KR20120016013A - Method of requesting aperiodic channel state information report and transmitting the same in a carrier aggregation environment - Google Patents

Abstract

PURPOSE: An aperiodic channel state information requesting and reporting method in a carrier aggregation environment is provided to minimize the waste of wireless resources. CONSTITUTION: A base station determines whether the data to be received through a PUSCH(Physical Uplink Shared Channel) is in UL(Up Link) CC(Component Carrier) m which is linked to DL(Down Link) CC k, and whether the data to be received through PUSCH is in UL CC expect the UL CC m(S110). The base station requests an aperiodic channel state information reporting through the UL CC m, or the UL CC except the UL CC m which has the data to be received through the PUSCH(S120).

Description

Method of requesting aperiodic channel state information report and transmitting the same in a carrier aggregation environment}

The present invention relates to channel state information (CSI) transmission in a carrier aggregation environment, and more particularly, a base station reports an aperiodic channel state information to a user equipment in a carrier aggregation environment. The present invention relates to a requesting method and a method in which a terminal reports aperiodic channel state information.

The 3GPP standardization organization named the candidate technology for the next generation mobile communication system, the IMT-Advanced system, as the 3GPP LTE-Advanced system, and standardization work on the 3GPP LTE-Advanced system and later is in progress.

In the 3GPP LTE-Advanced system, the carrier aggregation technology that can increase the transmission performance and resource utilization by extending the bandwidth used in communication is decided. This technology is called downlink (DL). And a technique for transmitting data using a plurality of component carriers (CC) in uplink (UL).

3GPP TS 36.211 V 9.0.0, which is the conventional 3GPP LTE release 8/9 standard, when there is no carrier aggregation technology, the base station requests the terminal to report channel state information (CSI) aperiodically (aperiodic) and A method for a terminal to report CSI information aperiodically is described.

In the conventional 3GPP LTE release 8/9 standard, in which only one downlink carrier and one uplink carrier existed, aperiodic channel state information is provided through uplink grant information of a downlink carrier control channel (PDCCH). Is scheduled to the terminal, the terminal transmits the data and channel state information together if there is data to be transmitted through the PUSCH channel on the uplink, and the channel state if there is no data to be transmitted through the PUSCH channel Configured to transmit only information on the PUSCH channel.

 However, in a carrier aggregation environment in which downlink and uplink may each consist of a plurality of component carriers, a method of requesting a base station to report aperiodic channel state information to a terminal (eg, an aperiodic channel for a downlink component carrier) How to request status information reporting request to a downlink component carrier and a method for reporting aperiodic channel status information to a base station reporting aperiodic channel status information to a base station (for example, which downlink component carriers) It is not defined in which way to transmit aperiodic channel state information for which uplink component carrier.

It is a first object of the present invention to provide a method for requesting aperiodic channel state information reporting to a terminal of a base station in a carrier aggregation environment.

In addition, a second object of the present invention is a method for reporting aperiodic channel state information for a base station of a terminal in a carrier aggregation environment, when a base station requests for reporting aperiodic channel state information for one downlink component carrier. A method of reporting aperiodic channel state information for a downlink component carrier is provided.

In addition, a third object of the present invention is a method for reporting aperiodic channel state information for a base station of a terminal in a carrier aggregation environment, when the base station requests aperiodic channel state information for a plurality of downlink component carriers. A method of reporting aperiodic channel state information for a downlink component carrier is provided.

The method according to the present invention for achieving the first object of the present invention is a method for requesting reporting of aperiodic channel state information for a terminal of a base station in a carrier aggregation environment, the aperiodic channel state for a k-th downlink component carrier When requesting information reporting, the mth uplink component carrier linked to the kth downlink component carrier has data to be received from the terminal through an uplink physical shared channel (PUSCH) and excludes the mth uplink component carrier. Determining whether there is data to be received from the terminal through the PUSCH in the uplink component carrier; and there is no data to be received from the terminal through the PUSCH in the mth uplink component carrier and uplink except the mth uplink component carrier On the component carrier via PUSCH When there is data to be received from the terminal, the aperiodic channel using the uplink component carrier except the m-th uplink component carrier, or the m-th uplink component carrier that has data to be received from the terminal through a PUSCH A method for requesting reporting of aperiodic channel state information, including requesting to report state information, is provided.

Here, the requesting to report the aperiodic channel state information indicates an nth (n ≠ m) uplink component carrier to receive the aperiodic channel state information report on the PDCCH of the kth downlink component carrier. And a carrier indicator field (CIF).

