Age of Information in Downlink Systems: Broadcast or Distributed Transmission?

10/26/2022
by   Zhifeng Tang, et al.
0

We analytically decide whether the broadcast transmission scheme or the distributed transmission scheme achieves the optimal age of information (AoI) performance of a multiuser system where a base station (BS) generates and transmits status updates to multiple user equipments (UEs). In the broadcast transmission scheme, the status update for all UEs is jointly encoded into a packet for transmission, while in the distributed transmission scheme, the status update for each UE is encoded individually and transmitted by following the round robin policy. For both transmission schemes, we examine three packet management strategies, namely the non-preemption strategy, the preemption in buffer strategy, and the preemption in serving strategy. We first derive new closed-form expressions for the average AoI achieved by two transmission schemes with three packet management strategies. Based on them, we compare the AoI performance of two transmission schemes in two systems, namely, the remote control system and the dynamic system. Aided by simulation results, we verify our analysis and investigate the impact of system parameters on the average AoI. For example, the distributed transmission scheme is more appropriate for the system with a large number UEs. Otherwise, the broadcast transmission scheme is more appropriate.

READ FULL TEXT

page 5

page 7

research
11/04/2021

The Age of Information of Short-Packet Communications: Joint or Distributed Encoding?

In this paper, we analyze the impact of different encoding schemes on th...
research
10/26/2022

Average Age of Information Penalty of Short-Packet Communications with Packet Management

In this paper, we analyze the non-linear age of information (AoI) perfor...
research
12/21/2018

Age of Information Performance of Multiaccess Strategies with Packet Management

We consider a system consisting of N source nodes communicating with a c...
research
01/16/2019

Relative Age of Information: A New Metric for Status Update Systems

In this paper, we introduce a new data freshness metric, relative Age of...
research
09/01/2020

Precoding and Scheduling for AoI Minimization in MIMO Broadcast Channels

In this paper, we consider a status updating system where updates are ge...
research
12/09/2022

Age of Broadcast and Collection in Spatially Distributed Wireless Networks

We consider a wireless network with a base station broadcasting and coll...
research
02/24/2020

Age of Information Optimized MAC in V2X Sidelink via Piggyback-Based Collaboration

Real-time status update in future vehicular networks is vital to enable ...

Please sign up or login with your details

Forgot password? Click here to reset