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260 results about "ControlNet" patented technology
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ControlNet is an open industrial network protocol for industrial automation applications, also known as a fieldbus. ControlNet was earlier supported by ControlNet International, but in 2008 support and management of ControlNet was transferred to ODVA, which now manages all protocols in the Common Industrial Protocol family.
System and method for fast precise measurement and total factor data acquisition of high speed railway
InactiveCN101913368AGuaranteed safe operationMeasuring points markingRailway auxillary equipmentMeasurement deviceData acquisition
The invention relates to the field of precise railway measurement, high speed railway rail detection and security and digital railway, in particular to a system and a method for carrying out movable precise measurement of the high speed railway and synchronously obtaining total factor data along the line of the railway on the basis of GPS (Global Positioning System) / IMU (Inertia Measurement Unit) positioning and orientation, laser scan and digital imaging technologies. The invention further relates to a special railway measurement mark. The system consists of a laser scanner (1), a digital imaging device (2), a GPS receiver (3), an IMU (4), an industrial computer (5) and a power supply unit (6), and the system can obtain three-dimensional point clouds of rail, roadbed and peripheral environment of the high speed railway and digital images oriented by the earth. The method comprises a method for carrying out movable precise measurement movable precise measurement of the high speed railway and a method for improving the measurement precision by carrying out the simultaneous adjustment with a control point of a rail control network (such as a CPIII foundation pile control network). The system has high integration degree and has the characteristics of high efficiency and high precision, and the precision of the data can reach millimeter level.
Owner:扬州德可达科技有限公司
Method and device for loop discovery, space reuse and protection conversion in MAC bridge connecting network
The topology discovering message transmitted periodically by Loop control net bridge returns to control net bridge the whole loop, and records the state of net bridge and link. The control bridge notifies the topology message to other net bridge through topology instruction, and appoints protective net bridge and protective port to prevent net bridge from blocking protective port, and avoids data to cycle in loop. The net bridge selects shortest path, and implements spatial reuse according to the topology message. Meanwhile the net bridge use heart rate message to examine connectivity of link. When the failure of link is found, it notifies protective net bridge to accomplish fast protection switching.
Owner:周旭扬
Network gatekeeper prioritizing method and system
InactiveUS6907462B1Reduce likelihoodData switching by path configurationMultiple digital computer combinationsControl networkReal-time computing
Methods and systems for controlling network gatekeeper message processing include overload control routines executed by a network gatekeeper to prevent the network gatekeeper from crashing during overload conditions. The overload control routines are executed in a predetermined order so that messages relating to calls in progress are preferentially processed over messages relating to newly originating calls. Fault detection routines detect protocol stack and application level faults of a network gatekeeper.
Owner:RPX CLEARINGHOUSE
Method for acquiring network configuration information and related equipment
The invention provides a method for acquiring network configuration information and related equipment. The method comprises the steps that a strategy control network element sends request informationto a data analysis network element, the request information is used for requesting network configuration information corresponding to each slice network list in at least one slice network list, and each slice network list comprises one or more slice networks; and the strategy control network element receives the network configuration information corresponding to each slice network list sent by thedata analysis network element. In the technical scheme, the policy control network element can send the service quality requirement of the slice network list to be acquired to the data analysis network element. And the data analysis network element can send the corresponding network configuration information to the strategy control network element according to the requirements of the strategy control network element. Therefore, the technical scheme provides a method for effectively acquiring the network configuration information.
Owner:HUAWEI TECH CO LTD
Communication method, device and system
The embodiment of the invention provides a communication method, device and system. According to the scheme, the method comprises the steps the network equipment sends transmission network informationto the strategy control network element, the strategy control network element formulates a control strategy according to the transmission network information and transmits the same to a network device, the network equipment correspondingly adjusts the service mode according to the control strategy, the problem that the efficiency and reliability of data transmission are affected due to the fact that the used service mode is not matched with the current transmission network in the end-to-end data transmission process can be avoided, and the efficiency and reliability of data transmission can be improved.
