This paper describes a Call Admission Control (CAC) mechanism that adapts the type of admitted users based on a proposed resource allocation strategy that responds to changes in the channel conditions. The admission control decides to admit new services according to the load of the cell and based on a-priori analysis of the radio link for the incoming request in terms of QoS satisfaction. For low to medium values of the load the Resource Allocation (RA) grants resources to user with higher priority. The priority is defined based on user and service characteristics. For very high load values the mechanism will aim at maximising the number of users that receive a connection even the QoS for high priority users must be degraded.