The Experts below are selected from a list of 825 Experts worldwide ranked by ideXlab platform
Chih-yung Chang - One of the best experts on this subject based on the ideXlab platform.
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PAMP: A Power-Aware Multicast Protocol for Bluetooth Radio Systems Gwo-Jong Yu
2020Co-Authors: Chih-yung Chang, Kuei-ping Shih, Hsu-jui ChangAbstract:Abstract-Bluetooth is a low power, low cost, and short-range wireless technology. A piconet consists of a master and ups to seven slaves. Devices that desire for receiving data from the same source will construct a multicast group, sharing multicast communication services. A piconet may consist of member and non-member devices of a multicast group, causing non-member devices consuming power for overhearing the multicast message. Rr those members that belong to different Piconeb, a multi-hop communication path is required, hence increases the delay time of multicast service and causes more non-member devices to participate the multicast tree. This paper develops a Power-Aware Multicast Protocol VAMP) for constructing an eflicient multicast tree. By collecting members into same piconet, the constructed multicast tree has characteristics of least non-member devices, smallest tree level, and proper role assignments to members. Experiment results show that PAMP provides eflicient multicast service with low power consumption and small deiav.
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MATR: A Mobility-Aware Topology Restructuring Scheme for Bluetooth Body Area Networks
Journal of Internet Technology, 2018Co-Authors: Qiaoyun Zhang, Guilin Chen, Chih-yung Chang, Cheng-chang ChenAbstract:Bluetooth low energy technology has gradually penetrated into people’s daily life. Nowadays, a number of wearable devices which are embedded with tiny sensors and Bluetooth Radio can create a Bluetooth body area networks (BANs). Because of human mobility, the signal strength of Bluetooth links might be decreased with the link distance, increasing the transmission delay and hence dropping the network throughputs. Considering the mobility issue, this paper presents a mobility-aware topology restructuring scheme, called MATR, for Bluetooth body area networks. The proposed MATR mechanism changes the piconet topology for redirecting the traffic flow to the links with better quality. In addition, the proposed mechanism is also extended to restructure the topology of a scatternet, further reducing the transmission delay of link connecting different Piconets. Performance study reveals that the proposed MATR approaches further reduce the transmission delay and the energy consumption for Bluetooth BANs, decrease the network overheads raised by packet retransmissions, and improve the network throughput of Bluetooth Radio area networks.
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Topology constructing and restructuring mechanisms for Bluetooth Radio networks
2016 IEEE International Conference on Consumer Electronics-Taiwan (ICCE-TW), 2016Co-Authors: Qiaoyun Zhang, Guilin Chen, Liang Zhao, Chih-yung ChangAbstract:The Bluetooth wireless communication technology which is widely used for short-range communications. It operates on 2.4GHz ISM band. In addition, Bluetooth and IEEE 802.11(Wi-Fi) devices are possible and likely to occur on the specific channel in the same location. Bluetooth devices adopt frequency hopping scheme to prevent the likelihood of mutual interferences. Although the frequency hopping can reduce some interferences, as the Wi-Fi and Bluetooth devices are coexisted in the neighborhood, the performances of both networks will be degraded likely. Because they operate on the same band and can't communicate with each other. An interference aware approach for improving the throughput of a given piconet is presented in this paper. An interference aware piconet restructuring mechanism, called IAPR, is proposed. The proposed models are based on role switch operation. The analytical results show that the proposed IAPR approach further improves the network performance between the Wi-Fi and Bluetooth devices and improves the throughput of Bluetooth Radio networks.
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An interference-aware and energy-saving connection protocol for Bluetooth Radio networks
2014 IEEE International Conference on Consumer Electronics - Taiwan, 2014Co-Authors: Qiaoyun Zhang, Guilin Chen, Cuijuan Shang, Chih-yung ChangAbstract:Bluetooth and IEEE 802.11 (Wi-Fi) are two of the most popular communication standards which define a physical and a MAC layers for wireless transmissions and operate on 2.4 GHz ISM band. To avoid the rich interference existed in ISM band, Bluetooth adopts a time-slotted frequency-hopping spread-spectrum scheme, preventing from the interference for a long time on specific channel. However, the coexistence of Bluetooth and Wi-Fi in the neighborhood will degrade the performances of both networks because the two wireless technologies cannot negotiate with each other. This paper presents a novel Bluetooth network construction mechanism which takes into account the frequencies occupied by WiFi and thus constructs an efficient Bluetooth network, aiming at minimizing the interference from Wi-Fi transmissions, when they coexist in the same space. Performance study reveals that the proposed connection protocol reduces the interference between Bluetooth and WiFi and thereby saves the energy of Bluetooth Radio networks.
