Abstract: The invention relates to a method and a system for digital signal transmission. In this method, a signal is encoded in order to minimize transmission errors on a transmission channel, and the encoded signal is sent through at least two base stations. A user equipment then receives the encoded signal and the coding of the received signal is decoded. The method is in accordance with the invention characterized in that the encoded signal is divided into separate signal parts having at least partly different contents. Then a specific signal part is indicated for each base station, and the base stations send their specific signal parts. In reception, the information in the received signal parts is combined.

Abstract: The present invention provides a method and apparatus for auto-biasing an amplifier. The auto-bias system of the present invention has an auto-bias feedback loop that adjusts the bias condition of an amplifier to a wanted state between transmission periods. The system monitors a physical quantity indicative of the operating state of the amplifier and controls the amplifier bias so as to control the amplifier operating point sufficiently to compensate for variations in amplifier electrical characteristics, amplifier load, amplifier temperature, and input signals. The system further adjusts the amplifier operating point based on the modulation scheme used to modulate information included in an input signal provided to amplifier, thereby allowing the amplifier to operate in any one of multiple signal modulation systems.

Abstract: The invention relates to wireless telecommunication systems employing ATM technique (Asynchronous Transfer Mode) in transmission systems. A signalling arrangement between network elements comprises a protocol stack comprising on top a layer 3 user function for signalling between a wireless mobile station and a network, an ATM adaptation layer, an ATM layer and a physical later. In accordance with the invention the ATM adaptation later comprises on top a service-specific coordination function immediately between said higher user function and a service-specific connection-oriented protocol. Said service-specific coordination function comprises as functions the adaptation of the user function to the service-specific connection-oriented protocol and the establishment, discrimination and release of the signalling connections of the ATM adaptation later needed for conveying signalling messages of the layer user function. The invention provides a simple protocol stack that is easy to implement.

Abstract: The present invention relates to a procedure for ensuring the activation of a V5 interface formed between a local exchange and an access node. According to the invention, the checking of the operational condition of the primary and secondary links is started simultaneously both on the local exchange side and on the access node side, and if a confirmation indicating that the link is operational is received for the secondary link first, then a switchover of the primary link to the secondary link according to the V5 definitions is performed and the new primary link is used for protection in the V5 interface during the V5 interface activation process. The invention makes it possible to avoid unnecessary interruptions of activation during the V5 interface activation procedure.

Abstract: When implementing services compiled of service independent building blocks (SIB) in an intelligent network, the SIB parameters to be relayed in computer instructions are replaced with a global data structure, whereby no parameters at all are transferred in the instruction call. Having no parameters means that each SIB receives the parameters it needs from one global variable. The global variable is visible to all SIBs, whereby each individual SIB fetches the parameters it requires from it. As regards some SIBs it is rather certain that they will remain unchanged and thus really service independent, but for some there is no such certainty, and for this reason the SIBs may be divided logically into two groups: assisting and performing SIBs respectively. Parameters of the performing SIBs are not relayed in the sub-programme call, but in one or several global data structure variables.

Abstract: The invention relates to a tuning method used in a base station which comprises, in addition to at least one transceiver unit generating signals, a filtering means which is separate from the transceiver unit and filters signals which are generated on the transmitting end of the transceiver unit, of which signals part advances to the filtering means and part is reflected back, and which filtering means is tuned to operate in a predetermined frequency band. The transceiver unit comprises a test signal generating means which generates a control signal and a test signal that is located in a predetermined frequency band, which test signal is transmitted further to the filtering means, a means which generates signals of the same magnitude as the signal which advances to the filtering means and is reflected from the filtering means, which signals are connected from the transmitting end to the receiving end of the transceiver.

Abstract: The invention relates to a cellular radio system comprising a mobile exchange, a first base station communicating with the mobile exchange through a data connection, said base station comprising at least a first transceiver unit for establishing a connection to the mobile stations on one or more channels allocated to it for transmitting telecommunications signals between the mobile stations and the mobile exchange, and control means for controlling the first transceiver unit. In order to save available resources, the control means comprise means for deactivating the first transceiver unit when the traffic capacity need is small in the coverage area of the first base station.

Abstract: Simplifying functions representing raised sine or cosine curves to functions representing simple sine or cosine curves makes it possible to implement an electrical equivalent circuit for a ramp generator. The core of the ramp generator with an output power level controller is second-order direct-form feedback structure (60), which forms a digital sinusoidal oscillator. The initial values of two state variables x2(n), x2(n+1) of the oscillator are chosen so that they both contain a predetermined first constant value. This first constant value will emerge as the amplitude value of the pure sine wave generated by the oscillator. Particularly the first constant value is equal to the desired nominal level A of the ramp minus the starting level. A second constant value (A+dc) is added to the oscillator output. The added result is scaled (66) so that the nominal power level is A. A multiplexer (67) keeps the power level between the ramps constant.

Abstract: The present invention relates to an up conversion RF mixer having first differential transistor pair comprising first and second transistors and a second differential transistor pair having third and fourth transistors. The emitters of the first and second transistors are connected to the drain of a fifth transistor and the emitters of the third and fourth transistors are connected to the drain of a sixth transistor. The sources of the fifth and sixth transistors are connected to drains of seventh and eighth transistors, respectively. A local oscillator signal is connected to the bases of the first and second transistors and to the bases of the third and fourth transistors. A first intermediate frequency signal is connected to the gate of the fifth transistor and the gate of the eighth transistor. A second intermediate frequency signal which is the inverse of the first intermediate frequency signal is connected to the gates of the sixth and seventh transistors.

