KR20130015655A - Method and apparatus for avoiding collision of signal in comp system - Google Patents

Abstract

PURPOSE: A signal collision avoiding method and a device therefor are provided to avoid signal collision by preventing signal interference between the RRH(Radio Remote Heads). CONSTITUTION: A muting indication information generating unit(2210) generates muting indication information by considering a CRS(Cell-specific Reference Signal) pattern of an RRH. A transceiver(2230) transmits a signal to a user terminal and receives the signal from the user terminal. The transceiver transmits the muting indication information to the user terminal. A control unit(2220) controls the transceiver to transmit the signal to the user terminal by muting a resource area. [Reference numerals] (2210) Muting indication information generating unit; (2220) Control unit; (2230) Transceiver

Description

Method and apparatus for avoiding signal collision in cooperative wireless communication system {Method and Apparatus for Avoiding Collision of Signal in CoMP System}

The present invention relates to a wireless communication system, and more particularly, in a cooperative wireless communication system in which two or more transmission terminals cooperate to transmit a signal, a cooperative wireless communication system for avoiding collision of signals transmitted by each transmission terminal. And a communication method.

As communications systems evolved, consumers, such as businesses and individuals, used a wide variety of wireless terminals.

Accordingly, communication service providers are continuously attempting to expand the existing communication service market by creating a new communication service market for wireless terminals and providing reliable and inexpensive services.

In current mobile communication systems such as 3GPP, Long Term Evolution (LTE), and LTE-A (LTE Advanced), it is a high-speed, high-capacity communication system that can transmit and receive various data such as video and wireless data, beyond voice-oriented services. In addition, the development of technology that can transfer large amounts of data comparable to wired communication networks is required, and an appropriate error detection method is required to minimize system information loss and improve system transmission efficiency. Doing.

In addition, in various current communication systems, various reference signals or reference signals are provided in order to provide information about a communication environment to an external device through uplink or uplink or downlink. Reference signals, RS), have been proposed.

The reference signal is a predefined signal known to the transmitter and the receiver. This is typically transmitted for the receiver to estimate the signal propagation medium. In the case of downlink, a reference signal such as a cell-specific reference signal (hereinafter referred to as CRS), an MBSFN reference signal, and a UE specific reference signal may be used. The CRS is a reference signal transmitted to all terminals in a cell and used for channel estimation. The MBSFN reference signal may be transmitted in a subframe allocated for MBSFN transmission. The terminal specific reference signal is a reference signal received by a specific terminal or a specific terminal group in a cell, and is mainly used for data demodulation of a specific terminal or a specific terminal group.

The CRS may increase according to the number of antenna ports. For example, if CRS is transmitted using one antenna port at a transmission point, only CRS for antenna port 0 is used. In addition, if 4Tx MIMO transmission is applied to downlink, CRSs for antenna ports 0 to 3 may be used simultaneously.

When cells or RRHs using CRS increase in a cooperative wireless communication environment, interference of the CRS signal between the cells or RRHs may occur. That is, when identification information of each cell or cells and RRHs is different in a cooperative wireless communication environment, there is a need for a method of avoiding signal collision, for example, CRS and PDSCH collision.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for avoiding signal collision to prevent interference between cells or RRHs having various transmission patterns.

In addition, the present invention is to improve the transmission efficiency while reducing the signal interference between the user terminal and the base station of the cooperative wireless communication system and the adjacent cell or RRH.

In order to implement the above-described problem, a method of avoiding signal collision in a cooperative wireless communication system according to an embodiment of the present specification is to avoid a collision with a reference signal transmitted adjacently at a base station providing cooperative wireless communication. Generating muting indication information by considering a cell-specific reference signal (CRS) pattern of an adjacent cell or a radio remote head (RRH), transmitting the muting indication information to a user terminal, and muting the resource region indicated by the muting indication information Transmitting a signal to the user terminal.

In the cooperative wireless communication system according to another embodiment of the present disclosure, a method for avoiding signal collision is performed in order to avoid a collision with a reference signal transmitted adjacent to a user terminal that transmits and receives a signal with a base station providing cooperative wireless communication. Receiving the muting indication information generated from the base station in consideration of a cell-specific reference signal (CRS) pattern of an adjacent cell or a radio remote head (RRH), and receiving a signal from the base station. The received signal is generated by muting a resource region indicated by the muting indication information.

In another embodiment of the present disclosure, an apparatus for avoiding signal collision in a cooperative wireless communication system may include an adjacent cell or an RRH (avoid collision with a reference signal transmitted adjacently at a base station providing cooperative wireless communication). Muting instruction information generation unit for generating muting instruction information in consideration of a CRS (cell-specific reference signal) pattern of a radio remote head, and a transceiver for transmitting and receiving a signal with the user terminal, and transmitting the muting instruction information to the user terminal And a control unit for controlling the transceiver to transmit the signal to the user terminal by muting the resource region indicated by the muting indication information.

An apparatus for avoiding signal collision in a cooperative wireless communication system according to another embodiment of the present disclosure is to avoid a collision with a reference signal transmitted adjacent to a user terminal that transmits and receives a signal with a base station that provides cooperative wireless communication. In order to transmit and receive a signal with the base station, and receiving and receiving the muting indication information generated in consideration of the cell-specific reference signal (CRS) pattern of the adjacent cell or RRH (Radio Remote Head) from the base station, and from the base station And a controller for controlling the transceiver to receive a signal generated by muting a resource region indicated by the muting indication information.

1 is a block diagram illustrating a cooperative wireless communication system to which embodiments are applied.
2 is a block diagram illustrating another cooperative wireless communication system to which embodiments are applied.
3 is a diagram illustrating a configuration of a subframe of Cell A and a configuration of a subframe of Cell B in a CoMP environment to which the JP scheme is applied.
4 is a diagram illustrating a first scheme of JP CoMP according to an embodiment of the present specification.
5 is a view showing a second method of JP CoMP according to an embodiment of the present specification.
FIG. 6 is a diagram illustrating a method of muting PDSCHs of all regions overlapping with a CRS in order to avoid interference or collision of a signal.
7 is a diagram illustrating a CRS pattern when using one antenna according to an embodiment of the present specification.
8 is a view showing a CRS pattern when using two antennas according to an embodiment of the present specification.
9 is a view showing a CRS pattern when using four antennas according to an embodiment of the present specification.
FIG. 10 is a diagram illustrating a case of indicating a CRS pattern to perform muting according to an embodiment of the present specification.
FIG. 11 is a diagram illustrating an example of avoiding a signal collision by using a bitmap of 9 or 6 bits according to an embodiment of the present specification.
FIG. 12 illustrates an example of avoiding collision of a signal using a 4-bit bitmap according to an embodiment of the present specification.
FIG. 13 is a diagram illustrating an example of avoiding a signal collision when a user terminal can confirm or know information on the number of CRS transmit antenna ports according to an embodiment of the present disclosure.
14 is a diagram illustrating an example of avoiding a signal collision in a JMP CoMP system according to an embodiment of the present specification.
15 is a diagram illustrating an example of avoiding a signal collision in a JMP CoMP system according to an embodiment of the present specification.
16 is a diagram illustrating an example of avoiding a signal collision in a JMP CoMP system according to another embodiment of the present specification.
17 is a diagram illustrating an example of avoiding a signal collision in a JMP CoMP system according to another embodiment of the present specification.
18 is a diagram illustrating an example of avoiding a signal collision in a JMP CoMP system according to another embodiment of the present specification.
19 is a diagram illustrating an example of avoiding a signal collision in a JMP CoMP system according to another embodiment of the present specification.
FIG. 20 is a diagram illustrating a process of providing muting indication information at a base station according to an embodiment of the present specification and transmitting a signal by muting the PDSCH accordingly.
FIG. 21 is a diagram illustrating a process of receiving muting indication information from a base station in a user terminal according to an embodiment of the present specification and receiving a muted signal according to the PDSCH.
22 is a diagram illustrating a configuration of a base station or an RRH according to an embodiment of the present specification.
23 is a diagram illustrating a configuration of a user terminal according to an embodiment of the present specification.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Also, the terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings, and the inventor is not limited to the concept of terms in order to describe his invention in the best way. It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be properly defined.

In the current mobile communication systems such as 3GPP, Long Term Evolution (LTE), LTE-A (LTE Advanced), etc., it is a high-speed, high-capacity communication system that can transmit and receive various data such as video and wireless data beyond voice-oriented services. Not only is the development of technology capable of transmitting large amounts of data comparable to wired communication networks, but also the proper error detection method to improve system performance by minimizing the reduction of information loss and increasing system transmission efficiency has become an essential element. .

Meanwhile, a communication system using a multiple-input multiple-output antenna (hereinafter referred to as "MIMO") is used in both the transmitting and receiving ends, and a single UE (SU) or multiple UEs (Multiple UE, MU) is a structure that receives or transmits a signal to one base station by sharing the same radio resource capacity.

