KR20100094961A - The method of transmitting and receiving feedback information, and mobile station and base station apparatus using the same method - Google Patents

Abstract

PURPOSE: A method for transceiving feedback information, and a terminal device and a base station device using the same are provided to drastically increase throughput of a cell boundary user and a mean cell processing amount. CONSTITUTION: A receiving device(310) receives target resource unit information and interference cooperative type information between cells which should be fed back from a serving base station. The interference cooperative type information between cells instructs a type with which interference cooperation between cells is performed. A transmitting device(330) transmits feedback information to the serving base station. The feedback information corresponds to an interference cooperative type between cells for a corresponding resource unit.

Description

The method of transmitting and receiving feedback information, and mobile station and base station apparatus using the same method}

The present invention relates to a method for transmitting and receiving feedback information, and a terminal device and a base station device using the same.

In an Orthogonal Frequency Division Multiple Access (OFDMA) system of a multi-carrier type, resource allocation is performed in units of subchannels composed of subcarriers. That is, a plurality of users divide and share the entire subcarriers, thereby securing a multi-user diversity gain in the frequency domain. In OFDMA-based broadband mobile Internet access systems such as WiBro, the same frequency is reused in all cells, and adaptive modulation and coding (AMC) scheme is applied according to received signal strength and interference between adjacent cells. By applying, the throughput can be maximized.

However, in such a frequency reuse 1 system, interference between adjacent cells is severe at the boundary of a cell or a sector, so that a decrease in throughput is inevitable and a service outage situation is encountered. As a way to improve performance at cell boundaries, orthogonal division of the entire subcarrier into multiple frequency partitions, and the proper placement of these frequency partitions, do not use some partitions in each cell, or at low power levels. The method of mitigating co-channel interference between neighboring cells by using the same is called Fractional Frequency Reuse (FFR).

As described above, the partial frequency reuse technique (hereinafter, abbreviated as 'FFR') is a technique for improving communication performance of a cell edge user in a multi-cell based environment. In general, a cell or sector includes a plurality of frequency partitions in the entire bandwidth, and each frequency partition may be allocated to the terminals under specific conditions, respectively.

In order to apply the FFR in the actual system, it is possible to determine which frequency partition (or band) to use based on the frequency pattern disposed in each cell based on the location information of each terminal. In addition, in a real communication environment, the signal-to-interference ratio is continuously changed in the same band due to fading and mobility of the terminal, so that the signal-to-interference ratio is dynamically reflected to determine which frequency partition to use among the bands allocated to each cell. You may.

Conventionally, when performing PMI cooperation, there is a problem of reducing the average cell throughput. The solution to this problem has not been studied yet.

An object of the present invention is to provide a method for transmitting and receiving feedback information.

An object of the present invention is to provide a terminal device for transmitting feedback information.

An object of the present invention is to provide a base station apparatus for receiving feedback information.

The technical problems to be solved by the present invention are not limited to the technical problems and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

In order to achieve the above technical problem, the method for transmitting feedback information according to the present invention includes target resource unit information to be fed back from a serving base station and inter-cell interference cooperation type information indicating a type to perform interference cooperation between the multiple cells. Receiving; And transmitting feedback information of a type corresponding to the inter-cell interference cooperation type to the serving base station for the resource unit corresponding to the target resource unit information.

In this case, preferably, the target resource unit information may indicate any one of a total bandwidth, a frequency partition having index 0 and a power boosted FFR partition.

Preferably, the inter-cell interference cooperative type information may be instructed to report PMI information to be restricted or PMI information to be recommended among precoding matrix indexes (PMIs) used by one or more neighboring cells.

According to an aspect of the present invention, there is provided a method for transmitting feedback information, the method including: obtaining, by a terminal, FFR configuration information including configuration information about one or more frequency partitions to which a corresponding FFR scheme is applied for each cell ID; And PMI information to be restricted or PMI information to be recommended to a serving base station among PMIs (Precoding Matrix Index) used by one or more neighboring cells in a specific frequency partition to which the UE is allocated using the obtained FFR configuration information. Has a step of transmitting.

