Controlling CSI reporting in a LTE cellular communication network
First Claim
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1. A method in a base station in a Long Term Evolution, LTE, cellular communication network for controlling Channel State Information, CSI, reports to be sent by a User Equipment, UE, wherein the CSI reports are based on measurements on cell specific reference signals from the base station, the method comprising:
- determining an interval/pattern with which the cell specific reference signals should be sent from the base station,determining a parameter dependent on the interval/pattern which is indicative of when the UE should send. CSI reports to distribute CSI reports from different UEs,sending the parameter to the UE, andsending a command to the UE to transmit a CSI report wherein the parameter is a time delay defined from reception at the UE of the command to send the CSI report to the transmission of the CSI report, wherein the parameter that is the time delay is sent to the UE separately from the command to the UE to transmit the CSI report and separately from the cell specific reference signals, and wherein the command to the UE to transmit the CSI report is sent to the UE separately from the cell specific reference signals.
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Abstract
The object of the present invention is to distribute the transmission of the CSI (Channel state information) reports among the different UEs, wherein the CSI reports are based on measurements on cell specific reference signals from the base station. This is achieved in a LTE cellular communication network by controlling the transmission of CSI reports from the UEs.
20 Citations
24 Claims
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1. A method in a base station in a Long Term Evolution, LTE, cellular communication network for controlling Channel State Information, CSI, reports to be sent by a User Equipment, UE, wherein the CSI reports are based on measurements on cell specific reference signals from the base station, the method comprising:
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determining an interval/pattern with which the cell specific reference signals should be sent from the base station, determining a parameter dependent on the interval/pattern which is indicative of when the UE should send. CSI reports to distribute CSI reports from different UEs, sending the parameter to the UE, and sending a command to the UE to transmit a CSI report wherein the parameter is a time delay defined from reception at the UE of the command to send the CSI report to the transmission of the CSI report, wherein the parameter that is the time delay is sent to the UE separately from the command to the UE to transmit the CSI report and separately from the cell specific reference signals, and wherein the command to the UE to transmit the CSI report is sent to the UE separately from the cell specific reference signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method in a User Equipment, UE, in a Long Term Evolution, LTE, cellular communication network for sending Channel State Information, CSI, reports, wherein the CSI reports are based on measurements on cell specific reference signals from a base station, and the cell specific reference signals are sent with a predefined interval/pattern, the method comprising:
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using a parameter, wherein the parameter is dependent on the interval/pattern and is indicative of when the UE should send CSI reports, wherein the parameter is received from the base station, receiving a command to transmit a CSI report wherein the parameter is a time delay defined from reception at the UE of the command to send the CSI report to the transmission of the CSI report, and sending the CSI report responsive to the command according to the time delay, wherein the parameter that is the time delay is received by the UE separately from the command to transmit the CSI report and separately from the cell specific reference signals, and wherein the command to transmit the CSI report is received by the UE separately from the cell specific reference signals. - View Dependent Claims (9, 10, 11, 12)
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13. A base station adapted for a Long Term Evolution, LTE, cellular communication network for controlling Channel State Information, CSI, reports to be sent by a User Equipment, UE, wherein the CSI reports are based on measurements on cell specific reference signals from the base station, the base station comprising:
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a first processing unit configured to determine an interval/pattern with which the cell specific reference signals should be sent from the base station, a second processing unit configured to determine a parameter dependent on the interval/pattern which is indicative of when the UE should send CSI reports to distribute CSI reports from different UEs, and a transmitter configured to send the parameter to the UE, wherein the transmitter is further configured to send a command to the UE to transmit a CSI report wherein the parameter is a time delay defined from reception at the UE of the command to send the CSI report to the transmission of the CSI report, wherein the parameter that is the time delay is sent to the UE separately from the command to the UE to transmit the CSI report and separately from the cell specific reference signals, and wherein the command to the UE to transmit the CSI report is sent to the UE separately from the cell specific reference signals. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A User Equipment, UE, adapted for a Long Term Evolution, LTE, cellular communication network for sending Channel State Information, CSI, reports, wherein the CSI reports are based on measurements on cell specific reference signals from a base station, and the cell specific reference signals are sent with a predefined interval/pattern, the UE comprising:
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a CSI reporting manager configured to use a parameter, wherein the parameter is dependent on the interval/pattern and is indicative of when the UE should send CSI reports, a transmitter configured to send the CSI reports according to the parameter, and a receiver configured to receive the parameter from the base station, wherein the receiver is further configured to, receive a command to transmit a CSI report wherein the parameter is a time delay defined from reception at the UE of the command to send the CSI report to the transmission of the CSI report, wherein the transmitter is configured to send the CSI res ort responsive to the command according to the time delay, wherein the parameter that is the time delay is received by the UE separately from the command to transmit the CSI report and separately from the cell specific reference signals, and wherein the command to transmit the CSI report is received by the UE separately from the cell specific reference signals. - View Dependent Claims (21, 22, 23, 24)
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Specification