is satisfied, the method includes declaring an RLF and initiating a link reestablishment procedure. When the baseline RLF condition is not satisfied, the method includes determining whether an RLF with an associated condition indicative of the upcoming RLF at a location and for a frequency band associated with the location and frequency band information has previously occurred. When an RLF with the condition indicative of the upcoming RLF at the location and for the frequency band has previously occurred, the method includes declaring an RLF, and initiating the link reestablishment procedure.

Disclosed in the present application are a method and apparatus used in radio link failure prediction for wireless communication. The method comprises: a communication terminal triggering a first process; and in response to any condition in a first condition set being met, terminating the first process, wherein the first condition set comprises at least the first condition, the first process depends on radio link failure prediction, the first condition depends on at least one of measurement or prediction, and the first process depending on the radio link failure prediction comprises: the first process being to execute the radio link failure prediction, or, the first process being triggered upon prediction of a radio link failure.

There is provided a user equipment comprises: means for detecting a radio link failure; means for, in response to the detected radio link failure, selecting a candidate cell for failure recovery; means for generating a security key; and means for sending a reconfiguration complete message to a first distributed unit associated with the selected candidate cell using the generated security key and for sending information indicating a recovery.

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.