Cellular Systems Cellular Concepts The cellular concept was a ...

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EE5401 Cellular Mobile Communications EE5401 Cellular Mobile Communications • If we partition a cell into three 120° sectors, the number of co-channel cells are reduced from 6 to 2 in the first tier. • Using six sectors of 60°, we have only one co-channel cell in the first tier. • Each sector is limited to only using 1/3 or 1/6 of the available channels. We therefore have a decrease in trunking efficiency and an increase in the number of required antennas. • But how can the increase in system capacity be achieved? Institute for Infocomm Research 77 National University of Singapore Institute for Infocomm Research 78 National University of Singapore
EE5401 Cellular Mobile Communications EE5401 Cellular Mobile Communications Micro cells • Micro cells can be introduced to alleviate capacity problems caused by “hotspots”. • By clever channel assignment, the reuse factor is unchanged. As for cell splitting, there will occur interference problems when macro and micro cells must co-exist. Institute for Infocomm Research 79 National University of Singapore Institute for Infocomm Research 80 National University of Singapore
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Cellular Systems Cellular Concepts The cellular concept was a ...

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