A Priority Control Method for Media Access Control Method SP-MAC to Improve Throughput of Bidirectional Flows

Ryoma ANDO  Ryo HAMAMOTO  Hiroyasu OBATA  Chisa TAKANO  Kenji ISHIDA  

IEICE TRANSACTIONS on Information and Systems   Vol.E100-D   No.5   pp.984-993
Publication Date: 2017/05/01
Publicized: 2017/02/08
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2016NTP0009
Type of Manuscript: Special Section PAPER (Special Section on the Architectures, Protocols, and Applications for the Future Internet)
wireless LAN,  media access control,  synchronization phenomena of coupled oscillators,  Kuramoto-model,  priority,  

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In IEEE802.11 Wireless Local Area Networks (WLANs), frame collisions occur drastically when the number of wireless terminals connecting to the same Access Point (AP) increases. It causes the decrease of the total throughput of all terminals. To solve this issue, the authors have proposed a new media access control (MAC) method, Synchronized Phase MAC (SP-MAC), based on the synchronization phenomena of coupled oscillators. We have addressed the network environment in which only uplink flows from the wireless terminal to an AP exist. However, it is necessary to take into consideration of the real network environment in which uplink and downlink flows are generated simultaneously. If many bidirectional data flows exist in the WLAN, the AP receives many frames from both uplink and downlink by collision avoidance of SP-MAC. As a result, the total throughput decreases by buffer overflow in the AP. In this paper, we propose a priority control method based on SP-MAC for avoiding the buffer overflow in the AP under the bidirectional environment. Also, we show that the proposed method has an effect for improving buffer overflow in the AP and total throughput by the simulation.