Beam discarding method and system in satellite delay interruption tolerant network

The invention discloses a beam discarding method and system in a satellite delay interruption tolerant network. When the method carries out discarding operation at each time, whether the available storage space (comprising remaining storage space and the total occupancy space of beams lower than the utility value of a new beam) of a new beam is enough to store a new beam is firstly determined; ifnot, the new beam is directly discarded to avoid invalid discarding; and if yes, with a higher utility value and more beams as a principle, a proper beam is selected in the discarded beams and is keptto avoid invalid discarding. The method and the system work in a passive delay interruption tolerant network congestion control algorithm to effectively enhance the average delivery probability of the beam. 本发明公开了种卫星延迟中断容忍网络中丢弃束方法及系统，其中，该方法在每次执行丢弃操作时，首先确定新束可用存储空间(包括剩余存储空间和低于新束效用值的束的总占用空间)是否足以存储新束：如果不足，则直接丢弃新束以避免"无效丢弃"；如果充足，则以更高效用值、更多束为原则，在丢弃的束中选择合适的束进行保留，以避免"无效丢弃"。本发明工作在被动式延迟中断容忍网络拥塞控制算法中可以有效提升束的平均投递概率。