Methods and apparatus for multi-carrier communications with variable channel bandwidth
First Claim
Patent Images
1. A cellular base station comprising:
- circuitry configured to transmit a broadcast channel in an orthogonal frequency division multiple access (OFDMA) core-band, wherein the core-band includes an operating center frequency and a first plurality of subcarriers, wherein the core-band is utilized to communicate a primary preamble sufficient to enable radio operations with a mobile station via the core-band, the primary preamble comprising an OFDM symbol corresponding to a particular frequency pattern within the core-band; and
circuitry configured to transmit, after radio operations with the mobile station is established via the core-band, control and data signals to the mobile station using a variable band that includes the first plurality of subcarriers of the core-band and a second plurality of subcarriers of a sideband, and receive, after radio operations with the mobile station is established via the core-band, data signals from the mobile station via the first and second plurality of subcarriers of the variable band.
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Abstract
Methods and apparatus for multi-carrier communication with variable channel bandwidth are disclosed, where the time frame structure and the OFDM symbol structure are invariant and the frequency-domain signal structure is flexible. In one embodiment, a mobile station, upon entering a geographic area, uses a core-band to initiate communication and obtain essential information and subsequently switches to full operating bandwidth of the area for the remainder of the communication. If the mobile station operates in a wide range of bandwidths, the mobile station divides the full range into sub-ranges and adjusts its sampling frequency and its FFT size in each sub-range.
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Citations
26 Claims
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1. A cellular base station comprising:
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circuitry configured to transmit a broadcast channel in an orthogonal frequency division multiple access (OFDMA) core-band, wherein the core-band includes an operating center frequency and a first plurality of subcarriers, wherein the core-band is utilized to communicate a primary preamble sufficient to enable radio operations with a mobile station via the core-band, the primary preamble comprising an OFDM symbol corresponding to a particular frequency pattern within the core-band; and circuitry configured to transmit, after radio operations with the mobile station is established via the core-band, control and data signals to the mobile station using a variable band that includes the first plurality of subcarriers of the core-band and a second plurality of subcarriers of a sideband, and receive, after radio operations with the mobile station is established via the core-band, data signals from the mobile station via the first and second plurality of subcarriers of the variable band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A cellular base station comprising:
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circuitry configured to transmit a broadcast channel in an orthogonal frequency division multiple access (OFDMA) core-band, wherein the core-band includes an operating center frequency and a first plurality of subcarriers, wherein the core-band is utilized to communicate a primary preamble sufficient to enable radio operations with a mobile station via the core-band, the primary preamble comprising a direct sequence in a time domain with a frequency content confined within the core-band; and circuitry configured to transmit, after radio operations with the mobile station is established via the core-band, control and data signals to the mobile station using a variable band that includes the first plurality of subcarriers of the core-band and a second plurality of subcarriers of a sideband, and receive, after radio operations with the mobile station is established via the core-band, data signal from the mobile station via the first and second plurality of subcarriers of the variable band. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A variable bandwidth communication method comprising:
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transmitting a broadcast channel by a cellular base station in an orthogonal frequency division multiple access (OFDMA) core-band, wherein the core-band includes an operating center frequency and a first plurality of subcarriers, wherein the core-band is utilized to communicate a primary preamble sufficient to enable radio operations with a mobile station via the core-band, the primary preamble comprising an OFDM symbol corresponding to a particular frequency pattern within the core-band; transmitting, after radio operations with the mobile station is established via the core-band, control and data signals to the mobile station by the cellular base station using a variable band that includes the first plurality of subcarriers of the core-band and a second plurality of subcarriers of a sideband; and receiving, after radio operations with the mobile station is established via the core-band, data signals from the mobile station via the first and second plurality of subcarriers of the variable band. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A variable bandwidth communication method comprising:
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transmitting a broadcast channel by a cellular base station in an orthogonal frequency division multiple access (OFDMA) core-band, wherein the core-band includes an operating center frequency and a first plurality of subcarriers, wherein the core-band is utilized to communicate a primary preamble sufficient to enable radio operations with a mobile station via the core-band, the primary preamble comprises a direct sequence in a time domain with a frequency content confined within the core-band; transmitting, after radio operations with the mobile station is established via the core-band control and data signals to the mobile station by the cellular base station using a variable band that includes the first plurality of subcarriers of the core-band and a second plurality of subcarriers of a sideband; and receiving, after radio operations with the mobile station is established via the core-band, data signals from the mobile station via the first and second plurality of subcarriers of the variable band. - View Dependent Claims (23, 24, 25, 26)
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Specification