• Title, Summary, Keyword: Bluetooth

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Efficient Soft Handover method for Bluetooth (블루투스를 위한 효율적 소프트 핸드오버 방안)

  • Choi, Eun-Seok;Jeong, Myoung-Soon;Oh, Hoon;Park, Hong-Seong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.3A
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    • pp.266-275
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    • 2004
  • Recently, wireless networks require an efficient handover scheme due to increase of mobile devices. But Bluetooth has several problems to support the efficient handover, which are the additional increase of signaling traffic and long time of the initial setup processes of inquiry and paging processes. This paper suggests an efficient Soft Handover method for Bluetooth (eSoHoB), which reduces the eplased time of the inquiry and paging process and supports a soft handover using the anticipation method. This paper implements the eSoHoB using two Bluetooth hardware modules and a testbed to be able to receive streaming data while a Bluetooth terminal is moving. This paper measures handover delays and the operation of the soft handover to verify the proposed mhthod.

Bluetooth based LED Alarm Lamp (블루투스 기반 LED 알람 무드등)

  • Jin, Tae-seok;Baek, Ji-heon;Kim, Cheong-sol;Kim, Ji-Tae;Lee, Hyeon-gyu
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.602-604
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    • 2016
  • In this paper, we propose that it can control the interior lighting, LED and alarm clocks based on Bluetooth. The proposed 'Bluetooth based LED Alarm Lamp'may be an ON / OFF by using a Bluetooth module, by the light sensor and voltage transformers were designed to adjust the ON / OFF and light intensity. Also 7-segment display the clock, it was used a piezo-buzzer that designed to ring an alarm in time. And to decrease the voltage by using the touch sensor can adjust the light brightness. It was also added the ability to align the alarm. This piece (Bluetooth based LED Alarm Lamp) can provide a comfortable environment inside the room of a resident if the environment is dark when voltage is maintained to be ON automatic system. And designed with emphasis being able to improve the quality of sleep due to weak light.

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Bluetooth Audio Gateway and Headset including Connection Function to the Mobile Phone (휴대폰 접속 기능을 포함한 블루투스 오디오 게이트웨이 및 헤드셋)

  • Chung, J.S.;Chung, T.Y.;Jung, K.W.
    • The KIPS Transactions:PartC
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    • v.11C no.4
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    • pp.539-544
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    • 2004
  • This paper presents the implementation of the bluetooth headset and the audio gateway connected to the mobile Phone in the embedded environment. The bluetooth module includes the BC02 processor chip, the BCSP02 firmware and the bluelab software Including bluetooth protocol stack. The above components in the bluetooth module developed at CSR company are used as the development environment. The application program using API functions supported by bluelab is coded by C language and loaded on the flash ROM of the bluetooth module. The cail processing capacity measuring the call setup time and the clearing time between the audio gateway and the headset is considered as the performance parameter of the developed systems. As a call setup and clearing time between the audio gateway and the headset is about 88.8ms, the call processing capacity is about 11 calls per second. Therefore the performance result is satisfied in the aspect of the call processing time.

A Bluetooth Scatternet Reformation Algorithm based on Node Types (노드 형태에 따른 블루투스 스캐터넷 재형성 알고리즘)

  • Lee Han Wook;Kauh S. Ken
    • Journal of KIISE:Information Networking
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    • v.32 no.1
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    • pp.110-122
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    • 2005
  • Bluetooth has been reputed as a wireless networking technology supplying ad-hoc networks between digital devices. In particular, bluetooth scatternet is a most essential part for dynamic ad-hoc networks. But past researches on bluetooth scatternet has hardly treated dynamic scatternet environment. In this paper, we proposed a scatternet reformation algorithm for the case that some nodes escape from the scatternet. The proposed algorithm is a general algorithm which can be applied to many types of bluetooth scatternet regardless of the topology. The proposed algorithm has short reformation time delay because the process has only page process (not including inquiry process ). The algorithm is operated based on Recovery Node Vector which is composed of Recovery Master and Recovery Slave. In this paper, we performed the real hardware experiments for evaluating the performance of the proposed algorithm. In that experiments, we measured the reformation time and reformation probability. In comparison with the case including inquiry process, the proposed algorithm had the improvement in reformation time delay and we obtained high success rate over 97%.

Design of Vehicle Security Authentication System Using Bluetooth 4.0 Technology (블루투스 4.0 기술을 이용한 차량용 보안인증 시스템 설계)

  • Yu, Hwan-Shin
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.7
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    • pp.325-330
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    • 2017
  • Bluetooth 4.0 is a technology suitable for the Internet of things that is used for communication between various devices. This technology is suitable for developing a service by combining with automobiles. In this study, a security authentication system was designed by linking Bluetooth 4.0 technology and a vehicle system as an implementation example of an object internet service. A procedure was designed for security authentication and an authentication method is proposed using a data server. When the security authentication function is provided, various additional services can be developed using the information collection function of the risk notification and user action history. In addition, BLE (Bluetooth Low Energy) technology, which is a wireless communication technology that enables low-power communication and low-power communication in the process of the standardization and development of Bluetooth technology and technology, improves the battery life through the use of RFID or NFC This study expanded the range possible. The security service can be extended by expanding the scope of authentication by the contactless type. Using the proposed system, a customized service can be provided while overcoming the problems of an existing radio frequency (RF)-based system, portability, and battery usage problem.

