Code division multiple access (CDMA) communication system
First Claim
1. A subscriber unit for use in a multiple access spread-spectrum communication system, the subscriber unit comprising:
- a spread spectrum radio interface, responsive to a rate function signal from a base station, wherein the base station assigns the rate function ones of a plurality of spread-spectrum message channels;
a first despreading means for recovering a respective information signal and modifying signal from a first one of the spread spectrum message channels; and
information channel mode modification means responsive to the rate function signal for reassigning an output of the first despreading means to a second despreading means which supports the different information signal rate, the second despreading means corresponding to a second spread spectrum message channel, whereby the subscriber unit has a capability of communicating by dynamically changing a transmission rate of an information signal transmitted to a subscriber through a first spread-spectrum message channel of the plurality of spread spectrum message channels.
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Abstract
A subscriber unit for use in a multiple access spread-spectrum communication system includes a spread spectrum radio interface, responsive to a rate function signal from a base station, and first and second despreaders. The base station assigns the rate function spread-spectrum message channels and the first despreader recovers and modifies an information signal one of the spread spectrum message channels. The information channel mode is then modified for processing by the second despreader, with the second despreader supporting a different information signal rate. The subscriber unit has a capability of communicating with a dynamically changing a transmission rate of an information signal which includes multiple spread spectrum message channels. The system includes a closed loop power control system for maintaining a minimum system transmit power level for a radio carrier station and the subscriber units, and system capacity management for maintaining a maximum number of active subscriber units for improved system performance.
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Citations
19 Claims
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1. A subscriber unit for use in a multiple access spread-spectrum communication system, the subscriber unit comprising:
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a spread spectrum radio interface, responsive to a rate function signal from a base station, wherein the base station assigns the rate function ones of a plurality of spread-spectrum message channels;
a first despreading means for recovering a respective information signal and modifying signal from a first one of the spread spectrum message channels; and
information channel mode modification means responsive to the rate function signal for reassigning an output of the first despreading means to a second despreading means which supports the different information signal rate, the second despreading means corresponding to a second spread spectrum message channel, whereby the subscriber unit has a capability of communicating by dynamically changing a transmission rate of an information signal transmitted to a subscriber through a first spread-spectrum message channel of the plurality of spread spectrum message channels. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A subscriber unit for use in a multiple access spread-spectrum communication system, the subscriber unit capable of communicating by dynamically changing a transmission rate of an information signal transmitted to a subscriber through a first spread-spectrum message channel of a plurality of spread spectrum message channels, the subscriber unit comprising:
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a spread spectrum radio interface, responsive to a rate function signal from a base station, wherein the base station assigns the rate function ones of the plurality of spread-spectrum message channels;
a first despreading circuit, the first despreading circuit capable of recovering the respective information signal and modifying signal from the first spread spectrum message channel; and
an information channel mode modification circuit responsive to the rate function signal for reassigning an output of the first despreading circuit to a second despreading circuit which supports the different information signal rate, the second despreading circuit corresponding to a second spread spectrum message channel. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A subscriber unit for use in a multiple access spread-spectrum communication system, in which a transmission rate of an information signal transmitted to a subscriber corresponding to the subscriber unit has a dynamically changed transmission rate, the subscriber unit comprising:
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synchronization circuitry capable of synchronizing a message according to sequential sub-epoch boundaries of the plurality of spread spectrum message channels; and
a spread spectrum radio interface capable of sending the information signal through the first spread spectrum message channel prior to one of the sub-epoch boundaries and sending the information signal through the second spread spectrum message channel to the substantial exclusion of the first spread spectrum message channel subsequent to the sub-epoch boundary. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification