The Experts below are selected from a list of 9714 Experts worldwide ranked by ideXlab platform
Jianming Wei - One of the best experts on this subject based on the ideXlab platform.
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packet in packet concatenation with Concurrent Transmission for data collection in low power wireless sensor networks
International Conference on Parallel and Distributed Systems, 2018Co-Authors: Peilin Zhang, Oliver Theel, Jianming WeiAbstract:Concurrent Transmission, a novel communication paradigm, has been shown to effectively achieve reliable and energy-efficient flooding in low-power wireless networks. With multiple nodes exploiting a receive-and-forward scheme, this technique works effectively in flooding-based networks, i.e., in one-to-many scenarios. However, application-level scheduling has to be introduced for data collection in wireless sensor networks (WSNs). In this paper, we propose Packet-in-Packet (PiP), an energy-efficient paradigm requiring no application-level scheduling for timely data collection in low-power WSNs. PiP builds on Concurrent Transmissions, exploiting constructive interference and the capture effect to achieve high reliability and low latency. Moreover, PiP uses a packet concatenation capability to gather single-hop information in a best-effort manner. As a result, PiP significantly reduces collection time. We further compare PiP with a state-of-the-art protocol by extensive experiments in a 30-node FlockLab testbed. Experimental results show that PiP highly reduces collection time (i.e., rounds) and achieves good performance in terms of high reliability of approximately 98.7% and high energy efficiency in all experimental scenarios of the real-world testbed.
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Concurrent Transmission based packet concatenation in wireless sensor networks
Local Computer Networks, 2018Co-Authors: Peilin Zhang, Oliver Theel, Jianming WeiAbstract:Concurrent Transmission, a novel communication paradigm, has been shown to effectively achieve reliable and energy-efficient flooding in low-power wireless networks. With multiple nodes exploiting a receive-and-forward scheme, this technique works effectively in one-to-many scenarios. However, application-level scheduling has to be introduced for data collection applications. In this paper, we propose Packet-in-Packet (PiP), an energy-efficient paradigm requiring no application-level scheduling for timely data collection in low-power wireless sensor networks. PiP builds on Concurrent Transmissions, exploiting constructive interference and the capture effect to achieve high reliability, low latency, and high energy efficiency. Moreover, PiP uses a packet concatenation capability to gather single-hop information in a best-effort manner. Experimental results show that PiP achieves high reliability in all experimental scenarios of a real-world testbed.
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LCN - Concurrent Transmission-based Packet Concatenation in Wireless Sensor Networks
2018 IEEE 43rd Conference on Local Computer Networks (LCN), 2018Co-Authors: Peilin Zhang, Oliver Theel, Jianming WeiAbstract:Concurrent Transmission, a novel communication paradigm, has been shown to effectively achieve reliable and energy-efficient flooding in low-power wireless networks. With multiple nodes exploiting a receive-and-forward scheme, this technique works effectively in one-to-many scenarios. However, application-level scheduling has to be introduced for data collection applications. In this paper, we propose Packet-in-Packet (PiP), an energy-efficient paradigm requiring no application-level scheduling for timely data collection in low-power wireless sensor networks. PiP builds on Concurrent Transmissions, exploiting constructive interference and the capture effect to achieve high reliability, low latency, and high energy efficiency. Moreover, PiP uses a packet concatenation capability to gather single-hop information in a best-effort manner. Experimental results show that PiP achieves high reliability in all experimental scenarios of a real-world testbed.
