For IoTs of smart city scenarios always with the low cost, low power consumption, and high transmission delay properties, the traditional protocols based on feedback messages, e.g., the Automatic Repeat reQuest (ARQ) schemes, would dramatically affect the transmission efficiency. Therefore, the LT codes with only one feedback message in each entire coding process can be used to substitute the traditional protocols. As in many IoTs of smart city scenarios, the data must have both high transmission efficiency and timeliness requirements; thus, the negative effect of only the feedback message in each entire coding process cannot be neglected in such transmission environments. To enhance the transmission efficiency of such ensembles, a novel LT scheme without feedback messages is proposed in this paper. By presenting the definitions of optimal decoding overhead and recovery ratio per symbol, the optimal decoding overhead of LT codes can be found directly, then the encoding overhead of the encoder can be predesigned also. For this reason, the feedback messages in LT schemes can be removed. By using the proposed LT scheme, the transmission efficiency of IoT of smart city scenarios can be enhanced.

中文翻译：

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一种无需反馈消息的新型LT方案，适用于智慧城市场景的物联网

对于始终具有低成本，低功耗和高传输延迟特性的智能城市场景的物联网，基于反馈消息的传统协议（例如，自动重传请求（ARQ）方案）将极大地影响传输效率。因此，在整个编码过程中只有一个反馈消息的LT码可以用来代替传统协议。与智慧城市场景中的许多IoT一样，数据必须具有很高的传输效率和及时性要求。因此，在这样的传输环境中，不能忽略在整个编码过程中仅反馈消息的负面影响。为了提高这种合奏的传输效率，本文提出了一种没有反馈信息的新型LT方案。通过给出最优解码开销和每个符号的恢复率的定义，可以直接找到LT码的最优解码开销，进而可以预先设计编码器的编码开销。因此，可以删除LT方案中的反馈消息。通过使用提出的LT方案，可以提高智慧城市场景中IoT的传输效率。