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Deployment of low power base-stations (referred to as HetNet) within cellular systems can improve system capacity, coverage and enhance users experience. However, the inter-tier and intra-tier interference in such systems can significantly impact overall system performance, which makes interference and spectral resource management more complex. To build, operate HetNet networks, mobile operators have...
Downlink data rates can vary significantly in cellular networks, with a potentially non-negligible effect on the user experience. Content providers address this problem by using different representations (e.g., picture resolution, video resolution and rate) of the same content and switch among these based on measurements collected during the connection. If it were possible to know the achievable data...
The Smart City (SC) approach involves the integration and correlation of information coming from different areas (e.g. power grid management, water distribution, and more) for the optimization of asset management. The SC is like a pervasive sensors and actuator network, where the nodes exchange information, exploiting the power of Internet of Things technologies. A performing and dynamic communication...
With an advancement towards the paradigm of Internet of Things (IoT), in which every device will be interconnected and communicating with each other, the field of wireless sensor networks has helped to resolve an ever-growing demand in meeting deadlines and reducing power consumption. Among several standards that provide support for IoT, the recently published IEEE 802.15.4e protocol is specifically...
4G/LTE (Long Term Evolution) is the state of the art wireless mobile broadband technology. It makes use of the OFDM technology to offer high speed and provides the system resources both in time and frequency domain. A scheduling algorithm running on the base station holds the allocation of these resources. In this paper, the performance of existing downlink scheduling algorithms has been investigated...
The Trafïîc Flow Description (TFD) option is an experimental option of the IP protocol, designed by the Authors, able to assure signaling for QoS purposes. The option is used as a carrier of knowledge about forthcoming traffic. If planning horizons are short enough, this knowledge can be used for dynamic bandwidth allocation. In the paper an analysis of QoS assurance using the TFD option is presented...
Throughput of a mobile ad hoc network (MANET) operating on an unlicensed spectrum can increase if nodes can also transmit on a (shared) licensed spectrum. However, the transmissions on the licensed spectrum has to be limited to avoid degradation of quality of service (QoS) to primary users (PUs). We address the problem of how the nodes of a MANET or secondary users (SUs) should spread their transmissions...
With the rapid development of WLAN, a surge in the number of network users and high-speed data exchange highlight the importance of efficient initial access of MAC layer. The majority of initial access of MAC layer is based on ALOHA or CSMA/CA. With the increase of network traffic, the number of collisions is growing rapidly, resulting in speedy decreasing access success rate and normalized throughput...
Long Term Evolution network or LTE network is a 4G network extension that provides higher data rate by combining multiple technologies and channels through a demand based selection of the appropriate one. This implements an evolved node base station (eNB). The Integrated eNB's in 4G network are responsible for seamless switching between different technologies and channels. Such a switching decision...
We jointly investigate resource allocation along with dynamic activation of energy harvesting base stations in a two-tier heterogeneous network (HetNet) under energy harvesting as well as interference constraints. Considering the varying channel condition, user activity, and arrival of harvested energy in different time slots, we determine resource allocation and dynamic activation of energy harvesting...
Nowadays, cellular operators are facing new challenges to satisfy the future demand of their clients. In addition, user's mobility among multi-tier networks leads to dropping ongoing calls in the system. The introductions of low power nodes and Device-to-Device (D2D) communication into Macro cells are regarded as promising technologies to provide a high data rate. A new design known as Device-for-Device...
NAND flash memory has gained a lot of popularity in recent years, widely used in applications ranging from small mobile devices to high-performance enterprise-class storage. However, the variation and unpredictability of performance caused by concurrent flash translation layer (FTL) tasks in a flash storage system are not desirable qualities especially for real-time systems and make it difficult to...
Recently, Cognitive network has drawn the attention as a promising technology to enhance communication system performance by efficiently utilizing system resources. It provides prompt response to dynamic changes. In this paper, a modified multi-objective particle swarm optimization (M-MOPSO) is proposed in Cognitive IP Multimedia Subsystem (CogIMS) to improve the global network performance. The implementation...
The necessity for a network to provide wireless multimedia services in various levels of quality of service (QoS) with maximizing the utilization of spectral resources. By joint relaying and relay selection we can allocate resources with adaptive resource scheduling. The enhanced coverage and capacity is achieved with the help of small cell deployment. The proposed joint relaying and scheduling strategy...
The handover algorithms implemented in Network Simulator-3 (A3RSRP and A2A4RSRQ) for Long Term Evolution (LTE) so far, under certain scenarios, fail to prevent unnecessary handovers like ping-pong handovers which may lead to poor channel quality. To address this issue, we present A1A3RSRP (based on Reference Signal Received Power (RSRP)) and A1A2A4RSRPRSRQ (based on both RSRP and Reference Signal...
Network packet classification is important network kernel function to enables various network services such as Quality of Service (QoS), security and resource reservation. The OpenFlow protocol is the responsible of the packet classification, it uses a set of rules called ruleset, each rule in that rule set contain a set of matching fields. With the rapid growing of rulesets size and rule fields numbers...
Semantic web services represent the potential of the web and they have significant impact on the discovery process. Due to the high proliferation of web services, selecting the best web services from functional equivalent service providers have become a real challenge when a large number of services have been published in a registry. If these services have been functionally-equivalent, it is difficult...
Small cells, novel low-powered base stations with local range, are nowadays investigated in order to improve the radio coverage and capacity in macro cell layer. The radio frequency exposure induced in such cells is unknown. Hence, we assess in this paper, through experimental measurements, the impact of an LTE small cell cluster on the radio frequency exposure induced by a mobile handset. With respect...
As mobile devices and mobile applications largelygrow, mobile data traffic increases at an unprecedented rate. How to alleviate mobile traffic congestion becomes a widelydiscussed issue. Because that most mobile data is not necessarilyused immediately (e.x. update applications, download a largesize video, etc.), these data are allowed to complete transmissionbefore delay-tolerant deadline. In this...
In wireless networks, providing a high fairness allocation isbecoming a very challenging task. This paper has two objectives:firstly, we proposed a new optimization problem called SatisfactionProbability which consists in maximizing the number of satisfiedusers and secondly, we proposed a new scheduling scheme calledQoE-aware Multi-step Opportunistic (QEMO) scheduler. QEMO is builtin an extended cross-layer...
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