Method in a communication system, a communication system and a communication device

A communication system comprising a sending communication device, a receiving communication device, and a communication network to transmit multimedia streams from the sending communication device to the receiving communication device at least partly via a wireless communication network, wherein the communication system comprises:

• a detector to define at least one of the following parameters of the transmission of the multimedia stream:
• the maximum bit rate required by the transmission of the multimedia stream,
• the maximum service data unit size, and
• a transmitter to send at least said parameter to the receiving communication device for reservation of network resources.

A communication system comprising a first wireless communication device and a second wireless communication device, a wireless communication network to transmit streams of a conversational multimedia application between said first and second wireless communication devices, bearer services for the transmission of the multimedia streams in said wireless communication network, the first wireless communication device comprising a transmitter to transmit information about selected resources to said second wireless communication device, wherein the first wireless communication device further comprises:

• a detector to define at least one of the following parameters of the transmission of the multimedia stream:
• the maximum bit rate required by the transmission of the multimedia stream,
• the maximum service data unit size, and
• transmitter to send at least said parameter to the second wireless communication device for reservation of network resources.

A sending communication device to be used in a communication system to transmit multimedia streams from the sending communication device to a receiving communication device at least partly via a wireless communication network, and in which system information about the multimedia stream is described with a session description protocol, wherein the sending communication device comprises:

• a detector to define at least one of the following parameters of the transmission of the multimedia stream:
• the maximum bit rate required by the transmission of the multimedia stream,
• the maximum service data unit size,
• a message composer to set an attribute field of the session description protocol to the value of the defined parameter, and
• a transmitter to send at least said attribute field to the receiving communication device for reservation of network resources.

A receiving communication device to be used in a communication system to receive multimedia streams transmitted from a sending communication device at least partly via a wireless communication network, wherein the receiving communication device comprises:

• a selector to select a multimedia stream to be transmitted from the sending communication device to the receiving communication device.
• a transmitter to send information on the selection to the sending communication device and to request information on at least one of the following parameters of the transmission of the multimedia stream:
• the maximum bit rate required by the transmission of the multimedia stream,
• the maximum service data unit size, and
• a transmitter to send a request for reservation of network resources for receiving the selected multimedia stream.

A wireless communication device to be used in a communication system comprising a wireless communication network to transmit streams of conversational multimedia application between said wireless communication device and another wireless communication device, bearer services for the transmission of the multimedia streams in said wireless communication network, the wireless communication device comprising a transmitter to transmit information about selected resources to said another wireless communication device, wherein the wireless communication device further comprises:

• a detector to define at least one of the following parameters of the transmission of the multimedia stream:
• the maximum bit rate required by the transmission of the multimedia stream,
• the maximum service data unit size, and
• transmitter to send at least said parameter to said another wireless communication device for reservation of network resources.