271 results about "Handover procedure" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

The present application relates to a method and an apparatus for performing a handover procedure. One embodiment of the subject application provides a method, which includes: receiving a configuration signaling including first configuration information or second configuration information; determining a first target primary cell (PCell) based on the configuration signaling; and performing a handover procedure to the first target PCell.

A method for a user equipment (UE) is provided. The method includes the UE maintaining a first Radio Resource Control (RRC) connection with a first base station (BS) of a first network while receiving transmissions from a BS of a second network during at least one time 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 second BS of the first network. The second command controls usage of the switch gap configuration by the UE. The UE initiates the handover procedure according to the first command. The UE may suspend reception of transmissions from the BS of the second network following completion of the handover procedure based on the second command.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may detect one or more triggering conditions indicating that the UE is traveling along the route, and should enter the high mobility operating mode to improve mobility procedure performance or processor performance. Upon entering the high mobility operating mode, the UE may perform mobility procedures, handover procedures, cell selection or reselection, or connection procedures. For example, the UE may determine which cell it is approaching, and which cell it is leaving, along the route, which may allow the UE to avoid being assigned to handover to a cell that it is leaving, prioritize or deprioritize measurement reports for UEs that the UE is leaving or approaching, update the contents or timing of measurement reporting, or the like.

Methods, systems, and devices for wireless communications are described. In some examples, a network entity may send a capability message indicating support for multi-modal services associated with user equipments (UEs). The network entity may receive a message indicating a configuration for a multi-modal service of the multi-modal services and communicate in accordance with the multi-modal services. In another example, a network entity may transmit an indication of a cell set to a set of UEs for handover procedures. A UE may initiate a handover to a target cell and the network entity may transmit a handover command to the set of UEs. In another example, a network entity may transmit an indication of cell set to a set of UEs for cell switching. A UE may transmit a report of a target cell and the network entity may transmit a cell switch command and a cell switch notification.

Embodiments of the present disclosure provide methods and apparatuses for handover. A method at a first access and mobility management entity comprises obtaining at least one authentication and authorization status for a terminal device for at least one network slice of a network. The method further comprises sending the at least one authentication and authorization status for the terminal device for at least one network slice of the network to a second access and mobility management entity during a handover procedure.

A system and method for power headroom reporting (PHR) during a Dual Activity Protocol Structure (DAPS) handover procedure. The system and method include receiving, by a wireless communication device, a handover command to begin a dual activity protocol structure (DAPS) handover; detecting, by the wireless communication device during the DAPS handover, a condition for power headroom reporting (PHR); and performing, by the wireless communication device during the DAPS handover, the PHR.

Aspects of the disclosure relate to techniques for slice aware mobility by facilitating slice specific user equipment (UE) measurement procedures and slice specific handover procedures for ongoing network slices of the UE. A network entity may configure a measurement report for the UE including one or more slice specific parameters. The UE may use the slice specific parameters to generate a measurement report including signal quality measurements of a serving cell and / or neighbor cells. The network entity may further identify candidate target cells for a handover based on the ongoing network slices of the UE and slice supporting capability information indicating neighbor cell(s) that support the ongoing network slices.

A wireless terminal of a cellular telecommunication system communicates with a first cell served by a mobile base station relay. The wireless terminal comprises receiver circuitry and processor circuitry. The receiver circuitry is configured to receive, from the first cell, a reconfiguration message comprising second cell information including a cell identity and an operating frequency of a second cell and an indication indicating whether or not the first cell will be replaced by the second cell. The processor circuitry is configured to: (1) perform, based on the reconfiguration message, a handover procedure to handover to the second cell, and (2) perform a cell selection procedure in a case that the handover procedure fails. During the cell selection procedure, the first cell is not considered as a candidate in a case that the indication indicates that the first cell will be replaced by the second cell.

This invention relates to a method comprising: receiving, by a wireless device from a node, one or more parameters indicating measurement gaps; performing a measurement on a reference signal during a first measurement gap of the measurement gaps; determining, using the measurement, a predicted measurement of the reference signal in a second measurement gap of the measurement gaps; during a predicted time, determining whether the predicted measurement indicates a predicted link failure; and in response to determining that the predicted measurement indicates the predicted link failure, perform one or more resulting actions, wherein the one or more resulting actions may include: skipping the second measurement gap of the measurement gaps during the predicted time; transmitting, to the node, one or more messages indicating skipping of the second measurement gap of the measurement gaps or communicating with a base station during the second measurement gap; switching to a pre-configured backup link to maintain connectivity; reducing transmission power to minimize self-interference while maintaining the ability to receive signals; adapting communication parameters logging the predicted link failure event and determined resulting action and reporting the predicted link failure and resulting action, switching to IDLE / INACTIVE state, starting a cell (re)selection procedure, and / or performing a handover procedure.

A method may include receiving, by a wireless device and via a first cell, a layer 1 / layer 2 trigger mobility (LTM) cell switch command indicating an LTM cell switch to a second cell and a random access channel (RACH)-less LTM cell switch to the second cell. The method may also include applying, after a time duration from a transmission occasion of a physical uplink control channel (PUCCH) for the LTM cell switch command, a first TCI state to the second cell. The time duration is based on a radio resource control (RRC) processing time; and synchronization signal block (SSB) measurement window for receiving, from the second cell, a first SSB transmission using the first TCI state. The method may also include transmitting, via the second cell, first uplink transmissions using the first TCI state until the wireless device receives an activation command indicating a second TCI state.

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.

Procedures, methods, architectures, apparatuses, systems, devices, and computer program products directed to control throughput performance. In an embodiment, a method, implemented in a wireless transmit / receive unit (WTRU), comprises receiving, from a network, a measurement configuration information comprising target cells to be measured and a conditional event configuration information for triggering a CHO command; monitoring the current radio conditions of target and serving cells; performing prediction of the radio conditions of target and serving cells; and in response to current radio conditions of a target cell and / or serving cell fulfilling one or more associated radio condition threshold(s) and in response to the predicted radio conditions of a target and / or serving cell fulfilling one or more associated radio condition, executing the CHO command.

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.

Embodiments described herein relate to methods and apparatus for enabling performance of actions related to a first secondary cell group upon performance of Layer 1 (L1) / Layer 2L2 triggered mobility cell handover. A method performed by a user equipment communicating with a source node in a primary cell group (MCG) includes performing a Layer 1 / Layer 2 Inter Cell Mobility (LTM) cell handover procedure from the source node to a target node; and performing one or more actions related to the first secondary cell group after or during performing the LTM cell handover procedure.

Various aspects of the present disclosure generally relate to wireless communication. A user equipment (UE) may receive, from a source network node, information associated with a handover from the source network node to a target network node. The UE may transmit, to the target network node after the handover from the source network node to the target network node, information associated with a protocol data unit (PDU) in a set of PDUs scheduled for transmission to the UE based on a timer associated with the PDU and a request for the target network node to discard a first subset PDUs of the set of PDUs based on the information associated with the PDU. The UE may receive, from the target network node, a second subset of PDUs of the set of PDUs based at least in part on the information. Numerous other aspects are described.