Here, the requesting of reporting the aperiodic channel state information includes scheduling information of the PUSCH of the mth uplink component carrier to receive the aperiodic channel state information report on the PDCCH of the kth downlink component carrier. Can be configured to transmit.

The method according to the present invention for achieving the second object of the present invention is a method for reporting aperiodic channel state information for a base station of a terminal in a carrier aggregation environment, the method comprising: (a) a control channel of a k-th downlink component carrier ( Receiving a request for reporting aperiodic channel state information for a k-th downlink component carrier from a PDCCH; and (b) if a carrier indicator (CIF) is included in the request for reporting aperiodic channel state information, the CIF specifies Transmitting aperiodic channel state information through a PUSCH of an uplink component carrier; and (c) when the aperiodic channel state information report request does not include PUSCH scheduling information, m linked to the k-th downlink component carrier. Aperiodic using PUSCH of nth (n ≠ m) uplink component carrier excluding the first uplink component carrier Channel provides aperiodic channel state information reporting method including the step of transmitting status information.

Here, in step (c), the nth (n ≠ m) uplink component carriers among the component carriers except the mth uplink component carriers linked to the kth downlink component carrier are prioritized according to a predetermined rule. The high component carrier can be configured to be selected.

The method according to the present invention for achieving the third object of the present invention is a method for reporting aperiodic channel state information for a base station of a terminal in a carrier aggregation environment, comprising: (a) a control channel of at least one downlink component carrier; Receiving aperiodic channel state information report request for at least one downlink component carrier from (PDCCH), (b) Uplink linked to the at least one downlink component carrier for which the aperiodic channel state information report is requested It is determined whether at least one of the uplink component carriers excluding the link component carrier has data to be transmitted in the PUSCH, and whether there is no data to be transmitted in the PUSCH in the uplink component carriers linked to the at least one downlink component carrier. And (c) based on the determination of step (b). Aperiodic channel state information reporting method comprising the step of transmitting aperiodic channel state information to the base station.

Here, in step (b), data to be transmitted to the PUSCH exists in at least one of the uplink component carriers other than the uplink component carrier linked to the at least one downlink component carrier for which the aperiodic channel state information report is requested. If it is determined that there is no data to be transmitted in the PUSCH in the uplink component carriers linked to the at least one downlink component carrier, the uplink component carrier in which data to be transmitted to the PUSCH exists in step (c) The component carrier may be configured to transmit the aperiodic channel state information report to the base station by selecting a component carrier having a high priority according to a predetermined rule.

Here, in step (b), at least one of the uplink component carriers except for the uplink component carrier linked to the at least one downlink component carrier for which the aperiodic channel state information report is requested is present to transmit to the PUSCH. If it is determined that there is no data to be transmitted in a PUSCH in uplink component carriers linked to the at least one downlink component carrier, the at least one requesting the aperiodic channel state information report is requested in step (c). One of the uplink component carriers linked to one downlink component carrier may be configured to transmit channel state information through the PUSCH.

Here, the at least one downlink component in which the aperiodic channel state information report request includes a carrier indicator (CIF) in step (a) and the aperiodic channel state information report is requested in step (b). At least one of uplink component carriers other than the uplink component carrier linked to the carrier has data to be transmitted to the PUSCH, and uplink component carriers linked to the at least one downlink component carrier have no data to be transmitted to the PUSCH. If it is determined not to be, in step (c) it may be configured to transmit the channel state information using the uplink component carrier designated by the carrier indicator (CIF).

Here, an uplink component carrier except the uplink component carrier linked to the at least one downlink component carrier for which the aperiodic channel state information report is requested in step (b), and the at least one downlink component carrier If it is determined that there is no data to be transmitted in the PUSCH in uplink component carriers linked to the uplink component carriers, the uplink linked to the at least one downlink component carrier for which the aperiodic channel state information report is requested in step (c) is requested. One of the link component carriers may be configured to transmit the channel state information on the PUSCH.

Here, the at least one downlink component in which the aperiodic channel state information report request includes a carrier indicator (CIF) in step (a) and the aperiodic channel state information report is requested in step (b). If it is determined that there is no data to be transmitted in the PUSCH in the uplink component carriers other than the uplink component carriers linked to the carrier and the uplink component carriers linked to the at least one downlink component carrier, (c) In step, the carrier indicator (CIF) may be configured to transmit the channel state information using the uplink component carrier designated.

