Pub Date : 2015-03-16DOI: 10.1109/ICMU.2015.7061039
Shizuya Irimoto, Yuta Maruoka, Kazunori Ueda
In recent years, Wireless Mesh Networks (WMN) technology has been developed and widely known. WMN has advantages about provisioning cost and stability of networks. However, it is necessary to send and receive a lot of control packets in order to establish routes among access points. We have proposed MBCR to reduce control packets. Furthermore, we propose MBCR-ATLM that adopts the Airtime as metric to ensure compatibility or examine the influence of the difference metric. In this paper, these two MBCR are compared with HWMP, which is standardized as routing method of WMN, from simulation results.
{"title":"Performance evaluation of WMN routing methods considering amount of control packets","authors":"Shizuya Irimoto, Yuta Maruoka, Kazunori Ueda","doi":"10.1109/ICMU.2015.7061039","DOIUrl":"https://doi.org/10.1109/ICMU.2015.7061039","url":null,"abstract":"In recent years, Wireless Mesh Networks (WMN) technology has been developed and widely known. WMN has advantages about provisioning cost and stability of networks. However, it is necessary to send and receive a lot of control packets in order to establish routes among access points. We have proposed MBCR to reduce control packets. Furthermore, we propose MBCR-ATLM that adopts the Airtime as metric to ensure compatibility or examine the influence of the difference metric. In this paper, these two MBCR are compared with HWMP, which is standardized as routing method of WMN, from simulation results.","PeriodicalId":251023,"journal":{"name":"2015 Eighth International Conference on Mobile Computing and Ubiquitous Networking (ICMU)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125212090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-16DOI: 10.1109/ICMU.2015.7061032
N. Shibuya, B. T. Nukala, Amanda Rodriguez, J. Tsay, Tam Q. Nguyen, S. Zupancic, D. Lie
In this study, we report a custom designed wireless gait analysis sensor (WGAS) system for real-time fall detection using a Support Vector Machine (SVM) classifier. Our WGAS includes a tri-axial accelerometer, 2 gyroscopes and a MSP430 micro-controller. It was worn by the subjects at either the T4 or at the waist level for various intentional falls, Activities of Daily Living (ADL) and the Dynamic Gait Index (DGI) test. The raw data of tri-axial acceleration and angular velocity is wirelessly transmitted from the WGAS to a nearby PC, and then 6 features were extracted for fall classification using a SVM (Support Vector Machine) classifier. We achieved 98.8% and 98.7% fall classification accuracies from the data at the T4 and belt positions, respectively. Moreover, the preliminary data demonstrates an impressive overall specificity of 99.5% and an overall sensitivity of 97.0% for this WGAS real-time fall detection system.
{"title":"A real-time fall detection system using a wearable gait analysis sensor and a Support Vector Machine (SVM) classifier","authors":"N. Shibuya, B. T. Nukala, Amanda Rodriguez, J. Tsay, Tam Q. Nguyen, S. Zupancic, D. Lie","doi":"10.1109/ICMU.2015.7061032","DOIUrl":"https://doi.org/10.1109/ICMU.2015.7061032","url":null,"abstract":"In this study, we report a custom designed wireless gait analysis sensor (WGAS) system for real-time fall detection using a Support Vector Machine (SVM) classifier. Our WGAS includes a tri-axial accelerometer, 2 gyroscopes and a MSP430 micro-controller. It was worn by the subjects at either the T4 or at the waist level for various intentional falls, Activities of Daily Living (ADL) and the Dynamic Gait Index (DGI) test. The raw data of tri-axial acceleration and angular velocity is wirelessly transmitted from the WGAS to a nearby PC, and then 6 features were extracted for fall classification using a SVM (Support Vector Machine) classifier. We achieved 98.8% and 98.7% fall classification accuracies from the data at the T4 and belt positions, respectively. Moreover, the preliminary data demonstrates an impressive overall specificity of 99.5% and an overall sensitivity of 97.0% for this WGAS real-time fall detection system.","PeriodicalId":251023,"journal":{"name":"2015 Eighth International Conference on Mobile Computing and Ubiquitous Networking (ICMU)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121648056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-16DOI: 10.1109/ICMU.2015.7061024
Takuya Eto, H. Habuchi, K. Hashiura
The binary countdown scheme has been investigated as the MAC protocol in the multi-hop network. However, since the conventional binary countdown scheme has the hidden terminal problem, the packet success rate and the throughput are low. In this paper, in order to solve these problems, a novel binary countdown scheme which combines the relaying system with the spread spectrum communication system is proposed. Generalized Modified Prime Sequence Code(GMPSC) is used as pseudo noise(PN) code. The packet success rate and the throughput of the packet transmission is evaluated by the theoretical analysis. Moreover, the proposed scheme is compared with the conventional binary countdown scheme. As a result, it is found that the proposed scheme achieves higher packet success rate than the conventional binary countdown scheme. Moreover, the performance degradation from the ideal packet success rate which is a case when there is no hidden terminal problem becomes small.
{"title":"Spread spectrum/binary countdown scheme with GMPSC for multi-hop wireless network","authors":"Takuya Eto, H. Habuchi, K. Hashiura","doi":"10.1109/ICMU.2015.7061024","DOIUrl":"https://doi.org/10.1109/ICMU.2015.7061024","url":null,"abstract":"The binary countdown scheme has been investigated as the MAC protocol in the multi-hop network. However, since the conventional binary countdown scheme has the hidden terminal problem, the packet success rate and the throughput are low. In this paper, in order to solve these problems, a novel binary countdown scheme which combines the relaying system with the spread spectrum communication system is proposed. Generalized Modified Prime Sequence Code(GMPSC) is used as pseudo noise(PN) code. The packet success rate and the throughput of the packet transmission is evaluated by the theoretical analysis. Moreover, the proposed scheme is compared with the conventional binary countdown scheme. As a result, it is found that the proposed scheme achieves higher packet success rate than the conventional binary countdown scheme. Moreover, the performance degradation from the ideal packet success rate which is a case when there is no hidden terminal problem becomes small.","PeriodicalId":251023,"journal":{"name":"2015 Eighth International Conference on Mobile Computing and Ubiquitous Networking (ICMU)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126983721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-16DOI: 10.1109/ICMU.2015.7061023
Jen-Feng Huang, Guey-Yun Chang, S. Huang, Jyun-Fong Wang
Spectrum sensing is an important issue in cognitive radio networks (CRNs). In the most techniques, the spectrum sensing is performed on secondary users (SUs) in a CRN. For reducing the loading of the SUs, the wireless spectrum sensor networks (WSSNs) [1] have been proposed. In WSSN, sensors should provide the primary user (PU)'s interference range and states (active or inactive) to secondary users (SUs). However, due to the hardware defect and PU signal fading, sensors' reports may be incorrect. In this paper, we propose sensor self-diagnosis algorithms that can help sensors to check the correctness of interference range of the PU. According to the simulation results, our algorithms have lower sensing error rate than prior work.
{"title":"A self-diagnosis method for spectrum sensing algorithm in cognitive radio networks","authors":"Jen-Feng Huang, Guey-Yun Chang, S. Huang, Jyun-Fong Wang","doi":"10.1109/ICMU.2015.7061023","DOIUrl":"https://doi.org/10.1109/ICMU.2015.7061023","url":null,"abstract":"Spectrum sensing is an important issue in cognitive radio networks (CRNs). In the most techniques, the spectrum sensing is performed on secondary users (SUs) in a CRN. For reducing the loading of the SUs, the wireless spectrum sensor networks (WSSNs) [1] have been proposed. In WSSN, sensors should provide the primary user (PU)'s interference range and states (active or inactive) to secondary users (SUs). However, due to the hardware defect and PU signal fading, sensors' reports may be incorrect. In this paper, we propose sensor self-diagnosis algorithms that can help sensors to check the correctness of interference range of the PU. According to the simulation results, our algorithms have lower sensing error rate than prior work.","PeriodicalId":251023,"journal":{"name":"2015 Eighth International Conference on Mobile Computing and Ubiquitous Networking (ICMU)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123554214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-16DOI: 10.1109/ICMU.2015.7061029
TeSheng Tsai, Sheng-Min Chiou, Y. Yang, Shih-Hau Fang, Chiapin Wang, Wen-Hsing Kuo
Quality of Experience (QoE) means how a user perceives the usability of a service when in use (i.e., how satisfied he or she is with a service). This paper proposes a navigation-based approach to facilitating improved QoE of wireless local area networks. By exploiting the spatial information and the pre-measured QoE, the proposed method navigates the user to a suitable location having good experience of the network/services. Performance was evaluated in realistic wireless local area networks, in which QoE is measured as packet successful rate. The results demonstrate that the proposed system successfully navigates users to enjoy sufficient QoE of multimedia applications.
{"title":"Indoor user navigation for enhanced quality of experience in wireless local area networks","authors":"TeSheng Tsai, Sheng-Min Chiou, Y. Yang, Shih-Hau Fang, Chiapin Wang, Wen-Hsing Kuo","doi":"10.1109/ICMU.2015.7061029","DOIUrl":"https://doi.org/10.1109/ICMU.2015.7061029","url":null,"abstract":"Quality of Experience (QoE) means how a user perceives the usability of a service when in use (i.e., how satisfied he or she is with a service). This paper proposes a navigation-based approach to facilitating improved QoE of wireless local area networks. By exploiting the spatial information and the pre-measured QoE, the proposed method navigates the user to a suitable location having good experience of the network/services. Performance was evaluated in realistic wireless local area networks, in which QoE is measured as packet successful rate. The results demonstrate that the proposed system successfully navigates users to enjoy sufficient QoE of multimedia applications.","PeriodicalId":251023,"journal":{"name":"2015 Eighth International Conference on Mobile Computing and Ubiquitous Networking (ICMU)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122621253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-16DOI: 10.1109/ICMU.2015.7061055
Kodai Murakami, Tatsuya Ito, S. Ishihara
The IEEE 802.11 Distributed Coordination Function (DCF) is based on the Carrier Sense Multiple Access (CSMA) algorithm for avoiding collisions of frames. In CSMA, spatial reuse can be improved by suitably changing the carrier sense threshold (CST). If the increased CST does not incur collisions and helps concurrent transmissions from multiple devices, this improves the throughput of the wireless LAN. For example, when there are two APs and multiple devices exist near each of them, each AP can transmit a frame simultaneously without causing collisions of frames since each device can receive a frame from its associated AP with a high signal power and the interference from another AP is small. In this paper, we propose a system which improves the throughput in CSMA/CA based wireless LANs by controlling the CST values of APs according to positions of mobile hosts. In the system, the CST values of multiple APs are dynamically configured by a controller which has a camera for obtaining the current positions of mobile hosts. The proposed system improves the throughput in WLAN 58% in comparison with basic DCF in a LAN where two APs are arranged at an interval of 50 m and two devices exist within 10 m from each AP.
IEEE 802.11分布式协调功能(DCF)是基于CSMA (Carrier Sense Multiple Access)算法来避免帧的冲突。在CSMA中，可以通过适当改变载波感知阈值(CST)来提高空间复用性。如果增加的CST不会引起冲突，并有助于从多个设备并发传输，这将提高无线局域网的吞吐量。例如，当有两个AP并且每个AP附近存在多个设备时，每个AP可以同时发送一帧而不会产生帧冲突，因为每个设备都可以以高信号功率从其关联的AP接收帧，并且来自另一个AP的干扰很小。在本文中，我们提出了一种基于CSMA/CA的无线局域网系统，通过根据移动主机的位置控制ap的CST值来提高吞吐量。在该系统中，多个ap的CST值由带有摄像机的控制器动态配置，用于获取移动主机的当前位置。在局域网中，两个AP以50 m的间隔布置，两个设备在距离每个AP 10 m内，与基本DCF相比，该系统将WLAN的吞吐量提高了58%。
{"title":"Improving the spatial reuse of IEEE 802.11 WLAN by adaptive carrier sense threshold of access points based on node positions","authors":"Kodai Murakami, Tatsuya Ito, S. Ishihara","doi":"10.1109/ICMU.2015.7061055","DOIUrl":"https://doi.org/10.1109/ICMU.2015.7061055","url":null,"abstract":"The IEEE 802.11 Distributed Coordination Function (DCF) is based on the Carrier Sense Multiple Access (CSMA) algorithm for avoiding collisions of frames. In CSMA, spatial reuse can be improved by suitably changing the carrier sense threshold (CST). If the increased CST does not incur collisions and helps concurrent transmissions from multiple devices, this improves the throughput of the wireless LAN. For example, when there are two APs and multiple devices exist near each of them, each AP can transmit a frame simultaneously without causing collisions of frames since each device can receive a frame from its associated AP with a high signal power and the interference from another AP is small. In this paper, we propose a system which improves the throughput in CSMA/CA based wireless LANs by controlling the CST values of APs according to positions of mobile hosts. In the system, the CST values of multiple APs are dynamically configured by a controller which has a camera for obtaining the current positions of mobile hosts. The proposed system improves the throughput in WLAN 58% in comparison with basic DCF in a LAN where two APs are arranged at an interval of 50 m and two devices exist within 10 m from each AP.","PeriodicalId":251023,"journal":{"name":"2015 Eighth International Conference on Mobile Computing and Ubiquitous Networking (ICMU)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133774030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-16DOI: 10.1109/ICMU.2015.7061061
Ryoji Ban, K. Kaji, Kei Hiroi, Nobuo Kawaguchi
In this paper, we propose a high accuracy indoor positioning method that uses residual magnetism in addition to Pedestrian Dead Reckoning (PDR) and WiFi-based localization methods. Our proposed method needs WiFi and magnetic field fingerprints, which are created by measuring in advance the WiFi radio waves and the magnetic field in the target map. The fingerprints are represented by a Gaussian Mixture Models (GMMs) to reduce the amount of computation. Our proposed method estimates positions by comparing the pedestrian sensor and fingerprint values by particle filters. We evaluated this method in real environments and confirmed that it provides accurate indoor positioning with a mean error less than 8 m and more accurate position detection than existing techniques.
{"title":"Indoor positioning method integrating pedestrian Dead Reckoning with magnetic field and WiFi fingerprints","authors":"Ryoji Ban, K. Kaji, Kei Hiroi, Nobuo Kawaguchi","doi":"10.1109/ICMU.2015.7061061","DOIUrl":"https://doi.org/10.1109/ICMU.2015.7061061","url":null,"abstract":"In this paper, we propose a high accuracy indoor positioning method that uses residual magnetism in addition to Pedestrian Dead Reckoning (PDR) and WiFi-based localization methods. Our proposed method needs WiFi and magnetic field fingerprints, which are created by measuring in advance the WiFi radio waves and the magnetic field in the target map. The fingerprints are represented by a Gaussian Mixture Models (GMMs) to reduce the amount of computation. Our proposed method estimates positions by comparing the pedestrian sensor and fingerprint values by particle filters. We evaluated this method in real environments and confirmed that it provides accurate indoor positioning with a mean error less than 8 m and more accurate position detection than existing techniques.","PeriodicalId":251023,"journal":{"name":"2015 Eighth International Conference on Mobile Computing and Ubiquitous Networking (ICMU)","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133470770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-16DOI: 10.1109/ICMU.2015.7061042
Masaki Ogawa, Takuro Yonezawa, Yuuki Nishiyama, J. Nakazawa, H. Tokuda
We propose a novel robot control system by transmitting robot control information on existing video streaming services as dynamic encoded two-dimentional visual code. We implemented sensor data transmitting system by using dynamic encoded two-dimentional visual code which called SENSe-TREAM [1] and we built the robot controlling system by using SENSeTREAM architecture. This paper shows the architecture of robot controlling system and future vision of telepresence and human-robot interaction.
{"title":"A robot control system for video streaming services by using dynamic encoded QR codes","authors":"Masaki Ogawa, Takuro Yonezawa, Yuuki Nishiyama, J. Nakazawa, H. Tokuda","doi":"10.1109/ICMU.2015.7061042","DOIUrl":"https://doi.org/10.1109/ICMU.2015.7061042","url":null,"abstract":"We propose a novel robot control system by transmitting robot control information on existing video streaming services as dynamic encoded two-dimentional visual code. We implemented sensor data transmitting system by using dynamic encoded two-dimentional visual code which called SENSe-TREAM [1] and we built the robot controlling system by using SENSeTREAM architecture. This paper shows the architecture of robot controlling system and future vision of telepresence and human-robot interaction.","PeriodicalId":251023,"journal":{"name":"2015 Eighth International Conference on Mobile Computing and Ubiquitous Networking (ICMU)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123601468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-16DOI: 10.1109/ICMU.2015.7061038
A. Sashima, Ikushi Yoda, M. Kawamoto, K. Kurumatani
In this paper, we describe a web-based service that visualizes sensing data in an urban public space. The sensing data obtained from multiple sensor devices are visualized with three-dimensional graphical models of physical objects (e.g., buildings) in the space to provide a single integrated view of the sensing status in a web browser window. The view is continuously updated based on the latest sensing data so as to show the current status in the space. As the view is rendered by the application that runs within a web browser, the status can be seen from different points of view interactively. We present a service that visualizes human activities, such as pedestrian flows and environmental sounds, based on sensor devices installed in a public space at a shopping center in Tokyo.
