CN102468933A

CN102468933A - Method, device and system for feeding back channel state information

Info

Publication number: CN102468933A
Application number: CN2011100041845A
Authority: CN
Inventors: 马莎; 白伟; 薛丽霞; 余政; 郑娟
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2010-11-15
Filing date: 2011-01-10
Publication date: 2012-05-23
Anticipated expiration: 2031-01-10
Also published as: CN102468933B; WO2012065579A3; WO2012065579A2

Abstract

An embodiment of the invention discloses a method, a device and a system for feeding back channel state information, relating to the technical field of communication. For obtaining the channel condition on different interference subframes between a base station and user equipment by the substation, the invention provides a technical proposal as follows: transmitting CSI feedback indicating information to the user equipment by the base station through an uplink scheduling signalling and/or an RRC signalling; and then receiving CSI on the subframe of the first type and/or the second type transmitted by the user equipment according to the CSI feedback indicating information. The method, device and system disclosed by the invention are applied to schedule radio communication data.

Description

Feedback method, device and system of channel state information

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for feeding back channel state information.

Background

In wireless communication systems such as LTE (Long Term Evolution), LTE-a (Long Term Evolution-Advanced), and the like, in order to meet or improve one or more performance requirements of the system, a heterogeneous network (heterogeneous network) technology may be employed, that is, a plurality of base stations of the same system but different types or base stations of different systems are deployed within the same coverage area, so as to enhance network coverage and improve system capacity.

For example, MeNB (Macro eNodeB, Macro base station) and LPN (low power node, low power base station) are deployed in a heterogeneous network, where MeNB is a large transmission power base station and LPN is a base station that uses the same scheme as MeNB but has low transmission power. The uplink and downlink spectrum resources of the LPN and the uplink and downlink spectrum resources of the MeNB may be completely or partially spectrum-multiplexed to improve spectrum utilization efficiency. However, when the LPN and the MeNB multiplex uplink and downlink spectrum resources, a problem occurs in that uplink (or downlink) channels of the LPN and the MeNB interfere with each other, and reliability of transmission and detection of the uplink and downlink channels of the LPN and the MeNB is affected. Base stations in the heterogeneous network may be divided into an interfering base station and an interfered base station according to the transmission power or other conditions, for example, due to the difference in the transmission power between the MeNB and the LPN, the MeNB serves as the interfering base station and the LPN serves as the interfered base station for downlink control and data transmission.

In order to protect the downlink channel transmission of the interfered base station cell, the interfering base station cell may configure some downlink subframes of its own cell as ABS (Almost Blank Subframe) or MBSFN (Multicast Broadcast single frequency Network) subframes for interference coordination, so as to mitigate the interference to the downlink channel of the interfered base station cell. At this time, the downlink subframe of the interfered base station which is interference protected by the interfering base station may be referred to as a low interference subframe, that is, the low interference subframe corresponds to the downlink subframe of the interfering base station which is configured to be an approximately blank subframe or an MBSFN subframe, and the downlink subframe of the interfered base station which is not interference protected by the interfering base station may be referred to as a normal interference subframe.

Therefore, the interfered base station can schedule UEs (user equipments) with strong interference from neighboring cells on low-interference subframes to ensure reliable transmission of control channels and data channels of the UEs. And, the UE which is not interfered by the adjacent cell or is interfered by the adjacent cell with low frequency is scheduled on the normal interference subframe, so as to improve the utilization efficiency of the system resource.

In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: the base station needs to be able to know the channel conditions between the base station and the user equipment on the low interference subframe and the normal interference subframe to achieve reasonable scheduling of data of each subframe type. How to know the channel conditions between the base station and the user equipment on the low interference subframe and the normal interference subframe is a problem to be solved urgently at present.

Disclosure of Invention

Embodiments of the present invention provide a method, an apparatus, and a system for feeding back channel state information, so that a base station can obtain channel conditions between the base station and a user equipment on different interference subframes.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

a method for feeding back channel state information, comprising:

sending CSI feedback indication information to user equipment through uplink scheduling signaling and/or RRC signaling;

and receiving CSI on the first type subframe and/or the second type subframe sent by the user equipment according to the CSI feedback indication information.

A base station, comprising:

a sending unit, configured to send CSI feedback indication information to the ue through an uplink scheduling signaling and/or an RRC signaling;

and the receiving unit is used for receiving the CSI sent by the user equipment according to the CSI feedback indication information on the first type subframe and/or the second type subframe.

A method for feeding back channel state information, comprising:

acquiring CSI feedback indication information from a base station through uplink scheduling signaling and/or RRC signaling;

and sending CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information.

A user equipment, comprising:

an obtaining unit, configured to obtain CSI feedback indication information from a base station through an uplink scheduling signaling and/or an RRC signaling;

and the sending unit is used for sending the CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information.

A system for feedback of channel state information, comprising:

the base station is used for sending CSI feedback indication information to the user equipment through uplink scheduling signaling and/or RRC signaling; receiving CSI on a first type subframe and/or a second type subframe sent by the user equipment according to the CSI feedback indication information;

the user equipment is used for acquiring CSI feedback indication information from the base station through uplink scheduling signaling and/or RRC signaling; and sending CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information.

According to the method, the device and the system for feeding back the channel state information, the base station sends CSI feedback indication information to the user equipment through the uplink scheduling signaling and/or the RRC signaling, and the user equipment sends CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information. Therefore, the base station can know the channel conditions between the base station and the user equipment on the first type subframe and the second type subframe, and reasonable scheduling of data is achieved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic flowchart of a method for feeding back channel state information according to an embodiment of the present invention;

fig. 2 is a schematic flowchart of another method for feeding back channel state information according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating another method for feeding back channel state information according to an embodiment of the present invention;

fig. 4 is a flowchart illustrating another method for feeding back channel state information according to an embodiment of the present invention;

fig. 5 is a flowchart illustrating another method for feeding back channel state information according to an embodiment of the present invention;

fig. 6 is a flowchart illustrating another method for feeding back channel state information according to an embodiment of the present invention;

fig. 7 is a flowchart illustrating another method for feeding back channel state information according to an embodiment of the present invention;

fig. 8 is a flowchart illustrating another method for feeding back channel state information according to an embodiment of the present invention;

fig. 9 is a flowchart illustrating another method for feeding back channel state information according to an embodiment of the present invention;

fig. 10 is a flowchart illustrating another method for feeding back channel state information according to an embodiment of the present invention;

fig. 11 is a flowchart illustrating another method for feeding back channel state information according to an embodiment of the present invention;

fig. 12 is a flowchart illustrating another method for feeding back channel state information according to an embodiment of the present invention;

fig. 13 is a schematic diagram illustrating a configuration of a base station according to an embodiment of the present invention;

fig. 14 is a schematic diagram of a base station according to a thirteenth embodiment of the present invention;

fig. 15 is a schematic configuration diagram of a feedback system of channel state information according to a fourteenth embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Although the LTE and LTE-a wireless communication systems are taken as examples in the embodiments of the present invention for explanation, the method, apparatus and system claimed in the present invention are also applicable to other wireless communication systems such as CDMA, GSM, EDGE, WCDMA, WLAN and WiMAX.

For convenience of description, in the embodiments of the present invention, subframes are divided into two types of subframes, i.e., first type subframes and second type subframes. The first type of subframe and the second type of subframe have different interference levels, and subframes belonging to the first type of subframe have similar interference levels, and subframes belonging to the second type of subframe also have similar interference levels. For example, the first type subframe is taken as one of a low interference subframe and a normal interference subframe, and the second type subframe is taken as the other of the low interference subframe and the normal interference subframe. In addition, the embodiment of the present invention is not limited to performing measurement feedback on CSI (Channel state information) of the first type subframe and the second type subframe, and may also be used for CSI measurement feedback of subframes adopting other classification manners.

In order to enable a base station to know channel conditions between the base station and a user equipment on different interference subframes, an embodiment of the present invention provides a method for feeding back channel state information, as shown in fig. 1, including:

101. a base station sends CSI feedback indication information to user equipment through uplink scheduling signaling and/or RRC (Radio Resource Control) signaling;

wherein, the content of the RRC signaling is carried in a PDSCH (Physical Downlink shared Channel), and the content of the uplink scheduling signaling UL grant is carried in a PDCCH (Physical Downlink Control Channel). The length of the uplink scheduling signaling is one bit or more than one bit.

For example, when the base station notifies the UE to measure and feed back CSI on the subframe of the corresponding type through RRC signaling, the base station may send RRC signaling including a first periodic CSI feedback parameter and a second periodic CSI feedback parameter to the UE, where the first periodic CSI feedback parameter is used to indicate periodic CSI feedback and a feedback mode of the first type subframe or not to perform periodic CSI feedback of the first type subframe, and the second periodic CSI feedback parameter is used to indicate periodic CSI feedback and a feedback mode of the second type subframe or not to perform periodic CSI feedback of the second type subframe. The CSI of the first type subframe and the CSI of the second type subframe are fed back to the base station periodically.

Or, the base station may also send, to the user equipment, an RRC signaling including a third periodic CSI feedback parameter and a subframe type indicator, where the subframe type indicator is used to indicate a subframe type for performing periodic CSI feedback, and the third periodic CSI feedback parameter is used to indicate a feedback mode or not perform periodic CSI feedback.

Or, the base station may further send an RRC signaling message including a fourth periodic CSI feedback parameter to the user equipment, where the fourth periodic CSI feedback parameter is used to indicate periodic CSI feedback for the first type subframe and the second type subframe and a feedback mode thereof.

When the base station informs the UE of measuring and feeding back the CSI on the subframe of the corresponding type through the UL grant and the RRC signaling, the base station can send the UL grant containing a feedback indication identifier to the user equipment, and send the RRC signaling containing a first aperiodic CSI feedback parameter and a second aperiodic CSI feedback parameter to the user equipment, wherein the feedback indication identifier is used for indicating to perform CSI feedback, the first aperiodic CSI feedback parameter is used for indicating to perform aperiodic CSI feedback and a feedback mode of the subframe of the first type, or not to perform aperiodic CSI feedback of the subframe of the first type, and the second aperiodic CSI feedback parameter is used for performing aperiodic CSI feedback and a feedback mode of the subframe of the second type, or not to perform aperiodic CSI feedback of the subframe of the second type. The CSI of the first type subframe and the CSI of the second type subframe are fed back to the base station in a burst manner.

Or, the base station may also send a ul grant including a feedback indication identifier to the ue, and send an RRC signaling including a third aperiodic CSI feedback parameter and a subframe type indication identifier to the ue, where the feedback indication identifier is used to indicate CSI feedback, the subframe type indication identifier is used to indicate a subframe type for aperiodic CSI feedback, and the third aperiodic CSI feedback parameter is used to indicate a feedback mode or not for aperiodic CSI feedback.