Owner:HUAWEI TECH CO LTD
Method and device for processing observation data of control points in three-dimensional control network
ActiveCN110793508AImprove accuracyHigh positioning accuracyAngle measurementSurveying instrumentsData packObservation data
The invention relates to a method and device for processing observation data of control points in a three-dimensional control network, and belongs to the technical field of data processing. The methodcomprises the steps of: obtaining the observation data, including azimuth angles, zenith distances and slant distances, of all control points in a three-dimensional control network; according to theobservation data of each control point, calculating coordinates of each control point under a corresponding observation station coordinate system, wherein a corresponding observation station is an observation station of an actual measurement control point; and selecting the observation station coordinate system of one control point as a reference coordinate system, and calculating the coordinatesof each control point under the reference coordinate system according to the rotation relationship between the observation stations of the remaining control points and the normal lines on the observation stations of the selected control points in combination with the coordinates of each control point under the corresponding observation station coordinate system. Compared with the prior art, by considering the influence of plumb line non-parallelism, the observation data of the control points is modified, and an adjustment result after modification is high in accuracy.
Owner:PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU +1
Multitasking microcontroller for controlling the physical layer of a network interface card and method of operation
InactiveUS7127718B1Digital computer detailsMultiprogramming arrangementsMicrocontrollerPhysical layer
There is disclosed an apparatus for controlling a physical layer interface of a network interface card in real time. The apparatus comprises: 1) a first memory for storing a multitasking control program, the multitasking control program comprising a main routine and a plurality of subroutines callable by the main routine; 2) a second memory for storing a plurality of multitasking vectors associated with the multitasking control program; and 3) a microcontroller for executing the multitasking control program, wherein program execution control is transferred from the main routine to a first one of the plurality of subroutines when the first subroutine is called by the main routine and wherein the first subroutine, upon encountering a decision point in the first subroutine that is not yet capable of being decided, updates a first one of the plurality of multitasking vectors associated with the first subroutine with an address of the decision point and transfers program execution control back to the main routine.
Owner:NAT SEMICON CORP
Control network measurement method
The invention provides a control network measurement method, which comprises the steps of: additionally arranging n datum points in an existing control network, wherein the datum points are arranged in a straight line; presetting a datum line for a control network to be measured; measuring offset distances between the n datum points and the datum line on the horizontal plane respectively; placingmeasurement targets at m control points of the control network and n datum points of the datum line; erecting measurement equipment at q preset stations, and utilizing the measurement equipment to measure and obtain a control point observation value and a datum point observation value in a preset observation range of each preset station; and solving coordinates of the m control points by adoptingan adjustment solving algorithm. According to the control network measurement method, the datum line is introduced to restrain the control network, the coordinates of all the control points in the control network are solved by adopting the adjustment solving algorithm, and the control network measurement method has high absolute point location precision.
Owner:CHINA SPALLATION NEUTRON SOURCE SCI CENT
Method for automatically measuring coordinates of target point of fully mechanized coal mining face and measuring robot system
ActiveCN111854712AReasonable designDigital data information retrievalSurveying instrumentsAlgorithmData file
The invention relates to a method for automatically measuring coordinates of a target point of a fully mechanized coal mining face and a measuring robot system. According to the embodiment of the invention, a gyro total station searches a known control point identifier and identifies a point number of the known control point identifier, and queries the point number and a corresponding geodetic coordinate in a control point data file or a database; the geodetic coordinates of the gyroscopic total station are determined according to the geodetic coordinates of the control points, the true northorientation angles of the coordinates from the control points to the gyroscopic total station and the angle distance measurement values of the gyroscopic total station; and according to the searchingazimuth angle and the angle range parameter, a fixed or moving target point identifier is searched in the fully mechanized coal mining face, the point number is identified, the geodetic coordinate ismeasured and calculated, and thus, geodetic coordinate-based relay conduction and positioning of the target point in the fully mechanized coal mining face of the mine are realized. A plurality of gyroscopic total stations can also be installed on the fully mechanized coal mining face to form a geodetic coordinate control network, and full coverage of the geodetic coordinate measurement area of thefixed or moving target point of the fully mechanized coal mining face is achieved.