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decot a dependable Concurrent Transmission based protocol for wireless sensor networks
IEEE Access, 2018Co-Authors: Peilin Zhang, Jianming Wei, Weisheng Tang, Oliver TheelAbstract:Concurrent Transmission (CT)-based wireless sensor networks, where nodes transmit at the same moment upon receiving successfully, begin to be applied to real-world scenarios. CT-based protocols have been proven experimentally that they can achieve good the end-to-end performance, namely high reliability, low latency, and high energy efficiency. For various communication patterns (one-to-many, many-to-one, and many-to-many), most current CT-based networks require a given and fixed host to realize global synchronization and scheduling. However, in real-world cases, there is a great deal of interference in the 2.4 GHz ISM band. Interference can partition the network unexpectedly due to the centralized scheduling in current CT-based networks. Even worse, current CT-based networks cannot complete the initialization phase if the unexpected partition occurs at an very beginning. To address this problem, we propose a dependable CT-based protocol (DeCoT) for wireless sensor network (WSN) to support information exchange under adverse conditions. In DeCoT, continuous Transmission with a channel hopping mechanism maintains links under interference and an initiated mechanism decentralizes the network. Through our experiments in FlockLab, under interference, DeCoT achieves an average reliability of 87%, and outperforms the state-of-the-art flooding protocol, namely Robust Flooding that won the 1st place in the EWSN 2017 Dependability Competition. Especially when the source nodes are placed sparsely, DeCoT speeds up the information exchange. Above all, DeCoT can complete the initialization and work properly even when the network partitions unexpectedly. DeCoT has been evaluated as the most reliable protocol in the EWSN 2018 Dependability Competition with respect to resistance against interference. Thus, DeCoT can function dependably under interference.
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ICPADS - Packet-in-Packet: Concatenation with Concurrent Transmission for Data Collection in Low-Power Wireless Sensor Networks
2018 IEEE 24th International Conference on Parallel and Distributed Systems (ICPADS), 2018Co-Authors: Peilin Zhang, Oliver Theel, Jianming WeiAbstract:Concurrent Transmission, a novel communication paradigm, has been shown to effectively achieve reliable and energy-efficient flooding in low-power wireless networks. With multiple nodes exploiting a receive-and-forward scheme, this technique works effectively in flooding-based networks, i.e., in one-to-many scenarios. However, application-level scheduling has to be introduced for data collection in wireless sensor networks (WSNs). In this paper, we propose Packet-in-Packet (PiP), an energy-efficient paradigm requiring no application-level scheduling for timely data collection in low-power WSNs. PiP builds on Concurrent Transmissions, exploiting constructive interference and the capture effect to achieve high reliability and low latency. Moreover, PiP uses a packet concatenation capability to gather single-hop information in a best-effort manner. As a result, PiP significantly reduces collection time. We further compare PiP with a state-of-the-art protocol by extensive experiments in a 30-node FlockLab testbed. Experimental results show that PiP highly reduces collection time (i.e., rounds) and achieves good performance in terms of high reliability of approximately 98.7% and high energy efficiency in all experimental scenarios of the real-world testbed.
Hiroyuki Morikawa - One of the best experts on this subject based on the ideXlab platform.
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distributed antenna system using Concurrent Transmission for wireless automation system
Vehicular Technology Conference, 2017Co-Authors: Kulanuch Chutisemachai, Makoto Suzuki, Chunhao Liao, Theerat Sakdejayont, Hiroyuki MorikawaAbstract:This paper proposes to adopt Concurrent trans- mission in a distributed antenna system to achieve the real- time capability and reliability for wireless automation systems. Our scheme is the simplest way to realize spatial diversity by deploying a large number, e.g. several tens, of transmit antennas and allow all of them to participate in simultaneous packet Transmission without any cooperation. We examine the performance, including packet error rate and high- reliability area percentage, in simulation and over-the-air experiments under the IEEE 802.15.4 standard, where the experiments are conducted with up to 32 Concurrent transmitters using Tmote Sky sensor nodes. We found that the presence of a timing offset limits the performance. By lowering the timing offset to be below half of a chip period, the reliable performance can be achieved without sacrificing the real-time capability.
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Multi-Hop LoRa Networks Enabled by Concurrent Transmission
IEEE Access, 2017Co-Authors: Chunhao Liao, Makoto Suzuki, Guibing Zhu, Daiki Kuwabara, Hiroyuki MorikawaAbstract:In this paper, we strive to construct an efficient multi-hop network based on the sub-GHz low-power wide-area technology. Specifically, we investigate the combination of LoRa, a physical-layer standard that can provide several-kilometer outdoor coverage, and Concurrent Transmission (CT), a recently proposed multi-hop protocol that can significantly improve the network efficiency. The main contributions of this paper are threefold. 1) Since the CT enhances the network efficiency by allowing synchronized packet collisions, the performance of the physical-layer receiver under such packet collisions needs to be carefully examined to ensure the network reliability. We first extensively evaluate the LoRa receiver performance under CT to verify that LoRa is compatible to CT. Specifically, we find that, due to the time-domain and frequency-domain energy spreading effect, LoRa is robust to the packet collisions resulting from CT. 2) We further find the receiver performance under CT can be further improved by introducing timing offsets between the relaying packets. In view of this, we propose a timing delay insertion method, the offset-CT method, that adds random timing delay before the packets while preventing the timing offset from diverging over the multi-hop network. 3) We conduct proof-of-concept experiments to demonstrate the feasibility of CT-based LoRa multi-hop network and the performance improvement brought by the proposed offset-CT method.
