Cellular system design using the expansion cell layout Method

Abstract
Cellular system design using the expansion layout method is described and the background and basis of the approach are covered. Key considerations in layout and cell selection emphasize portable coverage and smooth growth as the system matures. The concept is most useful in large systems but applies to any size which will experience additional cell needs as it grows. The approach is basically one that examines the evolution path of a system, including cell additions and subdvision and then constructs a physical cell layout for a future configuration instead of the first year. This is used as a framework to implement the system as required to meet capacity and distribution needs as actual growth is experienced. This results in the following main advantages: extra cell overlap in the early years for added reliability and backup for variable density response; improved in-building portable service from more extensive building penetration in the early years; flexibility in capacity adjustments for various years as individual cell requirements develop; a frequency plan which is a complete framework for all stages of system implementation. No retuning will be required. Other characteristics include: more cell sites in the early years than are needed simply for cellular geographic service area (CGSA) coverage but which will be needed later for capacity; some extra hardware may be involved in the early years, depending on trunking efficiency and user distribution; it may be necessary to introduce some sector transmit at an earlier stage in some cells than would be needed with the classical approach.

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