A QoS RED Buffer Management Scheme of Intelligent Gateway Gadget based on a Wireless LAN

The recent information technology (IT) researches aim a ubiquitous environment ultimately. We introduce an intelligent gadget network (IGN) that is a research for a personalization service, and propose a buffer management scheme of gateway gadget that uses a wireless local area network (WLAN) to bind an IGN and an external Internet network. An IGN records everyday life information of a person including an environment and a vital information, and the person can use a personalization service by the recorded information. Therefore, IGN gadgets can require a service of high data rate such as a multimedia that sends and receive with an external Internet. At this time, if a gateway gadget can not support that required data rate, it becomes a bottleneck point. When considering a transmission rate and a current established infrastructure, it is useful to implement a gateway gadget using wireless LAN. This paper proposes a buffer management scheme in medium access control (MAC) layer of gateway gadget that adopts a IEEE802.11e WLAN to connect an IGN with an external Internet network. The proposed buffer mechanism is based on the random early discard (RED) algorithm. The proposed method is simulated in the prototype board that is developed for a next generation wireless LAN standard of IEEE802.11n. The simulation results show that the buffer method in a MAC level is useful for quality of service (QoS) because it lowers drop rates and makes the drop rate of wireless communication system uniform.