Method and arrangement for CSI measurement
AssigneeGuangdong Oppo Mobile Telecommunications Corp., Ltd.
InventorsJinhua Liu, Xinghua Song
Life of this patent
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Abstract
There are proposed a base station and User Equipment, UE, for determining and applying separate Channel State Information, CSI, for flexible subframes in a wireless communication system applying time division duplex, TDD. The method in a UE comprises, for a flexible subframe, receiving (103) a signal from a base station, and determining (104) whether a reference signal for CSI measurement is comprised in the received signal. The method further comprises determining (106) CSI for the flexible sub-frame based on the reference signal when a reference signal for CSI measurement is comprised in the received signal, and reporting (107) the determined CSI to the base station.
Claims9
A method performed by a User Equipment (UE) for determining separate channel state information (CSI) for a flexible subframe in a wireless communication system applying time division duplex (TDD), the method comprising:
- for a flexible subframe:
- receiving a signal from a base station within the flexible subframe;
- determining whether a reference signal for CSI measurement is comprised in the received signal, wherein determining whether a reference signal for CSI measurement is comprised in the received signal comprises:
- determining a power of the reference signal based on estimating a correlation between a known reference sequence and a sequence of the received signal, and
- in response to a comparison of the determined power of the reference signal to a first threshold value, determining that the reference signal is comprised in the received signal;
- determining CSI for the flexible subframe based on the reference signal when a reference signal for CSI measurement is comprised in the received signal, in response to determining that the UE is scheduled for downlink communication in the flexible subframe and that the UE is within an interval configured for determining CSI within flexible subframes;
- and
- reporting the determined CSI to the base station;
- wherein the determined CSI for the flexible subframe is reported to the base station in one or more uplink resources until at least one of the following is fulfilled:
- a predefined time period has elapsed after the determining of the CSI for the flexible subframe, and
- a more recent CSI for a subsequent flexible subframe is determined.
User Equipment (UE) for determining separate channel state information, CSI, for a flexible subframe in a wireless communication system applying time division duplex (TDD), the UE comprising:
- memory storing software;
- and
- processing circuitry configured to execute the software to:
- receive a signal from a base station in a flexible subframe;
- determine whether a reference signal for CSI measurement is comprised in the received signal;
- and
- determine CSI for the flexible subframe based on the reference signal when a reference signal for CSI measurement is comprised in the received signal, in response to determining that the UE is scheduled for downlink communication in the flexible subframe and that the UE is within an interval configured for determining CSI within flexible subframes;
- and
- report the determined CSI to the base station;
- wherein in determining whether a reference signal for CSI measurement is comprised in the received signal, the processing circuitry is further configured to execute the software to:
- determine a power of the reference signal based on estimating a correlation between a known reference sequence and a sequence of the received signal, and
- in response to a comparison of the determined power of the reference signal to a first threshold value, determine that the reference signal is comprised in the received signal;
- and
- wherein the determined CSI for the flexible subframe is reported to the base station in one or more therefore configured uplink resources until at least one of the following is fulfilled:
- a predefined time period has elapsed after the determining of the CSI for the flexible subframe, and
- a more recent CSI for a subsequent flexible subframe is determined.
Dependencies are inferred from the claim text.