Or, the base station may further send a UL grant including a feedback indication identifier to the ue, and send an RRC signaling including a fourth aperiodic CSI feedback parameter to the ue, where the feedback indication identifier is used to indicate CSI feedback, and the fourth aperiodic CSI feedback parameter is used to indicate aperiodic CSI feedback and a feedback mode thereof on the first-type subframe and the second-type subframe.

When the base station informs the UE to measure and feed back CSI on subframes of corresponding types through the UL grant, the base station may send the UL grant including the first feedback indication identifier to the user equipment on a subframe of the first type, where the UL grant including the first feedback indication identifier is used to indicate aperiodic CSI feedback of the subframe of the first type; or sending a UL grant containing a first feedback indication identifier to the user equipment on the second type subframe, where the UL grant containing the first feedback indication identifier is used to indicate that aperiodic CSI feedback of the first type subframe and the second type subframe is performed.

In addition, when the base station notifies the UE to measure and feed back the corresponding CSI through the UL grant and the RRC signaling, the base station may further send the UL grant including the second feedback indication identifier to the user equipment on the first type subframe, where the UL grant including the second feedback indication identifier is used to indicate that aperiodic CSI feedback of the first type subframe is performed; or sending a UL grant containing a second feedback indication identifier to the user equipment on a second type subframe, and sending an RRC signaling containing subframe type indication information to the user equipment; the UL grant including the second feedback indication identifier and the subframe type indication information are used to indicate aperiodic CSI feedback of the second type subframe or the first type subframe and the second type subframe.

In a carrier aggregation scenario, a base station may send a UL grant including feedback indication information to a user equipment, where the feedback indication information is used to indicate that the user equipment performs aperiodic CSI feedback according to a primary carrier and a subframe type on the primary carrier, or a carrier in a first RRC signaling and a subframe type on the carrier, or a carrier in a second RRC signaling and a subframe type on the carrier. Sending first RRC signaling and second RRC signaling containing carriers and subframe types on the carriers to user equipment.

In addition, when only one downlink carrier exists between the base station and the user equipment, the base station may send a UL grant including a subframe type identifier to the user equipment, where the subframe type identifier is used to indicate a subframe type for aperiodic CSI feedback, and the length of the UL grant is more than one bit.

In this embodiment, a feedback time difference D > a feedback time difference T, where the feedback time difference D is a difference between a transmission time of aperiodic CSI corresponding to a subframe type without periodic CSI feedback and a reception time of the uplink scheduling signaling, and the feedback time difference T is a difference between a transmission time of aperiodic CSI corresponding to a subframe type with periodic CSI feedback and a reception time of the uplink scheduling signaling.

The base station may also send feedback location information of the first type subframe and/or the second type subframe to the user equipment, where the feedback location information includes the feedback time difference D.

102. And the base station receives CSI on the first type subframe and/or the second type subframe sent by the user equipment according to the CSI feedback indication information.

In the feedback method of the channel state information in this embodiment, a base station sends CSI feedback indication information to a user equipment through an uplink scheduling signaling and/or an RRC signaling, and receives CSI on a first type subframe and/or a second type subframe sent by the user equipment according to the CSI feedback indication information. Therefore, the base station can know the channel conditions between the base station and the user equipment on the first type subframe and the second type subframe, and reasonable scheduling of data is achieved.

Correspondingly to the previous embodiment, an embodiment of the present invention further provides a method for feeding back channel state information, as shown in fig. 2, including:

201. the user equipment acquires CSI feedback indication information from the base station through uplink scheduling signaling and/or RRC signaling;

202. and the user equipment sends the CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information.

For example, when the UE sends the periodic CSI to the base station according to the CSI feedback indication information in the RRC signaling sent by the base station, the UE may send the periodic CSI on the first type subframe to the base station when determining that only the first periodic CSI feedback parameter in the RRC signaling is valid, send the periodic CSI on the second type subframe to the base station when determining that only the second periodic CSI feedback parameter in the RRC signaling is valid, and send the periodic CSI on the first type subframe and the periodic CSI on the second type subframe to the base station when determining that the first periodic CSI feedback parameter and the second periodic CSI feedback parameter in the RRC signaling are valid; or when determining that the third periodic CSI feedback parameter in the RRC signaling is valid, the UE may also determine to perform periodic CSI feedback on the first type subframe or the second type subframe according to the subframe type indication identifier in the RRC signaling, and send the periodic CSI on the first type subframe or the second type subframe to the base station according to the third periodic CSI feedback parameter in the RRC signaling; or, the UE may further send periodic CSI on the first type subframe and the second type subframe to the base station according to the fourth periodic CSI feedback parameter when it is determined that the fourth periodic CSI feedback parameter in the RRC signaling is valid.

When the UE sends aperiodic CSI to the base station according to the UL grant sent by the base station and CSI feedback indication information in the RRC signaling, the UE may send aperiodic CSI on a first type subframe to the base station when determining that the UL grant includes a feedback indication identifier and only a first aperiodic CSI feedback parameter in the RRC signaling is valid; when determining that the UL grant contains a feedback indication identifier and only a second aperiodic CSI feedback parameter in RRC signaling is valid, sending aperiodic CSI on a second type subframe to the base station; when determining that the UL grant contains a feedback indication identifier and a first aperiodic CSI feedback parameter and a second aperiodic CSI feedback parameter in RRC signaling are both effective, sending aperiodic CSI on a first type subframe and a second type subframe to the base station; or, when determining that the UL grant includes the feedback indication identifier and the third aperiodic CSI feedback parameter in the RRC signaling is valid, the base station may determine to perform aperiodic CSI feedback on the first type subframe or the second type subframe according to the subframe type indication identifier in the RRC signaling, and send aperiodic CSI on the first type subframe or the second type subframe to the base station according to the third aperiodic CSI feedback parameter in the RRC signaling; or, the base station may further send aperiodic CSI on the first type subframe and the second type subframe to the base station according to a fourth aperiodic CSI feedback parameter when it is determined that the UL grant includes the feedback indication identifier and the fourth aperiodic CSI feedback parameter in the RRC signaling is valid.

When the UE sends aperiodic CSI to the base station according to CSI feedback indication information in a UL grant sent by the base station, the UE may send the aperiodic CSI on a first type subframe to the base station when it is determined that the UL grant received on the first type subframe includes a first feedback indication identifier; or when determining that the UL grant received on the second type subframe contains the first feedback indication identifier, sending aperiodic CSI on the first type subframe and the second type subframe to the base station.

In addition, when the UE sends aperiodic CSI to the base station according to the UL grant sent by the base station and the CSI feedback indication information in the RRC signaling, the UE may send the aperiodic CSI on the first type subframe to the base station when it is determined that the UL grant received on the first type subframe includes the second feedback indication identifier; or, when determining that the UL grant received on the second type subframe includes the second feedback indication identifier, the UE may determine to perform aperiodic CSI feedback on the second type subframe or the first type subframe and the second type subframe according to subframe type indication information in the received RRC signaling, and send the second type subframe or the aperiodic CSI on the first type subframe and the second type subframe to the base station.

In a carrier aggregation scenario, when determining that aperiodic CSI feedback is performed according to a primary carrier and a subframe type on a specified primary carrier according to feedback indication information in a UL grant, a UE may acquire the subframe type on the specified primary carrier and send aperiodic CSI on a subframe of the subframe type on the primary carrier to a base station; or, when determining to perform aperiodic CSI feedback according to the carrier in the first RRC signaling or the second RRC signaling and the subframe type on the carrier according to the feedback indication information in the UL grant, the UE may acquire the carrier and the subframe type on the carrier from the first RRC signaling or the second RRC signaling, and send aperiodic CSI of a subframe of the subframe type on the carrier to the base station.

When only one downlink carrier exists between the base station and the user equipment, the UE may determine the subframe type for aperiodic CSI feedback according to the subframe type identifier in the received UL grant, obtain whether the subframe type for aperiodic CSI feedback is a first type subframe or a second type subframe or both, and send aperiodic CSI of the subframe type to the base station.

Further, when the UE needs to send CSI on the first type subframe and the second type subframe at the same time and can only send CSI on one subframe type, determining priorities of CSI contents on the first type subframe and the second type subframe or priorities of the first type subframe and the second type subframe. The UE can send the CSI on the subframe of the subframe with high priority of the CSI content or the subframe type or the priority of the subframe type to the base station when the priority of the CSI content on the first type subframe is different from that of the second type subframe or the priority of the first type subframe is different from that of the second type subframe. And when the priority of the CSI content on the first type subframe and the priority of the CSI content on the second type subframe are the same, sending the CSI on the subframe with the specified type to the base station, or sending the CSI on the first type subframe or the second type subframe to the base station in turn.

In this embodiment, a feedback time difference D > a feedback time difference T, where the feedback time difference D is a difference between a transmission time of aperiodic CSI corresponding to a subframe type without periodic CSI feedback and a reception time of the uplink scheduling signaling, and the feedback time difference T is a difference between a transmission time of aperiodic CSI corresponding to a subframe type with periodic CSI feedback and a reception time of the uplink scheduling signaling;

in addition, the UE may obtain feedback position information of the first type subframe and/or the second type subframe from an RRC signaling or a UL grant sent by the base station, or obtain a feedback position of the first type subframe and/or the second type subframe according to a specified subframe measurement number, or obtain preset feedback position information of the first type subframe and/or the second type subframe; and sending the aperiodic CSI on the first type subframe and/or the second type subframe to the base station according to the feedback position information.

In the feedback method of the channel state information, the user equipment acquires the CSI feedback indication information from the base station through the uplink scheduling signaling and/or the RRC signaling, and sends the CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information. Therefore, the base station can know the channel conditions between the base station and the user equipment on the first type subframe and the second type subframe, and reasonable scheduling of data is achieved.

In the above embodiment, the base station may notify the UE to measure and feed back the CSI of the corresponding subframe through the RRC signaling, may notify the UE to measure and feed back the CSI of the corresponding subframe through the UL grant, and may also notify the UE to measure and feed back the CSI of the corresponding subframe through the UL grant and the RRC signaling. And the base station can inform the UE of measuring and feeding back the periodic CSI of the corresponding subframe, and can also inform the UE of measuring and feeding back the aperiodic CSI of the corresponding subframe. In addition, the base station may acquire CSI fed back by the UE measurement in a carrier aggregation scenario, or may acquire CSI fed back by the UE measurement in a single carrier scenario. The above embodiments will be described in further detail with reference to the above different cases.

As shown in fig. 3, the method for feeding back channel state information in this embodiment includes:

301. a base station sends RRC signaling to UE, wherein the RRC signaling comprises a first periodic CSI feedback parameter and a second periodic CSI feedback parameter; the first periodic CSI feedback parameter is used for indicating periodic CSI feedback of a first type subframe and a feedback mode thereof, or not performing the periodic CSI feedback of the first type subframe, and the second periodic CSI feedback parameter is used for indicating periodic CSI feedback of a second type subframe and a feedback mode thereof, or not performing the periodic CSI feedback of the second type subframe.