When the aperiodic channel state information request method and the channel state information transmission method according to the present invention as described above are used, the aperiodic channel state information can be easily performed even in a carrier aggregation environment in which a plurality of uplink component carriers and downlink component carriers exist. The base station requests and the terminal can transmit.

In particular, by optimizing the resources used to transmit the aperiodic channel state information, it is possible to take advantage of carrier aggregation to minimize the waste of radio resources.

1 is a flowchart illustrating a method for requesting aperiodic channel state information reporting for a terminal of a base station according to the present invention.
2 is a flowchart illustrating an example of a method for reporting aperiodic channel state information for a base station of a terminal according to the present invention.
3 is a conceptual diagram illustrating an example of a method of selecting an uplink component carrier to transmit channel state information in the aperiodic channel state information reporting method for a base station of a terminal according to the present invention.
4 is a conceptual diagram illustrating another example of a method of selecting an uplink component carrier to transmit channel state information in the aperiodic channel state information reporting method for a base station of a terminal according to the present invention.
5 is a flowchart illustrating another example of a method for reporting aperiodic channel state information for a base station of a terminal according to the present invention.

As the present invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description.

However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

As used herein, the term 'terminal' includes a mobile station (MS), a user equipment (UE), a user terminal (UT), a wireless terminal, an access terminal (AT), a terminal, a subscriber unit, A subscriber station (SS), wireless device, wireless communication device, wireless transmit / receive unit (WTRU), mobile node, mobile or other terms may be referred to. Various embodiments of the terminal may be used in various applications such as cellular telephones, smart phones with wireless communication capabilities, personal digital assistants (PDAs) with wireless communication capabilities, wireless modems, portable computers with wireless communication capabilities, Devices, gaming devices with wireless communication capabilities, music storage and playback appliances with wireless communication capabilities, Internet appliances capable of wireless Internet access and browsing, as well as portable units or terminals incorporating combinations of such functions However, the present invention is not limited thereto.

As used herein, the term 'base station' generally refers to a fixed or mobile point of communication with a terminal, and includes a base station, a Node-B, an eNode-B, and a BTS. The term “base transceiver system”, “access point”, relay, and femto-cell may be used collectively.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. In describing the present invention, in order to facilitate the overall understanding, the same reference numerals are used for the same elements in the drawings, and redundant description of the same elements is omitted.

In the present invention, when there is a carrier aggregation technology, a method for requesting a base station to report channel state information (CSI) to an aperiodic (aperiodic) when a base station exists and a terminal to aperiodically report channel state information to a base station. Suggest ways to report.

In addition, in the present invention, when the control information is transmitted in an uplink physical uplink shared channel (PUSCH) in an environment in which carrier aggregation technology exists, information on which PUSCH the terminal transmits control information to is determined by a base station. Suggest ways to inform your child. Here, the control information refers to information including at least one of channel state information, precoding matrix information (PMI), ACK / NACK information, and RI information.

Meanwhile, in the following description, an uplink component carrier Linkage UL CC associated with a kth downlink component carrier (hereinafter, referred to as DL CC k) is referred to as an mth uplink component carrier (hereinafter, referred to as UL CC m). Assume Here, one of the methods for establishing a linkage between the downlink component carrier and the uplink component carrier may be a method in which the base station informs the terminal through higher layer signaling. In addition, k and m may each have a value of 1 to 5 in the 3GPP release 10 standard (up to 5 uplink / downlink component carriers may be used), but may be changed in the next standard.

Method for requesting reporting of aperiodic channel state information to a terminal of a base station

1 is a flowchart illustrating a method for requesting aperiodic channel state information reporting for a terminal of a base station according to the present invention.

Referring to FIG. 1, the method for requesting reporting of aperiodic channel state information for a terminal of a base station according to the present invention is a method for requesting reporting of aperiodic channel state information for a terminal of a base station in a carrier aggregation environment. When requesting periodic channel state information report, the UL CC m linked to DL CC k has data to be received from the terminal through the uplink physical shared channel (PUSCH) and the PUSCH to the uplink component carrier except UL CC m. Determining whether there is data to be received from the terminal through (S110) and there is no data to be received from the terminal through the PUSCH in UL CC m, and from the terminal through the PUSCH in the uplink component carrier excluding UL CC m If there is data to be received, the UL CC m, or the UL C with data to be received from the terminal through a PUSCH And requesting to report the aperiodic channel state information using an uplink component carrier excluding C m (S120).

First, in step S110, when the base station needs to receive aperiodic report of channel state information on a specific downlink component carrier (eg, DL CC k), determining an uplink component carrier to receive the corresponding information. Steps to be performed. That is, in the method for requesting aperiodic channel state information reporting to a terminal of a base station according to the present invention, data to be transmitted through a PUSCH exists in one or a plurality of uplink component carriers other than the UL CC m linked to the DL CC k. The main target is a case where there is no data to be transmitted in the UL CC m.

However, even if there is no data to be transmitted through the PUSCH in the UL CC m, it may be configured to request the terminal to transmit only the channel state information to the PUSCH without data through the UL CC m, without the other uplink component carriers. .

Next, when it is determined in step S110 that there is no data to be transmitted through the PUSCH in the UL CC m, and it is determined that the data to be transmitted in the PUSCH in the uplink component carrier except the UL CC m, the base station is The terminal requests the terminal to report the aperiodic channel state information by using an uplink component carrier other than the UL CC m which has data to be received from the terminal through UL CC m or PUSCH (S120).

At this time, in step S120, the base station may transmit the aperiodic channel state information report request related information to the PDCCH associated with the DL CC k in order to request the terminal to report aperiodic channel state information for the DL CC k.

In this case, when a carrier indication field (CIF) is present in the PDCCH, a PDCCH requesting aperiodic reporting of channel state information for the DL CC k may exist in another DL CC other than the DL CC k. However, if there is no CIF in the PDCCH, the CSI report request related information should be transmitted in the PDCCH of the DL CC k.

In step S120, the base station may request the terminal to report the channel state information aperiodically using the PDCCH. That is, the method for transmitting the aperiodic channel state information report request to the UE may be described as a method for configuring a PDCCH corresponding to an uplink grant.

(Method 1) In case that data to be transmitted in a PUSCH exists in UL CC n (where n ≠ m, that is, an uplink component carrier having data to be transmitted in a PUSCH as an uplink component carrier other than UL CC m), DL In CC k, the PDCCH indicating the uplink grant may be transmitted without including specific scheduling information (for example, resource location information for uplink transmission). By doing so, when specific scheduling information does not exist when the UE detects the corresponding PDCCH, even if the CSI cannot be reported by the PUSCH of another UL CC, the CSI cannot be reported through the PUSCH by the UL CC m. (I.e., to prevent reporting through UL CC m using a PUSCH including only CSI without data).

(Method 2) Uplink CC information for reporting CSI to PDCCH requesting to report CSI for DL CC k aperiodically when data to be transmitted in PUSCH exists in UL CC n (where n ≠ m) (Eg, channel state information carrier indication field (CSI-CIF). In this case, when the PDCCH information is information for requesting aperiodic reporting of the CSI, the terminal feeds back the CSI using an uplink CC corresponding to the CSI-CIF value present in the PDCCH. In this case, the PDCCH may be configured not to increase the size of the PDCCH by adding CSI-CIF information instead of sending a field not related to the aperiodic reporting of the CSI in the PDCCH corresponding to the uplink grant. One way to do this is to remove the scheduling information (eg, resource location information to be used for uplink transmission) field or the New Data Indicator (NDI) and transmit CSI-CIF information. The terminal interprets the bits in the PDCCH differently depending on whether the PDCCH information indicating the UL grant is information for requesting CSI reporting. That is, when the PDCCH requests CSI reporting, some of the information in the PSICH is interpreted as CSI-CIF, and when not requesting CSI reporting, it is not interpreted as CSI-CIF.

(Method 3) In case that data to be transmitted by PUSCH exists in UL CC n (where n ≠ m), specific scheduling information (for example, resource location information to be used for uplink transmission) in a PDCCH indicating uplink grant To transmit. By doing so, the UE can report CSI information on the PUSCH aperiodically as a UL CC m using specific scheduling information for the UL CC m present in the corresponding PDCCH. Although there is no data to be transmitted through the PUSCH in the UL CC m, the method is configured to request the terminal to transmit only the channel state information to the PUSCH without data through the UL CC m and without data through the UL CC m. Yes.

(Method 4) If there is a PUSCH for data transmission in UL CC n (where n ≠ m), specific scheduling information (for example, resource location information to be used for uplink transmission) in a PDCCH indicating uplink permission ) And CSI-CIF information. By doing so, the UE reports the CSI using the UL CC corresponding to the CSI-CIF (Method 2) or PUSCH aperiodically with the UL CC m using specific scheduling information for the UL CC m present in the PDCCH. Is to enable reporting of CSI information (Method 3). That is, Method 4 is a combination of Method 2 and Method 3, which is configured to selectively operate in a terminal.

How to report aperiodic channel status information-1 downlink CC  object

First, a method of reporting aperiodic channel state information of a terminal according to the present invention when a terminal is requested to report aperiodic channel state information for one downlink component carrier will be described.

Descriptions of abbreviations (DL CC k, UL CC m, UL CC n, etc.) in the following description are the same as described above, and thus repetitive description is omitted.

2 is a flowchart illustrating an example of a method for reporting aperiodic channel state information for a base station of a terminal according to the present invention.

Referring to FIG. 2, an example of a method for reporting aperiodic channel state information for a terminal according to the present invention is a method for reporting aperiodic channel state information for a base station of a terminal in a carrier aggregation environment. Receiving an aperiodic channel state information report request for DL CC k from a control channel (PDCCH) (S210); (b) if the CIF is included in the aperiodic channel state information report request, transmitting aperiodic channel state information through a PUSCH of an uplink component carrier designated by the CIF (S220) and (c) the aperiodic If the PUSCH scheduling information is not included in the channel state information report request, transmitting aperiodic channel state information using a PUSCH of UL CC n (n ≠ m) except for the UL CC m linked to the DL CC k ( It may be configured to include (S230).

First, the aperiodic channel state information reporting method described above may be applied when data to be transmitted through PUSCH exists in one or a plurality of uplink component carriers other than UL CC m and data to be transmitted does not exist in UL CC m. have. If there is data to be transmitted through the PUSCH in the UL CC m linked to the DL CC k, the data and the channel state information are generally transmitted through the PUSCH together through the UL CC m.

First, step S210 is a step of receiving an aperiodic channel state information report request for DL CC k from a control channel (PDCCH) of DL CC k, which is transmitted from the base station through step S120 described with reference to FIG. 1. Receiving the requested aperiodic channel state information report.

Next, step S220 is a step of reporting channel state information when the aperiodic channel state information request received in step S210 described above includes a CIF that designates an uplink component carrier to transmit channel state information. S230 corresponds to the channel state information reporting step when the CIF indicating the uplink component carrier to which the channel state information is to be transmitted is not included in the aperiodic channel state information request received in step S210 described above.

first. In the case of step S220, it is determined whether CSI-CIF exists in the PDCCH requesting aperiodic transmission of CSI (S221). If CIF (CSI-CIF) exists, it exists in the UL CC indicated by CSI-CIF. Transmission is performed using the PUSCH (S222). And, if the PUSCH does not exist in the UL CC corresponding to the CSI-CIF, or if the PDCCH for the PUSCH is not properly detected, one of the methods that the terminal can take is not to feed back the CSI, and another method is DL The CSI is fed back to the UL CC m associated with CC k, another method is to specify the priority for the UL CC to be used when it can not be transmitted to the UL CC corresponding to the CSI-CIF and the data according to the priority The CSI is transmitted by selecting the UL CC in which the PUSCH to be transmitted exists.

Next, in step S230, it is determined whether specific scheduling information for reporting channel state information is included in the channel state information report request from the base station (S231), and if the specific scheduling information is not included, the terminal is determined. To transmit the data and the CSI together in one of the PUSCHs allocated for data transmission (S232).

3 is a conceptual diagram illustrating an example of a method of selecting an uplink component carrier to transmit channel state information in the aperiodic channel state information reporting method for a base station of a terminal according to the present invention.

Referring to FIG. 3, in the method of selecting one of the PUSCHs, the UL CCs may be selected in the order of high priority according to a predetermined rule between the base station and the terminal, and the base station selects a specific UL CC through higher layer signaling. May be informed or the priority for UL CCs.

For example, FIG. 3 illustrates a case in which a DL CC 3 notifies a base station of a CSI report request for DL CC 3. In this case, if UL CC 1 and UL CC 2 have data to be transmitted in PUSCH, and UL CC 3 has no data to be transmitted in PUSCH, CSI is transmitted through UL CC 1 among UL CC 1 and UL CC 2 according to a predetermined rule. do. For example, in FIG. 3, a rule is defined as transmitting CSI through a UL CC having the lowest number.

Lastly, although not shown in FIG. 2 described above, the terminal may be configured to transmit only channel state information without data in a PUSCH of an uplink component carrier (UL CC m) associated with the DL CC k.

