Abstract: A method for deciding on handover in a cellular communication system and a cellular communication system comprising cells (A, B, C, D) and a mobile station (MS1, MS2, MS3) having a connection to at least a first cell providing a certain data transfer rate i.e. a bit rate to the mobile station, wherein the system is arranged to collect bit rate information related to the mobile station and use the bit rate information for deciding on handover of the mobile station from the first cell to a second cell.

Abstract: A handover method in a telecommunication system, the method comprising: clarifying whether a mobile station is in a dual coverage area, and, if the mobile station is in a dual coverage area, making the decision to make a handover from a cell of one radio system to a cell of another radio system and performing the handover.

Abstract: The invention relates to a cellular radio network and a method for increasing traffic carrying capacity in a cellular network. The operating frequency spectrum of the cellular network has been divided in such a way that typically both regular frequencies and super-reuse frequencies are employed in each cell. The regular frequencies use a conventional frequency reuse pattern to provide seamless overall coverage. A very tight frequency reuse pattern is used for the super-reuse frequencies to provide additional capacity.

Abstract: A method of changing connection parameters in a cellular radio system comprising terminals, base stations, and radio network controllers, and where at least one terminal is in a macrodiversity connection wherein at least one diversity branch goes between the serving radio network controller and the terminal through the drift radio network controller and the drift base station, and which further comprises a load control wherein the radio network controller monitors and balances the use of radio resources in the base stations that operate under it, and a call control wherein the serving radio network controller sets and changes the connection parameters of its connections, and being characterized in that it comprises observing that the load control of the drift radio network controller demands a change in the connection parameters of the terminal communicating through the base station that operates under it, and controlling the serving radio network controller to change the connection parameters of said termina

Abstract: The invention relates to a method for processing a traffic channel request in a cellular radio system. To ensure that the allocation of a new traffic channel would not disturb adjacent cells, the method comprises the steps of: calculating the number of traffic channels in use in a radio cell; measuring the quality of ongoing connections of adjacent cells using at least to some extent the same frequency channels as said radio cell; and preventing the traffic channel from being allocated to a mobile station from said radio cell if the number of traffic channels in use exceeds a predetermined threshold value and if in any of said adjacent cells the mean value of quality for ongoing connections is lower than a predetermined minimum quality value.

Abstract: A handover method in a telecommunication system, the method comprising: clarifying whether a mobile station is in a dual coverage area, and, if the mobile station is in a dual coverage area, making the decision to make a handover from a cell of one radio system to a cell of another radio system and performing the handover.

Abstract: A method for deciding on handover in a cellular communication system and a cellular communication system comprising cells (A, B, C, D) and a mobile station (MS1, MS2, MS3) having a connection to at least a first cell providing a certain data transfer rate i.e. a bit rate to the mobile station, wherein the system is arranged to collect bit rate information related to the mobile station and use the bit rate information for deciding on handover of the mobile station from the first cell to a second cell.

Abstract: The invention relates to a handover method in a mobile communication system in which error correction of a radio signal can be arranged with different protection levels. The method comprises measuring the signal level and/or quality of base stations in a mobile station, the signal quality and level of the mobile station at the base station is measured, comparing measurements results thus obtained and other variables of the connection with handover criteria, and handover is performed from the source cell to the target cell, when the handover criteria are met. The invention is characterized by determining at least one handover criterion depending on error correction of the radio connection. The invention further relates to a mobile communication system for performing handover.

Abstract: The present invention relates to a method and an arrangement for determining a hot spot of telephone traffic in a cell. The invention uses simultaneously two basic measurements of digital radio systems; timing advance and adjacent cell measurement. Timing advance informs the distance of the mobile station from the base station but not the direction. On the basis of the measured signal strengths of adjacent cells it is possible to determine a set of possible locations of the mobile station when there is information about the coverage area of individual adjacent cells. When these measurements are used simultaneously, they exclude the inaccuracies of each other and enable very accurate location determination for monitoring traffic distribution.

Abstract: The invention relates to a handover method in a mobile communication system in which error correction of a radio signal can be arranged with different protection levels. The method comprises measuring the signal level and/or quality of neighbouring base stations (BTS) at a receiver of a mobile station (MS), comparing the measurement results thus obtained and other variables of the connection with handover criteria, and performing a handover from the source cell to the target cell, when the pre-set handover criteria are met. The method of the invention is characterized by determining at least one error connection possible for the connection in a potential target cell for the handover, determining at least one handover criterion on the basis of the determined error correction of the potential target cell, and setting the error correction of the connection in the target cell (BTS2) as said error correction of the base station of the target cell.

Abstract: A cellular radio network and a method for increasing traffic carrying capacity in a cellular network in which the operating frequency spectrum of the cellular network has been divided so that typically both regular frequencies and super-reuse frequencies are employed in each cell. The regular frequencies use a conventional frequency reuse pattern to provide seamless overall coverage (overlay). A very tight frequency reuse pattern is used for the super-reuse frequencies to provide additional capacity (underlay). The cellular network controls the division of traffic into regular and super-reuse frequencies by radio resource allocation at the call set-up phase and later on during the call by handover procedure. The cellular network continuously monitors the downlink co-channel interference of each super-reuse frequency in the cell separately for each ongoing call.

Abstract: A handover method and arrangement in which a mobile station measures the reception level and the quality of the signal in the serving cell as well as the level of the signal of adjacent cells. The mobile station transmits the measurement results to a fixed network, which determines the need for handover, and, with the aid of the measurement results, selects at least one adjacent cell as a candidate cell for handover. The handover algorithm has been adapted based on the measurement results to estimate the interference level, such as the C/I ratio, in the candidate cell and select the candidate cell for handover so that the possibility of handover to a cell with a high interference level is diminished. Interference level is also used as a criterion in intra-cell handovers.

Abstract: A traffic control method in a hierarchical mobile communication system which has mobile stations, a microcell network primarily intended to be used by mobile stations of a relatively lower transmitting power class, and a macrocell network which at least partly overlays the microcell network and is primarily intended to be used by mobile stations of a relatively higher transmitting power class to control traffic by a handover so that, apart from measurements of the radio path, the transmitting power class of the mobile station and the cell type of the neighboring cell are also taken into account in the handover decision so that only a neighboring cell of the cell type which the mobile station should primarily use on the basis of its transmitting power class is selected as the target cell for the handover.

Abstract: For providing power control for a mobile station in a mobile communication, in connection with accomplishing a handover of the mobile station from a presently serving cell to a target cell, each cell is assigned a maximum transmitting power level at which mobile stations are allowed to transmit in the cell. The receive level of the downlink signal of the handover target cell is measured at the mobile station prior to the handover, and the transmitting power level of the measured receive level of the downlink signal of the target cell. The mobile station is commanded to use the determined transmitting power level as its initial output power level in the target cell following the handover.