Abstract: According to the proposed method, the frequency of power control commands transmitted on a power control channel is changed according to the traffic. When the traffic becomes slower in at least one direction due to a DTX state, a slower transfer rate, asymmetric data transfer or for any other reason, the frequency of power control commands is lowered. Both the base station and the personal station may lower the frequency of the commands which they send. An alternative to changing the frequency of power control commands is to change the energy of power control bits. The duration of power control bits must hereby be extended, if a standard bit error ration is desired. If the system is frequency-divided and/or time-divided and uses frequency control command of several bits, the length of the command word may be shortened in addition to or as an alternative to the change in frequency. The power control algorithm may be changed several times during a traffic connection.

Abstract: A method for closed-loop power control between stations in a wireless communication system is described. The method comprises providing a channel between stations, the channel being divided in slots for carrying data symbols. The method further comprises inserting power control symbols carrying information associated with one power control command in at least two slots. In an embodiment, the method may further comprise operating the channel in discontinuous mode of operation.

Abstract: The base station of a cellular radio system is in radio communication with the mobile stations of the cellular radio system by using mutually essentially orthogonal channels. In order to control the use of the channels, said channels are divided into groups with different priorities, so that the base station uses primarily the channel group with the highest priority. Channels belonging to different priority groups are put to use in a selective manner as a response to the loading of the base station.

Abstract: A method and an arrangement are provided for performing a transition from a continuous communication mode (601, 701, 801) into a combined slotted communication mode and measurement mode (602, 802, 803) in a mobile station (402) of a cellular radio system. A set of criteria is provided that are to be observed during the continuous communication mode (601, 701, 801). It is observed, whether at least one of said criteria is fulfilled during the continuous communication mode (601, 701, 801). As a response to the fulfilment of at least one of said criteria during the continuous communication mode, the operation of the mobile station (402) is changed into the combined slotted communication mode and measurement mode (602, 802, 803).

Abstract: A CDMA system transmits from a base station to a plurality of mobile stations or from mobile station to base station on a shared frequency band, each mobile station's data being spread by a different spreading code chosen from a set of orthogonal codes. Each receiver in base station or mobile station correlates for its intended data by despreading the signal using its particular one of the orthogonal codes. Under certain transmission delays, the effects of orthogonality may diminish and another mobile station's signal may cross-correlate with a mobile station's signal. If not all of the orthogonal codes are in use, the present invention determines another selection of orthogonal codes that yields lower cross-correlation under current delay conditions.

Abstract: A two-dimensional optimization between adaptive modulation and coding (AMC) and multi-code transmission targets the best bit rate at which a highest useable modulation and coding scheme (MCS) achieves a maximum allowed number of channelization codes or less. The optimized MCS and number of channelization codes at a best bit rate is communicated from a transmitter to a receiver, possibly also with power information for instance using a transport format combination indicator (TFCI). A user equipment may play the role of carrying out the optimization and signaling the result to the Node B or may instead receive the result as carried out by the Node B or RNC in response to a radio link quality measurement sent from the UE to the Node B.

Abstract: A method and apparatus are provided for implementing a compressed mode of operation in a mobile communication network in which data transmission and reception is ceased so a required measurement can be made, wherein the power level of data transmission is adjusted to a correct power level before a subsequent data transmission is sent. The compressed mode may be implemented using a single frame method, in which control channels and power control commands are sent in the last slots of a single frame. The compressed mode may also be implemented using a double frame method, in which control channels and power control commands are sent in the beginning slots of a second frame. The method is implemented during a hard handover procedure, such as an intersystem handover. The measurement includes an inter-frequency measurement.

Abstract: A connection establishment method for establishing a random access type connection using a random access channel, which is used in a radio system having several subscriber terminal equipments (37 to 38) and base stations (33 to 36) where one or more transceiver units (40 to 47) operate, and in which system connection establishment between one of the subscriber terminal equipments (37 to 38) and the base station (33 to 36) is possible when the one subscriber terminal equip nt (37 to 38) is situated in the coverage area of one or more transceiver units (40 to 47) of the base station, where the one subscriber terminal equipment (3 to 38) evaluates the quality of the connections to be established. Starting from a condition in which no connection is established with the one subscriber terminal equipment, the one subscriber terminal equipment (37 to 38) forms a random access type connection to more than one base station transceiver unit (40 to 47) included in one or more base stations (33 to 38).

Abstract: A CDMA system transmits from a base station to a plurality of mobile stations or from mobile station to base station on a shared frequency band, each mobile station's data being spread by a different spreading code chosen from a set of orthogonal codes. Each receiver in base station or mobile station correlates for its intended data by despreading the signal using its particular one of the orthogonal codes. Under certain transmission delays, the effects of orthogonality may diminish and another mobile station's signal may cross-correlate with a mobile station's signal. If not all of the orthogonal codes are in use, the present invention determines another selection of orthogonal codes that yields lower cross-correlation under current delay conditions.

