527 research outputs found
Recommended from our members
Call admission control using cell breathing concept for wideband CDMA
This paper presents a Call Admission Control
(CAC) algorithm based fuzzy logic to maintain the quality of
service using cell breathing concept. When a new call is accepted
by a cell, its current user is generally affected due to cell
breathing. The proposed CAC algorithm accepts a new call only
if the current users in the cell are not jeopardized. Performance
evaluation is done for single-cell and multicell scenarios. In
multicell scenario dynamic assignment of users to the
neighboring cell, so called handoff, has been considered to
achieve a lower blocking probability. Handoff and new call
requests are assumed with handoff being given preference using
a reserved channel scheme. CAC for different types of services
are shown which depend upon the bandwidth requirement for
voice, data and video. Distance, arrival rate, bandwidth and nonorthogonality
factor of the signal are considered for making the
call acceptance decision. The paper demonstrates that fuzzy logic
with the cell breathing concept can be used to develop a CAC
algorithm to achieve a better performance evaluation
Final report on the evaluation of RRM/CRRM algorithms
Deliverable public del projecte EVERESTThis deliverable provides a definition and a complete evaluation of the RRM/CRRM algorithms selected in D11 and D15, and evolved and refined on an iterative process. The evaluation will be carried out by means of simulations using the simulators provided at D07, and D14.Preprin
HANDOVER MANAGEABILITY AND PERFORMANCE MODELING IN MOBILE COMMUNICATION NETWORKS
In cellular Networks, a mobile station (MSâs) move from one cell region to another on seamless Communicationscheduling.. Handoff or Handover is an essential issue for the seamless communication. Several approaches havebeen proposed for handoff performance analysis in mobile communication systems. In Code-Division Multiple-Access (CDMA) systems with soft handoff, mobile stations (MSâs) within a soft-handoff region (SR) use multipleradio channels and receive their signals from multiple base stations (BSâs) simultaneously. Consequently, SRâsshould be investigated for handoff analysis in CDMA systems. In this paper, a model for soft handoff in CDMAnetworks is developed by initiating an overlap region between adjacent cells facilitating the derivation of handoffmanageability performance model. We employed an empirical modelling approach to support our analyticalfindings, measure and investigated the performance characteristics of typical communication network over a specificperiod from March to June, 2013 in an established cellular communication network operator in Nigeria. Theobserved data parameters were used as model predictors during the simulation phase. Simulation results revealedthat increased system capacity degrades the performance of the network due to congestion, dropping and callblocking, which the system is most likely to experience, but the rate of those factors could be minimized by properlyconsidering the handoff probabilities level. Comparing our results, we determined the effective and efficientperformance model and recommend it to network operators for an enhanced Quality of Service (QoS), which willpotentially improve the cost-value ratio for mobile users and thus confirmed that Soft Handoff (SH) performancemodel should be carefully implemented to minimize cellular communication system defects.Keywords: CDMA, QoS, optimization, Handoff Manageability, Congestion, Call Blocking and Call Dropping,
4. generĂĄciĂłs mobil rendszerek kutatĂĄsa = Research on 4-th Generation Mobile Systems
A 3G mobil rendszerek szabvĂĄnyosĂtĂĄsa a vĂŠgĂŠhez kĂśzeledik, legalĂĄbbis a meghatĂĄrozĂł kĂŠpessĂŠgek tekintetĂŠben. EzĂŠrt lĂŠtfontossĂĄgĂş azon technikĂĄk, eljĂĄrĂĄsok vizsgĂĄlata, melyek a kĂśvetkezĹ, 4G rendszerekben meghatĂĄrozĂł szerepet tĂśltenek majd be. TĂśbb ilyen kutatĂĄsi irĂĄnyvonal is lĂŠtezik, ezek kĂśzĂźl projektĂźnkben a fontosabbakra koncentrĂĄltunk. A kĂśvetkezĹben felsoroljuk a kutatott terĂźleteket, ĂŠs rĂśviden ĂśsszegezzĂźk az elĂŠrt eredmĂŠnyeket. SzĂłrt spektrumĂş rendszerek KifejlesztettĂźnk egy Ăşj, rĂĄdiĂłs interfĂŠszen alkalmazhatĂł hĂvĂĄsengedĂŠlyezĂŠsi eljĂĄrĂĄst. SzimulĂĄciĂłs vizsgĂĄlatokkal tĂĄmasztottuk alĂĄ a megoldĂĄs hatĂŠkonysĂĄgĂĄt. A projektben kutatĂłkĂŠnt rĂŠsztvevĹ Jeney GĂĄbor sikeresen megvĂŠdte Ph.D. disszertĂĄciĂłjĂĄt neurĂĄlis hĂĄlĂłzatokra ĂŠpĂźlĹ tĂśbbfelhasznĂĄlĂłs detekciĂłs technikĂĄk tĂŠmĂĄban. Az elĂŠrt eredmĂŠnyek Imre SĂĄndor MTA doktori disszertĂĄciĂłjĂĄba is beĂŠpĂźltek. IP alkalmazĂĄsa mobil rendszerekben