Simulation Investigation On Bandwidth Capacity Allocation Schemes For Bluetooth Network

Bluetooth is a radio technology for Wireless Personal Area Networking (WPAN) operating in the 2.4GHz ISM frequency band. And Bluetooth can establish ad hoc networks, called piconets. It can support both synchronous traffic such as voice, and asynchronous data communication.Unlike most wireless techniques, Bluetooth uses time division duplex (TDD) to arrange the transmission slots so that it can avoid the collision. In a Bluetooth piconet, a master node coordinates up to seven active slave nodes, which implies up to fourteen different active links. The schedulers of the devices, especially the one in the master node, are in charge of all the transmission disciplines. Therefore, the policy of the scheduler will affect the network performance of the piconet, such as delay and throughput. Currently the Bluetooth scheduler uses a round robin policy to distribute the slots for different links. In this thesis, we propose a Capacity Assignment based on Priority (CAP) scheme whereby the master node may choose the slave node with the highest priority as the first polling one to distribute the slots. This proposed mechanism mainly deals with the Exponential, Expo_IP traffic so as to improve the network performance of the piconet. In addition, we add some traffic models, such as CBR, Exop_IP, to the simulation circumstance so that we can analyse the performance of Bluetooth with different traffic models and further research the influence on the CAP sheme while adopting the different traffic models.This thesis is organized as follows. In chapter 1, the basic ideal of thesis, intent and signification of the study, the structure of this thesis are introduced. Chpater 2 gives an overview of the Bluetoothtechnique, especially the Bluetooth topology, while chapter 3 quantitatively analyses the Bluetooth capacity and gives simple simulations of Piconet and Scatternet. Chapter 4 describes our proposed Capacity Assignment based on Priority (CAP) scheme as well as the new traffic models. Related simulation work is then given in this chapter. Finally, this thesis is concluded and future work is proposed.