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This paper introduces a new innovation for the analytical model to improve the throughput performance and energy efficiency for ideal channel conditions by the integration which challenges both fountain code and Markov chain modeling. In this context, the energy consumption is a critical resource that can be saved by minimizing the number of transmissions to be performed in the network. Channel contention...
This work aims at understanding and evaluating the impact of using different path loss models in the optimization trade-off of small cell (SC) networks. In LTE-A, the more realistic propagation models are the more efficient the radio and network optimization becomes. In this work we compare four urban path loss models: the urban/vehicular and pedestrian test environment from the ITU-R M. 1255 Report...
Recent advances in the electronics for wireless communications is enabling transceivers to transmit and receive signals at the same time. Thus, the so called full duplex (FD) radios will soon be introduced in devices as opposed to traditional half duplex (HD). However, although FD radios allow to almost double the capacity of a single link, the advantage obtained in a network is still debated and...
The main goal of this study is the analytical modeling of the packets rejection at destination due to the receiver collisions in WDM LANs. Especially, an efficient synchronous transmission WDMA protocol suitable for passive star topology is proposed that takes under account the collisions over the WDM channels, while it considers the receiver collisions phenomenon. In each station, a set of parallel...
In this paper, an accurate analytical performance study of a multi-channel network is derived, based on the probability theory. Especially, we mathematically model the performance of a multi-channel network, such as a wireless or an optical WDM network, assuming both the collisions over the multiple channels and the destination conflicts. The receiver collisions phenomenon is extensively studied,...
This paper proposes an asynchronous transmission WDMA protocol for passive star optical networks, considering the propagation delay effect. We aim to reduce the rejection probability at destination due to the receiver collisions and consequently to enhance the system throughput, by assuming two -instead of one-tunable receivers per node. An analytical model is developed for the performance evaluation,...
The packet rejection at destination under asynchronous transmission in high-speed optical fiber networks is examined in this study. Especially, we propose an asynchronous transmission protocol and a station network interface suitable for local area networks of passive star topology aiming to reduce the rejection probability at destination due to the receiver collisions. We assume that each station...
The rapid growth of high-speed transit systems, such as High Speed Rail (HSR), is putting considerable pressure on TCP-based data transmission. It is well known that TCP is suffering from severe throughput degradation in high-speed mobility scenarios. The root cause at the transport layer however remains unclear and largely undetermined to date. In this paper, we aim to pinpoint the throughput bottlenecks...
In the literature, the network throughput of slotted Aloha with the capture model over fading channels has been found to be higher than e−1, the maximum network throughput of slotted Aloha with the collision model over ideal channel conditions. Such an improvement is often misinterpreted as the result of channel fading, which as we will demonstrate in this paper, indeed comes from the receiver. Specifically,...
This paper presents a new innovation network architecture for the analytical model by the integration which challenges both fountain code and Markov chain modeling to improve the throughput performance for ideal channel conditions. In this context, the collision result in corrupted packets and the following MAC layer retransmissions consume extra energy. Channel contention is a serious problem in...
For wireless mesh networks using the IEEE 802.11 family of standards, carrier sensing mechanisms such as physical carrier sensing and virtual carrier sensing play a key role in determining goodput and overall network performance. However, inaccurate modelling of the effect of carrier sensing on goodput leads to poor decision making in mesh network roll out. More accurate models can be derived by analysing...
This paper proposes a MAC protocol using multiple control channels for multi-channel ad-hoc network. In the proposed protocol, all channels are divided into some groups. Each group has a control channel. All nodes hops the control channels for searching a receiver. Because of using multiple control-channels, control frame collisions and the effect of searching overhead are mitigated in the proposed...
In a multi-rate wireless data network, the data rate is a function of the distance from the Access Point (AP). To extend the coverage range of the data network and to increase the throughput to a target terminal outside the AP coverage range, relay nodes are inserted between the AP and the target terminal. Therefore, for a given throughput-distance relationship, and a given distance between the access...
Physical carrier sensing (PCS) is an effective mechanism to reduce the collision and interference caused by hidden terminals in wireless ad hoc networks, which allows nodes to be separated by a silent margin. However, potential simultaneous transmissions may be suppressed in this silent margin due to exposed terminal problem. As a consequence, PCS mechanism affects the network performance in two opposite...
A hidden-node problem is one of the major challenges that cause severe performance degradation in wireless ad-hoc networks. Even though RTS/CTS (Request To Send/Clear To Send) exchange can remove the hidden-node problem, the inefficiency of exchanging the RTS/CTS has brought attentions to many researchers. While most of these efforts have been focused on the theoretical analysis, very little efforts...
Stop-and-Wait protocol is one of the main flow error control mechanisms that enables destination entities to regulate the flow of packets sent by source entities. Modeling and simulation form some of the most important topics in the communication field, aiming to analyze and provide platforms that incorporate real-world system operations. Recently, SimEvents toolbox emerged as a promising tool for...
In this paper, we present an analysis model for the estimation of channel utilization for IEEE 802.11 ad hoc networks under saturated conditions in the presence of hidden terminals. We give a way to calculate the saturated throughout of multi-hop scenario. The ns-2 simulation results show the effectiveness of our analytical approach.
In this paper, we design and analyze a new 802.11- based cooperative MAC protocol. Since the wireless fading interval sometimes is comparable to the time of multiple-frame transmission, the traditional retransmission schemes may not be optimal. We consider designing a multi- relay system where neighbor nodes can assist the retransmission in order to achieve transmission diversity and combat channel...
Network throughput of the best-effort networks as typified by the Internet and wireless networks is often insufficient for multimedia communication, and it spoils the quality of communication. Therefore, it is important to analyze a dynamic characteristics of the throughput when multimedia traffic is injected. We point out that the dynamics of the throughput has the viscosity and the elasticity because...
More and more data centers are built using commodity TCP/IP and Ethernet networks because of their low cost and ease-of-use. But TCP would experience catastrophic throughput collapse in a communication pattern, termed "Incast", where multiple senders simultaneously send data to a receiver. This phenomenon potentially arises in many typical applications, such as distributed storage, Map Reduce...
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