The Experts below are selected from a list of 5379 Experts worldwide ranked by ideXlab platform

Kim Jeong Geun - One of the best experts on this subject based on the ideXlab platform.

  • IEEE 802.11 Wireless Local Area Network
    IEEE Communications Magazine, 1997
    Co-Authors: Brian P Crow, Widjaja Indra, Prescott T Sakai, Jeong-geun Kim, Indra Widjaja, Kim Jeong Geun
    Abstract:

    The draft IEEE 802.1 1 Wireless Local Area Network (WLAN) specification IS approaching completion In this article, the IEEE 802.1 1 protocol is explained, with particular emphasis on the medium access control sublayer Performance results are provided for packetized data and a combination of packetized data and voice over the WLAN. Our performance investigation reveals that an IEEE 802 11 suggest that packetized voice traffic must be handled in conjunction with an echo canceler network may be able to carry traffic with time-bounded requirements using the point coordination function However, our findings

C Verikoukis - One of the best experts on this subject based on the ideXlab platform.

  • distributed point coordination function for ieee 802 11 wireless ad hoc networks
    Ad Hoc Networks, 2012
    Co-Authors: Jesus Alonsozarate, C Crespo, Ch Skianis, Luis Alonso, C Verikoukis
    Abstract:

    The Distributed point coordination function (DPCF) is presented in this paper as a novel Medium Access Control Protocol (MAC) for wireless ad hoc networks. DPCF extends the operation of the point coordination function (PCF) defined in the IEEE 802.11 Standard to operate over wireless networks without infrastructure. In PCF, a central point coordinator polls the users to get access to the channel and data collisions are completely avoided, thus yielding high performance. In order to extend its high performance to networks without infrastructure, the DPCF is proposed in this paper as a combination of the Distributed coordination function (DCF) and the PCF. The general idea is to combine a dynamic, temporary, and spontaneous clustering mechanism based on DCF with the execution of PCF within each cluster. The backwards compatibility of DPCF with legacy 802.11 networks is also assessed in this paper. Comprehensive computer-based simulations demonstrate the high performance of this new protocol in both single-hop and multi-hop networks.

  • distributed point coordination function for wireless ad hoc networks
    Vehicular Technology Conference, 2009
    Co-Authors: C Crespo, Jesus Alonsozarate, Luis Alonso, C Verikoukis
    Abstract:

    In this paper we describe a new MAC protocol for ad hoc networks called Distributed point coordination function (DPCF). It constitutes an extension of the PCF of the IEEE 802.11 Standard to operate over infrastructureless networks. It combines both the operation of DCF and PCF. Users get access to the channel through the DCF function. However, once they get access to the channel, they establish a virtual cluster where the PCF coordination function can be executed. The performance of DPCF in single-hop and multi-hop ad hoc networks has been evaluated by means of link-level computer simulation. The results show that DPCF outperforms DCF in terms of throughput and average transmission delay when executed in networks without infrastructure. protocol, a subset of the stations of the network are selected to act as AP after the exchange of "hello" messages. Therefore, the most suitable stations are selected to act as AP. In this paper we present a new MAC protocol called DPCF which is an extension of PCF to operate in infrastructureless networks. Contrary to the MPC-MAC protocol, the goal of DPCF is to improve the performance of ad hoc networks by executing a spontaneous and dynamic clustering mechanism in combination with the PCF function. In DPCF, any station can act as the AP whenever it is necessary, and thus clustering overhead is completely avoided. The remainder of the paper is organized as follows. Both the DCF and the PCF of the Standard are overviewed in Section II and Section III, respectively. DPCF is described in Section IV. The performance evaluation of the protocol in both single-hop and multi-hop networks is presented in Section V and Section VI, respectively. Finally, Section VII concludes the paper.

Brian P Crow - One of the best experts on this subject based on the ideXlab platform.

  • investigation of the ieee 802 11 medium access control mac sublayer functions
    International Conference on Computer Communications, 1997
    Co-Authors: Brian P Crow, Jeong-geun Kim, I Widjaja, Prescott Sakai
    Abstract:

    Analysis of the draft IEEE 802.11 wireless local area network (WLAN) standard is needed to characterize the expected performance of the standard's ad hoc and infrastructure networks. The performance of the medium access control (MAC) sublayer, which consists of distributed coordination function (DCF) and point coordination function (PCF), is determined by simulating asynchronous data traffic in a 1 Mbps ad hoc network, and asynchronous data and packetized voice traffic in a 1 Mbps infrastructure network. The simulation models incorporate the effect of burst errors, packet size, RTS threshold and fragmentation threshold on network throughput and delay. The results show that the IEEE 802.11 WLAN can achieve a reasonably high efficiency when the medium is almost error-free, but may degrade appreciably under harsh fading. The results also show that time-sensitive traffic such as packet voice can be supported together with other intensive traffic such as packet data. However, an echo canceller is required for packet voice systems.

