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In this work, we present a mode selection scheme in a hybrid cellular-device to device system. Our model includes a cellular user, a potential device to device user and its receiver. The potential device to device user has different options for its transmission. We introduce a new criteria for mode selection, which has the advantage of being implemented in distributed form. We provide simulation results...
In this paper, we study the propagation of deadline- constrained content over wireless cellular network, in which the base station transmits a content to a certain set of users. The lifetime of a content is consumed in two aspects: waiting in the queue and transmitting. In our system, the base station first transmits the content to users with a certain data rate, such that some users may not directly...
There has been a high focus latest years to investigate possible methods for Over-The-Air tests facilitating multi-antenna technologies. This paper presents a method of testing mobile device receive performance when the base station utilise transmit diversity (TM2) in the downlink. The method uses a reverberation chamber combined with a channel emulator, and results for three commercially available...
Measurements have been used for the analysis of an LTE system, which may be used for vehicle applications. The analyzed system consists of an LTE communication tester simulating a base station and a mobile phone. To obtain repeatable measurement results the RF ports of the communicating nodes were connected with cables. The susceptibility of the mobile to interfering signals with various characteristics...
In cellular networks Device to Device (D2D) communication is used to improve the resource utilization and the throughput. SNR Based Master-Slave Dynamic D2D Communication Algorithm (SMSDCA) is proposed to improve the resource utilization of the cellular network and improved Quality of Service (QoS). It is achieved by allocating some User Equipment (UE) as master in that cluster based on SNR and energy,...
Cellular based M2M systems generate massive number of access requests which create congestion in the cellular network. The contention-based random access procedures are designed for cellular networks which cannot accommodate a large number of M2M traffic. In this paper, a contention-based slotted Aloha random access procedure for M2M network is first analyzed using different performance metrics. The...
Nowadays the rapid growth of user data rate requirement prompts dense deployment of small cell. However, the dense deployment strategy will bring in new interference problem due to the short distance between cells. Coordinated Multiple Point (CoMP) transmission is considered to be an effective way to mitigate Inter-Cell Interference (ICI). In this paper, we propose a novel CoMP transmission algorithm...
LTE-Advanced and Femtocell are deployed by cellular operators to improve the coverage and capacity to respond the demand for higher data rates in wireless networks. Integration of femtocell into cellular network faced interference between femtocell and macrocell. Several scenarios based on Fractional Frequency Reuse (FFR) methods have been proposed to mitigate this interference, including integer...
The integration of WiFi and WiMAX will allow a seamless connection between users for both connections with larger capacity, higher speeds and mobility access. A special router is needed to allow the interconnection between two different protocol network known as WiFi/WiMAX router. In this paper, we investigate and simulated based on the scenario using OPNET modeler simulation tools and compared their...
This paper proposes a novel Resource Scheduling (RS) method by using Hybrid Broadcasting and Cellular Networks (HBCN). In this approach, the hot or common information is assigned with higher priority levels and is preferentially scheduled. The Equivalent Throughput (ET) and fairness are redefined and discussed. Simulations show the ETs of the networks are improved by using the proposed algorithms,...
Random access algorithm is critical for the performance of interactive broadcasting system. Random access with Dynamic Window Size and Random Access Slots(D-WS-RAS) is proposed as an efficient way to tackle this problem in the interactive broadcasting system. This algorithm is composed of three parts: utilize Bayes' rule to estimate the number of access, dynamically set backoff window size and dynamically...
This paper develops a model evaluating the impact of mobility in heterogeneous wireless networks by the way of analytical expressions of the spatio-temporal evolution of QoS indicators. Such formulas are obtained by introducing a multiuser averaged mobility pattern named density of users. Among the set of densities, we use a Gaussian form of this quantity, which results from a modeling method based...
The rapidly increasing penetration of smart phones and the associated exponential growth in the wireless data traffic result in an increasing energy consumption and, consequently, greater carbon dioxide (CO2) emissions. However, on account of operational costs and environmental worries, this increase should be taken into consideration for future cellular networks evolution. In this paper, we study...
We consider the problem of scheduling transmissions over a wireless downlink when channel state information (CSI) is not available to the transmitter. We assume channel states are time varying and evolve according to a Markov Chain. We show that using current QLI does not stabilize the system due to correlations between backlog and channel state. We show that the throughput optimal scheduling policy...
Unlicensed LTE system holds high potential to effectively offload data traffic/video traffic from the crowded LTE networks. Listen-before-talk is generally necessary for unlicensed LTE to coexist with existing transmissions in the unlicensed band (e.g. wireless LAN). This paper studies the interaction of clear channel assessment (how hard one should listen before talk) and transmit power control (how...
To tackle the challenge of providing higher data rates within limited spectral resources we consider the case of multiple operators sharing a common pool of radio resources in the downlink. The goal is to maintain a long term fairness of spectrum sharing with a no coordination among small cell base stations. It is assumed that the spectral allocations of the small cells are orthogonal to the macro...
The use of the unlicensed spectrum by LTE networks (LTE-U or LAA-LTE) is being considered by mobile operators in order to satisfy increasing traffic demands and to make better use of the licensed spectrum. However, coexistence issues arise when LTE-U coverage overlaps with other technologies currently operating in unlicensed bands, in particular WiFi. Since LTE uses a TDMA/OFDMA scheduled approach,...
In recent years, wireless networks (including WLANs and cellular networks) have been widely deployed in enterprise, public areas and homes. In wireless networks, users are observed to act collaboratively rather than arriving or leaving independently. In this paper, we have analysed real WiFitraces deployed in an enterprise in 2012 and cellular network traces from a urban areas in China in 2013. We...
WiMAX (World Wide Interoperability for Microwave Access) is a standard based technology based on IEEE 802.16 Air Interface. This standard is the future mode of mobile communication. Therefore, it is important to evaluate the performance of WiMAX in different scenarios. In this paper we have presented performance analysis of WiMAX for the CBR (Constant Bit Rate) traffic with and without mobility. Two...
This paper studies a cross-layer technique to increase the powering of an LTE macro base station from renewable energy. The cross-layer technique integrates the management of the transmit antennas and LTE frames with, at the application layer, video compression factor and data traffic delay. Importantly, the management of these cellular network components is integrated with the base station energy...
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