In order to achieve the above technical problem, the terminal apparatus for transmitting feedback information according to the present invention provides inter-cell interference coordination indicating a target resource unit information to be fed back from a serving base station and a type for performing cooperative interference between the multiple cells. Receiving means for receiving type information; And transmitting means for transmitting feedback information of a form corresponding to the inter-cell interference cooperation type to the serving base station for the resource unit corresponding to the target resource unit information.

In order to achieve the above technical problem, the terminal apparatus for transmitting feedback information according to the present invention acquires FFR configuration information including configuration information on one or more frequency partitions to which a corresponding FFR scheme is applied for each cell ID. Way; And PMI information to be restricted or PMI information to be recommended to a serving base station among PMIs (Precoding Matrix Index) used by one or more neighboring cells in a specific frequency partition to which the UE is allocated using the obtained FFR configuration information. Means for transmitting.

In accordance with another aspect of the present invention, there is provided a method for receiving feedback information, comprising: receiving target resource unit information to be fed back and inter-cell interference cooperation type information indicating a type to perform interference cooperation between the multiple cells; Transmitting to; And receiving feedback information of a form corresponding to the inter-cell interference cooperation type from the terminal with respect to the resource unit corresponding to the target resource unit information.

In accordance with another aspect of the present invention, there is provided a method for receiving feedback information, wherein the PMI information or PMI (precoding matrix index) used by one or more neighboring cells in a specific frequency partition is desired to be recommended or recommended. Receiving PMI information from a specific terminal; And transmitting the received PMI information to one or more neighboring cells.

In order to achieve the above technical problem, the base station apparatus for receiving feedback information according to the present invention is an inter-cell interference cooperative type indicating a target resource unit information to be fed back and a type to perform interference coordination between the multiple cells. Transmitting means for transmitting information to the terminal; And receiving means for receiving feedback information of a form corresponding to the inter-cell interference cooperative type from the terminal with respect to the resource unit corresponding to the target resource unit information.

In order to achieve the above technical problem, the base station apparatus for receiving the feedback information according to the present invention, PMI information or recommendation to be restricted among PMIs (Precoding Matrix Index) used by one or more neighboring cells in a specific frequency partition Means for receiving PMI information that a user wants to do from a specific terminal; And means for transmitting the received PMI information to one or more neighboring cells.

When the PMI cooperation process is performed by the feedback information transmission of the terminal according to the present invention, the throughput of the cell boundary user as well as the average cell throughput may be remarkably improved. That is, the communication performance of the terminal can be significantly improved.

Effects obtained in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the present invention, provide an embodiment of the present invention and together with the description, illustrate the technical idea of the present invention.
1 is a diagram illustrating an example of an FFR scheme;
2 is a conceptual diagram illustrating a method of transmitting feedback information by a terminal in a multi-cell based environment using FFR;
3 is a block diagram showing a configuration of a preferred embodiment of a terminal device for transmitting feedback information according to the present invention;
4 is a block diagram showing the configuration of a preferred embodiment of a base station apparatus for receiving feedback information according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details. For example, the following detailed description will be described in detail on the assumption that the mobile communication system is a 3GPP LTE system, but is applicable to any other mobile communication system except for the specific matter of 3GPP LTE.

In some instances, well-known structures and devices may be omitted or shown in block diagram form centering on the core functions of the structures and devices in order to avoid obscuring the concepts of the present invention. In addition, the same components will be described with the same reference numerals throughout the present specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

In addition, in the following description, it is assumed that a terminal collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), an advanced mobile station (AMS), and the like. It is also assumed that the base station collectively refers to any node at a network end that communicates with a terminal such as a Node B, an eNode B, a base station, and an access point (AP).

