Abstract: There is provided a method of operating a base station, the method comprising determining whether there are any mobile devices that are not associated with the base station that require protection from interference caused by downlink transmissions of the base station; and setting a maximum permitted transmission power for the base station based on the result of the step of determining.

Abstract: A method for utilising resources of a CDMA telecommunications systems comprising a plurality of base stations and one or more mobile terminal is disclosed, which method comprises causing the base stations to indicate, to the one or more terminals, whether they have unused capacity and causing one or more of the mobile terminals to change or maintain constant its data rate dependent upon the unused capacity indication received from the base stations. A contention resolution phase may be used so that only sufficient terminals increase their data rate to accommodate the unused capacity.

Abstract: In a method for wireless data communication between a base station and a subscriber unit in a wireless communication system, groups of symbols of an input data stream are commutated to produce a plurality of commutated data streams. The plurality of commutated data streams are then transformed to produce a plurality of transformed data streams. Next, each transformed data stream is spread with a selected one of a plurality of spreading codes to produce a plurality of antenna signals. Finally, each of the plurality of antenna signals is transmitted using a selected one of a plurality of spaced apart antennas, wherein the plurality of spaced apart antennas are spaced apart to provide transmit diversity. In one embodiment, the transform is a space-time transform.

Abstract: In a wireless communication system, a chip time is selected in a complex pseudonoise (PN) sequence generator. For a next chip time following the selected chip time, a phase difference between a previous complex PN chip and a next complex PN chip is restricted to a preselected phase angle. In one embodiment, every other chip time is selected and the preselected angle is 90 degrees.

Abstract: An apparatus and method enabling a mobile station to transfer its communications between two dissimilar communications systems, for example, between a first communications system having a time continuous structure, such as a CDMA system, and an alternate communications system having a time discontinuous structure, such as a TDMA system. In one embodiment, the mobile station initiates a time-compressed mode of operation of the first system in which, for a portion of each frame, transmission is disabled, accesses the second system during the disabled periods and specifies to the first system frame structure information of the second system. The first system adjusts the time-compressed mode of operation so that communication with the mobile station occurs during `N` time slots of each frame, the widths and positions of each slot within each frame being set in order to avoid contention with communications to and from the second system.

Abstract: A transmitter for a communication system transmits consecutive chips of a signal shifted in phase +/-90 degrees +/- nan angle between 0 degrees and 45 degrees which is a function of a spreading gain.

Abstract: A radio communications device is arranged to communicate time divided signals (60 and 70) over first (40) and second (50) time discontinuous systems having first and second frame structures respectively. Switching device (120) switches between communicating signals (60) over the first system (40) during time periods of the first frame structure and communicating signals (70) over the second system (50) during time periods of the second frame structure. Hence over a given period of time the device simultaneously communicates time divided signals over the first (40) and second (50) systems.