Radio Resource Management for Handoff Provisioning in WCDMA Systems

In this paper we propose an effective combination of a call admission control (CAC) mechanism together with a traffic scheduling algorithm. These two schemes are designed for WCDMA systems and operate in a complementary fashion in order to support handoff provisioning. The CAC mechanism belongs to the well known family of guard channel schemes and reserves some code capacity to favor the continuation of handover (HO) calls over the new calls. During the handoff procedure the HO calls experience high delays as a number of packets have to be forwarded through the wireline infrastructure to the target cell. Thus, we employ a delay driven traffic scheduler (DDS) which aims to prioritize calls which experience high delays such as HO calls. Furthermore, DDS is able to exploit information from the physical layer in order to avoid erroneous packets transmissions and increases system performance. The simulation results, demonstrate the effectiveness of our proposed scheme.