Multi-Resource Coordinate Scheduling for Earth Observation in Space Information Networks

Abstract

Space information network (SIN) is an innovative networking architecture to achieve near-realtime mass data observation, processing and transmission over the globe. In the SIN environment, it is essential to coordinate multi-dimensional heterogeneous resources (i.e., observation resource, computation resource and transmission resource) to improve network performance. However, the time varying property of both the observation resource and transmission resource is not fully exploited in existing studies. Dynamic resource management according to instantaneous channel conditions has a potential to enhance network performance. To this end, in this paper, we study the multi-resource dynamic management problem, considering stochastic observation and transmission channel conditions in SINs.Specifically, we develop an aggregate optimization framework for observation scheduling, compression ratio selection and transmission scheduling, and formulate a flow optimization problem based on extended time expanded graph (ETEG) to maximize the sum network utility. Then, we equivalently transform the flow optimization problem on ETEG as a queue stability-related stochastic optimization problem. An online algorithm is proposed to solve the problem in a slot-by-slot manner by exploiting the Lyapunov optimization technique. Performance analysis shows that the proposed algorithm achieves close-to-optimal network utility while guaranteeing bounded queue occupancy. Extensive simulation results further validate the efficiency of the proposed algorithm and evaluate the impacts of various network parameters on the algorithm performance.

A Task-Driven Updated Discrete Graph Assisted Minimum Delivery Delay Routing for Remote Sensing Disruption-Tolerant Networks

“…On the contrary, the extended graph model expands the network topology in the time dimension, and multiple replicas of nodes coexist and are connected with additional edges representing the storage process. Similarly, due to the topology evolution can be regarded as a serial of snapshots with fixed time discretization interval τ t , Time Expanded Graph [19], shown as Fig. 1 with network topology defined in Table. 2.…”

“…Equation 16 18is related with task data model, which indicates the data injected into RS-DTNet. Equation (19) imposes restrictions on the flow, from different task transferred on the same edge. Due to the F j and Cap v u is evaluated by bundle, f j u,v is defined as nonnegative integer, as demonstrated in Equation 20.…”

Reconfigurable Modeling Method of Task-Oriented Architecture for Space Information Networks Based on DaaC

“…In recent years, with the rapid development of manufacture level of satellites, launch technology of rockets, and interstellar communication technology, the role of the Space Information Network (SIN) is more important to national defense and people's livelihoods [1][2][3]. There are many countries of the world that are fully aware of the important role of SIN in international competition and national economic development.…”

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