QoS Routing Algorithm Subject to Delay Constraint for Satellite MPLS Networks

Satellite networks can augment terrestrial wireless networks to provide global services to users regardless of their location. However, traffic on inter-satellite links changes with the satellite´s mobility and the communication, especially the QoS guarantee, becomes difficult, since the change may cause violation of QoS requirements of on-going calls. In this paper, by analyzing the characteristics of satellite networks, a novel satellite networks delay constraint optimal path (SDCOP) algorithm, which can obtain a path to satisfy the delay constraint condition as well as the minimization of interruption during the service, is proposed. This algorithm exploits the predictive nature of connectivity changes of time-varying topology to decrease the influence in the QoS routing performance caused by the handover. Besides, it has a low computing complexity to adapt to the restricted computing capability of satellite equipments. Correlative simulation indicates that this novel algorithm is superior to other current algorithms in respect of computing complexity, service blocking and interrupting probability