Allocating data transmission resources in packet-switched data transmission

A packet-switched telecommunications system including:

• a terminal, and
• a fixed network which comprises an operational entity for defining resources for a radio bearer, in which system
• a compression method of header fields in data packets used on the radio bearer is configured to be defined, said compression method requiring a bi-directional connection, and after the compression method being defined
• the resources of the radio bearer are configured to be defined on the basis of an application used by the terminal on said radio bearer in such a manner that said resources also comprise the capacity required by the defined compression method of header fields in data packets.

An apparatus comprising:

• an operational entity for defining resources for a radio bearer in a packet-switched telecommunications system, the apparatus being arranged to:
• define a compression method of header fields in data packets used on the radio bearer, said compression method requiring a bi-directional connection;
• define resources of the radio bearer, after the compression method being defined, on a basis of an application used by a terminal on the radio bearer;
• and
• control a definition of the radio bearer resources in accordance with a capacity required by the defined compression method of header fields in data packets.

An apparatus comprising:

• at least one application capable of requesting radio bearer resources from a network of the packet-switched telecommunications system, the apparatus being arranged to:
• transmit information on compression methods of header fields in data packets supported by the apparatus to the network;
• and
• execute data transmission of the at least one application in accordance with a configuration of radio bearer resources defined by the network, wherein a definition of the radio bearer resources is controlled in accordance with a capacity required by a selected header compression method, said header compression method requiring a bi-directional connection.