Abstract: Method and arrangement for intercepting a target mobile station in a GPRS network. A legal interception node is installed into the land-based portion of the radio network. An “intercepted” status is defined for mobile stations that are to be intercepted. In response to an order from a law-enforcement authority to intercept one of said mobile stations the status of such mobile station is changed to “intercepted” and at least some of the packets originating from such a mobile station or terminated thereto are routed and/or copied from at least one of the support nodes via the legal interception node to the law-enforcement authority.

Abstract: A method and an arrangement for correcting nonlinearity of an I/Q modulator in a linearization circuit of an amplifier (8) of a transmitter, which circuit comprises an I/Q modulator (7), a predistorter (3), and a feedback arrangement (9, 12, 13, 14, 15 and 17), the arrangement comprising means (9) for sampling the I/Q-modulated measuring signal, which is formed from the measuring signals fed into the I- and Q-branches of the transmitter, means (14) for A/D-converting the signal samples taken from the signal, means (15) for I/Q-demodulating the signal samples digitally into I- and Q-feedback signals, means (17) for determining the nonlinearities of the I- and Q-branches of the I/Q modulator, and means (4A, 4B, 16A and 16B) for predistorting the I- and Q-signals supplied to the I/Q modulator (7) separately by means of the determined nonlinearities.

Abstract: The invention relates to a method and arrangement for connecting a processor to an ASIC. In the arrangement, the processor generates control signals employed when the processor reads data from and writes data to the ASIC. The arrangement comprises means (10) for receiving control signals from the processor and generating read and write signals on the basis of the received signals. The means (10) are implemented by an asynchronous state machine that changes its state on the basis of the received signals. The means (10) change their state without a synchronizing clock signal.

Abstract: A channel configuration of a digital mobile system comprises two or more lower-rate transmission channels for each high-speed radio interface traffic channel at the network interface between a base station and an interworking function. Radio frames, such as EDGE frames, are transferred on a radio interface traffic channel. Transmission frames, such as TRAU frames, are transferred on transmission channels. The total data rate at the network interface is greater than the data rate at the radio interface. According to the invention, the total data rates of the network interface and the radio interface are rate-adapted by transferring fill data in transmission frames in addition to payload between the base station and the interworking function, such that the average data rate of the payload at the network interface corresponds to the total data rate at the radio interface, and the combined total data rate of the fill data and the payload corresponds to the total data rate at the network interface.

Abstract: Known digital QAM modulators use sine/cosine memories and a plurality of multipliers. This can be avoided by replacing the circuitry which carries out the circular rotation of [I(n), Q(n)]T performed in all the QAM modulators, with a CORDIC algorithm. The invented QAM modulator is comprised of a plurality of digital rotation stages (72, 73 . . . 74) coupled in sequence. The first stage (72) receives the IIN and QIN data streams and the last stage (74) outputs a vector comprising of the orthogonal I and Q components of a digital intermediate frequency signal. Each of the rotation stages rotates an input vector applied to the stage at a predetermined elementary rotation angle, said input vector being the output vector of the previous digital rotation stage. The modulator further includes an angle computation block (710) for counting the elementary rotation angles for the rotation stages.

Abstract: A method and arrangement for correcting a phase error in a linearization loop of a power amplifier, the loop comprising an I/Q modulator (10), one or more delay-causing power amplifiers (13) to be linearized, an I/Q demodulator (11) for generating I and Q feedback signals from the output signals of the amplifier (13), difference means (20, 21) of the I and Q branches for generating I and Q difference signals from the I and Q feedback signals and the I and Q input signals, the I/Q modulator and the I/Q demodulator receiving an oscillator frequency from the same local oscillator (14), and a phase shifter (17), the method comprising determination of a phase error resulting from the delay produced in the linearization loop, which determination comprises feeding excitation signals to the I and Q inputs (I IN, Q_IN) of the linearization loop, measuring the signals resulting from the excitation signals and calculating a phase error by means of the measured signals and excitation signals, and correcting the phase err

Abstract: A method, and a radio transmitter using the method, is disclosed for scheduling air interface capacity between user services in a radio system. The method includes defining a nominal service bit rate, a nominal capacity of the service, and an effective coding rate of the service, and scheduling air interface frame capacity between at least two different services. The scheduling includes computing the bit rate of a first service by multiplying the nominal capacity of the first service by the effective coding rate of the first service, and adding to this normal bit rate of the first service borrowed extra capacity of at least one other service, the bit rate obtained from the extra capacity computed by multiplying a predetermined amount of the nominal capacity of the other service by the effective coding rate of the first service.

