Path-loss estimation for uplink power control in a carrier aggregation environment
First Claim
1. A method for uplink power control, comprising:
- receiving, at a User Equipment (UE), a component carrier list, the component carrier list compiled at an evolved Node B (eNodeB) to group multiple component carriers based on a geographic location of a transmission node of each component carrier (CC) and a frequency band in which each CC is configured to communicate;
selecting, at the UE, an estimation CC from the component carrier list on which to perform a path-loss estimation; and
estimating, at the UE, a path-loss estimation used for uplink power control for at least one CC in the CC list based on the path-loss estimation of the estimation CC, wherein the path-loss estimation on the estimation CC is performed by adding a base level value obtained by the UE through averaging multiple downlink Reference Signal Received Power (RSRP) measurements on a Primary Serving Cell (PCell) for which the UE is configured together with an estimated path-loss offset parameter value where a CC associated with the PCell is selected as the estimation CC, wherein the estimated path-loss offset parameter is configured to compensate for a path-loss difference between respective communications on two CCs, wherein the path-loss difference arises because at least one of a difference in frequency bands for the respective communications and a given propagation environment.
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Abstract
Technology for uplink power control in a wireless network is disclosed. Receiving a component carrier list at a User Equipment (UE) is disclosed where the component carriers grouped in the list have one or more common characteristics relative to the power necessary for uplink transmission on those component carriers. A path-loss estimation performed on the downlink of a component carrier in the component carrier list can, therefore, be used to control uplink transmission for other component carriers in the list. Additionally, a UE can receive a path-loss difference parameter providing an offset for one or more factors related to the power necessary for uplink transmission between a component carrier with certain characteristics relative to those factors and a component carrier with different characteristics relative to those same factors.
27 Citations
25 Claims
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1. A method for uplink power control, comprising:
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receiving, at a User Equipment (UE), a component carrier list, the component carrier list compiled at an evolved Node B (eNodeB) to group multiple component carriers based on a geographic location of a transmission node of each component carrier (CC) and a frequency band in which each CC is configured to communicate; selecting, at the UE, an estimation CC from the component carrier list on which to perform a path-loss estimation; and estimating, at the UE, a path-loss estimation used for uplink power control for at least one CC in the CC list based on the path-loss estimation of the estimation CC, wherein the path-loss estimation on the estimation CC is performed by adding a base level value obtained by the UE through averaging multiple downlink Reference Signal Received Power (RSRP) measurements on a Primary Serving Cell (PCell) for which the UE is configured together with an estimated path-loss offset parameter value where a CC associated with the PCell is selected as the estimation CC, wherein the estimated path-loss offset parameter is configured to compensate for a path-loss difference between respective communications on two CCs, wherein the path-loss difference arises because at least one of a difference in frequency bands for the respective communications and a given propagation environment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An uplink power control device, comprising:
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a receiving module operating at the UE, the receiving module configured to receive a CC list, from an evolved Node B (eNodeB), the CC list comprising a set of CCs configured both to communicate in a same frequency band and to transmit on a downlink channel from a similar geographic transmission location; a selection module operating at the UE, the selection module in communication with the receiving module and configured to select, from the CC list, an estimation CC on which to perform a path-loss estimation; and an estimation module in communication with the selection module and configured to; perform the path-loss estimation on the estimation CC, as selected by the selection module, determine a path-loss estimation used for uplink power control for at least one CC in the CC list based on the path-loss estimation of the estimation CC; and perform the path-loss estimation on the estimation CC by adding an average value for multiple downlink Reference Signal Received Power (RSRP) measurements on the estimation CC, which estimation CC is also associated with a Primary Serving Cell (PCell) for which the UE is configured, together with a path-loss difference parameter received from the eNodeB, wherein the path-loss difference parameter is configured to provide a difference in a path-loss between two CCs for at least one of a first scenario and a second scenario, wherein, according to the first scenario, a first CC of the two CCs operates in a first frequency band and a second CC of the two CCs operates in a second frequency band, and, according to the second scenario, the difference accounts for a given propagation environment. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A computer program product, comprising a non-transitory computer usable medium having a computer readable program code embodied therein, the computer readable program code adapted to be executed to implement a method for uplink power control at a User Equipment (UE), comprising:
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receiving, at the UE, a CC list from an eNodeB, the CC list comprising a set of CCs configured both to communicate in a same frequency band and to transmit on a downlink channel from a similar geographic transmission location; selecting, at the UE, an estimation CC from the component carrier list on which to perform a path-loss estimation; performing a path-loss estimation on an estimation CC selected from the CC list; estimating, at the UE, a path-loss estimation used for uplink power control for at least one CC in the CC list based on the path-loss estimation of the estimation CC;
wherein performing the path-loss estimation on the estimation CC includes adding an average value for multiple downlink Reference Signal Received Power (RSRP) measurements on the estimation CC, which estimation CC is also associated with a Primary Serving Cell (PCell) for which the UE is configured, together with a path-loss difference parameter received from the eNodeB, wherein the path-loss difference parameter provides a difference in a path-loss between two CCs for at least one of a first scenario and a second scenario, wherein, according to the first scenario, a first CC of the two CCs operates in a first frequency band and a second CC of the two CCs operates in a second frequency band, and, according to the second scenario, the difference accounts for a given propagation environment. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification