175 results about "Roaming" patented technology

The invention belongs to the technical field of wireless information transmission, and provides a single link roaming switching device and method based on double wifi chip STA equipment, the technical scheme is that a communication link is established between a first network card and an AP, and a second network card is used for monitoring link state data of the first network card; the controller is configured to evaluate the channel quality of a current channel according to the link state data of the first network card acquired by the second network card, predict the time when the change rate is changed to be less than a signal quality threshold according to the change rate of the channel quality, and perform roaming when the predicted time is less than a time threshold; when it is detected that roaming is needed, the second network card is controlled to start to send the same content as the first network card, candidate APs in the network are scanned at the same time, a target AP is selected in a self-adaptive mode according to the channel quality, obtained through calculation, of the candidate APs, and the first network card is controlled to select the target AP to establish a link. The effective utilization of bandwidth is improved, and the probability of air interface data conflict is reduced.

Embodiments described herein allow for the improvement of roaming in a multi-link and / or multi-access point (AP) environment. The needs of a wireless device or applications operating on the wireless device can dictate what types of connections are desired. These needs can be encapsulated within an objective function, which can dictate an overall roaming strategy associated with a network device or associated application. This objective function can allow for various APs to suggest, or wireless network devices to request, different target roaming AP candidates based on an implicit or explicit criteria. This criteria can be focused on maximizing throughput, or minimizing loss, or a specific combination of other needs. The objective function can be determined by the wireless network device, the AP, or a remote device such as a wireless local area network controller, or cloud-based network management service. The objective function can also be dynamically adjusted based on subsequent events.

The invention provides a projection transformation method for hexahedral panoramic data to spherical panoramic data, and the method achieves the seamless splicing of panoramic images of six surfaces of a cube and the mapping of the panoramic images to a spherical coordinate system through the determination of a direction vector, the normalization of the vector, the conversion of spherical coordinates, the projection to an equidistant histogram, and an illumination and color correction algorithm. The problems of splicing gaps, deformation, texture distortion and the like in a traditional method are solved. The method is not only widely applied to the fields of virtual reality, augmented reality, panoramic video production and the like, but also greatly expands the application scenes, including but not limited to panoramic roaming, streetscape roaming experience, integrated use of specific roaming plug-ins, seamless embedding on a map platform and the like, and has wide application prospects. Therefore, the display effect of the panoramic data and the immersive experience of the user are remarkably improved.

The invention provides a coal stockpiling method based on thermal power intelligent coal transportation, which comprises the following steps that: coal storage yard acquisition equipment acquires three-dimensional point cloud, surface texture, space coordinates, material identity and stacker-reclaimer attitude data of a coal pile, and transmits the data to an edge server through an optical fiber wireless redundant network; preprocessing the data to generate a coal seam three-dimensional digital twinborn model containing a spatial position, a component label and stacking time, and supporting virtual roaming; basic information and constraint conditions are input, a stacking plan is generated based on an optimization algorithm, and an operation instruction is generated after verification; the stacker-reclaimer receives the instruction, completes stacking according to track planning through the PLC control system and records data; the digital twin platform monitors the process, automatically alarms when abnormity occurs, updates the inventory in combination with an inventory making algorithm, and generates a report; the stacking effect is evaluated every day, algorithm parameters of the next round are optimized, and closed-loop management is formed. According to the method, the intelligence and accuracy of coal stacking are improved, and efficient operation of the thermal power coal conveying system is guaranteed.

A roaming application in a core network receives a request to create a temporary roaming profile for a roaming user in the mobility management entity (MME) in response to a roaming pass being purchased by the roaming user for a user equipment (UE), stores, in the MME, the temporary roaming profile for the roaming user, wherein the temporary roaming profile includes an identity of the UE and an access point name (APN) associated with the roaming network, receives an attach message from the UE when the UE is located within a coverage area of the roaming network, wherein the attach message includes the identity of the UE, and creates a bearer between the UE and a packet network data gateway (PGW) of the roaming network based on the APN associated with the roaming network indicated in the temporary roaming profile for the roaming user.

