Method for selecting a combination of modulation and channel coding schemes in a digital communication system
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsH.ang.kan Gunnar Olofsson, Jorn Thielecke
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Abstract
A communication system that supports multiple modulation and channel coding schemes selects an optimum RF link by measuring link quality parameters, such as C/I ratio. All of the available RF links are characterized based on the measured link quality parameters by calculating mean values and variances of the parameters. Based on the characterization of the RF link, user quality values, such as user data throughput and speech quality values, are estimated. The communication system selects the RF link that provides the best user quality value.
Claims41
In a communication system, a method for selecting a combination of modulation and channel coding scheme from a plurality of combinations of modulation and channel coding schemes comprising the steps of:
- measuring at least one link quality parameter of an RF link;
- calculating at least one channel characteristic measure based on the measured at least one link quality parameter;
- estimating user quality values for each one of the combinations of modulation and channel coding schemes based on the calculated channel characteristic measure;
- and
- selecting a combination of modulation and channel coding schemes on an RF link that provides the best user quality value.
In a communication system, a method for selecting a combination of modulation and channel coding schemes from a plurality of combinations of modulation and channel coding schemes comprising the steps of:
- communicating data using a non-transparent service over an RF link;
- measuring at least one link quality parameter of the RF link;
- calculating at least one channel characteristic measure based on the at least one measured link quality parameter;
- estimating user data throughput for each combination of modulation and channel coding schemes based on the calculated channel characteristic;
- and
- selecting a combination of modulation and channel coding schemes of the RF link from the plurality of combinations of modulation and channel coding schemes that provides the best user data throughput.
A communication system that communicates over RF links that support different combinations of modulation and channel coding schemes comprising:
- means for measuring at least one link quality parameter of an RF link;
- means for calculating at least one channel characteristic measure based on the measured at least one link quality parameter;
- means for estimating user quality values based on the calculated channel characteristic and the corresponding combinations of the modulation and channel coding schemes;
- and
- means for selecting a combination of modulation and channel coding schemes on an RF link that provides the best user quality value.
In a communication system that provides for communication between a mobile station and a base station over uplink and downlink RF links, a method for selecting a combination of modulation and channel coding schemes from a plurality of combinations of modulation and channel coding schemes comprising the steps of:
- measuring at least one link quality parameter of an RF link at the base station;
- calculating at least one channel characteristic measure based on the measured link quality parameter at the base station;
- estimating user quality values for each one of the combinations of modulation and channel coding schemes based on the calculated channel characteristic and the corresponding combinations of the modulation and channel coding scheme supported at the base station;
- and
- selecting a combination of modulation and channel coding schemes on the RF link that provides the best user quality value.
In a communication system that provides for communication between a mobile station and a base station over uplink and downlink RF links, a method for selecting a combination of modulation and channel coding schemes from a plurality of combinations of modulation and channel coding schemes comprising the steps of:
- measuring at least one link quality parameter of an RF link at the mobile station;
- calculating at least one channel characteristic measure based on the at least one measured link quality parameter at the mobile station;
- reporting the calculated channel characteristic measure to the base station;
- estimating user quality values for each one of the combinations of modulation and channel coding schemes based on the calculated channel characteristic and the corresponding combinations of the modulation and channel coding scheme supported at the base station;
- and
- selecting a combination of modulation and channel coding schemes on the RF link that provides the best user quality value.
In a communication system that provides for communication between a mobile station and a base station over uplink and downlink RF links, a method for selecting a combination of modulation and channel coding schemes from a plurality of combinations of modulation and channel coding schemes comprising the steps of:
- measuring at least one link quality parameter of an RF link at the mobile station;
- calculating at least one channel characteristic measure based on the at least one measured link quality parameter at the mobile station;
- estimating user quality values for each one of the combinations of modulation and channel coding schemes based on the calculated channel characteristic and the corresponding combinations of the modulation and channel coding scheme supported at the base station;
- and
- selecting a combination of modulation and channel coding schemes on the RF link that provides the best user quality value.
Dependencies are inferred from the claim text.