For example, FIG. 4 is a conceptual diagram for explaining such a method, and for explaining another example of a method for selecting an uplink component carrier to transmit channel state information in the aperiodic channel state information reporting method for a base station of a terminal according to the present invention. Conceptual diagram.

Referring to FIG. 4, as in FIG. 3, a case in which a DL CC 3 notifies a base station of a CSI report request for DL CC 3 is illustrated. That is, the UL CC 3 has no data to transmit to the PUSCH, the UL CC 1 and UL CC 2 has a data to be transmitted to the PUSCH, but configures the PUSCH with only the channel state information without data through the UL CC 3 rather than the UL CC 1 or UL CC 2 It illustrates the case of transmitting by.

On the other hand, when there is no data to be transmitted through the PUSCH in the uplink component carrier other than UL CC m and there is no data to be transmitted in the UL CC m, the following channel state information reporting method may be applied.

(Method 1) When specific scheduling information (eg, resource location information for uplink transmission) for uplink transmission exists in a downlink physical control channel indicating an uplink grant of DL CC k The terminal transmits aperiodic CSI information to the PUSCH of the linkage UL CC (UL CC m) using the scheduling information. That is, the terminal may be configured to transmit only channel state information without data through the PUSCH of the uplink component carrier UL CC m associated with the DL CC k.

(Method 2) When CSI-CIF information exists in a downlink physical control channel indicating an uplink grant of DL CC k, aperiodic CSI information is transmitted using a UL CC indicated by CSI-CIF. .

(Method 3) When specific scheduling information (for example, resource location information for uplink transmission) for uplink transmission does not exist in a downlink physical control channel indicating uplink grant of DL CC k, the terminal Does not transmit aperiodic CSI information to the base station.

Aperiodic Channel State Information Reporting Method-Multiple Downlinks CC  object

Next, a method of reporting aperiodic channel state information of a terminal according to the present invention when a terminal is requested to report aperiodic channel state information for a plurality of downlink component carriers will be described.

In the following description, a set of uplink component carriers associated with downlink component carriers requesting aperiodic reporting of CSI information is referred to as 'A'. For example, a base station requests a terminal to report aperiodic CSI information for DL CC 1 and DL CC 3, and UL component carriers associated with DL CC 1 and DL CC 3 are referred to as UL CC 1 and UL CC 2, respectively. In this case, the set A may be expressed as {1, 2}.

5 is a flowchart illustrating another example of a method for reporting aperiodic channel state information for a base station of a terminal according to the present invention.

Referring to FIG. 5, another example of a method for reporting aperiodic channel state information for a terminal according to the present invention is a method for reporting aperiodic channel state information for a base station of a terminal in a carrier aggregation environment, which includes (a) at least one downlink Receiving aperiodic channel state information report request for at least one downlink component carrier from a PDCCH of a link component carrier (S510), (b) The at least one downlink component for which the aperiodic channel state information report is requested At least one of uplink component carriers other than the uplink component carrier linked to the carrier has data to be transmitted in the PUSCH, and uplink component carriers linked to the at least one downlink component carrier have data to be transmitted in the PUSCH. Determining whether there is no (S520) and (c) step (b) ( And transmitting the aperiodic channel state information to the base station based on the determination of S520.

First, in step (a) (S510), it is configured to receive aperiodic channel state information report request for at least one downlink component carrier from a PDCCH of at least one downlink component carrier. For example, aperiodic channel state information reporting request may be received from a PDCCH associated with each downlink component carrier to be reported for aperiodic channel state information, and a plurality of downlink component carriers may be received from a PDCCH of one downlink component carrier. It may be configured to receive a non-periodic channel state information report request for at once. In this case, the aperiodic channel state information report request through the PDCCH may be configured to receive the aperiodic channel state information report request transmitted from the base station in the same manner as step S120 described with reference to FIG.

Next, in step (b) (S520), at least one of the uplink component carriers other than the uplink component carrier linked to the at least one downlink component carrier for which the aperiodic channel state information report is requested is transmitted to the PUSCH. It is determined whether data exists and whether there is no data to be transmitted in a PUSCH in uplink component carriers linked to the at least one downlink component carrier. In this case, according to the determination result of step (b), step (c) (S530) may be performed differently.

First, in step (b) (S530), a PUSCH for data transmission exists in at least one of the uplink component carriers not belonging to the set A, and there is no data to be transmitted in the uplink component carriers belonging to the set A. If it is determined that step (c) (S530) of transmitting the aperiodic channel state information to the base station may be performed as follows.