In a system using MIMO, a process of identifying a network state or a channel state of a cell using various reference signals or reference signals, and feeding back the result to a transmission terminal (another device) is required.

1 is a block diagram illustrating a cooperative wireless communication system to which embodiments are applied.

The cooperative wireless communication system 100 of FIG. 1 is generally a coordinated multi-point transmission / reception system in which two or more transmitters cooperate to transmit signals (hereinafter, referred to as "cooperative wireless communication"). System "or" CoMP "), a coordinated multi-antenna transmission / reception system or a coordinated multi-cell transmission / reception system, etc. You can also call

In this cooperative wireless communication system 100, two or more, for example, three base stations 110, 112, and 114 allocate the same frequency resources to the same user terminal 120 at the same time when attempting cooperative transmission and reception. To service. That is, three base stations 110, 112, and 114 selected as cooperative base stations at the same time may transmit and receive data with one user terminal 120 using the same frequency resource.

Terminals using such a communication method may be terminals having weaker signal strength than cells in the center region of a cell mainly in an intercell boundary region, and are relatively close to other base stations, and thus may receive signals from two or more base stations. It may be terminals. In the case of heterogeneous networks (Het-Net) in which base stations having different cell coverages of different sizes are overlapped, even if the terminal is not located at the cell edge, the network structure It may be possible to receive signals from more than one base station (eg one pico-cell base station and one macro-cell base station). Since two or more base stations transmit signals in a cooperative manner to these terminals, the terminal may obtain better performance than receiving signals from one base station. At this time, two base stations may cooperate or three or more base stations may cooperate. In addition, the present invention can be applied not only to a single user multiple antenna (SU-MIMO) scheme but also to a multi user multiple antenna (MU-MIMO) scheme.

The cooperative wireless communication system 100 may be widely deployed to provide various communication services such as voice and packet data.

Terminal 120 (User Equipment, UE) in the present specification is a comprehensive concept that means a user terminal in wireless communication, WCDMA and UE (User Equipment) in LTE, HSPA, etc., as well as MS (Mobile Station) in GSM It should be interpreted as a concept that includes a user terminal (UT), a subscriber station (SS), and a wireless device.

One terminal 120 may be connected to two or more base stations (110, 112, 114) at the same time to receive the service, and the plurality of base stations (110, 112, 114) with a plurality of base stations at regular intervals according to the channel situation It may be connected to a base station having a good channel to receive service. Therefore, the base station selected as the cooperative base station should be a base station having a good channel performance for any frequency band for one terminal.

A base station 110, 112, 114, base station (BS) or cell generally refers to a fixed station that communicates with the terminal 120, and is a Node-B or eNodeB. Node-B), BTS (Base Transceiver System), access point (Access Point) may be called other terms.

That is, in the present specification, the base station 110, 112, 114, or cell should be interpreted in a comprehensive sense to indicate some areas covered by a base station controller (BSC) in CDMA, a NodeB in WCDMA, and the like. It is meant to cover all of the various coverage areas such as macrocell, microcell, picocell, femtocell, and so on.

In the present specification, the base stations 110, 113, 114, and the terminal 120 are two transmission / reception entities used to implement the technology or the technical idea described in this specification, and are used in a generic sense and specifically referred to in a term or word. It is not limited by.

There is no limitation on the multiple access scheme applied to the wireless communication system. Various multiple access techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA Can be used.

One embodiment of the present invention can be applied to resource allocation such as asynchronous wireless communication evolving to LTE and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB). have. The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.

In particular, to provide a higher reception sensitivity to a terminal located in a cell or sector boundary area where the reception strength of the radio wave region or the radio wave is relatively weak, and to reduce the interference between cells or to use the radio resources more effectively or to cooperate with one or more transmitters. Signal can be transmitted. In the above, the transmitting end may be a transmitting end belonging to another base station or a transmitting end in charge of another cell belonging to the same base station.

2 is a block diagram illustrating another cooperative wireless communication system to which embodiments are applied.

2, in another cooperative wireless communication system 100 to which embodiments are applied, a base station performing cooperative communication with a terminal 120 may be the macro base stations 110, 112, and 114 illustrated in FIG. 1. However, a femto cell 115, a pico cell 116, a relay 117, a hot spot 118 located within a cell radius of one macro base station 110, 112, 114. Various types of micro or local base stations, such as A network composed of various types of base stations as shown in FIG. 2 is called a heterogeneous network.

If each transmitting end is provided with two or more transmitting antennas and MIMO transmission is possible, the cooperative wireless communication system 100 may not only perform cooperative communication between macro base stations 110, 112, and 114, but also micro base stations or pico base stations. Even among base stations having different driving characteristics such as 115, 116, and 117, superior system performance can be obtained through cooperative communication.

Alternatively, if beamforming or precoding values are set in consideration of only channel conditions with existing base stations during beamforming or precoding, in a cooperative wireless communication system, the base station estimates or interferes with channel conditions with neighboring base stations. It is possible to set the beamforming or precoding value by estimating.

1 and 2, the terminal 120 analyzes reference signals transmitted from each of the base stations 110 through 117 to determine a channel state of each antenna of each base station 110 through 117. After identifying each channel condition, the information is fed back to each base station 120 directly or indirectly. The base stations 110 to 117 or higher layers fed back with this information select base stations that exhibit good channel performance to form a cooperative base station set or a CoMP set, and are included in the cooperative base station set or CoMP set. Will initiate cooperative transmission and reception.

Meanwhile, in the cooperative wireless communication system (eg, CoMP) environment as shown in FIGS. 1 and 2, when each cell or cell identification information (Cell ID) of the radio remote head (RRH) is different, CRS and physical data shared (PDSCH) are different. Collisions may occur between CHannel). Accordingly, muting information (for muting PDSCH for CoMP UEs affected by interference corresponding to CRS transmission of adjacent cells or RRHs forming a CoMP set (CoMP set) together with the specific cell in a specific cell) It is necessary to configure muting information or muting indication information and transmit it to avoid signal collision.

Joint processing (JP) is a method of receiving a signal from two or more RRHs in a CoMP environment. In the JP scheme, the PDSCH for the CoMP UE is influenced by the interference from the CRS of the cells or RRHs in the CoMP set due to the frequency shift of different cell-specific CRSs as shown in FIG. 3. I can receive it.

Here, the frequency shift is due to Cell ID. Therefore, when each cell or cells and RRHs have different Cell IDs in a CoMP environment, CRSs are transmitted with different cell-specific CRS frequency shift values, which constitutes a CoMP set. Since cells or RRHs transmit CRSs in different CRS patterns, PDSCH regions for CoMP UEs corresponding to CRS transmissions of cells or RRHs in the CoMP set are affected by interference.

3 is a diagram illustrating a configuration of a subframe of Cell A and a configuration of a subframe of Cell B in a CoMP environment to which the JP scheme is applied. Cell A and Cell B of FIG. 3 constitute a subframe and a resource block (RB) in a grid in units of RE (Resource Element). In FIG. 3, collision occurs between the CRS region of Cell A and the PDSCH region of Cell B corresponding thereto. Similarly, a collision occurs between the CRS region of Cell B and the PDSCH region of Cell A corresponding thereto. Each colliding area is marked by a dashed arrow. The PDSCH region collided with the channel state information reference signal (CSI-RS) regions of the cell A and the cell B may be muted. When the CoMP UE ignores the signal collision, that is, the interference between the CRS and the PDSCH, performance degradation occurs. Accordingly, in the PDSCH region for the CoMP UE that forms the CoMP set and corresponds to the CRS transmission of neighbor cells or RRHs, as shown in Cell A and Cell B of FIG. 3, the PDSCH is not allocated and transmitted, and muting, that is, zero power ( Zero power).

4 and 5 show two examples of JP CoMP.

4 is a diagram illustrating a first scheme of JP CoMP according to an embodiment of the present specification.

FIG. 4 is a method of transmitting a signal to one given UE at the same time in the same time-frequency resource of a plurality of cells (or cells and RRHs) by the Joint Transmission (JT) method. 4 shows a case of muting a PDSCH region corresponding to a CRS region of an adjacent cell.

5 is a view showing a second method of JP CoMP according to an embodiment of the present specification.

FIG. 5 illustrates a method of transmitting a signal to one given UE by selecting one of the plurality of cells (or cells and RRHs) at a specific time in consideration of interference using DCS. In FIG. 5, since switching is performed, at one point, the switch has a configuration such as 510 or 520. This configuration can be indicated by the DCI and dynamically switched.

FIG. 6 illustrates a method of muting PDSCHs of all regions overlapping with a CRS in order to avoid interference or collision of a signal.

