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US 2011/0086664 A1Published application
Methods and apparatus for scaling transmit power of signals in wireless communications
AssigneeQUALCOMM Incorporated
InventorsJunyi Li, Saurabh Tavildar, Aleksandar Jovicic, Thomas Richardson
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Abstract
Methods and apparatus of varying transmit power of signals for increasing system throughput and spectral reuse in an unlicensed spectrum are disclosed. One method includes transmitting from a first mobile device to a second mobile device a request to send (RTS) signal having a first transmit data power level based on a channel gain between the first mobile device and the second mobile device, receiving, at the first mobile device, a clear to send (CTS) signal from the second mobile device, and transmitting data at the first transmit data power level from the first mobile device to the second mobile device.
Claims28
A method of increasing system throughput in an unlicensed spectrum comprising:
- transmitting from a first mobile device to a second mobile device a first request to send (RTS) signal having a first transmit data power level based on a channel gain between the first mobile device and the second mobile device;
- receiving, at the first mobile device, a first clear to send (CTS) signal from the second mobile device;
- and
- transmitting data at the first transmit data power level from the first mobile device to the second mobile device
- wherein the first RTS signal includes a rate option.
2 more elements
A method of increasing system throughput in an unlicensed spectrum comprising:
- transmitting from a first mobile device to a second mobile device a first request to send (RTS) signal having a first transmit data power level based on a channel gain between the first mobile device and the second mobile device;
- receiving, at the first mobile device, a first clear to send (CTS) signal from the second mobile device;
- and
- transmitting data at the first transmit data power level from the first mobile device to the second mobile device
- wherein;
- the second mobile device receives the first RTS signal having a first received RTS power level,
- the second mobile device transmits the first CTS signal having a first transmit CTS power level that is a function of the first received RTS power level, and
- the function is selected from a group consisting of;
- inversely proportional to the first received RTS power level, monotonically decreasing with the first received RTS power level, and monotonically increasing with a rate option.
6 more elements
A method of increasing system throughput in an unlicensed spectrum comprising:
- transmitting from a first mobile device to a second mobile device a first request to send (RTS) signal having a first transmit data power level based on a channel gain between the first mobile device and the second mobile device;
- receiving, at the first mobile device, a first clear to send (CTS) signal from the second mobile device;
- and
- transmitting data at the first transmit data power level from the first mobile device to the second mobile device
- receiving, at a third mobile device, the first RTS signal from the first mobile device having a second received RTS power level;
- receiving, at the third mobile device, a second RTS signal from a fourth mobile device having a third received RTS power level;
- and
- determining, at the third mobile device, whether to transmit a second CTS signal to the fourth mobile device based on a predetermined function of the second received RTS power level and the third received RTS power level.
- wherein;
- the second RTS signal includes a rate option, and
- the predetermined function of the second received RTS power level and the third received RTS power level depends on the rate option.
8 more elements
An apparatus for increasing system throughput in an unlicensed spectrum comprising:
- a transmitter adapted to:
- transmit from a first mobile device to a second mobile device a first request to send (RTS) signal having a first transmit data power level based on a channel gain between the first mobile device and the second mobile device;
- and
- transmit data at the first transmit data power level from the first mobile device to the second mobile device
- a receiver adapted to:
- receive, at the first mobile device, a first clear to send (CTS) signal from the second mobile device;
- wherein the first RTS signal includes a rate option.
4 more elements
An apparatus for increasing system throughput in an unlicensed spectrum comprising:
- a transmitter adapted to:
- transmit from a first mobile device to a second mobile device a first request to send (RTS) signal having a first transmit data power level based on a channel gain between the first mobile device and the second mobile device;
- and
- transmit data at the first transmit data power level from the first mobile device to the second mobile device;
- and
- a receiver adapted to:
- receive, at the first mobile device, a first clear to send (CTS) signal from the second mobile device;
- and
- wherein;
- the second mobile device receives the first RTS signal having a first received RTS power level,
- the second mobile device transmits the first CTS signal having a first transmit CTS power level that is a function of the first received RTS power level, and
- the function is selected from a group consisting of;
- inversely proportional to the first received RTS power level, monotonically decreasing with the first received RTS power level, and monotonically increasing with a rate option.
