US 10,567,140 B2Granted

Method and apparatus for allocating channel state information-reference signal in wireless communication system

OwnerSungjun Yoon, Kibum Kwoninventors

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Abstract

Disclosed are an apparatus for Channel State Information-Reference Signal (CSI-RS) allocation and a method for CSI-RS transmission using the same in a wireless communication system. A CSI-RS for each antenna port is allocated to REs or subcarriers on a basis of a symbol or symbol axis in a subframe or Resource Block (RB), and is allocated in such a manner that a distance between neighboring CSI-RS allocation REs or subcarriers may be 3 REs or subcarriers. Accordingly, in the range of following CSI-RS transmission overhead, CSI-RSs are allocated to a time-frequency resource domain in such a manner so as to have perfect orthogonality or quasi-orthogonality according to cells or cell groups. Then, the CSI-RSs, which have been allocated to the time-frequency resource domain, are transmitted.

Claims12

Dependent claims

A communication method comprising:

receiving, at a user equipment (UE), at least a part of a first subframe from an eNB, wherein the first subframe consists of resource elements arranged in frequency and time domain;
receiving, at the UE, at least a part of a second subframe from the eNB, wherein the second subframe consists of resource elements arranged in frequency and time domain and the part of the first subframe and the part of the second subframe are received simultaneously;
obtaining, at the UE, a first Cell State Information Reference Signal (CSI-RS) from a first resource element of the first subframe;
obtaining, at the UE, a second CSI-RS from a second resource element of the first subframe, wherein the first resource element and the second resource element are adjacent to each other;
obtaining, at the UE, a third CSI-RS from a third resource element of the second subframe;
obtaining, at the UE, a fourth CSI-RS from a fourth resource element of the second subframe;
measuring, at the UE, channel state at least based on one of the first CSI-RS, the second CSI-RS, the third CSI-RS and the fourth CSI-RS;
and
transmitting, at the UE, the measured channel state to the eNB,
wherein a location of the first resource element in the first subframe in frequency and time domain is same as a location of the third resource element in the second subframe in frequency and time domain;
and
a location of the second resource element in the first subframe in frequency and time domain is same as a location of the fourth resource element in the second subframe in frequency and time domain.

9 more elements

A communication apparatus comprising:

a memory;
and
a processor,
wherein the processor, when executing program instructions stored in the memory, is configured to:
cause the apparatus to receive at least a part of a first subframe from an eNB, wherein the first subframe consists of resource elements arranged in frequency and time domain;
cause the apparatus to receive at least a part of a second subframe from the eNB, wherein the second subframe consists of resource elements arranged in frequency and time domain and the part of the first subframe and the part of the second subframe are received simultaneously;
obtain a first Cell State Information Reference Signal (CSI-RS) from a first resource element of the first subframe;
obtain a second CSI-RS from a second resource element of the first subframe, wherein the first resource element and the second resource element are adjacent to each other;
obtain a third CSI-RS from a third resource element of the second subframe;
obtain a fourth CSI-RS from a fourth resource element of the second subframe;
measure channel state at least based on one of the first CSI-RS, the second CSI-RS, the third CSI-RS and the fourth CSI-RS;
and
cause the apparatus to transmit the measured channel state to the eNB,
wherein a location of the first resource element in the first subframe in frequency and time domain is same as a location of the third resource element in the second subframe in frequency and time domain;
and
a location of the second resource element in the first subframe in frequency and time domain is same as a location of the fourth resource element in the second subframe in frequency and time domain.

13 more elements

A device for a user equipment (UE), comprising:

a memory;
and
a processor,
wherein the processor, when executing program instructions stored in the memory, is configured to:
cause the UE to receive at least a part of a first subframe from an eNB, wherein the first subframe consists of resource elements arranged in frequency and time domain;
cause the UE to receive at least a part of a second subframe from the eNB, wherein the second subframe consists of resource elements arranged in frequency and time domain and the part of the first subframe and the part of the second subframe are received simultaneously;
obtain a first Cell State Information Reference Signal (CSI-RS) from a first resource element of the first subframe;
obtain a second CSI-RS from a second resource element of the first subframe, wherein the first resource element and the second resource element are adjacent to each other;
obtain a third CSI-RS from a third resource element of the second subframe;
obtain a fourth CSI-RS from a fourth resource element of the second subframe;
measure channel state at least based on one of the first CSI-RS, the second CSI-RS, the third CSI-RS and the fourth CSI-RS;
and
cause the UE to transmit the measured channel state to the eNB,
wherein a location of the first resource element in the first subframe in frequency and time domain is same as a location of the third resource element in the second subframe in frequency and time domain;
and
a location of the second resource element in the first subframe in frequency and time domain is same as a location of the fourth resource element in the second subframe in frequency and time domain.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/285,957Filed 26 Feb 2019 · continuation
Priority: KR 10-2010-000421918 Jan 2010
Published: US 2019/0260554 A122 Aug 2019
Granted: 18 Feb 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

H04L 5/0057
Allocation of signalling, i.e. of overhead other than pilot signals: physical resource allocation for CQI
H04B 7/06
Using two or more spaced independent antennas: at the transmitting station
H04B 7/08
Using two or more spaced independent antennas: at the receiving station
H04B 7/0817
Using antenna selection: with multiple receivers and antenna path selection

Family

Application13/008,685Parent of this continuation · filed 18 Jan 2011
Application14/043,005Parent of this continuation · filed 1 Oct 2013
US 8,576,822 B2Parent of this continuation · filed 5 Nov 2013
Application14/464,041Parent of this continuation · filed 20 Aug 2014
US 8,837,452 B2Parent of this continuation · filed 16 Sep 2014
Application15/192,233Parent of this continuation · filed 24 Jun 2016
US 9,380,581 B2Parent of this continuation · filed 28 Jun 2016
Application15/858,921Parent of this continuation · filed 29 Dec 2017
US 9,893,866 B2Parent of this continuation · filed 13 Feb 2018
US 10,218,485 B2Parent of this continuation · filed 26 Feb 2019
US 2019/0260554 A1Pre-grant publication · published 22 Aug 2019
US 2011/0176634 A1Published application
US 2014/0029696 A1Published application
US 2014/0355711 A1Published application
US 2016/0373231 A1Published application
US 2018/0139029 A1Published application
US 10,567,140 B2This patent

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