A QoS-based Routing Algorithm in Multimedia Satellite Networks

Real-time multimedia applications impose strict delay bounds and are sensitive to delay variations. Satellite link handover increases delay jitter and signaling overhead as well as the termination probability of ongoing connections. To satisfy the QoS requirements of multimedia applications, satellite routing protocols should consider link handovers and minimize their effect on the active connections. A new routing algorithm is proposed to reduce both the inter-satellite handover and ISL handover. Once a connection request arrives, the remaining coverage time of satellites is used in the deterministic UDL routing. In the probabilistic ISL routing, the propagation delay and existence probability of ISL links are considered to reduce the delay and ISL handover probability. The rerouting algorithm is called when link handover occurs. Experiments show that this routing algorithm results in small delay jitter, low rerouting frequency, and low rerouting processing overhead.