A CENTRALIZED TIME-SLOT LEASING-BASED QOS ROUTING PROTOCOL OVER BLUETOOTH WPANS

In this paper, we investigate a new efficient quality of ser-vice (QoS) routing protocol based on the time-slot leas-ing mechanism over Bluetooth wireless personal area net-works (WPANs). In a Bluetooth scatternet, a QoS route path is constructed through a series of QoS slave-master-slave communications. The ”transmission holding ” prob-lem is incurred because the master node is the communica-tion bottleneck for each slave-master-slave communication. To alleviate this problem, a time-slot leasing scheme is adaptively incorporated into our scheme to provide a com-pletely new QoS routing protocol. This QoS routing pro-tocol can additionally offer extra slave-to-slave QoS com-munication capability to effectively reduce the workload of the master node and significantly promote the success rate of finding a QoS route. In our proposed QoS routing proto-col, QoS slave-master-slave and slave-to-slave communica-tion mechanisms are simultaneously considered in order to achieve a high success rate of QoS routing from the source to destination nodes. Finally, simulation results demon-strate that this time-slot leasing-based QoS routing proto-col can significantly improve the success ratio, delay time, throughput, and bandwidth utilization when compared to other existing QoS routing protocols. KEY WORDS Bluetooth, time-slot leasing (TSL), quality of service (QoS), wireless personal area network (WPAN), wireless communication.