Owner:BEIZHING LONGRUAN TEKNOLODZHIS INK
Hybrid overlay communication method for data center network
InactiveCN111314196AImprove acceleration performanceGood extensibilityNetworks interconnectionNetwork architectureNetwork communication
The invention particularly relates to a hybrid overlay communication method for a data center network. According to the hybrid overlay communication method for the data center network, a vSwitch hostand EVPN network element equipment based on different implementation modes are managed to an SDN controller through OpenFlow; the SDN controller uses an OVSDB management protocol to issue a configuration and control flow table to the vSwitch host through Rest and RPC modes, and uses a NetConf protocol to control interface configuration and a network strategy on an EVPN network element; the underlay network publishes a management IP of an EVPN network element to a data link by using an OSPF protocol, and connects a vSwich host and the EVPN network element through a routing switch, thereby realizing two-layer interconnection between devices, and realizing fusion of different types of data centers from a control layer and a data layer. According to the hybrid overlay communication method forthe data center network, the fusion of different network architectures on the same platform is solved, the expandability and extensibility of the network are improved, the management cost is reduced,and the network communication quality is greatly improved.
Owner:山东汇贸电子口岸有限公司
Gateway cloud server system
The invention relates to a communication and control gateway server used for connecting wireless sensing devices and providing service based on the wireless sensing devices, in particular to a common gateway server system adopting a cloud structure. An adopted gateway cloud server comprises an interface protocol, a communication module, a data packet analyzing processing module, a service register module and a location-related information pushing module. Through the scheme of the gateway cloud server system, the utilization rate of the communication and control gateway server can be improved, and the gateway cloud server system with computing power and bandwidth is concentrated and shared macroscopically. Through the cloud server system, the efficiency of Internet of things related sensing service can be improved, the resource waste is reduced, and the cost provided for sensing service is greatly reduced.
Owner:周小伟 +1
Industrial control system communication flow online monitoring method based on SARIMA
ActiveCN112187528AAccurate analysisEfficient and accurate defenseData switching networksAnomaly detectionConfidence metric
The invention discloses an industrial control system (ICS) communication flow online monitoring method based on SARIMA. The method comprises the following steps: carrying out small-period SARIMA(p, d,q)x(P, D, Q)s modeling analysis on an industrial control network flow sequence; and generating a flow threshold model based on different confidence coefficients according to the training and prediction step length defined by the small period and the confidence interval. The monitoring host collects communication flow data from the industrial switch in real time, operates a plurality of small-period SARIMA models in a distributed manner, generates a real-time threshold interval, and carries out anomaly detection analysis on the communication flow collected in real time at present. According tothe invention, experimental analysis is carried out by using a target range test board combining industrial control safety virtuality and reality in Zhejiang Province, and detailed algorithm description is provided for test data; and finally, field deployment and application is performed in a certain chemical group in Zhejiang Province to verify the reliability and accuracy of the algorithm.
Owner:ZHEJIANG UNIV
CDN redirection method and system
The invention provides a CDN content distribution network redirection method and system, relates to the technical field of communication, and is used for solving the problem that an edge service nodecannot be flexibly redirected in the prior art. The method comprises the steps that a first edge service node confirms that a base station connected with a target terminal is changed, generates CDN redirection information and sends the CDN redirection information to a scheduling control network element; the scheduling control network element receives the CDN redirection information sent by the first edge service node and determines an available second edge service node; then, the scheduling control network element sends a second service request of a target terminal to a second edge service node, and the second edge service node provides CDN service for the target terminal; and the scheduling control network element sends the access address information of the second edge service node to thetarget terminal. The method and system are applicable to a scenario in which a terminal switches a base station.
Owner:CHINA UNITED NETWORK COMM GRP CO LTD
Method for measuring CPII control network in long and large tunnel with receiving well
The invention discloses a method for measuring a CPII control network in a long and large tunnel with a receiving well, and relates to the field of control network measurement of rail transit. The measurement method mainly comprises the steps of (1) CPII remeasurement and encryption outside a hole: forming a triangular or geodetic quadrilateral connected strip-shaped net by adopting a GNSS staticmeasurement mode and an edge connection type net, and performing unified adjustment; (2) receiving well connection measurement: carrying out in-hole introduction edge measurement by adopting a one-well orientation principle, calculating the coordinates of a reflective sticker fixed by a steel wire on the ground through edge measurement and angle measurement of a ground total station, transmittingthe coordinates of the reflective sticker below the vertical shaft to the coordinates of the reflective sticker below the vertical shaft through the steel wire for orientation again, and then introducing the coordinates into the point position buried in the tunnel (3) CPII measurement in the tunnel: adopting a free observation station method; (4) data processing; and (5) final result checking. Themethod provided by the invention is good in point position stability, high in net type strength and flexible in observation station arrangement; the centering error is reduced, and the angle and distance measurement precision is improved.
