Abstract: The invention relates to a method for estimating the interference level in a cellular radio system comprising in each cell a base station (100) in each cell, and a number of subscriber terminals (108 to 112) communicating with the base station. The terminals measure power levels from those frequencies which are on the list that is maintained by the terminal and comprised those base stations and frequencies to which the terminal can perform a handover. In the solution of the invention the list also comprises frequencies whose power level information is used for the frequency planning of the system. Frequency planning can thus be implemented without any separate means.

Abstract: A method of implementing dynamic channel allocation in a cellular radio system. The cellular radio system includes, in each cell, at least one base station communicating with subscriber terminals within its area. The system includes, in one cell, at least two subeeils, which include an anrenna unit and in which all available frequencies are dynamically used. All antenna units listen to control channels that subscriber terminals use for connection set-up and a base station measures the power level of the control channels through the antenna units, on the basis of which an antenna unit providing the strongest sigxzal is selected for conricction set-up. The base station measures through the antenna units the interference level of all available traffic channels, on the basis of which that traffic channel in an antenna unit selected for connection set-up which has the least interference is selected for communication.

Abstract: The invention relates to a reception method and a receiver used in a TDMA radio system. The receiver receives signals placed in time slots allowing the receiver to establish connections. The receiver receives the signals, which are placed in time slots and vary in strength. The receiver comprises amplification means amplifying the received signals with an amplification coefficient of a particular size. The receiver is arranged to receive connection establishing signals from time slots and to form at least two sets of time slots from the time slots, and the amplification means amplify the signals in different sets of time slots with an amplification coefficient of a different size. The amplification means amplify the signals in the same set of time slots with an amplification coefficient of the same size.

Abstract: The invention relates to a data transmission method in TDMA mobile communication system. In a mobile communication system employing a so-called multi-slot access technique, one or more time-slots may be allocated to a mobile station for data transmission at the data transfer rate required by an application using the mobile station. In the invention, upon establishing a data call, the mobile station (MS) indicates the mobile communication network (BTS, BSC, MSC) the minimum and the maximum requirements for the user data transfer rate (Set Up). The mobile communication network assigns the mobile station (MS) for a data call a channel configuration, depending on the network resources currently available in the mobile communication network and enabling a data transfer rate which is between the minimum requirement and the maximum requirement.

Abstract: A receiver receives a plurality of different signals at the same time. The receiver comprises means for identifying at least one strongest signal of said plurality of different signals and a filter for attenuating said at least one strongest signal with respect to the other of said plurality of signals.

Abstract: A multi frequency carrier transmitter comprises input means for receiving a plurality of different digital signals to be transmitted. The different signals are to be transmitted on different carrier frequencies. Amplifier means receive a composite signal comprising the different signals at the respective carrier frequencies and amplify the composite signal. Predistortion means predistort the plurality of digital signals prior to amplification of the composite signal by the amplification means. The predistortion provided by the predistortion means is subsequently altered in dependence on the difference between the input signals and the output at the amplifier means.

Abstract: The invention relates to a method of implementing a handover in a cellular radio system. The cellular radio system has at least on cell (Cd) which comprises at least two subcells and in which all available frequencies are dynamically used. The cellular radio system comprises in each cell (C, Cd) at least one base station (BTS) which communicates with subscriber terminals (MS) located within its area. A handover from an old cell to a new cell (Cd) applying dynamic channel allocation is characterized in that only BCCH carrier frequency time slots comprising control channels are transmitted all the time in all subcells of the cell(Cd). The method allows traffic channels of a BCCH carrier frequency to be dynamically reused in subcells of the cell (Cd), providing the improved system capacity.

Abstract: The invention relates to a method aiming at dynamic division of the radio capacity in a TDMA system dynamically between packet radio service and circuit switched service. According to the invention, some basic number of time slots are reserved for packet radio service and the rest are reserved for circuit switched service. When the traffic requirement of packet radio service increases, information regarding this is obtained by means of a request from a mobile station or through traffic measurement at the base transceiver station. This information is used as a criterion in allocating more time slots to packet radio service.

Abstract: A multi-carrier transmitter has combination means for receiving and combining a plurality of carriers including a first modulated carrier for transmission in a first channel and a second modulated carrier for transmission in a second channel, to create a multi-carrier signal. Power control means are arranged to individually vary the power of each of the plurality of carriers before combination.

Abstract: In a cellular communication system, multiple TDMA time slot channels may be assigned to a single mobile station. The network may dynamically adjust, during a call, the number of channels assigned to any one mobile station based on resources available to the network and based on a level of service desired by the mobile station. In this manner, mobile stations having varying bandwidth requirements can be efficiently served by a single communication system.

