c with different priorities. Normally Rel99 and HSPA traffic have rather different QoS requirements: Rel99 mainly carries delay sensitive traffic like voice or streaming services; whereas HSPA traffic is primarily interactive and background traffic which is insensitive to the delay, therefore applying traffic separation technique to separate the HSPA and RE199 traffic over different paths with different priorities in the UTRAN transport network enables QoS differentiations for HSPA and Rel99 traffic while at the same time aims to achieve a maximum utilization of the transport bandwidth. Typically, Rel99 traffic is transported with ATM CBR (Constant Bit Rate) service category. It is defined as highest priority traffic class, where bandwidth is reserved up to requested Peak Cell Rate (PCR) with guaranteed cell loss ratio and cell transfer delay. This also implies high transport costs. While the transport of HSDPA and HSUPA traffic uses ATM traffic class UBR (Unspecified Bit Rate) or UBR+. UBR is a best effort service and is the lowest class of service in ATM. It is defined as low priority traffic class, which utilizes all bandwidth unused by the high priority traffic. Therefore it does not provide any guarantees for bandwidth, cell loss ratio and cell transfer delay. This traffic class has much lower transport costs. UBR+ is similar to UBR, but bandwidth is guaranteed up to a minimum rate MDCR (Minimum Desired Cell Rate). With UBR+, the HSPA traffic can be guaranteed up to MDCR. The detailed introduction of the basic concept of traffic separation and different possible traffic separation configurations for transmitting Rel99, HSDPA and HSUPA traffic in the same radio access network is given in Appendix A.1 (II) and (III). The impact of applying traffic separation is analyzed in Appendix A.16 (IV). The presented results show that using traffic separation technique greatly improves the end user performance as well as the transport network performance, which in turn saves the bandwidth on the lub link for achieving th