Abstract: An apparatus and corresponding method for deciding whether to perform link adaptation for communication transmitted from a first communication device to a second communication device, where the second communication device examines a signal received from the first communication device and provides a first indication of the quality of the signal. The method includes the steps of: recording at least one first indication of the quality of the signal as received by the second communication device; providing a second indication of the quality of the signal based on the at least one first indication of the quality of the signal; and deciding to perform link adaptation based on the second indication of the quality of the signal. The first indication of the quality of the signal is for example a signal to interference ratio (SIR) estimate. Often, the second indication of the quality of the signal is either a changed SIR target value.

Abstract: The invention relates to a radio system and a method of timing an interfrequency handover in a WCDMA cellular radio system where data transmission between a terminal equipment and a base station employs several adjacent alternative frequency bands, and which comprises several different base stations the coverage areas of which overlap at least partly, the base stations utilizing frequency band groups that differ from one another and that are situated next to one another in the frequency range, in which system a terminal equipment communicates with a first base station on a first frequency band and measures the strength of a first signal it has received from the base station, and wherein the terminal equipment measures the strength of a second signal transmitted by a second base station on a second, adjacent frequency band.

Abstract: A method for minimizing the effect of interference in a radio system including a radio system comprises a measuring means which is adapted to measure the transmission frequency of the power control requests transmitted by a base transceiver station to each subscriber terminal. The radio system comprises an attenuation means which is adapted to alter the attenuation of the signals arriving at the reception band of the base transceiver station and which are transmitted by the subscriber terminal, the transmission frequency of power control requests transmitted to which has exceeded a predefined transmission frequency of power control requests.

Abstract: The invention relates to a method for minimizing the effect of interference in a radio system, and to a radio system. The radio system comprises a measuring means which is adapted to measure the transmission frequency of the power control requests transmitted by a base transceiver station to each subscriber terminal. The radio system comprises an attenuation means which is adapted to alter the attenuation of the signals arriving at the reception band of the base transceiver station and which are transmitted by the subscriber terminal, the transmission frequency of power control requests transmitted to which has exceeded a predefined transmission frequency of power control requests.

Abstract: A cellular radio system comprises base stations and mobile stations. In order to execute handover, there is chosen a group of potential new base stations and estimated the carrier to interference ratio that each potential new base station included in said group could offer. The carrier to interference ratio can be estimated separately for real-time and for non-real-time connections and/or for uplink and downlink connections.

Abstract: The present invention relates to a method for establishing a random access type connection and a subscriber terminal equipment (37 to 38) and a radio system operating in accordance with the method. The subscriber terminal equipment (37 to 38) establishes a connection to several base stations (33 to 36) with the method of the invention. The base stations (33 to 36) are selected before establishing the connection by deducing the quality of the connection by means of pilot signals and both uplink and downlink interferences. The subscriber terminal equipment (37 to 38) has a connection to several base stations (33 to 36) already at the initial stage of the connection.

Abstract: A radio connection is adapted to an environment changing over the connection in a cellular radio system where the radio traffic between the base station and the mobile stations is arranged on a multiple access principle, according to a given frame structure (402). For a given radio connection between the transmitting device and the receiving device, there is reserved a given data transmission capacity in said frame structure. The receiving device measures the connection quality (103) during the connection, and on the bases of the measured connection quality, the size of the data transmission capacity (104, 110) reserved for said connection in said frame structure is changed.

Abstract: A cellular radio system and a handover method in a cellular radio system is provided. The cellular radio system includes a subscriber terminal and a base station. In the system, the subscriber terminal maintains and continuously updates an active set of base stations. One or several base stations belonging to the active set has a connection or connection set-up facilities to the subscriber terminal. The subscriber terminal controls the downlink transmission of one or several base stations of the active set by switching the transmission of the base station on or off. This method provides a fast soft handover similar to a hard handover.

Abstract: A method for estimating the quality of a connection in a cellular radio system, and a receiver of a cellular radio system, utilizing comparison circuitry for estimating, by use of received pilot signals and received combined broadband signal the interference caused by base stations at the terminal equipment. The method may be utilized e.g. for distributing the traffic load of the base stations and in interference cancellation methods.

Abstract: The invention relates to a method for improving the reliability of a handover and call establishment in a cellular radio system which comprises at least one base station in each cell, and a group of subscriber terminal equipments which communicate with one or more base stations. The base stations measure the total interference level of signals they have received from the terminal equipments, and transmit a pilot signal with a known transmit power. The terminal equipments measure the power levels of pilot signals received from different base stations. In the system at least some transceivers comprise circuitry for estimating, by means of the pilot signals, the path loss between the terminal equipment and the base stations.