Abstract: A method for determining if a signal received at a radio receiver in a communication system is transmitted to the receiver via a direct radio link comprising the steps of: determining a signal characteristic based on one or more signal measurements collected at the receiver; comparing the signal characteristic as determined with at least one predetermined system parameter; and responsive to said comparison determining if said signal is received via a direct link.

Abstract: A method of controlling a satellite communication system, a timing unit, and a control unit of a timing unit. The method comprises dividing the coverage area of the satellite communication system into one or several geographical areas; positioning one or several timing units in at least one geographical area; determining which of the satellites of the satellite communication system are visible in each particular geographical area; controlling the timing unit with a control unit, in order to minimize the time difference within the system, to listen to one or several satellites visible in each particular geographical area, the signals received from the satellites by the timing unit fulfilling a predetermined condition; synchronizing a predetermined number of geographical areas with each other by means of the control unit of the system such that the time difference within the system is minimized in a predetermined combination area of geographical areas.

Abstract: A method for calculating the location of a mobile user terminal in a wireless communication system, comprising the steps of: identifying a default sequence in which a plurality of location calculating methods should be executed to calculate said location; forming a new sequence by reordering said default sequence responsive to at least one system parameter; and executing at least one of said calculating methods in accordance with the new sequence to thereby calculate said location.

Abstract: For synchronous transmission between two telecommunications units, the devices must always be synchronized. Typically, a reference signal is required for synchronization. The reference signal can be transmitted from one unit to another embedded in the data signal. If the data is transmitted via a transmission network modulated in the way required by the network, the reference signal is not always received by the receiver together with the data signal. The problem is solved by this invention by converting the reference signal before its transmission into the transmission network for the frequency band used for transmission in the transmission network.