19 results about "Fast handover" patented technology

An apparatus comprising: means for receiving, by a handover source access node from one or more handover candidate target access nodes, one or more default radio resource control (RRC) configurations comprising default RRC configuration information for a handover; means for receiving, from multiple UEs, a measurement report comprising information on a radio service quality in association with the handover source access node and / or at least one radio cell provided by the one or more handover candidate target access nodes; means for determining, by the handover source access node, to carry out the handover of the multiple UEs to at least one of the one or more handover candidate target access nodes based on the measurement report, and that the handover is a conditional handover based on service delay requirements and / or service reliability requirements; means for transmitting handover commands to the multiple UEs, wherein each of the handover commands comprises a condition for carrying out the conditional handover and a handover radio network temporary identifier (RNTI) in association with the multiple UEs as a group; and means for transmitting a multi-cast message comprising the default radio resource control configuration information to the multiple UEs using the handover RNTI.

A method is provided that comprises receiving, from handover candidate target access node(s), default radio resource control configuration(s) comprising default radio resource control configuration information for a handover. The method comprises receiving, from multiple user equipments (UEs), a measurement report. The method comprises determining to carry out the handover as a conditional handover of the multiple UEs to at least one of the handover candidate target access node(s) based on at least one of the measurement report(s), service delay requirements or service reliability requirements. The method comprises transmitting handover commands to the multiple UEs, wherein each of the handover commands comprises a condition for carrying out the conditional handover and a handover radio network temporary identifier (RNTI) in association with the multiple UEs as a group. And the method comprises transmitting a multi-cast message comprising the default radio resource control configuration information to the multiple UEs using the handover RNTI.

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive a handover command indicating that the UE is to perform a handover procedure to a bandwidth portion (BWP) of a target cell. The UE may identify that a first set of synchronization signal block (SSB) measurement metrics associated with the BWP are not available for the handover procedure, and identify that a second set of SSB measurement metrics associated with the target cell and a third set of SSB measurement metrics associated with the target cell are available for the handover procedure. The UE may select one of the second set of SSB measurement metrics or the third set of SSB measurement metrics, and perform a handover procedure using the selected set of SSB measurement metrics. Numerous other aspects are described.

Various example implementations relate to methods and apparatuses for network slice based conditional fast handover An apparatus may be configured to receive, from a source network element, a message in association with a conditional handover for conditional handover to one or more candidate target cells supported by one or more target network elements, wherein the message comprises a baseline configuration of the one or more candidate target cells, at least one triggering condition for the conditional handover to the one or more candidate target cells, and one or more network slice specific configurations associated with one or more network slices supported at the one or more candidate target cells. The apparatus may be configured to evaluate the triggering condition and the slice specific configurations to select at least one target cell of the one or more candidate target cells for the conditional handover. And the apparatus may be configured to initiate a random access procedure to establish a radio resource connection with the selected at least one target cell.

The embodiment of the application discloses a method for fast switching failure recovery, a terminal device and a chip. The terminal device configures a first timer according to a reconfiguration message. After detecting a radio link failure, if the number of cells in a cell trigger list cellsTriggeredList corresponding to a measurement identifier measId configured with the first timer in a measurement report list VarMeasReportList is not 0, the first timer is started. If the first timer is timed out, RRC connection reconstruction is triggered.

Various example embodiments relate to apparatuses and methods for fast handover and conditional fast handover of user equipment without a pre-allocated C-RNTI An apparatus may be configured to receive a message in association with a handover from a handover source access node, the message comprising a cell-specific baseline configuration for a handover of user equipment to a target cell and a handover identifier assigned to the user equipment, to initiate a random-access procedure to the target cell according to the cell-specific baseline configuration, to transmit a reconfiguration complete message comprising the handover identifier to the handover target access node during the random-access procedure, and to receive a message comprising a supplementary configuration for the user equipment and a cell radio network temporary identifier assigned to the user equipment from the handover target access node.

