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In this paper we study the role of control/status channel in MAC protocol of cognitive radio networks. To this end we consider three channel access schemes of IEEE 802.11 DCF namely (i) the Basic Access mechanism that uses no control channel and (ii) RTS-CTS mechanism, that uses a control channel for contention and (iii) cooperative Basic Access scheme that uses a dedicated channel for status update...
Cell range extension (CRE) has been used as a method to extend the coverage of small cells and help offload macro cell users to small cells by adding a cell specific offset (CSO) to small cells in heterogeneous network deployment. However, previous literatures only considered CSO setting in sparse small cell networks (SCN) deployment where the number of small cells is relatively small. In this paper,...
New sophisticated solutions are required in next generation networks to provide appropriate quality of service for users. The introduction of small cells in Long Term Evolution (LTE) raises numerous problems along with undoubted advantages to the engineers and researchers. In this paper a new handover decision algorithm is described for two-tier macrocell-small cell LTE-Advanced (LTE-A) using network...
Bluetooth Low Energy (BLE) is a recently developed energy-efficient short-range radio communication technology, which is currently vastly gaining popularity and which might become an enabler for implementing in practice the Internet of Things (IoT) concept. However, the complexity of the protocol and the lack of the simulation tools impedes the studies of BLE network performance. For this reason,...
Evaluating the performance of a computer system requires the use of representative workloads. Therefore it is customary to use recorded job traces in simulations to evaluate the performance of proposed parallel job schedulers. We argue that this practice retains unimportant attributes of the workload, at the expense of other more important attributes. Specifically, using traces in open-system simulations...
Efficient and accurate network simulation techniques are critical for evaluating protocols and systems at scale. For example, the magnitude of modern data center deployments requires the use of fast simulation techniques in order to evaluate newly proposed algorithms and system architectures. Unfortunately, efficient simulation can come at the cost of accuracy and realism. In this work-in-progress...
Multifunction vehicle bus (MVB) which obeyed to IEC 61375-1 standard is implied inside the train vehicle as international standard. The measurement index of MVB network dynamic performance including network efficiency, network utilization and network throughput is put forward in this paper. A simulation model based on matlab\simulink is built to evaluate and analyze MVB network dynamic performance...
Recent advances in physical layer communication techniques, enable receivers to decode multiple simultaneous transmissions. This technique is known as the multipacket reception (MPR). In this paper, we propose an enhancement to the IEEE 802.11ac EDCA protocol for channels supporting MPR for QoS provisioning. We show that in the case of MPR, in addition to CWmin, CWmax and AIFSN, we can use two more...
In cognitive radio (CR) networks, unlicensed users (or secondary users, SUs) can explore and exploit white spaces, which are the underutilized licensed channels, conditional on acceptable interference to the licensed users (or primary users, PUs). This paper investigates the effects of network characteristics on the network performance of a routing scheme called Cognitive Radio Q-routing (CRQ-routing),...
One of the most challenging issues in cooperative wireless networks at the medium access control (MAC) layer is to select a good helper (relay node) to start cooperation. The helpers' information is often stored in a CoopTable and updated via overhearing of the helpers' traffic. However, when the helpers are transmitting data infrequently or having random mobility, the cooperation may suffer from...
Multi-Channel Wi-Fi experiments are quickly becoming more common and relevant as Wi-Fi deployments have become extremely popular and dense in recent years. There are many simulation tools available for Wi-Fi simulation, but few are widely used, and some are not designed specifically with wireless in mind. In this paper, the NS3 environment is recognized as a promising tool for which for this type...
Device-to-device (D2D) communication has been widely studied in academic and industry due to its contribution in improved resource utilization. As the radio resource can be reused by multiple D2D links, complicated intracell interference environment is caused. In this paper, we analyze the performance of resource allocation schemes in D2D communications, considering the dynamic data arrival with finite...
Vehicular communication, as a novel fundamental platform for providing wireless access, is drawing more and more attentions in recent years. IEEE 802.11p is a main radio access technology which supports communication for high mobility terminals. Due to the small coverage, road side unit (RSU) is usually deployed coupling with cellular network to achieve seamless mobility. In cellular/802.11p heterogeneous...
In recent years, femtocells, which could enhance the indoor coverage, have attracted widely attention. The interference among femtocells is not ignorable when the deployment is extremely dense. In this paper, a novel component carrier selection scheme, which includes two algorithms, i.e. BCCS (Basic Component Carrier Selection) algorithm and ECCS (Enhance Component Carrier Selection) algorithm, is...
Topology-transparent scheduling algorithms can work well in mobile ad hoc networks, since they are oblivious to the network topology changes and can provide throughput and delay guarantees. Recently, it has been shown that topology-transparent algorithms can provide comparable or even better performance, compared to topology-dependent algorithms. However, most existing topology-transparent scheduling...
Cognitive radio can improve the spectrum efficiency by allowing multiple secondary users to access the idle licensed spectrum, for which efficient and fair spectrum sharing is one of the key challenges. In this paper, we investigate the multiuser multi-channel spectrum allocation problem in cognitive radio networks with the objective of maximizing the minimum throughput among all the cognitive pairs...
In this paper, a throughput-driven design technique is proposed, in which a suspicious timing error prediction circuit is inserted to monitor the signal transitions at some selected check points. Unlike previous works where timing errors are detected after their occurrence, the proposed method tries to use the real intermediate signal transitions for timing error prediction. The check point selection...
This paper addresses security and performance issues of MANET. A novel cluster oriented concept is proposed to enhance security and efficiency of the network. Proposed strategy insures the optimum performance of MANET in presence of black hole attack. The simulation of the proposed methodology is carried out using NS2 network simulator and the simulation results reflects the performance of scheme...
We propose a new method for full-duplex self-interference cancellation. The proposed scheme uses a precoder to align the self-interference channel with orthogonal direction of detection axis. The simulation result shows that the proposed RP-SIC enhances the average throughput of user equipment compared to the conventional scheme in high residual self-interference region.
This work investigates co-primary spectrum sharing problem in the local area indoor dense deployment scenario. A spectrum sharing method and relevant mechanism are designed to achieve flexible spectrum usage amongst multiple operator networks. This proposed solution improves spectrum efficiency by making small cells more flexibly and efficiently utilize whole spectrum resources via intra operator...
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