For example, the base station may configure two CQI-reportperiod parameters in the CQI-ReportConfig message sent to the UE, which are respectively represented by CQI-reportperiod _1 and CQI-reportperiod _2, that is, the first periodic CSI feedback parameter and the second periodic CSI feedback parameter, where the sequence of CQI-reportperiod _1 and CQI-reportperiod _2 in the RRC signaling is fixed, and the CQI-reportperiod _1 parameter and CQI-reportperiod _2 parameter correspond to the first type subframe and the second type subframe, respectively. Wherein, the cqi-ReportPeriodic _1 parameter includes an indication field indicating whether the cqi-ReportPeriodic _1 parameter is released (release) or established (setup), and the cqi-ReportPeriodic _2 parameter includes an indication field indicating whether the cqi-ReportPeriodic _2 parameter is released or established. When the indicator field in the cqi-report _1 parameter or cqi-report _2 parameter indicates that the cqi-report _1 parameter or the cqi-report _2 parameter is in a release state, it indicates that the cqi-report _1 parameter or the cqi-report _2 parameter is invalid, and at this time, the UE does not need to perform periodic measurement feedback on the CSI of the first type subframe (or the measurement resource set of the first type subframe) or the second type subframe (or the measurement resource set of the second type subframe). And when the indicator field in the cqi-report _1 parameter or cqi-report _2 parameter indicates that the cqi-report _1 parameter or the cqi-report _2 parameter is in the establishment state, it indicates that the cqi-report _1 parameter or the cqi-report _2 parameter is valid, and at this time, the UE needs to perform periodic measurement feedback on the CSI of the first type subframe (or the measurement resource set of the first type subframe) or the second type subframe (or the measurement resource set of the second type subframe). Wherein, the setting code of the indication field for releasing and establishing the cqi-report periodic parameter can be as follows:

CQI-ReportConfig information elements

--ASN1START

CQI-Report Config::＝ SEQUENCE{

cqi-ReportModeAperiodic ENUMERATED{

rm12，rm20，rm22，rm30，rm31，

spare3，spare 2，spare1}

OPTIONAL， --Need OR

nomPDSCH-RS-EPRE-Offset INTEGER(-1..6)，

cqi-ReportPeriodic CQI-ReportPeriodic OPTIONAL

--Need ON

}

CQI-ReportConfig-v920::＝ SEQUENCE{

cqi-Mask-r9 ENUMERATED{setup} OPTIONAL，

--Cond cqi-Setup

pmi-RI-Report-r9 ENUMERATED{setup} OPTIONAL

--Cond PMIRI

}

CQI-Report Periodic::＝ CHOICE{

release NULL，

setup SEQUENCE{

cqi-PUCCH-ResourceIndex INTEGER(0..1185)，

cqi-pmi-ConfigIndex INTEGER(0..1023)，

cqi-FormatIndicatorPeriodic CHOICE{

widebandCQI NULL，

subbandCQI SEQUENCE{

k INTEGER(1..4)

}

}，

ri-ConfigIndex INTEGER (0..1023)

OPTIONAL， --Need OR

simultaneousAckNackAndCQI BOOLEAN

}

----ASN1STOP

302. after the UE receives the RRC signaling, the UE determines the subframe type for CSI feedback according to the first periodic CSI feedback parameter and the second periodic CSI feedback parameter in the RRC signaling, and periodically measures CSI on the subframe with the determined subframe type.

For example, after receiving the RRC signaling, the UE obtains cqi-reportperiod _1 parameter and cqi-reportperiod _2 parameter from the RRC signaling, determines whether an indication field in the cqi-reportperiod _1 parameter indicates a release state or a setup state, and determines whether an indication field in the cqi-reportperiod _2 parameter indicates a release state or a setup state. When the indication field in the cqi-reportperiod _1 parameter or the cqi-reportperiod _2 parameter indicates the release status, the UE considers the cqi-reportperiod _1 parameter or the cqi-reportperiod _2 parameter as invalid. And when the indication field in the cqi-ReportPeriodic _1 parameter or the cqi-ReportPeriodic _2 parameter indicates the setup status, the UE considers that the cqi-ReportPeriodic _1 parameter or the cqi-ReportPeriodic _2 parameter is valid. And the UE determines the subframe type needing to be fed back according to the effective cqi-report periodic parameter, and periodically measures the CSI on the subframe with the determined subframe type.

303. The UE sends periodic CSI on a subframe of the determined subframe type to the base station.

For example, when only the cqi-report _1 parameter is valid in RRC signaling, after measuring CSI of the first type subframe, the UE determines a PUCCH channel, CSI feedback content, and a feedback period used for feedback according to content of an indication field in the cqi-report _1 parameter, and sends CSI of the first type subframe to the base station on the PUCCH channel according to the CSI feedback content according to the feedback period. When only cqi-report periodic _2 parameter is valid in RRC signaling, after measuring CSI of the second type subframe, UE determines a PUCCH channel used for feedback, CSI feedback content and a feedback period according to the content of an indication field in cqi-report periodic _2 parameter, and sends CSI of the second type subframe to a base station on the PUCCH channel according to the CSI feedback content according to the feedback period. When cqi-report _1 parameter and cqi-report _2 parameter are simultaneously effective in RRC signaling, after measuring CSI of a first type subframe and a second type subframe, UE determines a PUCCH channel, CSI feedback content and a feedback period used for feedback according to the content of indication fields in the cqi-report _1 parameter and the cqi-report _2 parameter, and sends CSI of the first type subframe and the second type subframe to a base station on the PUCCH channel according to the CSI feedback content according to the feedback period.

In addition, when the cqi-reportperiod _1 parameter and the cqi-reportperiod _2 parameter are valid at the same time, the UE may be required to report periodic CSI of two different types of subframes at the same CSI feedback time. If the UE does not support reporting two periodic CSI at the same time, the UE may always drop feedback of the periodic CSI of one of the type subframes, so that the CSI feedback method of this embodiment may be flexibly applied to a UE supporting CSI feedback on one type subframe and a UE supporting CSI feedback on two type subframes.

For example, when the cqi-report _1 parameter and the cqi-report _2 parameter are valid at the same time, if the UE is required to report the periodic CSI of the first type subframe and the periodic CSI of the second type subframe at the same CSI feedback time, and the UE does not support reporting the two periodic CSI at the same time, it is considered that the CSI feedback on the first type subframe and the CSI on the second type subframe collide. At this time, the UE may obtain the priority of CSI content on the first type subframe and the second type subframe, or the priority of the first type subframe and the second type subframe. When the priority of the CSI content on the first type subframe and the priority of the CSI content on the second type subframe are different, the UE may send, to the base station, only the CSI on the subframe having the higher priority of the CSI content at the CSI feedback time. Under the condition that the priority of the CSI contents of the two types of subframes is the same, the UE can send the CSI on a certain type of specified subframe at the CSI feedback time, or alternately send the CSI on the first type of subframe or the CSI on the second type of subframe at the CSI feedback time.

In this embodiment, if CSI feedback on the first type subframe and the second type subframe collides, when the UE needs to feed back RI information on the first type subframe and simultaneously feeds back one or more of wideband PMI, subband PMI, wideband CQI, and subband CQI information on the second type subframe, the UE only feeds back RI information on the first type subframe to the base station; or when the UE needs to feed back the wideband PMI and/or wideband CQI information on the first type subframe and simultaneously feeds back the subband PMI and/or subband CQI information on the second type subframe, the UE only feeds back the wideband PMI and/or wideband CQI information on the first type subframe to the base station; or when the UE needs to feed back the RI information on the first-type subframe and simultaneously feeds back the RI information on the second-type subframe, the UE only feeds back the RI information on the first-type subframe to the base station; or when the UE needs to feed back the wideband PMI and/or wideband CQI information on the first type subframe and simultaneously feeds back the wideband PMI and/or wideband CQI information on the second type subframe, the UE only feeds back the wideband PMI and/or wideband CQI information on the first type subframe; or when the UE needs to feed back the sub-band PMI and sub-band CQI information on the first type sub-frame and simultaneously feeds back the sub-band PMI and sub-band CQI information on the second type sub-frame, the UE only feeds back the sub-band PMI and sub-band CQI information on the first type sub-frame.

In this embodiment, if the CSI feedback on the first type subframe and the CSI feedback on the second type subframe collide, when the priority of the first type subframe is higher than that of the second type subframe, the UE feeds back the CSI on the first type subframe.

In the feedback method of the channel state information of the embodiment, a base station sends CSI feedback indication information to user equipment through uplink scheduling signaling and/or RRC signaling, and the user equipment sends CSI on a first type subframe and/or a second type subframe to the base station according to the CSI feedback indication information. Therefore, the base station can know the channel conditions between the base station and the user equipment on the first type subframe and the second type subframe, and reasonable scheduling of data is achieved.

As shown in fig. 4, the method for feeding back channel state information in this embodiment includes:

401. the base station sends RRC signaling containing a third periodic CSI feedback parameter and a subframe type indication identifier to the user equipment, wherein the subframe type indication identifier is used for indicating the subframe type for periodic CSI feedback, and the third periodic CSI feedback parameter is used for indicating a feedback mode or not carrying out periodic CSI feedback;

for example, when the base station always only needs the UE to feed back the periodic CSI on a type subframe, only one CQI-ReportPeriodic parameter may be configured in the CQI-ReportConfig message, that is, the periodic CSI feedback parameter is the third periodic CSI feedback parameter, and 1 bit is additionally added as the subframe type indication identifier. For example, when the value of the subframe type indicator is 0, the periodic CSI feedback on the first type subframe is indicated, the content in the cqi-ReportPeriodic parameter corresponds to the first type subframe, when the value of the subframe type indicator is 1, the periodic CS I feedback on the second type subframe is indicated, and the content in the cqi-ReportPeriodic parameter corresponds to the second type subframe.

402. After the UE receives the RRC signaling, the UE determines the subframe type for periodic CSI feedback according to the subframe type indication mark in the RRC signaling, and measures CSI on a subframe with the determined subframe type;

for example, after the UE receives the RRC signaling, the UE determines the subframe type for periodic CSI feedback according to the value of the subframe type indicator in the RRC signaling. For example, when the value of the subframe type indicator is determined to be 0, the periodic feedback of the CSI on the first type subframe is determined, and the CSI on the first type subframe is measured, and when the value of the subframe type indicator is determined to be 1, the periodic feedback of the CSI on the second type subframe is determined, and the CSI on the second type subframe is measured.

403. And the UE sends the periodic CSI on the first type subframe or the second type subframe to the base station according to the third periodic CSI feedback parameter in the RRC signaling.

For example, when the UE determines to feed back the CSI on the first type subframe according to the subframe type indicator, the UE determines, according to the content of the indicator field in the cqi-reportperiod parameter, the PUCCH channel used for feedback, CSI feedback content, and a feedback period, and sends, according to the CSI feedback content, the CSI on the first type subframe to the base station on the PUCCH channel according to the feedback period. And when the UE determines to feed back the CSI on the second type subframe according to the subframe type indication identifier, determining a PUCCH channel used for feedback, CSI feedback content and a feedback period according to the content of an indication field in the cqi-report periodic parameter, and sending the CSI on the second type subframe to the base station on the PUCCH channel according to the CSI feedback content according to the feedback period.

