The Experts below are selected from a list of 5964 Experts worldwide ranked by ideXlab platform
Micheal Drieberg - One of the best experts on this subject based on the ideXlab platform.
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delay analysis of enhanced relay enabled distributed coordination function
Vehicular Technology Conference, 2010Co-Authors: Rizwan Ahmad, Fuchun Zheng, Micheal DriebergAbstract:This paper analyzes the delay performance of Enhanced relay-enabled distributed coordination function (ErDCF) for wireless ad hoc networks under ideal condition and in the presence of transmission errors. Relays are nodes capable of supporting high data rates for other low data rate nodes. In ideal channel ErDCF achieves higher throughput and reduced energy consumption compared to IEEE 802.11 distributed coordination function (DCF). This gain is still maintained in the presence of errors. It is also expected of relays to reduce the delay. However, the impact on the delay behavior of ErDCF under transmission errors is not known. In this work, we have presented the impact of transmission errors on delay. It turns out that under transmission errors of sufficient magnitude to increase dropped packets, packet delay is reduced. This is due to increase in the probability of failure. As a result the packet drop time increases, thus reflecting the throughput degradation.
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VTC Spring - Delay Analysis of Enhanced Relay-Enabled distributed coordination function
2010 IEEE 71st Vehicular Technology Conference, 2010Co-Authors: Rizwan Ahmad, Fuchun Zheng, Micheal DriebergAbstract:This paper analyzes the delay performance of Enhanced relay-enabled distributed coordination function (ErDCF) for wireless ad hoc networks under ideal condition and in the presence of transmission errors. Relays are nodes capable of supporting high data rates for other low data rate nodes. In ideal channel ErDCF achieves higher throughput and reduced energy consumption compared to IEEE 802.11 distributed coordination function (DCF). This gain is still maintained in the presence of errors. It is also expected of relays to reduce the delay. However, the impact on the delay behavior of ErDCF under transmission errors is not known. In this work, we have presented the impact of transmission errors on delay. It turns out that under transmission errors of sufficient magnitude to increase dropped packets, packet delay is reduced. This is due to increase in the probability of failure. As a result the packet drop time increases, thus reflecting the throughput degradation.
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analysis of enhanced relay enabled distributed coordination function under transmission errors
Vehicular Technology Conference, 2009Co-Authors: Rizwan Ahmad, Fuchun Zheng, Micheal Drieberg, Michael FitchAbstract:This paper analyzes the performance of enhanced relay-enabled distributed coordination function (ErDCF) for wireless ad hoc networks under transmission errors. The idea of ErDCF is to use high data rate nodes to work as relays for the low data rate nodes. ErDCF achieves higher throughput and reduces energy consumption compared to IEEE 802.11 distributed coordination function (DCF) in an ideal channel environment. However, there is a possibility that this expected gain may decrease in the presence of transmission errors. In this work, we modify the saturation throughput model of ErDCF to accurately reflect the impact of transmission errors under different rate combinations. It turns out that the throughput gain of ErDCF can still be maintained under reasonable link quality and distance.
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VTC Fall - Analysis of Enhanced Relay-Enabled distributed coordination function under Transmission Errors
2009 IEEE 70th Vehicular Technology Conference Fall, 2009Co-Authors: Rizwan Ahmad, Fuchun Zheng, Micheal Drieberg, Michael FitchAbstract:This paper analyzes the performance of enhanced relay-enabled distributed coordination function (ErDCF) for wireless ad hoc networks under transmission errors. The idea of ErDCF is to use high data rate nodes to work as relays for the low data rate nodes. ErDCF achieves higher throughput and reduces energy consumption compared to IEEE 802.11 distributed coordination function (DCF) in an ideal channel environment. However, there is a possibility that this expected gain may decrease in the presence of transmission errors. In this work, we modify the saturation throughput model of ErDCF to accurately reflect the impact of transmission errors under different rate combinations. It turns out that the throughput gain of ErDCF can still be maintained under reasonable link quality and distance.
