A smooth routing algorithm based on traffic oriented path preserved scheme for mobile satellite networks

The increasing quality of service (QoS) requirements for global mobile IP generates the usage of ATM based low Earth orbit (LEO) mobile satellite (SATATM) networks as the backbone network. Such networks can take advantages from both ATM and mobile satellite networks. In this paper, in order to reduce the system P_HBP (probability of handoff blocking) and delay jitter caused by handoff events, an effective routing scheme, named traffic-oriented path preserved (TOPP) scheme, is proposed. According to the TOPP scheme, firstly, real-time channel traffic detection is processed prior to the path selection, which is supposed to alleviate the system traffic congestion situation. Secondly, predictable knowledge of a LEO satellite network is used to preserve some potential path candidates for the coming handoff events, which is supposed to reduce the system P_HBP. Finally, a sliding-width parameter is used to alleviate the fluctuation caused by the changing of path length during the handoffs to gracefully reduce the variance of end-to-end delay and thus to decrease the system delay jitter