differentiate different traffic types with individual QoS requirements, typical scheduling strategies are prioritization where packets with higher priority are always sent before lower-priority packets (e.g. non- preemptive priority), or bandwidth fair sharing where certain shares of the link capacity are assigned to specific traffic flows or classes according to their configured priorities (e.g. WFQ). Different scheduling schemes determine different bandwidth allocations for different traffic types, and also results in different multiplexing gains that can be achieved, hence their influence on the dimensioning is significantly different. Several potential impacts of traffic control on network dimensioning are summarized as follows: (1) With packet scheduling, each traffic class is allocated to one fraction of the total bandwidth, and thus receives a corresponding QoS guarantee. Usually the worst case (i.e. the lowest priority traffic stream) is mostly considered for the bandwidth dimensioning. Moreover, the potential multiplexing gains of sharing the bandwidth resources needs to be taken into account as well. (2) Buffer management functions, such as buffer size, packet discarding, etc., have an impact on the achieved delay, delay jitter and packet losses, which are the relevant QoS measures for the dimensioning. 4.2 Important Issues for UMTS Network Dimensioning (3) Traffic shaping is a practical method for capacity assignment. It enables leasing bandwidth for transmitting UMTS traffic from fix network providers like ADSL or Ethernet to co-use the same physical links. 4.2.4 Resource Control Resource control is responsible for controlling the access to the available network resources at flow or connection level to reduce or avoid the possibility of service degradation from traffic overload. For instance, Connection Admission Control (CAC) (see section 3.3.4.3) is used to control the number of traffic flows or connections entering the network, where individual flows or connections make bandwidth reservations along