1. Split protocol transmission method for transmitting data and a communication thread identifier for said data along a communication path from a source functional unit (SFU) to a destination functional unit (DFU), wherein in the communication path a data consuming functional unit (CFU) and a data producing functional unit (PFU) directly communicate to each other by means of a handshake procedure wherein the data consuming functional unit (CFU) indicates a communication thread identifier (TID) to the data producing functional unit and the data producing functional unit provides data related to said communication thread identifier to said data consuming functional unit.