Method and communication system for selecting a transmission mode for transmitting payload data

A method for selecting a transmission mode for transmitting payload data between a first communication device and a second communication device over a packet-oriented communication network, wherein a quality-of-service of the transmission is dependent on the respective transmission mode, the method comprising:

• transmitting a first list of transmission modes and a second list of transmission modes to a quality-of-service device that is not either of the first and second communication devices, the first list of transmission modes supported by the first communication device, and the second list of transmission modes supported by the second communication device, the second list generated independently of the first list;
• selecting at least one transmission mode from the first and second lists by the quality-of-service device based on available transmission resources of the communication network such that the quality of service dependent on the selected at least one transmission mode is guaranteed by the available transmission resources;
• transmitting the selected at least one transmission mode from the quality-of-service device to a data link control, the data link control not being one of the first and second communication devices, not being a component of either of the first and second communication devices, not being a component of the quality-of-service device, and not being the quality-of-service device;
• initiating a further selection of a transmission mode by the data link control, the further selection based on the selected at least one transmission mode transmitted to the data link control;
• and
• transmitting the payload data between the first and second communication devices using the transmission mode selected in the further selection.

A communication system for selecting a transmission mode for transmitting payload data between a first communication device and a second communication device over a packet-oriented communication network, wherein a quality of service of the transmission of payload data is dependent on the transmission mode to be used for transmitting the payload data, the system comprising:

• a quality-of-service device for:
• receiving a first list of transmission modes supported by the first communication device, receiving a second list of transmission modes supported by the second communication device, the second list generated independently of the first list, selecting one or more transmission modes from the first and second lists on the basis of available transmission resources of the communication network such that the quality of service dependent on the selected one or more transmission modes is guaranteed by available transmission resources, and transmitting the selected one or more transmission modes to a data link control, the quality-of-service device not being either of the first and second communication devices and not being a component of either of the first and second communication devices;
• and
• the data link control for initiating a further selection of a transmission mode from the one or more transmission modes for the first and second communication devices selected by and transmitted by the quality-of-service device, the data link control not being one of the first and second communication devices, not being a component of either of the first and second communication devices, not being a component of the quality-of-service device, and not being the quality-of-service device;
• and
• a transmission device for transmitting the payload data between the first and second communication devices using the transmission mode selected via the further selection.