Time division multiple access base station supporting ISDN messages
First Claim
1. An improved base station for use in a time division multiple access communication system said base station of the type having a spread-spectrum transmitter and a spread-spectrum receiver, said transmitter comprising an input port for input data, a chip sequence transmitter generator, modulator and a transmitting antenna, and said receiver comprising a receiver antenna, a chip sequence receiver generator, a demodulator and an output port for output data, wherein the improvement comprises:
- time division multiple access frame circuitry, said frame circuitry generating a repetitive clock signal for use in transmission of signals by said transmitter of said base station and in reception of signals by said receiver of said base station, said repetitive clock signal defining a transmission time interval reserved for a base station transmission in a spread spectrum format comprising generated base-to-user messages including both a first generated data message and a first generated control message, said first generated control message comprising a control message in ISDN format.
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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.
217 Citations
22 Claims
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1. An improved base station for use in a time division multiple access communication system said base station of the type having a spread-spectrum transmitter and a spread-spectrum receiver, said transmitter comprising an input port for input data, a chip sequence transmitter generator, modulator and a transmitting antenna, and said receiver comprising a receiver antenna, a chip sequence receiver generator, a demodulator and an output port for output data, wherein the improvement comprises:
time division multiple access frame circuitry, said frame circuitry generating a repetitive clock signal for use in transmission of signals by said transmitter of said base station and in reception of signals by said receiver of said base station, said repetitive clock signal defining a transmission time interval reserved for a base station transmission in a spread spectrum format comprising generated base-to-user messages including both a first generated data message and a first generated control message, said first generated control message comprising a control message in ISDN format. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for time division multiple access communication comprising
a base station, a plurality of user stations, each of which communicates with said base station in at least one minor time frame during a major time frame, said major time frame comprised of a plurality of minor time frames, said minor time frames comprising a base transmission time period and a user transmission time period, wherein said base station transmits in said base transmission time period to each of said user stations a base-to-user message in a spread spectrum format, said base-to-user message comprising a first field comprising a base station data message and a second field comprising a base station control message, said base station control message comprising a control traffic communication, and wherein each of said user stations transmits in said user transmission time period a user-to-base message in a spread spectrum format, said user-to-base message comprising a third field comprising a user station data message and a fourth field comprising a user station control message.
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12. A method for time division duplex communication comprising the steps of
transmitting over a designated frequency, during each of a plurality of minor time frames in a major time frame, a plurality of spread spectrum base messages from a base station, each spread spectrum base message comprising a base data message and a base control message, said spread spectrum base message directed to a single one of a plurality of user stations, receiving, during a first minor time frame, a first spread spectrum base message at a first user station, transmitting over said designated frequency, during said first minor time frame, a spread spectrum user message from said first user station to said base station, and receiving, during said first minor time frame, said spread spectrum user message at said base station.
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17. An improved user station for use in a time division multiple access communication system said user station of the type having a spread-spectrum transmitter and a spread-spectrum receiver, said transmitter comprising an input port for input data, a chip sequence transmitter generator, modulator and a transmitting antenna, and said receiver comprising a receiver antenna, a chip sequence receiver generator, a demodulator and an output port for output data, wherein the improvement comprises:
time division multiple access frame circuitry, said frame circuitry generating a repetitive clock signal for use in transmission of signals by said transmitter of said user station and in reception of signals by said receiver of said base station, said repetitive clock signal defining a transmission time interval reserved for a base station transmission in a spread spectrum format comprising generated base-to-user messages including both a first generated data message and a first generated control message, said first generated control message comprising a control message in ISDN format. - View Dependent Claims (18, 19, 20, 21, 22)
Specification