In a mobile communication system, a user equipment may receive information from a base station through downlink, and the terminal may also transmit information through uplink. The information transmitted or received by the terminal includes data and various control information, and various physical channels exist according to the type and purpose of the information transmitted or received by the terminal.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the Institute of Electrical and Electronics Engineers (IEEE) 802.11m, 3GPP system, 3GPP LTE system, and 3GPP2 system, which are wireless access systems. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.

In addition, specific terms used in the following description are provided to help the understanding of the present invention, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present invention.

The term base station used in the present invention may be referred to as a cell or sector when used in a regional concept. In addition, the terminal used in the present invention may be called differently in terms such as a user (user). The serving base station (or cell) may be referred to as a base station (or cell) that provides a main service to the terminal.

1 is a diagram illustrating an example of an FFR scheme.

Referring to FIG. 1, generally, one cell (or sector) may include four frequency partitions F1, F2, F3, and F4 at full bandwidth. The four frequency partitions may be divided into F1, F2 and F3 regions, which are frequency reuse 3 regions, and F4 region, which is frequency reuse 1 region.

Each cell typically assigns an inner (or central) user within the cell to the F4 region, which is frequency reuse 1, because the inner user is typically less affected by interference from other cells than the cell boundary user. . Therefore, each cell can transmit signals to the UE at a large power level, especially for internal users who have allocated resources in the F4 region of frequency reuse 1.

In addition, each cell may allocate the F1, F2, and F3 regions of frequency reuse 3 to a terminal located at a cell boundary and a terminal located inside a cell. In this case, each cell may allocate different frequency partitions among the areas of frequency reuse 3 for the UE located at the cell boundary. For example, the cell A may allocate the F1 region of the frequency reuse 3 region to a terminal located at a cell boundary that may be greatly affected by inter-cell interference. Cell B and cell C may then allocate the F1 region to terminals located inside (or at the center) of the cell, respectively, to transmit signals at low power levels to these terminals. In this case, the terminal located at the boundary of the cell A can receive the downlink signal from the cell A more efficiently with less interference from other cells.

Similarly, cell B can assign the F2 region to a user located at a cell boundary that can be susceptible to intercell interference, and cell A and cell C then assign the F2 region to cell A, inside cell C (or center). Can be assigned to users located at) to send signals to these users at lower power levels. Accordingly, the terminal located at the boundary of the cell B can receive the downlink signal from the cell B more efficiently with less interference from other cells.

In addition, cell C can assign the F3 region to a user located at a cell boundary that is susceptible to intercell interference, and cell A and cell B then assign the F3 region to cell A, cell B (or center). They can be assigned to located users and sent signals to these users at lower power levels. In this case, the terminal located at the boundary of the cell C can receive the downlink signal from the cell C more efficiently with less interference from other cells.

For example, in the case of cell A, when the internal users of cell A are assigned to the areas F2 and F3 among the areas of frequency reuse 3, the cell boundary users are assigned a power level that is relatively smaller than the power level of the assigned F1 area. Can be assigned. Therefore, an internal user assigned to the regions F2 and F3 may receive a signal from the serving cell (cell A) at a power level relatively smaller than that of the cell boundary terminal.

Using this FFR method, each cell can use a relatively large power level in one of the F1, F2, and F3 regions, which is used for a terminal having a poor channel state (for example, a terminal located at a cell boundary). It is desirable to assign.

As described above, using the FFR scheme can improve the communication performance of the terminal located at the cell boundary to some extent. However, in order to further improve communication performance of a cell edge terminal, it is necessary to apply a PMI cooperation (Precoding Matrix Index Coordination) technique.

The PMI coordination technique is one of methods for performing inter-cell interference coordination. The PMI coordination technique is used to provide a terminal belonging to a serving cell with a PMI (or beam pattern of one or more neighboring cells directed to the serving cell) that causes one or more neighboring cells to interfere the most. It is a way of limiting the use or recommending the use of a good PMI (or beam pattern of one or more neighboring cells not directed to the serving cell) where one or more neighboring cells cause the least interference.

