SYSTEM AND METHOD FOR CONTENTION BASED TONES IN A MULTIPOINT-TO-POINT ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM
First Claim
1. A system comprising:
- a first remote unit for communicating with a multipoint-to-point host unit using an orthogonal frequency division multiplexing waveform comprising a plurality of orthogonal carriers modulated using an inverse Fourier transform, the first remote unit programmed to transmit at least one symbol representing a request for bandwidth allocation on a first carrier of the plurality of orthogonal carriers; and
a second remote unit for communicating with the multipoint-to-point host unit using an orthogonal frequency division multiplexing waveform comprising a plurality of orthogonal carriers modulated using an inverse Fourier transform, the second remote unit programmed to transmit at least one symbol representing a request for bandwidth allocation on the first carrier of the plurality of orthogonal carriers;
wherein the second remote unit is further programmed to determine when a collision has occurred on the first carrier of the plurality of orthogonal carriers between transmissions from the first remote unit and transmissions from the second remote unit.
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Accused Products
Abstract
Systems and methods for round-trip-delay adjustment in a multipoint-to-point orthogonal frequency division multiplexing (OFDM) system are provided. In one embodiment, a method for a remote unit to request bandwidth in an Orthogonal Frequency Division Multiplexing (OFDM) multi-point to point system comprises: transmitting a signal from a remote unit having a request for bandwidth to a host unit on a first tone, the signal from the remote unit configured to combine with a signal from at least one other remote unit on a different tone to form a coherent OFDM waveform; determining when a collision has occurred on the first tone between the signal transmitted by the remote unit and a signal from at least one other remote unit; and when a collision occurs, re-transmitting the request for bandwidth on the first tone.
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Citations
13 Claims
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1. A system comprising:
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a first remote unit for communicating with a multipoint-to-point host unit using an orthogonal frequency division multiplexing waveform comprising a plurality of orthogonal carriers modulated using an inverse Fourier transform, the first remote unit programmed to transmit at least one symbol representing a request for bandwidth allocation on a first carrier of the plurality of orthogonal carriers; and a second remote unit for communicating with the multipoint-to-point host unit using an orthogonal frequency division multiplexing waveform comprising a plurality of orthogonal carriers modulated using an inverse Fourier transform, the second remote unit programmed to transmit at least one symbol representing a request for bandwidth allocation on the first carrier of the plurality of orthogonal carriers; wherein the second remote unit is further programmed to determine when a collision has occurred on the first carrier of the plurality of orthogonal carriers between transmissions from the first remote unit and transmissions from the second remote unit. - View Dependent Claims (2, 3, 4)
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5. A method for an orthogonal frequency division multiplexing multipoint-to-point communications system, the method comprising:
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establishing communication between a first remote unit of a plurality of remote units and a host unit, the plurality of remote units communicatively coupled to the host unit in a multipoint-to-point configuration; transmitting up to a plurality of tones from the first remote unit, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing; determining when bandwidth is needed for an upstream transmission to the host unit from the first remote unit; transmitting a request for bandwidth to the host unit from the first remote unit on a first tone of the plurality of tones, the request for bandwidth from the first remote unit configured to combine with a signal from at least one other remote unit on a different tone to form a coherent OFDM waveform; and determining when a collision has occurred on the first tone between the request for bandwidth transmitted by the first remote unit and a signal from at least one other remote unit. - View Dependent Claims (6, 7, 8, 9)
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10. A method for a remote unit to request bandwidth in an Orthogonal Frequency Division Multiplexing (OFDM) multi-point to point system, the method comprising:
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transmitting a signal from a remote unit having a request for bandwidth to a host unit on a first tone, the signal from the remote unit configured to combine with a signal from at least one other remote unit on a different tone to form a coherent OFDM waveform; determining when a collision has occurred on the first tone between the signal transmitted by the remote unit and a signal from at least one other remote unit; and when a collision occurs, re-transmitting the request for bandwidth on the first tone. - View Dependent Claims (11, 12, 13)
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Specification