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Impact of transmission errors in enhanced relay-enabled distributed coordination function
2008Co-Authors: Rizwan Ahmad, Fuchun Zheng, Micheal DriebergAbstract:This paper analyzes the performance of Enhanced relay-enabled distributed coordination function (ErDCF) for wireless ad hoc networks under transmission errors. The idea of ErDCF is to use high data rate nodes to work as relays for the low data rate nodes. ErDCF achieves higher throughput and reduces energy consumption compared to IEEE 802.11 distributed coordination function (DCF) in an ideal channel environment. However, there is a possibility that this expected gain may decrease in the presence of transmission errors. In this work, we modify the saturation throughput model of ErDCF to accurately reflect the impact of transmission errors under different rate combinations. It turns out that the throughput gain of ErDCF can still be maintained under reasonable link quality and distance.
Rizwan Ahmad - One of the best experts on this subject based on the ideXlab platform.
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delay analysis of enhanced relay enabled distributed coordination function
Vehicular Technology Conference, 2010Co-Authors: Rizwan Ahmad, Fuchun Zheng, Micheal DriebergAbstract:This paper analyzes the delay performance of Enhanced relay-enabled distributed coordination function (ErDCF) for wireless ad hoc networks under ideal condition and in the presence of transmission errors. Relays are nodes capable of supporting high data rates for other low data rate nodes. In ideal channel ErDCF achieves higher throughput and reduced energy consumption compared to IEEE 802.11 distributed coordination function (DCF). This gain is still maintained in the presence of errors. It is also expected of relays to reduce the delay. However, the impact on the delay behavior of ErDCF under transmission errors is not known. In this work, we have presented the impact of transmission errors on delay. It turns out that under transmission errors of sufficient magnitude to increase dropped packets, packet delay is reduced. This is due to increase in the probability of failure. As a result the packet drop time increases, thus reflecting the throughput degradation.
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VTC Spring - Delay Analysis of Enhanced Relay-Enabled distributed coordination function
2010 IEEE 71st Vehicular Technology Conference, 2010Co-Authors: Rizwan Ahmad, Fuchun Zheng, Micheal DriebergAbstract:This paper analyzes the delay performance of Enhanced relay-enabled distributed coordination function (ErDCF) for wireless ad hoc networks under ideal condition and in the presence of transmission errors. Relays are nodes capable of supporting high data rates for other low data rate nodes. In ideal channel ErDCF achieves higher throughput and reduced energy consumption compared to IEEE 802.11 distributed coordination function (DCF). This gain is still maintained in the presence of errors. It is also expected of relays to reduce the delay. However, the impact on the delay behavior of ErDCF under transmission errors is not known. In this work, we have presented the impact of transmission errors on delay. It turns out that under transmission errors of sufficient magnitude to increase dropped packets, packet delay is reduced. This is due to increase in the probability of failure. As a result the packet drop time increases, thus reflecting the throughput degradation.
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analysis of enhanced relay enabled distributed coordination function under transmission errors
Vehicular Technology Conference, 2009Co-Authors: Rizwan Ahmad, Fuchun Zheng, Micheal Drieberg, Michael FitchAbstract:This paper analyzes the performance of enhanced relay-enabled distributed coordination function (ErDCF) for wireless ad hoc networks under transmission errors. The idea of ErDCF is to use high data rate nodes to work as relays for the low data rate nodes. ErDCF achieves higher throughput and reduces energy consumption compared to IEEE 802.11 distributed coordination function (DCF) in an ideal channel environment. However, there is a possibility that this expected gain may decrease in the presence of transmission errors. In this work, we modify the saturation throughput model of ErDCF to accurately reflect the impact of transmission errors under different rate combinations. It turns out that the throughput gain of ErDCF can still be maintained under reasonable link quality and distance.