And after the UE receives the RRC signaling containing cqi-report periodic parameter and subframe type indication identification, when the UE has received the RRC signaling containing cqi-report periodic parameter and subframe type indication identification before the RRC signaling, if the subframe type indication identifications in the RRC signaling received at the previous time and the next time indicate that the subframe types for CSI feedback are the same, the UE considers that the cqi-report periodic parameter in the newly received RRC signaling is valid, and sends periodic CSI to the base station according to the cqi-report periodic parameter in the newly received RRC signaling. If the subframe type indication identifier indicates that the subframe types for CSI feedback are different, the UE considers that cqi-report periodic parameters in the latest received RRC signaling and cqi-report periodic parameters in the previously received RRC signaling are both effective, and respectively sends periodic CSI to the base station according to cqi-report periodic parameters and the subframe type indication identifier in the successively received RRC signaling.

As shown in fig. 5, the method for feeding back channel state information in this embodiment includes:

501. the base station sends RRC signaling containing fourth periodical CSI feedback parameters to the user equipment, wherein the fourth periodical CSI feedback parameters are used for indicating periodical CSI feedback and a feedback mode of the first type subframe and the second type subframe.

For example, when the base station always requires the UE to feed back CSI on the first type subframe and the second type subframe at the same time, only one CQI-reportmodeadaptive parameter may be configured in the CQI-ReportConfig message.

502. And after the UE receives the RRC signaling, the UE carries out periodic measurement on the CSI of the first type subframe and the CSI of the second type subframe according to the fourth periodic CSI feedback parameter.

503. And the UE sends the CSI on the first type subframe and the second type subframe to the base station according to the fourth periodic CSI feedback parameter.

For example, the UE determines, according to the content in the cqi-ReportModeAperiodic parameter, a PUSCH channel and CSI feedback content used for feedback, and sends, according to the CSI feedback content, CSI on the PUSCH channel to the base station on the first type subframe and the second type subframe.

As shown in fig. 6, the method for feeding back channel state information in this embodiment includes:

601. and the base station sends an uplink scheduling signaling containing a feedback indication identifier to the user equipment, wherein the feedback indication identifier is used for indicating CSI feedback.

602. And after receiving the uplink scheduling signaling, the user equipment determines that CSI feedback is required according to the feedback indication identifier in the uplink scheduling signaling.

603. The base station sends RRC signaling containing a first aperiodic CSI feedback parameter and a second aperiodic CSI feedback parameter to the user equipment, wherein the first aperiodic CSI feedback parameter is used for indicating that aperiodic CSI feedback and a feedback mode of a first type subframe are carried out or that aperiodic CSI feedback of the first type subframe is not carried out, and the second aperiodic CSI feedback parameter is used for carrying out aperiodic CSI feedback and a feedback mode of a second type subframe or that aperiodic CSI feedback of the second type subframe is not carried out.

For example, the base station may configure two CQI-reportModeAperiodic parameters in the CQI-reportConfig message sent to the UE, which are respectively represented by CQI-reportModeAperiodic _1 and CQI-reportModeAperiodic _2, that is, the order of the CQI-reportModeAperiodic _1 and CQI-reportModeAperiodic _2 in the RRC signaling is fixed, and the CQI-reportModeAperiodic _1 parameter and CQI-reportModeAperiodic _2 parameter respectively correspond to the first type subframe and the second type subframe. The cqi-reportModeAperiodic _1 parameter includes an indication field indicating whether the cqi-reportModeAperiodic _1 parameter is to be released or established, and the cqi-reportModeAperiodic _2 parameter includes an indication field indicating whether the cqi-reportModeAperiodic _2 parameter is to be released or established. When the indicated field in the cqi-reportModeAperiodic _1 parameter or the cqi-reportModeAperiodic _2 parameter indicates that the cqi-reportModeAperiodic _1 parameter or the cqi-reportModeAperiodic _2 parameter is in a released state, it indicates that the cqi-reportModeAperiodic _1 parameter or the cqi-reportModeAperiodic _2 parameter is invalid, and at this time, the UE does not need to perform aperiodic measurement feedback on CSI of the first type subframe (or the measurement resource set of the first type subframe) or the second type subframe (or the measurement resource set of the second type subframe). And when the indicated field in the cqi-reportModeAperiodic _1 parameter or the cqi-reportModeAperiodic _2 parameter indicates that the cqi-reportModeAperiodic _1 parameter or the cqi-reportModeAperiodic _2 parameter is in the establishment state, it indicates that the cqi-reportModeAperiodic _1 parameter or the cqi-reportModeAperiodic _2 parameter is valid, and the UE needs to perform aperiodic CSI measurement feedback on the first-type subframe (or the measurement resource set of the first-type subframe) or the second-type subframe (or the measurement resource set of the second-type subframe).

604. After the UE receives the RRC signaling, the UE determines the subframe type for aperiodic CSI feedback according to the first aperiodic CSI feedback parameter and the second aperiodic CSI feedback parameter in the RRC signaling, and measures CSI on the subframe with the determined subframe type.

For example, after receiving the RRC signaling, the UE obtains cqi-reportmodeadaptive _1 parameter and cqi-reportmodeadaptive _2 parameter from the RRC signaling, determines whether the indication field in the cqi-reportmodeadaptive _1 parameter indicates a release state or an established state, and determines whether the indication field in the cqi-reportmodeadaptive _2 parameter indicates a release state or an established state. When the indication field in the cqi-reportModeAperiodic _1 parameter or the cqi-reportModeAperiodic _2 parameter indicates a release state, the UE considers either the cqi-reportModeAperiodic _1 parameter or the cqi-reportModeAperiodic _2 parameter to be invalid. Whereas, when the indication field in the cqi-reportModeAperiodic _1 parameter or the cqi-reportModeAperiodic _2 parameter indicates an establishment state, the UE considers that the cqi-reportModeAperiodic _1 parameter or the cqi-reportModeAperiodic _2 parameter is valid. And the UE determines the subframe type needing aperiodic CSI feedback according to the effective cqi-reportModeAperiodic parameter, and measures the CSI on the subframe with the determined subframe type.

605. And the UE sends CSI on the subframe with the determined subframe type to the base station.

For example, when only the cqi-reportmodeadaptive _1 parameter is valid in RRC signaling, after measuring the CSI of the first-type subframe, the UE determines the PUSCH channel and the CSI feedback content used for feedback according to the content of the indication field in the cqi-reportmodeadaptive _1 parameter, and sends the CSI of the first-type subframe to the base station on the PUSCH channel according to the CSI feedback content. When only cqi-reportModeAperiodic _2 parameter is valid in RRC signaling, after measuring CSI of the subframe of the second type, the UE determines a PUSCH channel and CSI feedback content used for feedback according to the content of an indication field in the cqi-reportModeAperiodic _2 parameter, and sends CSI of the subframe of the second type to the base station on the PUSCH channel according to the CSI feedback content. When cqi-reportModeAperiodic _1 parameter and cqi-reportModeAperiodic _2 parameter are simultaneously effective in RRC signaling, after measuring CSI of a first type subframe and a second type subframe, the UE determines a PUSCH used for feedback and CSI feedback content according to the content of indication fields in the cqi-reportModeAperiodic _1 parameter and the cqi-reportModeAperiodic _2 parameter, and sends the CSI of the first type subframe and the second type subframe to the base station on the PUSCH according to the CSI feedback content.

In addition, assuming that the base station instructs the UE to periodically feed back the CSI on the first-type subframe according to the method described above, when the base station sends an RRC signaling including the first aperiodic CSI feedback parameter and the second aperiodic CSI feedback parameter to the UE, if the second aperiodic CSI feedback parameter is valid, the UE needs to feed back the aperiodic CSI of the second-type subframe to the base station. However, since the CSI on the first type subframe is periodically measured and fed back all the time, that is, the CSI on the first type subframe is continuously measured, and the CSI on the second type subframe is measured after the UE receives the uplink scheduling signaling, that is, the UE needs to spend a certain time to measure the channel information, especially the interference information, on the second type subframe to obtain the measurement result, the aperiodic CSI reporting time corresponding to the second type subframe lags behind the aperiodic CSI reporting time of the first type subframe. In this way, when the UE aperiodically feeds back CSI on the first type subframe, assuming that the base station triggers the UE to feed back CSI on the second type subframe through one UL grant, a time difference between a time point of transmitting the UL grant and a time point of feeding back CSI on the first type subframe by the UE is T, for example, the time difference T is usually 4 milliseconds in an FDD system, may be 6 milliseconds during RACH, and is usually greater than 4 milliseconds in a TDD system, and a time difference between a time point of transmitting the UL grant and a time point of feeding back aperiodic CSI on the second type subframe by the UE is D, so D must be greater than T. The UE may perform channel measurements on one or more subframes of the second type within a time window between a time instant when the UL grant is transmitted to a time instant when the UE feeds back CSI on the subframes of the second type.

Assuming that the UE needs to feed back the CSI on the second-type subframe, the UE may feed back the CSI on the second-type subframe to the base station after a certain time after receiving the signaling triggering aperiodic CSI feedback, that is, the UE feeds back the CSI on the second-type subframe at positions of D subframes after receiving the signaling triggering aperiodic CSI feedback. Specifically, the D value can be obtained by the following three methods:

the method a, the base station informs the set D value information of the UE through RRC signaling or uplink scheduling signaling. The value D is given by the base station after comprehensive consideration according to factors such as the change situation of interference on the subframe of the second type, the density of the subframe of the second type, the requirement of service on the resource size of the subframe of the second type and the like.

And b, the UE determines the value of D. The number K of subframes required by channel measurement on the second type subframe is agreed between the base station and the UE, the UE starts to measure the second type subframe after receiving CSI measurement on the triggered second type subframe, the UE feeds back a measurement result after the K second type subframes are measured, and the subframe used at the moment is a feedback position. The method for the base station and the UE to agree the value of K can be obtained according to the relation between the precision required by interference averaging and the number of subframes, and the relation can be obtained by simulation.

In method c, it may be preset that the feedback position of the UE is D subframes after receiving the signaling triggering CSI measurement on the second type subframe, for example, D may be 8, 12, 16, or 20 or another fixed value.

As shown in fig. 7, the method for feeding back channel state information in this embodiment includes:

701. and the base station sends an uplink scheduling signaling containing a feedback indication identifier to the user equipment, wherein the feedback indication identifier is used for indicating to perform aperiodic CSI feedback.

702. And after receiving the uplink scheduling signaling, the user equipment determines that CSI feedback is required according to the feedback indication identifier in the uplink scheduling signaling.

