DDBA: A Method of Dynamic Deprivable Bandwidth Allocation for Space Information Network

With the rapid development of various types of space applications, space information network faces more and more challenges about the quality of service. How to provide end-to-end QoS based on the limited resources of space information network becomes one of the research focuses. In this paper, a method of dynamic deprivable bandwidth allocation (DDBA) is proposed for delay-sensitive specific applications. Applications are classified to three service levels according to the sensitivity of the delay. High level of services can deprive the bandwidth which has been allocated to the low level of services under certain situation. The results of the simulation illustrate that DDBA improves the use efficiency of the limited bandwidth compared to those typical bandwidth allocation algorithms. Furthermore, the DDBA can also reduce the delay of high level DS services and depress the lost rate.