A communication network, comprising: a visited network arranged to provide service to a roaming user for a session, the visited network comprising a proxy online charging system, OCS,; the proxy OCS arranged to transmit an online charging request message to a home OCS in a home network for the roaming user wherein the online charging request message requests charging information for the roaming user; and the proxy OCS further arranged to receive an online charging response message from the home OCS that includes the charging information for the roaming user; characterized by: the communication network is a communication network having the Evolved Packet Core, EPC, core side of the Evolved Packet System, EPS, architecture defined in the Long Term Evolution, LTE, project; the proxy OCS further arranged to process the charging information to perform credit control for at least one network element in the visited network that is serving the sessions and to identify an allotment of service units granted by the home OCS for services provided to the roaming user in the visited network; the proxy OCS is further arranged to determine a rating for the session; and the proxy OCS is further arranged to grant a quota of service units to the at least one network element in the visited network based on the allotment of service units and the rating. a visited network arranged to provide service to a roaming user for a session, the visited network comprising a proxy online charging system, OCS,; the proxy OCS arranged to transmit an online charging request message to a home OCS in a home network for the roaming user wherein the online charging request message requests charging information for the roaming user; and the proxy OCS further arranged to receive an online charging response message from the home OCS that includes the charging information for the roaming user; characterized by: the communication network is a communication network having the Evolved Packet Core, EPC, core side of the Evolved Packet System, EPS, architecture defined in the Long Term Evolution, LTE, project; the proxy OCS further arranged to process the charging information to perform credit control for at least one network element in the visited network that is serving the sessions and to identify an allotment of service units granted by the home OCS for services provided to the roaming user in the visited network; the proxy OCS is further arranged to determine a rating for the session; and the proxy OCS is further arranged to grant a quota of service units to the at least one network element in the visited network based on the allotment of service units and the rating. the communication network is a communication network having the Evolved Packet Core, EPC, core side of the Evolved Packet System, EPS, architecture defined in the Long Term Evolution, LTE, project; the proxy OCS further arranged to process the charging information to perform credit control for at least one network element in the visited network that is serving the sessions and to identify an allotment of service units granted by the home OCS for services provided to the roaming user in the visited network; the proxy OCS is further arranged to determine a rating for the session; and the proxy OCS is further arranged to grant a quota of service units to the at least one network element in the visited network based on the allotment of service units and the rating.