Abstract
CDMA (code division multiple access) is a promising air interface technique for digital cellular systems. The soft handoff between base stations is one of many important features of CDMA for the mobile station crossing the cell boundaries. When a mobile station during a call moves to an adjacent MSC (mobile switching center) service area, we propose that the traffic data from the new base station be carried to the old MSC through the link between MSCs. The old MSC receives multiple traffic data from the base stations that are serving the mobile station requesting the inter-MSC soft handoff. We develop an analytical approach for calculating the traffic load on the link by the soft handoffs between MSCs. The service area of an MSC is defined as the union of the service areas of the base stations and is assumed to have a hexagonal shape. The blocking probability of the soft handoff between MSCs due to the shortage of the link capacity is derived by the Erlang loss formula.
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