Owner:CHINA RAILWAY SIXTH GRP CO LTD +1
Method, device and system for gateway device diagnosis
The invention discloses a method, device and system for gateway device diagnosis. The method includes that a diagnosis project selection page is sent to an operation terminal and displays at least one diagnosis project; a request sent by the operation terminal and used for diagnosing a target diagnosis project is received, and the target diagnosis project is the diagnosis project selected on the diagnosis project selection page; a command for diagnosing the target diagnosis project is sent to a gateway device, and a diagnosis result of the target diagnosis project is obtained; and the diagnosis result of the target diagnosis project is sent to the operation terminal. The method, device and system for the gateway device diagnosis enables a user to control the gateway device at the operation terminal to perform the diagnosis by establishing communication connection between a net management server and the operation terminal, and is rich in selectable diagnosis projects and convenient for the user.
Owner:HUAWEI DEVICE CO LTD
Communication method and related equipment
PendingCN110972200ANetwork traffic/resource managementData switching networksData profilingOperations research
The invention provides a communication method and related equipment, and the method comprises the steps that a strategy control network element transmits first query information to a data analysis network element, and the first query information is used for obtaining the quality information of a service; and the strategy control network element receives first response information sent by the dataanalysis network element, wherein the first response information comprises the quality information of the service requested by the first query information. According to the technical scheme, the policy control network element can be helped to acquire the quality information of the service.
Owner:HUAWEI TECH CO LTD
Policy control method, equipment and system
ActiveCN110149603AMetering/charging/biilling arrangementsAccounting/billing servicesSession managementControl network
The embodiment of the invention discloses a strategy control method, equipment and a system, relates to the technical field of communication, and aims to monitor the use amount of the same use amountmonitoring instance on a plurality of PSAs. The method comprises the steps that a PDU session managed by a session management network element comprises a first PSA and a second PSA, and after the session management network element sends a first URR corresponding to a first monitoring key to the first PSA, the session management network element receives policy control information from a policy control network element; wherein the strategy control information comprises a PCC rule; wherein the PCC rule carries a first monitoring key; and the session management network element is used for indicating to execute the strategy corresponding to the PCC rule on the second PSA, and the session management network element sends the first PDR corresponding to the PCC rule and the second URR corresponding to the first monitoring key to the second PSA.
Owner:HUAWEI TECH CO LTD
Whole vehicle network management method, device and system and computer equipment
ActiveCN111698107AImplement synchronous wake-up operationImplement synchronous sleep operationHigh level techniquesBus networksTelecommunicationsNetwork management
The invention relates to a whole vehicle network management method, device and system and computer equipment, and the method comprises the steps: controlling a gateway of a whole vehicle network to send wake-up information to all network segments of the whole vehicle network when at least one network management node in the whole vehicle network is awakened; when the whole vehicle network meets thesleep condition, enabling the control gateway to send sleep information to each network segment at the same time; when the whole vehicle network does not meet the sleep condition, enabling the control gateway to send sleep prohibition information to each network segment at the same time. According to the scheme, as long as at least one network management node in the whole vehicle network is awakened, the gateway can be controlled to send awakening information to all network segments at the same time; meanwhile, only when the whole vehicle network meets the sleep condition, the gateway can becontrolled to send sleep information to each network segment of the whole vehicle network. Therefore, cross-network-segment synchronous awakening and cross-network-segment synchronous sleep operationof the whole vehicle network are truly achieved, and compared with a traditional OSEK network management mechanism, the OSEK network management mechanism has the advantage of being high in operation reliability.
Owner:SHANGHAI OUFEI INTELLIGNET VEHICLE INTERNET TECH CO LTD
Method, device and system for realizing service continuity
ActiveCN111432440AGuaranteed continuityAccounting/billing servicesNetwork traffic/resource managementQos quality of serviceData pack
The embodiment of the invention provides a method, a device and a system for realizing service continuity, which can ensure the service continuity in the process of transmitting an application layer data packet. The method comprises the following steps: a session management network element receives first survival time information from a policy control network element, wherein the first survival time information indicates the sustainable time of a service when a correct data packet is not received; the session management network element determines the first survival time information as a binding parameter of a quality of service QoS flow; the session management network element sends second survival time information to the access network equipment, wherein the second survival time information is used for indicating the sustainable time; and after receiving the second survival time information from the session management network element, the access network equipment schedules the data packet according to the second survival time information.