As described above with reference to FIG. 4, when forming a CoMP set, an entire region of symbols including a CRS may be muted. That is, in FIG. 6, muting is performed without transmitting PDSCH for the CoMP UE in the entire region of the symbols including the CRS, that is, in the region where the CRSs of neighboring cells or RRHs in the CoMP set can be transmitted. It can transmit with zero power. However, this causes a problem in that more areas are muted than areas where CRSs of actual neighbor cells or RRHs are transmitted to interfere with the PDSCH for the CoMP UE. As a result, a mappable PDSCH, that is, a data area may be reduced, which may cause a decrease in transmission efficiency, and may also cause a limitation in PDSCH mapping for a CoMP UE.

Accordingly, there is a need for a method of resolving signal collision and improving transmission efficiency of PDSCH by allowing muting only PDSCH for CoMP UE corresponding to an area in which CRSs of adjacent cells or RRHs in a CoMP set are transmitted.

In the present specification, by combining the number of antennas and the CRS pattern, grouping to efficiently provide the CRS pattern information of neighboring cells constituting the CoMP set, it is to propose a method for providing this in an efficient amount of information.

In the present specification, the pattern of the CRS may be implemented as shown in FIGS. 7 to 9 in consideration of the number of antennas and the length (normal / extended) of a cyclic prefix (CP).

In FIGS. 7 to 9, CRS patterns may be a, b, c, d, e, f, A, B, C, AA ', BB', CC 'or a, b, c, d, e, f, A'. , B ', C', and the like, and the pattern is displayed in the CRS signal region RE according to the CRS pattern of the corresponding cell.

7 is a diagram illustrating a CRS pattern when using one antenna according to an embodiment of the present specification. 7 shows possible CRS patterns when one antenna is used in an RRH, a base station, or a cell. The 710 shows a total of six CRS patterns a, b, c, d, e, and f that are possible when one antenna is used in a normal cyclic prefix (CP). On the other hand, 720 shows a total of six CRS patterns a, b, c, d, e, and f that can be used when one antenna is used in an extended CP. The names a, b, c, d, e, and f for the CRS pattern are arbitrarily added and are used to distinguish the location of each CRS pattern, and may be indicated in various ways.

Embodiments for indicating a CRS pattern of a corresponding cell among six CRS patterns may vary. In FIG. 7, a cell identifier (Cell ID) is divided into six, and the CRS pattern is set using the remaining values. . That is, when the Cell ID is 35, 35 mod 6 is 5, and the CRS signal is transmitted in the area RE indicated by "e".

8 is a view showing a CRS pattern when using two antennas according to an embodiment of the present specification. 8 shows possible CRS patterns when two antennas are used in an RRH, a base station, and a cell. Since two antennas are used, two regions can be grouped in a CRS pattern. In the normal CP, 810 shows three CRS patterns A, B, and C that can be used when two antennas are used. Meanwhile, the 820 shows three CRS patterns A, B, and C that can be used when two antennas are used in an extended CP. The names A, B, and C for the CRS pattern are arbitrarily added, and are used to distinguish the positions of the respective CRS patterns, and may be indicated in various ways.

Embodiments for indicating a CRS pattern of a corresponding cell among three CRS patterns may vary. In FIG. 8, a cell identifier (Cell ID) is divided by 6 and the CRS pattern is set using the remaining values. . That is, when the Cell ID is 35, 35 mod 6 is 5, and the CRS signal is transmitted in the area indicated by "C".

Meanwhile, the CRS pattern of FIG. 8 is a bundle of six CRS patterns of FIG. 7. That is, the CRS pattern A of FIG. 8 is a pattern including the CRS patterns a and d of FIG. 7. Therefore, the cell ID is divided into 6, 0 or 3, A, 1 or 4, B, 2 or 5, C may be a CRS pattern. That is, in the case of two antennas, a combination of two CRS patterns having one antenna may be used as one CRS pattern. Of course, the remainder of Cell ID divided by 3 can be used as information for selecting A, B, and C, respectively.

9 is a view showing a CRS pattern when using four antennas according to an embodiment of the present specification. 9 shows possible CRS patterns when four antennas are used in an RRH, a base station, and a cell. Since four antennas are used, the area of FIG. 8 can be extended and grouped in a CRS pattern. In the normal CP, 910 shows three possible CRS patterns AA ', BB', and CC 'when four antennas are used. Meanwhile, the 920 shows three CRS patterns AA ', BB', and CC 'that can be used when four antennas are used in an extended CP. The names AA ', BB', and CC 'for the CRS pattern are arbitrarily added, and are used to distinguish the positions of the respective CRS patterns, and may be indicated in various ways.

7, 8, and 9 mean a CRS pattern of a specific cell. Since a total of six CRS patterns are shown in FIG. 7, three in FIG. 8, and three in FIG. 9, signal muting may be solved when muting is performed in a PDSCH corresponding to a CRS pattern of an adjacent cell.

FIG. 10 is a diagram illustrating a case of indicating a CRS pattern to perform muting according to an embodiment of the present specification.

For example, in a normal CP situation, the CRS pattern a of FIG. 7 may be used in a cell A 1010 using one CSR antenna port as shown in 1011. The CRS signal is transmitted in the area indicated by " a " Meanwhile, in Cell B 1020 using two CRS antenna ports, CRS pattern B of FIG. 8 may be used as shown in 1021. The CRS signal is transmitted in the area indicated by " B " When both cells 1010 and 1020 operate as JT-CoMP, Cell A 1010 can mute the PDSCH only in the CRS region 1021 of Cell B 1020, and the muting region It is indicated by "M" of 1011. Similarly, the Cell B 1020 can mute the PDSCH only in the CRS region (region indicated by a in 1011) of the Cell A 1010, and the muting region is indicated by " M "

That is, since a region to be muted by a cell is a CRS pattern of a cell to which a signal collides, when a CRS pattern of a corresponding cell is informed to a UE, the PDSCH may be muted in the corresponding region.

Hereinafter, a method of informing a CRS pattern of a neighbor cell, in other words, a method of informing a region to be muted in order to avoid signal collision will be described.

Muting information constructed by the methods described below may be dynamically configured or signaled semi-statically. In the case of dynamic transmission, new control information (New DCI format, etc.) may be defined and then included in this information and transmitted, or may be transmitted using code-points remaining in the existing control information. In the case of semi-static signaling, high layer signaling such as RRC may be used.

In the following methods, when the patterns for each CRS shown in FIGS. 7 to 9 are arranged, a total of nine CRS patterns are generated. That is, among the a, b, c, d, e, f, A, B, C, AA ', BB', CC ', A, B, C is derived from a, b, c, d, e, f It is possible. For example, to indicate A, a and d may be provided. In AA ', A is provided in advance, so only A' needs to be provided. Therefore, the CRS pattern of adjacent cells provided to actually indicate muting is a total of nine a, b, c, d, e, f, A ', B', and C '. Of course, in an embodiment of the present specification, a to f are indicated as A, B, and C among the CRS patterns of adjacent cells provided to indicate muting, so that A, B, C, A ', B', and C 'are used. It may be provided as follows. For REs occupying these patterns, when the corresponding REs are in a Physical Downlink Control CHannel (PDCCH) region, PDSCH muting does not occur substantially, but PDCCH transmission is performed. That is, the RE region in which the PDSCH muting occurs means the remaining portions except for the portion used for the control region in the patterns for the respective CRSs shown in FIGS. 7 to 9.

On the other hand, PDSCH muting means muting, that is, transmission with zero power, without allocating PDSCH.

Bits may be configured to provide muting indication information for indicating muting in a specific RE, that is, to provide CRS pattern information of an adjacent cell. In this case, when the CoMP UE allocates and transmits a PDSCH for the CRS pattern corresponding to each bit value, the bit value is 0, and zero power is obtained without allocating the PDSCH in consideration of interference of CRS transmission of neighbor cells or RRHs. In the case of transmission, i.e., muting, a description will be given mainly of configuring the bit value as 1. However, the value of this bit may be configured in reverse depending on the embodiment. That is, when the CoMP UE allocates and transmits a PDSCH for the CRS pattern, the bit value is set to 1, and when the CoMP UE transmits at zero power without allocating the PDSCH in consideration of interference of CRS transmission of neighbor cells or RRHs, that is, when muting It can also be implemented to make the bit value zero. In addition, a position in the bitmap may indicate a specific CRS pattern or a combination of specific CRS patterns in order to connect each CRS pattern and a bitmap, which may be variously modified in the implementation process.

FIG. 11 is a diagram illustrating an example of avoiding a signal collision by using a bitmap of 9 or 6 bits according to an embodiment of the present specification. The example of FIG. 11 may be applied to both the JT scheme or the DCS scheme among the CoMP schemes described above.

11, 1101 shows a 9-bit bitmap. That is, nine bit muting information is constructed by using nine CRS patterns of a, b, c, d, e, f, A ', B', and C 'of FIGS. 7 and 9 as one bit. That is, when the CoMP UE allocates and transmits a PDSCH for a CRS pattern corresponding to each bit value, the CoMP UE transmits the bit value to 0 without transmitting the PDSCH in consideration of interference of CRS transmission of neighbor cells or RRHs. In the case of muting, that is, the bit value can be configured to 1. On the contrary, when the CoMP UE allocates PDSCH to the CRS pattern and transmits the PDSCH, the bit value is set to 1, and in case of transmitting at zero power without allocating the PDSCH in consideration of interference of CRS transmission of neighbor cells or RRHs, that is, muting You can also set the bit value to zero. When the muting information is indicated by a 9-bit bitmap as in 1101, all possible cases are included. That is, the number of CRS transmit antenna ports of a specific cell and the number of CRS transmit antenna ports of adjacent cells forming a CoMP set with the specific cell and interfering with a PDSCH for a CoMP UE, or RRHs may not be considered. . When the number of CRS transmit antenna ports of neighbor cells or RRH is one, the interfering CRS corresponds to one of patterns a, b, c, d, e, and f of FIG. 7, and transmits CRSs of neighbor cells or RRH. If the number of antenna ports is two, the interfering CRS is pattern A (= a + d or d + a), B (= b + e or e + b), C (= c + f or f + c) of FIG. If the number of CRS transmit antenna ports of neighboring cells or RRH is 4, the interfering CRS is pattern A (= a + d or d + a) + A ', B (= corresponds to one of b + e or e + b) + B ', C (= c + f or f + c) + C', and in all cases of CRS pattern for CRS causing interference of adjacent cells or RRHs May be indicated whether the PDSCH is assigned or muted through the bitmap value.

For example, if adjacent cells are the first cell using the CRS pattern a and the second cell using the CRS pattern BB ', the bit indicating the CRS pattern a is 1, and the CRS pattern B is the CRS pattern b. , e (or e, b), so that the bits indicating the CRS patterns b and e are 1, and the bits indicating the CRS pattern B 'are 1. As a result, when 1101 is applied, the base station may provide the terminal with "110010010" as muting indication information. The muted example is the same as 1111. M represents the RE region where muting has occurred.

On the other hand, when using 9 bits, there is an advantage that can be avoided unnecessarily muting the PDSCH, but there is a disadvantage that the amount of information of 9 bits is large. In order to reduce this, a case in which a CRS pattern in case of using one antenna port is not indicated may be considered.

11, 1102 shows a 6-bit bitmap. That is, six bit muting information is constructed by using six CRS patterns A, B, C, A ', B', and C 'of FIGS. 8 and 9 as one bit. That is, when the CoMP UE allocates and transmits a PDSCH for a CRS pattern corresponding to each bit value, the CoMP UE transmits the bit value to 0 without transmitting the PDSCH in consideration of interference of CRS transmission of neighbor cells or RRHs. In the case of muting, the bit value can be configured to 1.

In this case, even if the number of antenna ports of the CRS that interferes is one (that is, the CRS pattern corresponding to one of a, b, c, d, e, and f of FIG. 7), the number of antenna ports of the CRS corresponds to two. A CRS pattern region (ie, a CRS pattern corresponding to one of A, B, and C of FIG. 8) may be indicated. In this case, the number of transmission bits can be reduced.

The CRS A pattern is the sum of the a pattern and the d pattern, the CRS B pattern is the sum of the b pattern and the e pattern, and the CRS C pattern is the sum of the c pattern and the f pattern. Accordingly, the number of CRS transmit antenna ports of a specific cell and the number of CRS transmit antenna ports of adjacent cells or RRHs that form a CoMP set with the specific cell and interfere with a PDSCH for a CoMP UE may not be considered.

When the number of CRS transmit antenna ports of neighbor cells or RRH is one, the interfering CRS corresponds to one of patterns a, b, c, d, e, and f of FIG. 7, and transmits CRSs of neighbor cells or RRH. If the number of antenna ports is two, the interfering CRS is pattern A (= a + d or d + a), B (= b + e or e + b), C (= c + f or f + c) of FIG. If the number of CRS transmit antenna ports of neighboring cells or RRH is 4, the interfering CRS is pattern A (= a + d or d + a) + A ', B (= corresponds to one of b + e or e + b) + B ', C (= c + f or f + c) + C', and in all cases of CRS pattern for CRS causing interference of adjacent cells or RRHs May be indicated whether the PDSCH is assigned or muted through the bitmap value.

However, when the number of neighbor cells or one CRS transmit antenna port of the RRH is one, a wider area is indicated by patterns A, B, and C rather than patterns a, b, c, d, e, and f (over muting).

For example, if the neighbor cells are the first cell using the CRS pattern a and the second cell using the CRS pattern BB ', the bit indicating the CRS pattern A including the CRS pattern a is 1, and the CRS is A bit indicating pattern B is 1 and a bit indicating CRS pattern B 'is 1. As a result, when 1102 is applied, the base station may provide the terminal with "110010" as muting indication information. The muted example is the same as 1121. M represents the RE region where muting has occurred. The areas indicated by the control areas 1111 and 1121 include the CRS signal of the corresponding cell.

FIG. 12 illustrates an example of avoiding collision of a signal using a 4-bit bitmap according to an embodiment of the present specification. The example of FIG. 12 may be applied to both the JT scheme or the DCS scheme among the CoMP schemes described above.

In FIG. 12, a cell that transmits and receives muting information may correspond to a cell where muting occurs, that is, a serving cell, in consideration of PDSCH allocation for CoMP UE or CRS transmission of an adjacent cell / RRH.

As shown in 1210 of FIG. 12, 1 bit and CRS patterns A, B, C or CRS patterns AA ', BB', and CC 'are used as antenna port number indication information indicating whether the number of CRS transmit antenna ports is 2 or 4. It consists of three bits of information.

12 or 1, as indicated by 1201 of FIG. 12, whether the number of CRS transmit antenna ports corresponding to the muting standard, that is, the area indicated by each bit value in the bitmap information, is two or four. When the muting criteria corresponds to two CRS transmit antenna ports, three-bit muting information using three bits of A, B, and C in the case of two CRS transmit antenna ports shown in FIG. By adding, a total of 4 bits of muting indication information can be configured. 1211 is an example.

When the muting criteria corresponds to four CRS transmit antenna ports, AA '(A + A'), BB '(B + B'), and CC '(C) when four CRS transmit antenna ports are shown in FIG. + C ') A total of 4 bits of muting indication information can be configured by adding 3 bits of muting information with each bit being set to 3 CRS patterns. 1212 is an example.

That is, when a CoMP UE allocates and transmits a PDSCH for a CRS pattern corresponding to each bit value, the bit value is 0, and zero power is obtained without allocating the PDSCH in consideration of interference due to CRS transmission of neighbor cells or RRHs. When transmitting, that is, muting, the bit value can be configured to 1.

The number of CRS transmit antenna ports of neighbor cells or RRHs that form a CoMP set with the specific cell and interfere with a PDSCH for a CoMP UE is considered as one bit as mentioned above. When the number of CRS transmit antenna ports of neighbor cells or RRH is one, the interfering CRS corresponds to one of patterns a, b, c, d, e, and f of FIG. 7, and transmits CRSs of neighbor cells or RRH. If the number of antenna ports is two, the interfering CRS is pattern A (= a + d or d + a), B (= b + e or e + b), C (= c + f or f + c) of FIG. If the number of CRS transmit antenna ports of neighboring cells or RRH is 4, the interfering CRS is pattern A (= a + d or d + a) + A ', B (= corresponds to one of b + e or e + b) + B ', C (= c + f or f + c) + C', and in all cases of CRS pattern for CRS causing interference of adjacent cells or RRHs May be indicated whether the PDSCH is assigned or muted through the bitmap value.

However, when the number of neighbor cells or one CRS transmit antenna port of the RRH is one, a wider area is indicated by patterns A, B, and C rather than patterns a, b, c, d, e, and f (over muting).

In addition, even when there are a plurality of neighboring cells nearby, and the antenna port of the cell is composed of two, four is based on the antenna port 4.

For example, it is assumed that the first bit 1201 is 0 when the number of CRS transmit antenna ports is 2, and 1 when the number is 4. If the adjacent cells have a first cell using the CRS pattern A and a second cell using the CRS pattern BB ', the first bit of 1210 is first set to 1 to indicate that the antenna port is 4. In addition, although the CRS pattern A of the first cell should be indicated, the bit indicating the CRS pattern AA 'is 1 based on the four ports, and the bit indicating the CRS pattern BB' of the second cell is 1. As a result, when 1210 is applied, the base station may provide the terminal with "1110" as muting indication information. An example of muting is shown in 1220. M represents the RE region where muting has occurred. The region indicated as the control region of 1220 includes the CRS signal of the corresponding cell.

FIG. 13 is a diagram illustrating an example of avoiding a signal collision when a user terminal can confirm or know information on the number of CRS transmit antenna ports according to an embodiment of the present disclosure. The example of FIG. 13 may be applied to both the JT scheme or the DCS scheme among the CoMP schemes described above.

