关键词: 配电网, RaptorQ, 长期演进技术（LTE）, 可靠通信

Abstract: In the distribution power grid, the new terminal accesses to the substation through LTE, and the wireless interference easily leads to increase in the IP packet loss rate for transmitting terminal control commands, and thus destructing the reliability for distribution power grid control. Recovering these loss packets can be realized by using the RaptorQ（RQ） coding. However, the non-linearity of the RQ failure probability model increases the hardness for minimizing the length of RQ redundancy code. To this end, the Adaptive RQ Encoder and Decoder（ARED） is proposed which exploits the heuristic algorithm to minimize the length of the RQ redundant codes via dynamically adjusting the RQ coding parameters according to feedbacks of the loss rate as well as throughput. The experimental result in the NS-3 LTE demonstrates that, when LTE noise figures are in [18.6, 20.5] dB and [25.6, 28.7] dB, the uplink and downlink loss rates in the LTE deployed with ARED are decreased by 64.35% and 89.92% comparing to those in the raw LTE, respectively.

Key words: distribution power grid, RaptorQ, Long Term Evolution（LTE）, reliable communication