  • IEEE 802.11 Wireless Local Area Network
    IEEE Communications Magazine, 1997
    Co-Authors: Brian P Crow, Widjaja Indra, Prescott T Sakai, Jeong-geun Kim, Indra Widjaja, Kim Jeong Geun
    Abstract:

    The draft IEEE 802.1 1 Wireless Local Area Network (WLAN) specification IS approaching completion In this article, the IEEE 802.1 1 protocol is explained, with particular emphasis on the medium access control sublayer Performance results are provided for packetized data and a combination of packetized data and voice over the WLAN. Our performance investigation reveals that an IEEE 802 11 suggest that packetized voice traffic must be handled in conjunction with an echo canceler network may be able to carry traffic with time-bounded requirements using the point coordination function However, our findings

C Crespo - One of the best experts on this subject based on the ideXlab platform.

  • distributed point coordination function for ieee 802 11 wireless ad hoc networks
    Ad Hoc Networks, 2012
    Co-Authors: Jesus Alonsozarate, C Crespo, Ch Skianis, Luis Alonso, C Verikoukis
    Abstract:

    The Distributed point coordination function (DPCF) is presented in this paper as a novel Medium Access Control Protocol (MAC) for wireless ad hoc networks. DPCF extends the operation of the point coordination function (PCF) defined in the IEEE 802.11 Standard to operate over wireless networks without infrastructure. In PCF, a central point coordinator polls the users to get access to the channel and data collisions are completely avoided, thus yielding high performance. In order to extend its high performance to networks without infrastructure, the DPCF is proposed in this paper as a combination of the Distributed coordination function (DCF) and the PCF. The general idea is to combine a dynamic, temporary, and spontaneous clustering mechanism based on DCF with the execution of PCF within each cluster. The backwards compatibility of DPCF with legacy 802.11 networks is also assessed in this paper. Comprehensive computer-based simulations demonstrate the high performance of this new protocol in both single-hop and multi-hop networks.

  • distributed point coordination function for wireless ad hoc networks
    Vehicular Technology Conference, 2009
    Co-Authors: C Crespo, Jesus Alonsozarate, Luis Alonso, C Verikoukis
    Abstract:

    In this paper we describe a new MAC protocol for ad hoc networks called Distributed point coordination function (DPCF). It constitutes an extension of the PCF of the IEEE 802.11 Standard to operate over infrastructureless networks. It combines both the operation of DCF and PCF. Users get access to the channel through the DCF function. However, once they get access to the channel, they establish a virtual cluster where the PCF coordination function can be executed. The performance of DPCF in single-hop and multi-hop ad hoc networks has been evaluated by means of link-level computer simulation. The results show that DPCF outperforms DCF in terms of throughput and average transmission delay when executed in networks without infrastructure. protocol, a subset of the stations of the network are selected to act as AP after the exchange of "hello" messages. Therefore, the most suitable stations are selected to act as AP. In this paper we present a new MAC protocol called DPCF which is an extension of PCF to operate in infrastructureless networks. Contrary to the MPC-MAC protocol, the goal of DPCF is to improve the performance of ad hoc networks by executing a spontaneous and dynamic clustering mechanism in combination with the PCF function. In DPCF, any station can act as the AP whenever it is necessary, and thus clustering overhead is completely avoided. The remainder of the paper is organized as follows. Both the DCF and the PCF of the Standard are overviewed in Section II and Section III, respectively. DPCF is described in Section IV. The performance evaluation of the protocol in both single-hop and multi-hop networks is presented in Section V and Section VI, respectively. Finally, Section VII concludes the paper.

Jeong-geun Kim - One of the best experts on this subject based on the ideXlab platform.

  • investigation of the ieee 802 11 medium access control mac sublayer functions
    International Conference on Computer Communications, 1997
    Co-Authors: Brian P Crow, Jeong-geun Kim, I Widjaja, Prescott Sakai
    Abstract:

    Analysis of the draft IEEE 802.11 wireless local area network (WLAN) standard is needed to characterize the expected performance of the standard's ad hoc and infrastructure networks. The performance of the medium access control (MAC) sublayer, which consists of distributed coordination function (DCF) and point coordination function (PCF), is determined by simulating asynchronous data traffic in a 1 Mbps ad hoc network, and asynchronous data and packetized voice traffic in a 1 Mbps infrastructure network. The simulation models incorporate the effect of burst errors, packet size, RTS threshold and fragmentation threshold on network throughput and delay. The results show that the IEEE 802.11 WLAN can achieve a reasonably high efficiency when the medium is almost error-free, but may degrade appreciably under harsh fading. The results also show that time-sensitive traffic such as packet voice can be supported together with other intensive traffic such as packet data. However, an echo canceller is required for packet voice systems.

  • IEEE 802.11 Wireless Local Area Network
    IEEE Communications Magazine, 1997
    Co-Authors: Brian P Crow, Widjaja Indra, Prescott T Sakai, Jeong-geun Kim, Indra Widjaja, Kim Jeong Geun
    Abstract:

    The draft IEEE 802.1 1 Wireless Local Area Network (WLAN) specification IS approaching completion In this article, the IEEE 802.1 1 protocol is explained, with particular emphasis on the medium access control sublayer Performance results are provided for packetized data and a combination of packetized data and voice over the WLAN. Our performance investigation reveals that an IEEE 802 11 suggest that packetized voice traffic must be handled in conjunction with an echo canceler network may be able to carry traffic with time-bounded requirements using the point coordination function However, our findings