A vehicle-to-everything (V2I) authentication key exchange protocol and a fast switching authentication method thereof include the following steps: step one, the system selects and sets elliptic curve parameters for authentication and encryption, and configures the hardware security module of each node and the trusted platform module of the vehicle; step two, the vehicle and the driver's information are securely registered in the system, the vehicle registers its real identity by generating a unique public-private key pair and registering with the trusted authority center (TA), the TA generates a pseudo identity of the vehicle after verification and sends it back to the vehicle through a secure channel; step three, the RSU generates and registers its unique identity with the TA, the TA generates the relevant authentication information of the RSU after verification and stores it in the block chain; step four, the initial authentication and key exchange between the vehicle and the RSU are completed; and step five, the switching authentication with the new RSU is completed. The application has the characteristics of high efficiency, low calculation cost and communication overhead, strong security and privacy protection.

Embodiments of the present application relate to the technical field of communications, and disclose a communication method and a communication device, capable of supporting the handover of a terminal from a non-terrestrial cell to a terrestrial cell, and capable of reducing the handover duration and energy consumption of the terminal. In the method, information about a first network element of a terrestrial PLMN which a terminal is allowed to access can be indicated; the first network element can provide terrestrial cell information covering area information or location information of the terminal, wherein the terrestrial cell information is used for enabling the terminal, upon entering a coverage area of any terrestrial cell, to hand over or reselect from a non-terrestrial cell to the terrestrial cell. In this way, when neighboring cell information cannot be configured between a non-terrestrial network and a terrestrial network, fast handover of a terminal from a non-terrestrial cell to a terrestrial cell is supported, and the need for the terminal to frequently perform frequency search is eliminated, thereby reducing energy consumption of the terminal.

Embodiments of the present application relate to the technical field of communications, and disclose a communication method and a communication device, capable of supporting the handover of a terminal from a non-terrestrial cell to a terrestrial cell, and capable of reducing the handover duration and energy consumption of the terminal. In the method, information about a first network element of a terrestrial PLMN which a terminal is allowed to access can be indicated; the first network element can provide terrestrial cell information covering area information or location information of the terminal, wherein the terrestrial cell information is used for enabling the terminal, upon entering a coverage area of any terrestrial cell, to hand over or reselect from a non-terrestrial cell to the terrestrial cell. In this way, when neighboring cell information cannot be configured between a non-terrestrial network and a terrestrial network, fast handover of a terminal from a non-terrestrial cell to a terrestrial cell is supported, and the need for the terminal to frequently perform frequency search is eliminated, thereby reducing energy consumption of the terminal.

Described herein is a source network node configured for supporting an inter-node handover procedure involving at least one target network node and a user equipment (UE) served by the source network node, the source network node comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the source network node at least to: obtain, from the target network node, a baseline radio resource control (RRC) configuration comprising configuration information usable by the UE to be handed over and connected to the target network node and information indicative of at least one criterion for executing the inter-node handover procedure; determine whether to execute the inter-node handover procedure based on the criterion; and based on determining that the criterion is met: generate a handover command message based on the baseline RRC configuration; and transmit, to the UE, the handover command message for enabling the UE to be connected to the target network node.

An optical wireless communication system, a method and an apparatus for use in an optical wireless communication system, which enables data communication, e.g. LiFi, and wherein fast switching can be achieved by having neighboring access points (AP1, AP2) announce themselves using very short frames, which are picked up by a user equipment (EP1) detecting the identity of the neighbor access point (AP2) and then communicating it to the current access point (AP1) to share information about the user equipment (EP1) with its neighbor access point (AP2) so that the neighbor access point (AP2) can be preconfigured to allocate resources and / or synchronize.

Various example embodiments relate to apparatuses and methods for fast handover and conditional fast handover of user equipment. An apparatus may be configured to receive a message comprising cell-specific baseline configurations and execution conditions for a conditional handover from a source access node, the cell-specific baseline configurations comprising a default signaling radio bearer configuration, determine information on radio link quality of a source cell and one or more candidate target cells, select at least one target cell from the one or more candidate target cells based on the execution conditions and the determined information on radio link quality, initiate a random-access procedure to the selected at least one target cell based on the cell-specific baseline configuration, and transmit a reconfiguration complete message on a signaling radio bearer indicated in the default signaling radio bearer configuration to the at least one handover target access node during the random-access procedure.