703. The base station sends RRC signaling containing a third aperiodic CSI feedback parameter and a subframe type indicator to the user equipment, wherein the subframe type indicator is used for indicating the subframe type for carrying out aperiodic CSI feedback, and the third aperiodic CSI feedback parameter is used for indicating a feedback mode or not carrying out aperiodic CSI feedback;

for example, when the base station always only needs the UE to feed back CSI on a type subframe, only one CQI-ReportModeAperiodic parameter may be configured in the CQI-ReportConfig message, that is, the third aperiodic CSI feedback parameter, and at the same time, 1 bit is additionally added as the subframe type indicator. For example, when the value of the subframe type indicator is 0, the periodic CSI feedback on the first type subframe is indicated, the content in the cqi-reportmodeadaptive parameter corresponds to the first type subframe, when the value of the subframe type indicator is 1, the periodic CSI feedback on the second type subframe is indicated, and the content in the cqi-reportmodeadaptive parameter corresponds to the second type subframe.

704. After the UE receives the RRC signaling, the UE determines the subframe type needing aperiodic CSI feedback according to the subframe type indication mark in the RRC signaling, and measures CSI on the subframe with the determined feedback type

For example, after the UE receives the RRC signaling, the UE determines the subframe type that needs aperiodic CSI feedback according to the value of the subframe type indicator in the RRC signaling. For example, when the value of the subframe type indicator is determined to be 0, the aperiodic CSI on the first type subframe is determined to be fed back, and the aperiodic CSI on the first type subframe is measured, and when the value of the subframe type indicator is determined to be 1, the aperiodic CSI on the second type subframe is determined to be fed back, and the aperiodic CSI on the second type subframe is measured aperiodically.

705. And the user equipment sends the CSI on the subframe with the determined subframe type to the base station according to a third aperiodic CSI feedback parameter in the RRC signaling.

For example, when the UE determines to feed back the CSI on the first-type subframe according to the subframe type indicator, the UE determines the PUSCH channel and the CSI feedback content used for feedback according to the content in the cqi-ReportModeAperiodic parameter, and sends the CSI on the first-type subframe to the base station on the PUSCH channel according to the CSI feedback content. And when the UE determines to feed back the CSI on the subframe of the second type according to the subframe type indication identifier, determining a PUSCH (physical uplink shared channel) and CSI feedback content used for feedback according to the content in the cqi-reportModeAperiodic parameter, and sending the CSI on the subframe of the second type to the base station on the PUSCH according to the CSI feedback content.

In addition, when the UE needs to feed back CSI on the first type subframe or the second type subframe, the UE may also determine a feedback position according to the method in step 604, and feed back CSI on the first type subframe or the second type subframe to the base station at the feedback position.

As shown in fig. 8, the method for feeding back channel state information in this embodiment includes:

801. and the base station sends an uplink scheduling signaling containing a feedback indication identifier to the user equipment, wherein the feedback indication identifier is used for indicating CSI feedback.

802. And after receiving the uplink scheduling signaling, the user equipment determines that CSI feedback is required according to the feedback indication identifier in the uplink scheduling signaling.

803. And the base station sends RRC signaling containing a fourth aperiodic CSI feedback parameter to the user equipment, wherein the fourth aperiodic CSI feedback parameter is used for indicating the periodic CSI feedback of the first type subframe and the second type subframe and the feedback mode thereof.

804. And after the UE receives the RRC signaling, the UE performs aperiodic measurement on the CSI of the first type subframe and the CSI of the second type subframe according to the fourth aperiodic CSI feedback parameter.

805. And the UE sends the CSI on the first type subframe and the second type subframe to the base station according to the fourth aperiodic CSI feedback parameter.

In addition, when the UE needs to feed back CSI on the first type subframe and the second type subframe, the UE may also determine a feedback position according to the method in step 604, and feed back CSI on the first type subframe and the second type subframe to the base station at the feedback position.

As shown in fig. 9, the method for feeding back channel state information in this embodiment includes:

901. when the base station needs the UE to feed back the CSI on the first type subframe according to a protocol predefined mode, the base station sends an uplink scheduling signaling containing a first feedback indication mark to the user equipment on the first type subframe;

when the uplink scheduling signaling includes the first feedback indication identifier, the CQI request field information of the uplink scheduling signaling may include information such as a PUSCH channel used for feedback.

902. The UE receives an uplink scheduling signaling containing a first feedback indication identifier on a first type subframe, determines to feed back CSI on the first type subframe, and sends the CSI on the first type subframe to the base station;

for example, when the UE receives the uplink scheduling signaling including the first feedback indication identifier on the first type subframe, the UE determines to perform aperiodic CSI feedback on the first type subframe. And determining a PUSCH (physical uplink shared channel) and CSI (channel state information) feedback content used for feedback according to the CQI request field information of the uplink scheduling signaling, and sending the CSI on the first type subframe to the base station on the PUSCH according to the CSI feedback content.

903. And when the UE needs to feed back CSI on the first type subframe and the second type subframe, the base station sends an uplink scheduling signaling containing the first feedback indication identifier to the user equipment on the second type subframe.

904. And the user equipment receives an uplink scheduling signaling containing the first feedback indication identifier on the second type subframe, determines to feed back CSI on the first type subframe and the second type subframe, and sends the CSI on the first type subframe and the second type subframe to the base station.

For example, when the UE receives the uplink scheduling signaling including the first feedback indication identifier on the second type subframe, the UE determines to feed back CSI on the first type subframe and the second type subframe, determines, according to the CQI request field information of the uplink scheduling signaling, a PUSCH channel and CSI feedback content used for feedback, and sends, on the PUSCH channel, CSI on the first type subframe and the second type subframe to the base station according to the CSI feedback content.

As shown in fig. 10, the method for feeding back channel state information in this embodiment includes:

1001. and when the UE is required to feed back the CSI on the first type subframe, the base station sends an uplink scheduling signaling containing a second feedback indication identifier to the user equipment on the first type subframe.

Further, the base station may also send an RRC signaling including subframe type indication information to the UE after sending the uplink scheduling signaling including the second feedback indication identifier to the UE on the first type subframe, and indicate the UE to feed back CSI on the first type subframe or CSI on the first type subframe and the second type subframe by using the subframe type indication information.

1002. When the UE receives an uplink scheduling signaling containing a second feedback indication identifier on a first type subframe, the UE determines to feed back CSI on the first type subframe, and sends the CSI on the first type subframe to the base station according to the second feedback indication identifier;

1003. when the UE is required to feed back the CSI on the second type subframe, the base station sends an uplink scheduling signaling containing a second feedback indication identifier to the user equipment on the second type subframe, and sends an RRC signaling containing subframe type indication information to the user equipment, wherein the subframe type indication information indicates that the CSI on the second type subframe is fed back.

For example, when the UE needs to feed back CSI on the second type subframe, the base station sends a UL grant including the second feedback indication identifier to the UE on the second type subframe. Then, adding subframe type indication information in the RRC signaling, wherein the subframe type indication information only comprises one cqi-report configuration parameter, and sending the RRC signaling to the UE.

1004. The UE receives an uplink scheduling signaling containing a second feedback indication identifier on a second type subframe, receives an RRC signaling containing subframe type indication information, determines to perform aperiodic CSI feedback on the second type subframe according to the second feedback indication identifier and the subframe type indication information, and sends CSI on the second type subframe to the base station;

for example, the UE receives the UL grant including the second feedback indication identifier on the second type subframe. Receiving RRC signaling, and determining that the subframe type indication information in the RRC signaling only contains one cqi-report config parameter. And determining that aperiodic CSI feedback of a second type subframe needs to be performed according to the condition that the UL grant received on the second type subframe contains a second feedback indication identifier and the subframe type indication information only contains one cqi-report configuration parameter, measuring the channel condition on the second type subframe, and sending the measured CSI to the base station.

1005. When the UE is required to feed back CSI on the first type subframe and the second type subframe, the base station sends an uplink scheduling signaling containing a second feedback indication identifier to the user equipment on the second type subframe, and sends an RRC signaling containing subframe type indication information to the user equipment, wherein the subframe type indication information indicates that CSI on the first type subframe and the second type subframe is fed back.

For example, when the UE needs to feed back CSI on the first type subframe and the second type subframe, the base station sends a UL grant including a second feedback indication identifier to the UE on the second type subframe. Then, subframe type indication information is added in the RRC signaling, and the subframe type indication information includes two cqi-ReportConfig parameters, namely, cqi-ReportConfig _1 parameter and cqi-ReportConfig _2 parameter. And sending the RRC signaling to the UE.

1006. The UE receives an uplink scheduling signaling containing a second feedback indication mark on a second type subframe, receives an RRC signaling containing subframe type indication information, determines to perform aperiodic CSI feedback on the first type subframe and the second type subframe according to the second feedback indication mark and the subframe type indication information, and sends CSI on the first type subframe and the second type subframe to the base station;

for example, the UE receives the UL grant including the second feedback indication identifier on the second type subframe. Receiving RRC signaling, and determining that the subframe type indication information in the RRC signaling contains two cqi-report config parameters. And determining that aperiodic CSI feedback of a first type subframe and a second type subframe needs to be performed according to the fact that the ULgrant received on the second type subframe contains a second feedback indication identifier and the subframe type indication information contains two cqi-report configuration parameters, measuring CSI on the first type subframe and the second type subframe, and sending the measured CSI to the base station.

As shown in fig. 11, the method for feeding back channel state information in this embodiment includes:

1101. in a carrier aggregation scene, a base station sends an uplink scheduling signaling containing feedback indication information to user equipment, wherein the feedback indication information is used for indicating the user equipment to perform aperiodic CSI feedback according to a main carrier and a subframe type on the main carrier, or a carrier in a first RRC signaling and a subframe type on the carrier, or a carrier in a second RRC signaling and a subframe type on the carrier;

the feedback indication information is an aperiodic CSI feedback trigger field in the UL grant, and is used to indicate a carrier group corresponding to the aperiodic CSI feedback performed by the UE.

For example, in a carrier aggregation scenario, the base station sends a UL grant containing feedback indication information to the UE. The feedback indication information may be represented by two bits. For example, when no aperiodic CSI feedback is triggered, the value of the feedback indication information in the UL grant is set to 00, and the UL grant is transmitted to the UE. When aperiodic CS I feedback on only the primary carrier (primary serving cell) is triggered, the value of feedback indication information in the UL grant is set to 01, and the UL grant is transmitted to the UE. When the UE is required to determine a carrier group according to the first RRC signaling and perform aperiodic CSI feedback according to the carrier group, the value of feedback indication information in the UL grant is set to be 10, and the UL grant is sent to the UE. And when the UE is required to determine the carrier group according to the second RRC signaling and perform aperiodic CSI feedback according to the carrier group, setting the value of the feedback indication information in the UL grant as 11 and sending the UL grant to the UE.

1102. The base station sends first RRC signaling and second RRC signaling containing carriers and subframe types on the carriers to user equipment.