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beating the beat rssi based packet combining in Concurrent Transmission sensor networks poster abstract
International Conference on Embedded Networked Sensor Systems, 2016Co-Authors: Theerat Sakdejayont, Makoto Suzuki, Chunhao Liao, Hiroyuki MorikawaAbstract:This paper presents an RSSI-based packet combining (PC) scheme to improve the packet reception reliability affected by a beat interference in wireless sensor networks (WSN) using Concurrent Transmission (CT). To overcome the beat problem, our PC scheme exploits multiple receptions to perform simple post-detection selection combining based on RSSI values. An implementation verifies its feasibility in resource-limited sensor nodes with time-sensitive CT. Evaluations using computer simulations and hardware experiments show significant reliability improvement.
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SenSys - Beating the Beat: RSSI-Based Packet Combining in Concurrent Transmission Sensor Networks: Poster Abstract
Proceedings of the 14th ACM Conference on Embedded Network Sensor Systems CD-ROM, 2016Co-Authors: Theerat Sakdejayont, Makoto Suzuki, Chunhao Liao, Hiroyuki MorikawaAbstract:This paper presents an RSSI-based packet combining (PC) scheme to improve the packet reception reliability affected by a beat interference in wireless sensor networks (WSN) using Concurrent Transmission (CT). To overcome the beat problem, our PC scheme exploits multiple receptions to perform simple post-detection selection combining based on RSSI values. An implementation verifies its feasibility in resource-limited sensor nodes with time-sensitive CT. Evaluations using computer simulations and hardware experiments show significant reliability improvement.
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toward robust Concurrent Transmission for sub ghz non dsss communication poster abstract
International Conference on Embedded Networked Sensor Systems, 2016Co-Authors: Chunhao Liao, Makoto Suzuki, Hiroyuki MorikawaAbstract:Many researches have shown that Concurrent Transmission (CT) helps to improve the energy efficiency and latency of 2.4GHz IEEE-802.15.4-based multi-hop networks. However, it has been shown that the success of CT in IEEE 802.15.4 is mainly due to the DSSS. In view of the great potential of long range sub-GHz technologies for future smart meter applications, we assess the feasibility of applying CT to non-DSSS sub-GHz receivers. In this work, we evaluate the FSK-based receiver performance in the critical case - the scenario that Concurrent transmitted signals are received with the same power such so the mutual interference become worst. Our evaluations are based on the 2-FSK mode of TI CC1120 chips. The results show that the basic 2-FSK mode is vulnerable to CT. On the other hand, if the FEC and the interleaver are adopted, the receiver can survive in the heavy interfering region as long as the timing offset is smaller than 1 μs and the CFO is larger than 5 KHz.
Peilin Zhang - One of the best experts on this subject based on the ideXlab platform.
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packet in packet concatenation with Concurrent Transmission for data collection in low power wireless sensor networks
International Conference on Parallel and Distributed Systems, 2018Co-Authors: Peilin Zhang, Oliver Theel, Jianming WeiAbstract:Concurrent Transmission, a novel communication paradigm, has been shown to effectively achieve reliable and energy-efficient flooding in low-power wireless networks. With multiple nodes exploiting a receive-and-forward scheme, this technique works effectively in flooding-based networks, i.e., in one-to-many scenarios. However, application-level scheduling has to be introduced for data collection in wireless sensor networks (WSNs). In this paper, we propose Packet-in-Packet (PiP), an energy-efficient paradigm requiring no application-level scheduling for timely data collection in low-power WSNs. PiP builds on Concurrent Transmissions, exploiting constructive interference and the capture effect to achieve high reliability and low latency. Moreover, PiP uses a packet concatenation capability to gather single-hop information in a best-effort manner. As a result, PiP significantly reduces collection time. We further compare PiP with a state-of-the-art protocol by extensive experiments in a 30-node FlockLab testbed. Experimental results show that PiP highly reduces collection time (i.e., rounds) and achieves good performance in terms of high reliability of approximately 98.7% and high energy efficiency in all experimental scenarios of the real-world testbed.
