Cellular wireless internet access system using spread spectrum and internet protocol
First Claim
1. A cellular wireless internet access system comprising:
- a plurality of portable subscriber terminals each having a directly attached antenna for communicating in a predetermined frequency band with a predetermined nearby cellular base station;
a plurality of cellular base stations each transmitting and receiving in said predetermined frequency band at a single frequency with a predetermined said plurality of said subscriber terminals; and
means for operating said base station on a small frequency allocation obtainable anywhere within the designated frequency band using a single frequency channel of varying bandwidth between 6 and 24 MHz using different spread spectrum transmission chip rates; and
means for operating said base station in a time-division-duplex mode to enable said transmitting and receiving at said single frequency channel thus avoiding the need for separate channels spaced apart for transmit and receive and including means for allocating the ratio of time for transmitting and receiving on a predetermined basis said time division as a function of expected traffic demand;
means for providing high net data rates of 1.5-3.0 Mbps using a plurality of data bearer subchannels on said single frequency channel, orthogonal downlink spreading codes for CDMA transmission, and successive interference cancellation or simultaneous uplink spreading codes.
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Accused Products
Abstract
A cellular wireless internet access system which operates in the 2.5 to 2.68 GHz band and which must comply with complex government regulations on power levels, subscriber equipment and interference levels yet which provides high data rates to users and cell sizes of 1½ miles radius or more from base stations with subscriber equipment and antennas mounted indoors. Such base stations are mounted low and use spread-spectrum transmission to comply with interference rules with respect to adjacent license areas. An unidirectional tear-drop coverage pattern is used at multiple cells to further reduce interference when required. Time division duplex is used to allow the system to operate on any single channel of varying bandwidth within the 2.5 to 2.68 GHz band. Backhaul transmission from base stations to the Internet is provided using base station radio equipment, operating either on a different frequency in the band or on the same frequency using a time-division peer-to-peer technique. Different effective data-rates are provided by a prioritization tiering technique.
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Citations
36 Claims
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1. A cellular wireless internet access system comprising:
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a plurality of portable subscriber terminals each having a directly attached antenna for communicating in a predetermined frequency band with a predetermined nearby cellular base station; a plurality of cellular base stations each transmitting and receiving in said predetermined frequency band at a single frequency with a predetermined said plurality of said subscriber terminals; and means for operating said base station on a small frequency allocation obtainable anywhere within the designated frequency band using a single frequency channel of varying bandwidth between 6 and 24 MHz using different spread spectrum transmission chip rates; and means for operating said base station in a time-division-duplex mode to enable said transmitting and receiving at said single frequency channel thus avoiding the need for separate channels spaced apart for transmit and receive and including means for allocating the ratio of time for transmitting and receiving on a predetermined basis said time division as a function of expected traffic demand; means for providing high net data rates of 1.5-3.0 Mbps using a plurality of data bearer subchannels on said single frequency channel, orthogonal downlink spreading codes for CDMA transmission, and successive interference cancellation or simultaneous uplink spreading codes. - View Dependent Claims (2, 3, 4, 5)
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6. A cellular wireless base station, comprising:
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a transmitter and a receiver for communicating with at least one portable subscriber terminal; and a processor for providing a baseband signal, the baseband signal comprising a plurality of data bearing sub channels and representing a wireless RF signal for transmission by the transmitter in a time-division mode on a single frequency channel, the processor further comprising a bandwidth selector configured to select a radio bandwidth of the single frequency channel, based upon an integer multiple of a first bandwidth, wherein the radio bandwidth selected has a width of the first bandwidth or an integer multiple of the first bandwidth;
wherein;the processor is further operable to inverse multiplex the baseband signal into multiple downlink data bearing signals, and the transmitter is operable to transmit the multiple downlink data bearing signals simultaneously on the single frequency channel in the time-division mode at individual data rates that combine to an aggregate data rate. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for communicating over a cellular wireless network, the method comprising, at a base station:
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selecting a radio bandwidth of a single frequency channel based upon an integer multiple of a first bandwidth, wherein the radio bandwidth selected has a width of the first bandwidth or has a width that is an aggregation of multiples of the width; and communicating on the single frequency channel with at least one portable subscriber terminal using a signal comprising a plurality of data bearing sub channels in a time-division mode, wherein the communicating comprises; inverse multiplexing the signal into multiple downlink data bearing signals; and transmitting the multiple downlink data bearing signals simultaneously in the sub channels at individual data rates that combine to an aggregate data rate. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A portable user equipment (UE), comprising:
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a transmitter and a receiver for communicating with at least one base station; and a processor for receiving a baseband signal, the baseband signal comprising at least one data bearing sub channel and representing a wireless RF signal for transmission by the transmitter in a time-division mode on a single frequency channel, the processor further comprising a bandwidth selector configured to select a radio bandwidth of the single frequency channel based upon an integer multiple of a first bandwidth, wherein the radio bandwidth selected has a width of the first bandwidth or an integer multiple of the first bandwidth and wherein the processor is further operable to inverse multiplex the baseband signal into at least one uplink data bearing signal, and the transmitter is operable to transmit the at least one uplink data bearing signal simultaneously on the single frequency channel in the time-division mode using at least one data rate that combine to an aggregate data rate. - View Dependent Claims (28, 29, 30, 31)
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32. A method for communicating over a cellular wireless network, the method comprising, at a portable user equipment (UE):
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determining a selected radio bandwidth of a single frequency channel based upon an integer multiple of a first bandwidth, wherein the radio bandwidth selected has a width of the first bandwidth or an integer multiple of the first bandwidth; and communicating on the single frequency channel with at least one base station using a signal comprising at least one data bearing sub channel in a time-division mode, wherein the communicating comprises; inverse multiplexing the signal into multiple downlink data bearing signals; and transmitting the multiple downlink data bearing signals simultaneously in the sub channels at individual data rates that combine to an aggregate data rate. - View Dependent Claims (33, 34, 35, 36)
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Specification