Saturday, September 5, 2009


In UMTS/GSM networks the whole area covered by network coverage is divided into smaller parts. The smallest and base entity is cell that is area controlled by base station (BTS/Node B). One or more cells form UTRAN Registration Area. RNC controls URA. One or more URA forms Routing Area (RA). The area controlled by SGSN. One or more RA can be part of Location Area (LA). This is controlled by MSC/VLR.

Another concept is Service Area (SA). Service Area is a subset of Location Area. Several cells may be grouped into Service Area. This area used by RAN helps to find out UE location within LA.

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