That is, the cell boundary terminal may report this to the serving cell so as to limit the use of the PMI that has the greatest interference among the PMIs used by one or more neighboring cells, and conversely, the cell boundary terminal may give the least interference among the PMIs used by the one or more neighboring cells. A report may be made to the serving cell recommending good PMI. Among the PMIs used by one or more neighboring cells, the PMI having the greatest interference may be used when the serving cell and the neighboring cell cooperate with each other to operate in a joint processing mode with the terminal.

In a wireless communication system using a multi-cell based FFR scheme, the FFR configuration for each cell may be set in advance. That is, the FFR configuration including at least one of frequency partition allocation information, power level pattern information, and power level value for each frequency partition for each cell may be set in advance. In this case, the serving base station may signal the preconfigured FFR configuration to the terminal in an index form or the like.

Hereinafter, a brief description will be given of a method in which a UE reports a PMI for one or more neighboring cells (or sectors) to a serving cell.

2 is a conceptual diagram illustrating a method of transmitting feedback information by a terminal in a multi-cell based environment using FFR.

The serving base station (cell) may generally assign a specific frequency partition to the terminal based on link quality that may vary according to the distance (geometry) and the like. As shown in FIG. 1, the serving base station A may allocate a specific frequency partition F1 to the terminal 210 at the cell A boundary. In addition, the serving base station may instruct the terminal 210 at the boundary of the cell A to report only feedback information corresponding to a specific frequency partition F1 (eg, frequency partition having index 0). In this case, the feedback information reported to the serving base station by the terminal 210 may include a channel quality indicator (CQI), a precoding matrix index (PMI), a RANK, and associated information.

In addition, for example in the case of cell A, the serving base station not only instructs the cell boundary terminal 210 to report the feedback information for a specific frequency partition F1 but also reports the feedback information for the entire bandwidths F1 to F4. Can be instructed to do so.

First, a case in which the serving base station instructs or requests the terminal 210 to report feedback information on a specific frequency partition (or may be referred to as a resource unit, a subband, etc.) will be described. In this case, in response to a request or indication from the serving base station, the terminal 210 may report PMI information used by one or more neighboring cells in a specific frequency partition to the serving base station.

In more detail, the terminal 210 uses the PMI that causes the most interference among the PMIs used by one or more neighboring cells in a specific frequency partition (for example, region A to F1) or one or more neighboring cells used. Information on the PMI that causes the least interference among the PMIs may be reported to the serving base station.

In addition to the PMI information, the terminal 210 may report to the serving base station further including interference intensity information due to PMI used by one or more neighboring cells in the F1 region frequency partition.

Also, optionally, the terminal 210 may further include associated information such as a carrier-to-interference plus noise ratio (CINR) variation amount and report it to the serving base station. .

Here, the related information may include strength information of interference due to PMI used by one or more neighboring cells and / or CINR variation information. In addition, the amount of change in the CINR (or SINR) may also be referred to as improved CINR information. CINR (or SINR) variation information is a measured CINR when one or more neighboring cells in a particular frequency partition (eg F1) use the least-interfering good PMI or do not use the most interfering PMI. It may include information corresponding to the difference between the value (or SINR value) and the CINR value (or SINR value) measured before applying the same. The CINR variation information may indicate how much the channel state of the serving cell is improved when the PMI is limited to one or more neighboring cells in a specific frequency partition or when the recommended PMI is used.

As such, the terminal 210 located at the boundary of a specific cell may include information on PMI causing interference of one or more neighboring cells, interference strength information due to PMI used by one or more neighboring cells, or recommend PMI or limited PMI for one or more neighboring cells. In case of applying and not applying, CINR variation information may be reported to the serving base station. That is, the terminal may report one or more of information on PMI, interference strength information, and CINR variation information to the serving base station. In this case, the terminal may combine these information in various forms and report the same to the serving base station.

