Abstract
In order to handle the huge amounts of data transmitted through hot spots and to increase cell coverage in buildings, this paper proposes a sectored cellular network with small cells (SCNSC) embedded in each sector. Two region types, sectors and variable-radius small cells are classified in an SCNSC macro cell. Because the system capacity is enhanced by using fractional frequency reuse (FFR), the overall channel bandwidth is divided into two or three frequency bands depending on whether the number of sectors in a macro cell is even or odd. For the purpose of topological evaluation on the proposed SCNSC, we build an analytical model using Markov chain theory. The performance measures include new-call blocking and handoff-call dropping probabilities, average waiting times, and normalized throughputs in each sector and its embedded small cell by varying mobile stations’ moving speeds, the number of sectors, and the radius size of an embedded small cell. From the evaluation results, it is demonstrated that adjusting either the number of sectors or the coverage of an embedded cell can satisfy different service demands.
Highlights
Advancements in mobile wireless communication technology have led to a tremendous growth in the number of wireless devices and the volume of data transmitted, respectively
Fixing the radius of a small cell (r) at a medium size, 150 meters, Figures 5-9 show the performance measures derived in Section 3.3 versus different traffic loads
We have presented a sectored cellular network with small cells (SCNSC) architecture
Summary
Advancements in mobile wireless communication technology have led to a tremendous growth in the number of wireless devices and the volume of data transmitted, respectively. 3) A macro cell using a multi-directional antenna consists of multiple sectors and one or more small cells are installed in each sector [22]-[27]. Dividing a macro cell into a center zone and an edge zone (the cell coverage beyond the center zone) of three sectors, the authors in [26] aimed to mitigate interference between a macro cell and multiple femtocells in the center and edge zones by using fractional frequency reuse (FFR) under the macro cell allocating a frequency band and the femtocells selecting the. We derive the new-call blocking and handoff-call dropping probabilities, average waiting times, and normalized throughputs in each sector and its embedded small cell in terms of the call generation rate, MS moving speed, the number of sectors, and the radius size of a small cell using Markov chain theory.
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