Method for improving charging information accuracy in a telecommunications network with respect to a target user equipment , wherein the telecommunications network comprises a core network , a first base transceiver station and a second base transceiver station , wherein the target user equipment receives data traffic from the core network in the form of data packets, the data traffic being related to a data connection established between the target user equipment and the telecommunications network , wherein in case that the target user equipment camps on the telecommunications network using the first base transceiver station , the first base transceiver station comprises a first non-delivered packet data volume information , the first non-delivered packet data volume information counts the undelivered data packet volume from the first base transceiver station to the target user equipment , wherein in case that the target user equipment camps on the telecommunications network using the second base transceiver station , the second base transceiver station comprises a second non-delivered packet data volume information , the second non-delivered packet data volume information counts the undelivered data packet volume from the second base transceiver station to the target user equipment , wherein in case of a handover or cell change procedure from the first base transceiver station to the second base transceiver station regarding the target user equipment , the first non-delivered packet data volume information is transmitted from the first base transceiver station to the second base transceiver station and is taken into account for determining the second non-delivered packet data volume information , the first non-delivered packet data volume information being transmitted by means of using at least one out of the following: -- an X2 interface between the first base transceiver station and the second base transceiver station , wherein the first non-delivered packet data volume information is transmitted as part of a handover request message from the first base transceiver station to the second base transceiver station , -- an S1 interface between the first base transceiver station and the core network and the S1 interface between the core network and the second base transceiver station , -- a user equipment history information regarding the target user equipment , whereby the first non-delivered packet data volume information is transmitted to the second base transceiver station by adding the first non-delivered packet data volume information in the user equipment history information. -- an X2 interface between the first base transceiver station and the second base transceiver station , wherein the first non-delivered packet data volume information is transmitted as part of a handover request message from the first base transceiver station to the second base transceiver station , -- an S1 interface between the first base transceiver station and the core network and the S1 interface between the core network and the second base transceiver station , -- a user equipment history information regarding the target user equipment , whereby the first non-delivered packet data volume information is transmitted to the second base transceiver station by adding the first non-delivered packet data volume information in the user equipment history information. <EOS>