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 using hybrid automatic repeat request (HARQ);
during the communication, receiving from the mobile station a plurality of mutual information per coded bit metrics for a plurality of candidate modulation types, wherein the plurality of mutual information per coded bit metrics are based on channel state knowledge of the one or more sub-channels;
based on the plurality of mutual information per coded bit metrics, computing a new mutual information per coded bit metric corresponding to first and subsequent HARQ transmissions taking into account a new effective code rate and a new code size, wherein the mobile station is to combine the first and subsequent HARQ transmissions;
predicting operational performance of the mobile station in view of one or more transmission parameters corresponding to the first and subsequent HARQ transmissions and one or more performance factors; and
selecting one or more of the transmission parameters based on the predicting.
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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 information relating to one or more mutual information per coded bit metrics for one or more candidate modulation types. 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 can be selected based on a transmission condition of the communication link.
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Citations
12 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 using hybrid automatic repeat request (HARQ); during the communication, receiving from the mobile station a plurality of mutual information per coded bit metrics for a plurality of candidate modulation types, wherein the plurality of mutual information per coded bit metrics are based on channel state knowledge of the one or more sub-channels; based on the plurality of mutual information per coded bit metrics, computing a new mutual information per coded bit metric corresponding to first and subsequent HARQ transmissions taking into account a new effective code rate and a new code size, wherein the mobile station is to combine the first and subsequent HARQ transmissions; predicting operational performance of the mobile station in view of one or more transmission parameters corresponding to the first and subsequent HARQ transmissions and one or more performance factors; and selecting one or more of the transmission parameters based on the predicting. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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 from the mobile station a plurality of mutual information per coded bit metrics for a plurality of candidate modulation types, wherein the plurality of mutual information per coded bit metrics are based on channel state knowledge of the one or more sub-channels; based on the plurality of mutual information per coded bit metrics, predicting operational performance of the mobile station in view of one or more transmission parameters by mapping a mutual information per coded bit metric corresponding to a candidate modulation type to a packet error rate under potential coding rates and packet sizes according to a parameterized relationship defined as
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8. A method for link adaptation at a mobile station, comprising:
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for each candidate modulation type of a plurality of candidate modulation types, computing a mutual information per coded bit on at least one sub-channel as the mutual information between each coded bit and a log-likelihood ratio of that bit based on a receiver type and one or more of;
eigenvalues, eigen-subspace powers, and a condition number of a channel state matrix, wherein the eigen values and the eigen-subspace powers are used to obtain a minimum eigen value, a maximum eigen value, and an eigen mode power distribution parameter;averaging the mutual information per coded bit over one or more of the 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 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. - View Dependent Claims (9, 10, 11)
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12. 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 based on a channel state knowledge of one or more sub-channels by; deriving one or more variables relating to channel condition based on the channel state knowledge and a receiver type; and mapping the one or more variables to the mutual information per coded bit I(H) of a measured channel H as
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Specification