In one embodiment, a plurality of communication paths for communication between a user equipment (UE) and a wireless communication network are first established, and then switching between the paths is initiated. Comprising an explicit indication that the UE is to switch between the plurality of communication paths is sent to and received by the UE at least having established the plurality of communication paths. Communication is switched between the communication paths in response to the explicit indication. At least one of the communication paths includes a relay path between the UE and the wireless communication network through another UE. Establishing the plurality of paths prior to the handover may facilitate fast handover with low latency and / or no traffic loss.

A user equipment may be configured to adjust a configured handover offset criterion to facilitate handover from a terrestrial radio network node to a non-terrestrial radio network node. The adjusted handover offset criterion may facilitate the user equipment being handed over to the non-terrestrial node when a difference between reference signal strengths corresponding to the non-terrestrial node and the terrestrial node equals or exceeds the adjusted handover offset, which may be less than the configured unadjusted handover offset criterion. The terrestrial node may communicate, via backhaul communication links, with the non-terrestrial node or a non-terrestrial network element, to obtain non-terrestrial downlink resource and beam information usable by the user equipment to receive connection establishment setup information. The terrestrial node may transmit the non-terrestrial downlink resource and beam information and a timing advance value to the user equipment for use thereby in receiving connection establishment setup information from the non-terrestrial node.

Various example embodiments relate to apparatuses and methods for fast handover and conditional fast handover of user equipment An apparatus may be configured to receive, by a user equipment from a handover source access node, a message in association with a handover comprising a cell-specific baseline configuration for a handover of the user equipment to a target cell provided by a handover target access node, the cell-specific baseline configuration comprising a default signaling radio bearer configuration, to initiate a random-access procedure to the target cell to establish a radio resource control connection between the user equipment and the handover target access node based on the cell-specific baseline configuration, and to transmit a reconfiguration complete message on a signaling radio bearer indicated in the default signaling radio bearer configuration to the handover target access node during the random-access procedure.

A method is provided that comprises receiving, from handover candidate target access node(s), default radio resource control configuration(s) for a handover. The method comprises receiving, from user equipment(s), a measurement report comprising information on a radio service quality in association with at least one radio cell provided by the handover candidate target access node(s). The method comprises determining, by a handover source access node, to carry out the handover of the user equipment(s) to at least one of the handover candidate target access node(s) and whether the handover is a conditional handover based on at least one of the information on the radio service quality, service delay requirements or service reliability requirements. And the method comprises transmitting a handover command to the user equipment(s), wherein, in the case the handover is the conditional handover, the handover command comprises a condition for carrying out the handover.

A method of conditional handover (CHO) comprising receiving, by a handover (HO) source node from a HO candidate node, a default radio resource control (RRC) configuration comprising default RRC information for a HO; receiving, from a user equipment (UE), a measurement report comprising information on a radio service quality in association with the HO source node and / or with at least one radio cell provided by the HO candidate node; determining, by the HO source node, to carry out the HO of the UE to the HO candidate based on the measurement report, wherein the HO is a conditional fast HO based on service delay requirements and / or service reliability; transmitting a conditional fast HO command to the UE wherein the command comprises the default RRC configuration. The conditional fast HO command may comprise a cell radio network temporary identifier (C-RNTI) selected from a pool of C-RNTIs from HO candidate nodes.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a handover command indicating that the UE is to perform a handover procedure to a bandwidth part (BWP) of a target cell. The UE may identify that a first set of synchronization signal block (SSB) measurement metrics associated with the BWP is not available for the handover procedure and that a second set of SSB measurement metrics associated with the target cell and a third set of SSB measurement metrics associated with the target cell are available for the handover procedure. The UE may select one of the second set of SSB measurement metrics or the third set of SSB measurement metrics and perform the handover procedure using the selected set of SSB measurement metrics. Numerous other aspects are described.