Owner:HUAWEI TECH CO LTD
Narrow-space long-span multi-surface special-shaped combined steel truss installation construction method
InactiveCN111379425AReduce usageReduce conflictGeometric CADDesign optimisation/simulationFalseworkField data
The invention relates to the technical field of combined steel truss installation construction, in particular to a narrow-space long-span multi-surface special-shaped combined steel truss installationconstruction method. The method is characterized in that a BIM technology is utilized to optimize arcs and establish a high-level control network, and field data is finely adjusted in combination with a computer; during field construction, steel truss segments are spliced, full hall scaffold operation platforms and supporting frames are erected at building structure ends and steel truss connection parts synchronously, and a main truss is formed through assembling and welding; and then sliding units are formed through connection of secondary trusses among main trusses, and existing concrete linking beams are utilized to arrange sliding tracks, and in-place sliding is performed according to a structure accumulating sliding mode. Through the method, the quantity of scaffolds in use can be greatly reduced, the method is safe and reliable, most overhead work is reduced, construction is convenient, a machine used for lifting is relatively small, and mechanical cost is low. The method is mainly applied to the technical field of combined steel truss installation construction.
Owner:CHINA SHANXI SIJIAN GRP
Construction method for high-precision control measurement of cast-in-situ faced concrete wind tunnel
InactiveCN110646159AImprove the accuracy of useImprove stabilityAerodynamic testingLaser scanningEngineering
The invention discloses a construction method for high-precision control measurement of a cast-in-situ faced concrete wind tunnel. A forced centering device is installed on a control point column; theoverall layout of a control point is established by adopting a most stable triangular network; the stability and reliability of the control point are detected, corresponding guarantee measures are adopted, and a highly stable and reliable measurement control network is formed; in each step of the construction process, more than two construction control measurement methods and a guarantee measureare adopted, including a coordinate method, a suspension method, a light velocity method, a three-dimensional laser scanning method, a BIM modeling method and the like, so that a stable system with aplurality of measurement methods checking each other is formed, and the use precision, stability and reliability of traditional lofting control points and control lines are improved.
Owner:CHINA CONSTR EIGHT ENG DIV CORP LTD
Method for load balancing and network element
ActiveCN110944361AReduce complexityIncrease flexibilityNetwork traffic/resource managementAssess restrictionEngineeringDistributed computing
Owner:HUAWEI TECH CO LTD
Information configuration method and device
The invention discloses an information configuration method and device, which are used for updating configuration information of a private network through a public network. In the method, after an operation mode of terminal equipment is determined according to third private network information of the terminal equipment through an access and mobility management network element, third updated network configuration information is sent to the terminal equipment, and the policy control network element determines fourth policy information according to the third policy information and the operation mode and then sends fourth updated network configuration information to the terminal equipment, so that the terminal equipment accesses a private network according to the updated network configurationinformation and routes traffic of the application according to the updated network configuration information. Through the method, the configuration information of the private network can be flexibly updated through the public network.
Owner:HUAWEI TECH CO LTD
Method and device for data acquisition and processing of multiple industrial-control system platforms
InactiveCN101853025AImprove development efficiencyReduce development difficultySampled-variable control systemsTotal factory controlData acquisitionSoftware development
The invention discloses a method and a device for data acquisition and processing of a multiple industrial-control computer system platforms. The processing method comprises the following steps of: 1. acquiring various data on all industrial-control systems by connecting an data input interface with an industrial-control control network; 2. statically configuring data based on the acquired industrial-control data, and storing the statically configured data in a data storage module; 3. carrying out encoding processing on acquired real-time data in a data processing module according to encoding rules; and 4. transmitting data processed by the data processing module to a third-party application program or system through a data output interface according to the UDP (User Datagram Protocol) protocol. The invention can effectively improve the data acquisition and processing modes of the third-party application program or system for various kinds of industrial-control system software, and solves the problems of difficult data acquisition and processing caused by nonuniform formats of different industrial control computer system data and the like, thereby enhancing software development efficiency, and decreasing software development difficulty.