Abstract: The invention relates to method and code generator for updating linear feedback shift register (LFSR). The method comprises defining jumps corresponding to different powers of two for shifting from known state to new state. Then in each jump the LFSR obtained as a result of the jump in question is generated: the value of one element of the obtained LFSR is generated from the previous state and the pre-stored mask register corresponding to said obtained element, while the mask register determines the elements of the LFSR of the previous state, using which elements said element value is generated, and the generation of the value of one LFSR element is repeated for each remaining obtained feedback LFSR by shifting the mask register to the position of said remaining element and by generating the value of said remaining element of the obtained LFSR from the previous state and the shifted mask register.

Abstract: A radio signal transmitted from a transmitter to a receiver of a mobile communications system, such as the GSM system, often suffers from a phenomenon known as frequency offset by which the frequency of the radio signal is changed from a first frequency to a second frequency. A method is therefore provided for automatically correcting the frequency at the receiver to restore the received radio signal to approximately the first frequency using a multistage frequency correction algorithm. The radio signal comprises a training sequence that is known to the receiver and data symbols that are not known to the receiver. In the first stage of the frequency correction, the frequency offset is coarsely estimated based on the training sequence only, and the data symbols are frequency corrected by back-rotating the received data symbols and the training sequence by the frequency offset estimate.

Abstract: A method and apparatus for implementing call forwarding in a mobile communication system comprising one or more closed user groups. The method comprises detecting conditional or unconditional call forwarding to a call forwarding number in connection with call set-up, checking whether set call forwarding is directed to the voice mail, and carrying out call forwarding in response to the fact that call forwarding is directed to the voice mail, regardless of a possible bar to call forwarding due to interaction between the call forwarding facility and the closed user group. The method and system of the invention allow to eliminate the possible problems caused by the restrictions of the closed user group in connection with call forwarding to the voice mail.

Abstract: A apparatus for computing coefficient values for configuring a digital filter for compensating for non-linearity of an RF/IF device. The apparatus includes a reference signal generator, connected to an input of the RF/IF device, for generating an input reference signal to the RF/IF device. A vector signal analyzer, connected to an output of the RF/IF device, analyzes a response signal from the RF/IF device and outputs digital in-phase and quadrature-phase (I/Q) signals. A processor, connected to an output of said vector signal analyzer, computes a difference between the input reference signal and the digital in-phase and quadrature-phase (I/Q) signals. The processor calculates the coefficient values for configuring the digital filter based on the computed difference. A memory device, connected to the digital filter, stores the calculated coefficient values for the digital filter.

Abstract: An M-ary signal constellation within an N-dimensional space is defined, preferably such that each of the M symbols reside upon the surface of an N-dimensional sphere and such that a minimum distance between symbols is maximized. N orthogonal functions are used as the bases for representing the N-dimensional symbols for transmission. Orthogonal functions exhibiting orthogonality in frequency, time and/or space are also described for this purpose. Furthermore, conventional QAM symbol encoding may be used to represent the N-dimensional symbols, thereby facilitating the use of conventional modulation techniques. In this manner, higher dimensional modulation schemes may be realized.

Abstract: A robust IP/UDP/RTP header compression mechanism is provided to correctly reconstruct IP/UDP/RTP headers in the presence of packet losses and errors of unreliable networks. The header compression mechanism may include a compressor/de-compressor implemented for operation similarly to RFC 2508 but designed specifically to address robustness when employed in lossy and error-prone networks. The robust header compression scheme requires that, when a second-order difference of a field is non-zero, not only a particular RTP packet whose second-order difference is non-zero is sent with the new first-order difference, but also those following packets are also sent with the new first-order difference as long as: (a) a period pre-determined by factors such as channel characteristics (e.g., link round-trip time RTT/inter-packet separation); or (b) a positive confirmation is received by the compressor that the new first-order difference has been correctly received.

