Efficient connection admission control based-code searching algorithm in 3G/mesh networks

Code allocation procedure in 3G mobile networks is provided by utilizing the OVSF channelization codes. In OVSF system, blocking of an incoming call (new or handover) can be characterized either as capacity blocking or as code blocking. Therefore, we propose an efficient CAC policy based on guard code scheme to reduce the failure rate of the handover (HO) calls due to code capacity shortage and at the same time CAC policy utilizes two code searching strategies (single code search (SCS) and multiple code search (MCS)) to mitigate the blocking due to code blocking. The adopted analysis of the proposed CAC is based on Markov chain model. The performance evaluation at code-level is measured in terms of code utilization, handover call failure rate and new call blocking probability.