Age of Information for Updates With Distortion: Constant and Age-Dependent Distortion Constraints
Age of Information for Updates With Distortion: Constant and Age-Dependent Distortion Constraints
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DOI：
10.1109/tnet.2021.3091493
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发表时间：
2021-12-01
影响因子：
3.7
通讯作者：
Ulukus, Sennur
中科院分区：
文献类型：
--
作者：
Bastopcu, Melih;Ulukus, Sennur
我们考虑一个信息更新系统，其中信息接收者向信息提供者请求更新以最小化其信息年龄。更新是在信息提供者（发送者）完成一组任务（如收集数据和对其执行计算）后生成的。我们将此称为更新生成过程。我们将更新的质量建模为在发送端生成更新时所花费的处理时间的递增函数。特别是，我们使用失真作为质量的代理，模型失真作为处理时间的递减函数。在发射机上处理更长时间会得到更好的质量（更低的失真）更新，但它会导致更新在过程中老化。我们根据更新的最低要求质量（最大允许失真）约束，确定接收端更新请求时间和发送端更新处理时间的年龄最优策略。对于所需的质量约束，我们考虑了常数最大允许失真约束以及年龄相关的最大允许失真约束的情况。
We consider an information update system where an information receiver requests updates from an information provider in order to minimize its age of information. The updates are generated at the information provider (transmitter) as a result of completing a set of tasks such as collecting data and performing computations on them. We refer to this as the update generation process. We model the quality of an update as an increasing function of the processing time spent while generating the update at the transmitter. In particular, we use distortion as a proxy for quality, and model distortion as a decreasing function of processing time. Processing longer at the transmitter results in a better quality (lower distortion) update, but it causes the update to age in the process. We determine the age-optimal policies for the update request times at the receiver and the update processing times at the transmitter subject to a minimum required quality (maximum allowed distortion) constraint on the updates. For the required quality constraint, we consider the cases of constant maximum allowed distortion constraints, as well as age-dependent maximum allowed distortion constraints.