For example, when the base station sends the ul grant containing the feedback indication information value of 10 to the UE, the base station sends a first RRC signaling containing a carrier and a subframe type on the carrier to the UE. The RRC signaling pattern is, for example, { carrier 1 (first subframe type), carrier 3 (second subframe type) }, and the second RRC signaling pattern is { carrier 1 (second subframe type), carrier 2 (first subframe type and second subframe type) }. And when the base station sends the UL grant containing the feedback indication information value of 11 to the UE, sending a second RRC signaling containing a carrier and a subframe type on the carrier to the UE.

1103. After receiving an uplink scheduling signaling, user equipment acquires a specified subframe type on a main carrier and sends aperiodic CSI on a subframe of the subframe type on the main carrier to a base station when determining that aperiodic CSI feedback is carried out according to the main carrier and the specified subframe type on the main carrier according to feedback indication information in the uplink scheduling signaling; or when aperiodic CSI feedback is determined to be performed according to the carrier in the first RRC signaling or the second RRC signaling and the subframe type on the carrier according to the feedback indication information in the uplink scheduling signaling, acquiring the carrier and the subframe type on the carrier from the first RRC signaling or the second RRC signaling, and sending aperiodic CSI of the subframe type on the carrier to the base station.

For example, after receiving the UL grant with a value of 00 including the feedback indication information, the UE determines not to trigger any aperiodic CSI feedback according to the value of the feedback indication information.

After receiving the UL grant with a value of 01 including the feedback indication information, the UE determines to trigger only aperiodic CSI feedback on the primary carrier (primary serving cell) according to the value of the feedback indication information. At this time, the UE may acquire a feedback type of a predetermined subframe and transmit aperiodic CSI of the subframe of the feedback type on the primary carrier to the base station. For example, it is preset that aperiodic CSI feedback on a first type subframe is always triggered, and the UE sends aperiodic CSI of the first type subframe on a primary carrier to the base station. Alternatively, the UE may determine the subframe type of the feedback according to the UL grant. And after the subframe type of the feedback is determined, sending aperiodic CSI of the subframe with the determined feedback type on the main carrier to the base station.

After receiving the UL grant with the value of 10 including the feedback indication information, the UE determines, according to the value of the feedback indication information, to acquire carrier group information triggered by the UL grant from the first RRC signaling, that is, a carrier and a subframe type on the carrier. And after acquiring the carrier and the subframe type on the carrier from the first RRC signaling, the UE sends the aperiodic CSI of the subframe type on the carrier to the base station.

After receiving the UL grant with the value of 11 including the feedback indication information, the UE determines, according to the value of the feedback indication information, to acquire carrier group information triggered by the UL grant from the second RRC signaling, that is, a carrier and a subframe type on the carrier. And after acquiring the carrier and the subframe type on the carrier from the second RRC signaling, the UE determines a feedback carrier and a subframe feedback type, and sends aperiodic CSI of the subframe feedback type on the feedback carrier to the base station.

As shown in fig. 12, the method for feeding back channel state information in this embodiment includes:

1201. when only one downlink carrier exists between the base station and the UE, the base station sends an uplink scheduling signaling containing a subframe type identifier to the user equipment, wherein the subframe type identifier is used for indicating the subframe type for carrying out aperiodic CSI feedback.

The subframe type identifier is an aperiodic CSI feedback trigger field in the UL grant, and is used to indicate that the UE does not perform aperiodic CSI feedback, or performs aperiodic CSI feedback on a first type subframe, or performs aperiodic CSI feedback on a second type subframe, or performs aperiodic CS I feedback on the first type subframe and the second type subframe.

For example, two bits in the UL grant may be used to represent the subframe type identifier. For example, when aperiodic CS I feedback of any type of subframe is not triggered, the base station sets the value of the subframe type identifier in the UL grant to 00, and transmits the UL grant to the UE. When aperiodic CSI feedback on a first type subframe needs to be triggered, the base station sets the value of the subframe type identifier in the UL grant to 01, and sends the UL grant to the UE. And when the aperiodic CSI feedback on the second type subframe needs to be triggered, the base station sets the value of the subframe type identifier in the UL grant to 10, and sends the UL grant to the UE. When aperiodic CSI feedback on a first type subframe and a second type subframe needs to be triggered, a base station sets the value of a subframe type identifier in a UL grant to 11, and sends the UL grant to UE.

1202. After receiving the uplink scheduling signaling, the user equipment determines the subframe type for aperiodic CSI feedback according to the subframe type identifier in the uplink scheduling signaling, and sends CSI of the subframe with the determined subframe type to the base station.

For example, after receiving the UL grant sent by the base station, the UE determines the subframe type for aperiodic CSI feedback according to the two bit values identified by the subframe type in the UL grant, and sends CSI of the subframe type determined on the downlink carrier to the base station. For example, after receiving the UL grant sent by the base station, the UE determines that aperiodic CSI feedback of any type of subframe is not required when determining that the value of the subframe type identifier in the UL grant is 00. And when the value of the subframe type identifier in the UL grant is determined to be 01, determining that aperiodic CSI feedback of the first type subframe on the downlink carrier needs to be performed, and sending the aperiodic CSI of the first type subframe on the downlink carrier to a base station. And when the value of the subframe type identifier in the UL grant is determined to be 10, determining that aperiodic CSI of the second type subframe needs to be carried out, and sending aperiodic CSI feedback of the second type subframe to the base station. And when the value of the subframe type identifier in the UL grant is determined to be 11, determining that aperiodic CSI feedback on the first type subframe and the second type subframe needs to be performed, and sending aperiodic CSI on the first type subframe and the second type subframe to a base station.

Correspondingly to the above method, an embodiment of the present invention further provides a base station, as shown in fig. 13, including:

a sending unit 1301, configured to send CSI feedback indication information to a user equipment through an uplink scheduling signaling and/or an RRC signaling;

a receiving unit 1302, configured to receive CSI on a first type subframe and/or a second type subframe sent by the ue according to the CSI feedback indication information.

Further, the sending unit 1301 is specifically configured to send, to the ue, an RRC signaling that includes a first periodic CSI feedback parameter and a second periodic CSI feedback parameter, where the first periodic CSI feedback parameter is used to indicate performing periodic CSI feedback and a feedback mode of a first type subframe, or not performing periodic CSI feedback of the first type subframe, and the second periodic CSI feedback parameter is used to indicate performing periodic CSI feedback and a feedback mode of a second type subframe, or not performing periodic CSI feedback of the second type subframe; or,

sending RRC signaling containing a third periodic CSI feedback parameter and a subframe type indication identifier to user equipment, wherein the subframe type indication identifier is used for indicating the subframe type for periodic CSI feedback, and the third periodic CSI feedback parameter is used for indicating a feedback mode or not carrying out periodic CSI feedback; or,

and sending an RRC signaling message containing a fourth periodical CSI feedback parameter to the user equipment, wherein the fourth periodical CSI feedback parameter is used for indicating periodical CSI feedback of the first type subframe and the second type subframe and a feedback mode of the periodical CSI feedback.

Further, the sending unit 1301 specifically includes:

a scheduling signaling sending subunit, configured to send an uplink scheduling signaling including a second feedback indication identifier to a user equipment, where the second feedback indication identifier is used to indicate CSI feedback;

a high-level signaling sending subunit, configured to send, to a user equipment, an RRC signaling including a first aperiodic CSI feedback parameter and a second aperiodic CSI feedback parameter, where the first aperiodic CSI feedback parameter is used to indicate that aperiodic CSI feedback and a feedback mode of a first type subframe are performed or aperiodic CSI feedback of the first type subframe is not performed, and the second aperiodic CSI feedback parameter is used to perform aperiodic CSI feedback and a feedback mode of a second type subframe or aperiodic CSI feedback of the second type subframe is not performed; or sending RRC signaling containing a third aperiodic CSI feedback parameter and a subframe type indicator to the user equipment, wherein the subframe type indicator is used for indicating the subframe type for aperiodic CSI feedback, and the third aperiodic CSI feedback parameter is used for indicating the feedback mode or not carrying out aperiodic CSI feedback; or sending an RRC signaling containing a fourth aperiodic CSI feedback parameter to the user equipment, wherein the fourth aperiodic CSI feedback parameter is used for indicating the aperiodic CSI feedback of the first type subframe and the second type subframe and the feedback mode thereof.

Further, the sending unit 1301 is specifically configured to send an uplink scheduling signaling including a first feedback indication identifier to the ue on the first type subframe to indicate that aperiodic CSI feedback of the first type subframe is performed; or, sending an uplink scheduling signaling containing the first feedback indication identifier to the user equipment on the second type subframe to indicate that aperiodic CSI feedback of the first type subframe and the second type subframe is performed.

Further, the sending unit 1301 specifically includes:

a scheduling signaling sending subunit, configured to send, to the user equipment, an uplink scheduling signaling including a second feedback indication identifier on the first-type subframe, where the uplink scheduling signaling including the second feedback indication identifier is used to indicate aperiodic CSI feedback of the first-type subframe; or, sending an uplink scheduling signaling containing a second feedback indication identifier to the user equipment on the second type subframe;

a high-level signaling sending subunit, configured to send, to the user equipment, an RRC signaling that includes subframe type indication information when sending, to the user equipment, an uplink scheduling signaling that includes a second feedback indication identifier on a second type subframe; the uplink scheduling signaling containing the second feedback indication mark and the subframe type indication information are used for indicating the aperiodic CSI feedback of the second type subframe or the first type subframe and the second type subframe.

Further, the sending unit 1301 specifically includes:

a scheduling signaling sending subunit, configured to send, to a user equipment, an uplink scheduling signaling including feedback indication information, where the feedback indication information is used to indicate that the user equipment performs aperiodic CSI feedback according to a main carrier and a subframe type on the main carrier, or a carrier in a first RRC signaling and a subframe type on the carrier, or a carrier in a second RRC signaling and a subframe type on the carrier;

and the high-level signaling sending subunit is used for sending the first RRC signaling or the second RRC signaling containing the carrier and the subframe type on the carrier to the user equipment when the user equipment is required to perform aperiodic CSI feedback according to the carrier in the first RRC signaling or the second RRC signaling and the subframe type on the carrier.

Further, the sending unit 1301 is specifically configured to send, to the user equipment, an uplink scheduling signaling including a subframe type identifier when only one downlink carrier exists between the base station and the user equipment, where the subframe type identifier is used to indicate a subframe type for aperiodic CSI feedback.

Further, the sending unit 1301 is further configured to send feedback position information of the first type subframe and/or the second type subframe to the user equipment

Further, a feedback time difference D > a feedback time difference T, where the feedback time difference D is a difference between a transmission time of aperiodic CSI corresponding to a subframe type without periodic CSI feedback and a reception time of the uplink scheduling signaling, and the feedback time difference T is a difference between a transmission time of aperiodic CSI corresponding to a subframe type with periodic CSI feedback and a reception time of the uplink scheduling signaling;

Correspondingly to the above apparatus, an embodiment of the present invention further provides a user equipment, as shown in fig. 14, including:

an obtaining unit 1401, configured to obtain CSI feedback indication information from a base station through an uplink scheduling signaling and/or an RRC signaling;

a sending unit 1402, configured to send CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information.