{"title":"Web-based integrated visualization service for monitoring urban public spaces","authors":"A. Sashima, Ikushi Yoda, M. Kawamoto, K. Kurumatani","doi":"10.1109/ICMU.2015.7061038","DOIUrl":"https://doi.org/10.1109/ICMU.2015.7061038","url":null,"abstract":"In this paper, we describe a web-based service that visualizes sensing data in an urban public space. The sensing data obtained from multiple sensor devices are visualized with three-dimensional graphical models of physical objects (e.g., buildings) in the space to provide a single integrated view of the sensing status in a web browser window. The view is continuously updated based on the latest sensing data so as to show the current status in the space. As the view is rendered by the application that runs within a web browser, the status can be seen from different points of view interactively. We present a service that visualizes human activities, such as pedestrian flows and environmental sounds, based on sensor devices installed in a public space at a shopping center in Tokyo.","PeriodicalId":251023,"journal":{"name":"2015 Eighth International Conference on Mobile Computing and Ubiquitous Networking (ICMU)","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115412739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-03-16DOI: 10.1109/ICMU.2015.7061063
E. M. Trono, Yutaka Arakawa, M. Tamai, K. Yasumoto
Disaster area map generation and sharing are critical to disaster response operations. In post-disaster contexts however, cloud-based mapping services and data may be unavailable because of network challenges. Disruption Tolerant Network (DTN) architectures have been proposed for data sharing in challenged networks. However, map generation may be too complex for individual DTN nodes given their limited computing resources. To generate and share maps of disaster areas, we present DTN MapEx, a distributed computing system for mapping that operates over a DTN. DTN MapEx distributes disaster map data and map generation tasks to multiple nodes to minimize individual computational loads. In the system, responders and volunteers act as mobile sensing nodes. They log the GPS traces of their traversed paths and collect disaster area map data such as the coordinates, images, and assessments of points-of-interest. The mobile nodes then route their collected data and a task request through the DTN to pre-deployed, fixed Computing Nodes. The Computing Nodes aggregate the data to generate a map and opportunistically route it back to the network. To reduce complexity, mapping tasks and data are divided amongst Computing Nodes based on their current computational load. Computing Nodes periodically update the DTN about their current loads. Mobile nodes use these updates in deciding where to allocate their task requests and data. In this paper, we present the design of DTN MapEx and perform initial evaluations on its feasibility in disaster scenarios.
{"title":"DTN MapEx: Disaster area mapping through distributed computing over a Delay Tolerant Network","authors":"E. M. Trono, Yutaka Arakawa, M. Tamai, K. Yasumoto","doi":"10.1109/ICMU.2015.7061063","DOIUrl":"https://doi.org/10.1109/ICMU.2015.7061063","url":null,"abstract":"Disaster area map generation and sharing are critical to disaster response operations. In post-disaster contexts however, cloud-based mapping services and data may be unavailable because of network challenges. Disruption Tolerant Network (DTN) architectures have been proposed for data sharing in challenged networks. However, map generation may be too complex for individual DTN nodes given their limited computing resources. To generate and share maps of disaster areas, we present DTN MapEx, a distributed computing system for mapping that operates over a DTN. DTN MapEx distributes disaster map data and map generation tasks to multiple nodes to minimize individual computational loads. In the system, responders and volunteers act as mobile sensing nodes. They log the GPS traces of their traversed paths and collect disaster area map data such as the coordinates, images, and assessments of points-of-interest. The mobile nodes then route their collected data and a task request through the DTN to pre-deployed, fixed Computing Nodes. The Computing Nodes aggregate the data to generate a map and opportunistically route it back to the network. To reduce complexity, mapping tasks and data are divided amongst Computing Nodes based on their current computational load. Computing Nodes periodically update the DTN about their current loads. Mobile nodes use these updates in deciding where to allocate their task requests and data. In this paper, we present the design of DTN MapEx and perform initial evaluations on its feasibility in disaster scenarios.","PeriodicalId":251023,"journal":{"name":"2015 Eighth International Conference on Mobile Computing and Ubiquitous Networking (ICMU)","volume":"323 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116777020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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