The technology makes wireless roaming decisions for a computing device. The device is configured to determine whether to consider roaming and to generate a roam reason. The device determines a quality score for at least one access point within a wireless communication range of the device based at least in part on the roam reason. A target access point with a highest quality score is selected. The device may then determine to roam to the target access point, if the target access point is not the current access point to which the device is connected.

The invention relates to the technical field of computers, and discloses a visual operation and maintenance supervision platform based on a digital twinning technology, and the platform comprises a data preprocessing module which is used for preprocessing a multi-source heterogeneous monitoring data flow; the data fusion module is used for constructing an equipment topological relation graph, extracting an initial feature vector set of equipment nodes and carrying out space-time fusion; the digital twin modeling module is used for performing parametric modeling and semantic annotation; the real-time synchronization module is used for extracting a model updating instruction set and carrying out asynchronous message transmission and parallel updating; the anomaly detection module is used for training an anomaly detection model and analyzing anomaly types and anomaly reasons; the root cause tracing module is used for constructing an associated sub-graph of abnormal equipment, predicting a root cause candidate equipment list and carrying out hybrid reasoning and evidence fusion; the visual presentation module is used for visualizing a fault influence range, dynamically displaying network traffic and performing multi-view roaming and information drilling; according to the invention, the fault positioning efficiency and the operation and maintenance management level are improved.

The invention discloses a multi-channel video data synchronous display method based on a three-dimensional real scene, and the method comprises the following steps: firstly, carrying out the alignment of audio features and timestamp synchronization, carrying out the alignment through extracting the audio features of a plurality of channels of videos, embedding a unified timestamp in a video stream, and distributing the video streams with different code rates in combination with a multicast protocol; the terminal selects the adaptive stream for synchronous playing according to the decoding capability; through dynamic fusion of the three-dimensional live-action model and multiple paths of videos, dispersed two-dimensional monitoring images are integrated into a continuous three-dimensional panoramic view, and 360-degree multi-view browsing and automatic roaming are supported. And meanwhile, a three-dimensional GIS (Geographic Information System) technology is combined, a target area is quickly positioned based on geographic coordinates, a virtual-real synchronous digital twinborn scene is constructed, and three-dimensional visual monitoring is realized. Therefore, the problems of space-time dislocation, view angle splitting, terminal adaptation difference and the like of multiple paths of videos in a three-dimensional real scene are solved, and high-precision and low-delay virtual-real fusion dynamic display is realized.

The invention discloses a Wi-Fi roaming control method, electronic equipment and a computer readable storage medium, relates to the technical field of terminals, and aims to reduce the number of times of Wi-Fi roaming and realize escape in a Wi-Fi roaming ping-pong scene by prohibiting part of roaming strategies in various Wi-Fi roaming strategies, thereby ensuring the internet surfing experience of a user. The method can be applied to the electronic equipment supporting multiple Wi-F i roaming strategies, and the electronic equipment is accessed to a Wi-Fi network. The specific scheme is as follows: the electronic equipment generates Wi-Fi roaming between two different BSSI D; and executing an escape strategy in response to the fact that Wi-Fi roaming of the electronic equipment meets a preset condition. Wherein the escape strategy includes forbidding the electronic device to perform Wi-Fi roaming based on the first roaming strategy.

This disclosure relates to methods for retrieving buffered downlink data from an origin access point while roaming in a wireless local area network system. A non-access point wireless device can initiate from a first access point to a second access point. The non-access point wireless device can receive an indication that roaming from the first access point to the second access point is ready. The non-access point wireless device can receive downlink data from both the first access point and the second access point after the roaming from the first access point to the second access point is ready.

Aspects of the present disclosure are directed to techniques for a light-weight roaming protocol in a Multi-Link Operation wireless network. In one aspect, a method includes detecting a roaming point, wherein the roaming point is an event that triggers a user equipment to switch connectivity from a first access point to a second access point, and the user equipment, the first access point, and the second access point operate as multi-link devices. The method further includes maintaining, by the first access point, transmission of downlink data to the user equipment after the roaming point until one of a plurality of conditions occurs; and discarding uplink traffic from the user equipment.

