Access probability aware cell reselection for load balancing

In LTE, AC barring check is performed by UEs before initiating an RRC connection. In some cells with a low access probability, the UEs may have to keep retrying access in the serving cell which results in higher connection failure and longer access delay. We therefore propose balancing the UEs by adjusting the cell reselection criteria based on the access probability in the serving cell and neighboring cells, so that the UEs in a serving cell with a lower access probability shall be more encouraged to reselect a cell with a higher access probability. The proposed methods are analyzed in a simplified model and further validated using computer simulation. They both show the significant advantage over existing criteria in LTE.