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US 2011/0299480 A1Published application
Method and apparatus for supporting adaptive channel state information feedback rate in multi-user communication systems
AssigneeQUALCOMM Incorporated
InventorsGregory A. Breit, Santosh Paul Abraham, Sameer Vermani, Hemanth Sampath, Vincent Knowles Jones
Life of this patent
Estimating the term…
Abstract
Certain aspects of the present disclosure relate to techniques for achieving adaptive channel state information (CSI) feedback rate in multi-user communication systems. A rate by which CSI feedback can be transmitted from each user station of a wireless system to a serving access point may be adjusted based on evolution of a channel between that user station and the access point.
Claims49
A method for wireless communications, comprising:
- selecting, at a first apparatus, a subset of apparatuses from a plurality of apparatuses, wherein the subset is selected based at least on a metric associated with each apparatus of the plurality of apparatuses;
- transmitting a request for channel state information (CSI) and a training sequence to each apparatus in the subset;
- receiving, from each apparatus in the subset, CSI associated with that apparatus, wherein the CSI is determined in response to the request for CSI using the training sequence;
- and
- transmitting data to the plurality of apparatuses based at least on the CSI received from each apparatus in the subset.
2 more elements
An apparatus for wireless communications, comprising:
- a first circuit configured to select a subset of apparatuses from a plurality of apparatuses, wherein the subset is selected based at least on a metric associated with each apparatus of the plurality of apparatuses;
- a transmitter configured to transmit a request for channel state information (CSI) and a training sequence to each apparatus in the subset;
- and
- a receiver configured to receive, from each apparatus in the subset, CSI associated with that apparatus, wherein the CSI is determined in response to the request for CSI using the training sequence, wherein
- the transmitter is also configured to transmit data to the plurality of apparatuses based at least on the CSI received from each apparatus in the subset.
2 more elements
An apparatus for wireless communications, comprising:
- means for selecting a subset of apparatuses from a plurality of apparatuses, wherein the subset is selected based at least on a metric associated with each apparatus of the plurality of apparatuses;
- means for transmitting a request for channel state information (CSI) and a training sequence to each apparatus in the subset;
- and
- means for receiving, from each apparatus in the subset, CSI associated with that apparatus, wherein the CSI is determined in response to the request for CSI using the training sequence, wherein
- the means for transmitting is further configured to transmit data to the plurality of apparatuses based at least on the CSI received from each apparatus in the subset.
2 more elements
A computer-program product for wireless communications, comprising a computer-readable medium comprising instructions executable to:
- select a subset of apparatuses from a plurality of apparatuses, wherein the subset is selected based at least on a metric associated with each apparatus of the plurality of apparatuses;
- transmit a request for channel state information (CSI) and a training sequence to each apparatus in the subset;
- receive, from each apparatus in the subset, CSI associated with that apparatus, wherein the CSI is determined in response to the request for CSI using the training sequence;
- and
- transmit data to the plurality of apparatuses based at least on the CSI received from each apparatus in the subset.
2 more elements
An access point, comprising:
- at least one antenna;
- a first circuit configured to select a subset of wireless nodes from a plurality of wireless nodes, wherein the subset is selected based at least on a metric associated with each wireless node of the plurality of wireless nodes;
- a transmitter configured to transmit via the at least one antenna a request for channel state information (CSI) and a training sequence to each wireless node in the subset;
- and
- a receiver configured to receive, from each wireless node in the subset via the at least one antenna, CSI associated with that wireless node, wherein the CSI is determined in response to the request for CSI using the training sequence, wherein
- the transmitter is also configured to transmit data via the at least one antenna to the plurality of wireless nodes based at least on the CSI received from each wireless node in the subset.
3 more elements
A method for wireless communications, comprising:
- receiving, from an apparatus, a request for channel state information (CSI) and a training sequence;
- determining, in response to the request, CSI using the training sequence;
- transmitting the CSI to the apparatus;
- and
- receiving data from the apparatus based at least on the CSI transmitted to the apparatus.
2 more elements
An apparatus for wireless communications, comprising:
- a receiver configured to receive, from another apparatus, a request for channel state information (CSI) and a training sequence;
- a first circuit configured to determine, in response to the request, CSI using the training sequence;
- and
- a transmitter configured to transmit the CSI to the other apparatus, wherein
- the receiver is also configured to receive data from the other apparatus based at least on the CSI transmitted to the other apparatus.
2 more elements
An apparatus for wireless communications, comprising:
- means for receiving, from another apparatus, a request for channel state information (CSI) and a training sequence;
- means for determining, in response to the request, CSI using the training sequence;
- and
- means for transmitting the CSI to the other apparatus, wherein
- the means for receiving is further configured to receive data from the other apparatus based at least on the CSI transmitted to the other apparatus.
2 more elements
A computer-program product for wireless communications, comprising a computer-readable medium comprising instructions executable to:
- receive, from an apparatus, a request for channel state information (CSI) and a training sequence;
- determine, in response to the request, CSI using the training sequence;
- transmit the CSI to the apparatus;
- and
- receive data from the apparatus based at least on the CSI transmitted to the apparatus.
2 more elements
An access terminal, comprising:
- at least one antenna;
- a receiver configured to receive, from an access point via the at least one antenna, a request for channel state information (CSI) and a training sequence;
- a first circuit configured to determine, in response to the request, CSI using the training sequence;
- and
- a transmitter configured to transmit, via the at least one antenna, the CSI to the access point, wherein
- the receiver is also configured to receive, via the at least one antenna, data from the access point based at least on the CSI transmitted to the access point.
3 more elements
Dependencies are inferred from the claim text.