Implementation of Implantable Bluetooth Bio-telemetry System for Transmitting Acoustic Signals in the Body with Wireless Recharging Function (무선 충전 가능한 블루투스 방식의 체내 음향신호 전송용 이식형 바이오 텔레메트리 시스템 구현)

  • Lee, Sang-June;Kim, Myoung Nam;Lee, Jyung Hyun;Lim, Hyung-Gyu;Cho, Jin-Ho
    • Journal of Korea Multimedia Society
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    • v.18 no.5
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    • pp.652-662
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    • 2015
  • It is necessary to develop small, implantable bio-telemetry systems which can measure and transmit patients' bio-signals from internal body to external receiver. When measuring bio-signals, like electrical bio-signals, acoustic bio-signal measurement has also a big clinical usefulness. But, sound signal has larger frequency bandwidth than any other bio-signals. When considering these issues, a wireless telemetry system which has rapid data transmission rate proportional to wide frequency bandwidth is necessary to be developed. The bluetooth module is used to overcome the data rate limitation caused by the large frequency bandwidth. In this paper, a novel multimedia bluetooth biotelemetry system was developed which consists of transmitter module located in the body and receiver device located outside of the body. The transmitter consists of microphone, bluetooth, and wireless charging device. And the receiver consists of bluetooth and codec system. The sound inside the skin is captured by microphone and sent to receiver by bluetooth while charging. The wireless charging system constantly supplies the electric power to the system. To verify the performance of the developed system, an in vitro experiment has been performed. The results show that the proposed biotelemetry system has ability to acquire the sound signals under the skin.

Simultaneous monitoring of motion ECG of two subjects using Bluetooth Piconet and baseline drift

  • Dave, Tejal;Pandya, Utpal
    • Biomedical Engineering Letters
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    • v.8 no.4
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    • pp.365-371
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    • 2018
  • Uninterrupted monitoring of multiple subjects is required for mass causality events, in hospital environment or for sports by medical technicians or physicians. Movement of subjects under monitoring requires such system to be wireless, sometimes demands multiple transmitters and a receiver as a base station and monitored parameter must not be corrupted by any noise before further diagnosis. A Bluetooth Piconet network is visualized, where each subject carries a Bluetooth transmitter module that acquires vital sign continuously and relays to Bluetooth enabled device where, further signal processing is done. In this paper, a wireless network is realized to capture ECG of two subjects performing different activities like cycling, jogging, staircase climbing at 100 Hz frequency using prototyped Bluetooth module. The paper demonstrates removal of baseline drift using Fast Fourier Transform and Inverse Fast Fourier Transform and removal of high frequency noise using moving average and S-Golay algorithm. Experimental results highlight the efficacy of the proposed work to monitor any vital sign parameters of multiple subjects simultaneously. The importance of removing baseline drift before high frequency noise removal is shown using experimental results. It is possible to use Bluetooth Piconet frame work to capture ECG simultaneously for more than two subjects. For the applications where there will be larger body movement, baseline drift removal is a major concern and hence along with wireless transmission issues, baseline drift removal before high frequency noise removal is necessary for further feature extraction.

The prevent method of data loss due to differences in bit rate between heterogeneous IoT devices (이기종 IoT 장치간의 데이터 전송 속도 차이로 인한 데이터 손실 방지 기법)

  • Seo, Hyungyoon;Park, Jung Kyu
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.23 no.7
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    • pp.829-836
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    • 2019
  • IoT devices are widely used in network construction and are increasing. If necessary, heterogeneous IoT devices are used for data transmission. This paper proposes to prevent the method of data loss due to differences in throughput when the local network is constructed by Bluetooth 5 and long range network does by LoRa(Long Range). Data loss occur when the data transmits through LoRa, due to the throughputs of Bluetooth 5 faster than that of LoRa. The prevent method proposed by this paper can apply not only Bluetooth 5 and LoRa but heterogeneous IoT devices and expect to prevent data loss due to differences in throughput between heterogeneous IoT devices. Also, this paper shows the simulation result by applying the proposed avoid method. In this paper, two way to the preventive method shows the data transmission ratio and amount of memory that of necessity.

The Android-based Bluetooth Device Application Design and Implementation (안드로이드 기반의 블루투스 디바이스 응용 설계 및 구현)

  • Cho, Hyo-Sung;Lee, Hyuk-Joon
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.11 no.1
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    • pp.72-85
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    • 2012
  • Today, although most bluetooth hands-free devices within a vehicle provide telephone service functions such as voice communication, caller id display and SMS message display and so on, they do not provide a function that displays Internet-based text data. We need to develop a scheme that displays the internet-based text data including existing hands-free function because the request for using the Internet service is increasing within a vehicle recently. The proposed bluetooth device application includes advanced function such as SNS message arrival notification, the message display function and we chose Android as the implementation mobile platform giving consideration to the fact that most SNS applications operate on Android and the platform is easily embedded into small embedded device. Smartphone or tablet PC connected with the proposed bluetooth device is an Android-based device and we designed a form of Android app for the function implementation of the devices. When the audio-text gateway app receives SNS text data, it extracts title and sender information from the message header information in a form of text data and sends them via ACL (Asynchronous Connection-Oriented) link to the bluetooth device showing the data on the screen. Android-based bluetooth devices are not possible to play voice through speaker because the bluetooth hands-free or headset profile ported within Android platform normally only includes audio gateway's function. The proposed bluetooth device application, therefore, applies the streaming scheme that sends data via ACL link instead of the way that sending them via SCO (Synchronous Connection-Oriented) link.