Network node and method for managing power of cell reference symbols
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsTomas Lagerqvist, Christian Skärby, Walter Müller
Life of this patent
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Abstract
A method performed by a network node for managing power of Cell Reference Symbols, CRS, wherein the network node operates one or more cells and the network node is configured to transmit the CRS in a first power mode. When the network node identifies a first cell which is not actively serving any UEs, which cell is also referred to as an empty cell, the network node reduces the power of the CRS in the first cell in relation to the first power mode. By reducing the power of the CRS, the overall interference of the CRS from the empty cell is reduced, thereby enhancing the performance in cells actively serving UEs.
Claims18
A method performed by a network node for managing power, wherein the network node operates one or more cells, the method comprising:
- transmitting Cell Reference Symbols (CRS) in a first power mode, wherein in the first power mode the CRS and data symbols are transmitted with a same power;
- when a first cell is identified that is not actively serving any User Equipments (UEs), reducing power of the CRS in the first cell in relation to the first power mode, wherein the reduced power is applied on the CRS that are sent on all Orthogonal Frequency-Division Multiplexing (OFDM) symbols of a subframe, except a first OFDM symbol of the subframe;
- and
- when the first cell is determined to actively serve at least one UE:
- receiving, from neighbouring network nodes, information about a CRS power mode and a number of actively served UEs in neighbouring cells;
- identifying, based on the received information from the neighbouring network nodes, a second cell that is actively serving at least one UE and is neighbouring a cell where the number of actively served UEs exceeds a threshold;
- and
- increasing the CRS power in the second cell in relation to the first power mode.
A network node for managing power, wherein the network node operates one or more cells, the network node further being configured to:
- transmit Cell Reference Symbols (CRS) in a first power mode, wherein in the first power mode the CRS and data symbols are transmitted with a same power;
- identify a first cell that is not actively serving any User Equipments (UEs);
- reduce power of the CRS in the first cell in relation to the first power mode, wherein the reduced power is applied on the CRS that are sent on all Orthogonal Frequency-Division Multiplexing (OFDM) symbols of a subframe, except a first OFDM symbol of the subframe;
- receive, from neighbouring network nodes, information about a CRS power mode and a number of actively served UEs in neighbouring cells;
- identify, based on the received information from the neighbouring network nodes, a second cell that is actively serving at least one UE and is neighbouring a cell where the number of actively served UEs exceeds a threshold;
- and
- increase the CRS power in the second cell in relation to the first power mode.
Dependencies are inferred from the claim text.