Date Added: Jan 2011
Heterogeneous networks are the next generation of wireless networks. They are envisioned to offer high data rates and multimedia services. Additionally, they are intended to offer services to users regardless of the access technology. Provision of multimedia services to users will result in high demand for radio resources, which are scarce. It is therefore important to manage radio resources effectively so as to meet users' QoS requirements. Call admission control has been used in heterogeneous networks to ensure efficient utilisation by determining how resources are allocated. However variation in users' demand for services with time and across individual networks can cause traffic imbalance and poor QoS in heterogeneous wireless networks.