Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Reexamination Certificate
1999-04-14
2001-12-11
Trost, William (Department: 2746)
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
C455S134000, C455S135000, C455S464000, C455S515000, C455S452200
Reexamination Certificate
active
06330429
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a channel grouping system and method for a wireless communications system.
BACKGROUND OF THE INVENTION
In a wireless communications system, an uplink channel between a remote station and a base station has a received signal parameter value (e.g., signal strength) that depends upon the location of the remote station relative to the base station. In a time-division multiplex communications system, multiple uplink channels may be used simultaneously. The dynamic range of a coverage area represents a range from a lowest received signal strength of one channel to a highest received signal strength of another channel. For example, the lowest received signal strength may be a result of a remote station located at a periphery of the coverage area in which a base station is centrally located. The coverage area may be defined in terms of a probability of providing an electromagnetic transmission of at least a target minimum signal strength between a base station and a remote station throughout a cell, or sector thereof.
In a time-division multiplex wireless system, a wide dynamic range within a coverage area may impede the ability of the base station to adjust downlink transmit power transmitted to remote stations. A group of channels may be organized in such a manner as to limit the channels to a constant downlink transmit power, regardless of an uplink signal strengths or locations of the remote stations in the coverage area. However, the inability to adjust downlink transmit power in a time-division multiplex communications system may reduce the traffic capacity of a wireless communications system. Thus, a need exists for enabling downlink power control in coverage areas with potentially wide dynamic ranges of received signal strengths to realize the full potential capacity of a wireless system.
In some applications, a wide dynamic range of signal strength creates stringent isolation requirements in base station receiver circuitry. For example, a receiver may group channels from different frequency groups for input into a common intermediate frequency circuit module. The common intermediate frequency circuit module requires a degree of isolation that generally increases as the dynamic range of received signal strengths within a coverage area increases. Adequate isolation within the module prevents a “loud” channel with a higher signal magnitude from overwhelming and interfering with a “quiet” channel with an appreciably lower signal magnitude. While radio frequency shielding may sometimes provide adequate radio frequency isolation between circuit components, maximum achievable circuit board density may be sacrificed to accommodate metallic forms for shielding. Further, radio frequency shielding may involve burdensome redesigns of the metallic forms and testing of circuit boards after each modification of a circuit board. Thus, a need exists for reducing the radio frequency isolation requirements for receiver circuitry of communication system applications.
SUMMARY OF THE INVENTION
In accordance with the invention, received channels are grouped into channel groups in which each channel group includes channel members with commensurate signal parameter values to enhance base station performance in a wireless communications system. Received signal parameter data (e.g., signal strengths) are measured at a measurement location for electromagnetic transmissions transmitted by remote stations distributed throughout a radio frequency coverage area. A data processing system determines a probabilities of occurrence for corresponding measured signal parameter values at the measurement location. The data processing system assigns a desired number of channel groups of communication channels for the remote stations. The data processing system establishes boundaries of each channel group to achieve an approximately equivalent quality of service for each channel group based on the probabilities and corresponding measured signal parameter values.
In one aspect of the invention, the reception circuitry of a base station is organized to track the organization of the channel groups such that radio frequency isolation requirements are reduced. In another aspect of the invention, a base station is configured with a power control scheme that controls downlink transmit power based upon the channel groups such that each channel group may have a different power level.
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Lucent Technologies - Inc.
Tran Congvan
Trost William
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