A QoS Control Scheme using Dynamic Window Size Control for Wide Area Ubiquitous Wireless Network

作者：Nuno Fusao^*; Sugiyama Takatoshi; Morikura Masahiro

来源：IEEJ Transactions on Electrical and Electronic Engineering, 2014, 9(6): 633-641.

DOI：10.1002/tee.22019

• ubiquitous
• wireless
• quality of service (QoS)
• medium access control (MAC)

This paper describes a quality-of-service (QoS) control scheme for a wide-area ubiquitous wireless network which is designed to accommodate many wireless terminals (WTs), such as sensors and actuators, in a large cell area. The purpose of this paper is to establish a QoS control scheme in a medium access control (MAC) layer that can hold the transmission delay of high-priority class traffic within a predefined value regardless of how much low-priority class traffic there is. Several QoS control schemes for wireless communication use have been proposed. However, in the wide-area ubiquitous wireless network, an access point (AP) accommodates many WTs and the AP traffic volume often drastically changes. Therefore, conventional schemes sometimes cannot control the QoS of high-priority traffic. To solve this problem, we propose a QoS control scheme that calculates a suitable initial back-off window size of random access for each QoS class by using equations derived from a Markov chain behavior model. The proposed scheme adjusts the window size so as to prevent increased transmission delay of high-priority traffic. The scheme's performance is clarified by computer simulation.

• 出版日期2014-11