469 results about "Handover procedure" patented technology

A method performed by a user equipment (UE) for controlling a hybrid automatic repeat request (HARQ) process is provided. The method includes receiving a handover command from a serving cell via broadcast signalling, the handover command including at least one of a HARQ feedback configuration or a HARQ state configuration associated with a candidate cell for a handover procedure; and applying the at least one of the HARQ feedback configuration or the HARQ state configuration after selecting the candidate cell as a target cell during the handover procedure.

A method detecting at least one of a mobility failure and a respective successful handover; determining a type of the mobility failure, wherein the type of the mobility failure is determined in response to the detected mobility failure; generating mobility failure information indicative of one or more parameters associated with the type of mobility failure, wherein the mobility failure information is generated, at least in part, based on the determined type of the mobility failure; and providing the mobility failure information and / or successful handover information including, at least in part, one or more parameters associated with the respective successful handover, wherein mobility failure information and / or successful handover information enable a network to determine whether a root cause associated with at least one of a respective mobility failure information and a respective successful handover information is a misconfiguration of one or more parameters controlling L3 handover procedures or L1 / 2 inter-cell mobility.

The present disclosure describes methods, system, and devices for performing network slice replacement during user equipment (UE) mobility. The method includes receiving, by a radio-access network (RAN), a list of to-be-switched protocol data unit (PDU) sessions during a handover procedure; selecting, by the RAN, a single-network slice selection assistant information (S-NSSAI) from a list of S-NSSAIs, the S-NSSAI corresponding to a PDU session in the list of to-be-switched PDU sessions; and sending, by the RAN, a message to an access and mobility management function (AMF), the message comprising the PDU session in a list of PDU sessions that require slice replacement and the S-NSSAI associated with each PDU session.

A method of managing configuration information for SDT operation is performed by a first RAN node. The method includes receiving an RRC message from a UE, receiving, from a second RAN node and during a handover procedure from the second RAN node to the first RAN node, an SDT configuration for use by a UE when the UE is operating in an RRC inactive state, and, after the handover procedure, communicating with the UE operating in the RRC inactive state based on a UE context of the UE.

Some wireless communication systems perform handover procedures to transfer user equipment (UE) communications between network entities. In some approaches, handover procedures may be performed via layer 3 (L3) signaling (e.g., L3 mobility). Layer 1 (L1) or Layer 2 (L2) triggered mobility (LTM) may allow handovers to be triggered via L1 or L2 signaling. Some of the techniques described herein may be utilized to handle key derivations when a UE is configured with candidate LTM cells of different network entities. For example, security keys may be updated with one or more inter-network entity LTM handovers after an initial handover. From the UE perspective, the UE may receive a configuration of LTM candidates once, but may perform one or more LTM executions using the configuration of LTM candidates. After the initial LTM procedure for the initial handover, the UE may receive an independent security configuration update for a subsequent LTM execution.

A user equipment (UE), next generation NodeB (gNB), or other network component can operate to configure a group configuration message that initiates a plurality of UEs in a coverage area of a non-terrestrial network (NTN) to concurrently transfer communication from a first beam of a first satellite to a second beam of a second satellite. The communications of one or more UEs can be re-directed to the second beam of the second satellite based on downlink control information of the group configuration message.

The embodiment of the invention relates to terminal equipment, a method, a device and a computer readable storage medium for QoE (Quality of Experience) continuity in an inter-RAT (Radio Access Technology) switching process within 5GC. In some embodiments, a first layer of a terminal device may receive a mobility command from a source terminal device. The first layer may provide an AT command to an upper second layer of the terminal device to notify the second layer to release at least one configuration QoE measurement and a related RRC ID. Thus, the second layer may release at least one configuration QoE measurement and a related RRC ID. Therefore, QoE continuity can be maintained in RAT handover from NR to LTE, and thus communication between the terminal device and the target network device can be ensured.

In wireless communication, a device may change, add, or handover between providers (e.g. nodes) of network access. This may include a conditional cell addition / change procedure and / or a conditional handover procedure. Execution conditions with candidate cell information and configurations may be used for selecting a target cell for the handover to reduce interruption time and improve reliability.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to one embodiment, a method for operating a user equipment (UE) in a wireless communication system may comprise receiving an L1 / L2 triggered mobility (LTM) medium access control control element (MAC CE) from a base station, determining whether the LTM MAC CE includes a timing advance (TA) value or a random access channel (RACH)-less handover indicator, and when the LTM MAC CE includes the TA value or the RACH-less handover indicator, performing a handover procedure to a target cell based on the TA value or the RACH-less handover indicator.

An embodiment is a method for operating a sidelink transmission (TX) UE in a wireless communication system. The method comprises the steps in which the TX UE: establishes a PC5 connection with a reception (RX) UE; transmits a first sidelink DRX configuration to the RX UE; transmits a measurement report to a source base station; receives a handover command from the source base station; and performs a handover procedure, wherein the TX UE transmits a second sidelink DRX configuration to the RX UE on the basis of completion of the handover procedure, and the second sidelink DRX configuration is set by a target base station of the handover procedure.

