76 research outputs found
Age of Information in Multi-hop Networks with Priorities
Age of Information is a new metric used in real-time status update tracking
applications. It measures at the destination the time elapsed since the
generation of the last received packet. In this paper, we consider the
co-existence of critical and noncritical status updates in a two-hop system,
for which the network assigns different scheduling priorities. Specifically,
the high priority is reserved to the packets that traverse the two nodes, as
they experience worse latency performance. We obtain the distribution of the
age and its natural upper bound termed peak age. We provide tight upper and
lower bounds for priority updates and the exact expressions for the
non-critical flow of packets with a general service distribution. The results
give fundamental insights for the design of age-sensitive multi-hop systems.Comment: Submitted for publication to IEEE Globecom Conferenc
Age-of-Information Dependent Random Access for Massive IoT Networks
As the most well-known application of the Internet of Things (IoT), remote
monitoring is now pervasive. In these monitoring applications, information
usually has a higher value when it is fresher. A new metric, termed the age of
information (AoI), has recently been proposed to quantify the information
freshness in various IoT applications. This paper concentrates on the design
and analysis of age-oriented random access for massive IoT networks.
Specifically, we devise a new stationary threshold-based age-dependent random
access (ADRA) protocol, in which each IoT device accesses the channel with a
certain probability only when its instantaneous AoI exceeds a predetermined
threshold. We manage to evaluate the average AoI of the proposed ADRA protocol
mathematically by decoupling the tangled AoI evolution of multiple IoT devices
and modeling the decoupled AoI evolution of each device as a Discrete-Time
Markov Chain. Simulation results validate our theoretical analysis and affirm
the superior age performance of the proposed ADRA protocol over the
state-of-the-art age-oriented random access schemes.Comment: Accepted to appear at INFOCOM 2020 Workshop on Age of Informatio
Formulation, implementation considerations, and first performance evaluation of algorithmic solutions - D4.1
Deliverable D4.1 del projecte Europeu OneFIT (ICT-2009-257385)This deliverable contains a first version of the algorithmic solutions for enabling opportunistic networks. The presented algorithms cover the full range of identified management tasks: suitability, creation, QoS control, reconfiguration and forced terminations. Preliminary evaluations complement the proposed algorithms. Implementation considerations towards the practicality of the considered algorithms are also included.Preprin
Formulations and identification of algorithmic solutions for enabling opportunistic networks - M4.1
Milestone M4.1 del projecte Europeu OneFIT (ICT-2009-257385).This document contains a detailed description of the algorithms to be implemented to manage the opportunistic networks. There are defined according to the functional and system architecture (WP2) to fulfil the technical challenges.
These algorithms will implemented during the WP4.2 and validated during the WP4.3Postprint (published version
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