• Journal of Institute of Control, Robotics and Systems
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• v.10 no.11
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• pp.1052-1057
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• 2004

Bluetooth technology is essentially a method for wireless connectivity of a diverse set of devices ranging from PDAs, mobile phone, notebook computers, to another equipments, The bluetooth system both point-to point connection and point-to multipoint connection. In point-to multipoint connection, the channel is shared among several bluetooth devices. Two or more devices sharing the same channel form a piconet. There one master device and up to seven active slave devices in a piconet. The radio operates in the unlicensed 2.45GHz ISM band. This allows users who travel world-wide to use bluetooth equipments anywhere. Since the link is based on frequency-hop spread spectrum, multiple channels can exist at the same time. The bluetooth standard ha s been suggested that bluetooth equipments can be used in the short-range, maximum 100 meters. It has been defined that the time takes to setup and establish a bluetooth connection among devices is 10 seconds. It is a long time and may be a cause to lose a chance of finding other non-fixed devices. We propose a routing protocols for scatternets which can be used to control a mobile units(MUs) in this network. The proposed routing protocol is composed of two kinds of bluetooth information, access point(AP) and MU.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.553-556
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• 2005

It is analyzed that WAP packet transmission time to improve performance of WAP using SAR algorithm in Bluetooth channel. The order for SAR algorithm to improve the transfer capability, it is fragmented in WTP total messages that are coming down from upper layer and then the packets are sent one at time in baseband. And it is studied that transmission time for WAP over bluetooth according to DM1, DM3 or DM5 packet type using SAR algorithm in Bluetooth piconet environment. This SAR algorithm decreases WAP packet transmission time of L2CAP baseband packets by sending packet which are spanning multiple slots.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.859.1-861
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• 2002

최근 근거리 무선 통신에 대한 연구가 활발히 진행 되면서 근거리 무선 통신의 규격으로 자리잡고 있는 Bluetooth는 많은 연구가 진행되고 있는 한 분야이다. Bluetooth는 기존 근거리 통신이 가지지 못한 여러 가지 장점들을 가지면서 SIG그룹을 중심으로 많은 연구가 진행중에 있으며 많은 응용분야에 적용하기에 충분한 근거리 무선 통신 기술이다. 따라서 본 논문에서는 Bluetooth 여러 가지 기술 응용중 안전한 지불 시스템을 제안한다. 본 논문에서 제안한 지불 시스템은 사용자를 중심으로 사용자가 승차하고 있는 자동차를 하나의 piconet으로 하여 자동차에서 사용자가 무선 mobile 기기를 이용하여 주유소에서 자동차에 주유을 한 뒤 이를 결제하는 시나리오를 바탕으로 안전한 지불 시스템을 제안하였다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.05a
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• pp.364-367
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• 2005

WPAN 시스템 개발의 중요한 목표는 다양한 대역폭의 멀티미디어 서비스를 효율적으로 언제, 어디서나, 누구와도 자연스럽고 현실감 있게 정보를 교환할 수 있도록 제공하는 것이다. 멀티미디어 서비스 품질을 보장하기 위해서는 Ad hoc 네트워크에서 한정된 자원과 물리적인 한계에 의해서 가장 취약한 부분인 무선접속 구간에서의 트래픽 특성에 따른 채널할당이 가장 중요시 고려되어야 한다. 본 논문에서는 WPAN을 응용을 지원하기 위한 대역폭 요구사항에 대해 알아보고, 응용 서비스별 트래픽 종류에 따라 WPAN MAC 계층에서의 채널 시간 할당방안에 대해 살펴본다.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.748-748
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• 2006

• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.169-171
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• 2001

불루투스는 10m 반경 내에서 1mbps 정도의 속도를 제공해 주는 무선 통신 시스템이다. 블루투스는 피코넷(piconet)을 형성하며 Master/Slave라는 비대칭 구조를 가지며 한 피코넷 당 최대 7개의 Active Mode 노드를 가질 수 있다. 그 이상의 노드를 서비스하기 위해서는 Park Mode를 이용하도록 규정되어 있다. 이 논문에서는 블루투스의 Park Mode에 대해 살펴보고 이를 사용한 3가지 시나리오(경마장, 시나리오, fast Food Restaurant 시나리오, 도서관 시나리오)를 상정하고 각 시나리오에 대해 블루투스 시스템이 실제로 얼마만큼의 성능을 제공할 수 있는지를 시뮬레이션 결과를 통해 알아본다.

• Proceedings of the Korea Multimedia Society Conference
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• 2003.05b
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• pp.238-241
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• 2003

최근 단거리 무선통신 중의 하나인 블루투스(bluetooth)의 기술이 첨가된 전자결재시스템 등의 출현으로 블루투스의 보안 문제가 대두되었다. 기존의 블루투스 보안 모델(bluetooth security model)은 하나의 피코넷(piconet)에서만 적용되어지며, 다수의 피코넷으로 구성된 스캐터넷(scatternet)에서는 적용될 수 없다. 본 논문에서는 스캐터넷상에서 서로 다른 보안 정책을 갖고 있는 다수의 어플리케이션을 지원하는 보안 모델을 제안한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.5A
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• pp.417-425
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• 2005

KOINONIA is high-rate Wireless Personal Area Network (WPAN) technology, and is developed for multimedia traffic transmission in personal area. A KOINONIA piconet is a collection of one or more associated slaves under a single master. Efficient scheduling of a master for the traffic of slaves is essential to use channel effectively and to guarantee QoS of multimedia traffic. We propose a new scheduling algorithm to allocate channel time at desired intervals regardless of superframe length, and a Connection Admission Control(CAC) algorithm to regulate the number of traffics in a piconet. Our proposed algorithms have been shown to save channel time and to meet QoS requirements compared to the conventional weighted round-robin algorithm.

• Journal of Advanced Navigation Technology
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• v.11 no.3
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• pp.281-287
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• 2007

The Bluetooth technology represents an attractive approach to enable short distance wireless connectivity. The Bluetooth standard operates at the 2.4 GHz ISM band and offers the advantage of establishing ad hoc networks, called piconet and scatternet. The spread of Bluetooth implementation in consumer products opens up a new short range wireless networking applications. Bluetooth MAC avoids packet collision within a piconet by simple time multiplexing. But lack of synchronization among independent neighboring piconets introduces packet overlapping within a time slot. In this paper, the wireless network throughput of Bluetooth packet transmission system applying the pure-ALOHA and slotted-ALOHA MAC is investigated according to the impact of channel environment. From the obtained results, the throughput of the Bluetooth MAC protocol shown to offer good performance in wireless channel, and the results are useful for the implementation of Bluetooth networks.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.2
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• pp.242-246
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• 2005

RFID(Radio Frequency Identification) which is emerging from a change in digital convergence paradigm and recently rapidly advancing throughout the overall society is the core technology based on Ubiquitous network. In other words, This is a technology to identify the information of the object and recognize the situation by attaching electrical tag to an object and using Reader that can read the information of the object. With the emergence of the technology, it has turned the existing maintenance of the product into the network and intelligence of the product control by using the bar cord to maintain the product and will lead a revolution throughout overall society by affecting the fields of distribution and product maintenance as well as those of medicines, chemicals and food which the electrical tag can be attached to. his paper shows that utilizing the Bluetooth which is a local wireless telecommunication in the standalone imbedded system can implement the piconet configuration among the Readers and the data telecommunication with the main server.