Patent ID: 7649858

Claim:
A method comprising: segmenting data packets of a first data flow into radio blocks and transmitting the radio blocks in a radio channel from a transmitter to a receiver; in response to a required transmission of data packets of a second data flow, providing a first field and a second field, signaling in the first field a change in data flows, signaling in the second field an identity of the second data flow, and segmenting data packets of the second data flow into radio blocks and transmitting the radio blocks of the second data flow until there is no longer a need to send data packets of the second data flow, or until a change is required to a third data flow, wherein the first field, when not used to signal a change in the data flows, is used to provide a length of a segment that is completed within a radio block, wherein the first field is not provided in the radio block for the segment if that segment is not completed within the radio block, wherein the second field is provided in the radio block only when the first field indicates a change in data flows, wherein the first field is a length indicator field, wherein the second field is a flow identifier field, wherein the length indicator field has a value that does not correspond to an allowable segment length and that is inserted into the beginning portion of a radio block at a point that indicates where the change from the first data flow to the second data flow is to occur, wherein a further length indicator field is inserted after the length indicator field, the further length indicator field having a value to indicate the length of the packet or portion of a packet that is the first packet of the second data flow, and wherein the flow identifier field is inserted into the radio block just prior to the beginning of the first segment of the first packet of the second data flow.