However, some terminals 220 in the cell maintaining good link quality may not report such PMI information to the serving base station. In the exceptional case of not reporting such PMI information, the terminal 220 may know by explicit signaling from the serving base station or by an implicit indication.

As an example of an implicit indication, the terminal 220 may implicitly know based on frequency partition information allocated for reporting link quality or feedback information. That is, the terminal may not report the feedback information to the serving base station if the terminal has a good link quality or if the terminal has been allocated the F2 and F3 regions in the cell A.

The serving base station may signal a specific frequency partition in which feedback information should be reported to the terminals. Although there is no signaling or indication of a serving base station for a specific frequency partition for reporting PMI information of one or more neighboring cells, the terminal may specify the specific information together with measurement information on PMI and / or related information of one or more neighboring cells in a specific frequency partition. Information about the frequency partition may be transmitted to the serving base station.

Next, a case in which the serving base station instructs or requests reporting of feedback information for a frequency reuse 1 area and a frequency reuse N (N> 1 natural number, hereinafter, N = 3 is described as an example) will be described. .

In response to a request or an indication from the serving base station, the terminals 210 and 220 allocated to the frequency reuse 1 and frequency reuse N regions may report feedback information about one or more neighboring cells to the serving base station, respectively. In addition to the terminal 210 which is allocated a frequency partition of frequency reuse 1 according to the request or instruction, terminals allocated to all frequency partitions corresponding to frequency reuse N or terminals allocated to some frequency partitions corresponding to frequency reuse N may be used. PMI information and / or related information of one or more neighboring cells in the corresponding frequency partition may be reported to the serving base station.

That is, the terminal 210 allocated to the F1 region having frequency reuse 3 and the terminal (eg, 220) allocated to the F4 region having frequency reuse 1 may have PMI information and / or related information of at least one neighboring cell in the corresponding frequency partition. Can be reported to the serving base station.

To help report the feedback information to the serving base stations of the terminals 210 and 220, the serving base station may signal information about the FFR configuration to the terminals 210 and 220. On the other hand, without such signaling, terminals 210 and 220 are targets for reporting PMI information for one or more neighboring cells using a pilot (or midamble) signal and information related to the power boosting level in each frequency partition. The frequency partition (or target resource unit) may be known.

Hereinafter, when considering the PMI cooperation using the PMI information of one or more neighbor cells reported by the terminals 210 and 220, the operation of the base station and the terminal will be briefly described. In general, the serving base station may transmit the modified codebook reflecting the PMI cooperation to one or more neighboring base stations through higher layer signaling.

A UE assigned to a specific frequency partition may not apply PMI cooperation. For example, in FIG. 1 and FIG. 2, the UE allocated to the F4 region, which is a specific frequency partition, may not apply PMI cooperation. This is because the F4 region will generally be allocated to in-cell terminals in each cell. Accordingly, the UE allocated to the F4 region may find a PMI to be used in a preset codebook. That is, the terminal assigned to the F4 region may use a preset codebook for the F4 region, while the terminal allocated to the F1, F2 and / or F3 regions may use the modified codebook.

When the serving base station instructs the terminal to apply inter-cell interference cooperation (eg, PMI cooperation) through explicit signaling, the terminal does not apply PMI cooperation or PMI cooperation according to the assigned frequency partition. You may not. For example, the UE may be allowed to apply PMI cooperation for the F1 to F3 areas while the PMI cooperation may not be allowed for the F4 areas. The terminal not allowed to apply PMI cooperation may not apply PMI cooperation in any frequency partition.

The serving base station may signal to the terminal to apply the PMI cooperation, and also information about a corresponding frequency partition (resource unit) to which the PMI cooperation is to be applied (for example, indicate an overall bandwidth or indicate a specific frequency partition, or The terminal may indicate one or more subbands in which a channel state has recently been reported to the serving base station). For example, the terminal 210 may be allowed to apply the PMI cooperation only in the F1 region through the signaling of the serving base station, whereas the terminal 220 may be in any frequency partition (resource) through the signaling from the serving base station. PMI cooperation may not apply.

