Call admission control between heterogeneous networks,such as an integrated 3GPP LTE and WLAN network, plays an important role to utilize the system resources in a more efficient way. In this paper, we propose that the preference to the WLAN is determined based on the traffic load in the WLAN and the location of the cellular users. Our analysis relies on previous work that divides the 3G cellular coverage area into zones based on the amount of resources that are required to support a connection to a mobile user. Using this model, we derive new call blocking and handoff failure probabilities as well as new call and handoff attempt failure probabilities. Through simulations, we investigate proper preference setttings by changing the WLAN load in a 3 ring-based sector cell with a WLAN hotspot.
Citation: IEEE Transactions on Wireless Communications
Pub Type: Journals
CAC, Vertical handoffs, Heterogeneous networks, Ring-based model