A user equipment may be associated with a guaranteed quality-of-service with respect to a home network. The user equipment may request connection establishment with a terrestrial radio network node corresponding to the home network. The home terrestrial node may configure the user requirement with a roaming priority level, a user equipment priority class corresponding thereto, or an identifier associated with a non-terrestrial radio network node corresponding to a network other than the home network. The home terrestrial node may configure the non-terrestrial node with the user equipment priority class. Upon roaming into signal coverage corresponding to the non-terrestrial node, the user equipment may establish a connection therewith, based on the priority class, that facilitates communicating according to the guaranteed quality-of-service. If connection establishment with the non-terrestrial node fails, the user equipment may establish connection with a roaming terrestrial node based on a roaming priority level indication broadcast thereby.

Make-before-break roaming may be provided. A first packet and a second packet may be created. The first packet and the second packet may comprise replicants of one another. The first packet and the second packet may comprise a sequence number. The first packet may be received by a first link and the second packet may be received by a second link. The first packet may be forwarded from the first link and the second packet may be forwarded from the second link.

The invention relates to the technical field of human-computer interaction, discloses a method and a device for realizing writing roaming and zooming on a Qt platform, and aims to solve the problems of poor writing continuity and poor zooming visual consistency of existing intelligent equipment during finger writing. According to the scheme, the method mainly comprises the steps that unified overall scaling of all graphic items is achieved by operating viewport transformation of QGraphics View; meanwhile, based on the coordinate increment of multi-finger sliding, setSceneRect is dynamically called to expand the QGraphicsScene boundary, and a centerOn method is utilized to synchronously adjust the viewport center, so that continuous and smooth roaming of the viewport following the fingers is realized. Overall zooming and intelligent roaming are coordinated to jointly construct a virtual writing interface which can be extended infinitely and is synchronous in zooming, so that the writing continuity of finger writing and zooming visual consistency are improved, and the method is particularly suitable for application scenes such as large-screen teaching and digital signature.

The invention relates to a coal mine monitoring data visualization method and system, and aims to solve the problems that the existing two-dimensional monitoring system is split in data presentation, lacks spatial relevance and is low in emergency disposal efficiency, the underground multi-modal monitoring data is collected and preprocessed in real time, a three-dimensional space model fusing geological information and a roadway network is constructed, and the real-time monitoring of the underground multi-modal monitoring data is realized. The method comprises the following steps of: processing data, dynamically mapping the processed data to corresponding sensor space coordinates in a model, representing real-time data by utilizing a dynamically changeable visual data identifier, and realizing visual angle control, roadway roaming, click query and historical data backtracking through a man-machine interaction instruction; multi-dimensional alarm and focusing display is automatically triggered, a collaborative analysis view is generated, and a historical trend, peripheral data and an equipment control interface are displayed in a linkage manner, so that data exceptions are placed in spatial and logical contexts of the data exceptions for comprehensive analysis. According to the invention, the intuition, situation awareness and intelligent decision-making level of coal mine safety monitoring are obviously improved.

The invention relates to the field of computer graphics and real-time rendering, and discloses a naked eye VR visual angle continuous roaming real-time tracking system, which comprises a multi-source viewpoint acquisition unit, a rendering feedback prediction unit connected with a depth buffer area and a template buffer area, and a viewport consistency arbitration unit. According to the method, motion vectors are purified according to object attributes of a template buffer area, a viewpoint is reversely deduced by means of data hierarchical solution of a depth buffer area, and a viewport consistency arbitration unit compulsively uses the reversely deduced viewpoint to take over rendering when the deviation of external sensing data exceeds a limit. The image visual residual inertia is used for filling the blank of external sensor data, and rendering collapse caused by sensor signal interruption or asynchronization is avoided.