In addition, in FIG. 1, for example, the cell A has a high probability that the F2 and / or F3 region is allocated to the terminal inside the cell, and thus the terminal allocated to the F2 and / or F3 region may use a codebook modified by PMI cooperation. have. Since the intra-cell terminal has a close distance from the serving base station, even if the modified codebook is used, there is no significant difference in communication performance. However, the cell boundary terminal allocated to the F1 region and / or the cell internal terminal allocated to the F4 region may use a codebook set in advance without applying PMI cooperation.

PMI cooperation may be performed based on feedback information including PMI information of one or more neighbor cells. Based on the PMI cooperation, the serving base station may modify a preset codebook. For example, the codebook may be modified to limit the PMI used by a particular neighbor cell in a particular frequency partition. The serving base station may inform the modified codebook to neighboring cells through higher layer signaling. The serving base station may inform the one or more neighboring cells of the PMI that the neighboring cell wants to limit or the PMI information that the neighboring cell wants to recommend based on the feedback information reported by the UE through higher layer signaling. have.

Then, the neighbor base station (cell) that has received the restricted or recommended PMI information may not use the restricted PMI or may use the recommended PMI. In addition, the neighbor base station receiving the modified codebook information may inform the terminals in its cell through the specific message (for example, AAI_DL_IM message) the modified codebook information. In this case, the FFR configuration information including the frequency partition information together with the modified codebook information may be informed. Also, the modified codebook information to be used in each frequency partition may be informed to the UE allocated to each frequency partition.

Performing the PMI coordination process as described above can significantly improve the average cell throughput as well as the throughput of the cell boundary user.

Hereinafter, a terminal device and a base station device using the feedback information transmission and reception method according to the present invention will be briefly described.

3 is a block diagram showing the configuration of a preferred embodiment of a terminal device for transmitting feedback information according to the present invention.

Referring to FIG. 3, the terminal device may include a receiving unit 310, an FFR configuration information obtaining unit 320, a transmitting unit 330, and a memory 340.

The receiving unit 310 may receive various signals, information, and data coming from outside such as a serving base station. The receiving unit 310 may receive the target resource unit information to be fed back from the serving base station and the inter-cell interference cooperation type information indicating a type to perform the interference cooperation between the multiple cells.

The FFR configuration information obtaining unit 320 may obtain FFR configuration information including configuration information about one or more frequency partitions to which a corresponding FFR scheme is applied for each cell ID.

The transmitting unit 330 may transmit various kinds of information and signals including feedback information to the serving base station. The transmitting means 330 may transmit feedback information of a form corresponding to the inter-cell interference cooperation type to a serving base station for the resource unit corresponding to the target resource unit information received by the receiving means 310. In addition, the transmission means 330 is a specific frequency partition (index 0 or a power boosted frequency partition) assigned to the terminal using the obtained FFR configuration information or PMI (one or more neighboring cells used in the entire bandwidth) ( PMI information desired to be restricted or PMI information to be recommended among the Precoding Matrix Index) may be transmitted to the serving base station.

The memory 340 may store not only information and data received from the outside but also data processed in the terminal device for a predetermined time. The memory 340 may be replaced with another component such as a buffer (not shown).

 4 is a block diagram showing the configuration of a preferred embodiment of a base station apparatus for receiving feedback information according to the present invention.

Referring to FIG. 4, the base station apparatus may include a receiving means 410, a transmitting means 420, a memory 430, and a processor 440.

The receiving unit 410 may receive feedback information of a form corresponding to the inter-cell interference cooperation type from the terminal with respect to the resource unit corresponding to the target resource unit information. The receiving means 410 may receive, from a specific terminal, PMI information to be restricted or PMI information to be recommended from among precoding matrix indexes (PMIs) used by one or more neighboring cells in a specific frequency partition among the inter-cell interference cooperation types. Can be. And, the receiving means 410 is a signal calculated when the strength or interference level of the signal calculated by applying the PMI information to the one or more adjacent cells in a specific partition from a specific terminal, and the PMI set information is not applied A signal strength gain value or an interference level gain value, which is a value corresponding to a strength or a difference from an interference level, may be received. In addition, the receiving unit 410 may receive interference level information due to the PMI used by the one or more neighbor cells in a specific partition from a specific terminal.

The transmitting means 420 may transmit the target resource unit information to be fed back and the inter-cell interference cooperation type information indicating a type to perform the interference cooperation between the multiple cells to the terminal. The transmitter 420 may transmit the PMI information received by the receiver 410 from the terminal to one or more adjacent cells.

The memory 430 may store not only information and data received from the outside but also data processed in the terminal device for a predetermined time. The memory 430 may be replaced with another component such as a buffer (not shown).

The processor 440 may perform arithmetic processing using information received from the outside.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The foregoing description of the preferred embodiments of the invention disclosed herein has been presented to enable any person skilled in the art to make and use the present invention. While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. For example, those skilled in the art can utilize each of the configurations described in the above-described embodiments in a manner of mutually combining them.

Thus, the present invention is not intended to limit the embodiments presented herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (21)

