Asymmetric adaptive modulation in a wireless communication system
DCFirst Claim
1. A wireless communication system for determining a plurality of uplink modulation schemes and a plurality of downlink modulation schemes for use in a wireless communication system including a base station and a plurality of customer premises equipment (CPE), where each of the plurality of uplink and downlink modulation schemes used by each of the plurality of CPE can be asymmetric, such that the uplink modulation scheme may be different than the downlink modulation scheme, the system comprising:
- a plurality of CPE, each including a first modem configured to measure a first link quality based on received downlink data;
a base station having a second modem configured to measure a second link quality for each of the plurality of CPE based on received uplink data;
a first processor configured to receive the first link quality and determine a downlink modulation scheme for each of the plurality of CPE; and
a second processor configured to receive the second link quality and determine an uplink modulation scheme for each of the plurality of CPE.
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Abstract
On embodiment of the system and method provides asymmetric adaptive modulation which allows uplink and downlink subframes of data to be transmitted between a base station and a CPE with different modulation schemes, thus increasing the efficiency of downlink transmissions while maintaining the stability of uplink transmissions. In systems with multiple CPEs, each CPE and base station pair can independently select their uplink and downlink modulation techniques. The system and method are also adaptive in that they adjust the modulation schemes based on, for example, signal to noise ratio measurements or bit error rate measurements.
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Citations
27 Claims
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1. A wireless communication system for determining a plurality of uplink modulation schemes and a plurality of downlink modulation schemes for use in a wireless communication system including a base station and a plurality of customer premises equipment (CPE), where each of the plurality of uplink and downlink modulation schemes used by each of the plurality of CPE can be asymmetric, such that the uplink modulation scheme may be different than the downlink modulation scheme, the system comprising:
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a plurality of CPE, each including a first modem configured to measure a first link quality based on received downlink data;
a base station having a second modem configured to measure a second link quality for each of the plurality of CPE based on received uplink data;
a first processor configured to receive the first link quality and determine a downlink modulation scheme for each of the plurality of CPE; and
a second processor configured to receive the second link quality and determine an uplink modulation scheme for each of the plurality of CPE. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless communication system for determining an uplink modulation scheme and a downlink modulation scheme for use in a wireless communication system including a base station and at least one customer premises equipment (CPE), wherein the uplink and downlink modulation schemes are independently determined, such that the uplink modulation scheme may be different than the downlink modulation scheme, the system comprising:
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a CPE having a first modem configured to measure a first link quality based on received downlink data, a first processor configured to receive the first link quality and determine a downlink modulation scheme for the CPE; and
a base station having,a second modem configured to measure a second link quality for the CPE based on received uplink data, a second processor configured to receive the second link quality and determine an uplink modulation scheme for the CPE.
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11. A wireless communication system for selecting a plurality of modulation schemes for use with a base station and a plurality of customer premises equipments (CPEs), wherein physical slots in an uplink subframe of data are assigned to the plurality of CPEs by the base station, and wherein the plurality of modulation schemes are used by the plurality of CPEs to modulate data transmitted during the physical slots to the base station, the system comprising:
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a plurality of CPEs, each including a first modem configured to measure a quality value for a first physical slot of a first downlink subframe of data and transmit the quality value during a subsequent first physical slot of a first uplink subframe of data; and
a base station including a second modem configured to receive each quality value from the plurality of CPEs and determine a modulation scheme for a second physical slot of a second downlink subframe of data for each of the plurality of CPEs, wherein the downlink modulation scheme is determined independently of a modulation scheme for a second physical slot of a second uplink subframe of data. - View Dependent Claims (12, 13, 14)
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15. A wireless communication system for determining a first and second uplink modulation scheme and a first and second downlink modulation scheme for use in a wireless communication system including a base station and a first and second customer premises equipment (CPE), wherein the first uplink and downlink modulation schemes may be different, and the second uplink and downlink modulation schemes may be different, the system comprising:
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a first CPE configured to receive data that is modulated using a first downlink modulation scheme by a base station and including a first signal to noise ratio module configured to measure a first downlink quality for the received data, and a first processor configured to determine a revised first downlink modulation scheme based on the first downlink quality;
a second CPE configured to receive data that is modulated using a second downlink modulation scheme by the base station and including a second signal to noise ratio module configured to measure a second downlink quality for the received data, and a second processor configured to determine a revised second downlink modulation scheme based on the second downlink quality;
a base station having a third signal to noise ratio module configured to measure a first uplink quality for the received data from the first CPE and a second uplink quality for the received data from the second CPE, and a third processor configured to determine a first uplink modulation scheme based on the first uplink quality for the first CPE and a second uplink modulation scheme based on the second uplink quality for the second CPE.
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16. A wireless communication system for determining a plurality of uplink modulation schemes and a plurality of downlink modulation schemes for use in a wireless communication system including a base station and a plurality of customer premises equipment (CPE), wherein each of the plurality of uplink and downlink modulation schemes used by each of the plurality of CPEs can be asymmetric, such that the uplink modulation scheme may be different than the downlink modulation scheme, the system comprising:
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a plurality of CPEs, each of the CPE including a first modem configured to measure a first downlink quality for data from a base station; and
a base station having a second modem configured to measure uplink quality for transmissions from each of the plurality of CPEs, and a processor configured to determine an uplink modulation scheme for each of the CPE, wherein the processor is further configured to receive the first downlink quality from the plurality of CPEs and determine a downlink modulation scheme for each CPE. - View Dependent Claims (17, 18)
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19. A method for determining a plurality of uplink modulation schemes and a plurality of downlink modulation schemes for use in a wireless communication system which communicates with frames of data and includes a base station and a plurality of customer premises equipment (CPEs), wherein each of the plurality of uplink and downlink modulation schemes used by each of the plurality of CPEs can be asymmetric, such that the uplink modulation scheme may be different than the downlink modulation scheme, the method comprising:
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determining an uplink quality for a first frame of data transmitted by a CPE and received by a base station;
comparing the determined first uplink quality to a plurality of modulation threshold values;
if the first uplink quality has crossed one of the plurality of modulation thresholds selecting a second uplink modulation scheme for the CPE;
receiving a request for the second uplink modulation scheme at the CPE;
determining a downlink quality for a second frame of data transmitted by the base station and received by the CPE;
comparing the determined first downlink quality to a second plurality of modulation threshold values;
if the first downlink quality has crossed one of the plurality of modulation thresholds, selecting a second downlink modulation scheme for the CPE;
receiving a request for the second downlink modulation scheme at the base station;
transmitting a third frame of data by the base station to the CPE using the second downlink modulation scheme;
transmitting a fourth frame of data by the CPE to the base station using the second uplink modulation scheme. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification