Channel state feedback for multi-cell MIMO
First Claim
1. A method for use in a multiple-input multiple-output communication network in which:
- the network comprises a plurality of cells provided by one or more base stations operable to transmit signals on at least one downlink to and receive signals on at least one uplink from one or more user equipments,a user equipment is operable to feed back to the network reports on channel state information, CSI, relating to one or more channels between the one or more base stations and that user equipment; and
whereinthe one or more base stations are operable to adapt downlink signals to the one or more user equipments based on the CSI reports, the method comprising;
identifying uplink resources for a user equipment-initiated channel state message;
the user equipment judging a need for the user equipment-initiated channel state message based on information not available to the network of a change in capabilities of the user equipment including at least one of;
number of receiving antennas available, available processing power, and number of transceivers available; and
if the user equipment judges a need for the user equipment-initiated channel state message, the user equipment sending the user equipment-initiated channel state message to the network using the uplink resources identified.
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Accused Products
Abstract
Disclosed is a method for use in a multiple-input multiple-output (MIMO) communication network in which the network includes a plurality of cells provided by one or more base stations operable to transmit signals on at least one downlink to, and receive signals on at least one uplink from, one or more user equipments. A user equipment feeds back to the network reports on channel state information, CSI, relating to one or more channels between base stations and that user equipment, and base stations adapt downlink signals to user equipments based on the CSI reports, the method including: identifying uplink resources for a user equipment-initiated channel state message; the user equipment judging a need for a user equipment-initiated channel state message based on information not available to the network; and the user equipment sending the user equipment-initiated channel state message to the network using the uplink resources identified.
27 Citations
13 Claims
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1. A method for use in a multiple-input multiple-output communication network in which:
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the network comprises a plurality of cells provided by one or more base stations operable to transmit signals on at least one downlink to and receive signals on at least one uplink from one or more user equipments, a user equipment is operable to feed back to the network reports on channel state information, CSI, relating to one or more channels between the one or more base stations and that user equipment; and
whereinthe one or more base stations are operable to adapt downlink signals to the one or more user equipments based on the CSI reports, the method comprising; identifying uplink resources for a user equipment-initiated channel state message; the user equipment judging a need for the user equipment-initiated channel state message based on information not available to the network of a change in capabilities of the user equipment including at least one of;
number of receiving antennas available, available processing power, and number of transceivers available; andif the user equipment judges a need for the user equipment-initiated channel state message, the user equipment sending the user equipment-initiated channel state message to the network using the uplink resources identified. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A user equipment, UE, for use in a multiple-input multiple-output communication network comprising a plurality of cells provided by one or more base stations operable to transmit signals on at least one downlink to and receive signals on at least one uplink from the UE, the UE comprising:
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a memory; and a processor coupled to the memory and configured to; feed back to the network reports on channel state information, CSI, relating to one or more channels between the one or more base stations and the UE for allowing the one or more base stations to adapt downlink signals to the UE based on the CSI reports; identify an uplink resource suitable for a user equipment-initiated channel state message; judge a need for the user equipment-initiated channel state message based on information not available to the network of a change in capabilities of the user equipment including at least one of;
number of receiving antennas available, available processing power, and number of transceivers available; andif a need is judged for the user equipment-initiated channel state message, send the user equipment-initiated channel state message to the network using the available uplink resource.
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13. A wireless communication system comprising:
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one or more user equipments, UEs; and at least one base station, BS, providing a plurality of cells for multiple-input multiple-output communication with the one or more UEs, the cells operable to transmit signals on at least one downlink to and receive signals on at least one uplink from the one or more UEs, wherein; the one or more UEs are configured to feed back to a network reports on channel state information, CSI, relating to one or more channels between the at least one BS and the one or more UEs for allowing the at least one BS to adapt downlink signals to the one or more UEs based on the CSI reports; and the at least one BS is configured to adapt downlink signals to the one or more UEs based on the CSI reports; wherein the one or more UEs is further configured to; identify an uplink resource suitable for a user equipment-initiated channel state message; judge a need for the user equipment-initiated channel state message based on information not available to the network of a change in capabilities of the user equipment including at least one of;
number of receiving antennas available, available processing power, and number of transceivers available; andif a need is judged for the user equipment-initiated channel state message, send the user equipment-initiated channel state message to the network using said uplink resource; and wherein the at least one BS is further configured to; make available said uplink resource suitable for the user equipment-initiated channel state message; receive the user equipment-initiated channel state message on the uplink resource made available; and reconfigure the channel in response to the user equipment-initiated channel state message.
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Specification