ACP：一种用于在物联网中提供最新更新的端到端传输协议
ACP: An End-to-End Transport Protocol for Delivering Fresh Updates in the Internet-of-Things
摘要：
下一代网络必须支持物联网（IoT）中数十亿台连接设备。为了支持物联网应用，源通过互联网感知并将其测量更新发送到监控器（控制站），以进行实时监控和驱动。理想情况下，这些更新将以高速率传递，仅受源支持的感测速率的约束。然而，给定网络约束，这样的速率可能导致在监视器处的更新的递送中的延迟，这使得监视器处的最新更新对于应用而言是不可接受的旧的。我们提出了一种新的传输层协议，即年龄控制协议（ACP），使及时交付这样的更新到显示器，在网络透明的方式。ACP允许源调整其更新速率以适应动态网络条件，从而使监视器处感测到的信息的平均年龄最小化。我们详细的协议和建议的控制算法。我们使用广泛的模拟和真实世界的实验，其中有一个源发送其更新通过互联网上的监视器在另一个大陆上，证明了它的功效。
英文摘要：
The next generation of networks must support billions of connected devices in the Internet-of-Things (IoT). To support IoT applications, sources sense and send their measurement updates over the Internet to a monitor (control station) for real-time monitoring and actuation. Ideally, these updates would be delivered at a high rate, only constrained by the sensing rate supported by the sources. However, given network constraints, such a rate may lead to delays in delivery of updates at the monitor that make the freshest update at the monitor unacceptably old for the application. We propose a novel transport layer protocol, namely the Age Control Protocol (ACP), that enables timely delivery of such updates to monitors, in a network-transparent manner. ACP allows the source to adapt its rate of updates to dynamic network conditions such that the average age of the sensed information at the monitor is minimized. We detail the protocol and the proposed control algorithm. We demonstrate its efficacy using extensive simulations and real-world experiments, which have a source send its updates over the Internet to a monitor on another continent.
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