I.M.B.Nogales., Ph.D. student; supervis. V.Zalud, Doc.Ing.CSc., (CTU, Prague)

MODELING and EVALUATION of BLUETOOTH PERSONAL AREA NETWORK

 

In recent years, wireless ad hoc networks have been a growing area of research. Bluetooth is a promising new wireless technology, which enables portable devices to form short-range wireless ad hoc networks, based on radio signals. These short range ad-hoc wireless networks, called piconets, operate in the unlicensed 2.45 GHz ISM (Industrial-Scientific-Medical) band and utilizes 74 MHz of the spectrum, where up to eight devices may be used to configure single or overlapping piconets. A frequency-hopping scheme is used to avoid radio interference and add a level of security to Radio Frequency connections by using a different frequency within the available ISM band for each data packet transmission. Bluetooth is a Master driven Time Division Duplex (TDD) system that supports an asynchronous channel for data traffic as well as synchronous channels for voice traffic. In this paper we present a model on Network Simulator (NS2) to study piconet Medium Access Control (MAC) performance. Furthermore, simulations are used to validate the throughput and delay obtained. These results reveal important performance implications about the effect of interpiconet interference on communication within devices.  We will attempt to explain how effective the Bluetooth technology in supporting collaborative ad hoc networking is. The results show that Bluetooth provides good support for real-time applications adding to the total system capacity, and gives a better overall throughput with shorter delays.

           

Figure1 – Bluetooth Piconets                         

 

 

 

Figure 2 Throughput and Number of Piconets

 

Literature

1. Bluetooth Special Interest Group / Specification of the Bluetooth System Core vol.1v1.1 / www.bluetooth.com

2. BlueHoc / IBM Project page / www-124.ibm.com/developerworks/projects/bluehoc/

3. Manthos Kazantzidis, Rohit Kapoor, Mario Gerla, “Bluetooth – An Enabler for Personal Area Networking”, IEEE Network September, October, 2001