Abstract: A precision-controlled logarithmic amplifier having reduced interference parameters. In an embodiment, the invention comprises a logarithmic amplifier having an output signal providing a logarithmic representation of an input signal. A precision-control circuit is coupled to the logarithmic amplifier. The precision-control circuit produces a bias and a saturation current that act to reduce the effects of bias and saturation currents that are produced in the logarithmic amplifier and affect the output signal of the logarithmic amplifier.

Abstract: A network arrangement and a method for connecting a message-based system (using message-based synchronization) with an external system by converting the synchronization status received from the external system into the internal synchronization status of the message-based system in an interface node of the message-based system in such a manner that the level in the internal synchronization hierarchy of the message-based system (as indicated by the internal synchronization status) rises or falls corresponding to a corresponding rise or fall of a predetermined magnitude occurring in the synchronization status of the external system.

Abstract: In channel allocation, the objective is to allocate channels to desired connections using the available frequency spectrum as effectively as possible so that the connections will not cause excessive interference to each other. This invention presents a method based on time blocking of transmission in connections using different transmission powers, in order further to improve the allocation of channels.

Abstract: Upgrading of a subscriber connection to another requires an upgrading work done by an electrician. According to the invention, the type of connection is upgraded by remote control. A switch matrix bus including several parallel lines (1-8) is placed in the access node. Connected fixedly in advance to the bus are interface units of an ADSL connection and, when desired, of an ISDN connection, however, in such a way that only one interface is connected actively to one bus line at a time. A controlled switch element (SE1, SE2) connects a line coming from a test relay (R3) located between the end of the subscriber line (e.g. SL3) and its interface to the switch matrix bus instead of the test bus. With a remote control signal supplied through network management a choice is made of which test relay connects the connected subscriber line to the controlled switch element.

Abstract: A method for identifying a fast speed mobile station (MS) in a radio system, said method comprising measuring the frequency error of radio signals received from a mobile station. In order for a fast speed mobile station to be more reliably identified than before, the method comprises calculating the change (df) in BSC the frequency error from a time interval (t) of predetermined length, and identifying the mobile station as a fast speed mobile station if the change (df) in the calculated frequency error exceeds a predetermined limit value.

Abstract: Radio frequencies of a base station in a cellular network are chosen adaptively so that when choosing the uplink frequency the base station measure at all frequencies or at some frequencies of the reception band used in the system what is the total power of the signal received at the frequency in question. The frequency at which the lowest power is received is chosen as uplink frequency. When choosing the downlink frequency, a tuning signal is transmitted at all frequencies or at some frequencies of the transmission band. Mobiles located in areas of other cells and operating at the same frequency experience the effect of the tuning signal as an interference. The base station is tuned to use that downlink frequency at which the interference caused by itself to other traffic is sufficiently low.

Abstract: A method and system is used in a communication network for charging a flat- rate for a customer's Nominal Bit Rate (NBRp) of the network as well as providing a variable actual Nominal Bit Rate (NBRr) suitable for momentarily desired high nominal bit rates requested by the customer. In one embodiment, the network provides a maximum pool size (Smax) which is predefined between a network operator and the customer. In another embodiment, instead of having the maximum pool size, the network provides the variable NBRr by filling the NBR pool progressively as a function of NBRp, a customer's desired Nominal Bit Rate (NBRd), and a constant z, for a period of time. A momentarily much higher NBRr can be provided based on the capacity of the filled NBR pool.

Abstract: When a dynamic channel allocation method based on monitoring of signal levels is used for channel allocation, the results of signal level measurements must be averaged in order to achieve a sufficient reliability. Averaging causes a delay in measurement results, for which reason such a channel may be allocated the interference level of which has just changed e.g. because another connection has been set up which functions nearby on the same channel. According to the invention, allocation of a channel causing excessive interference with a connection already set up is limited.

Abstract: In a packet radio network, a mobile station (MS) has an active state and a standby state. In the active state, the mobile station performs data transmission and updates its location more often than in the standby state. The mobile station changes from the active state to the standby state if there is no data transmission during a predetermined period. The packet radio network (SGSN) may also direct, if required, the mobile station (MS) from the active state to the standby state. The mobile station (MS) transmits to the packet radio network a short pseudo data packet either before the timer expires or in response to a command transmitted by the packet network to change the state (GO STANDBY) when the mobile station wants to stay in the active state.

