(A) traffic adaptive MAC scheduling scheme for bluetooth with efficient slot utilization

Abstract

Bluetooth is an emerging technology for constructing adhoc wireless Personal Area Networks (WPANs). The access to the medium is based on a TDD scheme controlled by the Master. One of the important issues in Bluetooth is the MAC scheduling. The way in which the Master schedules packet transmission to Slaves or polls them determines system performance. In this paper, we propose a new and practical MAC scheduling scheme for Bluetooth with an aim of achieving a high channel utilization (throughput). The proposed scheme is a kind of the Weighted Round Robin. Our scheme adapts the polling frequency to the traffic conditions by utilizing the size of the HOL packet at the Master queue and the size of the latest packet arrived from Slaves. By adopting the ISAR which adapts the packet sizes to the traffic patterns, our scheme can utilize the size of the latest packet arrived from Slaves as a good estimator for the size of the HOL packet at the Slave queue. By considering a scenario where a Bluetooth master is used as wireless access point to the Internet, we show that our scheme improve the system throughput and average queue delay with regard to a naive Round Robin (RR) scheme.