Service Function Chain Orchestration in 6G Software Defined Satellite-Ground Integrated Networks

The satellite-ground integrated network will play an important role in the future sixth generation (6G) network. Software defined networking (SDN) and network functions virtualization (NFV) technologies can be utilized in the satellite-ground integrated networks to satisfy various requirements and provide agile service provisioning for users. Thus, we investigate the service function chain (SFC) orchestration problem in software defined satellite-ground integrated networks (SDSGIN) to minimize the overall resource costs, where fully consider the time evolution characteristics of dynamic network topology. Specifically, we consider the resource constraints, latency requirements as well as intermittent spatial link conditions to guarantee link reliability. Moreover, we propose a heuristic decoupled SFC orchestration algorithm (HDSFCO) with low complexity. Finally, the effectiveness and superiority of our proposed algorithm are proved through extensive simulations.