Abstract: The present invention provides a method and respective entities for avoiding handovers in a ping-pong manner in a communication network. The method comprises comparing, when a handover of a mobile station to a base station is intended, decision criteria of the intended handover with decision criteria of previous handovers of the mobile station to that base station, and deciding on allowing or preventing the intended handover based on the result of the comparison.

Abstract: The present invention provides a method and respective entities for avoiding handovers in a ping-pong manner in a communication network. The method comprises comparing, when a handover of a mobile station to a base station is intended, decision criteria of the intended handover with decision criteria of previous handovers of the mobile station to that base station, and deciding on allowing or preventing the intended handover based on the result of the comparison.

Abstract: Insight and rules are needed for how to handle scheduling in a way meaningful for network operation is explained, such as what transmissions can be delayed for scheduling and which cannot be delayed for scheduling, and how grouped transmissions can be used for interference avoidance. Certain embodiments of the present invention provide a solution to these and other problems. In certain embodiments of the present invention, for example, users are grouped according to criteria which may be indirectly related to interference but are nevertheless different from interference. Thus, for example, certain embodiments of the present invention use expected receive or transmit signal strength or use MCS as grouping criteria.

Abstract: A communications network for transferring communication frames between a base station and a plurality of subscriber stations. Each frame having sets of information and control messages, wherein at least some of the control messages allocate which set of information corresponds to which subscriber station. The overhead of the control messages being reduced.

Abstract: Example embodiments of methods, computer program products, apparatus, and systems for controlling handover of a terminal device are disclosed. In an example system, a terminal device is configured to select a handover target and initiate handover on its own. In the example system, the terminal device is tied to at least one predetermined cell by performing network-sided control of available handover targets.

Abstract: In a communication system in which mobile terminals may roam throughout an area with a plurality of base stations with overlapping coverages and wherein the base stations employ multiplexed slots all in the same frequency range, a system and method for allocating slots based on the quality classes of the transmitted traffic wherein certain slots are assigned as owned by some base stations and certain other slots are assigned as shared between base stations. Slots assigned as owned by a base station are assigned as avoided by adjacent base stations. When assigning a slot for communication from a mobile terminal, the number of slot quality measurements that must be made in order to find a slot with interference below an acceptable level is reduced, compared to conventional dynamic slot allocation schemes.

Abstract: A method includes communicating a number of first frames using a first communication scheme. Each of the first frames has one or more first active time periods. Communication of the first frames uses a first frequency band. The method includes communicating a number of second frames using a second communication scheme. Each of the second frames has one or more second active time periods. Communication of the second frames uses a second frequency band that at least partially overlaps the first frequency band. The communication of the first frames and communication of the second frames operate so that at least a portion of the first and second frames overlap in time but the first and second active time periods do not overlap in time. Apparatus and computer program products are also disclosed. An additional method is disclosed for providing coexistence of two time-division systems.

Abstract: A communications network for transferring communication frames between a base station and a plurality of subscriber stations. Each frame having sets of information and control messages, wherein at least some of the control messages allocate which set of information corresponds to which subscriber station. The overhead of the control messages being reduced.

Abstract: The present invention relates to prioritizing special cells in cell selection in a cellular radio network. In a cellular radio network one or more cells provide a subscriber with special services or tariffs not offered to all subscribers. These cells are called subscriber's special cells. The mobile station measures an average reception level and calculates by means of them cell selection parameters on the basis of which the best cell is selected. In accordance with the invention, when the mobile station detects that the cell is one of cells of a special cell list stored in a memory, it checks first if the cell fulfils a minimum requirement of cell selection on the basis of the measured signal level. If the minimum requirement is fulfilled, the mobile station manipulates the calculation of the cell selection parameter of a special cell to the effect that the selection probability of a special cell is improved with respect to a normal cell.

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: A data transmission method in a system employing information channels having at least two different capacities, on which channels speech is transmitted by at least two different coding techniques in such a manner that on a channel having a higher capacity, fewer symbols to be transmitted are coded from the same speech signal block than on a channel having a lower capacity, includes speech coding, channel coding, dividing the speech signal block, combining parts, adding error correction symbols, adding rail symbols, and convolution coding. It is also possible that the convolution-coded symbols are transmitted as interleaved or that the channel-coded signal is transmitted over the full rate channel. As a result of this method, the cell size of a radio telephone system and thus, the coverage area of the system, is extended without large changes in equipment or without an increase in transmission power.