In FIG. 12, the CRS transmit antenna ports are referred to based on two or four, but this information is provided through 1-bit signaling. However, when the user terminal knows such CRS transmission antenna port information in advance, the 1-bit information of FIG. 12 may be excluded. In FIG. 13, a cell that transmits and receives muting information may correspond to a cell in which muting occurs, that is, a serving cell, in consideration of PDSCH allocation for CoMP UE or CRS transmission of an adjacent cell / RRH.

The user terminal may know in advance whether the number of CRS transmit antenna ports corresponding to the basis of muting, that is, the number of CRS transmit antenna ports corresponding to four areas of each bit value in the bitmap information is two or four.

 That is, the number of CRS transmit antenna ports of adjacent cells or RRHs is limited to two or less in advance, or the number of CRS transmit antenna ports of adjacent cells or RRHs in a specific cell and a specific cell and a CoMP set are all two or less. If known in advance, two antenna ports may be used as a reference, and other antenna ports may be used as a reference. The configuration is the same as that of 1310. More specifically, the case where two antenna ports (AP: 2) is 1311, and the antenna ports may be configured as 1312 when four antennas (AP: 4).

Muting Criteria for Two CRS Transmit Antenna Ports When the CRS transmit antenna ports of FIG. You can organize the information. 1311 is one example.

When the muting criteria corresponds to four CRS transmit antenna ports, AA '(A + A'), BB '(B + B'), and CC '(C) when four CRS transmit antenna ports are shown in FIG. + C ') A total of three bits of muting indication information can be configured by using one bit for each of three CRS patterns. 1312 is an example.

That is, when a CoMP UE allocates and transmits a PDSCH for a CRS pattern corresponding to each bit value, the bit value is 0, and zero power is obtained without allocating the PDSCH in consideration of interference due to CRS transmission of neighbor cells or RRHs. When transmitting, that is, muting, the bit value can be configured to 1.

The number of CRS transmit antenna ports of neighboring cells or RRHs forming a CoMP set with the specific cell and interfering with the PDSCH for the CoMP UE is considered by the user terminal in advance as mentioned above. This is possible by separately instructing by RRC signaling or the like. When the number of CRS transmit antenna ports of neighbor cells or RRH is one, the interfering CRS corresponds to one of patterns a, b, c, d, e, and f of FIG. 7, and transmits CRSs of neighbor cells or RRH. If the number of antenna ports is two, the interfering CRS is pattern A (= a + d or d + a), B (= b + e or e + b), C (= c + f or f + c) of FIG. If the number of CRS transmit antenna ports of neighboring cells or RRH is 4, the interfering CRS is pattern A (= a + d or d + a) + A ', B (= corresponds to one of b + e or e + b) + B ', C (= c + f or f + c) + C', and in all cases of CRS pattern for CRS causing interference of adjacent cells or RRHs May be indicated whether the PDSCH is assigned or muted through the bitmap value.

However, when the number of neighbor cells or one CRS transmit antenna port of the RRH is one, a wider area is indicated by patterns A, B, and C rather than patterns a, b, c, d, e, and f (over muting).

In addition, even when there are a plurality of neighboring cells nearby, and the antenna port of the cell is composed of two, four is based on the antenna port 4.

For example, adjacent cells include a first cell using CRS pattern A and a second cell using CRS pattern BB ', and antenna ports of these first and second cells are checked by the user terminal. Therefore, although the CRS pattern A of the first cell should be indicated, the bit indicating the CRS pattern AA 'is set to 1 based on four ports, and the bit indicating the CRS pattern BB' of the second cell is set to 1. As a result, when 1312 is applied, the base station may provide the terminal with "110" as muting indication information. The muted example is the same as 1320. M represents the RE region where muting has occurred. The region indicated as the control region of 1320 includes the CRS signal of the corresponding cell.

11, 12, and 13 may be applied to a CoMP system of the JT method or the DCS method. Meanwhile, in JMP CoMP, since two or more cells provide the same data, there is no need for muting in a region overlapping with a region where the CRS is transmitted in the corresponding cell.

14 is a diagram illustrating an example of avoiding a signal collision in a JMP CoMP system according to an embodiment of the present specification. The cell that transmits and receives the muting information may correspond to a cell in which muting occurs, that is, a serving cell in consideration of PDSCH allocation for CoMP UE or CRS transmission of a neighbor cell / RRH.

When 9 bitmaps are used in FIG. 11, all the CRS patterns are indicated. However, in the JT method, there is no CRS pattern of an adjacent cell overlapping the corresponding CRS pattern.

Accordingly, when the number of CRS transmit antenna ports of a specific cell, that is, the cell to be muted is 1, only 7 patterns of 9 patterns except the CRS pattern of the corresponding cell may be indicated.

Six CRS patterns a, b, and c in the case where there is one CRS transmit antenna port among the nine CRS patterns of a, b, c, d, e, f, A ', B', and C 'of FIGS. 5 CRS patterns (patterns whose subcarrier indexes differ by 1, 2, 3, 4, 5 in frequency) and CRS except for a pattern used for CRS transmission of the specific cell among d, e, and f In addition to a, b, c, d, e, and f when there are four transmit antenna ports, CRS patterns A ', B', and C 'additionally transmitted have the same frequency as that used for CRS transmission of the specific cell. 7-bit muting information can be composed of two CRS patterns (patterns whose subcarrier indices differ by 1 and 2 in frequency) except for the corresponding pattern, and each of the seven patterns as one bit. .

For example, if the number of CRS transmit antenna ports is 1 in a specific cell and the CRS pattern is b, when the number of CRS transmit antenna ports is 1, the subcarrier index is 1, 2, 3, 4 in frequency. C, d, e, f, a, and C ', A, whose patterns differ in subcarrier indices by 1 and 2, respectively, when the number of CRS transmit antenna ports is 4 ', Bitmap is composed of 7 patterns in total. That is, when 1401 is applied, in the case of the CRS-pattern b of a cell to be muted, muting indication information may be configured in seven patterns as in 1402.

Embodiments of the bitmap of 1401 are the same as 1410. The position in the bitmap of the CRS patterns of 1410 may be modified using information previously promised between the base station and the user terminal.

That is, when the CoMP UE allocates and transmits a PDSCH for a CRS pattern corresponding to each bit value, the CoMP UE transmits the bit value to 0 without transmitting the PDSCH in consideration of interference of CRS transmission of neighbor cells or RRHs. In the case of muting, the bit value can be configured to 1.

The number of CRS transmit antenna ports of neighbor cells or RRHs that form a CoMP set with the specific cell and interfere with a PDSCH for a CoMP UE is not considered. When the number of CRS transmit antenna ports of neighbor cells or RRH is one, the interfering CRS corresponds to one of patterns a, b, c, d, e, and f of FIG. 7, and transmits CRSs of neighbor cells or RRH. If the number of antenna ports is two, the interfering CRS is pattern A (= a + d or d + a), B (= b + e or e + b), C (= c + f or f + c) of FIG. If the number of CRS transmit antenna ports of neighboring cells or RRH is 4, the interfering CRS is pattern A (= a + d or d + a) + A ', B (= corresponds to one of b + e or e + b) + B ', C (= c + f or f + c) + C', and in all cases of CRS pattern for CRS causing interference of adjacent cells or RRHs May be indicated whether the PDSCH is assigned or muted through the bitmap value.

15 is a diagram illustrating an example of avoiding a signal collision in a JMP CoMP system according to an embodiment of the present specification. The cell that transmits and receives the muting information may correspond to a cell in which muting occurs, that is, a serving cell in consideration of PDSCH allocation for CoMP UE or CRS transmission of a neighbor cell / RRH.

When 6 bitmaps are used in FIG. 11, this is to indicate a CRS pattern when the number of antennas is two or more. It is applicable when the number of antennas of a specific cell, that is, the cell to be muted is two.

Four CRS patterns (subcarrier index on frequency) excluding six CRS patterns a, b, c, d, e, and f that are used for CRS transmission of the specific cell among one CRS transmit antenna port Are different from each other by 1, 2, 4, and 5) and CRS patterns A ', B', and C which are additionally transmitted in addition to a, b, c, d, e, and f when there are four CRS transmit antenna ports. Pattern corresponding to the same frequency used for CRS transmission of a specific cell (when there are two CRS transmission antenna ports) or a pattern used for CRS transmission (four CRS transmission antenna ports) Two bit CRS patterns (patterns whose subcarrier indices differ by 1 and 2 in frequency), except for the case), and 6-bit muting information may be configured with one bit for a total of six patterns. That is, it may be configured as 1501 of FIG. 15.