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VTC Fall - Analysis of Enhanced Relay-Enabled distributed coordination function under Transmission Errors
2009 IEEE 70th Vehicular Technology Conference Fall, 2009Co-Authors: Rizwan Ahmad, Fuchun Zheng, Micheal Drieberg, Michael FitchAbstract:This paper analyzes the performance of enhanced relay-enabled distributed coordination function (ErDCF) for wireless ad hoc networks under transmission errors. The idea of ErDCF is to use high data rate nodes to work as relays for the low data rate nodes. ErDCF achieves higher throughput and reduces energy consumption compared to IEEE 802.11 distributed coordination function (DCF) in an ideal channel environment. However, there is a possibility that this expected gain may decrease in the presence of transmission errors. In this work, we modify the saturation throughput model of ErDCF to accurately reflect the impact of transmission errors under different rate combinations. It turns out that the throughput gain of ErDCF can still be maintained under reasonable link quality and distance.
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Impact of transmission errors in enhanced relay-enabled distributed coordination function
2008Co-Authors: Rizwan Ahmad, Fuchun Zheng, Micheal DriebergAbstract:This paper analyzes the performance of Enhanced relay-enabled distributed coordination function (ErDCF) for wireless ad hoc networks under transmission errors. The idea of ErDCF is to use high data rate nodes to work as relays for the low data rate nodes. ErDCF achieves higher throughput and reduces energy consumption compared to IEEE 802.11 distributed coordination function (DCF) in an ideal channel environment. However, there is a possibility that this expected gain may decrease in the presence of transmission errors. In this work, we modify the saturation throughput model of ErDCF to accurately reflect the impact of transmission errors under different rate combinations. It turns out that the throughput gain of ErDCF can still be maintained under reasonable link quality and distance.
Yang Xiao - One of the best experts on this subject based on the ideXlab platform.
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Refinements on IEEE 802.11 distributed coordination function Modeling Approaches
IEEE Transactions on Vehicular Technology, 2010Co-Authors: Ilenia Tinnirello, Giuseppe Bianchi, Yang XiaoAbstract:With the popularity of the IEEE 802.11 standards, many analytical saturation throughput studies for the distributed coordination function (DCF) have been reported. In this paper, we outline a number of issues and criticalities raised by previously proposed models. In particular, a careful look at backoff counter decrement rules allows us to conclude that, under saturation conditions, the slot immediately following a successful transmission can be accessed only by the station (STA) that has successfully transmitted in the previous channel access. Moreover, due to the specific acknowledgment (ACK) timeout setting adopted in the standard, the slot immediately following a collision cannot be accessed by any STA. Thus, the hypothesis of uncorrelation between consecutive channel slots and statistical homogeneity is not generally true. We propose a new backoff decrement model that retains the simplicity of traditional DCF models while being able to take into account such a correlation, and we compare the accuracy of our model with that of previously proposed approaches.
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ieee 802 11 distributed coordination function service time and queuing delay analysis using parallel space time markov chain
Personal Indoor and Mobile Radio Communications, 2008Co-Authors: Kaveh Ghaboosi, Yang Xiao, Matti Latvaaho, Babak Hossein KhalajAbstract:In this paper, using the so-called parallel space-time Markov chain (PSTMC) framework we analyze the IEEE 802.11 distributed coordination function (DCF) frame service time, jitter, and queuing delay in a single-hop non-saturated wireless network. PSTMC framework provides the possibility of simultaneous modeling of backoff and post-backoff procedures, in addition to the transmission queue status of a non-saturated 802.11 station. To the best of our knowledge, the presented contribution is the first analysis of service time, i.e., access delay and retransmission delay, plus queuing delay at the same time, when the precise modeling of binary exponential backoff (BEB) scheme in medium access control (MAC) layer is the main issue of concern. The model is validated by extensive simulations, showing its remarkable level of accuracy.