The present application relates to methods and apparatuses for handling failure. According to some embodiments of the present application, a user equipment (UE), includes a processor; and a receiver coupled to the processor, the receiver being configured to receive a radio resource control (RRC) reconfiguration message from a source node which manages a source cell, the RRC reconfiguration message including both conditional handover (CHO) configurations and per data radio bearer (DRB) dual active protocol stack (DAPS) HO indication for each candidate cell of one or more candidate cells; wherein the processor configured to: perform a first handover procedure to a first target cell selected from the one or more candidate cells; and in response to a failure of the first handover procedure, perform fallback to the source cell when at least one of the following conditions is met: a cell quality of the source cell is higher than or equal to that of each candidate cell of the one or more candidate cells, and there is no radio link failure (RLF) in the source cell; the source cell is selected by a cell selection procedure with configurations of the source cell maintained; the cell quality of the source cell is higher than a threshold; or an indication indicating that the UE is to perform fallback to the source cell is received.

A method for a user equipment (UE) is provided. The method includes the UE maintaining a Radio Resource Control (RRC) connection with a first base station (BS) of a first network while receiving transmissions from a second BS of a second network during at least one time period specified in a switch gap configuration. The UE receives an RRC reconfiguration message from the first BS that includes a first command and a second command. The first command instructs the UE to begin a handover procedure from the first BS to a third BS. The second command controls usage of the switch gap configuration by the UE following a failure of the handover procedure. The UE initiates the handover procedure according to the first command. The UE may suspend reception of transmissions from the second BS following reestablishment of the RRC connection after the handover failure based on the second command.

The present application is related to a method and apparatus for controlling a cell selection procedure and a handover procedure under 3GPP 5G New Radio (NR) technology. A method for wireless communication performed by a user equipment (UE) includes: starting a first timer for controlling a cell selection procedure; and performing the cell selection procedure to select a cell.

An operating method of a user equipment (UE) in a wireless communication system according to an embodiment of the disclosure may include receiving configuration information from a source base station (BS), determining, based on the configuration information, whether Dual Active Protocol Stack (DAPS) handover is configured for at least one bearer, based on a result of the determining, maintaining a link to the source BS, performing the DAPS handover on a target BS, suspending a Signaling Radio Bearer (SRB) configured for the source BS, and establishing a SRB for the target BS, when it is determined that the DAPS handover fails, determining whether a radio link failure (RLF) occurs in the link to the source BS, and based on a result of the determining, when the RLF does not occur in the link to the source BS, resuming the SRB configured for the source BS and reporting the failure of the DAPS handover.

A communication method implemented by an apparatus includes that a source access network element sends information of a unicast quality of service (QoS) flow of a protocol data unit (PDU) session corresponding to a multicast QoS flow of a multicast broadcast service (MBS) to a target access network element in a handover procedure. The target access network element forwards the information to a session management network element. The session management network element then indicates a user plane network element connected to the target access network element to send data of the MBS to a terminal device through the target access network element and by using a resource of the unicast QoS flow corresponding to the multicast QoS flow of the MBS.

Methods and devices are provided in which a user equipment (UE) receives configuration information from a base station (BS). The configuration information includes an indication enabling artificial intelligence (AI)-based handover. The UE determines that an event triggers transmission of a measurement report based on UE measurements and AI inference by the UE. The UE transmits the measurement report to the BS, and performs the AI-based handover to a target BS. The AI-based handover is initiated based on the measurement report.

A wireless communication method and / or apparatus is disclosed. The method comprises receiving, by a wireless communication terminal from a network node, configuration information for a handover procedure without a Random Access Channel, RACH procedure; initiating, by the wireless communication terminal, the handover procedure without a RACH procedure according to the configuration information; and transmitting, by the wireless communication terminal to a wireless communication node, uplink, UL, data for the handover procedure without a RACH procedure according to the configuration information.

Procedures, methods, architectures, apparatuses, systems, devices, and computer program products for handover procedures which use network predicted measurements. For example, a wireless transmit / receive unit (WTRU) may receive a handover command. The WTRU may receive a first set of measurements from a network. For example, the first set may be predicted measurements. The network may use artificial intelligence and / or machine learning models to generate the first set. The WTRU may obtain (e.g., measure and / or predict) a second set of measurements. The first and / or second set of measurements may be associated with a (e.g., same) first time interval and / or confidence level. Based on a comparison between the first set and second set, the WTRU may determine (i) to execute a handover, in a second time interval, and / or (ii) send feedback information. For example, the WTRU may determine an ideal time to actually execute the handover.

An apparatus at a CP of a CU associated with a plurality of wireless devices associated with a multi-modal service configured to output, for a target distributed unit (DU) associated with a handover procedure for the plurality of wireless devices, a first common request relating to a context of the plurality of wireless devices; and obtain, from the target DU and based on the first common request, a first common response relating to the context of the plurality of wireless devices.

