Channel rank feedback in multiple-input multiple-output communication systems
AssigneeApple Inc.
InventorsJayesh H. Kotecha, James W. McCoy
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Abstract
Embodiments of a system and methodology are disclosed for aperiodic (i.e., non-periodic) feedback of channel-side information, such as channel rank information, to a base station by having the receiver/UE initiate the feedback instead of using a scheduled feedback approach. The autonomous feedback of channel-side information may use one of several different types of physical channel structures for uplink scheduling requests, such as those being discussed for inclusion in the emerging LTE platform standard.
Claims33
A method for processing signals in a communication system comprising a base station and one or more user equipment devices, wherein the base station communicates with each user equipment device over a respective transmission channel, the method comprising:
- receiving a channel rank request at the base station from a user equipment device for transmission of information over a communication channel from the base station to the user equipment at a predetermined channel rank;
- subsequently using the base station to transmit information over the communication channel;
- and
- using the user equipment device to determine whether the channel rank of the subsequent transmission corresponds to the requested channel rank.
A method for processing signals in a wireless communications base station, the method comprising:
- receiving channel rank feedback information at the base station from a user equipment device in response to an autonomous determination by the user equipment device that the channel rank feedback information should be fed back to the base station, the channel rank feedback information is being received via a physical resource;
- wherein:
- the autonomous determination is based at least in part on a comparison of current channel rank feedback information to previous channel rank feedback information;
- and
- the channel comprises a transmission channel between the base station and the user equipment device.
A method for processing signals in a wireless communications base station, the method comprising:
- receiving channel rank feedback information at the base station from a user equipment device in response to an autonomous determination by the user equipment device that the channel rank feedback information should be fed back to the base station, the channel rank feedback information being received via a physical resource;
- wherein the autonomous determination is based at least in part on a determination that current channel rank feedback information differs from previous channel rank feedback information by a predetermined amount.
A wireless communication user equipment device, comprising:
- a processing apparatus adapted to generate channel rank feedback information from transmission channel state information;
- and
- a transceiver apparatus operably coupled to the processing apparatus, the transceiver apparatus adapted to transmit the channel rank feedback information in response to an autonomous determination by the user equipment device that channel rank feedback information should be fed back to a base station;
- wherein the autonomous determination is based at least in part on a comparison of current channel rank feedback information to previous channel rank feedback information.
A wireless communication user equipment device, comprising:
- a processing apparatus adapted to generate channel rank feedback information from transmission channel state information;
- and
- a transceiver apparatus operably coupled to the processing apparatus, the transceiver apparatus adapted to transmit the channel rank feedback information in response to an autonomous determination by the user equipment device that channel rank feedback information should be fed back to a base station;
- wherein the autonomous determination is based at least in part on a determination that current channel rank feedback information differs from previous channel rank feedback information by a predetermined amount.
A method of operating a wireless communications device, the method comprising:
- transmitting a channel rank request to a network entity, the channel rank request specifying a predetermined channel rank for transmission of information over a communication channel between the entity and the device;
- receiving the information over the communication channel;
- and
- determining whether channel rank of the transmission corresponds to the predetermined channel rank.
Dependencies are inferred from the claim text.