Patent ID: 6577619
Filing Date: 2003-06-10
Classification: H04L,H04Q,H04W

Abstract:
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.