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首页> 外文期刊>International Journal of Satellite Communications and Networking >Receiver memory management method for HARQ in LTE-based satellite communication system
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Receiver memory management method for HARQ in LTE-based satellite communication system

机译：基于LTE的卫星通信系统中用于HARQ的接收机存储器管理方法

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摘要

For the successful deployment of the long term evolution (LTE)-based mobile satellite service, the price of a user terminal is one of the major factors. A user terminal for the LTE-based satellite communication needs to be implemented with a similar hardware size that is used for a terrestrial LTE user terminal. However, for quality of service provision, the satellite user terminal needs a larger size of memories than the terrestrial terminal does. This is very evident by considering that the N-channel stop and wait hybrid automatic repeat request requires proportionally increasing memory size by the propagation delay, resulting in unmanageable amount of memories in the satellite system. To resolve this problem, we propose an efficient memory management method at the user terminal when the size of memory is insufficient. The simulation results in this paper reveal that the proposed method can increase the throughput about 20.7% when a user terminal is operated under very low throughput condition with an insufficient memory size, compared with the case without memory management scheme. In addition, we show that the additional throughput gain can be obtained by the packet scheduling using the information of receiver memory status.
机译：为了成功部署基于长期演进（LTE）的移动卫星服务，用户终端的价格是主要因素之一。用于基于LTE的卫星通信的用户终端需要以与用于地面LTE用户终端的相似的硬件大小来实现。但是，为了提供服务质量，卫星用户终端需要比地面终端更大的存储器大小。考虑到N通道停止和等待混合自动重发请求需要通过传播延迟按比例增加内存大小，从而导致卫星系统中的内存数量难以控制，这非常明显。为了解决这个问题，我们提出了一种在用户终端内存不足时的有效内存管理方法。本文的仿真结果表明，与没有内存管理方案的情况相比，当用户终端在非常低的吞吐量条件下且内存大小不足时，该方法可以将吞吐量提高约20.7％。此外，我们表明可以通过使用接收器内存状态信息进行数据包调度来获得额外的吞吐量增益。

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