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finite load analysis of ieee 802 11 distributed coordination function
International Conference on Communications, 2008Co-Authors: Kaveh Ghaboosi, Matti Latvaaho, Yang XiaoAbstract:Many performance evaluations for IEEE 802.11 distributed coordination function (DCF) have been formerly reported in the literature; most studies are based on saturation analysis, and a few models under a finite load condition adopt an M/G/l queuing system. However, using M/G/l queuing only considers the first moment of frame service time to derive the probability of transmission queue being vacant. In this paper, we model the DCF using Parallel Space-Time Markov Chain (PSTMC), in which frame arrivals are tracked by monitoring the transmission queue during transitions between successive states of the space-time Markov chain. The proposed framework provides the possibility of modeling the contention phase, backoff and post-backoff procedures, and the transmission queue status. The proposed framework is validated by the simulation results.
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ICC - Finite Load Analysis of IEEE 802.11 distributed coordination function
2008 IEEE International Conference on Communications, 2008Co-Authors: Kaveh Ghaboosi, Matti Latva-aho, Yang XiaoAbstract:Many performance evaluations for IEEE 802.11 distributed coordination function (DCF) have been formerly reported in the literature; most studies are based on saturation analysis, and a few models under a finite load condition adopt an M/G/l queuing system. However, using M/G/l queuing only considers the first moment of frame service time to derive the probability of transmission queue being vacant. In this paper, we model the DCF using Parallel Space-Time Markov Chain (PSTMC), in which frame arrivals are tracked by monitoring the transmission queue during transitions between successive states of the space-time Markov chain. The proposed framework provides the possibility of modeling the contention phase, backoff and post-backoff procedures, and the transmission queue status. The proposed framework is validated by the simulation results.
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PIMRC - IEEE 802.11 distributed coordination function service time and queuing delay analysis using Parallel Space - Time Markov Chain
2008 IEEE 19th International Symposium on Personal Indoor and Mobile Radio Communications, 2008Co-Authors: Kaveh Ghaboosi, Matti Latva-aho, Yang Xiao, Babak Hossein KhalajAbstract:In this paper, using the so-called parallel space-time Markov chain (PSTMC) framework we analyze the IEEE 802.11 distributed coordination function (DCF) frame service time, jitter, and queuing delay in a single-hop non-saturated wireless network. PSTMC framework provides the possibility of simultaneous modeling of backoff and post-backoff procedures, in addition to the transmission queue status of a non-saturated 802.11 station. To the best of our knowledge, the presented contribution is the first analysis of service time, i.e., access delay and retransmission delay, plus queuing delay at the same time, when the precise modeling of binary exponential backoff (BEB) scheme in medium access control (MAC) layer is the main issue of concern. The model is validated by extensive simulations, showing its remarkable level of accuracy.
Yun Sang Park - One of the best experts on this subject based on the ideXlab platform.
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joint fragment size transmission rate and request to send clear to send threshold optimization for ieee 802 11b distributed coordination function
Vehicular Technology Conference, 2005Co-Authors: A.v. Garmonov, Stanislav Filin, A.y. Savinkov, V.b. Manelis, S.n. Moiseev, M.s. Kondakov, Seok Ho Cheon, Ki Tae Han, Do Hyon Yim, Yun Sang ParkAbstract:In this paper we theoretically perform joint fragment size, transmission rate, and request-to-send/clear-to-send threshold optimization for IEEE 802.11b distributed coordination function considering both collisions due to system load and frame errors due to non-ideal channel conditions. We have chosen system throughput maximization as the optimization criteria.
