The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
With the rapid development of wireless network and communication technology, mobility in wireless network is essential issue represents challenges because of the requirement of continuous connectivity. Process switching from one base station to another is known as handover (HO). Parameters like traffic received and traffic sent, throughput, jitter, load, delay, received power, and signal to noise...
Long Term Evolution (LTE) is the new generation wireless networks that support all IP transmission for multimedia services. One of the major challenges in LTE network is to provide the packet scheduling scheme that can supports the Quality-of-Service (QoS) requirements of multimedia services. In this paper, a Quality-of-Service (QoS) aware packet scheduler for Real Time (RT) downlink communication...
Recent trend of network communication is leading towards the innovation of high speed wireless broadband technology. The scheduling of real-time traffic in certain network will give high impact on the system, so the most efficient scheduling is crucial. This paper proposes an energy-efficient resource allocation scheduler with QoS aware support for LTE network. The ultimate aim is to promote and achieve...
Recently, femtocell attains a lot of attention for its capability to offer extended coverage from macrocell to indoor subscribers. The deployment of Femtocell may cause Inter Cell Interference (ICI) between Femtocells and Macrocell due to the same set of frequency reuse. The characteristic of cognitive radio helps in efficiently utilizing the frequency spectrum, both in the licensed and unlicensed...
Long Term Evolution (LTE) is a breakthrough in broadband technology, which aims to support several high level quality and real time multimedia services for mobile users which were important concern in the preceding generation of mobile networks. In this paper, a Quality-of-Service (QoS) aware packet scheduler for Real Time (RT) downlink communication in LTE was designed. A resource block (RB) preserver...
Self-Organizing Network (SON) mechanism comprises of three components of self-configuration, self-optimization and self-healing which can contribute to optimize the performance of the next generation broadband network such as the Long Term Evolution (LTE) networks. The aim of this study is to propose a self-organizing handover procedure based on the Self-Organizing Network (SON) concept for LTE network...
Self-Organizing Network (SON) mechanism comprises of three components of self-configuration, self-optimization and self-healing which can contribute to optimize the performance of the next generation broadband network such as the Long Term Evolution (LTE) networks. The aim of this study is to propose a self-organizing handover procedure based on the Self-Organizing Network (SON) concept for LTE network...
Long Term Evolution (LTE) is a breakthrough in broadband technology which aims to support several high level quality and real time multimedia services for the mobile users. This paper proposes a resource block preserver (RBP) scheduling algorithm which optimizes the performance of the downlink transmission system in LTE network. The resource block preserver algorithm has two layers, upper and lower...
The IEEE 802.11n network standard does not specify the scheduling mechanism for the packet aggregation and treats the packet the same without distinguishing them between real time and none real time. In this study, we have proposed a fair scheduling algorithm for the A-MSDU aggregation that transmits the MSDUs according to their priority based on their lifetime. The simulation results show an outstanding...
The challenge of removing redundant handover (HO) has gained more importance after the existence and deployment of femtocell in the network. By nature, the existence of femtocell can lead to the increase of handover initiation. However, 3GPP standard provides Mobility Robustness Optimization (MRO) to optimize handover performance. MRO is a use-case for Self-Organizing Network (SON). The conventional...
Presently, the network simulator 2 (ns-2) is a common and popular simulation tool for the IEEE 802.11 wireless networks, mobile ad hoc networks (MANETs) and wireless sensor network (IEEE 802.15.4). However, the network module for the IEEE 802.15.7 module has not been developed for the ns-2. In this paper, we have designed and implemented the medium access control (MAC) protocol based on IEEE 802.15...
The IP multimedia subsystem (IMS) functionality is designed to work on a variety of wireless access technologies and in all network coverage such as macrocell, microcell and femtocell. In this paper we have implemented an IMS registration procedure for the LTE-based femtocell networks. Additionally, we proposed the SIP based IMS framework mechanism for LTE-based femtocell implementation. Two processes...
Femtocell or Home eNode cell in LTE is a home base station that anticipated to be deployed in very large numbers with fully automated manner. Femtocell provides enhanced coverage for in-building cellular services. The enhanced data rates enable new multimedia services which in turn generate new revenue. However, with all the convenience such device can provide, locating the user's geographic location...
The aim of designing the architecture for the IP multimedia subsystem is to provide fixed and mobile multimedia services independent of the access network technologies. One of these access networks is the 4th generation broadband LTE which supports femtocell deployment as to improve the indoor end-user experience. In this work we proposed an IMS module for the signalling in the LTE-based femtocell...
The vertex-colouring problem is a well-known classical problem in graph theory in which a colour is assigned to each vertex of the graph such that no two adjacent vertices have the same colour. The minimum vertex-colouring problem is known as NP-hard problem in an arbitrary graph. In this paper a graph colouring algorithm based on modified incidence matrix is proposed for resolving Physical Cell ID...
IEEE 802.15.7 is introduced to standardize the visible light communication system for connecting devices via visible light spectrum. A slotted CSMA/CA MAC protocol defined in the standard to coordinate channel access for numbers of the optical wireless devices. In this paper, we proposed a simple Discrete Time Markov Chain (DTMC) model for modeling the behavior of the Contention Access Period (CAP)...
Physical Cell Identity (PCI) assignments and conflicts are still posing huge challenges in the LTE-femtocell based network. This challenges stem from the problem of only 504 unique PCls are available in the LTE network. In this work we propose an approach to solve this problem with minimum needs of human intervention, besides preserving the network resources by discarding the need of periodically...
The great increase in user demand to roam among various wired and wireless communications networks without affecting the signal quality has attracted many researchers to investigate about the best handover decision criteria that promote seamless handover. IEEE 802.21 Media Independent Handover (MIH) standard can be considered to be the best environment for handling both horizontal and vertical handover...
The IEEE 802.16j Mobile Multi-hop Relay (MMR) WiMAX networks allow the extension of the coverage area of a WiMAX network by deploying a relay station (RS). In WiMAX, subscriber station (SS) located non Line-of-sight (LOS) with the BS suffers from deterioration in service. In this paper, we investigate the usage of RS in improving the per-user throughput. Simulations are performed using OPNET Modeler...
The IEEE 802.11n network main feature is to support high throughput of more than 100Mbps at the MAC layer. To achieve this, the 802.11n Task Group has introduced frame aggregation technique which reduces the overhead and increases the channel utilization efficiency. The MAC layer defines two frame aggregation mechanisms namely the MAC protocol data unit aggregation A-MPDU and MAC service data unit...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.