A Dynamic Backoff Window Scheme for Machine-Type Communications in Cyber-Physical Systems

IEEE Access

Jenhui Chen¹  Yu-Syuan Lyu¹  Obinna Agbodike²  Ray-Guang Cheng³ 

[1] Department of Computer Science and Information Engineering, College of Engineering, Chang Gung University, Taoyuan, Taiwan;Department of Electrical Engineering, Division of Computer Science and Information Engineering, College of Engineering, Chang Gung University, Taoyuan, Taiwan;Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan;

关键词: Cyber-physical system;    dynamic;    machine-type communication;    random access;    speed-up;   

DOI  :  10.1109/ACCESS.2020.2973239

来源: DOAJ

【 摘 要 】

A cyber-physical system (CPS) requires a time-bounded communication process for real-time interaction between the digital world and the physical world so that they can form a tight loop. Using the machine-type communication (MTC) protocol for a large-scale CPS is a good solution. However, the MTC protocol uses a random access (RA) mechanism to solve the radio resource contention problem, but that inevitably causes access delays especially in scenarios when there is a large number of MTC devices. To meet CPS requirement and address this problem, we propose a dynamic backoff window adjustment (DBA) algorithm for a pull-based RA process that can appropriately distribute the failed MTC devices engaged in the backoff window, so as to expedite their contention retrial time interval and achieve increased success probability. Simulation results showed that the DBA algorithm significantly increases the success probability of MTC devices contending for RA, and as well, shortens the mean access delay of the MTC devices. In comparison to the standard RA backoff scheme and a novel dynamic backoff (DB) scheme, the DBA algorithm proved to be more effective and suitable for the CPS to the best of our knowledge.

【 授权许可】

Unknown