Abstract: Implementing a method for a handover between mobile switching centers (MSC-A, MSC-B) of a cellular mobile network in high-speed data transmission wherein several channels are allocated to a mobile station (MS). In the method, the first mobile switching center (MSC-A) indicates to the second mobile switching center (MSC-B) at least the minimum number of channels required over the connection. The second mobile switching center (MSC-B) attempts to allocate at least the indicated minimum number of channels. The second mobile switching enter (MSC-B) transmits to the first mobile switching center (MSC-A) data about the channels it has allocated and at least one handover number (HON). The first mobile switching (MSC-A) may use the same handover number (HON) to perform a handover to each subchannel. According to a preferred embodiment of the invention, as many handover numbers (HON) are allocated directly as there are channels allocated to the connection.

Abstract: The invention relates to the implementation of an access service in a telecommunications network comprising an access network, a network providing services, and user-operated terminals which are connected to the access network. The access service is offered by connecting the user terminal to the network providing the services through interface elements which connect the access network and the network providing the services. As a response to the access service at least one charging record is generated. The record is transferred to billing means for billing the access service subscriber for the access service. So that it would be possible to combine the access service with reliable and versatile billing in a connectionless network, the terminal is used to generate charging messages which are provided with a subscriber-specific digital signature, and the signatures generated by the terminal are verified outside of the terminal.

Abstract: A mobile communications system and method for use in a high-speed data transmission between a mobile station and a mobile communications network in the mobile communications system based on time division multiple access (TDMA). The mobile communications system is arranged to use a different frequency for a transmitting direction and a receiving direction.

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: The invention relates to a method for reducing interfering signals from an output signal of a digital synthesizer arrangement and to a synthesizer arrangement which comprises a reception means (10) which receives a signal which determines the frequency of the output signal to which is added a signal which breaks the periodicity of the signal. The arrangement comprises a means (40) which forms, on the basis of the received signal, a signal which comprises the information on the phase used in the output signal, a generator means (60) which forms a pseudo-random signal, a summing means (20) which forms a sum signal by adding the signal comprising the phase information to the signal used in determining the frequency and to the pseudo-random signal, and in which means part of the signal formed by the means (40) is added to a next sum signal.

Abstract: The invention relates to a method of handling the event recordings in a service database system. The database comprises measurement tables (MT) which include consecutive rows (Ri). So that the length of the recording interval can be changed at any time without interrupting the measurement, the system (a) maintains a time value which corresponds to the following expected changing moment of the recording interval and compares the current clock time value to the value of the expected changing moment to detect the changing moment of the recording interval, and (b) updates the time value of the expected changing moment and the length of the current recording interval according to the new time value of the changing moment as a response to the change in the length of the recording interval.

Abstract: The invention relates to a data transmission method and a base station for a TDMA radio system, the base station comprising at least two tranceivers (300, 304) adapted to communicate with terminals within the base station area, the base station being adapted to transmit information concerning itself to the terminals, and the transceivers being adapted to communicate with the terminals within service areas that are at least partly different so as to form an inner (202) and an outer (204) service area. To enable an advantageous implementation of a cell, only the transceiver (304) serving the outer service area is adapted to transmit information concerning the base station.

Abstract: A TDMA cellular radio system and a method of allocating available frequency bands to different cells in a TDMA cellular radio system wherein at least some of the receivers within the system use interference cancellation methods which cancel the effects of co-channel interference in a desired signal. To enable efficient use of interference cancellation and the resulting capacity increase in the system, the frequency bands available for the cellular radio system are allocated to different cells so that groups of adjacent service areas are formed in the system. Each group uses the same frequency band within the service areas, whereby at least one co-channel signal interfering with the desired signal is significantly stronger than other co-channel interfering signals.

Abstract: In a re-routing procedure according to the invention, in-stead of establishing a new connection, the context information is modified only in those network elements which the change in routing concerns. The necessary context information about the connection is loaded to the new network element. Additionally, the other network elements participating the connection are informed of the change of the network element.

Abstract: The invention relates to a method of handling event recordings in a service database system. The database contains measurement tables (MT) which include consecutive rows (Ri). A single row contains data about a single measurement object. So that recording of a large counter group could be performed efficiently and, nonwithstanding, the measurement could be started without delay for all objects, (a) a single measurement counter is maintained copied to N copies on the row corresponding to each measurement object of the measurement table (b) time domain is divided into consecutive recording intervals so that only the values of a selected counter group located on the row are incremented during each recording interval, and (c) the recording and zeroing of the counter values is handled during a recording interval one measurement object at a time.

Abstract: The structure according to the invention employs a latch circuit without a reset input as a structural unit for memory. The memory structure's input bus is duplicated and the value of the first bus is forced to “0000” and the value of the second bus is forced to “1111”. In a reset state the latch circuits are driven transparent so that each memory bit's reset state depends on which of the buses the latch circuit is connected to. The structure according to the invention fulfils the requirement of an arbitrarily selectable reset state while at the same time the memory can be implemented using the smallest possible elements, i.e. latch circuits without reset inputs.