For example, if the number of CRS transmit antenna ports of a specific cell is two and the CRS pattern is B, the CRS pattern B is b + e, and thus CRS-patterns c, d, f, and a except for b and e may be indicated. Can be. That is, when the number of CRS transmit antenna ports is 1, the number of c, d, f, a, and CRS transmit antenna ports, which are patterns having subcarrier indexes different in frequency by 1, 2, 4, and 5, respectively, is 4 In this case, the bitmap is composed of six patterns, C 'and A', in which the subcarrier indices differ by 1 and 2 in frequency. The configuration of the bitmap to which 1501 is applied is 1502.

Embodiments of the bitmap of 1501 are equal to 1510. The position in the bitmap of the CRS patterns of 1510 may be modified using information previously promised between the base station and the user terminal.

That is, when the CoMP UE allocates and transmits a PDSCH for a CRS pattern corresponding to each bit value, the CoMP UE transmits the bit value to 0 without transmitting the PDSCH in consideration of interference of CRS transmission of neighbor cells or RRHs. In the case of muting, the bit value can be configured to 1.

The number of CRS transmit antenna ports of neighbor cells or RRHs that form a CoMP set with the specific cell and interfere with a PDSCH for a CoMP UE is not considered. When the number of CRS transmit antenna ports of neighbor cells or RRH is one, the interfering CRS corresponds to one of patterns a, b, c, d, e, and f of FIG. 7, and transmits CRSs of neighbor cells or RRH. If the number of antenna ports is two, the interfering CRS is pattern A (= a + d or d + a), B (= b + e or e + b), C (= c + f or f + c) of FIG. If the number of CRS transmit antenna ports of neighboring cells or RRH is 4, the interfering CRS is pattern A (= a + d or d + a) + A ', B (= corresponds to one of b + e or e + b) + B ', C (= c + f or f + c) + C', and in all cases of CRS pattern for CRS causing interference of adjacent cells or RRHs May be indicated whether the PDSCH is assigned or muted through the bitmap value.

When the application of FIG. 15 is enlarged, that is, when four antennas of a specific cell are used, a 2-bit bitmap may be used.

In FIGS. 14 and 15, a 7-bit bitmap or a 6-bit bitmap may be used depending on the number of antenna ports of a specific cell to be muted. That is, the method of FIG. 14 may be used when the number of CRS transmit antenna ports of a specific cell is 1, and the method of FIG. 15 may be used when the number of CRS transmit antenna ports of a specific cell is 2/4, but for convenience, the CRS of a specific cell may be used. Regardless of the number of transmit antenna ports, one of the methods of FIG. 14 or FIG. 15 may be used.

16 is a diagram illustrating an example of avoiding a signal collision in a JMP CoMP system according to another embodiment of the present specification. The specific cell that transmits and receives the muting information may correspond to a cell in which muting occurs, that is, a serving cell in consideration of PDSCH allocation for CoMP UE or CRS transmission of a neighbor cell / RRH.

Three CRS patterns of A, B, and C when there are two CRS transmit antenna ports as shown in FIG. 8 and a, b, c, d, e, and f when there are four CRS transmit antenna ports as shown in FIG. In addition, two CRS patterns (subcarrier index is 1 on each frequency except for a pattern corresponding to the same frequency as the pattern used for CRS transmission of the specific cell among the additionally transmitted CRS patterns A ', B', and C ') 5 patterns of muting information can be configured using each bit as one bit for a total of five patterns. The structural example is the same as 1601.

For example, if the number of CRS transmit antenna ports of one cell and the CRS pattern is b, three CRS patterns A, B, C and CRS transmit antennas when the number of CRS transmit antenna ports is 2 When the number of ports is 4, the bitmap is composed of 5 patterns, C 'and A', in which the subcarrier indices differ by 1 and 2 in frequency. This bitmap is the same as 1602. However, when the CRS pattern B (= b + e or e + b) is muted, since b is a pattern for transmitting CRS in a specific cell, the portion muted substantially is e.

That is, when the CoMP UE allocates and transmits a PDSCH for a CRS pattern corresponding to each bit value, the CoMP UE transmits the bit value to 0 without transmitting the PDSCH in consideration of interference of CRS transmission of neighbor cells or RRHs. In the case of muting, the bit value can be configured to 1.

The number of CRS transmit antenna ports of neighbor cells or RRHs that form a CoMP set with the specific cell and interfere with a PDSCH for a CoMP UE is not considered. When the number of CRS transmit antenna ports of neighbor cells or RRH is one, the interfering CRS corresponds to one of patterns a, b, c, d, e, and f of FIG. 7, and transmits CRSs of neighbor cells or RRH. If the number of antenna ports is two, the interfering CRS is pattern A (= a + d or d + a), B (= b + e or e + b), C (= c + f or f + c) of FIG. If the number of CRS transmit antenna ports of neighboring cells or RRH is 4, the interfering CRS is pattern A (= a + d or d + a) + A ', B (= corresponds to one of b + e or e + b) + B ', C (= c + f or f + c) + C', and in all cases of CRS pattern for CRS causing interference of adjacent cells or RRHs May be indicated whether the PDSCH is assigned or muted through the bitmap value.

However, when the number of neighboring cells or the CRS transmit antenna ports of the RRH is one, a wider area may be indicated by patterns A, B, and C rather than patterns a, b, c, d, e, and f. . Embodiments of the bitmap of 1601 are the same as in 1610. The position in the bitmap of the CRS patterns of 1610 may be modified using information previously promised between the base station and the user terminal.

17 is a diagram illustrating an example of avoiding a signal collision in a JMP CoMP system according to another embodiment of the present specification. The specific cell that transmits and receives the muting information may correspond to a cell in which muting occurs, that is, a serving cell in consideration of PDSCH allocation for CoMP UE or CRS transmission of a neighbor cell / RRH.

As shown in FIG. 8, two CRS patterns except for a pattern used for CRS transmission of the specific cell among two A, B, and C CRS transmission antenna ports (subcarrier indexes are 1 and 2 in frequency. Different patterns) and CRS patterns A ', B', and C 'which are additionally transmitted in addition to a, b, c, d, e, and f when four CRS transmit antenna ports are shown in FIG. 9. Two CRS patterns (patterns whose subcarrier indexes differ by 1 and 2 in frequency) except those corresponding to the same frequency as the pattern used for CRS transmission, or are actually used for CRS transmission. 2 CRS patterns (patterns with subcarrier index differences of 1 and 2 in frequency) except for patterns (when there are 4 CRS transmit antenna ports), 4 bits each with one bit for a total of 4 patterns You can configure muting information The. The configuration example is the same as 1701 of FIG.

For example, if the number of CRS transmit antenna ports is 2 and the CRS pattern is B in a specific cell, when the number of CRS transmit antenna ports is 2, the subcarrier index differs by 1 and 2 in frequency. When the number of C, A, and CRS transmit antenna ports, which are patterns, is four, the bitmap is composed of four patterns, C ', A', in which the subcarrier indices differ by 1 and 2 in frequency. Done. This is the same as 1702 of FIG.

That is, when the CoMP UE allocates and transmits a PDSCH for a CRS pattern corresponding to each bit value, the CoMP UE transmits the bit value to 0 without transmitting the PDSCH in consideration of interference of CRS transmission of neighbor cells or RRHs. In the case of muting, the bit value can be configured to 1.

The number of CRS transmit antenna ports of neighbor cells or RRHs that form a CoMP set with the specific cell and interfere with a PDSCH for a CoMP UE is not considered. When the number of CRS transmit antenna ports of neighbor cells or RRH is one, the interfering CRS corresponds to one of patterns a, b, c, d, e, and f of FIG. 7, and transmits CRSs of neighbor cells or RRH. If the number of antenna ports is two, the interfering CRS is pattern A (= a + d or d + a), B (= b + e or e + b), C (= c + f or f + c) of FIG. If the number of CRS transmit antenna ports of neighboring cells or RRH is 4, the interfering CRS is pattern A (= a + d or d + a) + A ', B (= corresponds to one of b + e or e + b) + B ', C (= c + f or f + c) + C', and in all cases of CRS pattern for CRS causing interference of adjacent cells or RRHs May be indicated whether the PDSCH is assigned or muted through the bitmap value.

However, when the number of neighbor cells or one CRS transmit antenna port of the RRH is one, a wider area is indicated by patterns A, B, and C rather than patterns a, b, c, d, e, and f (over muting).

Embodiments of the bitmap of 1701 are the same as 1710. The position in the bitmap of the CRS patterns of 1710 may be modified by using information previously promised between the base station and the user terminal. 17, that is, when four antennas of a specific cell are used, a 2-bit bitmap may be used.

In FIGS. 16 and 17, a 5 bit bitmap or a 4 bit bitmap may be used according to the number of antenna ports of a specific cell to be muted. That is, the method of FIG. 16 may be used when the number of CRS transmit antenna ports of a specific cell is 1, and the method of FIG. 17 may be used when the number of CRS transmit antenna ports of a specific cell is 2/4, but for convenience, the CRS of a specific cell may be used. Regardless of the number of transmit antenna ports, one of the methods of FIG. 16 or 17 may be used.

