Yazar "Demir, Alper K." seçeneğine göre listele

Listeleniyor 1 - 5 / 5
  • [ X ]
    Öğe
    Differentiating Emergency Voice Traffic in Indoor Wireless Activity Monitoring Network
    (IEEE, 2014) Demir, Alper K.; Turkes, Okan; Baydere, Sebnem
    We investigate QoS provisioning in a Wireless Activity Monitoring Network(WAMN) when data traffic is a mixture of emergency short voice commands and 3D accelerometer signals for remote monitoring of a group of elderly people living in a health care building. Nodes equipped with acoustic and accelerometer sensors form a multi hop wireless sensor network. The network carries multi class traffic to the sink over a service differentiation protocol for processing. Utilization of limited resources is critical for feasible quality of service. We analyze network performance trade-offs and elaborate on optimal buffer length, MAC retransmission count and transmit power for best achievable voice quality at the sink. Based on the results of extensive simulations, we conclude with some remarks on the tuning off network resources for data segment reliability and voice quality in terms of a novel R-factor metric for the given scenario.
  • [ X ]
    Öğe
    Differentiating emergency voice traffic in indoor wireless activity monitoring network
    (IEEE Computer Society, 2014) Demir, Alper K.; Turkes, Okan; Baydere, Sebnem
    We investigate QoS provisioning in a Wireless Activity Monitoring Network(WAMN) when data traffic is a mixture of emergency short voice commands and 3D accelerometer signals for remote monitoring of a group of elderly people living in a health care building. Nodes equipped with acoustic and accelerometer sensors form a multi hop wireless sensor network. The network carries multi class traffic to the sink over a service differentiation protocol for processing. Utilization of limited resources is critical for feasible quality of service. We analyze network performance trade-offs and elaborate on optimal buffer length, MAC retransmission count and transmit power for best achievable voice quality at the sink. Based on the results of extensive simulations, we conclude with some remarks on the tuning off network resources for data segment reliability and voice quality in terms of a novel R-factor metric for the given scenario. © 2014 IEEE.
  • [ X ]
    Öğe
    DIVA: a distributed divergecast scheduling algorithm for IEEE 802.15.4e TSCH networks
    (Springer, 2019) Demir, Alper K.; Bilgili, Sedat
    IEEE standardized a highly efficient, low power, reliable, deterministic and time-frequency enabled medium access control protocol, IEEE 802.15.4e time slotted channel hopping (TSCH) as an amendment to the medium access control (MAC) protocol defined by the IEEE 802.15.4 standard. Once a communication schedule is built, the IEEE 802.15.4e TSCH is able to execute such a communication schedule. IEEE 802.15.4e TSCH standard lea ves out of scope defining how that communication schedule is built, updated and maintained. In order to fill this gap, we introduce such a scheduling algorithm, called as DIVA. DIVA is specifically designed for IEEE 8092.15.4e TSCH networks. It is a totally distributed scheduling algorithm for divergecast traffic where divergecast means that traffic flows in all directions in contrast to convergecast where traffic flows from leave nodes to root. In order to gain more comprehension about DIVA, we conducted extensive simulations. We also compared DIVA with Berkeley's Aloha-based algorithm.
  • [ X ]
    Öğe
    Fine Tuning Distributed Divergecast Scheduling Algorithms in IEEE 802.15.4e TSCH for Internet of Everything
    (IEEE, 2019) Demir, Alper K.; Bilgili, Sedat
    The concept of the Internet of Everything (IoE) is an area of great interest, with a lot of attention. The fact that it is used in almost all areas makes this concept progress much faster. The devices used in the environments of this concept are required to be minimal in terms of hardware as well as their energy consumption. Although there are different ways of minimizing energy consumption in these devices, one of the most promising protocols that provide mentioned demands is the IEEE 802.15.4e Time Slotted Channel Hopping (TSCH) Medium Access Control (MAC) protocol. This protocol runs on 802.15.4 radio and requires a communication schedule for MAC. How and when these schedules, updates and maintenance will take place are not covered by this protocol. Several solutions are available in the literature to solve these problems. Distributed divergecast Aloha based scheduling and DIVA scheduling algorithms are two of these solutions. Both algorithms make their scheduling according to certain probability calculations. Changing the values of these probability calculations is a novel research with evaluation results in this paper. The aim of this study is to examine the effect of the change in the related probability variables on the performance and try to find the best possible values. It has been observed that the changes in these calculation values have an effect on network converge time.
  • [ X ]
    Öğe
    Fine tuning distributed divergecast scheduling algorithms in IEEE 802.1S.4e TSCH for internet of everything
    (Institute of Electrical and Electronics Engineers Inc., 2019) Demir, Alper K.; Bilgili, Sedat
    The concept of the Internet of Everything (IoE) is an area of great interest, with a lot of attention. The fact that it is used in almost all areas makes this concept progress much faster. The devices used in the environments of this concept are required to be minimal in terms of hardware as well as their energy consumption. Although there are different ways of minimizing energy consumption in these devices, one of the most promising protocols that provide mentioned demands is the IEEE 802.15.4e Time Slotted Channel Hopping (TSCH) Medium Access Control (MAC) protocol. This protocol runs on 802.15.4 radio and requires a communication schedule for MAC. How and when these schedules, updates and maintenance will take place are not covered by this protocol. Several solutions are available in the literature to solve these problems. Distributed divergecast Aloha based scheduling and DIVA scheduling algorithms are two of these solutions. Both algorithms make their scheduling according to certain probability calculations. Changing the values of these probability calculations is a novel research with evaluation results in this paper. The aim of this study is to examine the effect of the change in the related probability variables on the performance and try to find the best possible values. It has been observed that the changes in these calculation values have an effect on network converge time. © 2019 IEEE.