US 11,994,814 B2Granted

Channel state information measurements for license assisted access

AssigneeTelefonaktiebolaget LM Ericsson (publ)

InventorsMattias Frenne, Jung-Fu Cheng, Sorour Falahati, Havish Koorapaty, Daniel Larsson

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Abstract

Systems and methods relating to accurate Channel State Information (CSI) measurements for a License Assisted Secondary Cell (LA SCell) are disclosed herein. An exemplary user equipment enabled includes a transceiver, at least one processor, and memory containing instructions executable by the at least one processor whereby the user equipment operates to detect whether a downlink control information (DCI) message indicating that a Channel State Information Reference Symbol (CSI-RS) transmission from an LA SCell of the user equipment is present in a subframe. When the user equipment detects that the DCI message indicates that a CSI-RS transmission from the LA SCell is present in the subframe, it processes a CSI-RS measurement. When the user equipment detects that the DCI message does not indicate that a CSI-RS transmission from the LA SCell is present in the subframe, it refrains from processing the CSI-RS measurement.

Claims20

Dependent claims

A wireless device enabled to operate in a cellular communications network, the wireless device comprising:

a transceiver;
at least one processor;
and
memory containing instructions executable by the at least one processor whereby the wireless device operates to:
determine whether a Channel State Information Reference Symbol (CSI-RS) transmission from a License Assisted Secondary Cell (LA SCell) of the wireless device is present in a subframe, the LA SCell being in an unlicensed frequency band;
perform a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is present in the subframe;
and
refrain from performing a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is not present in the subframe,
wherein determining whether a CSI-RS transmission from the LA SCell is present in the subframe comprises one of:
determining whether the wireless device has received an indication of the CSI-RS transmission for the cell for a subframe, wherein the indication is received in a downlink control information (DCI);
determining whether the wireless device has received an indication that the subframe is a downlink subframe, wherein the indication is received in a downlink control information (DCI) and wherein if the subframe is a downlink subframe the CSI-RS transmission is present and if the subframe is not a downlink subframe the CSI-RS transmission is not present;
determining whether the wireless device has received a downlink scheduling assignment for the cell for the subframe, wherein determining that a downlink scheduling assignment has been received for the cell for the subframe indicates that a CSI-RS transmission is present in the subframe and determining that a downlink scheduling assignment has not been received for the cell for the subframe indicates that a CSI-RS transmission is not present in the subframe;
and
determining whether the subframe is contains a discovery signal for the cell, wherein determining that the subframe contains a discovery signal for the cell indicates that a CSI-RS transmission is present in the subframe and determining that the subframe does not contains a discovery signal for the cell indicates that a CSI-RS transmission is not present in the subframe.

11 more elements

A method of operation of a wireless device enabled to operate in a cellular communications network, the method comprising:

determining whether a Channel State Information Reference Symbol (CSI-RS) transmission from a License Assisted Secondary Cell (LA SCell) of the wireless device is present in a subframe, the LA SCell being in an unlicensed frequency band;
performing a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is present in the subframe;
and
refraining from performing a CSI-RS measurement for the LA SCell for the subframe upon determining that a CSI-RS transmission from the LA SCell is not present in subframe,
wherein determining whether a CSI-RS transmission from the LA SCell is present in the subframe comprises one of:
determining whether the wireless device has received an indication of the CSI-RS transmission for the cell for a subframe, wherein the indication is received in a downlink control information (DCI);
determining whether the wireless device has received an indication that the subframe is a downlink subframe, wherein the indication is received in a downlink control information (DCI) and wherein if the subframe is a downlink subframe the CSI-RS transmission is present and if the subframe is not a downlink subframe the CSI-RS transmission is not present;
determining whether the wireless device has received a downlink scheduling assignment for the cell for the subframe, wherein determining that a downlink scheduling assignment has been received for the cell for the subframe indicates that a CSI-RS transmission is present in the subframe and determining that a downlink scheduling assignment has not been received for the cell for the subframe indicates that a CSI-RS transmission is not present in the subframe;
and
determining whether the subframe is contains a discovery signal for the cell, wherein determining that the subframe contains a discovery signal for the cell indicates that a CSI-RS transmission is present in the subframe and determining that the subframe does not contains a discovery signal for the cell indicates that a CSI-RS transmission is not present in the subframe.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/106,487Filed 7 Feb 2023 · continuation
Priority: 16 Jun 2014
Published: US 2023/0314983 A15 Oct 2023
Granted: 28 May 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

G03G 15/0812
On a donor element, e.g. belt, roller: characterised by the developer regulating means, e.g. structure of doctor blade
G03G 15/0806
Using a solid developer, e.g. powder developer: on a donor element, e.g. belt, roller
G03G 15/0865
Arrangements for preparing, mixing, supplying or dispensing developer: arrangements for supplying new developer
G03G 21/1814
Arrangements or disposition of the complete process cartridge or parts thereof: details of parts of process cartridge, e.g. for charging,…

Family

Application62/012,616Us provisional application · filed 16 Jun 2014
Application14/737,957Parent of this continuation · filed 12 Jun 2015
Application16/113,905Parent of this continuation · filed 27 Aug 2018
US 10,063,304 B2Parent of this continuation · filed 28 Aug 2018
Application16/773,745Parent of this continuation · filed 14 Apr 2020
US 10,627,737 B2Parent of this continuation · filed 21 Apr 2020
US 2023/0314983 A1Pre-grant publication · published 5 Oct 2023
US 11,573,504 B2Parent of this continuation
US 2015/0365152 A1Published application
US 2019/0011852 A1Published application
US 2020/0233334 A1Published application
US 11,994,814 B2This patent

From the US filing history. Foreign family members aren’t listed.