9 results about "Metropolitan area" patented technology

The invention provides an urban circle traffic demand prediction method based on a super network. The method comprises the following steps: constructing a multi-level, multi-attribute and three-dimensional interconnected super network covering highways, subways and railways in an urban circle; constructing a multimode generalized cost function based on the super network; dividing a comprehensive traffic zone, generating a passenger transport demand starting point and terminal point OD matrix, and constructing a travel mode division model considering multimode generalized cost and environmental influence; and based on the travel mode division model, traffic flow distribution is carried out by using a user balanced traffic flow distribution algorithm based on a quasi-Newton method, and a traffic flow prediction result of the urban circle is obtained. According to the method, a solution is provided for efficiently constructing a digital base of a traffic transportation industry vertical domain large model, improving the traffic mode division precision and the like, the bottleneck restricting the improvement of urban circle travel efficiency can be deeply analyzed based on the traffic demand prediction result, and policy suggestions are provided for constructing an efficient urban circle traffic transportation system.

The application proposes a metropolitan area or urban agglomeration substantial boundary identification method based on a multi-modal traffic network, which comprises the following steps: obtaining and preprocessing multi-source travel information data; calculating point accessibility based on improved Mahalanobis distance; calculating node accessibility based on abnormal influence factors; calculating node comprehensive accessibility; identifying the substantial boundary of the metropolitan area or urban agglomeration; and verifying the identification result based on the function polycentricity. The method designs a new point accessibility, node accessibility and node comprehensive accessibility calculation system based on emerging big data analysis technology, and proposes a simple, efficient, accurate and easy-to-understand metropolitan area or urban agglomeration substantial boundary identification method, which has a profound theoretical and practical significance for the application of related big data technology in the field of city and traffic planning and engineering.

The application discloses a physical layer perception dynamic resource allocation method and system for an elastic optical network, and solves the technical problems of existing schemes, such as conservative modulation selection, lack of physical layer perception, poor stability of reinforcement learning, low spectrum utilization rate and high service blocking rate. The method receives a dynamic service request, obtains a network state, generates a candidate path, extracts service, spectrum, physical layer and transmission feasibility features to construct a state vector, outputs a path-modulation joint decision through a reinforcement learning model, calculates a spectrum slot according to a modulation format, searches for a spectrum block meeting a constraint, performs QoT transmission quality verification, generates a reward according to a service establishment result, and iteratively updates model parameters through a reward centralization mechanism. The application improves the learning stability and decision accuracy of the model, realizes dynamic and flexible selection of modulation formats, fully excavates the physical layer transmission margin, improves the spectrum utilization rate and reduces the service blocking rate, and can be adapted to multiple scenes such as backbone networks, metropolitan area networks and data center interconnections.

This application relates to a metropolitan area Internet of Things (IoT) system and its security authentication method, apparatus, and storage medium. The system includes a perception layer for sensing the state of target objects and collecting data via sensor terminals, then forwarding the sensed data to an IoT gateway; a network layer for transmitting the received sensed data via a transmission network; a platform layer for parsing and forwarding the sensed data that has passed access security authentication based on a network controller; and an application layer for implementing IoT application services based on the parsed sensed data. The IoT gateway includes an access authentication module for obtaining a session key before the sensor terminal accesses the platform layer through the IoT gateway. The IoT gateway performs access security authentication on the sensor terminal at the physical layer based on the session key. This application improves the communication resource consumption of IoT security authentication methods and enhances system scalability.

This disclosure relates to a method and device for providing Ethernet Virtual Private Network (VPN) services, and a metropolitan area network (MAN). The method includes forwarding Media Access Control (MAC) addresses based on a bridging domain MAC routing table to provide VPN services. This disclosure defines a novel MAC forwarding mechanism that eliminates the need for VLAN replanning and configuration changes to the relevant OLT (Optical Line Terminal).

This invention relates to a method for constructing a multi-scale collaborative sustainable ecological network, comprising the following steps: identifying urban ecological source areas based on land use type MSPA analysis and landscape connectivity tests, and collecting and preprocessing basic data; extracting urban ecological source areas within the metropolitan area as two-scale ecological superposition source areas, and extracting secondary ecological source areas of the metropolitan area through ecological patch importance evaluation; selecting and assigning resistance factors for different scales to construct a hierarchical ecological resistance surface; simulating ecological corridors based on the resistance surface using minimum cost path and circuit theory at the urban and metropolitan scales to construct an urban-metropolitan ecological network system; determining the protection scope of ecological corridors and source areas, and identifying ecological pinch points and ecological barrier points on the ecological corridors for key protection and restoration; and systematically optimizing the green space ecological network at the central urban area scale based on the urban-metropolitan ecological network system to ultimately form a multi-scale collaborative sustainable ecological network system.