Further, the sending unit 1402 is specifically configured to send periodic CSI on a first type subframe to the base station when it is determined that only a first periodic CSI feedback parameter in the RRC signaling is valid, send periodic CSI on a second type subframe to the base station when it is determined that only a second periodic CSI feedback parameter in the RRC signaling is valid, and send periodic CSI on the first type subframe and the second type subframe to the base station when it is determined that the first periodic CSI feedback parameter and the second periodic CSI feedback parameter in the RRC signaling are valid; or,

when determining that a third periodic CSI feedback parameter in an RRC signaling is valid, determining periodic CSI feedback of a first type subframe or a second type subframe according to a subframe type indication identifier in the RRC signaling, and sending periodic CSI on the first type subframe or the second type subframe to the base station according to the third periodic CSI feedback parameter in the RRC signaling; or,

and when determining that a fourth periodic CSI feedback parameter in an RRC signaling is valid, sending periodic CSI on the first type subframe and the second type subframe to the base station according to the fourth periodic CSI feedback parameter.

Further, the sending unit 1402 includes:

an identifier determining subunit, configured to determine whether the uplink scheduling signaling includes a feedback indication identifier;

the information sending subunit is configured to send, to the base station, aperiodic CSI on a first-type subframe when it is determined that the uplink scheduling signaling includes a feedback indication identifier and only a first aperiodic CSI feedback parameter in the RRC signaling is valid; when the uplink scheduling signaling is determined to contain the feedback indication identifier and only a second aperiodic CSI feedback parameter in the RRC signaling is effective, sending aperiodic CSI on a second type subframe to the base station; when it is determined that the uplink scheduling signaling contains a feedback indication identifier and a first aperiodic CSI feedback parameter and a second aperiodic CSI feedback parameter in RRC signaling are both effective, sending aperiodic CSI on a first type subframe and a second type subframe to the base station; or when it is determined that the uplink scheduling signaling contains the feedback indication identifier and a third aperiodic CSI feedback parameter in the RRC signaling is effective, determining to perform aperiodic CSI feedback of the first type subframe or the second type subframe according to the subframe type indication identifier in the RRC signaling, and sending aperiodic CSI on the first type subframe or the second type subframe to the base station according to the third aperiodic CSI feedback parameter in the RRC signaling; or when it is determined that the uplink scheduling signaling contains the feedback indication identifier and a fourth aperiodic CSI feedback parameter in the RRC signaling is valid, sending aperiodic CSI on the first type subframe and the second type subframe to the base station according to the fourth aperiodic CSI feedback parameter.

Further, the sending unit 1402 includes:

the identification judgment subunit is used for judging whether the uplink scheduling signaling received on the first type subframe or the second type subframe contains a first feedback indication identification;

the information sending subunit is configured to send, to the base station, aperiodic CSI on a first-type subframe when it is determined that the uplink scheduling signaling received on the first-type subframe includes a first feedback indication identifier; or when the uplink scheduling signaling received on the second type subframe contains the first feedback indication identifier, sending the aperiodic CSI on the first type subframe and the second type subframe to the base station.

Further, the sending unit 1402 includes:

the identifier judging subunit is configured to judge whether the uplink scheduling signaling received on the first type subframe or the second type subframe includes a second feedback indication identifier;

the information sending subunit is configured to send, to the base station, aperiodic CSI on the first-type subframe when it is determined that the uplink scheduling signaling received on the first-type subframe includes the second feedback indication identifier; or when the uplink scheduling signaling received on the second type subframe is determined to contain the second feedback indication identifier, the aperiodic CSI feedback of the second type subframe or the first type subframe and the second type subframe is determined according to the subframe type indication information in the received RRC signaling, and the second type subframe or the aperiodic CSI on the first type subframe and the second type subframe is sent to the base station.

Further, the sending unit 1402 includes:

a carrier subframe obtaining subunit, configured to obtain a specified subframe type on a main carrier when aperiodic CSI feedback is determined according to the main carrier and the specified subframe type on the main carrier according to feedback indication information in the uplink scheduling signaling; when aperiodic CSI feedback is determined to be carried out according to a carrier wave in a first RRC signaling or a second RRC signaling and a subframe type on the carrier wave according to feedback indication information in an uplink scheduling signaling, acquiring the carrier wave and the subframe type on the carrier wave from the first RRC signaling or the second RRC signaling;

and the information sending subunit is used for sending the aperiodic CSI of the subframe type on the carrier determined by the carrier subframe acquisition subunit to the base station.

Further, the sending unit 1402 includes:

a determining subunit, configured to determine, when only one downlink carrier exists between the base station and the user equipment, a subframe type for aperiodic CSI feedback according to a subframe type identifier in the received uplink scheduling signaling;

a transmitting subunit, configured to transmit, to the base station, aperiodic CSI of a subframe of the subframe type.

Further, the sending unit 1402 includes:

the priority determining subunit is used for determining the priority of CSI contents on the first type subframe and the second type subframe or the priority of the first type subframe and the second type subframe when the CSI on the first type subframe and the second type subframe needs to be sent at the same time and the CSI on one subframe type can only be sent;

a sending subunit, configured to send, to the base station, CSI on a subframe with a higher priority of CSI content or a subframe with a higher priority of subframe type when priorities of CSI content on a first type subframe and a second type subframe are different or priorities of the first type subframe and the second type subframe are different; and when the priority of the CSI content on the first type subframe and the priority of the CSI content on the second type subframe are the same, sending the CSI on the subframe with the specified type to the base station, or sending the CSI on the first type subframe or the second type subframe to the base station in turn.

Further, the sending unit 1402 includes:

a position obtaining subunit, configured to obtain feedback position information of the first type subframe and/or the second type subframe from an RRC signaling or an uplink scheduling signaling sent by the base station, or obtain a feedback position of the first type subframe and/or the second type subframe according to a specified subframe measurement amount, or obtain feedback position information of the first type subframe and/or the second type subframe that is preset;

and the sending subunit is configured to send, to the base station, aperiodic CSI on the first-type subframe and/or the second-type subframe according to the feedback position information obtained by the position obtaining subunit.

According to the user equipment provided by the embodiment of the invention, the CSI feedback indication information is obtained from the base station through the uplink scheduling signaling and/or the RRC signaling, and the CSI on the first type subframe and/or the second type subframe is sent to the base station according to the CSI feedback indication information. Therefore, the base station can know the channel conditions between the base station and the user equipment on the first type subframe and the second type subframe, and reasonable scheduling of data is achieved.

Corresponding to the above method and apparatus, an embodiment of the present invention further provides a feedback system of channel state information, as shown in fig. 14, including:

a base station 1401, configured to send CSI feedback indication information to a user equipment 1402 through uplink scheduling signaling and/or RRC signaling; receiving CSI on a first type subframe and/or a second type subframe sent by the user equipment 1402 according to the CSI feedback indication information;

the user equipment 1402, configured to obtain CSI feedback indication information from the base station 1401 through uplink scheduling signaling and/or RRC signaling; and sending the CSI on the first type subframe and/or the second type subframe to the base station 1401 according to the CSI feedback indication information.

In the feedback system of channel state information provided in the embodiments of the present invention, a base station sends channel feedback indication information to a user equipment through an uplink scheduling signaling and/or an RRC signaling, and the user equipment sends CSI on a first type subframe and/or a second type subframe to the base station according to the channel feedback indication information. Therefore, the base station can know the channel conditions between the base station and the user equipment on the first type subframe and the second type subframe, and reasonable scheduling of data is achieved.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by signaling related hardware through a computer program, where the program can be stored in a computer-readable storage medium, and when executed, the program can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for feeding back channel state information, comprising:

sending Channel State Information (CSI) feedback indication information to user equipment through an uplink scheduling signaling and/or a Radio Resource Control (RRC) signaling;

2. The method of claim 1, wherein the sending the CSI feedback indication information to the UE through RRC signaling comprises:

sending an RRC signaling containing a first periodic CSI feedback parameter and a second periodic CSI feedback parameter to user equipment, wherein the first periodic CSI feedback parameter is used for indicating periodic CSI feedback and a feedback mode of a first type subframe or not, and the second periodic CSI feedback parameter is used for indicating periodic CSI feedback and a feedback mode of a second type subframe or not; or,

3. The method of claim 1, wherein the sending CSI feedback indication information to the ue through uplink scheduling signaling and RRC signaling comprises:

sending an uplink scheduling signaling containing a feedback indication identifier to user equipment, and sending an RRC signaling containing a first aperiodic CSI feedback parameter and a second aperiodic CSI feedback parameter to the user equipment, wherein the feedback indication identifier is used for indicating to perform CSI feedback, the first aperiodic CSI feedback parameter is used for indicating to perform aperiodic CSI feedback and a feedback mode of a first type subframe, or not to perform aperiodic CSI feedback of the first type subframe, and the second aperiodic CSI feedback parameter is used for performing aperiodic CSI feedback and a feedback mode of a second type subframe, or not to perform aperiodic CSI feedback of the second type subframe; or,

sending an uplink scheduling signaling containing a feedback indication identifier to user equipment, and sending an RRC signaling containing a third aperiodic CSI feedback parameter and a subframe type indication identifier to the user equipment, wherein the feedback indication identifier is used for indicating to perform CSI feedback, the subframe type indication identifier is used for indicating a subframe type for performing aperiodic CSI feedback, and the third aperiodic CSI feedback parameter is used for indicating a feedback mode or not performing aperiodic CSI feedback; or,

and sending an uplink scheduling signaling containing a feedback indication identifier to the user equipment, and sending an RRC signaling containing a fourth aperiodic CSI feedback parameter to the user equipment, wherein the feedback indication identifier is used for indicating to perform CSI feedback, and the fourth aperiodic CSI feedback parameter is used for indicating to perform periodic CSI feedback of the first type subframe and the second type subframe and a feedback mode thereof.

4. The method of claim 1, wherein the sending CSI feedback indication information to the ue through uplink scheduling signaling comprises:

sending an uplink scheduling signaling containing a first feedback indication identifier to user equipment on a first type subframe, wherein the uplink scheduling signaling containing the first feedback indication identifier is used for indicating aperiodic CSI feedback of the first type subframe; or,

and sending an uplink scheduling signaling containing a first feedback indication identifier to the user equipment on the second type subframe, wherein the uplink scheduling signaling containing the first feedback indication identifier is used for indicating the aperiodic CSI feedback of the first type subframe and the second type subframe.

5. The method of claim 1, wherein the sending CSI feedback indication information to the ue through uplink scheduling signaling and RRC signaling comprises:

sending an uplink scheduling signaling containing a second feedback indication identifier to user equipment on the first type subframe, wherein the uplink scheduling signaling containing the second feedback indication identifier is used for indicating aperiodic CSI feedback of the first type subframe;

sending an uplink scheduling signaling containing a second feedback indication identifier to user equipment on a second type subframe, and sending an RRC signaling containing subframe type indication information to the user equipment; the uplink scheduling signaling containing the second feedback indication mark and the subframe type indication information are used for indicating the aperiodic CSI feedback of the second type subframe or the aperiodic CSI feedback of the first type subframe and the second type subframe.

