Method and devices for specifying the quality of service in a transmission of data packets

A method of specifying a quality of service in transmission of a data packet through a move network between a service entity (AF1) and a user's unit is indicated. A move network contains a core network node (SGSN1) and an access node (NB1, RNC1) which were constituted so that processing of a data packet to which between a service entity (AF1) and user's units (UE1) is sent might be controlled. A plurality of service classes about a quality of service are set up a priori, and the very best service class for transmission is chosen from the plurality. The 1st transmission context (PDP1) is set up between a core network node and a user's unit (UE1), and the 1st transmission context is related with the 1st attribute set that specifies the 1st quality of service for exchange of a data packet with a user's unit in the transmission. The 2nd transmission context (RAB1, RB1) is set up between an access node (NB1, RNC1) and a user's unit (UE1), and it is the 2nd transmission context, It is related with the 2nd attribute set for specifying the 2nd quality of service for exchange of a data packet with a user's unit in the transmission. The very best service class determines the 1st attribute set with the 1st unique mapping function performed in a core network node, and is the very best service class, The 2nd unique mapping function performed in an access node determines the 2nd attribute set. A corresponding move network and a control device, and a computer program are also described.