ISSN : 1796-2056
Volume : 1    Issue : 3    Date : July 2006

UMTS Capacity and Throughput Maximization for Different Spreading Factors
Robert Akl and Son Nguyen
Page(s): 40-49
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An analytical model for calculating capacity in multi-cell UMTS networks is presented. Capacity is
maximized for different spreading factors and for perfect and imperfect power control. We also
design and implement a local call admission control (CAC) algorithm which allows for the
simulation of network throughput for different spreading factors and various mobility scenarios. The
design of the CAC algorithm uses global information; it incorporates the call arrival rates and the
user mobilities across the network and guarantees the users’ quality of service as well as pre-
specified blocking probabilities. On the other hand, its implementation in each cell uses local
information; it only requires the number of calls currently active in that cell. The capacity and network
throughput were determined for signal-to-interference threshold from 5 dB to 10 dB and spreading
factor values of 256, 64, 16, and 4.

Index Terms
WCDMA, Call Admission Control, Mobility, Network Throughput, Optimization.