6. The method of claim 1, wherein the sending CSI feedback indication information to the ue through uplink scheduling signaling and RRC signaling comprises:

and sending an uplink scheduling signaling containing feedback indication information, and a first RRC signaling and a second RRC signaling containing a carrier and a subframe type on the carrier to the user equipment, wherein the feedback indication information is used for indicating the user equipment to perform aperiodic CSI feedback according to the main carrier and the subframe type on the main carrier, the carrier in the first RRC signaling and the subframe type on the carrier, or the carrier in the second RRC signaling and the subframe type on the carrier.

7. The method of claim 1, wherein the sending CSI feedback indication information to the ue through uplink scheduling signaling comprises:

when only one downlink carrier exists between a base station and user equipment, an uplink scheduling signaling containing a subframe type identifier is sent to the user equipment, wherein the subframe type identifier is used for indicating the subframe type for aperiodic CSI feedback.

8. The method of claim 1, further comprising:

the feedback time difference D is the difference between the sending time of the aperiodic CSI corresponding to the subframe type without periodic CSI feedback and the receiving time of the uplink scheduling signaling, and the feedback time difference T is the difference between the sending time of the aperiodic CSI corresponding to the subframe type with periodic CSI feedback and the receiving time of the uplink scheduling signaling;

and sending feedback position information of the first type subframe and/or the second type subframe to user equipment, wherein the feedback position information comprises the feedback time difference D.

9. A method for feeding back channel state information, comprising:

10. The method of claim 9, wherein the sending the CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information comprises:

sending periodic CSI on a first type subframe to the base station when only a first periodic CSI feedback parameter in RRC signaling is determined to be effective, sending periodic CSI on a second type subframe to the base station when only a second periodic CSI feedback parameter in the RRC signaling is determined to be effective, and sending periodic CSI on the first type subframe and the second type subframe to the base station when the first periodic CSI feedback parameter and the second periodic CSI feedback parameter in the RRC signaling are determined to be effective; or,

11. The method of claim 9, wherein the sending the CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information comprises:

when the uplink scheduling signaling is determined to contain a feedback indication identifier and only a first aperiodic CSI feedback parameter in RRC signaling is effective, sending aperiodic CSI on a first type subframe to the base station; when the uplink scheduling signaling is determined to contain the feedback indication identifier and only a second aperiodic CSI feedback parameter in the RRC signaling is effective, sending aperiodic CSI on a second type subframe to the base station; when it is determined that the uplink scheduling signaling contains a feedback indication identifier and a first aperiodic CSI feedback parameter and a second aperiodic CSI feedback parameter in RRC signaling are both effective, sending aperiodic CSI on a first type subframe and a second type subframe to the base station; or,

when it is determined that the uplink scheduling signaling contains a feedback indication identifier and a third aperiodic CSI feedback parameter in the RRC signaling is effective, determining to perform aperiodic CSI feedback of a first type subframe or a second type subframe according to the subframe type indication identifier in the RRC signaling, and sending aperiodic CSI on the first type subframe or the second type subframe to the base station according to the third aperiodic CSI feedback parameter in the RRC signaling; or,

and when it is determined that the uplink scheduling signaling contains the feedback indication identifier and a fourth aperiodic CSI feedback parameter in the RRC signaling is valid, sending aperiodic CSI on the first type subframe and the second type subframe to the base station according to the fourth aperiodic CSI feedback parameter.

12. The method of claim 9, wherein the sending the CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information comprises:

when the uplink scheduling signaling received on the first type subframe is determined to contain a first feedback indication identifier, sending aperiodic CSI on the first type subframe to the base station; or,

and when the uplink scheduling signaling received on the second type subframe is determined to contain the first feedback indication identifier, sending the aperiodic CSI on the first type subframe and the second type subframe to the base station.

13. The method of claim 9, wherein the sending the CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information comprises:

when the uplink scheduling signaling received on the first type subframe is determined to contain a second feedback indication identifier, sending aperiodic CSI on the first type subframe to the base station;

and when the uplink scheduling signaling received on the second type subframe contains a second feedback indication identifier, determining to perform aperiodic CSI feedback on the second type subframe or the first type subframe and the second type subframe according to subframe type indication information in the received RRC signaling, and sending the second type subframe or the aperiodic CSI on the first type subframe and the second type subframe to the base station.

14. The method of claim 9, wherein the sending the CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information comprises:

when aperiodic CSI feedback is determined to be carried out according to a main carrier and a subframe type on a specified main carrier according to feedback indication information in an uplink scheduling signaling, acquiring the specified subframe type on the main carrier, and sending aperiodic CSI on a subframe of the subframe type on the main carrier to a base station; or,

when aperiodic CSI feedback is determined to be performed according to a carrier in a first RRC signaling or a second RRC signaling and a subframe type on the carrier according to feedback indication information in an uplink scheduling signaling, acquiring the carrier and the subframe type on the carrier from the first RRC signaling or the second RRC signaling, and sending aperiodic CSI of a subframe of the subframe type on the carrier to a base station.

15. The method of claim 9, wherein the sending the CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information comprises:

when only one downlink carrier exists between a base station and user equipment, determining a subframe type for aperiodic CSI feedback according to a subframe type identifier in a received uplink scheduling signaling, and sending the aperiodic CSI of a subframe of the subframe type to the base station.

16. The method of claim 9, wherein the sending the CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information comprises:

when CSI on a first type subframe and a second type subframe needs to be sent at the same time and the CSI on one subframe type can only be sent, determining the priority of CSI contents on the first type subframe and the second type subframe or the priority of the first type subframe and the second type subframe;

when the priority of CSI content on the first type subframe is different from that of the second type subframe or the priority of the first type subframe is different from that of the second type subframe, sending CSI on a subframe with high priority of the CSI content or a subframe with high priority of the subframe type to the base station;

and when the priority of the CSI content on the first type subframe and the priority of the CSI content on the second type subframe are the same, sending the CSI on the subframe with the specified type to the base station, or sending the CSI on the first type subframe or the second type subframe to the base station in turn.

17. The method of claim 9, wherein the sending the CSI on the first type subframe and/or the second type subframe to the base station according to the CSI feedback indication information comprises:

the feedback time difference D is the difference between the sending time of the aperiodic CSI corresponding to the subframe type without the periodic CSI feedback and the receiving time of the uplink scheduling signaling, and the feedback time difference T is the difference between the sending time of the aperiodic CSI corresponding to the subframe type with the periodic CSI feedback and the receiving time of the uplink scheduling signaling;

acquiring feedback position information of a first type subframe and/or a second type subframe from RRC signaling or uplink scheduling signaling sent by a base station, or acquiring the feedback position of the first type subframe and/or the second type subframe according to a specified subframe measurement number, or acquiring preset feedback position information of the first type subframe and/or the second type subframe;

and sending the aperiodic CSI on the first type subframe and/or the second type subframe to the base station according to the feedback position information.

18. A base station, comprising:

19. The base station of claim 18, wherein the sending unit is specifically configured to send, to the ue, an RRC signaling that includes a first periodic CSI feedback parameter and a second periodic CSI feedback parameter, where the first periodic CSI feedback parameter is used to indicate performing periodic CSI feedback and a feedback manner of a first type subframe, or not performing periodic CSI feedback of the first type subframe, and the second periodic CSI feedback parameter is used to indicate performing periodic CSI feedback and a feedback manner of a second type subframe, or not performing periodic CSI feedback of the second type subframe; or,

20. The base station of claim 18, wherein the transmitting unit comprises:

a scheduling signaling sending subunit, configured to send an uplink scheduling signaling including a feedback indication identifier to a user equipment, where the feedback indication identifier is used to indicate CSI feedback;

21. The base station of claim 18, wherein the sending unit is specifically configured to send an uplink scheduling signaling including a first feedback indication identifier to the ue on the first-type subframe to indicate aperiodic CSI feedback of the first-type subframe; or, sending an uplink scheduling signaling containing the first feedback indication identifier to the user equipment on the second type subframe to indicate that aperiodic CSI feedback of the first type subframe and the second type subframe is performed.

22. The base station of claim 18, wherein the transmitting unit comprises:

23. The base station of claim 18, wherein the transmitting unit comprises:

and the high-layer signaling sending subunit is used for sending a first RRC signaling and a second RRC signaling which comprise carriers and subframe types on the carriers to the user equipment.

24. The base station according to claim 18, wherein the sending unit is specifically configured to send, to the ue, an uplink scheduling signaling including a subframe type identifier when only one downlink carrier exists between the base station and the ue, where the subframe type identifier is used to indicate a subframe type for aperiodic CSI feedback.

25. The base station of claim 18, wherein a feedback time difference D > a feedback time difference T, the feedback time difference D is a difference between a transmission time of aperiodic CSI corresponding to a subframe type without periodic CSI feedback and a reception time of the uplink scheduling signaling, and the feedback time difference T is a difference between a transmission time of aperiodic CSI corresponding to a subframe type with periodic CSI feedback and a reception time of the uplink scheduling signaling;

the sending unit is further configured to send feedback position information of the first type subframe and/or the second type subframe to the user equipment, where the feedback position information includes the feedback time difference D.

26. A user device, comprising:

27. The UE of claim 26, wherein the sending unit is specifically configured to send the periodic CSI on the first-type subframe to the base station when it is determined that only the first periodic CSI feedback parameter in the RRC signaling is valid, send the periodic CSI on the second-type subframe to the base station when it is determined that only the second periodic CSI feedback parameter in the RRC signaling is valid, and send the periodic CSI on the first-type subframe and the second-type subframe to the base station when it is determined that the first periodic CSI feedback parameter and the second periodic CSI feedback parameter in the RRC signaling are valid; or,

28. The UE of claim 26, wherein the sending unit comprises:

29. The UE of claim 26, wherein the sending unit comprises:

30. The UE of claim 26, wherein the sending unit comprises:

the information sending subunit is configured to send, to the base station, aperiodic CSI on the first-type subframe when it is determined that the uplink scheduling signaling received on the first-type subframe includes the second feedback indication identifier; and when the uplink scheduling signaling received on the second type subframe contains a second feedback indication identifier, determining to perform aperiodic CSI feedback on the second type subframe or the first type subframe and the second type subframe according to subframe type indication information in the received RRC signaling, and sending the second type subframe or the aperiodic CSI on the first type subframe and the second type subframe to the base station.

31. The UE of claim 26, wherein the sending unit comprises:

32. The UE of claim 26, wherein the sending unit comprises:

33. The UE of claim 26, wherein the sending unit comprises:

34. The UE of claim 26, wherein the sending unit comprises:

35. A system for feeding back channel state information, comprising: