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arXiv 1812.01005cs.ITcs.NIeess.SPmath.IT
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能量收集两跳网络中的及时更新:离线和在线策略

Timely Updates in Energy Harvesting Two-hop Networks: Offline and Online Policies

Ahmed Arafa, Sennur Ulukus

摘要:

考虑了一种两跳能量收集通信网络,其中测量更新由源通过中间中继传输到目的地。更新应及时发送,以最大限度地减少信息的年龄,定义为自源生成目的地的最新更新以来所经过的时间。源和中继器使用从自然界收集的能量进行通信,这些能量存储在无限大的电池中。两个节点都使用固定的传输速率,因此更新会产生固定的延迟(服务时间)。提出了两个问题:离线问题和在线问题,在离线问题中能量到达信息是先验已知的,在在线问题中这种信息随时间被因果地揭示。在这两个问题中,它表明,它是最佳的传输更新从源的时间,因为中继准备将它们转发到目的地,使源和中继作为一个组合节点。在最优策略中反复出现的主题是,更新应尽可能均匀地分布在时间上,受能源因果关系和服务时间约束。这在离线设置中是完美实现的,并且几乎可以肯定地通过尽力策略在在线设置中实现。

英文摘要:

A two-hop energy harvesting communication network is considered, in which measurement updates are transmitted by a source to a destination through an intermediate relay. Updates are to be sent in a timely fashion that minimizes the age of information, defined as the time elapsed since the most recent update at the destination was generated at the source. The source and the relay communicate using energy harvested from nature, which is stored in infinite-sized batteries. Both nodes use fixed transmission rates, and hence updates incur fixed delays (service times). Two problems are formulated: an offline problem, in which the energy arrival information is known a priori, and an online problem, in which such information is revealed causally over time. In both problems, it is shown that it is optimal to transmit updates from the source just in time as the relay is ready to forward them to the destination, making the source and the relay act as one combined node. A recurring theme in the optimal policy is that updates should be as uniformly spread out over time as possible, subject to energy causality and service time constraints. This is perfectly achieved in the offline setting, and is achieved almost surely in the online setting by a best effort policy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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