18 is a diagram illustrating an example of avoiding a signal collision in a JMP CoMP system according to another embodiment of the present specification. The specific cell that transmits and receives the muting information may correspond to a cell in which muting occurs, that is, a serving cell in consideration of PDSCH allocation for CoMP UE or CRS transmission of a neighbor cell / RRH.

As shown in 1801 of FIG. 18, 1 bit indicates whether the number of CRS transmit antenna ports corresponding to a muting criterion, that is, the number of CRS transmit antenna ports corresponding to an area indicated by each bit value in the bitmap information. When the muting criterion corresponds to the number of two CRS transmit antenna ports, two CRSs except for the pattern used for CRS transmission of the specific cell among A, B, and C when two CRS transmit antenna ports are shown in FIG. Each of the patterns (patterns having subcarrier indices of 1 and 2 on the frequency) may be 2-bit muting information, with each bit being one bit. 3 bits in total, 1811 is an example.

When the muting criteria corresponds to four CRS transmit antenna ports, AA '(A + A'), BB '(B + B'), and CC '(C) when four CRS transmit antenna ports are shown in FIG. + C ') corresponding pattern on the same frequency as the pattern used for CRS transmission of the specific cell (when CRS transmission antenna port is 1/2) or pattern used for CRS transmission (CRS transmission) 3 bits muting by adding 2 bits of muting information with 2 bits of each CRS pattern (patterns whose subcarrier indexes differ by 1 and 2 in frequency) except for 4 antenna ports. Instruction information can be configured. 1812 is an example.

For example, if the number of CRS transmit antenna ports is 2 and the CRS pattern is B in a specific cell, when the number of CRS transmit antenna ports is 2, the subcarrier index differs by 1 and 2 in frequency. When the number of C, A, or CRS transmit antenna ports is 4, the subcarrier index differs by 1 and 2, respectively, C + C ', A + A'. When the number of antenna ports is 2 or if the number of antenna ports is 4 or if the number of antenna ports is 4 One bit information indicating whether a corresponding CRS pattern is also included is additionally configured. That is, when the additionally configured bit value is 0 (or vice versa, 1), only the CRS pattern corresponding to the case where the number of antenna ports is 2 is the area where interference is caused by neighboring cells or CRS transmission of the RRH. It is recognized as a region to be identified, and the muting information of the CRS pattern C or A pattern is grasped from the remaining two bit values to allocate or mute the PDSCH. If the additionally configured bit value is 1 (or vice versa, 0), neighboring cells or the area to be interfered with by the CRS transmission of the RRH are also included in the corresponding CRS pattern when the number of antenna ports is 4 The CRS pattern C + C 'or A + A' pattern is PDSCH assigned or muted from the remaining two bit values.

That is, when the CoMP UE allocates and transmits a PDSCH for a CRS pattern corresponding to each bit value, the CoMP UE transmits the bit value to 0 without transmitting the PDSCH in consideration of interference of CRS transmission of neighbor cells or RRHs. In the case of muting, the bit value can be configured to 1.

The number of CRS transmit antenna ports of neighbor cells or RRHs that form a CoMP set with the specific cell and interfere with a PDSCH for a CoMP UE is considered as one bit as mentioned above. When the number of CRS transmit antenna ports of neighbor cells or RRH is one, the interfering CRS corresponds to one of patterns a, b, c, d, e, and f of FIG. 7, and transmits CRSs of neighbor cells or RRH. If the number of antenna ports is two, the interfering CRS is pattern A (= a + d or d + a), B (= b + e or e + b), C (= c + f or f + c) of FIG. If the number of CRS transmit antenna ports of neighboring cells or RRH is 4, the interfering CRS is pattern A (= a + d or d + a) + A ', B (= corresponds to one of b + e or e + b) + B ', C (= c + f or f + c) + C', and in all cases of CRS pattern for CRS causing interference of adjacent cells or RRHs May be indicated whether the PDSCH is assigned or muted through the bitmap value.

In addition, even when there are a plurality of neighboring cells nearby, and the antenna port of the cell is composed of two, four is based on the antenna port 4.

Embodiments of the bitmap of 1810 are the same as 1820. The location in the bitmap of the CRS patterns of 1820 may be modified using information previously promised between the base station and the user terminal. However, when the number of neighbor cells or one CRS transmit antenna port of the RRH is one, a wider area is indicated by patterns A, B, and C rather than patterns a, b, c, d, e, and f (over muting).

19 is a diagram illustrating an example of avoiding a signal collision in a JMP CoMP system according to another embodiment of the present specification.

In FIG. 18, the CRS transmission antenna ports are referred to based on two or four, but the information is provided through 1-bit signaling. However, when the user terminal knows such CRS transmission antenna port information in advance, the 1-bit information of FIG. 18 may be excluded. In FIG. 19, a cell that transmits and receives muting information may correspond to a cell in which muting occurs, that is, a serving cell in consideration of PDSCH allocation for CoMP UE or CRS transmission of an adjacent cell / RRH.

The user terminal may know in advance whether the number of CRS transmit antenna ports corresponding to the basis of muting, that is, the number of CRS transmit antenna ports corresponding to four areas of each bit value in the bitmap information is two or four.

 That is, the number of CRS transmit antenna ports of adjacent cells or RRHs is limited to two or less in advance, or the number of CRS transmit antenna ports of adjacent cells or RRHs in a specific cell and a specific cell and a CoMP set are all two or less. If known in advance, two antenna ports may be used as a reference, and other antenna ports may be used as a reference. The configuration is the same as that of 1910. More specifically, the case of two antenna ports (AP: 2) is 1911, and the case of four antenna ports (AP: 4) may be configured as 1912.

When the muting criterion corresponds to the number of two CRS transmit antenna ports, two CRSs except for the pattern used for CRS transmission of the specific cell among A, B, and C when two CRS transmit antenna ports are shown in FIG. Each of the patterns (patterns having subcarrier indices of 1 and 2 on the frequency) may be 2-bit muting information, with each bit being one bit. 1911 is an example.

When the muting criteria corresponds to four CRS transmit antenna ports, AA '(A + A'), BB '(B + B'), and CC '(C) when four CRS transmit antenna ports are shown in FIG. + C ') corresponding pattern on the same frequency as the pattern used for CRS transmission of the specific cell (when CRS transmission antenna port is 1/2) or pattern used for CRS transmission (CRS transmission) 3 bits muting by adding 2 bits of muting information with 2 bits of each CRS pattern (patterns whose subcarrier indexes differ by 1 and 2 in frequency) except for 4 antenna ports. Instruction information can be configured. 1912 is an example.

For example, if the number of CRS transmit antenna ports is 2 and the CRS pattern is B in a specific cell, when the number of CRS transmit antenna ports is 2, the subcarrier index differs by 1 and 2 in frequency. When the number of C, A, or CRS transmit antenna ports is 4, the subcarrier index differs by 1 and 2, respectively, C + C ', A + A'. You will construct a bitmap. More specifically, for example, when an area subjected to interference due to CRS transmission of neighbor cells or RRH is an area corresponding only to a corresponding CRS pattern when the number of antenna ports is two (assuming that the CoMP UE is known in advance), PDSCH allocation or muting of the CRS pattern C or A pattern is performed from a 2-bit value. If the area that is subject to interference due to CRS transmission of neighbor cells or RRH is also included in the corresponding CRS pattern when the number of antenna ports is 4 (assuming that the CoMP UE is known in advance), the CRS is determined from a 2-bit value. PDSCH allocation or muting of the pattern C + C 'or A + A' pattern.

That is, when the CoMP UE allocates and transmits a PDSCH for a CRS pattern corresponding to each bit value, the CoMP UE transmits the bit value to 0 without transmitting the PDSCH in consideration of interference of CRS transmission of neighbor cells or RRHs. In the case of muting, the bit value can be configured to 1.

The number of CRS transmit antenna ports of neighbor cells or RRHs that form a CoMP set with the specific cell and interfere with a PDSCH for a CoMP UE is considered by the user terminal in advance as mentioned above. This is possible by separately instructing by RRC signaling or the like. When the number of CRS transmit antenna ports of neighbor cells or RRH is one, the interfering CRS corresponds to one of patterns a, b, c, d, e, and f of FIG. 7, and transmits CRSs of neighbor cells or RRH. If the number of antenna ports is two, the interfering CRS is pattern A (= a + d or d + a), B (= b + e or e + b), C (= c + f or f + c) of FIG. If the number of CRS transmit antenna ports of neighboring cells or RRH is 4, the interfering CRS is pattern A (= a + d or d + a) + A ', B (= corresponds to one of b + e or e + b) + B ', C (= c + f or f + c) + C', and in all cases of CRS pattern for CRS causing interference of adjacent cells or RRHs May be indicated whether the PDSCH is assigned or muted through the bitmap value.