Abstract: A data transmission in a digital mobile communication system employing a so-called multi-channel access technique, in which one or more traffic channels may be allocated to a mobile station for data transmission in accordance with the data transfer rate required by the application using the mobile station. Upon establishing a data call, the mobile station indicates to the mobile communication network the maximum and optionally the minimum requirements for the user data transfer rate. The mobile communication network assigns the mobile station for a data call a channel configuration consisting of one or more traffic channels in connection with call set-up or handover, the channel configuration depending on the resources currently available in the mobile communication network and enabling performance of the data channel, which is not lower than the minimum requirement and not higher than the maximum requirement.

Abstract: For data transmission in a digital mobile communication system, in a mobile communication system employing a so-called multi-channel access technique, one or more traffic channels may be allocated to a mobile station for data transfer, in accordance with the data transfer rate required by the application using the mobile station. Minimum and maximum requirements are determined for the data transfer rate of the user data. The mobile communication network dynamically adjusts the channel configuration assignment to the mobile station for the data call, so as to consist of one or more traffic channels, within the limits of the minimum and maximum requirements of the data transfer rate, depending on the changing allocation state of the resources of the mobile communication network.

Abstract: The present invention relates to a base station of a radio system. The base station has means for establishing a telecommunication connection to radio units in a coverage area of the base station. In order to utilize a capacity of the base station efficiently, the base station comprises a central processing unit with at least one baseband frame unit for supplying baseband signals via switching means, alternatively, to one of at least two radio channel units, and at least two radio set units arranged separately from one another of which at least one of the radio set units is arranged at a distance from the central processing unit. The radio set units are arranged into different radio set units for transferring baseband signals to be transmitted from the frame unit to a radio channel and for forwarding radio frequency signals via an antenna means of the radio set unit.

Abstract: A method and arrangement for high-speed data transmission in a TDMA mobile telecommunications system. A high-speed data signal is split into at least two signals of lower speed prior to transmission over a radio path. At least two time slots for each frame are allocated for a mobile station. The time slots from each frame correspond to a number of the signals of lower speed. Modulation and burst building operations are carried out separately for each of the signals of lower speed. Data is transmitted over the radio path between the mobile station and a base station as bursts in a time slot allocated to the mobile station by successive frames, so that each of the signals of lower speed is transmitted in a different one of the time slots.

Abstract: The invention relates to a wireless local loop system comprising base stations and an access network node which connects the cordless terminal equipments (T) to the exchange of the fixed network. The air interface between the cordless terminal equipment and the base station is mainly in accordance with the GSM mobile system. In addition to the base station, the terminal equipment (T) also measures the field strength and quality of the radio channel. There are at least two measurement periods during a multiframe of a traffic channel (TCH), and the terminal equipment transmits the measurement results of the first measurement period on a single burst in a time slot of a slow associated control channel (SACCH) and the measurement results of the second measurement period in a single burst in a time slot of an IDLE FRAME.

Abstract: A method for performing encoding in a cellular network includes, in each cell, at least one base station communicating with terminal equipment within its coverage area, and a mobile switching center controlling the operation of the base stations. In order to improve the transmission quality over a connection between two terminal equipment, when the mobile switching center detects, during call set-up or handover, that the call is between two terminal equipment located within the area of the mobile switching center, the mobile switching center guides the transcoders of base stations communicating with the terminal equipment to a mode in which the transcoders adapt the rate to fit the transmission network, but do not encode the speech signal.

Abstract: The invention relates to controlling transmission power and carrying out a handover during a data transmission over the radio path between a mobile station and a base station (BTS) in a mobile telecommunications system. A mobile station can be allocated at least two traffic channels for a high-speed data transmission. The mobile station is arranged to measure the characteristics of the received signal, such as the signal level and/or quality, in each of the allocated traffic channels. The radio network is arranged to control the transmitting power of the mobile and base stations and make the decision on a handover on the basis of a combination of measurement results of two or more traffic channels, or on the basis of the measurement result of the poorest traffic channel.

Abstract: A method and an arrangement for controlling transmitting power of a mobile station and carrying out a handover in a mobile telecommunications system in which data is transmitted over the radio path between a mobile station and a base station as bursts in time slots of successive frames. A mobile station can be allocated at least two time slots in each frame for high-speed data transmission. The mobile station is arranged to measure the characteristics of the received signal, such as the signal level and/or quality, in each time slot allocated to the mobile station, and the fixed radio network is arranged to control the transmitting power of the mobile station and/or make the decision on a handover on the basis of a combination of measurement results of two or more time slots, or on the basis of the measurement result of the poorest time slot.

Abstract: The invention relates to a method aiming at dynamic division of the radio capacity in a TDMA system dynamically between packet radio service and circuit switched service. According to the invention, some basic number of time slots are reserved for packet radio service and the rest are reserved for circuit switched service. When the traffic requirement of packet radio service increases, information regarding this is obtained by means of a request from a mobile station or through traffic measurement at the base transceiver station. This information is used as a criterion in allocating more time slots to packet radio service.