Abstract: For accomplishing an interference-free handover in a cellular communication system which has at least one base station per cell, which base station is controlled by a base station controller which controls one or more base stations, and which base station controller, with the base station or stations under its control, forms a base station system, the respective service areas of respective base stations under different base station controllers at the border or borders of two or more base station systems are caused to at least partly overlap.

Abstract: In a cellular radio system having in each of a plurality of cells at least one base station communicating with mobile stations located within its area, the base stations each transmit a pilot signal to the mobile stations. At least one of the base stations, transmits to the mobile stations by transmitting a pilot signal by using a rather narrow changing antenna beam. The angle of the greatest gain of the antenna beam is controlled in such a way that the antenna beam sweeps the cell area. The mobile stations can use the pilot signal in the identification of a base station, and as an indicator of a need for handover, without the continuous reception of the pilot signal in the subscriber equipment, and without a need to transmit the pilot signal with a higher transmission power than the other signals.

Abstract: The invention relates to a method for transmitting calls of different priorities in a cellular network which comprises in each cell at least one base station (10) communicating with subscriber terminals (11a-11d, 13) within its area, and in which network the base station transmits power control information to the terminal equipments, which may adjust their transmit power on the basis of the power control messages from the base station, the calls of the network having different levels of priority. In order to ensure the call establishment and the quality of calls with a high priority, the calls with a high priority use a higher transmit power than what is allowed for calls with a lower priority.

Abstract: The base stations of a cellular radio system direct their respective antennas effectively towards the terminal equipment with which they are respectively communicating. Each terminal equipment maintains and updates a list of base stations serving and potentially available to serve the respective terminal equipment. Updating is based on measuring signal strengths and directions, as well as directions of motion of the respective terminal equipment, so that each list, as updated includes only those base stations serving, and on the basis of forecast direction of movement of the terminal equipment, likely to be able to serve the respective terminal equipment. The terminal equipment measure signal strengths for the listed base stations, to determine the need for a handover.

Abstract: Interference in a cellular CDMA network due to mobile stations causing multiple use of one carrier frequency in neighboring cells is cancelled. A hard handover is implemented by defining the phase of a spread spectrum code in a signal transmitted from a base station to a mobile followed by measurement of signal strength in the mobile. Thereafter, the result is reported to the CDMA network, inferring whether the mobile interferes with the base station of the neighboring cells. If interference is present, the surrounding base stations are informed about the mobile station channel used, and this information is taken into account in the receivers of signals transmitted by other mobiles within the cell. The measurement results of the mobile are provided as initial values to the parameters required by the initialization of the interference cancellation routines performed in a neighboring base station.

Abstract: A receiver, and a method for estimating received power in a cellular radio system having in each cell at least one base station communicating with mobile stations within its coverage area. The mobile stations measure strength of the signal received from a base station, and report the measurement results to that base station. To improve power adjustment, a model describing the dynamic behavior of the signal is created for the received power on each connection. The model is utilized for power adjustment, as well as for making handover decisions.

Abstract: Transmission power control of a mobile terminal unit in a cellular telecommunication system, in which: the base station informs the mobile units of its existence on a common control channel in a TDMA slot, at least one control channel is dedicated to the mobile terminals seeking connection, and the power level of the connection-seeking signal is dependent of the measured power level, downlink, from the base station.

Abstract: A mobile station, and a method for eliminating multiple-access interference in a CDMA cellular radio system having a plurality of cells each having at least one base station communicating with mobile stations residing in the respective cell and informing the respective mobile stations of at least one spreading code used in a neighboring cell, the mobile stations measuring the code phase and power level of a channel of the neighboring cell using the known spreading code. To reduce the effect of multiple-access interference, the signal received at the mobile station is utilized in the detection of the desired signal by using the code phase and power level of the measured channel using the known spreading code of the neighboring cell.

Abstract: A rake-type CDMA base station receiver equipment, including a plurality of correlators each having a received signal as its input, a plurality of diversity combiners for respective receiver branches, and a measurer for measuring the quality of the received signal. To reduce the number of correlators and diversity combiners, the receiver equipment further includes switches for switching the correlators to the different combiners, and controllers for controlling the switches on the basis of data sent from the measurer for measuring the quality of the received signal or on the basis of the capacity loading of the base station receiver equipment.