Abstract: A digital telecommunication facility has a base station and one or more cordless mobile units that communicate with the base station through a TDMA process. The mobile units and the base station change the transmitting/receiving frequency within which they communicate only once per TDMA frame and the retain the new transmitting/receiving frequency for a time corresponding to an entire TDMA frame.

Abstract: A digital telecommunications system has a base station and one or more wireless mobile parts. The mobile parts and the base station communicate according to the TDMA method. The frames of the TDMA method used in the telecommunications system have time slots of different lengths alternately succeeding one another within a TDMA frame.

Abstract: A communication system comprises a master station 21 and a plurality of slave stations 22-1 to 22-N each of which communicates with the master station through a radio channel carrying a communication signal by using time division multiple access. The slave stations are similar in structure to one another. The master station is similar in structure to each of slave stations. Each of the slave stations selectively transmits a speech signal and an image signal to the master station. On transmitting the speech signal, the speech signal is converted into an ADPCM signal. On transmitting the image signal, the image signal is converted into a PCM signal. The master station receives the communication signal which is transmitted from each of the slave stations. The master station detects whether or not the communication signal is representative of the ADPCM signal to selectively produce the speech signal and the image signal.

Abstract: A method and system for controlling admission to a packet switched radio channel (PRCH) is provided. A PRCH admission control function evaluates admission requests for users requesting admission to a PRCH. The admission requests each contain a priority value and an estimated data traffic for the requesting user. If the estimated data traffic from one or more packet calls currently using the PRCH and having a priority equal to or higher than the priority of the requesting user, plus the estimated data traffic required by the requesting packet call are less than a maximum tolerable traffic level, the packet call is granted admission.

Abstract: The frame timing control of TDMA signals in cellular systems is implemented in mobile stations and/or base stations according to the invention so that the functions are divided between the frame timing control unit (1) and the microcontroller (2). In this way, the frame timing can be controlled in a flexible manner, for instance when moving from one TDMA cell type to another, without breaking the speech or data communication.

Abstract: A method for improved data communications in a wireless system is described. An enhanced access burst is provided having an additional logical information field, or alternately using one of a set of possible synch sequences indicative of supplementary information. Upon receipt of a system parameter indicating an enhanced access burst capability, the communication unit sends an appropriate enhanced access burst with the increased information. A reduction in system messaging is thus achieved, e.g., by avoiding the need to send the supplemental information via subsequent bursts.

Abstract: In direct communications between PHS terminals, each terminal detects an intermittent timing signal from a predetermined control channel of the base station. Based on the intermittent timing signal, a terminal intermittently exchanges signaling information with another terminal through an idle channel to establish synchronization therebetween. A calling-party terminal searches for an idle channel and intermittently transmits a control signal to a called-party terminal through the idle channel with intermittently supplying power to a transmitter. A called-party terminal intermittently transmits a response signal to the calling-party terminal through the idle channel. When receiving the response signal from the called-party terminal, synchronization of the calling-party terminal with the called-party terminal is established.