Devices, networks, systems, methods, and processes for performing Ultra-Wideband (UWB) ranging to select the next optimal AP for Wi-Fi roaming are provided herein. In order to perform the UWB ranging, a client device may receive an action frame from an AP with which the client device is currently associated. The action frame may indicate the client device to perform UWB validation to one or more neighboring APs of the AP. Further, the client device may perform, based on the action frame, the UWB ranging to the neighboring APs. Furthermore, the client device may select, based on the UWB ranging, the next optimal AP among the neighboring APs that enables the client device to maintain a stable connection with a network while the client device performs the Wi-Fi roaming. Accordingly, the client device may not suffer from connection failures or connection delays while the client device performs the Wi-Fi roaming.

A calling method includes: a first CSCF device receiving a first communication message containing first call signaling, where the initiator / calling party or the recipient / called party of the first call signaling is a roaming user equipment of the first CSCF device; and the first CSCF device routing the first call signaling to a roaming AS of the roaming user equipment based on the first communication message. The roaming AS is an AS in the home area of ​​the first CSCF device that is capable of providing value-added call services to the user equipment. This method can improve resource utilization of the roaming AS and enhance the service experience of roaming users.

The invention discloses a virtual reality roaming method and system based on a multi-view panoramic image model, and belongs to the technical field of computer vision and virtual reality. Through a multi-viewpoint panoramic image set, real-time generation of a high-quality panoramic image from a known viewpoint to any unknown viewpoint is realized based on a spherical projection viewpoint transformation algorithm. Modeling generation methods for a road scene and a region scene are respectively designed according to scene feature differences, so that scene representation with complete coverage is constructed. According to the system, adjacent viewpoints are quickly positioned through a spatial index mechanism, geometric mapping and multi-viewpoint weighted fusion are performed by using the spherical projection algorithm, and a smooth and continuous free viewpoint roaming picture is rendered in a virtual reality environment. According to the method, on the premise of ensuring high fidelity of the scene, real-time rendering is realized on common consumption-level hardware, and the coherence and the degree of freedom of immersive interactive experience are improved.

In some implementations, a device in a first public land mobile network (PLMN) may receive a request for services with a network function producer (NF-P) in the first PLMN, wherein the request for services includes a first token that is associated with a network function consumer (NF-C) in a second PLMN. The device may validate the first token using a signing certificate associated with a signer of the first token. The device may transmit the request for services to the NF-P, wherein the request for services includes a second token that is based on a successful validation of the first token, and a successful validation of the second token enables the NF-P to provide a service to the NF-C based on an authorization of the NF-C during an inter-PLMN roaming.

Embodiments of a method and apparatus for wireless communications are disclosed. In an embodiment, a wireless device includes a controller configured to generate Seamless Mobility Domain (SMD) capabilities information of an SMD and a transceiver configured to transmit the SMD capabilities information to a second wireless device for wireless roaming within the SMD.

The invention discloses a cloud rendering method and system for space computing and terminal equipment, and belongs to the technical field of cloud computing and virtual / augmented reality. The method aims at solving the technical problems that an existing space computing device cannot run severe applications due to limitation of local computing power, power consumption and heat dissipation, and application ecology is separated from a traditional two-dimensional desktop. The method comprises the following steps: operating an operating system environment capable of bearing two-dimensional and three-dimensional applications on a cloud server, performing real-time synthesis and rendering on the output of each application in a three-dimensional virtual space, and updating a scene according to user interaction data received from terminal equipment, and the generated three-dimensional scene is transmitted to terminal equipment in a streaming manner by adopting an optimized coding technology. The method has the beneficial effects that a core computing task is arranged at the cloud end, so that a user can obtain top-level workstation performance through light-weight terminal equipment, various professional applications can be seamlessly operated, persistence and cross-equipment roaming of a working space are realized, and the productivity value of space computing is greatly improved.

The invention relates to the technical field of computer networks, in particular to a wireless terminal roaming method and device based on a PON network, computer equipment and a storage medium. In addition, the wireless terminal roaming method based on the PON network can also be applied to fiber to room (FTTR), enterprise level fiber to room (FTTR-B) and broadband fusion terminal products. The method comprises the following steps: performing received signal strength scanning in response to a received signal strength scanning request from a current access point to obtain a scanning received signal strength indication value of the access point, obtaining a first actual received signal strength indication value for data transmission with the current access point, and determining a scanning compensation value according to the difference between the two values. Further correcting the scanning received signal strength indication values of other access points; the first actual received signal strength indication value and the scanning received signal strength indication correction values of the other access points are used for the current access point to determine a target access point to which the wireless terminal needs to be switched.

