Dynamic simulator for studying WCDMA based hierarchical cell structures

Ghorashi, Seyed Ali; Homayounvala, Elaheh; Said, F.; Aghvami, A.H.

doi:10.1109/pimrc.2001.965487

Cited by 20 publications

(6 citation statements)

References 8 publications

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“…A full motion or dynamic system level simulator for the downlink, based on the UMTS air interface specifications [24], has been developed to verify the results of this study [25]. The simulator with a time-driven simulation engine in it, recalculates mobile positions, path-losses, mobile station cell ownerships and generates call originating/clearing events and determine the E b /I o , at regular time intervals.…”

Section: System Level Simulatormentioning

confidence: 99%

Opportunistic scheduling using cognitive radio

Döhler

Ghorashi

Ghozzi

et al. 2006

Comptes Rendus. Physique

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Traditional cognitive approaches based on interference scanning discard a certain communication band once interference is detected, irrespective of the temporal characteristics of the interference. The aim of this article is to alert the community that interference exhibits temporal fluctuations, which can be exploited by a cognitive radio in an opportunistic manner. To this end, we present some mathematical approaches that describe the temporal behaviour of interference signals obeying a lognormal shadowing distribution. We derive some key quantities, such as throughput, for an example hierarchical cell structure configuration of a microcell hotspot being operated within a macrocell using the same frequency band. To cite this article: M.

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Section: System Level Simulatormentioning

confidence: 99%

Opportunistic scheduling using cognitive radio

Döhler

Ghorashi

Ghozzi

et al. 2006

Comptes Rendus. Physique

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“…Accurate system level simulations are required for the assessment of the network performance under different conditions. Some previous studies related to load control and system level simulators can be found in [1], [2], [3], [4], [5], [7].…”

Section: Introductionmentioning

confidence: 99%

Dynamic UMTS Simulator for Congestion Studies and Evaluation of Resource Management Techniques

Nousiainen¹,

Kordybach²,

Kemppi³

et al. 2003

Mobile and Wireless Communications

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Abstract:A dynamic UMTS system level simulator has been designed and implemented in Windows NT/2000 environment using Visual C++. The objective has been to design and implement such a simulator that can be used to create and study different traffic load scenarios and resource management techniques for tackling congestion situations.An UMTS system level simulator that is comprehensive and flexible and takes into consideration 3GPP recommendations is presented in this paper. It contains very detailed models of many important UMTS features. Simulator features designed for creating different load situations in the network are described. Furthermore, a congestion/admission control framework for UMTS is presented. Finally, simulation results illustrating the congestion causation features and congestion detection are shown.

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“…A dynamic system level simulator [6] for the downlink that is based on the UMTS air interface specifications [7] has been developed. Seven cells, including the given cell in the center and six adjacent cells in the first tier are simulated, with a wrap around effect to keep the density of the users fixed.…”

Section: Simulation and Resultsmentioning

confidence: 99%

Non-real time packet transmission for a microcell (hotspot) embedded in CDMA macrocell systems

Ghorashi

Wang

Said

et al.

IEEE International Conference on Communications, 2003. ICC '03.

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In a macrocell network, there will remain some geographical areas within the cell coverage where mobile stations require further services. These are mainly in terms of downloading data, in particular in temporary or permanent hotspot areas, such as exhibitions, conference centers, etc. The objective of this study is to obtain extra capacity for W-CDMA systems by adding hotspot base stations to an already present continuous macrocell layer. IP-based services are offered to local mobile stations, using packet switched transmission without additional bandwidth; i.e. using the same frequency band in both the hotspot and macrocell. In order to maximize the hotspot base station throughput, and at the same time, to minimize the interlayer interference from hotspot to macrocell, a new Link Quality Control scheme is designed. Downlink system level simulations are also carried out to prove the feasibility of the idea and to show the effect of required E b /(I o +N o ) for macrocell users, on the hotspot data throughput.Keywords-Code division multiple access (CDMA); hierarchical cell structures (HCS); link quality control (LQC); packet transmission.

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Dynamic simulator for studying WCDMA based hierarchical cell structures

Cited by 20 publications

References 8 publications

Opportunistic scheduling using cognitive radio

Opportunistic scheduling using cognitive radio

Dynamic UMTS Simulator for Congestion Studies and Evaluation of Resource Management Techniques

Non-real time packet transmission for a microcell (hotspot) embedded in CDMA macrocell systems

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