Network-controlled feedback for MIMO systems
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsStephen Grant, Jung-Fu Cheng, Yi-Pin Wang, Karl Molnar, Leonid Krasny
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Abstract
In a selective MIMO system, the mobile station provides channel quality feedback for one or more possible transmission mode. The mobile station provides channel quality feedback for a first mode regardless of channel conditions and determines whether to provide feedback for one or more additional modes based on current channel conditions.
Claims30
A method implemented by a receiving station in a mobile communication network of controlling feedback load on an uplink channel, said method comprising:
- providing channel quality feedback to a multiple antenna transmitting station for a first downlink transmission mode corresponding to a first antenna configuration;
- generating a performance metric;
- and
- if the performance metric exceeds a first threshold, providing channel quality feedback for one or more additional downlink transmission modes to said transmitting station.
A receiving station in a mobile communication network comprising:
- a receiver to receive signals from a remote station;
- a transmitter to transmit signals to the remote station;
- and
- a controller operatively connected to the receiver and transmitter for controlling the receiver and transmitter, said controller operative to:
- provide channel quality feedback to a multiple antenna transmitting station for a first downlink transmission mode corresponding to a first antenna configuration;
- generate a performance metric;
- and
- provide channel quality feedback for one or more additional downlink transmission modes to said remote station if the performance metric exceeds a first threshold.
A base station in a mobile communication network comprising:
- a controller configured to generate a feedback threshold based on conditions associated with a downlink channel for one or more remote stations;
- and
- a transmitter configured to transmit the feedback threshold to one or more of the remote stations to control an amount of channel quality feedback received at a multiple antenna transmitting station from the remote stations.
A method for controlling an amount of channel quality feedback received at a base station from one or more remote stations in a mobile communication network, the method comprising:
- generating a feedback threshold based on conditions associated with downlink channels between a base station and one or more remote stations;
- and
- transmitting the feedback threshold from the base station to one or more of the remote stations to control an amount of channel quality feedback received at a multiple antenna transmitting station from the remote stations.
Dependencies are inferred from the claim text.