Link adaptation of a broadcast system
First Claim
1. A method of link adaptation of a broadcast system, comprising:
- determining a signal quality threshold;
broadcasting a signal to a plurality of subscriber devices, wherein the signal comprises the signal quality threshold;
receiving an indicator from a subset of the plurality of subscriber devices, wherein the indicator specifies whether a subscriber device received the signal with a measured signal quality that is above or below the signal quality threshold;
estimating a percentage of subscribers that receive the signal having a received signal quality above the signal quality threshold;
selecting a transmission modulation format and coding based on the estimated percentage, wherein the signal is a layered modulation signal, and the selecting the transmission modulation format and coding comprises selecting a desired signal power differential between levels of the layered modulation signal; and
adaptively determining the signal quality threshold based on the estimated percentage.
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Accused Products
Abstract
A method and apparatus of link adaptation of a broadcast system is disclosed. The method includes a base station adaptively determining a signal quality threshold. The base station broadcasts a signal, wherein the signal includes the signal quality threshold. A plurality of subscribers receives the signal, and measure a signal quality. Each of a subset of the plurality of subscribers transmits back to the base station an indicator of whether the received signal has a measured signal quality that is either above or below the signal quality threshold. A percentage of subscribers that receive the signal having a received signal quality above the signal quality threshold is estimated. A transmission modulation format and coding is selected based on the estimated percentage.
15 Citations
23 Claims
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1. A method of link adaptation of a broadcast system, comprising:
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determining a signal quality threshold; broadcasting a signal to a plurality of subscriber devices, wherein the signal comprises the signal quality threshold; receiving an indicator from a subset of the plurality of subscriber devices, wherein the indicator specifies whether a subscriber device received the signal with a measured signal quality that is above or below the signal quality threshold; estimating a percentage of subscribers that receive the signal having a received signal quality above the signal quality threshold; selecting a transmission modulation format and coding based on the estimated percentage, wherein the signal is a layered modulation signal, and the selecting the transmission modulation format and coding comprises selecting a desired signal power differential between levels of the layered modulation signal; and adaptively determining the signal quality threshold based on the estimated percentage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A system for adaptively controlling layered modulation of a multiple base station multicast broadcast service, comprising:
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a base station configured to broadcast a layered modulation signal; a base station controller; and a plurality of subscriber devices, each of the plurality of subscriber devices configured to determine a signal quality of the broadcasted layered modulation signal, and to report the determined signal quality back to the base station, wherein the base station is configured to collect the reported signal qualities over a predetermined period of time, and to report the collected signal qualities to the base station controller, and the base station controller is configured to statistically determine a desired signal power differential between levels of the layered modulation signal based on the collected signal qualities to adjust a percentage of subscribers having a signal quality above a signal quality threshold. - View Dependent Claims (21, 22)
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23. A system, comprising:
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a base station configured to; determine a signal quality threshold; broadcast a signal to a plurality of subscriber devices, the signal including the determined signal quality threshold; receive an indicator from a subset of the plurality of subscriber devices, the indicator specifying whether a subscriber device received the signal with a measured signal quality that is above or below the signal quality threshold; estimate a percentage of subscribers that receive the signal having a received signal quality above the signal quality threshold; select a transmission modulation format and coding based on the estimated percentage, wherein the signal is a layered modulation signal, and the selecting the transmission modulation format and coding comprises selecting a desired signal power differential between levels of the layered modulation signal; and adaptively determine the signal quality threshold based on the estimated percentage.
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Specification