(Method 1) The terminal transmits data and CSI together to one of the PUSCHs allocated for data transmission. In this case, a method of selecting one of the PUSCHs may be selected based on a predetermined rule between the base station and the terminal, or the base station may inform the terminal through higher layer signaling.

(Method 2) The terminal transmits only channel state information without data to a PUSCH of one uplink component carrier belonging to set A.

(Method 3) When CSI-CIF information exists in at least one of PDCCHs requesting aperiodic reporting of CSI, CSI is transmitted using UL CC corresponding to CSI-CIF value.

Meanwhile, in step (b) (S520), it is determined that there is no PUSCH for data transmission among the uplink component carriers not belonging to the set A, and there is no data to be transmitted to the uplink component carriers belonging to the set A. In this case, step (c) (S530) of transmitting aperiodic channel state information to the base station may be configured as follows.

(Method 1) When there is specific scheduling information (eg, resource location information for uplink transmission) in uplink transmission in PDCCH of at least one of downlink component carriers requesting aperiodic CSI reporting In this case, the terminal transmits only aperiodic CSI information to the PUSCH of one of the uplink component carriers belonging to the set A using the specific scheduling information. In this case, a method of selecting one of the PUSCHs may be selected based on a predetermined rule between the base station and the terminal, or the base station may inform the terminal through higher layer signaling.

(Method 2) Specific scheduling information (eg, resource location information for uplink transmission) for uplink transmission does not exist in any of the downlink component carriers that have requested aperiodic CSI reporting on the PDCCH. In this case, the terminal does not report aperiodic CSI information to the base station.

(Method 3) When CSI-CIF information exists in at least one of PDCCHs requesting aperiodic reporting of CSI, CSI is transmitted using UL CC corresponding to CSI-CIF value.

PUSCH The facts notification method

Hereinafter, a method of informing that the control information is included in the PUSCH when the control information is transmitted through the PUSCH will be described.

In a carrier aggregation environment, when a terminal transmits control information to a PUSCH, a situation arises in which the base station needs to be informed that the control information is transmitted to the PUSCH. An example of such a case is a case where a PUSCH for transmitting control information from a terminal is different from a PUSCH expected by a base station.

That is, when there are a plurality of component carriers in the uplink, for example, the base station was expected to transmit control information in the PUSCH of the uplink component carrier 1 (UL CC 1), but the terminal is uplink component carrier 2 ( This is the case where control information is transmitted to UL CC 2). In this case, the base station has to perform blind decoding on which UL CC the control information is transmitted to, which is very complicated to perform.

Therefore, in the present invention, the following methods may be applied in order for the base station to easily find the UL CC on which the control information is transmitted.

(Method 1) When the control information is included in the PUSCH, the terminal performs a CRC calculation in another way to generate parity bits and transmits the parity bits. That is, the terminal calculates the CRC in different ways according to whether the control information is included in the PUSCH, and generates and transmits the parity bits.

In this case, the base station applies the CRC detection method used when the control information is not included, and if an error occurs, the base station determines whether to include the control information by applying the CRC detection method used when the control information is included. Can be.

(Method 2) If control information is included in the PUSCH, the terminal uses another scrambling code. That is, the terminal applies different scrambling codes depending on whether or not control information is included in the PUSCH.

In this case, the base station applies the scrambling code used when the control information is not included, and if an error occurs, the base station applies the scrambling code used when the control information is included to determine whether to include the control information. Can be.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

Claims (11)

