We consider a wireless communication network with an adaptive scheme to select the number of packets to be admitted and encoded for each transmission, and characterize the information timeliness. For a network of erasure channels and discrete time, we provide closed form expressions for the Average and Peak Age of Information (AoI) as functions of admission control and adaptive coding parameters, the feedback delay, and the maximum feasible end-to-end rate that depends on channel conditions and network topology. These new results guide the system design for robust improvements of the AoI when transmitting time sensitive information in the presence of topology and channel changes. We illustrate the benefits of using adaptive packet coding to improve information timeliness by characterizing the network performance with respect to the AoI along with its relationship to throughput (rate of successfully decoded packets at the destination) and per-packet delay. We show that significant AoI performance gains can be obtained in comparison to the uncoded case, and that these gains are robust to network variations as channel conditions and network topology change.
翻译:我们考虑建立一个无线通信网络,通过适应性办法选择每个传输的接收和编码包的数量,并描述信息及时性。对于一个删除频道和离散时间的网络,我们提供平均和高峰信息时代(AoI)的封闭形式表达方式,作为接收控制和适应性编码参数、反馈延迟和视频道条件和网络地形而定的最大可行的端到端速度的功能。这些新结果指导了系统设计,以便在存在地形和频道变化的情况下传输时间敏感信息时,对AoI进行强有力的改进。我们通过描述AoI的网络性能及其吞吐(目的地成功解码包的速率)和单包装延迟关系,说明使用适应性组合编码来改进信息及时性的好处。我们表明,与未编码案例相比,AoI的绩效收益很大,这些收益对于随着频道条件和网络地形变化而出现的网络变异是强大的。