Abstract: A system for recording a video session includes a video server and a client coupled to the video server using a communication path. The video server communicates a start record command. The client determines the processing capacity of the client and establishes a recording interval in response to the determined processing capacity. The recording interval indicates a time between a first recording time and a second recording time. The client records a first video frame at the first recording time in response to the start record command, and records a second video frame at the second recording time. The first video frame includes first video data and the second video frame includes second video data. The client generates a video sub-frame comprising the second video data that is different from the first video data.

Abstract: A database is formed for providing two intelligent network services in connection with the same call, the database comprising data on the mutual compatibility of the different intelligent network services. In connection with each such call which involves at least one first intelligent network services and one second intelligent network service, an exchange receives the data on the first intelligent network services. If this data is sufficient for arming detection points, the exchange arms the detection points from which the first intelligent network services will be activated if the activation criteria are met during the call. The exchange also determines the data for arming a second detection point from which the second intelligent network service will be activated if the activation criteria are met during the call.

Abstract: The invention relates to a data transmission method and radio system. In particular, the invention relates to a method and system in which both the GMSK and the m-PSK modulation methods are available for the signal to be transmitted an in which the modulation method used at a given time can be changed to another modulation method. In the solution of the invention, the m-PSK modulator of the transmitter includes a multiplier adapted to multiply the signal to be transmitted by a given coefficient making the signal constellations of the received signal similar regardless of the modulation method. Thus, the processing of the signal in the receiver becomes easier and the quality of the transmission improves in connection with m-PSK modulation.

Abstract: A method and equipment for providing frequency synchronization in a telecommunications system, wherein time stamps providing timing information are transferred over a packet-switched network from a transmitter network element to a receiver network element having a receiver oscillator. The expected times for reception of time stamps are estimated (i), deviations from the estimated expected time for the time stamps are calculated (ii) and at least one time stamp deviating most from the estimated expected time is removed (iii). The steps (i)-(iii) are repeated until a pre-determined number of time stamps is removed. Frequency of the receiver oscillator is then estimated using the remaining time stamps and the frequency generation of the receiver oscillator is adjusted based on the estimated frequency.

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: 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: 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 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: 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: 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).