Abstract: The invention relates to a hardware arrangement and method for keeping the error rate FER of the basic packets included in RTP packets communicated in a packet-switched telecommunication network (11) at a desired level. In the method according to the invention, the number of basic packets to be included in RTP packets is changed according to the frame error rate FER of the last received RTP packets if it either exceeds or drops below a predetermined threshold value.

Abstract: A method is taught for assigning spreading codes to mobile stations located within a cell, as is a CDMA communications system that operates in accordance with the method. The method includes steps of (A) assigning a set of spreading codes for use in a particular cell; (B) determining values of entries in a spreading code performance table (fixed or dynamic) based on a weighted combination of cross-correlation factors between individual ones of the spreading codes of the set of spreading codes, and also based on an auto-correlation factor of individual ones of the spreading codes of the set of spreading codes, within a delay spread range that is typical for the particular cell; and (C) assigning a spreading code from the performance table by selecting a spreading code that will cause a least amount of interference with a sub-set of already assigned spreading codes.

Abstract: The invention relates to dynamically creating talk groups in a communications system. A new dynamic group is created by a user who defines a group definition message in his subscriber station. This group definition message uniquely identifies the new group in the system, and can be distributed to the intended group members using the usual messaging facilities available in the specific communications system. The recipients of the group definition message can store the message in their subscriber stations for subsequent use. Thus, group creation and membership management are handled at user level without interacting with the system. The role of the system is restricted to establishing a means for communication in the group whenever there are users who have activated the group for communication.

Abstract: The invention relates to a method and arrangement whereby the location of a mobile station (MS, 101) operated in a packet-switched (GPRS) connection can be defined. For the duration of the location measurements, the GPRS mobile station is switched to a circuit-switched connection in the cellular network (11). The invention also comprises the transmission of the accurate map data related to the mobile station as WAP pages to the mobile station for display.

Abstract: A packet mode (e.g. IP) group communication service layer is provided on top of a standard mainstream cellular radio network. Conceptually, the group communication layer comprises a pair of basic logical entities, an application bridge and a call processing server (CPS). The bridge and the CPS run group service applications which communicate with group service application(s) in a mobile station MS over the IP connections provided by the radio network. The CPS is responsible for control plane management of group communications. The bridge is responsible for the real-time distribution of VoIP packets to the user terminals according to their group memberships over valid connections programmed by the CPS.

Abstract: A packet mode (e.g. IP) communication service layer is provided on top of a standard mainstream cellular radio network. Conceptually, the communication layer comprises a pair of basic logical entities, an application bridge and a call processing server (CPS). The bridge and the CPS run packet mode communication service applications, which communicate with packet mode communication service application(s) in a mobile station MS over the IP connections provided by the radio network. The CPS is responsible for control plane management of communications. Embedded user-plane signaling is used for connecting call parties for a packet mode speech two-party (one-to-one) communication. Embedded signaling in the user-plane's bearer makes it unnecessary to reserve another bearer for the control plane's signaling, which saves network resources and allows to achieve a short connection setup time.

Abstract: The invention relates to a procedure for ensuring emergency calls in a wireless local loop environment which is based on technology employed in a mobile telephone system and which comprises a telephone exchange (1), an access node (2) connected to the telephone exchange, a terminal device (3) and a base station (4) connected to the telephone exchange via the access node and serving to transmit call signals between the access node and the terminal device, in which the home network (5) of the terminal device is defined by the base station and the associated access node and in which base stations (7) of other networks are disposed in the environment of the local loop, so that the terminal device receives information signals from the surrounding base stations and, based on said information signals, determines the base station it is communicating with, and the emergency call is set up via any base station compatible with the terminal device.

Abstract: The invention concerns a system implementing a wireless subscriber connection and comprising base stations and wireless terminals. The terminal contains functions which may be used for testing the terminal, the subscriber terminal equipment and the connection between them in response to a message which is received via a radio path and which starts the test functions, and which transmit the test results to a radio link. The terminal contains a subscriber line interface circuit (SLIC) with which the subscriber terminal equipment may be connected to the terminal. A connecting line may be used for connecting. Means for generating an alternating voltage may be connected in parallel with the input of the subscriber line interface circuit (SLIC) and the connecting line.

Abstract: The present invention relates to a method for establishing a telecommunication connection from a subscriber station (1, 9) of a radio system forming a wireless subscriber connection to a public switched telephone network (PSTN), in which method a call request is received from the subscriber station.

Abstract: A power detector for detecting the magnitude of a radio frequency (RF) signal comprises a detector transistor (V1) which provides an output signal (DC-OUT) in dependence upon the input RF signal. The detector transistor is biased with a biasing circuit which comprises two transistors (V2,V3) in a feedback loop coupled to the base of the detector transistor (V1). The detector can be used as both current and voltage amplifier. One of the transistors (V3) in the feedback loop provides temperature compensation.

Abstract: A radio frequency transmission circuit comprising a first signal generating means and a second signal generating means, means for modulating one of the first and second signals to produce a modulated signal, and mixer means to combine the other of the first and second signals and the modulated signal to produce an RF output signal. The first signal is controlled by a feed back loop comprising a second mixer having an input from both the first and second signals, whereby fluctuations in the frequency of the second signal are compensated for by adjustment of the first signal so as to maintain the RF output signal at a substantially constant frequency.

Abstract: By the method according to the invention, microphony, i.e. interference voltages caused by vibration, in a circuit including ceramic surface-mounted capacitors is reduced by eliminating the direct-voltage differential (V1 - V2) effective across the capacitors (C30 - C36). The invention also relates to circuit arrangements implementing the method, and it can be advantageously applied to a radio telephone.