In this paper, we study the timely transmission of status updates from multiple sources to an interested receiver. The sources generate updates independently at Poisson rate, which are then coded and transmitted through a shared block fading channel. Age of information (AoI) is an effective indicator to describe the timeliness of transmission by depicting the freshness of information the receiver knows about the interested source. An intuitively age-oriented transmission scheme is sequentially independent transmission, i.e., the transmitter submits the updates one-by-one without waiting. However, this scheme does not always minimize the age. Aiming to improve the age performance of the considered system, we propose a waiting-and-batching transmission scheme. Specifically, earlier generated updates are waiting for late ones and then batching into a long packet before being coded and transmitted. We derive the close-formed expression of the average AoI of the proposed scheme, and conduct extensive numerical comparisons with the independent transmission scheme. Results reveal that our waiting-and-batching scheme can be more beneficial to AoI if: (1) the update generation rate is high; (2) the propagation delay is non-trivial.
Age-oriented Transmission for Multi-source Status Updates: a Waiting-and-Batching Scheme
2020-11-01
1071737 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
J2716 SENT - Single Edge Nibble Transmission, updates and status
Kraftfahrwesen | 2011
|J2716 SENT - Single Edge Nibble Transmission, Updates and Status
SAE Technical Papers | 2011
|Online Contents | 2008