PCRF: On the blocking probability of LTE-A

Policy and charging rule function (PCRF) is a node in LTE-A network for provisioning of policy and charging resources to policy and charging enforcement function (PCEF) of PDN gateway (PGW). During policy allocation the PCRF allocates bandwidth to a call, depending on the total bandwidth available between PGW and the external packet data network. In this work, we analytically find the blocking probability of voice and video call from the policy provisioning perspective. Further we show that, if the available bandwidth between PGW and packet data network is not sufficient, it can create blocking of calls. Not only that, for a given value of arrival rate, we can find the optimal bandwidth between PGW and packet data network to decrease the blocking probability.