The Impact of Indoor Traffic on the Performance of WCDMA High Speed Downlink Packet Access Within Macro Cells
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Helsinki University of Technology |
Diplomityö
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Date
2006
Department
Major/Subject
Tietoliikennetekniikka
Mcode
S-72
Degree programme
Language
en
Pages
xi + 65
Series
Abstract
Signals travelling between outdoor base stations and mobile phone users located inside buildings are exposed to a building penetration loss. This thesis studies the consequences of the building penetration loss and the impact of indoor users on the network performance. The simulated network is a pure High Speed Downlink Packet Access (HSDPA) network, i.e. a network with no other traffic on the dedicated channels, deployed in a macro cellular network layout. The aim of the thesis is to study the network performance as a function of the fraction of indoor users. The network is simulated with a Matlab based simulation tool. An appropriate propagation model is, together with a building penetration model, taken into consideration within the simulations and the HSDPA performance is presented in terms of user bit rates and cell throughput. The network performance is evaluated for different amount of traffic, different amount of users located inside buildings and for different cell sizes. The results of the simulations point out how the network performance depends on the amount of traffic and on the distribution of the users. The main reasons for the changes in network performance is lack of available power for the high speed channels, attenuation of the high speed channels due to the building penetration and increased transmission delay due to degraded bit rates resulting in queues to be built up. Further, an indoor margin that can be taken into account when deciding the maximum cell size, is also suggested. Considering the significance of the results, the simulations could be done with more accurate propagation models and for different building types in order to give more general results. But, the results presented in this thesis are however assumed to give a fair overall estimate of the HSDPA network performance.Description
Supervisor
Häggman, Sven-GustavThesis advisor
Hiltunen, KimmoKeywords
3G, inomhustäckning, UMTS, radiovågsutbredning, HSDPA, indoor coverage, radio wave propagation