A method for requesting reporting of aperiodic channel state information for a terminal of a base station in a carrier aggregation environment, the method comprising:
When requesting reporting of aperiodic channel state information for a kth downlink component carrier, data to be received from the terminal through an uplink physical shared channel (PUSCH) to an mth uplink component carrier linked to a kth downlink component carrier Determining whether there is data to be received from the terminal through a PUSCH in an uplink component carrier except for an mth uplink component carrier; And
When there is no data to be received from the terminal through the PUSCH in the m-th uplink component carrier, and there is data to be received from the terminal through the PUSCH in the uplink component carriers except the m-th uplink component carrier, the m-th uplink Aperiodic channel including requesting to report the aperiodic channel state information using a component carrier or an uplink component carrier other than the mth uplink component carrier having data to be received from the terminal through a PUSCH How to request status information reporting. The method of claim 1,
The requesting to report the aperiodic channel state information may include: a carrier indicator indicating an nth (n ≠ m) uplink component carrier to receive the aperiodic channel state information report on the PDCCH of the kth downlink component carrier; Method for requesting aperiodic channel state information reporting comprising a field indicator (CIF). The method of claim 1,
The requesting to report the aperiodic channel state information may include transmitting scheduling information of a PUSCH of an mth uplink component carrier to receive the aperiodic channel state information report on the PDCCH of the kth downlink component carrier. Aperiodic channel state information reporting request method, characterized in that. A method for reporting aperiodic channel state information for a base station of a terminal in a carrier aggregation environment,
(a) receiving a request for reporting aperiodic channel state information for a k-th downlink component carrier from a control channel (PDCCH) of a k-th downlink component carrier;
(b) transmitting aperiodic channel state information through a PUSCH of an uplink component carrier designated by the CIF when a carrier indicator (CIF) is included in the aperiodic channel state information report request; And
(c) an nth (n ≠ m) uplink component carrier excluding the mth uplink component carrier linked to the kth downlink component carrier when the aperiodic channel state information report request does not include PUSCH scheduling information. Aperiodic channel state information reporting method comprising the step of transmitting aperiodic channel state information using the PUSCH of the. The method of claim 4, wherein
In the step (c), the nth (n ≠ m) uplink component carriers among the component carriers other than the mth uplink component carriers linked to the kth downlink component carrier are high priority components according to a predetermined rule. And wherein the carrier is configured to be selected. A method for reporting aperiodic channel state information for a base station of a terminal in a carrier aggregation environment,
(a) receiving a request for reporting aperiodic channel state information for at least one downlink component carrier from a control channel (PDCCH) of at least one downlink component carrier;
(b) whether at least one of the uplink component carriers other than the uplink component carrier linked to the at least one downlink component carrier for which the aperiodic channel state information report is requested exists and there is data to be transmitted to the PUSCH, and the at least Determining whether there is data to be transmitted in a PUSCH in uplink component carriers linked to one downlink component carrier; And
(c) transmitting the aperiodic channel state information to the base station based on the determination of the step (b). The method according to claim 6,
In step (b), there is data to be transmitted to the PUSCH in at least one of the uplink component carriers other than the uplink component carrier linked to the at least one downlink component carrier for which the aperiodic channel state information report is requested, and When it is determined that there is no data to be transmitted in the PUSCH in uplink component carriers linked to at least one downlink component carrier,
In step (c), a component carrier having a high priority is selected from uplink component carriers having data to be transmitted to the PUSCH according to a predetermined rule, and the aperiodic channel state information report is transmitted to the base station. How to report aperiodic channel status information. The method according to claim 6,
In step (b), at least one of uplink component carriers except for the uplink component carrier linked to the at least one downlink component carrier for which the aperiodic channel state information report is requested is present, and data to be transmitted to the PUSCH, When it is determined that there is no data to be transmitted in the PUSCH in uplink component carriers linked to at least one downlink component carrier,
In the step (c), the aperiodic channel transmits channel state information through a PUSCH in one of uplink component carriers linked to the at least one downlink component carrier for which the aperiodic channel state information report is requested. How to report status information. The method according to claim 6,
In step (a), the aperiodic channel state information report request includes a carrier indicator (CIF),
In step (b), at least one of uplink component carriers except for the uplink component carrier linked to the at least one downlink component carrier for which the aperiodic channel state information report is requested is present, and data to be transmitted to the PUSCH, When it is determined that there is no data to be transmitted in the PUSCH in uplink component carriers linked to at least one downlink component carrier,
And transmitting the channel state information by using an uplink component carrier designated by the carrier indicator (CIF) in step (c). The method according to claim 6,
An uplink component carrier other than an uplink component carrier linked to the at least one downlink component carrier for which the aperiodic channel state information report is requested in step (b), and linked to the at least one downlink component carrier If it is determined that there is no data to be transmitted on the PUSCH in uplink component carriers,
In step (c), the aperiodic channel state information is transmitted through a PUSCH in one of the uplink component carriers linked to the at least one downlink component carrier for which the aperiodic channel state information report is requested. How to report channel status information. The method according to claim 6,
In step (a), the aperiodic channel state information report request includes a carrier indicator (CIF),
An uplink component carrier other than an uplink component carrier linked to the at least one downlink component carrier for which the aperiodic channel state information report is requested in step (b), and linked to the at least one downlink component carrier If it is determined that there is no data to be transmitted on the PUSCH in uplink component carriers,
And transmitting the channel state information by using an uplink component carrier designated by the carrier indicator (CIF) in step (c).

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