Abstract: The invention relates to a connection-oriented packet-based communication network, in which the terminal and the network access point of the terminal may move in the network. When the access point of the terminal changes during an active connection, the routing connection can also be changed from an old access point to a new one. The old access point may comprise buffered cells, which can be transferred to the new access point without packet loss. A connection from the old access point to the new one is established dynamically, when required. The connection establishment is controlled by a third network element, which is responsible for controlling the change of access point. The old access point can be arranged to send signaling messages and to establish a connection without requiring any additional intelligence at the access point. Upon the connection being established, the old access point sends buffered unsent packets to the new access point.

Abstract: The invention relates to a method for eliminating interference in an OFDM (Orthogonal Frequency Division Multiplexing) radio receiver In the method, coded signals that are transmitted on subcarriers are received, reliability information generated for the signals being used in their soft decoding In accordance with the invention, the signal-to-interference ration of the subcarrier is used as the reliability information, the signal-to-interference ratio being defined by dividing the amplitude of the received signal by the interference amplitude. The interference amplitude is generated by calculating the deviation of the amplitudes of a set of selected signals from the average amplitude level of the set of signals. The average amplitude level of the set of signals is the mean value, median or some other statistical quantity indicative of the average level of the amplitudes of the set of signals.

Abstract: General Packet Radio Service is a new service designed for digital mobile systems. Because of bottlenecks, such as an air interface (Um), queues may be formed in routers. Long transmissions of data may slow the operation of interactive applications so that it is no longer sensible to use the applications. In the routers, separate queues are formed for each service, quality of service, connection, subscriber and/or application/application class. Quality of service can be indicated by providing each packet with an identity indicating the quality, or a change in the quality can be signalled as separate messages. The amount of data sent from a queue at one go may be controlled primarily based on quality of service of the subscriber. When packets are sent from a queue, it is monitored whether only a small number of packets remains in the queue, and if so, these packets are sent as well.

Abstract: A method for allocating a data transmission channel/sub-channel in a telecommunication network. A network includes a telecommunication controller (BTS) and several terminal equipments (MS). The transmission channel is divided into one or more time slots, each of which comprises one or more sub-channels. One or more time slots or sub-channels can be used as a control channel that is further divided into one or more control sub-channels. The terminal equipments (MS) send data in data packets at least on one sub-channel. The telecommunication controller (BTS) sends to the terminal equipments (MS) information about control sub-channels and their allocation situation. Different priorities (P1 to P4) are assigned to the data packets to be sent and to be control sub-channels and their allocation priority of the data packet to be sent and the priority of the control sub-channels, each terminal equipment (MS) determines the moments when it may send a channel request.

Abstract: A method for monitoring with discontinuous BCCH carriers in GSM, in which a mobile station can monitor a neighboring base station in each frame, or one in each frame. i.e. once in 4.615 ms, even where the base stations do not transmit continuously on a beacon carrier. Control information is intermittently transmitted from one or more base stations to one or more mobile stations. Traffic information is transmitted between the base station and the mobile station. The base station using n (n less than 8) time slots of a TDMA frame. The base station is monitored by the mobile station within a predetermined time slot of the TDMA frame during which the base station transmits additional information that is neither control information nor traffic information. The monitoring by the mobile station during the predetermined time slot (TS) is synchronized with the monitoring of further provided mobile stations.

Abstract: The invention relates to a reception method and a receiver. Mechanisms are used for generating, at each level, numbers relating to a bit 1 and a bit 2 and representing a probability of a transition metric of survivor paths. Mechanisms are used for separately summing the numbers relating to the bit 1 and the bit 0 of more than one state and representing the probability of the transition metric. Mechanisms are used for generating logarithms of the sums and means for generating a difference of the logic numbers relating to the bit 1 and the bit 0 representing the probability of the transition metric, whereby a received bit can be determined without a correct path tracing phase.

Abstract: The invention relates to a method for measuring imperfections in a digital quadrature modulator and demodulator operation, and to a digital quadrature modulator and quadratue demodulator.

Abstract: The invention relates to an acoustic echo suppressor and a non-linear processor for an echo canceller in a 4-wire data transmission network. An echo canceller is typically controlled by comparing the power levels of the near-end and far-end signals. The transfer function of an acoustic echo path is usually very non-uniform. According to the invention, the spectrum of the far-end signal is treated, before the signal power level is calculated, with a weighted filter, which models the effect of the transfer function of acoustic echo. As a result, the double talk dynamics is improved, since high-energy vowels of far-end speech, which normally cause low-energy vowels of near-end speech to be clipped in an echo suppresseor, will be attenuated.

Abstract: A method and apparatus for data transmission in a time division multiple access (TDMA) mobile communication system, in which one or more time-slots may be allocated to a mobile stations for data transmission. The mobile station indicates, upon setting up a data call, to the mobile communication network a desired level of service for the user data transfer and the mobile communication network assigns the mobile station for a data call a channel configuration consisting of one or more time- slots in connection with call set-up or handover. The assigned channel configuration depends on the resources currently available in the mobile communication network and enables a data channel performance which is within the limits of the desired level of service.

Abstract: The present invention is a system (100, 200, 300) and a method of data transmission in a communication system comprising a source node (12) which originates packet data transmissions, a packet data network (18), at least one router or switch (16, 20) and a destination node (14) which receives the packet data transmission.

