Method and apparatus for providing high speed data communications in a cellular environment
First Claim
1. A method for communicating data between a mobile station and a base station located in a cell in a wireless communication system having a plurality of cells, comprising:
- selecting an encoding rate for a fixed power level transmission of data over a predetermined time interval;
selecting an amount of data for said fixed power level transmission of data over said predetermined time interval;
selecting a modulation format for said fixed power level transmission of data over said predetermined time interval;
encoding and modulating said selected amount of data in accordance with said selected encoding rate and said selected modulation format for the transmission of data, andtransmitting a message comprising an indication of one of the selected encoding rate and the selected modulation format for use in decoding the selected amount of data and transmitting messages comprising a different indication upon encountering changed conditions.
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Abstract
A method and apparatus for transmitting digital data in a cellular environment. Adjacent cells of the cellular system are prevented from simultaneously transmitting data. Because the noise from transmissions of adjacent cells is a primary source of interference, the transmission rate of power limited base stations can be dramatically increased when the noise from adjacent cells is eliminated. The transmissions to each subscriber station are made at a fixed transmission power level. However, the data rate of transmitted signals differs from one subscriber station to another depending the path loss differences. In a first exemplary embodiment, the data rate of transmissions to a subscriber station is determined by selecting an encoding rate for the transmitted signal while holding the symbol rate constant. In a second exemplary embodiment, the data rate of transmissions to a subscriber station is determined by selection a modulation format for the transmitted signal which directly changes the symbol rate of transmission to a subscriber station.
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Citations
13 Claims
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1. A method for communicating data between a mobile station and a base station located in a cell in a wireless communication system having a plurality of cells, comprising:
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selecting an encoding rate for a fixed power level transmission of data over a predetermined time interval; selecting an amount of data for said fixed power level transmission of data over said predetermined time interval; selecting a modulation format for said fixed power level transmission of data over said predetermined time interval; encoding and modulating said selected amount of data in accordance with said selected encoding rate and said selected modulation format for the transmission of data, and transmitting a message comprising an indication of one of the selected encoding rate and the selected modulation format for use in decoding the selected amount of data and transmitting messages comprising a different indication upon encountering changed conditions. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10, 11)
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3. An apparatus for communicating data between a mobile station and a base station located in a cell in a wireless communication system having a plurality of cells, comprising:
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a controller configured to select an encoding rate, to select an amount of data, and to select a modulation format for a fixed power level transmission of data over a predetermined time interval; an encoder configured to encode and a modulator configured to modulate the selected amount of data in accordance with the selected encoding rate and the selected modulation format for said fixed power level transmission of data, and a transmitter configured to transmit a message comprising an indication of one of the selected encoding rate and the selected modulation format for use in decoding the selected amount of data; wherein the transmitter is further configured to transmit messages comprising a different indication upon encountering changed conditions.
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12. An apparatus for communicating data between a mobile station and a base station located in a cell in a wireless communication system having a plurality of cells, comprising:
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means for selecting an encoding rate for a fixed power level transmission of data over a predetermined time interval; means for selecting an amount of data for said fixed power level transmission of data over said predetermined time interval; means for selecting a modulation format for said fixed power level transmission of data over said predetermined time interval; means for encoding and modulating said selected amount of data in accordance with said selected encoding rate and said selected modulation format for the transmission of data, and means for transmitting a message comprising an indication of one of the selected encoding rate and the selected modulation format for use in decoding the selected amount of data; wherein the means for transmitting are configured to transmit messages comprising a different indication upon encountering changed conditions. - View Dependent Claims (13)
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Specification