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The invention relates to a method of controlling packet transmission in conjunction with a packet radio service in a radio system comprising a base station and a number of subscriber terminals transmitting data to the base station in packet form using the same transmission channel, in said method th

The invention relates to a method of controlling packet transmission in conjunction with a packet radio service in a radio system comprising a base station and a number of subscriber terminals transmitting data to the base station in packet form using the same transmission channel, in said method the base station transmitting packet to the terminals, and said packets comprising data indicating to which terminal each packet is intended, actual data, and control data controlling the transmission of the terminals on the transmission channel. To enable the radio path resources to be used efficiently, when there is no actual data, the base station transmits packets comprising the control data of the transmission but no actual data to the terminals.

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1. A method of controlling packet transmission in conjunction with a packet radio service in a cellular radio system, the method comprising: transmitting data to a base station in packet form using a common transmission channel from a number of subscriber terminals, the transmission channel suppo

1. A method of controlling packet transmission in conjunction with a packet radio service in a cellular radio system, the method comprising: transmitting data to a base station in packet form using a common transmission channel from a number of subscriber terminals, the transmission channel supporting packet transmission in different directions on different carrier frequencies; transmitting packets to the terminals from the base station via the transmission channel, the transmission channel utilizing a frame structure comprising time slots, every time slot of a frame can be used in transmitting packet data to the terminals, the packets comprising: a field reserved for data that indicates for which terminal the packets are intended; a field reserved for control data that controls transmission on the transmission channel; and a field reserved for actual data when there is actual data to be transmitted, but when there is no actual data to be transmitted in the field reserved for actual data, the base station transmits packets comprising: control data in the field reserved for transmission control data; predetermined data in the field reserved for data that indicates for which terminal the packets are intended, the predetermined data indicates that the packets being transmitted are not intended for any of the terminals; and no actual data is transmitted in the field reserved for actual data. 2. The method of claim 1, further comprising transmitting packets using every time slot of each frame. 3. The method of claim 1, further comprising transmitting packets using at least one time slot of each frame. 4. A method of controlling packet transmission in conjunction with a packet radio service in a cellular radio system, the method comprising: transmitting data to a base station in packet form using a common transmission channel from a number of subscriber terminals; and transmitting packets to the terminals from the base station; the packets comprising: a field reserved for data that indicates for which terminal the packets are intended; a field reserved for control data that controls transmission on the transmission channel; and a field reserved for actual data when there is actual data to be transmitted; but when there is no actual data to be transmitted in the field reserved for actual data, the base station transmits packets comprising: control data in the field reserved for transmission control data; predetermined data in the field reserved for data that indicates for which terminal the packets are intended, the predetermined data indicates that the packets being transmitted are not intended for any of the terminals; and no actual data is transmitted in the field reserved for actual data. 5. The method of claim 4, further comprising transmitting data indicating that the packets contain no actual data. 6. The method of claim 4, wherein the packets being similar in structure to conventional data packets, and that an arbitrary bit sequence is transmitted in the field reserved for actual data. 7. The method of claim 4, wherein the packets being similar in structure to conventional data packets, and that a predetermined bit sequence is transmitted in the field reserved for actual data. 8. The method of claim 4, wherein the packet radio service is a General Packet Radio Service. 9. The method of claim 4, further comprising: transmitting packets to the terminals from the base station via the transmission channel utilizing a frame structure comprising time slots; transmitting packet data in every time slot of a frame; and transmitting packets using every time slot of every frame. 10. The method of claim 4, further comprising: transmitting packets to the terminals from the base station via the transmission channel utilizing a frame structure comprising time slots, transmitting packet data in every time slot of a frame; and transmitting packets using at least one time slot of each frame.