Age of information (AoI) is a recently proposed metric for measuring information freshness. AoI measures the time that elapsed since the last received update was generated. We consider the problem of minimizing average and peak AoI in a wireless networks, consisting of a set of source-destination links, under general interference constraints. When fresh information is always available for transmission, we show that a stationary scheduling policy is peak age optimal. We also prove that this policy achieves average age that is within a factor of two of the optimal average age. In the case where fresh information is not always available, and packet/information generation rate has to be controlled along with scheduling links for transmission, we prove an important separation principle : the optimal scheduling policy can be designed assuming fresh information, and independently, the packet generation rate control can be done by ignoring interference. Peak and average AoI for discrete time G/Ber/1 queue is analyzed for the first time, which may be of independent interest.

中文翻译：

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在一般干扰约束下优化无线网络中的信息新鲜度

信息年龄（AoI）是最近提出的用于衡量信息新鲜度的指标。AoI衡量自生成上一次收到的更新以来经过的时间。我们考虑了在一般干扰约束下，由一组源－目标链路组成的无线网络中的平均AoI和峰值AoI最小化的问题。当总是有新鲜的信息可以传输时，我们表明固定的调度策略是最佳的峰值年龄。我们还证明，该政策可以使平均年龄达到最佳平均年龄的两倍。在并非总是可获得新鲜信息且必须控制包/信息生成速率以及用于传输的调度链路的情况下，我们证明了这一点很重要分离原理 ：最优调度策略可以在假设有新信息的情况下进行设计，并且独立地，可以通过忽略干扰来完成数据包生成速率的控制。首次分析了离散时间G / Ber / 1队列的峰值和平均AoI，这可能是独立引起的。