Spread spectrum transmitter power control method and system
DCFirst Claim
1. A method for controlling transmission power of a first transceiver in communicating information signals of a first user using spread spectrum communication signals within a first frequency band to a second transceiver, and said first transceiver is further for extracting information signals of a second user communicated to said first transceiver by said second transceiver also using spread spectrum communication signals in a second frequency band, said method comprising the steps of:
- determining combined signal power of all signals received by said first transceiver within said second frequency band;
controlling signal power of said first transceiver transmitted spread spectrum communication signals in inverse proportion to variations in said determined combined signal power; and
controlling signal power of said first transceiver transmitted spread spectrum communication signals in inverse proportion to variations in signal power of first transceiver transmitted spread spectrum communication signals as received by said second transceiver.
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Abstract
A power control system for a cellular mobile telephone system in which system users communicate information signals between one another via at least one cell site using code division multiple access spread spectrum communication signals. The power control system controls transmission signal power for each cellular mobile telephone in the cellular mobile telephone system wherein each cellular mobile telephone has an antenna, transmitter and receiver and each cell-site also has an antenna, transmitter and receiver. Cell-site transmitted signal power is measured as received at the mobile unit. Transmitter power is adjusted at the mobile unit in an opposite manner with respect to increases and decreases in received signal power. A power control feedback scheme may also be utilized. At the cell-site communicating with the mobile unit, the mobile unit transmitted power is measured as received at the cell-site. A command signal is generated at the cell-site and transmitted to the mobile unit for further adjusting mobile unit transmitter power corresponding to deviations in the cell site received signal power. The feedback scheme is used to further adjust the mobile unit transmitter power so as to arrive at the cell-site at a desired power level.
418 Citations
30 Claims
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1. A method for controlling transmission power of a first transceiver in communicating information signals of a first user using spread spectrum communication signals within a first frequency band to a second transceiver, and said first transceiver is further for extracting information signals of a second user communicated to said first transceiver by said second transceiver also using spread spectrum communication signals in a second frequency band, said method comprising the steps of:
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determining combined signal power of all signals received by said first transceiver within said second frequency band; controlling signal power of said first transceiver transmitted spread spectrum communication signals in inverse proportion to variations in said determined combined signal power; and controlling signal power of said first transceiver transmitted spread spectrum communication signals in inverse proportion to variations in signal power of first transceiver transmitted spread spectrum communication signals as received by said second transceiver. - View Dependent Claims (2, 3, 4, 5, 6)
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7. In a remote station transceiver having a receiver for receiving a base station transmitted outbound spread spectrum signals wherein one of said outbound spread spectrum signals contains first user information and for demodulating said one outbound spread spectrum signal to provide said first user information to a first user, and a transmitter for transmitting to said base station an inbound spread spectrum signal containing second user information, said transceiver having a power control system for controlling at said transceiver the transmission signal power of said inbound spread spectrum signal wherein the signal power of said inbound spread spectrum signal as received at said base station is maintained about a predetermined average signal power level, and wherein said base station measures the signal power of said inbound spread spectrum signal as received at said base station, generates power adjustment commands according to variations in said measured signal power of said inbound spread spectrum signal with respect to said predetermined average signal power level and transmits said power adjustment commands in said one outbound spread spectrum signal, said power control system comprising:
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control processor means coupled to said receiver for receiving from said receiver said power adjustment commands in said one outbound spread spectrum signal, accumulating values corresponding to said power adjustment commands with respect to a predetermined first power level value, and generating a corresponding first power level control signal, said control processor means further for generating a power level set signal; automatic gain control means coupled to said receiver for measuring signal power of all of said outbound spread spectrum signals received by said receiver, and providing a corresponding power measurement signal; comparator means for receiving and comparing said power measurement signal and said power level set signal, and providing a corresponding second power level control signal; and amplification means coupled to said transmitter for receiving said first and second power level control signals and amplifying said inbound spread spectrum signal at a gain level determined by said first and second power level control signals. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for controlling transmission power of a first transceiver in transmitting spread spectrum communication signals, to a second transceiver such that said first transceiver transmitted signals are maintained at a predetermined power level as received at said second transceiver, said second transceiver also transmitting spread spectrum communication signals to said first transceiver, said system comprising:
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first power control means for determining combined signal power of second transceiver transmitted spread spectrum communication signals received by said first transceiver and controlling signal power of said first transceiver transmitted spread spectrum communication signals in inverse proportion to variations in said determined combined signal power; and second power control means for further controlling signal power of said first transceiver transmitted spread spectrum communication signals in inverse proportion to variations in signal power of first transceiver transmitted spread spectrum communication signals received by said second transceiver. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A system for controlling the transmission power of a first remote transceiver of a plurality of remote transceivers, wherein each remote transceiver is for transmitting a spread spectrum communication signal to a base transceiver within a first predetermined frequency band, said base transceiver also transmitting a spread spectrum communication signal to at least said first remote transceiver within a second predetermined frequency band, said system comprising:
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first power control means for determining combined signal power of said base transceiver transmitted spread spectrum communication signal and other signals within said second predetermined frequency band as received at said first transceiver, detecting variations in said first power control means determined signal power with respect to a first predetermined transmit power level, and adjusting signal power of said first transceiver transmitted spread spectrum communication signal in response to said first power control means detected variations; and second power control means for determining signal power of said first transceiver transmitted spread spectrum communication signal as received at said second transceiver, detecting variations in said second power control means determined signal power with respect to a second predetermined transmit power level, adjusting signal power of said first transceiver transmitted spread spectrum communication signal in response to said second power control means detected variations. - View Dependent Claims (28, 29, 30)
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Specification