Uplink access request in an OFDM communication environment
First Claim
Patent Images
1. A method of operating a wireless terminal in a wireless communication environment, comprising:
- receiving a downlink signal from a base station;
determining downlink signal timing information from the received signal;
determining an uplink transmission time for an access request signal as a function of the determined downlink timing information;
transmitting a first set of tones during a first time period of an access request interval; and
transmitting a second set of tones during a second time period of said access request interval, said first set of tones being different from said second said of tones, wherein the beginnings of the first time period and the second time period are different and are a function of the determined uplink transmission time.
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Accused Products
Abstract
The claimed subject matter relates to acquiring channel access in a wireless communication environment. A wireless terminal may transmit first and second sets of tones over respective first and second contiguous transmission periods. The first and second tone sets may be disjoint from each other and may each comprise a number of contiguous tones. The terminal may then refrain from transmitting during a third time period in order to receive a grant signal from a base station in response to the access request. The beginnings of the first time period and the second time period may be a function of a determined uplink transmission time.
37 Citations
62 Claims
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1. A method of operating a wireless terminal in a wireless communication environment, comprising:
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receiving a downlink signal from a base station; determining downlink signal timing information from the received signal; determining an uplink transmission time for an access request signal as a function of the determined downlink timing information; transmitting a first set of tones during a first time period of an access request interval; and transmitting a second set of tones during a second time period of said access request interval, said first set of tones being different from said second said of tones, wherein the beginnings of the first time period and the second time period are different and are a function of the determined uplink transmission time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus that facilitates synchronization of a wireless terminal to a base station, comprising:
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a receiver that receives a downlink signal from a base station; a processor that evaluates downlink signal timing information in the received signal and identifies an uplink transmission time for an access request signal as a function of the downlink timing information; and a transmitter that transmits a first set of tones during a first time period of an access request interval and a second set of tones during a second time period of said access request interval, said first set of tones being different from said second said of tones, wherein the beginnings of the first time period and the second time period are different and are a function of the determined uplink transmission time. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus for use in a wireless communication environment, comprising:
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means for receiving a downlink signal from a base station; means for determining downlink signal timing information from the received signal; means for determining an uplink transmission time for an access request signal as a function of the determined downlink timing information; means for transmitting a first set of tones during a first time period of an access request interval; and means for transmitting a second set of tones during a second time period of said access request interval, said first set of tones being different from said second said of tones, wherein the beginnings of the first time period and the second time period are different and are a function of the determined uplink transmission time. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A computer-readable medium having stored thereon computer-readable instructions for controlling a wireless terminal, the computer-readable medium comprising:
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instructions for causing said wireless terminal to receive a downlink signal from a base station; instructions for causing said wireless terminal to determine downlink signal timing information from the received signal; instructions for causing said wireless terminal to determine an uplink transmission time for an access request signal as a function of the determined downlink timing information; instructions for causing said wireless terminal to transmit a first set of tones during a first time period of an access request interval; and instructions for causing said wireless terminal to transmit a second set of tones during a second time period of said access request interval, said first set of tones being different from said second said of tones, wherein the beginnings of the first time period and the second time period are different and are a function of the determined uplink transmission time. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. A processor that executes instructions for controlling a communications device in a wireless communication environment to:
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receive a downlink signal from a base station; determine downlink signal timing information from the received signal; determine an uplink transmission time for an access request signal as a function of the determined downlink timing information; transmit a first set of tones during a first time period of an access request interval; and transmit a second set of tones during a second time period of said access request interval, said first set of tones being different from said second said of tones, wherein the beginnings of the first time period and the second time period are different and are a function of the determined uplink transmission time. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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61. A method of operating a base station to provide channel access to a wireless terminal in a wireless communication environment, comprising:
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receiving a first set of tones and a second set of tones from said wireless terminal during first and second time periods of a channel acquisition time interval, respectively, said first set of tones being different from said second said of tones and said first and second time periods being different; performing a fast-Fourier transform protocol on each received tone set to demodulate a complete access request waveform for each tone set; and transmitting a signal granting access to one or more requested channels. - View Dependent Claims (62)
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Specification