497 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.

The present disclosure relates to handling a master cell group (MCG) failure in wireless communications. According to an embodiment of the present disclosure, a method performed by a wireless device in a wireless communication system comprises: receiving, from a source primary cell (PCell), a conditional mobility command including a mobility condition for a target PCell; starting a timer for a master cell group (MCG) failure recovery and transmitting MCG failure information related to the MCG failure recovery to a primary secondary cell (PSCell), based on detecting a radio link failure (RLF) on the source PCell; and based on that the mobility condition for the target PCell is satisfied while the timer is running: transmitting, to the PSCell, a new PCell indication informing a mobility from the source PCell to the target PCell; and performing a random access to the target PCell for the mobility.

According to some embodiments, a method is performed by a wireless device capable of operating in a non-terrestrial network (NTN). The method comprises determining an amount of time until a service link or feeder link switch and, based on the determined amount of time, modifying a radio link failure parameter used to determine when to declare a radio link failure (RLF).

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.

Embodiments include methods for a user equipment (UE) to synchronize timing with a wireless network. Such methods include receiving, from a first node serving a first cell in the wireless network, a first message that includes an absolute reference time and a corresponding reference event within downlink, DL, transmissions by the first node; and determining whether the UE received, from the first node, a timing adjustment value from which the UE can estimate a propagation delay of the DL transmissions. Such methods include, based on determining that the UE did not receive the timing adjustment value, performing one of the following: transmitting, to the first node, an indication that the UE did not receive the timing adjustment value; or declaring radio link failure with respect to the first cell and establishing a connection with a second cell capable of providing the information included in the first message.

A terminal apparatus for communicating with a base station apparatus is provided. The terminal apparatus includes a receiver configured to receive a Radio Resource Control (RRC) reconfiguration message including a parameter related to a first configuration from the base station apparatus, and a processing unit configured to perform configuration in accordance with the RRC reconfiguration message received. In a case that a first timer of an RRC protocol expires, a radio link failure of a source primary cell is not detected, and configuration related to Dual Active Protocol Stack (DAPS) handover is performed for the terminal apparatus, the processing unit reconfigures all of state variables configured for a Radio Link Control (RLC) entity of a Signaling Radio Bearer (SRB) in the source primary cell to respective initial values, resumes the SRB suspended in the source primary cell, and transmits an RRC message for notifying the base station apparatus that the DAPS handover has failed.

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.

A method (400) for reporting radio link failure, RLF, information. The method includes a user equipment, UE, detecting (s402) an RLF with respect to a master cell group, MCG. The method also includes, in response to detecting the RLF with respect to the MCG, the UE storing (s404) RLF information. The method also includes the UE sending (s406) a first message comprising MCG failure information, e.g., the RLF information, and activating a timer. The method also includes the UE receiving (s408) a second message after sending the first message and activating the timer. The method also includes the UE, in response to receiving the second message, determining (s410) that a condition is satisfied, wherein determining that the condition is satisfied comprises at least determining that the timer is still running. The method also includes, as a result of determining that the condition is satisfied, the UE deleting (s412) the RLF information.

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.

The present disclosure relates to a 5G or 6G communication system supporting a higher data transmission rate. A method of a user equipment (UE) is provided. The method includes receiving first information related to reception of a reference signal (RS). The RS comprises a channel state information RS (CSI-RS) or a synchronization signal. The RS is associated with a beam failure (BF) detection, a radio link failure (RLF) detection, or a CSI report. The method also includes receiving second information related to a hypothetical adaptation of a transmission power of the RS, and receiving the RS based on the first information. The method further includes determining a report amount indicating a hypothetical channel condition based on the second information and the reception of the RS, and transmitting a channel carrying the report amount indicating the hypothetical channel condition.

