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首页> 外文期刊>IEEE Transactions on Aerospace and Electronic Systems >Packet Layer Erasure Coding in Interplanetary Links: The LTP Erasure Coding Link Service Adapter
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Packet Layer Erasure Coding in Interplanetary Links: The LTP Erasure Coding Link Service Adapter

机译：行星际链路中的数据包层擦除编码：LTP擦除编码链接服务适配器

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摘要

Interplanetary networks are affected by long propagation delays, intermittent connectivity, possible packet losses due to residual errors, and other impairments. To cope with these challenges, the delay-/disruption-tolerant networking (DTN) architecture utilizes the Licklider transmission protocol (LTP) as convergence layer on space links. The LTP reliable service (red) relies on Automatic Repeat reQuest, but very long propagation delays make packet layer forward error correcting (PL-FEC) codes very appealing to protect LTP segments from losses. The key advantage of FEC is that LTP retransmissions would be limited to the unlikely case of decoding failures. To this end, a new FEC-based protocol, to be inserted immediately below LTP, the erasure coding link service adapter (ECLSA), is presented here. ECLSA is completely transparent to LTP, relies on two alternative external libraries for coding/decoding, LibecDLR and OpenFEC, both using low density parity check codes and it is fully integrated with the ION DTN software package of NASA-JPL. This paper aims to provide a solid description of ECLSA, including features functional in a real deployment (such as the dynamic selection of codes). Performance is evaluated at the end of the paper, with nearly ideal results. ECLSA is released as free software and is already included in the "contrib" section of ION.
机译：行星网络受长传播延迟，间歇性连接，由于剩余误差和其他损伤可能的分组损耗的影响。为了应对这些挑战，延迟/中断网络（DTN）架构利用Licklider传输协议（LTP）作为空间链路上的收敛层。 LTP可靠的服务（RED）依赖于自动重复请求，但很长的传播延迟使分组层前向纠错（PL-FEC）代码非常有吸引力，以保护LTP段免受损失的损失。 FEC的关键优势在于LTP重传将限于不太可能解码故障的情况。为此，此处提出了一种新的基于FEC的协议，即在LTP下方插入，擦除编码链路服务适配器（ECLSA）。 ECLSA对LTP完全透明，依赖于使用低密度奇偶校验码的两个替代外部库，利用低密度奇偶校验码，并与NASA-JPL的离子DTN软件包完全集成。本文旨在提供ECLSA的实体描述，包括实际部署中功能功能（例如代码的动态选择）。性能在纸张结束时进行评估，具有几乎理想的结果。 ECLSA被释放为自由软件，并且已包含在离子的“Control”部分中。

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