Abstract: An ISDN telecommunication system and a method for implementing a private branch exchange interface. The system comprises an ISDN exchange (1), a primary rate interface (2), a PBX interface (3) and an ISDN PBX (4) provided with a multi-channelling device (6) for dividing the primary rate interface (2) into at least two PBX interfaces (3, 3′). In the invention, a B channel in the primary rate interface is converted into a D channel, which is used in the PBX interface (3, 3′). On the other hand, the information in the D channel of the primary rate interface (2) can be used and is distributed between the PBX interfaces (3, 3′).

Abstract: The invention relates to a method for compensating signal dispersion in an optical communication network and to an optical communication network. The dispersion compensation is carried out by constructing the network in such a way that a route having an even number of phase conjugating means can be found between any two nodes. The routing is primarily made along a route in which there is the minimum even number of phase conjugating means between the terminal nodes. A preferred embodiment of the invention is a ring network constructed of two concentric rings in such a way that both rings comprise the same node points, but the number of phase conjugating means to be installed in said rings, in the optical fibers between adjacent nodes is, for example, even in the outer ring and odd in the inner ring.

Abstract: The invention relates to a passenger transportation system and method for transporting a passenger from a starting point (P1) along a passenger route to a destination (P2) by at least one transporter using a transporter route (B′-B″) which overlaps at least partially with the passenger route. The system comprises a transport service provider TSP unit (1) comprising transporter route information and served network area information and being enabled for communicating passenger position data and transporter identification data with the passenger and transporter position data as well as pick-up and release notification data with the transporter; such that the passenger route is composed of at least one section of a selected overlapping transporter route. Using said system and method is more convenient to the passenger.

Abstract: A method of managing a subscriber service by an intelligent network service in a telecommunications system, which comprises a mobile communication network including a home location register and at least one switching center; and an intelligent network including a service control point and a number of network elements with a service switching function. An intelligent network service is inserted into the service control point, the intelligent network service comprising a management function which is activated in response to the fact that a detection point having a predetermined trigger condition is encountered. The home location register comprises a service switching function, or at least the part of it essential for processing a detection point. An intelligent network service detection point whose trigger condition includes a condition that a situation should exist in which the mobile subscriber wants to manage the subscriber service or the intelligent network service related to it himself.

Abstract: In order to make the change of subscription type easy for subscribers using prepaid subscriptions, information indicating the types of a last used voucher and a new voucher is maintained. This information can be used to determine the types of said vouchers, to detect a change of subscription type and to select the proper way to update the credit.

Abstract: The invention relates to the provision of prepaid services for the customers of a telecommunication network operator in a wired and/or mobile telephone network. The invention makes it possible to implement prepaid call services even in countries with a low level of development of telephony. In the procedure of the invention, it is not necessary to identify e.g. DTMF tones, but the normal dialling system can be used to the verification of right of use of the service.

Abstract: The invention relates to a control method and a control arrangement which comprises a feedforward power amplifier (10), which receives and amplifies a signal and which on amplifying the signal causes non-linearities to the signal. The control arrangement also comprises adjusting members (50, 80) and adaptation means (110, 130), which form an adaptation factor and control the operation of the adjusting means (50, 80) by means of the adaptation factor by adapting the amplitudes and phases of signal propagating along different signal paths to one another. The control arrangement further comprises control means (120), which produce information of the gain required by the power amplifier (10), said control means (120) ordering the adaptation means (110, 130) to adjust the adaptation factor in advance on the basis of the received information to correspond to the gain of the power amplifier (10), which enables adaptation of the signal also when the input power level changes rapidly.

Abstract: Procedure for providing an answering service in a telecommunications network (1), which comprises a first short-message service center (2); a telephone network (3) using digital signalling and connected to the mobile communication network and a number of telecommunication terminals (4; 41, 42, . . . , 4n), which are compatible with the mobile communication and/or telephone network, in which procedure a response message is transmitted from a called party's telecommunications terminal to a calling party's telecommunication terminal after the calling party has tried to call the called party, who has activated an answering service in his/her telecommunication terminal. According to the invention, the response message is a predetermined short message. The telephone netowrk (3) isi connected to the first short-message service center (2) via a first telecommunication link (6).

Abstract: Procedure and system for the transmission of a short message in a telecommunication network comprising a mobile communication network (1) which comprises a first short-message service center (2); a telephone network (3) in which digital signalling is used and which is linked to the mobile communication network; and a number of terminal device (4; 41, 42, . . . , 4n) compatible with the mobile communication and/or telephone network, in which procedure the short message is generated by means of a terminal device and sent to the intended receiver. According to the invention, the telephone network (3) is connected to the first short-message service centre (2) via a first data communication link (6). The subscriber type identifier of the receiver is added to the short message, and the short message is transmitted to the first short-message service centre (2).

Abstract: The invention relates to an arrangement for implementing a planar magnetic circuit on a circuit board. The arrangement includes (a) printed circuit board (PCB), wherein a conductive wire pattern of an inductive circuit is formed as well as openings through the circuit board close to the conductive pattern, (b) two ferrite pieces, at least one of which can be fitted into the openings so that the pieces may be pressed against one another from opposite sides of the circuit board, and (c) a mechanical clamp which can be fitted around the ferrite pieces to lock them to each other, whereby the clamp extends around the ferrite pieces located on both sides of the circuit board.

Abstract: The invention relates to a procedure for the processing of an unexpected disconnect request in an access node (AN) which is connected to a local exchange (LE) over a V5 interface. In the access node (AN), call setdown is effected by means of a disconnect message, which is sent from the local exchange (LE) and on the basis of which the call resources in the local exchange (LE) are released. According to the invention, the resources reserved in the access node (AN) for the call are preserved. Moreover, the local exchange (LE) is informed that the subscriber is busy, thus preventing the occurrence of an undefined condition between the local exchange (LE) and the access node (AN).