Cao, J., Zhu, X., Sun, S., Jiang, Y., Wei, Z., & Lau, V. K. N. (2023). Multiplexing or Diversity: AoI-Oriented Short-Packet Transmission Over Fading Channels. IEEE Transactions on Communications, 71(2), 757–772. https://doi.org/10.1109/tcomm.2022.3231623
Abstract:
Multiplexing or transmission diversity via dual links enables the reduction in age of information (AoI). We address the open issue of selection between the two transmission modes for AoI-oriented short-packet system over fading channels, with a comprehensive analysis. Closed-form expressions for the average AoI and peak AoI (PAoI) are derived based on the discrete-time Markov-chain process. Then, to obtain the explicit region of preference (RoP) and quantitative PAoI gains of multiplexing/diversity over the single-queue case, we derive the signal-to-noise ratio (SNR) threshold for transmission mode selection, which is shown to be a decreasing function of the arrival rate and saturates at high arrival rate. Also, the monotonicity of the PAoI gains by multiplexing and diversity, and their achievable gains, are analyzed in a comprehensive manner. It is shown that diversity is able to achieve a PAoI gain of more than 3 dB over the single-queue case at low SNR, while multiplexing has a larger RoP than diversity and is selected at high SNR and high arrival rate. Furthermore, both throughput and PAoI violation probability are considered alongside the average PAoI for a wide range of tradeoff in system design.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the National Research Foundation (NRF) Singapore - Future-Proof Reliable and Resilient Wireless Communications for Virtual Power Plant (W-VPP).
Grant Reference no. : N.A