Owner:BAOSHAN IRON & STEEL CO LTD
Strategy control method, equipment and system
PendingCN112311691ANetwork traffic/resource managementLocation information based serviceService flowSession management
Provided are a policy control method, device and system, which can implement policy control when a service flow of an application server in a DN accessed by a terminal device needs to be processed bya local application server in an LAN in which an intermediate user plane network element is deployed. The method comprises the following steps that: a session management network element receives localarea network LAN data guide information corresponding to a first application from a policy control network element, selects one or more user plane network elements according to the LAN data guide information, and determines a policy rule corresponding to each user plane network element in the one or more user plane network elements respectively; and respectively sending the corresponding strategyrule to each user plane network element. The strategy rule is used for guiding the data of the first application sent by the upstream network element to a local application server of the first application in the target LAN, and sending the data processed by the local application server of the first application in the target LAN to the downstream network element.
Owner:HUAWEI TECH CO LTD
Asymmetrical carrier communication system of electric energy meter
ActiveCN102025399ARealize measurementEasy to controlPower distribution line transmissionCommunications systemElectric power system
The invention relates to an asymmetrical carrier communication system of an electric energy meter, comprising an electric energy meter gateway, a control network bridge and a white information appliance load, wherein the electric energy meter gateway is accessed between a phase line and an N phase in a three-phase four-wire system at the low voltage side of a 10 kV / 0.4 kV distribution transformerof an electrical power system, the control network bridge is accessed between the phase line and N phase of the electrical power system by the electric energy meter gateway, the white information appliance load which is taken as a load is electrically connected with the control network bridge, and the digital communication is carried out between the electric energy meter gateway and the control network bridge and between the electric energy meter gateway and the white information appliance load; and a voltage mode FSK (frequency shift keying) or S-FSK (spread frequency shift keying) modulating signal is adopted for the communication between the electric energy meter gateway and the control network bridge, and a current mode FSK or S-FSK modulating signal is adopted for the communication from the control network bridge to the electric energy meter gateway.
Owner:郭建国 +2
Software-defined data gateway
ActiveCN112118174ASolve the scalability problemCapable of guaranteeing reliabilityResource allocationRelational databasesData synchronizationData acquisition
Owner:NAVAL UNIV OF ENG PLA
Policy transmission method, PCF network element and computer storage medium
The invention provides a policy transmission method, a PCF network element and a computer storage medium. The method comprises the steps that a policy control network element PCF obtains a connection management state of a terminal device, wherein the connection management state comprises a connection state or an idle state; when the connection management state of the terminal device is a connected state, the PCF transmits policy rule information to the terminal device. According to the technical scheme provided by the invention, the signaling overhead can be reduced in the communication process that the PCF issues the policy rule to the terminal device.
Owner:HUAWEI TECH CO LTD
Resource information sending method, device and system
ActiveCN111200845ANetwork traffic/resource managementAssess restrictionResource informationOperations research
The embodiment of the invention relates to the technical field of communication, in particular to a resource information sending method, device and system which are used for avoiding the problem thatresources allocated to at least one of the same DN or network slice of the same terminal conflict with subscription resources of at least one of the DN or network slice. The method comprises the stepsthat a first network element determines remaining resources of a terminal in a first network, wherein the first network is at least one of a first DN and a first network slice, and the residual resources are currently available subscription resources of the terminal in the first network; and the first network element sends information used for indicating the remaining resources to a first policycontrol network element, wherein the first policy control network element is a policy control network element providing service for the terminal in the first network.
Owner:HUAWEI TECH CO LTD
Slicing control method and device
The present invention provides a slice control method and device, the method comprising the steps: a session management network element sends a first request message to a policy control network element, the first request message being used for requesting first session policy control information associated with a first session; and the session management network element receives the first response message from the policy control network element, and performs policy control on the first session according to the first session policy control information in the first response message. A session management network element can carry an identifier of a network slice in a first request message sent to a policy control network element, and an overrun indication used for indicating a terminal device or a first session to access the network slice in an overrun state. Therefore, the policy control network element can formulate the corresponding session policy control information for the first session established in the over-limit state, thereby supporting the terminal equipment to establish the session in the over-limit state of the network slice, and fully utilizing network resources.
Owner:HUAWEI TECH CO LTD
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