Age-Oriented Opportunistic Relaying in Cooperative Status Update Systems with Stochastic Arrivals

Abstract

This paper considers a cooperative status update system with a source aiming to send randomly generated status updates to a designated destination as timely as possible with the help of a relay. We adopt a recently proposed concept, Age of Information (AoI), to characterize the timeliness of the status updates. We propose an age-oriented opportunistic relaying (AoR) protocol to reduce the AoI of the considered system. Specifically, the relay opportunistically replaces the source to retransmit the successfully received status updates that have not been correctly delivered to the destination, but the retransmission of the relay can be preempted by the arrival of a new status update at the source. By carefully analyzing the evolution of AoI, we derive a closed-form expression of the average AoI for the proposed AoR protocol. We further minimize the average AoI by optimizing the generation probability of the status updates at the source. Simulation results validate our theoretical analysis and demonstrate that the average AoI performance of the proposed AoR protocol is superior to that of the non-cooperative system.

7 pages. This work has been submitted to the IEEE for possible publication

References in corpus (2)

• Minimizing the Age of Information of Cognitive Radio-Based IoT Systems Under A Collision Constraint
• Minimizing Age of Information for Real-Time Monitoring in Resource-Constrained Industrial IoT Networks

Cited by in corpus (5)

• Age-of-Information Dependent Random Access for Massive IoT Networks
• Optimizing Information Freshness in Two-Hop Status Update Systems under a Resource Constraint
• Optimizing Information Freshness in Two-Way Relay Networks
• Multiuser Scheduling for Minimizing Age of Information in Uplink MIMO Systems
• Software-Defined Radio Implementation of Age-of-Information-Oriented Random Access