Abstract: In a receiver for signals set in time slots within fixed length time frames, noise is supplied as an input signal and the received signal value is stored with measured temperature values. Temperature corrections for temperature are determined and stored to be applied subsequently.

Abstract: In a communications between a base station and subscriber unit in time slots within fixed length time frames, different types of messages require different numbers of timeslots per frame to maintain transmission rate. At least a portion of the message is detected to determine the type of message, and if appropriate, additional time slot(s) are assigned.

Abstract: In transmission between a base station and a subscriber unit, system control signals are sent in time slots within fixed length time frames. The system control signals are fragmented, each fragment being sent in a different time slot of a frame.

Abstract: The present invention relates to a method of transmitting digital data messages in predetermined time slots within fixed length time frames from at least one of a plurality of subscriber units to a base station for reception, in which, selectively, subscriber units which are members of one or more predetermined classes of subscriber units are restricted from transmitting at least one predetermined type of message. This advantageously helps in avoiding overload of the network. The invention also relates to corresponding communication means.

Abstract: A cellular telecommunications network includes spaced apart base stations. Each base station has three directional antennas for transmission and reception of signals to subscriber units. Eight frequency groups are assigned among all the antennas such that each frequency group is reused on average at three out of every eight base stations.

Abstract: In a communications network involving transmission of data packets, control messages between nodes are assigned priorities dependent on message type. The allocated of messages to TDM/TDMA time slots is dependent on the assignment priorities.

Abstract: In adaptive digital filtering, first steps of adapting a filter coefficient dependent on a received data sample, and second steps of filtering by applying an adapted filter coefficient to a received data sample, are alternated so that adapted filter coefficients and modulated data samples are alternatively determined. In consequence, each adapted filter coefficient can be provided for immediate use in filtering.

Abstract: In time domain multiplex/time domain multiple access communications between a base station and subscriber unit, the base station sends a timing reference signal. A subscriber unit responds with a data packet (a) sufficiently short to ensure correct reception by the base irrespective of transmission time. The base determines the transmission time taken and instructs the subscriber unit to advance its timings so that longer data packets (b) can be sent so as to be received when expected. The timing adjustment includes both a fixed present component dependent on approximate separation of base station and subscriber unit, and a second component from measurement of the transmission time taken.