Mobile communication system and method for establishing a data call

A method for establishing a data call in a mobile communication system, comprising:

• determining for a mobile subscriber at least one data call bearer service covering several user data rates;
• carrying out, upon establishing the data call between a mobile communication network and a mobile station, a user data rate negotiation for setting the user data rate to be used in the data transfer between the mobile station and the mobile communication network;
• allocating radio channel resources for the data call according to the user data rate negotiated;
• continuing call set up to a second party of the data call;
• determining the user rate of the second party in the data call;
• and
• adapting radio channel resources allocated on the basis of said negotiated user data rate at the beginning of the call set-up, according to the user rate of the second party, wherein said adapting of the radio channel configuration comprises at least one of the following:
• reducing the number of traffic channels allocated for the call;
• changing a channel coding;
• and
• changing a channel type.

A mobile communication system, comprising:

• at least one data call bearer service which covers several user data rates and which is determined for a mobile subscriber at a subscriber database of a mobile communication network;
• a negotiation procedure between a mobile station and a mobile communication network, for negotiating during call set-up, a user data rate used in the data call for data transfer between the mobile station and the mobile communication network;
• call control for allocating radio channel resources according to said negotiated user data rate;
• a mechanism configured to define the user rate of a second party in the data call;
• and
• the call control being arranged, in response to the second party having a lower user rate than said negotiated user rate, to alter the user rate negotiated between the mobile station and the mobile communication network to match the user rate of the second party.

A method for establishing a data call in a mobile communication system, comprising:

• defining, for a mobile subscriber, at least one of the following data call bearer services, each covering several user rates:
• an asynchronous bearer service, a synchronous bearer service, a PAD access bearer service, or a packet access bearer service;
• carrying out, upon establishing the data call between the mobile communication network and the mobile station, a user data rate negotiation for setting the user data rate to be used in the data transfer between the mobile station and the mobile communication network;
• allocating radio channel resources for the data call according to the user data rate negotiated;
• continuing call set up to the second party of the data call;
• determining the user data rate of the second party in the data call;
• and adapting radio channel resources allocated on the basis of said negotiated user rate at the beginning of the call set-up, according to the user rate of the second party.