Method and apparatus for coordinated multi-node transmission

Patent metadata

Field	Value
Publication number	US-9385853-B2
Application number	US-201414202537-A
Country	US
Kind code	B2
Filing date	Mar 10, 2014
Priority date	Sep 10, 2011
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

Embodiments of the present invention provide a method and an apparatus for coordinated multi-node transmission The method includes: acquiring, by a user equipment, channel state indicator information of each coordinating node; feeding back, by the user equipment, all information or a part of information in the acquired channel state indicator information to a base station, so that each coordinating node performs, according to the channel state indicator information that has been fed back, scheduling on the user equipment and/or one or more other user equipments served by each coordinating node; and if the user equipment is scheduled, receiving, by the user equipment, scheduling result notification information sent by the base station, and receiving, by the user equipment according to the scheduling result notification information, data transmitted by a base station that corresponds to a coordinating node serving the user equipment. The present invention is applicable to a radio communications system.

First claim

What is claimed is:

1. A method for coordinated multi-node transmission, the method comprising:
acquiring, by a user equipment, channel state indicator information of each coordinating node;
feeding back, by the user equipment, at least some information in the acquired channel state indicator information to a base station, so that each coordinating node performs, according to the channel state indicator information that has been fed back, scheduling on the user equipment and/or one or more other user equipment served by each coordinating node; and
if the user equipment is scheduled:
receiving, by the user equipment, scheduling result notification information sent by the base station; and
receiving, by the user equipment according to the scheduling result notification information, data transmitted by a base station that corresponds to a coordinating node serving the user equipment;

wherein acquiring, by the user equipment, the channel state indicator information of each coordinating node comprises:
measuring, by the user equipment, a channel state of each coordinating node, and performing interference compensation on the measured channel state; and
acquiring, by the user equipment, the channel state indicator information of each coordinating node according to the channel state on which the interference compensation has been performed;

wherein:
the channel state indicator information comprises channel quality indicator information;
measuring, by the user equipment, the channel state of each coordinating node, and performing interference compensation on the measured channel state comprises:
measuring, by the user equipment, interference on a first-category resource element, wherein the first-category resource element is a resource element at the same location as an interference reference signal of a coordinating node to be measured, and the coordinating node to be measured is a coordinating node whose channel state is to be measured;
acquiring, by the user equipment, a location of a second-category resource element, wherein the second-category resource element comprises at least a part of resource elements apart from the first-category resource element;
measuring, by the user equipment, interference on the second-category resource element; and
obtaining, by the user equipment, equivalent interference according to the interference on the first-category resource element and the interference on the second-category resource element; and

acquiring, by the user equipment, the channel state indicator information of each coordinating node according to the channel state on which the interference compensation has been performed comprises:
acquiring, by the user equipment according to the equivalent interference, channel quality indicator information of the coordinating node to be measured.

2. The method according to claim 1 , wherein:
the second-category resource element is a resource element that suffers heavy interference from one or more other coordinating nodes or a resource element that suffers interference at an intensity an absolute value of a difference between which and an intensity of interference suffered by the first-category resource element is greater than a certain threshold; and
the heavily-interfering coordinating node is at least one node that is among all coordinating nodes apart from the coordinating node to be measured and whose receive power value, for the user equipment, is greater than receive power values of the other coordinating nodes.

3. The method according to claim 1 , wherein before acquiring, by a user equipment, channel state indicator information of each coordinating node, the method further comprises:
receiving, by the user equipment, measurement indicator information sent by the base station, wherein the measurement indicator information is used to indicate whether the user equipment performs interference compensation on the measured channel state.

4. The method according to claim 1 , wherein before acquiring, by a user equipment, channel state indicator information of each coordinating node, the method further comprises:
receiving, by the user equipment, interference compensation resource information sent by the base station, wherein the interference compensation resource information is used to indicate interfering-node indicator information or a location of a resource for the user equipment to perform interference compensation; and
measuring, by the user equipment, a channel state of each coordinating node, and performing interference compensation on the measured channel state comprises:
measuring, by the user equipment, the channel state of each coordinating node, and performing interference compensation on the measured channel state of a coordinating node or of the resource indicated in the interference compensation resource information.

5. The method according to claim 1 , further comprising:
receiving, by the user equipment, selection reference parameters sent by the base station, wherein the selection reference parameters are mapped to a part of nodes or all of nodes among all coordinating nodes; and
when the selection reference parameters are mapped to a part of nodes among all the coordinating nodes, for a coordinating node that does not have a corresponding selection reference parameter, determining, by the user equipment, 0 or a predefined value as its selection reference parameter;
after acquiring, by a user equipment, channel state indicator information of each coordinating node and before the feeding back, by the user equipment, at least some information in the acquired channel state indicator information to a base station, the method further comprises:
selecting, by the user equipment according to the selection reference parameters and from the acquired channel state indicator information of each coordinating node, channel state indicator information that needs to be fed back to the base station; and

feeding back, by the user equipment, at least some information in the acquired channel state indicator information to a base station comprises:
feeding back, by the user equipment, the selected channel state indicator information to the base station.

6. The method according to claim 5 , further comprising:
feeding back, by the user equipment to the base station, at least one of a resource identifier and a node identifier that correspond to the selected channel state indicator information.

7. A method for coordinated multi-node transmission, the method comprising:
acquiring, by a user equipment, channel state indicator information of each coordinating node;
feeding back, by the user equipment, at least some information in the acquired channel state indicator information to a base station, so that each coordinating node performs, according to the channel state indicator information that has been fed back, scheduling on the user equipment and/or one or more other user equipment served by each coordinating node;
if the user equipment is scheduled:
receiving, by the user equipment, scheduling result notification information sent by the base station; and
receiving, by the user equipment according to the scheduling result notification information, data transmitted by a base station that corresponds to a coordinating node serving the user equipment;

receiving, by the user equipment, selection reference parameters sent by the base station, wherein the selection reference parameters are mapped to a part of nodes or all of nodes among all coordinating nodes; and
when the selection reference parameters are mapped to a part of nodes among all the coordinating nodes, for a coordinating node that does not have a corresponding selection reference parameter, determining, by the user equipment, 0 or a predefine

Assignees

• Huawei Tech Co Ltd

Inventors

• Zhou Yongxing
• Sun Jingyuan
• Xia Liang
• Mazzarese David
• Zhou Mingyu
• Ren Xiaotao
• Zhang Jiayin

Classifications

• H04W72/54

  based on quality criteria · CPC title

• H04L5/0073 Primary

  Allocation arrangements that take into account other cell interferences · CPC title

• H04W72/1226

  Electricity · mapped topic

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04B7/024 Primary

  Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems · CPC title