Neeraj Gupta | Hindu College, Delhi University (original) (raw)
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Graduate Center of the City University of New York
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Papers by Neeraj Gupta
Wireless Personal Communications, 2014
The mathematical modeling of IEEE 802.11 CSMA/CA has received considerable attention in the past ... more The mathematical modeling of IEEE 802.11 CSMA/CA has received considerable attention in the past few years. However there is lack of significant work considering the presence of buffer in wireless networks. Also most of the work has not followed IEEE specifications regarding inclusion of retry limits. This paper presents a new analytical model for performance evaluation of IEEE 802.11 single hop networks. The work presented here takes into consideration the presence of first order memory buffer along with the effect of traffic arrival which obeys Poisson distribution. In addition, we have considered the short retry limit to accommodate IEEE 802.11 specifications. On one hand, lack of buffering leads to high delays and under utilization of the channel. Also the absence of short retry limit tends to overestimate the throughput. By accommodating both the shortcomings, it has been proved that our model predicts the behaviour more accurately. We have been carrying out extensive simulations to validate results of our model. We have presented the performance evaluation of both the access mechanisms present in 802.11 MAC protocol.
Scalable Computing: Practice and Experience, 2019
Estimation of available bandwidth for ad hoc networks has always been open and active challenge f... more Estimation of available bandwidth for ad hoc networks has always been open and active challenge for the researchers. A lot of literature is proposed in the last 20 years to evaluate the residual bandwidth. The main objective of the work being admission of new flow in the network with the constraint that any existing current transmission is not affected. One of the prime factors affecting the estimation process is the collision among packets. These collisions trigger the backoff algorithm that leads to wastage of the usable bandwidth. Although a lot of state of art solutions were proposed, but they suffer from various flaws and shortcoming. Other factor contributing to the inaccuracy in existing solution is the mobility of nodes. Node mobility leads to instability of links leading to data losses and delay which impact the bandwidth. The current paper proposes an analytical approach named Analytical Available Bandwidth Estimation Including Mobility (AABWM) to estimate ABW on a link. T...
Wireless communication has proliferated due to the colossal augmentation of smart phones, mobile ... more Wireless communication has proliferated due to the colossal augmentation of smart phones, mobile phones, tablets and laptops etc. Multimedia applications such as live videos, audios, still images, animated graphics and live communications all requires accompaniments of quality of service (QoS) as well as reliable end-to-end transfer of data. Information about the availability of resources in channel is must in order to improve the QoS. QoS can be determined in terms of capacity of channel, available bandwidth (ABW), and bulk transfer capacity (BTC). Bandwidth availability is a key check for improving the QoS in a network. The performance of a multimedia application is directly affected by the bandwidth availability. One of the most important QoS characteristic is ABW at a wireless route and it can be demarcated as least unused capacity of links instituting a network route. Since now there have been many bandwidth estimation techniques are available in the literature to increase the ...
Advances in Intelligent Systems and Computing, 2015
Analytical models help in predicting the change in results once the input parameters of the netwo... more Analytical models help in predicting the change in results once the input parameters of the networks are changed. A lot of modeling work has already been carried out to evaluate the performance of IEEE 802.11 DCF for both saturated networks and non-saturated networks. Most of work considering the arbitrary buffer size nodes in non-saturated conditions uses complex mathematically approach. In the current paper, we present a flexible and practical transform-free approach for evaluating the performance of IEEE 802.11 MAC protocol. The simplicity and fastness of our algorithm is due to the simple closed form expressions to determine idle probability of buffer and blocking probability of buffer with size K assuming each node as a discrete M/G/1/K queue. The proposed model gives accurate results which are validated through ns2 simulations.
Wireless Personal Communications, 2014
The mathematical modeling of IEEE 802.11 CSMA/CA has received considerable attention in the past ... more The mathematical modeling of IEEE 802.11 CSMA/CA has received considerable attention in the past few years. However there is lack of significant work considering the presence of buffer in wireless networks. Also most of the work has not followed IEEE specifications regarding inclusion of retry limits. This paper presents a new analytical model for performance evaluation of IEEE 802.11 single hop networks. The work presented here takes into consideration the presence of first order memory buffer along with the effect of traffic arrival which obeys Poisson distribution. In addition, we have considered the short retry limit to accommodate IEEE 802.11 specifications. On one hand, lack of buffering leads to high delays and under utilization of the channel. Also the absence of short retry limit tends to overestimate the throughput. By accommodating both the shortcomings, it has been proved that our model predicts the behaviour more accurately. We have been carrying out extensive simulations to validate results of our model. We have presented the performance evaluation of both the access mechanisms present in 802.11 MAC protocol.
Scalable Computing: Practice and Experience, 2019
Estimation of available bandwidth for ad hoc networks has always been open and active challenge f... more Estimation of available bandwidth for ad hoc networks has always been open and active challenge for the researchers. A lot of literature is proposed in the last 20 years to evaluate the residual bandwidth. The main objective of the work being admission of new flow in the network with the constraint that any existing current transmission is not affected. One of the prime factors affecting the estimation process is the collision among packets. These collisions trigger the backoff algorithm that leads to wastage of the usable bandwidth. Although a lot of state of art solutions were proposed, but they suffer from various flaws and shortcoming. Other factor contributing to the inaccuracy in existing solution is the mobility of nodes. Node mobility leads to instability of links leading to data losses and delay which impact the bandwidth. The current paper proposes an analytical approach named Analytical Available Bandwidth Estimation Including Mobility (AABWM) to estimate ABW on a link. T...
Wireless communication has proliferated due to the colossal augmentation of smart phones, mobile ... more Wireless communication has proliferated due to the colossal augmentation of smart phones, mobile phones, tablets and laptops etc. Multimedia applications such as live videos, audios, still images, animated graphics and live communications all requires accompaniments of quality of service (QoS) as well as reliable end-to-end transfer of data. Information about the availability of resources in channel is must in order to improve the QoS. QoS can be determined in terms of capacity of channel, available bandwidth (ABW), and bulk transfer capacity (BTC). Bandwidth availability is a key check for improving the QoS in a network. The performance of a multimedia application is directly affected by the bandwidth availability. One of the most important QoS characteristic is ABW at a wireless route and it can be demarcated as least unused capacity of links instituting a network route. Since now there have been many bandwidth estimation techniques are available in the literature to increase the ...
Advances in Intelligent Systems and Computing, 2015
Analytical models help in predicting the change in results once the input parameters of the netwo... more Analytical models help in predicting the change in results once the input parameters of the networks are changed. A lot of modeling work has already been carried out to evaluate the performance of IEEE 802.11 DCF for both saturated networks and non-saturated networks. Most of work considering the arbitrary buffer size nodes in non-saturated conditions uses complex mathematically approach. In the current paper, we present a flexible and practical transform-free approach for evaluating the performance of IEEE 802.11 MAC protocol. The simplicity and fastness of our algorithm is due to the simple closed form expressions to determine idle probability of buffer and blocking probability of buffer with size K assuming each node as a discrete M/G/1/K queue. The proposed model gives accurate results which are validated through ns2 simulations.