Provided are a method and a device for performing a UE-based handover in a next generation wireless access network. The method of a UE may include receiving, from a source base station, an upper layer signaling including information on UE-based handover command and information on conditions for handover execution; storing a target cell configuration by using the information on conditions for handover execution; and determining whether to perform a handover procedure to a target cell, by determining whether predetermined conditions for handover are satisfied.

An apparatus at a CP of a CU associated with a plurality of wireless devices associated with a first multi-modal service configured to output, for a target distributed unit (DU) associated with a joint handover procedure for the plurality of wireless devices, a first request relating to a first context of a first wireless device in the plurality of wireless devices, wherein the first request comprises a first identifier of at least a second wireless device in the plurality of wireless devices associated with the joint handover procedure; and output, for the target DU, a second request relating to a second context of the second wireless device in the plurality of wireless devices, wherein the second request comprises a second identifier of at least the first wireless device.

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 application relates to a method and an apparatus for determining a failure type. One embodiment of the present disclosure provides a method performed by a user equipment (UE), which includes: performing a first listen before talk (LBT) procedure before transmitting an access message for a handover procedure; determining first LBT information and / or first handover failure (HOF) information when a HOF occurs; and transmitting the first LBT information and / or the first HOF information to a serving node of the UE.

Method comprising:receiving, from a first cell of a satellite, a handover command triggering a handover of a terminal from the first cell of the satellite to a second cell of the satellite and an assumed location of the terminal;determining an actual location of the terminal;checking one or more of the following conditions applies: the actual location of the terminal deviates from the assumed location by more than a first threshold, and the actual location of the terminal is on the side of the first cell of the coverage boundary and remote from the coverage boundary by at least a second threshold;preventing the terminal from performing the handover if at least one of the one or more checked conditions is fulfilled.

There is provided a method and apparatus for performing handover for devices performing local Artificial Intelligence (AI) inference. A User Equipment (UE) determines that a handover should occur not only based on signal strength, but on other factors relating to a serving base station's ability to assist the UE in its ongoing AI inference task, as compared to the target base stations. When a handover occurs, the target base station is selected based on its ability to assist the UE in its ongoing AI inference task, and the handover procedure may include forwarding AI-relevant data to the target base station and the UE pausing the AI inference task at a specified checkpoint, to be resumed once the handover is complete.

The present invention provides a method and system for implementing handover in NR networks, addressing the challenges associated with mobility management and ensuring efficient and reliable communication. The proposed solution leverages advanced algorithms and protocols to enhance the handover procedure, minimizing latency and reducing the likelihood of connection drops. By employing both network-controlled and UE-controlled handover mechanisms, the invention ensures robust and adaptive mobility management, catering to various network scenarios and user requirements. The proposed solution enables the terminal and the base station to perform appropriate type of synchronous reconfiguration in a given situation.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a network entity associated with a first cell, a measurement report triggering a first handover procedure from the first cell to a second cell, wherein the measurement report is transmitted to the network entity based at least in part on a second measurement associated with the second cell being greater than a first measurement associated with the first cell by a first threshold amount. The UE may monitor the first measurement and the second measurement for triggering a second handover procedure from the second cell to the first cell, wherein a second measurement report is transmitted triggering the second handover procedure if the first measurement is greater than the second measurement by a second threshold amount that is greater than the first threshold amount. Numerous other aspects are described.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a source cell, a candidate cell indication indicating one or more neighboring cells. The UE may receive a cell prioritization configuration that includes one or more rules for prioritizing the one or more neighboring cells in accordance with support for a packet data unit (PDU) set capability. The UE may transmit, to the source cell, a target cell indication indicating a target cell selected from among the one or more neighboring cells in accordance with the cell prioritization configuration. The UE may receive, from the source cell, a handover command for performing a handover procedure from the source cell to the target cell. Numerous other aspects are described.

Method comprising:receiving, from a first cell of a satellite, a handover command triggering a handover of a terminal from the first cell of the satellite to a second cell of the satellite and an assumed location of the terminal;determining an actual location of the terminal;checking one or more of the following conditions applies: the actual location of the terminal deviates from the assumed location by more than a first threshold, and the actual location of the terminal is on the side of the first cell of the coverage boundary and remote from the coverage boundary by at least a second threshold;preventing the terminal from performing the handover if at least one of the one or more checked conditions is fulfilled.

In a non-terrestrial network (NTN), a user equipment (UE) may be configured to transmit location information associated with the UE to a source NTN entity. The UE may be further configured to perform a handover procedure from the source NTN entity to a target NTN entity after transmitting the location information to the source NTN entity. The UE may be further configured to refrain from transmitting the location information to the target NTN entity before completion of the handover procedure. The source NTN entity may be configured to receive UE location information, and transmit a message associated with handover of the UE to a target NTN entity, the message including information that is based on the UE location information.