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A location-and-mobility aware routing protocol for Bluetooth Radio networks
2009 Joint Conferences on Pervasive Computing (JCPC), 2009Co-Authors: Sheng-wen Chang, Prasan Kumar Sahoo, Li-ling Hung, Chih-yung ChangAbstract:Bluetooth is a most promising technology designed for the wireless personal area networks for the cable replacement. In this paper, a location aware mobility based routing scheme for the Bluetooth scatternet is proposed that constructs the links dynamically. Our proposed routing protocol requires location information of the nodes and constructs the route between any source and destination and reduces the number of hops. Besides, the network routing problems are analyzed and role switch operations are proposed to mitigate the problems. Moreover, the roles switch and route optimization operations are also proposed to improve route performance. Rigorous simulation works are done to evaluate the performance of our protocol in terms of mobility speed and number of mobile nodes and to compare our results with similar Bluetooth routing protocols. It is observed that our protocol outperforms in terms of energy consumption and transmission packet overheads as compared to similar Bluetooth routing protocols.
H. Darabi - One of the best experts on this subject based on the ideXlab platform.
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A dual mode 802.11b/Bluetooth Radio in 0.35/spl mu/m CMOS
IEEE Journal of Solid-State Circuits, 2020Co-Authors: H. Darabi, J. Chiu, S. Khorram, Zhimin Zhou, Shan Jiang, K. Evans, E. Chien, B. IbrahimAbstract:A fully integrated dual-mode CMOS transceiver tuned to 2.4 GHz consumes 65 mA in receive mode and 78 mA in transmit mode from a 3-V supply. The Radio includes all the receive and transmit building blocks, such as frequency synthesizer, voltage-controlled oscillator (VCO), and power amplifier, and is intended for use in 802.11b and Bluetooth applications. The Bluetooth receiver uses a low-IF architecture for higher level of integration and lower power consumption, while the 802.11b receiver is direct conversion. The receiver achieves a typical sensitivity of -88 dBm at 11 Mb/s for 802.11b, and -83 dBm for Bluetooth mode. The receiver minimum IIP3 is -8 dBm. Both transmitters use a direct-conversion architecture, and deliver a nominal output power of 0 dBm, with a power range of 20 dB in 2-dB steps.
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A dual-mode 802.11b/Bluetooth Radio in 0.35-/spl mu/m CMOS
IEEE Journal of Solid-State Circuits, 2005Co-Authors: H. Darabi, J. Chiu, S. Khorram, Zhimin Zhou, B. Ibrahim, E. Geronaga, L.h. Tran, A. RofougaranAbstract:A fully integrated dual-mode CMOS transceiver tuned to 2.4 GHz consumes 65 mA in receive mode and 78 mA in transmit mode from a 3-V supply. The Radio includes all the receive and transmit building blocks, such as frequency synthesizer, voltage-controlled oscillator (VCO), and power amplifier, and is intended for use in 802.11b and Bluetooth applications. The Bluetooth receiver uses a low-IF architecture for higher level of integration and lower power consumption, while the 802.11b receiver is direct conversion. The receiver achieves a typical sensitivity of -88 dBm at 11 Mb/s for 802.11b, and -83 dBm for Bluetooth mode. The receiver minimum IIP3 is -8 dBm. Both transmitters use a direct-conversion architecture, and deliver a nominal output power of 0 dBm, with a power range of 20 dB in 2-dB steps.
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A dual mode 802.11b/Bluetooth Radio in 0.35/spl mu/m CMOS
2003 IEEE International Solid-State Circuits Conference 2003. Digest of Technical Papers. ISSCC., 2003Co-Authors: H. Darabi, J. Chiu, S. Khorram, Zhimin Zhou, Shan Jiang, K. Evans, E. Chien, B. Ibrahim, E. Geronaga, L. TranAbstract:A dual-mode CMOS 2.4GHz transceiver consumes 65mA in RX and 78mA in TX from a 3V supply. The receiver achieves a typical sensitivity of -88dBm at 11Mb/s for 802.11b, and -83dBm for Bluetooth mode. The receiver minimum IIP3 is -8dBm, and the transmitter delivers a nominal output power of 0dBm, with a power control range of 20dB in 2dB steps.
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a dual mode 802 11b Bluetooth Radio in 0 35 spl mu m cmos
International Solid-State Circuits Conference, 2003Co-Authors: H. Darabi, J. Chiu, S. Khorram, Zhimin Zhou, Shan Jiang, K. Evans, E. Chien, B. Ibrahim, E. Geronaga, L. TranAbstract:A fully integrated dual-mode CMOS transceiver tuned to 2.4 GHz consumes 65 mA in receive mode and 78 mA in transmit mode from a 3-V supply. The Radio includes all the receive and transmit building blocks, such as frequency synthesizer, voltage-controlled oscillator (VCO), and power amplifier, and is intended for use in 802.11b and Bluetooth applications. The Bluetooth receiver uses a low-IF architecture for higher level of integration and lower power consumption, while the 802.11b receiver is direct conversion. The receiver achieves a typical sensitivity of -88 dBm at 11 Mb/s for 802.11b, and -83 dBm for Bluetooth mode. The receiver minimum IIP3 is -8 dBm. Both transmitters use a direct-conversion architecture, and deliver a nominal output power of 0 dBm, with a power range of 20 dB in 2-dB steps.
Chao-tsun Chang - One of the best experts on this subject based on the ideXlab platform.
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tmcp two layer multicast communication protocol for Bluetooth Radio networks
Computer Networks, 2008Co-Authors: Chao-tsun Chang, Chih-yung Chang, Sheng-wen ChangAbstract:Bluetooth is a low power, low cost, and short-range wireless technology developed for Personal Area Networks (PANs). A Bluetooth multicast group is a set of Bluetooth devices that desire for periodically receiving the multicast messages from the same source. For reducing the propagation delay and saving the bandwidth and energy consumptions, a multicast tree which connects all multicast members serves for the delivery of multicast messages. However, a given connected scatternet topology may not be appropriate for constructing an efficient multicast tree and hence causes power consumption and end-to-end delay. This paper develops a two-layer multicast communication protocol (TMCP) using role switching techniques for constructing an efficient multicast tree. The proposed TMCP collects as many as possible the members into the same piconet, reduces the length of multicast paths and assigns each member with a proper role. The constructed multicast tree has several features including as few as possible the non-member devices, the smallest tree level and the minimal propagation delay. Experiment results show that the TMCP offers efficient multicast service with low power consumption and small delay.
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tarp a traffic aware restructuring protocol for Bluetooth Radio networks
Computer Networks, 2007Co-Authors: Chih-yung Chang, Chao-tsun ChangAbstract:Bluetooth is a low-cost and short-range wireless communication technology. The Bluetooth device randomly searches and connects with other devices using the inquiry/inquiry scan and the page/page scan operations, resulting an uncontrolled scatternet topology. The unpredictable scatternet topology usually raises the problem of redundant traffic and causes inefficient communications. A traffic-aware restructuring protocol (TARP) is presented for partially restructuring a piconet or a pair of two neighboring piconets by applying role switch mechanism. The proposed TARP mainly consists of intra-piconet and inter-piconet restructuring protocols. According to the recent routes and their traffic load information, the intra-piconet restructuring protocol adjusts piconet structure by selecting the proper device to play a master role of a piconet and applies takeover operation to rapidly restructure the piconet topology. The inter-piconet restructuring protocol exchanges devices of two neighboring piconets to reduce the route length and thus improve the power and bandwidth consumptions and the end-to-end transmission delay. Performance results reveal that the proposed restructuring protocols reduce path length of recent routes and save power consumption, thus significantly improve the performance for a given connected scatternet.
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bluecube constructing a hypercube parallel computing and communication environment over Bluetooth Radio systems
Journal of Parallel and Distributed Computing, 2006Co-Authors: Chao-tsun Chang, Chih-yung Chang, Jang-ping SheuAbstract:In parallel computing structures, Hypercubes [P. J. Wan, L. W. Liu, Y. Yang, Optimal routing based on the super-topology in Hypercube WDM networks, 1999, pp. 142-149] and [Y. R. Leu, S. Y. Kuo, A fault-tolerant tree communication scheme for hypercube systems, IEEE Trans Comput. 45(6) (1996) 643-650] have many advantages: they support parallel computing, provide disjoint paths, and tolerate faults. If devices with computing capabilities can be linked as a Hypercube by taking advantage of Bluetooth Radio's features, then an efficient communication and high-performance computing environment can be established by applying currently used algorithms. A Bluetooth device randomly searches for and connects with other devices, using time-consuming inquiry/inquiry scan and page/page scan operation and hence, results in an uncontrolled scatternet topology and inefficient communications. The present work proposes a three-stage distributed construction protocol for rapidly organizing a Hypercube computing environment that was constructed from Bluetooth devices. The proposed protocol governs the construction of links, the assigning of roles and the formation of the scatternet in order to efficiently construct a Hypercube structure. The constructed scatternet easily enables Bluetooth devices to establish a routing path, tolerate faults and create disjoint paths, and thus, achieves parallel and distributed computing in a Bluetooth wireless environment. Experimental results reveal that the proposed protocol can set up a scatternet that is appropriate for parallel computing and communications.
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PIMRC - TARP: a traffic-aware restructuring protocol for Bluetooth Radio networks
2005 IEEE 16th International Symposium on Personal Indoor and Mobile Radio Communications, 2005Co-Authors: Chih-yung Chang, Chao-tsun Chang, Sheng-wen Chang, Chih-hsiung TsengAbstract:Bluetooth is a well-known wireless technology designed for wireless personal area networks (WPAN). The Bluetooth device randomly searches and connects with other devices using the inquiry/inquiry scan and the page/page scan operations, resulting an uncontrolled scatternet topology. The unpredictable scatternet topology usually raises the problem of redundant traffic and causes inefficient communications. A traffic-aware restructuring protocol (TARP) is presented for partially restructuring a piconet or neighboring piconets by applying role switch mechanism. According to the recent routes and their traffic pattern, the TARP adjusts piconet structure by selecting the proper master from devices of a piconet and switches proper devices of neighboring piconets to reduce the route length and thus improve the power and bandwidth consumptions and transmission delay. Performance results show that TARP significantly improves network performance by reducing traffic load and power consumptions
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TARP: a traffic-aware restructuring protocol for Bluetooth Radio networks
2005 IEEE 16th International Symposium on Personal Indoor and Mobile Radio Communications, 2005Co-Authors: Chih-yung Chang, Chao-tsun Chang, Sheng-wen Chang, Chih-hsiung TsengAbstract:Bluetooth is a well-known wireless technology designed for wireless personal area networks (WPAN). The Bluetooth device randomly searches and connects with other devices using the inquiry/inquiry scan and the page/page scan operations, resulting an uncontrolled scatternet topology. The unpredictable scatternet topology usually raises the problem of redundant traffic and causes inefficient communications. A traffic-aware restructuring protocol (TARP) is presented for partially restructuring a piconet or neighboring piconets by applying role switch mechanism. According to the recent routes and their traffic pattern, the TARP adjusts piconet structure by selecting the proper master from devices of a piconet and switches proper devices of neighboring piconets to reduce the route length and thus improve the power and bandwidth consumptions and transmission delay. Performance results show that TARP significantly improves network performance by reducing traffic load and power consumptions
A. Rofougaran - One of the best experts on this subject based on the ideXlab platform.
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A dual-mode 802.11b/Bluetooth Radio in 0.35-/spl mu/m CMOS
IEEE Journal of Solid-State Circuits, 2005Co-Authors: H. Darabi, J. Chiu, S. Khorram, Zhimin Zhou, B. Ibrahim, E. Geronaga, L.h. Tran, A. RofougaranAbstract:A fully integrated dual-mode CMOS transceiver tuned to 2.4 GHz consumes 65 mA in receive mode and 78 mA in transmit mode from a 3-V supply. The Radio includes all the receive and transmit building blocks, such as frequency synthesizer, voltage-controlled oscillator (VCO), and power amplifier, and is intended for use in 802.11b and Bluetooth applications. The Bluetooth receiver uses a low-IF architecture for higher level of integration and lower power consumption, while the 802.11b receiver is direct conversion. The receiver achieves a typical sensitivity of -88 dBm at 11 Mb/s for 802.11b, and -83 dBm for Bluetooth mode. The receiver minimum IIP3 is -8 dBm. Both transmitters use a direct-conversion architecture, and deliver a nominal output power of 0 dBm, with a power range of 20 dB in 2-dB steps.
E.c. Arvelo - One of the best experts on this subject based on the ideXlab platform.
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Open-loop power control based on estimations of packet error rate in a Bluetooth Radio
2003 IEEE Wireless Communications and Networking 2003. WCNC 2003., 2003Co-Authors: E.c. ArveloAbstract:An open-loop power control algorithm is proposed for best-effort reduction of self-interference in multi-standard Bluetooth Radios. By exploiting the automatic repeat request scheme built into Bluetooth data packets, the proposed algorithm estimates whether a running packet error rate is above or below a predefined target and adjusts transmit output power accordingly. The optimum algorithm parameters are chosen through a system simulation that weighs statistical and timing metrics equally. The algorithm dynamics are also simulated in a Rayleigh-fading channel model and shown to converge asymmetrically when increasing or decreasing output power in order to sustain the quality of service for a Bluetooth link.
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WCNC - Open-loop power control based on estimations of packet error rate in a Bluetooth Radio
2003 IEEE Wireless Communications and Networking 2003. WCNC 2003., 2003Co-Authors: E.c. ArveloAbstract:An open-loop power control algorithm is proposed for best-effort reduction of self-interference in multi-standard Bluetooth Radios. By exploiting the automatic repeat request scheme built into Bluetooth data packets, the proposed algorithm estimates whether a running packet error rate is above or below a predefined target and adjusts transmit output power accordingly. The optimum algorithm parameters are chosen through a system simulation that weighs statistical and timing metrics equally. The algorithm dynamics are also simulated in a Rayleigh-fading channel model and shown to converge asymmetrically when increasing or decreasing output power in order to sustain the quality of service for a Bluetooth link.