In a method of transmitting feedback information by a terminal in a multi-cell based wireless communication system using fractional frequency reuse (FFR),
Receiving, from a serving base station, target resource unit information to be fed back and inter-cell interference cooperation type information indicating a type to perform interference cooperation between the multiple cells; And
And transmitting feedback information of a type corresponding to the inter-cell interference cooperation type to the serving base station for the resource unit corresponding to the target resource unit information. The method of claim 1,
The target resource unit information indicates any one of a total bandwidth, a frequency partition having index 0, and a power boosted FFR partition. The method of claim 1,
The inter-cell interference cooperative type information indicates to report PMI information to be restricted or PMI information to be recommended among precoding matrix indexes (PMIs) used by one or more neighboring cells. A terminal apparatus for transmitting feedback information in a multi-cell based wireless communication system using a fractional frequency reuse (FFR) method,
Receiving means for receiving target resource unit information to be fed back from a serving base station and inter-cell interference cooperation type information indicating a type to perform the interference cooperation between the multiple cells; And
And transmission means for transmitting feedback information of a form corresponding to the inter-cell interference cooperation type to the serving base station for the resource unit corresponding to the target resource unit information. A method for receiving feedback information of a base station in a multi-cell based wireless communication system using fractional frequency reuse (FFR),
Transmitting, to the terminal, target resource unit information to be fed back and inter-cell interference cooperation type information indicating a type to perform the interference cooperation between the multiple cells; And
And receiving feedback information of a form corresponding to the inter-cell interference cooperation type from the terminal with respect to the resource unit corresponding to the target resource unit information. A base station apparatus for receiving feedback information in a multi-cell based wireless communication system using a fractional frequency reuse (FFR) method,
Transmitting means for transmitting the target resource unit information to be fed back and the inter-cell interference cooperation type information indicating a type to perform the interference cooperation between the multiple cells to the terminal; And
And receiving means for receiving feedback information of a type corresponding to the inter-cell interference cooperative type from the terminal with respect to the resource unit corresponding to the target resource unit information. In the method for transmitting feedback information in a multi-cell based wireless communication system using a fractional frequency reuse (FFR) method,
Acquiring, by the terminal, FFR configuration information including configuration information about one or more frequency partitions to which an FFR scheme corresponding to each cell ID is applied; And
Using the obtained FFR configuration information, the terminal transmits PMI information to be restricted or PMI information to be recommended to a serving base station among PMIs (Precoding Matrix Index) used by one or more neighboring cells in a specific frequency partition to which the UE is allocated. And transmitting feedback information. The method of claim 7, wherein
Corresponds to the difference between the strength or interference level of the signal calculated by applying the PMI information to the one or more adjacent cells in the specific partition and the signal or interference level of the signal calculated when the PMI set information is not applied. And transmitting the signal strength gain value or the interference level gain value, which is a value, to the serving base station. The method of claim 7, wherein
And transmitting the interference level information due to the PMI used by the one or more neighboring cells to the serving base station in the specific partition. The method of claim 8,
The signal strength or interference level may include a Signal to Interference plus Noise Ratio (SINR) value, a Reference Signal Received Power (RSRP), a Reference Signal Received Quality (RSRQ), and a reference signal. Feedback information transmission method characterized in that it is represented by any one of a reference signal strength indicator (RSSI), propagation delay (PD) and carrier to interference plus noise ratio (CINR) value . A terminal apparatus for transmitting feedback information in a multi-cell based wireless communication system using a fractional frequency reuse (FFR) method,
Means for obtaining FFR configuration information including configuration information about one or more frequency partitions to which a corresponding FFR scheme is applied for each cell ID; And
Using the obtained FFR configuration information, the terminal transmits PMI information to be restricted or PMI information to be recommended to a serving base station among PMIs (Precoding Matrix Index) used by one or more neighboring cells in a specific frequency partition to which the UE is allocated. Terminal device comprising a means for. 12. The method of claim 11,
Corresponds to the difference between the strength or interference level of the signal calculated by applying the PMI information to the one or more adjacent cells in the specific partition and the signal or interference level of the signal calculated when the PMI set information is not applied. And means for transmitting a signal strength gain value or an interference level gain value, which is a value, to the serving base station. 12. The method of claim 11,
And means for transmitting the interference level information due to the PMI used by the one or more neighboring cells to the serving base station in the specific partition. A method for receiving feedback information of a base station in a multi-cell based wireless communication system using fractional frequency reuse (FFR),
Receiving, from a specific terminal, PMI information to be restricted or PMI information to be recommended from among Precoding Matrix Indexes (PMIs) used by one or more neighboring cells in a specific frequency partition; And
And transmitting the received PMI information to one or more neighboring cells. The method of claim 14,
Corresponds to the difference between the strength or interference level of the signal calculated by applying the PMI information to the one or more adjacent cells in the specific partition and the signal or interference level of the signal calculated when the PMI set information is not applied. And receiving a signal strength gain value or an interference level gain value, which is a value, from the specific terminal. The method of claim 14,
And receiving, from the specific terminal, interference level information due to PMI used by the one or more neighboring cells in the specific partition. The method of claim 14,
And determining, by the base station, the PMI to limit use or limit use in the specific partition by using the at least one neighboring cell and the transmitted PMI information. The method of claim 15,
The signal strength or interference level may include a Signal to Interference plus Noise Ratio (SINR) value, a Reference Signal Received Power (RSRP), a Reference Signal Received Quality (RSRQ), and a reference signal. Feedback information receiving method characterized in that it is represented by any one of a reference signal strength indicator (RSSI), propagation delay (PD) and carrier to interference plus noise ratio (CINR) value . A base station apparatus for receiving feedback information in a multi-cell based wireless communication system using a fractional frequency reuse (FFR) method,
Means for receiving, from a specific terminal, PMI information to be restricted or PMI information to be recommended from among Precoding Matrix Indexes (PMIs) used by one or more neighboring cells in a specific frequency partition; And
And means for transmitting the received PMI information to one or more neighboring cells. The method of claim 19,
Corresponds to the difference between the strength or interference level of the signal calculated by applying the PMI information to the one or more adjacent cells in the specific partition and the signal or interference level of the signal calculated when the PMI set information is not applied. And means for receiving from the specific terminal a signal strength gain value or an interference level gain value which is a value. The method of claim 19,
And means for receiving the interference level information due to the PMI used by the one or more neighboring cells from the specific terminal in the specific partition.

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