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Concurrent Transmission based packet concatenation in wireless sensor networks
Local Computer Networks, 2018Co-Authors: Peilin Zhang, Oliver Theel, Jianming WeiAbstract:Concurrent Transmission, a novel communication paradigm, has been shown to effectively achieve reliable and energy-efficient flooding in low-power wireless networks. With multiple nodes exploiting a receive-and-forward scheme, this technique works effectively in one-to-many scenarios. However, application-level scheduling has to be introduced for data collection applications. In this paper, we propose Packet-in-Packet (PiP), an energy-efficient paradigm requiring no application-level scheduling for timely data collection in low-power wireless sensor networks. PiP builds on Concurrent Transmissions, exploiting constructive interference and the capture effect to achieve high reliability, low latency, and high energy efficiency. Moreover, PiP uses a packet concatenation capability to gather single-hop information in a best-effort manner. Experimental results show that PiP achieves high reliability in all experimental scenarios of a real-world testbed.
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LCN - Concurrent Transmission-based Packet Concatenation in Wireless Sensor Networks
2018 IEEE 43rd Conference on Local Computer Networks (LCN), 2018Co-Authors: Peilin Zhang, Oliver Theel, Jianming WeiAbstract:Concurrent Transmission, a novel communication paradigm, has been shown to effectively achieve reliable and energy-efficient flooding in low-power wireless networks. With multiple nodes exploiting a receive-and-forward scheme, this technique works effectively in one-to-many scenarios. However, application-level scheduling has to be introduced for data collection applications. In this paper, we propose Packet-in-Packet (PiP), an energy-efficient paradigm requiring no application-level scheduling for timely data collection in low-power wireless sensor networks. PiP builds on Concurrent Transmissions, exploiting constructive interference and the capture effect to achieve high reliability, low latency, and high energy efficiency. Moreover, PiP uses a packet concatenation capability to gather single-hop information in a best-effort manner. Experimental results show that PiP achieves high reliability in all experimental scenarios of a real-world testbed.
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decot a dependable Concurrent Transmission based protocol for wireless sensor networks
IEEE Access, 2018Co-Authors: Peilin Zhang, Jianming Wei, Weisheng Tang, Oliver TheelAbstract:Concurrent Transmission (CT)-based wireless sensor networks, where nodes transmit at the same moment upon receiving successfully, begin to be applied to real-world scenarios. CT-based protocols have been proven experimentally that they can achieve good the end-to-end performance, namely high reliability, low latency, and high energy efficiency. For various communication patterns (one-to-many, many-to-one, and many-to-many), most current CT-based networks require a given and fixed host to realize global synchronization and scheduling. However, in real-world cases, there is a great deal of interference in the 2.4 GHz ISM band. Interference can partition the network unexpectedly due to the centralized scheduling in current CT-based networks. Even worse, current CT-based networks cannot complete the initialization phase if the unexpected partition occurs at an very beginning. To address this problem, we propose a dependable CT-based protocol (DeCoT) for wireless sensor network (WSN) to support information exchange under adverse conditions. In DeCoT, continuous Transmission with a channel hopping mechanism maintains links under interference and an initiated mechanism decentralizes the network. Through our experiments in FlockLab, under interference, DeCoT achieves an average reliability of 87%, and outperforms the state-of-the-art flooding protocol, namely Robust Flooding that won the 1st place in the EWSN 2017 Dependability Competition. Especially when the source nodes are placed sparsely, DeCoT speeds up the information exchange. Above all, DeCoT can complete the initialization and work properly even when the network partitions unexpectedly. DeCoT has been evaluated as the most reliable protocol in the EWSN 2018 Dependability Competition with respect to resistance against interference. Thus, DeCoT can function dependably under interference.
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ICPADS - Packet-in-Packet: Concatenation with Concurrent Transmission for Data Collection in Low-Power Wireless Sensor Networks
2018 IEEE 24th International Conference on Parallel and Distributed Systems (ICPADS), 2018Co-Authors: Peilin Zhang, Oliver Theel, Jianming WeiAbstract:Concurrent Transmission, a novel communication paradigm, has been shown to effectively achieve reliable and energy-efficient flooding in low-power wireless networks. With multiple nodes exploiting a receive-and-forward scheme, this technique works effectively in flooding-based networks, i.e., in one-to-many scenarios. However, application-level scheduling has to be introduced for data collection in wireless sensor networks (WSNs). In this paper, we propose Packet-in-Packet (PiP), an energy-efficient paradigm requiring no application-level scheduling for timely data collection in low-power WSNs. PiP builds on Concurrent Transmissions, exploiting constructive interference and the capture effect to achieve high reliability and low latency. Moreover, PiP uses a packet concatenation capability to gather single-hop information in a best-effort manner. As a result, PiP significantly reduces collection time. We further compare PiP with a state-of-the-art protocol by extensive experiments in a 30-node FlockLab testbed. Experimental results show that PiP highly reduces collection time (i.e., rounds) and achieves good performance in terms of high reliability of approximately 98.7% and high energy efficiency in all experimental scenarios of the real-world testbed.
Oliver Theel - One of the best experts on this subject based on the ideXlab platform.
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packet in packet concatenation with Concurrent Transmission for data collection in low power wireless sensor networks
International Conference on Parallel and Distributed Systems, 2018Co-Authors: Peilin Zhang, Oliver Theel, Jianming WeiAbstract:Concurrent Transmission, a novel communication paradigm, has been shown to effectively achieve reliable and energy-efficient flooding in low-power wireless networks. With multiple nodes exploiting a receive-and-forward scheme, this technique works effectively in flooding-based networks, i.e., in one-to-many scenarios. However, application-level scheduling has to be introduced for data collection in wireless sensor networks (WSNs). In this paper, we propose Packet-in-Packet (PiP), an energy-efficient paradigm requiring no application-level scheduling for timely data collection in low-power WSNs. PiP builds on Concurrent Transmissions, exploiting constructive interference and the capture effect to achieve high reliability and low latency. Moreover, PiP uses a packet concatenation capability to gather single-hop information in a best-effort manner. As a result, PiP significantly reduces collection time. We further compare PiP with a state-of-the-art protocol by extensive experiments in a 30-node FlockLab testbed. Experimental results show that PiP highly reduces collection time (i.e., rounds) and achieves good performance in terms of high reliability of approximately 98.7% and high energy efficiency in all experimental scenarios of the real-world testbed.
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Concurrent Transmission based packet concatenation in wireless sensor networks
Local Computer Networks, 2018Co-Authors: Peilin Zhang, Oliver Theel, Jianming WeiAbstract:Concurrent Transmission, a novel communication paradigm, has been shown to effectively achieve reliable and energy-efficient flooding in low-power wireless networks. With multiple nodes exploiting a receive-and-forward scheme, this technique works effectively in one-to-many scenarios. However, application-level scheduling has to be introduced for data collection applications. In this paper, we propose Packet-in-Packet (PiP), an energy-efficient paradigm requiring no application-level scheduling for timely data collection in low-power wireless sensor networks. PiP builds on Concurrent Transmissions, exploiting constructive interference and the capture effect to achieve high reliability, low latency, and high energy efficiency. Moreover, PiP uses a packet concatenation capability to gather single-hop information in a best-effort manner. Experimental results show that PiP achieves high reliability in all experimental scenarios of a real-world testbed.
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LCN - Concurrent Transmission-based Packet Concatenation in Wireless Sensor Networks
2018 IEEE 43rd Conference on Local Computer Networks (LCN), 2018Co-Authors: Peilin Zhang, Oliver Theel, Jianming WeiAbstract:Concurrent Transmission, a novel communication paradigm, has been shown to effectively achieve reliable and energy-efficient flooding in low-power wireless networks. With multiple nodes exploiting a receive-and-forward scheme, this technique works effectively in one-to-many scenarios. However, application-level scheduling has to be introduced for data collection applications. In this paper, we propose Packet-in-Packet (PiP), an energy-efficient paradigm requiring no application-level scheduling for timely data collection in low-power wireless sensor networks. PiP builds on Concurrent Transmissions, exploiting constructive interference and the capture effect to achieve high reliability, low latency, and high energy efficiency. Moreover, PiP uses a packet concatenation capability to gather single-hop information in a best-effort manner. Experimental results show that PiP achieves high reliability in all experimental scenarios of a real-world testbed.
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decot a dependable Concurrent Transmission based protocol for wireless sensor networks
IEEE Access, 2018Co-Authors: Peilin Zhang, Jianming Wei, Weisheng Tang, Oliver TheelAbstract:Concurrent Transmission (CT)-based wireless sensor networks, where nodes transmit at the same moment upon receiving successfully, begin to be applied to real-world scenarios. CT-based protocols have been proven experimentally that they can achieve good the end-to-end performance, namely high reliability, low latency, and high energy efficiency. For various communication patterns (one-to-many, many-to-one, and many-to-many), most current CT-based networks require a given and fixed host to realize global synchronization and scheduling. However, in real-world cases, there is a great deal of interference in the 2.4 GHz ISM band. Interference can partition the network unexpectedly due to the centralized scheduling in current CT-based networks. Even worse, current CT-based networks cannot complete the initialization phase if the unexpected partition occurs at an very beginning. To address this problem, we propose a dependable CT-based protocol (DeCoT) for wireless sensor network (WSN) to support information exchange under adverse conditions. In DeCoT, continuous Transmission with a channel hopping mechanism maintains links under interference and an initiated mechanism decentralizes the network. Through our experiments in FlockLab, under interference, DeCoT achieves an average reliability of 87%, and outperforms the state-of-the-art flooding protocol, namely Robust Flooding that won the 1st place in the EWSN 2017 Dependability Competition. Especially when the source nodes are placed sparsely, DeCoT speeds up the information exchange. Above all, DeCoT can complete the initialization and work properly even when the network partitions unexpectedly. DeCoT has been evaluated as the most reliable protocol in the EWSN 2018 Dependability Competition with respect to resistance against interference. Thus, DeCoT can function dependably under interference.
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ICPADS - Packet-in-Packet: Concatenation with Concurrent Transmission for Data Collection in Low-Power Wireless Sensor Networks
2018 IEEE 24th International Conference on Parallel and Distributed Systems (ICPADS), 2018Co-Authors: Peilin Zhang, Oliver Theel, Jianming WeiAbstract:Concurrent Transmission, a novel communication paradigm, has been shown to effectively achieve reliable and energy-efficient flooding in low-power wireless networks. With multiple nodes exploiting a receive-and-forward scheme, this technique works effectively in flooding-based networks, i.e., in one-to-many scenarios. However, application-level scheduling has to be introduced for data collection in wireless sensor networks (WSNs). In this paper, we propose Packet-in-Packet (PiP), an energy-efficient paradigm requiring no application-level scheduling for timely data collection in low-power WSNs. PiP builds on Concurrent Transmissions, exploiting constructive interference and the capture effect to achieve high reliability and low latency. Moreover, PiP uses a packet concatenation capability to gather single-hop information in a best-effort manner. As a result, PiP significantly reduces collection time. We further compare PiP with a state-of-the-art protocol by extensive experiments in a 30-node FlockLab testbed. Experimental results show that PiP highly reduces collection time (i.e., rounds) and achieves good performance in terms of high reliability of approximately 98.7% and high energy efficiency in all experimental scenarios of the real-world testbed.
Makoto Suzuki - One of the best experts on this subject based on the ideXlab platform.
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distributed antenna system using Concurrent Transmission for wireless automation system
Vehicular Technology Conference, 2017Co-Authors: Kulanuch Chutisemachai, Makoto Suzuki, Chunhao Liao, Theerat Sakdejayont, Hiroyuki MorikawaAbstract:This paper proposes to adopt Concurrent trans- mission in a distributed antenna system to achieve the real- time capability and reliability for wireless automation systems. Our scheme is the simplest way to realize spatial diversity by deploying a large number, e.g. several tens, of transmit antennas and allow all of them to participate in simultaneous packet Transmission without any cooperation. We examine the performance, including packet error rate and high- reliability area percentage, in simulation and over-the-air experiments under the IEEE 802.15.4 standard, where the experiments are conducted with up to 32 Concurrent transmitters using Tmote Sky sensor nodes. We found that the presence of a timing offset limits the performance. By lowering the timing offset to be below half of a chip period, the reliable performance can be achieved without sacrificing the real-time capability.
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Multi-Hop LoRa Networks Enabled by Concurrent Transmission
IEEE Access, 2017Co-Authors: Chunhao Liao, Makoto Suzuki, Guibing Zhu, Daiki Kuwabara, Hiroyuki MorikawaAbstract:In this paper, we strive to construct an efficient multi-hop network based on the sub-GHz low-power wide-area technology. Specifically, we investigate the combination of LoRa, a physical-layer standard that can provide several-kilometer outdoor coverage, and Concurrent Transmission (CT), a recently proposed multi-hop protocol that can significantly improve the network efficiency. The main contributions of this paper are threefold. 1) Since the CT enhances the network efficiency by allowing synchronized packet collisions, the performance of the physical-layer receiver under such packet collisions needs to be carefully examined to ensure the network reliability. We first extensively evaluate the LoRa receiver performance under CT to verify that LoRa is compatible to CT. Specifically, we find that, due to the time-domain and frequency-domain energy spreading effect, LoRa is robust to the packet collisions resulting from CT. 2) We further find the receiver performance under CT can be further improved by introducing timing offsets between the relaying packets. In view of this, we propose a timing delay insertion method, the offset-CT method, that adds random timing delay before the packets while preventing the timing offset from diverging over the multi-hop network. 3) We conduct proof-of-concept experiments to demonstrate the feasibility of CT-based LoRa multi-hop network and the performance improvement brought by the proposed offset-CT method.
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beating the beat rssi based packet combining in Concurrent Transmission sensor networks poster abstract
International Conference on Embedded Networked Sensor Systems, 2016Co-Authors: Theerat Sakdejayont, Makoto Suzuki, Chunhao Liao, Hiroyuki MorikawaAbstract:This paper presents an RSSI-based packet combining (PC) scheme to improve the packet reception reliability affected by a beat interference in wireless sensor networks (WSN) using Concurrent Transmission (CT). To overcome the beat problem, our PC scheme exploits multiple receptions to perform simple post-detection selection combining based on RSSI values. An implementation verifies its feasibility in resource-limited sensor nodes with time-sensitive CT. Evaluations using computer simulations and hardware experiments show significant reliability improvement.
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SenSys - Beating the Beat: RSSI-Based Packet Combining in Concurrent Transmission Sensor Networks: Poster Abstract
Proceedings of the 14th ACM Conference on Embedded Network Sensor Systems CD-ROM, 2016Co-Authors: Theerat Sakdejayont, Makoto Suzuki, Chunhao Liao, Hiroyuki MorikawaAbstract:This paper presents an RSSI-based packet combining (PC) scheme to improve the packet reception reliability affected by a beat interference in wireless sensor networks (WSN) using Concurrent Transmission (CT). To overcome the beat problem, our PC scheme exploits multiple receptions to perform simple post-detection selection combining based on RSSI values. An implementation verifies its feasibility in resource-limited sensor nodes with time-sensitive CT. Evaluations using computer simulations and hardware experiments show significant reliability improvement.
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toward robust Concurrent Transmission for sub ghz non dsss communication poster abstract
International Conference on Embedded Networked Sensor Systems, 2016Co-Authors: Chunhao Liao, Makoto Suzuki, Hiroyuki MorikawaAbstract:Many researches have shown that Concurrent Transmission (CT) helps to improve the energy efficiency and latency of 2.4GHz IEEE-802.15.4-based multi-hop networks. However, it has been shown that the success of CT in IEEE 802.15.4 is mainly due to the DSSS. In view of the great potential of long range sub-GHz technologies for future smart meter applications, we assess the feasibility of applying CT to non-DSSS sub-GHz receivers. In this work, we evaluate the FSK-based receiver performance in the critical case - the scenario that Concurrent transmitted signals are received with the same power such so the mutual interference become worst. Our evaluations are based on the 2-FSK mode of TI CC1120 chips. The results show that the basic 2-FSK mode is vulnerable to CT. On the other hand, if the FEC and the interleaver are adopted, the receiver can survive in the heavy interfering region as long as the timing offset is smaller than 1 μs and the CFO is larger than 5 KHz.