WCDMA Downlink Capacity of Cigar-Shaped Microcells Using Soft Hand ...
Posted by ~Ray @ 2007-12-15 14:16:55
This paper presents a class-based downlink capacity estimation technique with several modifications to the general CBQ (Class-Based Queuing) principles to ensure its applicability in a mobile environment. Instead of the fixed bandwidth used in wired links a simple analytical expression for the maximum available resource of a communicate downlink is derived in the paper. The resource-sharing factor for each class is then defined as the total resource allocation for that class divided by the maximum available resource. Analytical result shows that the class-based downlink throughput can be expressed as the weighted sum of the resource-sharing factors of all classes. CBQ-based downlink capacity dimensioning including estimations on the average be of connections for different classes and calculations for the estimated downlink throughput in times of congestion is presented using the analytical copy derived in this chew over. A simulative evaluation is provided to show the accuracy of the analytical model. When the downlink becomes congested the simulative throughput is approaching to the estimated result and is restricted by this determine. A simple CBQ-based call admission control (CAC) algorithm is developed in our simulation model.
In this cover the downlink sector capacity of a cigar-shaped microcells using wideband code-division multiple-access (WCDMA) with soft hand-over (SHO) mode is analyzed. The two-slope propagation loss with log-normal shadowing is used in the analysis where a model of eight cigar-shaped microcells is utilized to reason the downlink sector capacity. The performance of the downlink is studied for different sector radii standard deviations of the shadowing and propagation exponents. It is found that for a sector be higher than 940 m increasing the sector range ordain decrease the downlink sector capacity. Also it is open that increasing the value of the propagation parameters will reduce the downlink sector capacity. In many cases the downlink sector capacity will be label limited since the theoretical downlink sector capacity is higher than the number of codes assigned to each sector. The high theoretical downlink sector capacity is due to the low value (0.06–0.1) of the WCDMA orthogonality factor of rural govern microcells.
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