The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform

Jiang Wen-xian - One of the best experts on this subject based on the ideXlab platform.

  • IEEE802.15.4 Guaranteed Time Slot performance analysis and allocation optimization under multi-Slot
    Journal of Computer Applications, 2012
    Co-Authors: Jiang Wen-xian
    Abstract:

    Every Guaranteed Time Slot(GTS) mechanism in IEEE 802.15.4 standard can be allocated multiple Slots to guarantee the real-Time data transmission.For the lack of analyzing multi-Slot GTS performances under contention free period,the network calculus,was used to analyze the service curves of delay bound and throughput,and the connection with energy consumption.The IEEE802.15.4 sensor node model which has proposed by Jurcik and Koubaa has been improved,and modeling and simulation were done to study how GTS parameters influenced the network performances(delay,throughput and energy consumption).The simulation results indicate that according to high or low burst data rate,there is an optimized allocation of GTS parameters to meet the real-Time data transmission.

Xu You-zhi - One of the best experts on this subject based on the ideXlab platform.

  • Research on Real-Time Access Sensor Networks
    Computer Simulation, 2008
    Co-Authors: Xu You-zhi
    Abstract:

    To guarantee Real-Time communication in sensor networks, request and locating Guaranteed Time Slot (GTS) of IEEE 802.15.4 were researched. Petri net model about GTS request and locating were put forward. After simulation, it shows, in star sensor networks, if GTS request is more than 7 Slots at same Time, response Time will be not satisfied the common real Time system. If there are more than 28 Slots, some request will be lost.

Peter S. Excell - One of the best experts on this subject based on the ideXlab platform.

Hussein T. Mouftah - One of the best experts on this subject based on the ideXlab platform.

  • WCNC - Tuning Guaranteed Time Slots of IEEE 802.15.4 for transformer health monitoring in the smart grid
    2014 IEEE Wireless Communications and Networking Conference (WCNC), 2014
    Co-Authors: Irfan Al-anbagi, Melike Erol-kantarci, Hussein T. Mouftah
    Abstract:

    Wireless Sensor Networks (WSNs) are anticipated to become the preferred tools of choice for monitoring and controlling power utility assets in the smart grid due to their versatility. However, in some smart grid monitoring applications, data generation rates could fluctuate rapidly due to the sudden occurrence of critical faults or failures in the monitored equipment. As a consequence, critical data could experience excessive delays because of this increase in the packet arrival rates. In this paper, we present an Adaptive Guaranteed Time Slot (GTS) allocation scheme (AGTS) for IEEE 802.15.4-based WSNs used in high traffic intensity smart grid monitoring applications. AGTS scheme can adaptively reduce the end-to-end delay and flexibly tune the GTS to provide the required Quality of Service (QoS) differentiation to delay critical smart grid monitoring applications. The proposed scheme can adaptively allocate the needed GTS to nodes transmitting high priority traffic or draw back the unneeded GTS.

Eduardo Tovar - One of the best experts on this subject based on the ideXlab platform.

  • ETFA - An Explicit GTS allocation algorithm for IEEE 802.15.4
    ETFA2011, 2011
    Co-Authors: Jianxin Chen, Luis Lino Ferreira, Eduardo Tovar
    Abstract:

    The IEEE 802.15.4 standard provides appealing features to simultaneously support real-Time and non realTime traffic, but it is only capable of supporting real-Time communications from at most seven devices. Additionally, it cannot guarantee delay bounds lower than the superframe duration. Motivated by this problem, in this paper we propose an Explicit Guaranteed Time Slot Sharing and Allocation scheme (EGSA) for beacon-enabled IEEE 802.15.4 networks. This scheme is capable of providing tighter delay bounds for real-Time communications by splitting the Contention Free access Period (CFP) into smaller mini Time Slots and by means of a new Guaranteed bandwidth allocation scheme for a set of devices with periodic messages. At the same the novel bandwidth allocation scheme can maximize the duration of the CFP for non real-Time communications. Performance analysis results show that the EGSA scheme works efficiently and outperforms competitor schemes both in terms of Guaranteed delay and bandwidth utilization.

  • ECRTS - i-GAME: an implicit GTS allocation mechanism in IEEE 802.15.4 for Time-sensitive wireless sensor networks
    18th Euromicro Conference on Real-Time Systems (ECRTS'06), 1
    Co-Authors: Anis Koubaa, Mário Alves, Eduardo Tovar
    Abstract:

    The IEEE 802.15.4 medium access control (MAC) protocol is an enabling technology for Time sensitive wireless sensor networks thanks to its Guaranteed-Time Slot (GTS) mechanism in the beacon-enabled mode. However, the protocol only supports explicit GTS allocation, i.e. a node allocates a number of Time Slots in each superframe for exclusive use. The limitation of this explicit GTS allocation is that GTS resources may quickly disappear, since a maximum of seven GTSs can be allocated in each superframe, preventing other nodes to benefit from Guaranteed service. Moreover, the GTSs may be only partially used, resulting in wasted bandwidth. To overcome these limitations, this paper proposes i-GAME, an implicit GTS allocation mechanism in beacon-enabled IEEE 802.15.4 networks. The allocation is based on implicit GTS allocation requests, taking into account the traffic specifications and the delay requirements of the flows. The i-GAME approach enables the use of a GTS by multiple nodes, while all their (delay, bandwidth) requirements are still satisfied. For that purpose, we propose an admission control algorithm that enables to decide whether to accept a new GTS allocation request or not, based not only on the remaining Time Slots, but also on the traffic specifications of the flows, their delay requirements and the available bandwidth resources. We show that our proposal improves the bandwidth utilization compared to the explicit allocation used in the IEEE 802.15.4 protocol standard. We also present some practical considerations for the implementation of i-GAME, ensuring backward compatibility with the IEEE 801.5.4 standard with only minor add-ons.