A system and method for generating a pairwise transient key security association (PTKSA) is provided, including providing a first media access control (MAC) address shared by a plurality of access points (APs), the first MAC address corresponding to an infrastructure including the plurality of APs, and each AP of the plurality of APs having a respective AP MAC address; providing the second MAC address to a station (STA); and establishing a secure link between the STA and the infrastructure using the first MAC address and the second MAC address to derive a pair-to-pair transmission key (PTK) for the secure link, where the secure link is between one or more of the plurality of APs and the STA.

This application provides a roaming method, apparatus, and device. The method includes: a first access point receiving a first frame sent by a station, the first frame being used to request the first access point to provide roaming-related information of a plurality of candidate access points or roaming-related information of a target access point, wherein the first frame includes first indication information and / or second indication information, the first indication information being used to indicate whether it is necessary to collect roaming-related information of access points in a listening state, and the second indication information being used to indicate whether it is necessary for the first access point to switch from a listening state to a wake-up state; the first access point sending a second frame to the station, the second frame including roaming-related information of a plurality of candidate access points, or the second frame including roaming-related information of a target access point, the target access point being selected from a plurality of candidate access points.

A controller-based roaming method includes determining, by a station, whether to block an access point; sending, by the station, a block report of the access point to a wireless access controller; maintaining, by the wireless access controller, a block list according to the received block report; and performing, by the wireless access controller, roaming control for the station according to the block list and signal statuses reported by a plurality of access points.

This disclosure provides methods, components, devices and systems for authentication techniques for seamless roaming. Some aspects relate more specifically to techniques for a non-access point (AP) device to prepare the second security key and transition the non-AP device to a target AP multi-link device (MLD) via communications with the serving AP MLD, with the target AP MLD, or both. In some aspects, the target AP MLD may perform validation based on information from the non-AP device or based on communicating with a previous serving AP MLD. In some aspects, a network may initiate roaming by indicating for the non-AP device to roam from a serving AP MLD to one or more target AP MLDs. The non-AP device may identify a timer associated with performing the roaming, and may accept or reject the request to perform the roaming within a duration of the timer.

The embodiments of the present disclosure provide a terminal roaming method, a storage medium, and an electronic device. A first terminal device is configured to: communicate with a network by using a first PTK; transmit to the network a first request message for roaming preparation, and receive first response information from the network for a roaming response; and, communicate with the network by using a second PTK.

A System and method for selecting a Serving Gateway User Plane / Intermediate User Plane Function / User Plane Function (SGW-U / I-UPF / UPF) for a mobile device in a visited network node where a roaming or a non-roaming status for the mobile device is determined, an Access Point Name (APN) / Data Network Name (DNN) for the mobile device is determined, where a Serving Gateway Control Plane / Session Management Function (SGW-C / SMF) node selects a first SGW-U / I-UPF / UPF or a second SGW-U / I-UPF / UPF for the mobile device based on the determination of the mobile device being in a roaming or a non-roaming status.

The application provides a method and device for realizing wireless roaming, and relates to the technical field of wireless communication roaming, which comprises the following steps: S1, detecting and obtaining roaming information of each wireless terminal connected to an access point (AP); the roaming information comprises 802.11kvr roaming information of the wireless terminal; S2, determining the device type of each wireless terminal and the roaming attribute supported by the device type of each wireless terminal according to the 802.11kvr roaming information of each wireless terminal; S3, creating a standby access point (AP) according to the device type of each wireless terminal, wherein the standby AP has the same configuration and service as the original AP, determining the roaming attribute supported by the standby AP according to the device type of each wireless terminal, and selecting whether to start the roaming function of the standby AP, wherein the roaming function comprises 802.11kvr roaming function; S4, switching to use the original AP or the standby AP during the roaming process of the wireless terminal according to the device type of each wireless terminal.