Abstract: A beamforming method and device for adaptive antenna arrays including several antenna elements (1.1. to 1.M) in the downlink of frequency duplex systems, wherein antenna weights (Wk(fS)) are determined for the antenna elements (1.1 to 1.M) for downlink transmission on the basis of directional information of the uplink; in detail, the antenna weights (Wk(fS)) for downlink transmission are determined on the basis of the power angle spectrum (APSk) of the uplink of the individual users (B1 to BK), wherein the power angle spectrum (APSk) is modified by masking out undesired regions.

Abstract: The invention relates to a telecommunication system comprising subscribers, a subscriber network, terminals for connecting the subscribers with the subscriber network and a set of services comprising network-specific services and supplementary services provided by the network and supplementary services transmitted by the network. In order to provide the subscriber with subscriber-specific service profiles differing from one another, the system further comprises memory means (SPR) including at least for one network subscriber not less than two different subscriber-specific (51) service profiles (52) comprising services defined for the subscriber from the set of services. The invention further relates to a mobile station and a subscriber register which can be utilized in the telecommunication system. The invention also relates to a method that can be applied to the telecommunication system.

Abstract: Antenna radiator, consisting of two plate-like or film-like parts (1, 2) connected by their foot ends (11) to each other and to the supply connection of the antenna. To reduce especially current and voltage losses, the radiator parts are substantially wider at the foot (1) than at the tip (12).

Abstract: A cell handover method and cellular radio system includes at least one indoor subscriber terminal (100) and cells (31 to 38) with operating area of each being confined to the interior of a building, and at least one outdoor cell (11) whose operating area extends from the exterior to the interior of the building, and in which cellular radio system the cell serving the subscriber terminal (100) will be changed, characterized in that the radio system is configured for cell handover in such a way that cells (31 to 38) are grouped into cell groups with a gateway cell (21 to 24) provided around each group, and with one gateway cell (21) provided at the entrance of the building, the gateway cell (21 to 24) surrounding the cell (31 to 38) is entered on the neighbor list of each cell (31 to 38), other gateway cells (22 to 24) and an outdoor cell (11) are entered on the neighbor list of the gateway cell (21) provided at the entrance, and the gateway cells (21 to 24) are entered on the neighbor list of the outdoor cell

Abstract: The object of the invention is to provide a method and an apparatus implementing the method which allow the subscriber to evaluate the authenticity of sender data in an incoming messaging message. Messaging centers are arranged to add an indication containing information on whether the identity of the sender of a message transmitted by the messaging center is guaranteed to data units containing a messaging message. If the data unit containing the messaging message comprises said indication, the subscriber's terminal indicates the information included in the indication to the subscriber.

Abstract: An access control system for controlling access by wireless terminals to a wireless telecommunications network, the access control system comprising: a database storing the identities of a set of wireless terminals belonging to the telecommunications network; a configurable store for storing a supplementary access value indicative of whether terminals that do not belong to the telecommunications network may access the network; and an access control unit for receiving an access request message indicating the identity of a wireless terminal and in response to that message accessing the database and/or the store to permit access by the wireless terminal to the wireless telecommunications network if: a. the identity of the wireless terminal is present in the database; or b. the supplementary access value indicates that terminals that do not belong to the telecommunications network may access the network.

Abstract: The addresses of a mobile station (MS) and a second party (B) connected to the Internet (12) are converted in such a way that a short message service center (SMSC) receives an allocation request (2-1) from a mobile station for allocating a virtual number (VN) to a combination comprising the address (IAB) of a second party preferably also a mobile station identifier. The SMSC sends a reply (2-2) to the mobile station, the reply indicating the allocated virtual number (VN). The mobile station (MS) transmits a short message (2-9) to the virtual member. The SMSC forms an Internet address (IAB) of the second party (B) on the basis of the virtual number (VN) and the allocation request (2-1) and sends to the Internet address an e-mail message (2-10) whose text part corresponds to the text part of the short message. The B party can reply (2-11) by using the reply function of the e-mail, which exchanges the sender for the recipient The B party can also use (2-13) the ISDN number of the mobile station.