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joint fragment size and transmission rate optimization for request to send clear to send mechanism of ieee 802 11b distributed coordination function
Personal Indoor and Mobile Radio Communications, 2005Co-Authors: A.v. Garmonov, Stanislav Filin, A.y. Savinkov, V.b. Manelis, S.n. Moiseev, M.s. Kondakov, Seok Ho Cheon, Ki Tae Han, Do Hyon Yim, Yun Sang ParkAbstract:In this paper we theoretically perform joint fragment size and transmission rate optimization for request-to-send/clear-to-send mechanism of IEEE 802.11b distributed coordination function considering both collisions due to system load and frame errors due to nonideal channel conditions. We have chosen system throughput maximization as the optimization criteria
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Joint fragment size and transmission rate optimization for basic access mechanism of IEEE 802.11b distributed coordination function
The European Conference on Wireless Technology 2005., 1Co-Authors: Stanislav Filin, A.v. Garmonov, A.y. Savinkov, V.b. Manelis, S.n. Moiseev, M.s. Kondakov, Seok Ho Cheon, Hyon Yim, Ki Tae Han, Yun Sang ParkAbstract:In this paper we theoretically perform joint fragment size and transmission rate optimization for basic access mechanism of IEEE 802.11b distributed coordination function considering both collisions due to system load and frame errors due to non-ideal channel conditions. We have chosen system throughput maximization as the optimization criteria
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Joint fragment size, transmission rate, and request-to-send/clear-to-send threshold optimization for IEEE 802.11b distributed coordination function
2005 IEEE 61st Vehicular Technology Conference, 1Co-Authors: A.v. Garmonov, Stanislav Filin, A.y. Savinkov, V.b. Manelis, S.n. Moiseev, M.s. Kondakov, Seok Ho Cheon, Hyon Yim, Ki Tae Han, Yun Sang ParkAbstract:In this paper we theoretically perform joint fragment size, transmission rate, and request-to-send/clear-to-send threshold optimization for IEEE 802.11b distributed coordination function considering both collisions due to system load and frame errors due to non-ideal channel conditions. We have chosen system throughput maximization as the optimization criteria.
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PIMRC - Joint Fragment Size and Transmission Rate Optimization for Request-to-Send/Clear-to-send Mechanism of IEEE 802.11b distributed coordination function
2005 IEEE 16th International Symposium on Personal Indoor and Mobile Radio Communications, 1Co-Authors: A.v. Garmonov, Stanislav Filin, A.y. Savinkov, V.b. Manelis, S.n. Moiseev, M.s. Kondakov, Seok Ho Cheon, Hyon Yim, Ki Tae Han, Yun Sang ParkAbstract:In this paper we theoretically perform joint fragment size and transmission rate optimization for request-to-send/clear-to-send mechanism of IEEE 802.11b distributed coordination function considering both collisions due to system load and frame errors due to nonideal channel conditions. We have chosen system throughput maximization as the optimization criteria
Michael Fitch - One of the best experts on this subject based on the ideXlab platform.
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analysis of enhanced relay enabled distributed coordination function under transmission errors
Vehicular Technology Conference, 2009Co-Authors: Rizwan Ahmad, Fuchun Zheng, Micheal Drieberg, Michael FitchAbstract:This paper analyzes the performance of enhanced relay-enabled distributed coordination function (ErDCF) for wireless ad hoc networks under transmission errors. The idea of ErDCF is to use high data rate nodes to work as relays for the low data rate nodes. ErDCF achieves higher throughput and reduces energy consumption compared to IEEE 802.11 distributed coordination function (DCF) in an ideal channel environment. However, there is a possibility that this expected gain may decrease in the presence of transmission errors. In this work, we modify the saturation throughput model of ErDCF to accurately reflect the impact of transmission errors under different rate combinations. It turns out that the throughput gain of ErDCF can still be maintained under reasonable link quality and distance.
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VTC Fall - Analysis of Enhanced Relay-Enabled distributed coordination function under Transmission Errors
2009 IEEE 70th Vehicular Technology Conference Fall, 2009Co-Authors: Rizwan Ahmad, Fuchun Zheng, Micheal Drieberg, Michael FitchAbstract:This paper analyzes the performance of enhanced relay-enabled distributed coordination function (ErDCF) for wireless ad hoc networks under transmission errors. The idea of ErDCF is to use high data rate nodes to work as relays for the low data rate nodes. ErDCF achieves higher throughput and reduces energy consumption compared to IEEE 802.11 distributed coordination function (DCF) in an ideal channel environment. However, there is a possibility that this expected gain may decrease in the presence of transmission errors. In this work, we modify the saturation throughput model of ErDCF to accurately reflect the impact of transmission errors under different rate combinations. It turns out that the throughput gain of ErDCF can still be maintained under reasonable link quality and distance.