Abstract: Method measures imperfections in digital quadrature modulator and demodulator operation, and to a digital quadrature modulator/quadrature demodulator. The modulator includes means for modulating quadrature-phase I and Q input signals to generate an output signals to generate an output signal including quadrature-phase I and Q components; means for taking momentary amplitude samples from the output signal of the modulator at a rate based on a symbol clock of the modulator; means for classifying a direction angle of the symbol to be modulated at a particular time into a particular direction angle sector; means for linking the amplitude samples of the output signal to the direction angle sector corresponding to the symbol to be transmitted at a particular time, and means for comparing amplitudes of samples belonging to each direction angle sector with other direction angle sectors or with an ideal value for determining imperfections of the output signal of the modulator.

Abstract: In order to integrate repeater management with network management in a wireless telecommunication network, a database is added to the network management center (NMC), said database including the data on the network repeaters (R1, R2, R3), which include for each repeater (R1, R2, R3) at least the identifier of the base station (BTS) corresponding to the repeater concerned; a repeater plan is made for changing repeater parameters to correspond to the changed configuration of the base stations; and each repeater is sent an update message (B1, B2, B3) containing parameters for the reconfiguring of the repeater (R1, R2, R3) to correspond to the repeater plan. The invention also relates to a network management system in which the method of the invention can be applied. In addition, the invention relates to a repeater, which can be utilized in the method and system of the invention.

Abstract: For improving data transmission over the radio path between a mobile station and a base station in a mobile telecommunications system, a divider splits a data signal whose speed is higher than the maximum data transfer rate in one frame, into at least two signals of lower speed before transmission over the radio path. The mobile station is allocated at least two traffic channels for the high-speed data transmission so that each of the signals of lower speed is transmitted over the radio path in its respective traffic channel. A combiner combines the signals of lower speed received over the radio path, to reconstitute the original signal at the receiving end.

Abstract: The invention relates to a data transmission method and equipment in a telecommunication system, particularly in a situation where the maximum data rate of a traffic channel is equal to one user data rate at a terminal interface. A mobile station inserts terminal interface status information in redundant parts of redundant user data elements of an end-to-end transmission protocol and sends them through the traffic channel without that the status information raises the data rate. If no user data elements are received at the terminal interface, auxiliary frames, in which the terminal interface status information can be transmitted, are generated. A mobile services switching centre separates the terminal interface status information from the redundant data elements or auxiliary frames at the receiving end.

Abstract: A method of determining a grade of service provided for a mobile station by a mobile telephone system including a network part, a mobile station and a bi-directional radio link between the network part and the mobile station. The method comprises the network part assigning a service class for the mobile station based on a grade of service guaranteed by the mobile telephone system to the mobile station and conditions of the mobile telephone system. The conditions comprise transmission capacity and at least one other preselected variable representing features of the mobile telephone system and its use.

Abstract: The invention relates to a mobile system in which the radio interface rate of a traffic channel and the intermediate rate of a transmission channel restrict the number of bits available for the transmission of terminal interface statuses (S), network independent clocking (N) and subchannel numbering (#) of a multichannel data link. In the invention, the bits form a subframe (n, . . . , n+10) and the status and control information are multiplexed inside successive subframes in a superframe structure (SUPERFRAME). In other words, the capacity of the bits available for the control information is shared by various kinds of control information by means of the superframe structure.

Abstract: A system and method for synchronizing variable bit rate traffic between a source and destination in an Asynchronous Transfer Mode (ATM) network. The method includes designating a variable bit rate ATM Adaptation Layer (AAL) protocol to define ATM cell traffic flow from the source to the destination. A synchronous residual timestamp (SRTS) value indicative of the timing of a source clocking function is encoded and transmitted with an ATM cell using a variable bit rate AAL, such as AAL2 or AAL5. The ATM cells and associated SRTS values are received and decoded at the destination ATM interface, and the destination clock is synchronized with the source clock by modifying the destination clock according to the SRTS values.

Abstract: A method of directional radio communication between a first station (BTS4) and a second station (MS) comprises the following steps. A plurality of consecutive signals are received at the first station (BTS4) from the second station (MS). The signals are each receivable from at least one of a plurality of different directions. For each of a plurality of sequential signals which are received by the first station (BTS4) from the second station (MS) the value of at least one parameter is determined. The value of at least one parameter is selected for a signal to be transmitted from the first station (BTS4) to the second station (MS), the value of the at least one parameter of the signal to be transmitted by the first station (BTS4) being selected in dependence on the determined values of the at least one parameter of the plurality of sequential signals.

Abstract: A digital mobile communication network and a switching system for a digital mobile communication network are provided. A traffic frame may include speech signals converted into a parameter group by a speech encoder and, as a whole, may be inserted into a payload part of a data packet. The data packet can be sent to a destination via a transmission network. At the destination, the traffic frame is separated from the payload of the received data packet and the traffic frame is passed to a transcoder unit for restoring the original speech signal. The transmission network can be an asynchronous transfer mode network and the data packet can be an asynchronous transfer mode cell.

Abstract: A method and system supports multilevel QoS (Quality of Service) in transferring a plurality of packets from a local peer entity to a remote peer entity of a communication system, such as a mobile environment using AAL2. During AAL2 Negotiation Procedures (ANP), QoS requirement of each user is obtained either from the user or a computed based on the call setup and is recorded in a ANP memory. After a successful call request negotiation and after a corresponding packet is received by a AAL2 service module, the packet's QoS recorded in the memory is checked. Based on the QoS, the packet is placed into a queue of the AAL2 service module with the same QoS such that a plurality of packets having the same QoS are grouped into the same queue. The packets are transferred from the local peer entity to the remote peer entity based on different QoS requirements.