Age of Error Information and Throughput Tradeoff for IoT Status Update Systems with Truncated and Layer-Coded HARQ
Age of Error Information and Throughput Tradeoff for IoT Status Update Systems with Truncated and Layer-Coded HARQ
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具有截断和分层编码 HARQ 的物联网状态更新系统的错误信息时代和吞吐量权衡
DOI：
10.1109/lwc.2023.3241109
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发表时间：
2023-04
影响因子：
6.3
通讯作者：
Xiangdong Jia
中科院分区：
文献类型：
--
作者：
Zhi Chen;Zhenchao Hao;Junyan Wang;Yuhua Zhao;Qianqian Wang;Xiangdong Jia
结合自适应调制编码和截短分层编码混合自动重传请求（T-L-HARQ），设计了一种新的状态更新系统。利用接收端利用导频辅助估计得到的发射端信道状态信息（CSI），信源自适应地选择传输速率。由于延迟，接收端CSI（CSIR）是CSIT的过时版本，并且解码错误是不可避免的。首先，由于在T-L-HARQ中使用回溯解码，经典的信息年龄不足以量化状态更新的新鲜度，我们提出了错误信息年龄（AoEI），其被定义为自最后成功回溯解码的状态更新生成以来所经过的时间。其次，我们描述了两个连续成功的前馈传输的间隔时间持续时间和成功的T-L-HARQ传输周期的回溯解码深度。由此导出了平均AoEI的封闭表达式。仿真结果表明，通过控制回溯解码深度，在吞吐量和AoEI之间进行折衷设计是必要的。
A novel status update system is designed by combining adaptive modulation and coding, and truncated and layer-coded hybrid automatic repeat request (T-L-HARQ). With the channel state information (CSI) at transmitter (CSIT), which is obtained from the receiver by using pilot-assisted estimation, the source adaptively selects its transmission rate. Due to the delay, the CSI at receiver (CSIR) is the outdated version of the CSIT, and the decoding error is inevitable. Firstly, since the backtrack decoding used in the T-L-HARQ, the classical age of information is insufficient to quantify the status update freshness, we propose the age of error information (AoEI), which is defined as the elapsed time since the generation of the lastly successfully backtrack-decoded status update. Secondly, we characterize the interdeparture time duration of two consecutively successfully feedforward transmissions and the backtrack decoding depth of a successful T-L-HARQ transmission cycle. As a result, the closed-form expression of average AoEI is derived. The simulations show that a tradeoff design between throughput and AoEI is essential by controlling backtrack decoding depth.
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