10 more elements
A apparatus for increasing system throughput in an unlicensed spectrum comprising:
- a transmitter adapted to:
- transmit from a first mobile device to a second mobile device a first request to send (RTS) signal having a first transmit data power level based on a channel gain between the first mobile device and the second mobile device;
- transmit data at the first transmit data power level from the first mobile device to the second mobile device;
- and
- a first receiver adapted to:
- receive, at the first mobile device, a first clear to send (CTS) signal from the second mobile device;
- and
- a second receiver adapted to:
- receive, at a third mobile device, the first RTS signal from the first mobile device having a second received RTS power level;
- receive, at the third mobile device, a second RTS signal from a fourth mobile device having a third received RTS power level;
- and
- a processor adapted to:
- determine, at the third mobile device, whether to transmit a second CTS signal to the fourth mobile device based on a predetermined function of the second received RTS power level and the third received RTS power level.
- wherein;
- the second RTS signal includes a rate option, and
- the predetermined function of the second received RTS power level and the third received RTS power level depends on the rate option.
13 more elements
An apparatus for increasing system throughput in an unlicensed spectrum comprising:
- means for transmitting from a first mobile device to a second mobile device a first request to send (RTS) signal having a first transmit data power level based on a channel gain between the first mobile device and the second mobile device;
- means for receiving, at the first mobile device, a first clear to send (CTS) signal from the second mobile device;
- and
- means for transmitting data at the first transmit data power level from the first mobile device to the second mobile device
- wherein the first RTS signal includes a rate option.
2 more elements
An apparatus for increasing system throughput in an unlicensed spectrum comprising:
- means for transmitting from a first mobile device to a second mobile device a first request to send (RTS) signal having a first transmit data power level based on a channel gain between the first mobile device and the second mobile device;
- means for receiving, at the first mobile device, a first clear to send (CTS) signal from the second mobile device;
- and
- means for transmitting data at the first transmit data power level from the first mobile device to the second mobile device
- wherein;
- the second mobile device receives the first RTS signal having a first received RTS power level,
- the second mobile device transmits the first CTS signal having a first transmit CTS power level that is a function of the first received RTS power level, and
- the function is selected from a group consisting of;
- inversely proportional to the first received RTS power level, monotonically decreasing with the first received RTS power level, and monotonically increasing with a rate option.
6 more elements
A apparatus for increasing system throughput in an unlicensed spectrum comprising:
- means for transmitting from a first mobile device to a second mobile device a first request to send (RTS) signal having a first transmit data power level based on a channel gain between the first mobile device and the second mobile device;
- means for receiving, at the first mobile device, a first clear to send (CTS) signal from the second mobile device;
- and
- means for transmitting data at the first transmit data power level from the first mobile device to the second mobile device
- means for receiving, at a third mobile device, the first RTS signal from the first mobile device having a second received RTS power level;
- means for receiving, at the third mobile device, a second RTS signal from a fourth mobile device having a third received RTS power level;
- and
- means for determining, at the third mobile device, whether to transmit a second CTS signal to the fourth mobile device based on a predetermined function of the second received RTS power level and the third received RTS power level.
- wherein;
- the second RTS signal includes a rate option, and
- the predetermined function of the second received RTS power level and the third received RTS power level depends on the rate option.
8 more elements
A computer program recorded on a tangible medium having instructions for increasing system throughput in an unlicensed spectrum comprising:
- instructions for transmitting from a first mobile device to a second mobile device a first request to send (RTS) signal having a first transmit data power level based on a channel gain between the first mobile device and the second mobile device;
- instructions for receiving, at the first mobile device, a first clear to send (CTS) signal from the second mobile device;
- and
- instructions for transmitting data at the first transmit data power level from the first mobile device to the second mobile device
- wherein the first RTS signal includes a rate option.
2 more elements
Dependencies are inferred from the claim text.