Abstract: A method for automatically determining the baud rate of a serial data transmission comprises the steps of setting a receiving device to a first baud rate, processing (65) a first data word received by said receiving device and possibly further information to determine said baud rate of said data transmission, possibly setting (68) said receiving device to a second baud rate in order to enable said receiving device to find the beginning of a subsequent data word in said serial data transmission, and possibly setting (74) said receiving device to said determined baud rate. A corresponding apparatus and a mobile telephone each employs this method. The invention provides an autobauding function which causes little expense in terms of hardware and processing time, and which will correctly synchronize with the serial data transmission even if the transmitted data words immediately follow each other.

Abstract: A GSM transceiver for use in a GSM network is disclosed. The transceiver includes a multilayer protocol stack for executing a plurality of asynchronous tasks which are encoded with a universal and generic instruction set used for communicating between and synchronizing the tasks; a multitasking operating system having a set of operating system instructions and providing prioritized execution of the tasks by execution of the operating system instructions; an operating system interface causing instructions of the universal instruction set to be carried out by the multitasking operating system so that each universal instruction of the universal instruction set is executed as a sequence of at least one instruction of the operating system instruction set; and at least one processor controlled by the operating system to execute the asynchronous tasks.

Abstract: A GSM transceiver for use in a GSM network and a method of use of the GSM transceiver is disclosed. The GSM transceiver includes a multilayer protocol stack for executing a plurality of asynchronous tasks, the multilayer protocol stack including a radio resources management entity for controlling a physical layer and a data link layer of the multilayer protocol stack for establishing and maintaining a wireless link between the transceiver and the GSM network and a mobility management entity for establishing and authenticating services provided by the GSM network to the transceiver; and at least one processor for executing the plurality of asynchronous tasks of the multilayer protocol stack; and wherein only the radio resources management entity synthesizes channel establishment messages transmitted by the GSM transceiver to the GSM network and only the mobility management entity makes decisions to establish channels between the transceiver and the GSM network.

Abstract: A GSM transceiver unit (10), for use in a GSM network (84), having a multilayer portable protocol stack is disclosed. The multilayer protocol stack includes a hardware layer (204), a first portable layer (206) configuring the hardware layer and controlling communications to and from the hardware layer, and second and third portable layers (208) controlling communications to and from the first portable layer and utilizing the first portable layer for communications with the GSM network. The GSM transceiver unit (10) includes a dynamics description (202) containing at least one time delay with each time delay representing an integer multiple of a fixed time duration for a particular instruction to be scheduled and containing at least one time advance with each time advance representing an integer multiple of the fixed time duration for a particular instruction to be scheduled.

Abstract: A method of tracing execution of a computer program of a data processing system with print messages is disclosed.