In order to support the quality of service (QoS) requirements at the medium access control (MAC) ... more In order to support the quality of service (QoS) requirements at the medium access control (MAC) layer, the enhanced distributed channel access (EDCA) has been developed in IEEE 802.11e standard. However, it cannot guarantee the stringent real-time constraints of multimedia applications such as voice and video without an efficient method of controlling network loads. In this paper, we propose a measurement-based admission control scheme, which is made up of two parts: priority access and admission control. First, in order to measure the channel status per traffic type, we propose a priority access mechanism in which each priority traffic is distinguished by a busy tone, and separately performs its own packet transmission operation. Then, admission control mechanism protects existing flows from new ones, and maintains the QoS of the admitted flows based on the measured channel status information. Performance of the proposed scheme is evaluated by simulation. Our results show that the proposed scheme is very effective in guaranteeing the QoS of multimedia applications as well as in avoiding the performance starvation of low priority traffics.
2012 15th International Telecommunications Network Strategy and Planning Symposium (NETWORKS), 2012
ABSTRACT In this paper, we tackle the wireless sensor network (WSN) planning problem considering ... more ABSTRACT In this paper, we tackle the wireless sensor network (WSN) planning problem considering coverage, target localization and network connectivity constraints. First, a combinatorial optimization model is proposed for this problem and next, a starting greedy heuristic is proposed followed by a tabu search metaheuristic to find “good” feasible solutions rapidly. The solutions are compared to the optimal solutions found using CPLEX. The test results show the proposed approach finds good quality solutions.
ABSTRACT A temperature level fiber sensor network is proposed and demonstrated. Each inline trans... more ABSTRACT A temperature level fiber sensor network is proposed and demonstrated. Each inline transducer is based on a FBG-SMA wire structure working as an on/off optical device being interrogated using a time domain technique
Structural Health Monitoring (SHM) can be understood as the integration of sensing and intelligen... more Structural Health Monitoring (SHM) can be understood as the integration of sensing and intelligence to enable the structure loading and damage-provoking conditions to be recorded, analyzed, localized, and predicted in such a way that nondestructive testing becomes an integral part of them. In addition, SHM systems can include actuation devices to take proper reaction or correction actions. SHM sensing requirements are very well suited for the application of optical fiber sensors (OFS), in particular, to provide integrated, quasi-distributed or fully distributed technologies. In this tutorial, after a brief introduction of the basic SHM concepts, the main fiber optic techniques available for this application are reviewed, emphasizing the four most successful ones. Then, several examples of the use of OFS in real structures are also addressed, including those from the renewable energy, transportation, civil engineering and the oil and gas industry sectors. Finally, the most relevant current technical challenges and the key sector markets are identified. This paper provides a tutorial introduction, a comprehensive background on this subject and also a forecast of the future of OFS for SHM. In addition, some of the challenges to be faced in the near future are addressed.
International Journal of Ad Hoc and Ubiquitous Computing, 2010
Int. J. Ad Hoc and Ubiquitous Computing, Vol. 5, No. 2, 2010 ... Transport protocol for real-time... more Int. J. Ad Hoc and Ubiquitous Computing, Vol. 5, No. 2, 2010 ... Transport protocol for real-time communication in Wireless Sensor Networks ... Paul Stoina, Alejandro Quintero* and Luis Cobo ... Department of Computer Engineering, École Polytechnique de Montréal, Montreal, ...
In order to support the quality of service (QoS) requirements at the medium access control (MAC) ... more In order to support the quality of service (QoS) requirements at the medium access control (MAC) layer, the enhanced distributed channel access (EDCA) has been developed in IEEE 802.11e standard. However, it cannot guarantee the stringent real-time constraints of multimedia applications such as voice and video without an efficient method of controlling network loads. In this paper, we propose a measurement-based admission control scheme, which is made up of two parts: priority access and admission control. First, in order to measure the channel status per traffic type, we propose a priority access mechanism in which each priority traffic is distinguished by a busy tone, and separately performs its own packet transmission operation. Then, admission control mechanism protects existing flows from new ones, and maintains the QoS of the admitted flows based on the measured channel status information. Performance of the proposed scheme is evaluated by simulation. Our results show that the proposed scheme is very effective in guaranteeing the QoS of multimedia applications as well as in avoiding the performance starvation of low priority traffics.
In order to support the quality of service (QoS) requirements at the medium access control (MAC) ... more In order to support the quality of service (QoS) requirements at the medium access control (MAC) layer, the enhanced distributed channel access (EDCA) has been developed in IEEE 802.11e standard. However, it cannot guarantee the stringent real-time constraints of multimedia applications such as voice and video without an efficient method of controlling network loads. In this paper, we propose a measurement-based admission control scheme, which is made up of two parts: priority access and admission control. First, in order to measure the channel status per traffic type, we propose a priority access mechanism in which each priority traffic is distinguished by a busy tone, and separately performs its own packet transmission operation. Then, admission control mechanism protects existing flows from new ones, and maintains the QoS of the admitted flows based on the measured channel status information. Performance of the proposed scheme is evaluated by simulation. Our results show that the proposed scheme is very effective in guaranteeing the QoS of multimedia applications as well as in avoiding the performance starvation of low priority traffics.
2012 15th International Telecommunications Network Strategy and Planning Symposium (NETWORKS), 2012
ABSTRACT In this paper, we tackle the wireless sensor network (WSN) planning problem considering ... more ABSTRACT In this paper, we tackle the wireless sensor network (WSN) planning problem considering coverage, target localization and network connectivity constraints. First, a combinatorial optimization model is proposed for this problem and next, a starting greedy heuristic is proposed followed by a tabu search metaheuristic to find “good” feasible solutions rapidly. The solutions are compared to the optimal solutions found using CPLEX. The test results show the proposed approach finds good quality solutions.
ABSTRACT A temperature level fiber sensor network is proposed and demonstrated. Each inline trans... more ABSTRACT A temperature level fiber sensor network is proposed and demonstrated. Each inline transducer is based on a FBG-SMA wire structure working as an on/off optical device being interrogated using a time domain technique
Structural Health Monitoring (SHM) can be understood as the integration of sensing and intelligen... more Structural Health Monitoring (SHM) can be understood as the integration of sensing and intelligence to enable the structure loading and damage-provoking conditions to be recorded, analyzed, localized, and predicted in such a way that nondestructive testing becomes an integral part of them. In addition, SHM systems can include actuation devices to take proper reaction or correction actions. SHM sensing requirements are very well suited for the application of optical fiber sensors (OFS), in particular, to provide integrated, quasi-distributed or fully distributed technologies. In this tutorial, after a brief introduction of the basic SHM concepts, the main fiber optic techniques available for this application are reviewed, emphasizing the four most successful ones. Then, several examples of the use of OFS in real structures are also addressed, including those from the renewable energy, transportation, civil engineering and the oil and gas industry sectors. Finally, the most relevant current technical challenges and the key sector markets are identified. This paper provides a tutorial introduction, a comprehensive background on this subject and also a forecast of the future of OFS for SHM. In addition, some of the challenges to be faced in the near future are addressed.
International Journal of Ad Hoc and Ubiquitous Computing, 2010
Int. J. Ad Hoc and Ubiquitous Computing, Vol. 5, No. 2, 2010 ... Transport protocol for real-time... more Int. J. Ad Hoc and Ubiquitous Computing, Vol. 5, No. 2, 2010 ... Transport protocol for real-time communication in Wireless Sensor Networks ... Paul Stoina, Alejandro Quintero* and Luis Cobo ... Department of Computer Engineering, École Polytechnique de Montréal, Montreal, ...
In order to support the quality of service (QoS) requirements at the medium access control (MAC) ... more In order to support the quality of service (QoS) requirements at the medium access control (MAC) layer, the enhanced distributed channel access (EDCA) has been developed in IEEE 802.11e standard. However, it cannot guarantee the stringent real-time constraints of multimedia applications such as voice and video without an efficient method of controlling network loads. In this paper, we propose a measurement-based admission control scheme, which is made up of two parts: priority access and admission control. First, in order to measure the channel status per traffic type, we propose a priority access mechanism in which each priority traffic is distinguished by a busy tone, and separately performs its own packet transmission operation. Then, admission control mechanism protects existing flows from new ones, and maintains the QoS of the admitted flows based on the measured channel status information. Performance of the proposed scheme is evaluated by simulation. Our results show that the proposed scheme is very effective in guaranteeing the QoS of multimedia applications as well as in avoiding the performance starvation of low priority traffics.
Uploads
Papers by luis cobo