Building a reliable and efficient network layer for large-volume content delivery over satellite is extremely challenging due to space circumstances of unreliable connectivity, long propagation delay and high dynamics. In this paper, we address those challenges in satellite networking and propose an information-centric data retrieval scheme to provide disruption-tolerant, low-delay and highly efficient content delivery. Our design, namely Coding-enabled Adaptive-Pull (CAP) scheme, is rooted in the concept of information-centric networking, transferring named contents rather than maintaining unreliable end-to-end connections in space. CAP retrieves data in one-to-many request-response model and adaptively adjusts the retrieval expectation according to network states. Meanwhile, the data retrieval scheme embeds with fountain-style erasure coding over its named packets for reliable transmission to reduce the needs of packet retransmission and utilizes in-network caching to tolerate possible link disruption. Evaluation results show that our scheme reduces delivery delay in most cases of unreliable links by nearly 82% and 75% compared with IP and NDN, respectively, and by 72% compared to delay-tolerant networking technique in a space-oriented scenario, with outstanding performance in tolerating delays and disruptions.

由于不可靠的连接，长的传播延迟和高动态的空间环境，为通过卫星传输大量内容而构建可靠而有效的网络层是极富挑战性的。在本文中，我们解决了卫星网络中的这些挑战，并提出了一种以信息为中心的数据检索方案，以提供容忍中断，低延迟和高效的内容交付。我们的设计（即启用编码的自适应拉（CAP）方案）扎根于以信息为中心的网络概念，即传输命名内容，而不是在空间中保持不可靠的端到端连接。CAP以一对多请求-响应模型检索数据，并根据网络状态自适应地调整检索期望。同时，数据检索方案在其命名的数据包上嵌入了喷泉式擦除编码，以实现可靠的传输，从而减少了数据包重传的需求，并利用网络内缓存来容忍可能的链路中断。评估结果表明，在面向空间的情况下，我们的方案与IP和NDN相比，在大多数不可靠链路的情况下分别将传输延迟分别降低了近82％和75％，与容错网络技术相比，降低了72％。容忍延迟和中断的性能。