TovĂĄbbfejlesztettĂźk, teszteltĂźk ĂŠs ĂĄltalĂĄnosĂtottuk a projekt keretĂŠben megalkotott Ăşj, gyĹąrĹą alapĂş topolĂłgiĂĄra ĂŠpĂźlĹ, a jelenleginĂŠl nagyobb megbĂzhatĂłsĂĄgĂş IP alapĂş hozzĂĄfĂŠrĂŠsi koncepciĂłt. A tĂŠmakĂśrben Szalay MĂĄtĂŠ Ph.D. disszertĂĄciĂłja mĂĄr a nyilvĂĄnos vĂŠdĂŠsig jutott. Kvantum-informatikai mĂłdszerek alkalmazĂĄsa 3G/4G detekciĂłra Ăj, kvantum-informatikai elvekre ĂŠpĂźlĹ tĂśbbfelhasznĂĄlĂłs detekciĂłs eljĂĄrĂĄst dolgoztunk ki. Ehhez Ăşj kvantum alapĂş algoritmusokat is kifejlesztettĂźnk. Az eredmĂŠnyeket nemzetkĂśzi folyĂłiratok mellett egy sajĂĄt kĂśnyvben is publikĂĄltuk. | The project consists of three main research directions. Spread spectrum systems: we developed a new call admission control method for 3G air interfaces. Project member Gabor Jeney obtained the Ph.D. degree and project leader Sandor Imre submitted his DSc theses from this area. Application of IP in mobile systems: A ring-based reliable IP mobility mobile access concept and corresponding protocols have been developed. Project member MĂĄtĂŠ Szalay submitted his Ph.D. theses from this field. Quantum computing based solutions in 3G/4G detection: Quantum computing based multiuser detection algorithm was developed. Based on the results on this field a book was published at Wiley entitled: 'Quantum Computing and Communications - an engineering approach'
An intelligent-agent approach for managing congestion in W-CDMA networks
PhDResource Management is a crucial aspect in the next generation cellular networks
since the use of W-CDMA technology gives an inherent flexibility in managing the
system capacity. The concept of a âService Level Agreementâ (SLA) also plays a
very important role as it is the means to guarantee the quality of service provided to
the customers in response to the level of service to which they have subscribed.
Hence there is a need to introduce effective SLA-based policies as part of the radio
resource management.
This work proposes the application of intelligent agents in SLA-based control in
resource management, especially when congestion occurs. The work demonstrates the
ability of intelligent agents in improving and maintaining the quality of service to
meet the required SLA as the congestion occurs.
A particularly novel aspect of this work is the use of learning (here Case Based
Reasoning) to predict the control strategies to be imposed. As the system environment
changes, the most suitable policy will be implemented. When congestion occurs, the
system either proposes the solution by recalling from experience (if the event is
similar to what has been previously solved) or recalculates the solution from its
knowledge (if the event is new). With this approach, the system performance will be
monitored at all times and a suitable policy can be immediately applied as the system
environment changes, resulting in maintaining the system quality of service
Performance Evaluation of v-eNodeB using Virtualized Radio Resource Management
With the demand upsurge for high bandwidth services, continuous increase in the number of cellular subscriptions, adoption of Internet of Things (IoT), and marked growth in Machine-to-Machine (M2M) traffic, there is great stress exerted on cellular network infrastructure. The present wireline and wireless networking technologies are rigid in nature and heavily hardware-dependent, as a result of which the process of infrastructure upgrade to keep up with future demand is cumbersome and expensive.
Software-defined networks (SDN) hold the promise to decrease network rigidity by providing central control and flow abstraction, which in current network setups are hardware-based. The embrace of SDN in traditional cellular networks has led to the implementation of vital network functions in the form of software that are deployed in virtualized environments. This approach to move crucial and hardware intensive network functions to virtual environments is collectively referred to as network function virtualization (NFV). Our work evaluates the cost reduction and energy savings that can be achieved by the application of SDN and NFV technologies in cellular networks.
In this thesis, we implement a virtualized eNodeB component (Radio Resource Management) to add agility to the network setup and improve performance, which we compare with a traditional resource manager. When combined with dynamic network resource allocation techniques proposed in Elastic Handoff, our hardware agnostic approach can achieve a greater reduction in capital and operational expenses through optimal use of network resources and efficient energy utilization.
Advisor: Jitender S. Deogu
- âŚ