If the location cell of a calling subscriber or a called subscriber belongs to a set of special cells at the beginning of a call, a cheaper tariff is applied. According to the invention, the charging criterion is updated in the beginning and during the call. If a subscriber roams from the area of a public...http://www.google.fr/patents/US6345181?utm_source=gb-gplus-shareBrevet US6345181 - Charging criteria for a call in a cellular mobile network
Charging criteria for a call in a cellular mobile network