The present disclosure relates to a 5th-Generation (5G) or 6th-Generation (6G) communication system for supporting higher data transmission rates. A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes receiving a first system information block (SIB) associated with satellite assistance information from a base station, the first SIB including first information about a serving cell ephemeris table and second information about an effective duration of a serving cell astronomical table, and receiving a second system information block (SIB) associated with the neighbor satellite information from the base station based on a first timer whose duration is an effective duration of the serving cell ephemeris and a second timer for obtaining the first SIB prior to a radio link failure (RLF), the second SIB including third information about the neighbor cell ephemeris.

A reporting method is performed by a terminal device, and includes: reporting a radio link failure report (RLF-report) to a network-side device in response to triggering the RLF-report, wherein the RLF-report carries at least one of received signal strength indicator (RSSI) information or channel occupancy (CO) information.

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.

The present disclosure relates to base station and beam joint prediction and handover assisted by artificial intelligence. There is provided a method for radio communication, comprising: predetermining that a radio link failure (RLF) or handover will occur by using an artificial intelligence (AI) model, wherein, the predetermination is based at least on radio link condition information related to a user equipment (UE), and the radio link condition information comprises at least information reflecting condition of a radio link between the UE and a serving base station (SBS).

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.

A method for managing data transmission in a communication network operating in a radio link control (RLC) acknowledge mode (RLC AM), the network comprising a transmitter and a receiver, the method at the transmitter comprising: stopping retransmission of a protocol data unit, PDU, to the receiver in dependence on a number of retransmissions of the PDU exceeding a predetermined discard threshold value, wherein the predetermined discard threshold value is less than a threshold value associated with a radio link failure (RLF) of the network. The retransmission of the PDU may be stopped if a discard timer associated with the PDU exceeds a discard timer threshold value. The PDU may be associated with a PDU Set, and the discard timer is started when a first PDU of the PDU Set is received by the transmitter. The method may comprise, upon determining that retransmission of the PDU is stopped, transmitting a discard notification to the receiver. The method may comprise, upon determining that retransmission of the PDU is stopped, transmitting a PDU of a subsequent PDU Set.

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.

According to some embodiments, a method is performed by a wireless device. The method comprises receiving a configuration from a network node. The configuration comprises an indication of assistance data the wireless device is to collect to be used with a radio link failure machine learning model. The method further comprises collecting the assistance information according to the received configuration and transmitting a report including the collected assistance information to the network node.

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.

The invention provides a communication method and a communication device. The method comprises: a terminal device receiving indication information of a first network device, the terminal device being a terminal device accessed through a first cell of the first network device, the indication information being used for indicating the terminal device to measure a reference signal sent by a second network device through the first cell, and the terminal device receives a reference signal sent by the second network device through the first cell, and the terminal device measures the signal quality of the reference signal based on the indication information and sends the signal quality of the reference signal to the first network device. According to the scheme, the wireless link failure probability caused by switching execution of the terminal equipment can be reduced.

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.

The invention discloses a measurement reporting method based on event triggering, a measurement reporting configuration method based on event triggering, a reporting method, devices, equipment and a medium, and belongs to the technical field of communication. The measurement reporting method based on event triggering comprises the steps that a terminal obtains first configuration information from network side equipment, the first configuration information is used for configuring the terminal to be triggered to execute measurement reporting based on the target event; the terminal determines whether to execute measurement reporting according to the first configuration information; wherein the target event comprises predicting whether a radio link failure (RLF) occurs or not based on artificial intelligence (AI).

The present application is related to a method and apparatus for performing a mobility robustness optimization (MRO) mechanism in a handover procedure of a user equipment (UE). Upon a failure associated with a serving cell of a base station (BS), the UE performs a cell selection procedure to select a cell of a second BS, wherein the failure is one of a radio link failure (RLF), a handover (HO) failure, or a first conditional handover (CHO) failure. The selected cell is associated with a CHO configuration. The UE performs a CHO procedure and, upon a second CHO failure during the CHO procedure, performs a RRC re-establishment procedure. After entering into a connected state with the second BS, the UE transmits, to the second BS, an RLF report that includes both information related to the failure and information related to the second CHO failure.