Method and system for link adaptation using metric feedback
First Claim
1. A method for link adaptation at a base station using metric feedback, comprising:
- communicating with a mobile station over a communication link having one or more sub-channels;
during the communication, receiving an index transmitted from the mobile station corresponding to a plurality of mutual information per coded bit metrics for a plurality of candidate modulation types per coding layer, wherein the mutual information per coded bit metrics are based on channel state knowledge of the sub-channels, wherein the index is based on a predetermined table known to both the base station and the mobile station, and wherein the predetermined table is defined based on joint probability distribution of the plurality of mutual information per coded bit metrics and coding rate constraints for each candidate modulation type per coding layer;
based on the received index, predicting operational performance of the mobile station in view of one or more transmission parameters and one or more performance factors; and
selecting one or more of the transmission parameters, including a modulation type selected from one of the plurality of candidate modulation types per coding layer, based on a transmission condition of the communication link.
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Abstract
A method for link adaptation at a base station using metric feedback is disclosed. The method can include the steps of communicating with a mobile station over a communication link having one or more sub-channels and during the communication, receiving from the mobile station a plurality of mutual information per coded bit metrics for a plurality of candidate modulation types per coding layer. The mutual information per coded bit metrics can be based on channel state knowledge of the sub-channels. Also, based on the received information, the operational performance of the mobile station can be predicted in view of one or more transmission parameters and performance factors and one or more of the transmission parameters, including a modulation type selected from one of the plurality of candidate modulation types per coding layer, can be selected based on a transmission condition of the communication link.
12 Citations
18 Claims
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1. A method for link adaptation at a base station using metric feedback, comprising:
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communicating with a mobile station over a communication link having one or more sub-channels; during the communication, receiving an index transmitted from the mobile station corresponding to a plurality of mutual information per coded bit metrics for a plurality of candidate modulation types per coding layer, wherein the mutual information per coded bit metrics are based on channel state knowledge of the sub-channels, wherein the index is based on a predetermined table known to both the base station and the mobile station, and wherein the predetermined table is defined based on joint probability distribution of the plurality of mutual information per coded bit metrics and coding rate constraints for each candidate modulation type per coding layer; based on the received index, predicting operational performance of the mobile station in view of one or more transmission parameters and one or more performance factors; and selecting one or more of the transmission parameters, including a modulation type selected from one of the plurality of candidate modulation types per coding layer, based on a transmission condition of the communication link. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for link adaptation at a mobile station, comprising:
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computing a plurality of mutual information per coded bit metrics for a plurality of candidate modulation types per coding layer based on a channel state knowledge of one or more sub-channels; generating feedback information, wherein the feedback information includes the plurality of mutual information per coded bit metrics for the plurality of candidate modulation types per coding layer according to a request from a base station with which the mobile station is communicating; and transmitting the generated feedback information to the base station using an index that can be mapped to mutual information per coded bit metrics using a predetermined table known to the base station and the mobile station that is defined based on joint probability distribution of the plurality of mutual information per coded bit metrics and coding rate constraints for each candidate modulation type coding layer. - View Dependent Claims (9, 10, 11, 12)
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13. A base station for link adaptation that uses metric feedback, comprising:
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a transceiver that communicates with a mobile station over a communication link having a plurality of sub-channels and, during the communication, receives from the mobile station information an index corresponding to a plurality of mutual information per coded bit metrics for a plurality of candidate modulation types per coding layer, wherein the mutual information per coded bit metrics are based on channel state knowledge of the sub-channels, wherein the index is based on a predetermined table known to both the base station and the mobile station, and wherein the predetermined table is defined based on joint probability distribution of the plurality of mutual information per coded bit metrics and coding rate constraints for each candidate modulation type per coding layer; and a performance engine coupled to the transceiver, wherein based on the received plurality of mutual information per coded bit metrics, the performance engine predicts operational performance of the mobile station in view of one or more transmission parameters and performance factors and selects one or more of the transmission parameters, including a modulation type selected from one of the plurality of candidate modulation types per coding layer, based on transmission condition of the communication link. - View Dependent Claims (14, 15)
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16. A mobile station for link adaptation using metrics, comprising:
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a transceiver for communicating with a base station; and a processor coupled to the transceiver, wherein the processor; computes a plurality of mutual information per coded bit metrics for a plurality of candidate modulation types per coding layer based on a channel state knowledge of one or more sub-channels; and generates feedback information, wherein the feedback information includes the plurality of mutual information per coded bit metrics for the candidate modulation types per coding layer according to a request from the base station, wherein the transceiver transmits the generated feedback information to the base station using an index that can be mapped to the mutual information per coded bit metrics using a predetermined table known to the base station and the mobile station that is defined based on joint probability distribution of the plurality of mutual information per coded bit metrics and coding rate constraints for each candidate modulation type per coding layer. - View Dependent Claims (17, 18)
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Specification