Selecting a modulation and coding scheme for beamformed communication

摘要

In adaptive modulation and coding scheme (MCS) selection for directional antenna systems, at least one table is defined that maps different ranges of signal quality values to different sets of MCS parameters. In some implementations, each range corresponds to a separate table (e.g., a given table will include the MCS and other information for that range of signal quality values). In the event an abrupt change in signal quality is detected (e.g., a change in received signal strength greater than or equal to a defined threshold), instead of using a conventional rate selection algorithm, a new MCS is selected through the use of the ranges from the table(s). In this way, a relatively large change in MCS may be accommodated, if warranted by the change in signal quality.

主权项

1. An apparatus for wireless communication, comprising:
a transceiver configured to receive signal quality feedback from another apparatus; and a processing system configured to:
select a first modulation and coding scheme associated with a first range of signal quality specified by at least one rate table, wherein the at least one rate table maps the first range of signal quality to a first set of modulation and coding schemes and maps a second range of signal quality to a second set of modulation and coding schemes;determine a first signal quality associated with a first communication that uses the first modulation and coding scheme, wherein the first signal quality is determined from the signal quality feedback;determine a second signal quality associated with a second communication that uses the first modulation and coding scheme, wherein the second signal quality is determined from the signal quality feedback;calculate a difference between the first signal quality and the second signal quality;compare the difference to a threshold; andinvoke a modulation and coding scheme selection procedure if the comparison indicates that the difference is greater than or equal to the threshold, wherein the modulation and coding scheme selection procedure comprises a determination of whether to select a second modulation and coding scheme for a subsequent communication from the first set of modulation and coding schemes or from the second set of modulation and coding schemes.