Using Inter-Mesh Links to Reduce End-to-End Delay in Walker Delta Constellations

Satellite Edge Computing With Collaborative Computation Offloading: An Intelligent Deep Deterministic Policy Gradient Approach

“…, S}, respectively. Each satellite with a MEC server establishes ISLs with four surrounding satellites: two intra-plane ISLs are between adjacent satellites on the same orbit, and two interplane ISLs are between adjacent satellites on two adjacent orbits [34]. Similar to the existing researches on satellite edge computing [6], [15], our model is based on a quasi-static scenario, that is, the network topology and associated users of satellites remain fixed during the computing service.…”

Task Offloading with Data-Dependent Constraints in Satellite Edge Computing Networks: A Multi-Objective Approach

“…(a) (b) Furthermore, satellites are continuously connected to the ISLs [46], which comprise the two intra-plane satellites and t As illustrated in Figure 2b, satellite s5 is connected to satel plane ISLs (represented in orange), while inter-plane ISLs (re satellites s4 and s6 to s5. Then, we use the Wait-For Graph (WFG) [50] W = (T , A) in Figure 5 to represent θ, where T contains all task nodes, the dotted arcs represent data-dependent constraints in Figure 3, and the task sequence of edge servers is indicated by colored solid arcs.…”

Topology construction technology of LEO satellite based on multi-objective optimization algorithm

“…Through the model of intersatellite communication and interorbital communication [9] , a complete LEO constellation design based on genetic algorithm is generated. Qi X firstly identifies a group of grids with maximum topology duration and their corresponding satellites [10] , and then establishes links with other satellites in orbit based on these satellites, reducing the average network delay.…”

“…Constraint (2-7) indicates that A, the adjacent matrix of G, is a real symmetric matrix. Constraint(2)(3)(4)(5)(6)(7)(8) and(2)(3)(4)(5)(6)(7)(8)(9)(10) represents the visible pitch angle range and azimuth angle accordingly. Constraint (2-9) denotes the pitch angle range visible to two satellites blocked by the earth.…”

“…Constraint (2-9) denotes the pitch angle range visible to two satellites blocked by the earth. Constraint(2)(3)(4)(5)(6)(7)(8)(9)(10)(11) indicates the maximum number of links that any node can connect, that is, the maximum degree of nodes. Constraint (2-12) denotes the maximum effective distance of laser communication between two adjacent satellites.…”