Method and Apparatus for wireless spread spectrum communication with preamble processing period
First Claim
1. A method performed by a user station of a wireless communications network, the method comprising:
- transmitting a spread spectrum control pulse to a base station in a minor frame of a TDMA major frame;
receiving a spread spectrum information signal from the base station, the information signal including a power control command based on the control pulse;
decoding the power control command;
adjusting a transmit power level based on the received power control command;
generating an internal synchronization signal using the power control command; and
decoding the information signal using the internal synchronization signal.
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Accused Products
Abstract
A simple and flexible over-air protocol for use with a mobile telephone system, having hand-held telephones in a microcell or other type of cellular communication system. A method in which user stations communicate with one or more base stations to place and receive telephone calls, in which the user stations are provided a secure voice or data link and have the ability to handoff calls between base stations while such calls are in progress. Each base station has a set of “air channels” to which it transmits in sequence. The air channels supported by each base station are called that base station'"'"'s “polling loop”. A user station receives general polling information on an unoccupied air channel, transmits responsive information to the base station, and awaits acknowledgment from the base station. Each base station may therefore simultaneously maintain communication with as many user stations as there are air channels in its polling loop. The ability of a user station to communicate on any unoccupied air channel makes the protocol air-channel agile, while the stability of user station and base station clocks may define air channels, gaps, and minor frames.
247 Citations
17 Claims
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1. A method performed by a user station of a wireless communications network, the method comprising:
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transmitting a spread spectrum control pulse to a base station in a minor frame of a TDMA major frame;
receiving a spread spectrum information signal from the base station, the information signal including a power control command based on the control pulse;
decoding the power control command;
adjusting a transmit power level based on the received power control command;
generating an internal synchronization signal using the power control command; and
decoding the information signal using the internal synchronization signal. - View Dependent Claims (2, 3, 4, 5)
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6. A user station comprising:
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a spread spectrum transmitter to transmit a spread spectrum control pulse to a base station in a minor frame of a TDMA major frame;
a spread spectrum receiver to receive a spread spectrum information signal from the base station, the information signal including a power control command based on the control pulse;
a digital correlator coupled to the receiver to decode the power control command and generate an internal synchronization signal in response to decoding the power control command; and
a processor coupled to the digital correlator and the transmitter to adjust a transmit power level based on the received power control command, and to decode the information signal using the internal synchronization signal. - View Dependent Claims (7, 8, 9)
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10. A method performed by a base station in a wireless communications network, the method comprising:
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receiving a spread spectrum control pulse from a user station in a minor frame of a TDMA major frame;
detecting the control pulse;
generating an internal synchronization signal using the received control pulse;
measuring the received power of the control pulse;
generating a power control command for the user station based on the measured received power, transmitting a first spread spectrum information signal to the user station including the generated power control command;
receiving a second spread spectrum information signal from the user station; and
decoding the received information signal using the internal synchronization signal. - View Dependent Claims (11, 12, 13)
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14. A base station comprising:
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a spread spectrum receiver to receive a spread spectrum control pulse and a spread spectrum information signal from a user station in a minor frame of a TDMA major frame;
a digital correlator coupled to the receiver to detect the control pulse and to generate an internal synchronization signal in response to detecting the control pulse; and
a processor coupled to the digital correlator to generate a power control command for the user station based on the received control pulse, and to decode the received information signal using the internal synchronization signal. - View Dependent Claims (15, 16, 17)
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Specification