Xidian University

Min Sheng

Jiandong Li

Yan Shi

Di Zhou

Weigang Bai

Haoran Li

Sijing Ji

Yan Zhu

Junyu Liu

Yu Su

Feng Ding

Lianwei Zhou

Yan Zhang

Qin Liu

Qixuan Cao

Ronghui Hou

Liuying Wang

Xiayu Zhang

Shun Zhang

Zhicong Xie

Ziwen Xie

Ziye Zhang

Chenxi Bao

Pengyu Huang

Qi Hao

Hongmei He

Hongyan Li

Ting Zheng

Yinghong Ma

Songtao Lei

A system and a method for operation, maintenance and resource management of mega-constellations based on computing-network integration are provided. The system includes: K MEO satellites and N LEO satellites, each MEO satellite manages multiple LEO satellites in each time slot of each scheduling cycle. Each LEO satellite is configured to acquire data of a computing task within a preset time period and perform data computation based on resource scheduling information for time slot t transmitted by an MEO satellite in each time slot t of each scheduling cycle within the preset time period. Each MEO satellite is configured to generate the resource scheduling information for time slot t based on its own resource task status in the time slot t, transmit the resource scheduling information for time slot t to each of the multiple LEO satellites under its management during the time slot t, and to perform coordinated data computation on computing tasks of the multiple LEO satellites it manages.

System and method for operation, maintenance, and resource management of mega-constellations based on computing-network integration

A large-scale network node simulation method based on Linux container is provided, which solves problems of low packet transmission efficiency and multi-thread creation in real-time simulation in a large-scale network scenario. The method includes: scheduling all container nodes in a scenario; managing, by a container node, a dynamic thread through an idle thread management queue, and setting a finite state machine and a function pointer for the dynamic thread; registering, by a source container node, an output queue with a next-hop container node, and informing the next-hop container node to allocate a dynamic thread for receiving and processing the output queue. Packet transmission is realized between the container nodes through data units created in a shared memory. The sending thread and the receiving thread dynamically adjust the number of dynamic threads by checking the state of the output queue.

Network node simulation method based on Linux container

An inter-layer link design method of multilayer constellations with enhanced service coverage capacity is provided, the method includes: establishing a multilayer satellite network spinning T time slot, and obtaining a coordinate of each satellite in the multilayer satellite network at each time slot under a geocentric coordinate system; establishing an adjacency matrix of each constellation in the multilayer satellite network; establishing a feasible set of inter-layer links between adjacent layers in the multilayer satellite network for each time slot; establishing a globally non-uniform service model according to geographical population distribution, and dividing an earth surface into multiple logical area; obtaining a weight of inter-layer link in the feasible set of inter-layer links at each time slot; establishing an assignment model of inter-layer link according to the weight of inter-layer link; and optimizing an inter-layer link set in the feasible set of inter-layer links to obtain a target inter-layer link set.

Inter-layer link design method of multilayer constellations with enhanced service coverage capability

A service-level communication and computing collaborative resource allocation device and method for a large-scale satellite network are provided, the device includes: a network information management function module including a service request collection unit configured to collect service requests arriving at each satellite node in the network, and a network resource collection unit configured to collect available resource status information for each satellite node; a service preprocessing function module configured to preprocess service requests; a service feature extraction function module configured to perform feature extraction for preprocessed service requests to generate service demand features; a service order decision submodule configured to determine a service order of service requests; a service strategy decision submodule configured to output a service strategy of the service request. The device and method can effectively ensure that the large-scale satellite network provides high-performance services for service with service demands of communication and computing collaborative resources.

Service-level communication and computing collaborative resource allocation device and method for large-scale satellite networks

Hierarchical network operation and resource control system and method for a mega satellite constellation, belonging to the field of spatial information technology, are provided. The hierarchical network operation and resource control system includes a service layer, a global organization layer, a local coordination layer and a resource layer. The service layer is used as an input to drive operation of whole system. The global organization layer is to realize 'operation, measurement and control' integrated control and decision of whole network. The local coordination layer is to realize local management decision and management slice generation. The resource layer is to provide physical resource and physical device and realize resource virtualization. By deploying local coordination layer controllers on GSO or MEO satellites, the deployment of local coordination layer controllers is not limited by inability of deploying ground stations globally and therefore the control of large-scale LEO satellite constellation can be achieved.

Hierarchical network operation and resource control system and method for mega satellite constellations

A method for enhancing network coverage based on adaptive generation of resource cell. A traditional cell in a network is taken as an initial state of the network. A correlation matrix in a current network state is generated. Whether |ω−ω|/ω>ε is determined. Each access point is divided into a plurality of resource cells. A CU-DU network mapping table is generated. A middlehaul link of each of the plurality of resource cells is constructed according to the CU-DU network mapping table.

Method for enhancing network coverage based on adaptive generation of resource cell

Lightweight inter-satellite handover device and method for a mega LEO satellite network are provided. An attribute extraction sub-module extracts attributes of handover users in a user information storage unit. Based on the attributes of the handover users, a cluster sub-module clusters the handover users into user clusters. A decision set generator sub-module generates target satellite sets of the user clusters, determines each target satellite of the target satellite sets of the user clusters of each LEO satellite whether belongs to LEO satellites in a management domain of a handover decision point of managing the LEO satellite based on management domain information in a LEO satellite information storage unit, and if YES, performing inter-satellite handover by a centralized decision unit, otherwise performing inter-satellite handover by a distributed decision unit. Therefore, lightweight inter-satellite handover is achieved, cost of handover decision is reduced, and resource utilization of LEO satellite is increased.

Lightweight inter-satellite handover device and method for mega low-earth-orbit satellite networks

A scene-based beam generation method for ground-to-air coverage based on convex polygon subdivision is provided and includes: obtaining a collection of base station positions by using a method of universal transverse mercator projection; constructing a three-dimensional (3D) low altitude signal coverage area; performing convex polygon subdivision on the area to be covered; and generating a beam configuration of each base station. The method realizes generation of beam configurations of base stations in the 3D low altitude signal coverage area, overcomes a problem that the existing 17 kind of scene-based beams cannot realize the coverage of 3D area, overcomes a problem of mismatch between network state information and beam configuration caused by dynamic adjustment of beam configurations. The beam configurations generated by the method does not need to obtain the number of users in real time to adjust the beam, and has a good coverage ability.

Scene-based beam generation method for ground-to-air coverage based on convex polygon subdivision

An embodiment of the present invention provides an uplink access method based on an orthogonal frequency-division multiple access mechanism, comprising: determining the number of subchannels available for a current transmission and the number of time slot blocks required for the current access; transmitting uplink access trigger frames on the available subchannels; randomly selecting among the available subchannels and the time slot blocks; and transmitting an uplink access response frame to an access point by the randomly selected available subchannel and time slot block, to perform random access. The embodiment of the present invention can reduce an average time taken by users to access channels, thereby reducing transmission delay of data packet, reducing waste of time and subchannel resources, and improving the throughput of the entire network.

Orthogonal frequency division multiple access based uplink access method

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Shaanxi, China

Min Sheng