A method of reducing interference within a cellular system (10) by partitioning a designated frequency spectrum within a service coverage area (11, 12, 13, 14, 15, 16, or 17) into a first and at least second spectrum inclusive of the designated frequency spectrum and each with an associated power level. Assignment of communication units to a spectrum and power level are based upon distance from the base site (as determined through signal strength measurements). The spectral content of spectra in adjacent service coverage areas is adjusted to include non-coincidental frequencies.
This invention is directed to a method for allocating a call in a CDMA base station. Whenever the base station receives a report of the change in the transmission power from channel processors, the level of interference affecting neighboring cells by a cell of its own is measured. In addition, when a new call is attempted, upon comparing the measured level of interference with a predetermined reference level (a threshold value) of interference, it is determined whether a call is allowed (i.e, allocated) or not dependent on a distance between the mobile station and the base station.
A method of avoiding near-far interference problems in a cellular ray of navigation signal beacons having selected CDMA or GPS-like navigation signals. The navigation signals from adjacent navigation signal beacons are pulsed so that adjacent navigation signal beacons do not broadcast navigation signals simultaneously and the multiple frequencies are coordinated in a time divisional multiplex manner. In another aspect, the near-far interference problem is avoided by using multiple frequencies in time division multiplexing and coordinating the use of the multiple frequencies and the time division multiplexing to assure avoidance of the near-far interference problem.
Provided is a method and system for performing a handover of a terminal subscriber between sub-cells in a cellular radio network base station. In the method and system, signals from antenna units corresponding to each of the sub-cells are added together to form a combined signal. A signal power of the combined signal and the signal power a signal from a serving sub-cell are measured in a transceiver of the base station. The measurement results are compared. If the signal power of the combined signal is greater than the signal power of the signal from the serving sub-cell, a handover of the terminal subscriber is performed.
A process of assigning frequencies uses propagation loss in a CDMA communication system. A base station measures propagation loss over a channel between the base station and a mobile station. If the measured propagation loss is greater than a certain fixed value, the base station determines that since the mobile station is present in a position distant from the base station, the mobile station may possibly interfere with a base station of another CDMA communication system. The base station assigns a frequency channel which is not adjacent to the frequency band assigned to the other CDMA communication system to the mobile station.
An apparatus, method, and computer program product for assigning communication resources in a beam-hopping cellular communication system. The satellite has a multiple beam antenna that covers a number of cells that is greater than the number of available beams In a preferred embodiment, the method includes the steps of selecting a frequency for each beam, computing a dwell time for each cell based on the traffic estimates for each cell and the number of available beams, and selecting a cell hopping sequence for each beam based on the dwell times and predicted inter-beam interference.