However, when the number of neighbor cells or one CRS transmit antenna port of the RRH is one, a wider area is indicated by patterns A, B, and C rather than patterns a, b, c, d, e, and f (over muting).

In addition, even when there are a plurality of neighboring cells nearby, and the antenna port of the cell is composed of two, four is based on the antenna port 4. Embodiments of the bitmap of 1910 are the same as 1920. The location in the bitmap of the 1920 CRS patterns may be modified by using information previously promised between the base station and the user terminal.

비트 (N은 DCS 대상이 되는 셀의 개수로, 예를 들어 4개의 셀이라면 2비트 정보로 지시할 수 있음)로 별도로 정의한 후, 각각의 비트 값에 따라 UE에게 신호를 전송할 셀(혹은 RRH)을 선택한다. 이 때, 상기 해당 셀(혹은 RRH)의 셀 아이디(cell ID)에 근거하여 CRS가 전송되며, PDSCH 뮤팅은 따로 일어나지 않는다. The methods of FIGS. 14 to 19 are particularly applicable to JT-CoMP, and other signaling bits may be defined for DCS. For example, one bit for DCS

N (N is the number of cells subject to DCS, for example, 4 cells can be indicated by 2 bits of information) and then separately to the cell to transmit a signal to the UE according to each bit value (or RRH) Select. At this time, the CRS is transmitted based on the cell ID of the corresponding cell (or RRH), and no PDSCH muting takes place.

비트의 정보로부터 사용자 단말를 위해 선택된 셀이 무엇인지를 동적으로 상기 사용자 단말에게 전송한다. 이 때 JP-CoMP로 동작하는 경우인지 혹은 DCS로 동작하는 경우인지는 따로 명시적(explicit)으로 시그널링 하거나, 미리 시스템상에서 내재적(implicit)으로 알 수도 있으며, 또는 JP-CoMP로 동작하는 경우에 PDSCH 뮤팅을 위해 사용되는 비트 수와 DCS로 동작하는 경우에 동적으로 셀을 선택하기 위해서 사용되는 비트 수의 차이로부터 알 수도 있다.Therefore, bits (2 to 7 bits) used in the methods applicable to the JT-CoMP may not be used for the DCS. In this case, when operating in JP-CoMP, the PDSCH muting information corresponding to the CRS of adjacent cells or RRHs is transmitted to the user terminal using the 2 to 7 bits. In the case of DCS, 1 bit or

From the information of the bits, the cell selected for the user terminal is dynamically transmitted to the user terminal. In this case, whether it is operated by JP-CoMP or DCS can be explicitly signaled separately, or it can be known implicitly in advance in the system, or PDSCH when operating by JP-CoMP. It may be known from the difference between the number of bits used for muting and the number of bits used for dynamically selecting a cell when operating with DCS.

비트)로 동적으로 선택된 셀 정보를 UE에게 지시한다면, 일단 JP-CoMP로 동작하는 경우인지 혹은 DCS로 동작하는 경우인지는 명시적(explicit) 시그널링, 시스템상에서 내재적(implicit) 지시, 또는 각 경우에 사용되는 비트 수의 차이로부터 알 수도 있을 것이다. 이 때 만약 JP-CoMP로 동작하는 것을 인식한다면, 3비트 정보로부터 UE는 PDSCH 뮤팅을 수행하게 될 것이다 (이 때 CRS는 UE가 속해 있는 셀(혹은 RRH)의 셀 아이디에 따라 전송 될 것이다). 만약 DCS로 동작하는 경우에는 두 개(혹은 N개)의 셀(혹은 RRH) 중 UE에게 신호를 전송하기 위해 선택된 셀(혹은 RRH)이 무언인지를 UE는 알 수 있을 것이며, 상기 해당 셀(혹은 RRH)의 셀 아이디(cell ID)에 근거하여 CRS가 전송되며, PDSCH 뮤팅은 따로 일어나지 않는다.For example, in the case of JP-CoMP, the PDSCH muting information is indicated to the UE in 3 bits, and in the DCS, 1 bit (or

Instructing the UE to dynamically select the cell information in bits), whether it is operating in JP-CoMP or DCS, explicit signaling, implicit indication in the system, or in each case It may be known from the difference in the number of bits used. At this time, if it recognizes that it operates in JP-CoMP, the UE will perform PDSCH muting from the 3-bit information (CRS will be transmitted according to the cell ID of the cell (or RRH) to which the UE belongs). If operating in DCS, the UE will know what is selected among two (or N) cells (or RRHs) to transmit a signal to the UE (or RRH), and the corresponding cell (or The CRS is transmitted based on the cell ID of the RRH, and no PDSCH muting takes place.

FIG. 20 is a diagram illustrating a process of providing muting indication information at a base station according to an embodiment of the present specification and transmitting a signal by muting the PDSCH accordingly.

In order to avoid collision with reference signals transmitted from adjacent base stations in the cooperative wireless communication, muting indication information is considered in consideration of a cell-specific reference signal (CRS) transmission pattern of an adjacent cell or a radio remote head (RRH). It generates (S2010). Examples of the muting indication information are the same as those of FIGS. 11 to 19 in which a bitmap of 2 to 9 bits is configured by using the CRS patterns shown in FIGS. 7, 8, and 9. Thereafter, the generated muting indication information is transmitted to the user terminal (S2020). The muting indication information may be dynamically configured or signaled semi-statically. In the case of dynamic transmission, new control information (New DCI format, etc.) may be defined and then included in this information and transmitted, or may be transmitted using code points remaining in the existing control information. In the case of semi-static signaling, high layer signaling such as RRC may be used.

In operation S2030, the signal is transmitted to the user terminal by muting the signal from the resource RE indicated by the muting indication information. As described above, it includes PDSCH muting.

The muting indication information may be the same as the CRS pattern indicating a resource used by the neighbor cell or the RRH to transmit the CRS, or may include two or more CRS patterns. For example, when the CRS pattern of the neighbor cell / RRH is a or d, the muting indication information is set to the CRS pattern A.

In addition, the user terminal can select and determine the muting indication information according to the number of antennas of the adjacent cell. For example, when the muting indication information includes information indicating the number of antennas to which the adjacent cell or the RRH is to transmit CRS (in case of FIGS. 12 and 18), two or more CRSs are located at the same bit position in the bitmap. The patterns are matched and one of the two or more CRS patterns may be identified according to the number of antennas. Of course, when the user terminal confirms the number of antennas of neighbor cells in advance (in case of FIGS. 13 and 10), two or more CRS patterns are matched to the same bit position, and according to the number of antennas checked by the user terminal. One or more CRS patterns of two or more CRS patterns may be identified.

On the other hand, in CoMP of the JT method, it can be indicated except for the CRS pattern of the cell to indicate muting. That is, the muting indication information may be implemented to indicate some of the CRS patterns except for the CRS pattern used by the base station. It has been described in the embodiment of FIGS. 14 to 19.

Meanwhile, in CoMP of the DCS scheme, the muting indication information may be information indicating a cell to which the user terminal switches.

Although not shown in FIG. 20, in order to generate the muting indication information, the CRS pattern of the neighbor cell / RRH may be checked.

FIG. 21 is a diagram illustrating a process of receiving muting indication information from a base station in a user terminal according to an embodiment of the present specification and receiving a muted signal according to the PDSCH.

The process of the user terminal of FIG. 21 may be applied as a method for avoiding collision with a reference signal transmitted adjacently by a user terminal transmitting and receiving a signal with a base station providing cooperative wireless communication.

The user terminal receives muting indication information generated in consideration of a cell-specific reference signal (CRS) transmission pattern of an adjacent cell or a radio remote head (RRH) from the base station (S2110).

Examples of the muting indication information are the same as those of FIGS. 11 to 19 in which a bitmap of 2 to 9 bits is configured by using the CRS patterns shown in FIGS. 7, 8, and 9. The muting indication information may be dynamically configured or signaled semi-statically. In the case of dynamic transmission, new control information (New DCI format, etc.) may be defined and then included in this information and transmitted, or may be transmitted using code points remaining in the existing control information. In the case of semi-static signaling, high layer signaling such as RRC may be used.

In operation S2120, a signal from which a signal is muted in a resource RE indicated by the muting indication information is muted. As described above, it includes PDSCH muting.

The muting indication information may be the same as the CRS pattern indicating a resource used by the neighbor cell or the RRH to transmit the CRS, or may include two or more CRS patterns. For example, when the CRS pattern of the neighbor cell / RRH is a or d, the muting indication information is set to the CRS pattern A.

In addition, the user terminal can select and determine the muting indication information according to the number of antennas of the adjacent cell. For example, when the muting indication information includes information indicating the number of antennas to which the adjacent cell or the RRH is to transmit CRS (in case of FIGS. 12 and 18), two or more CRSs are located at the same bit position in the bitmap. The patterns are matched and one of the two or more CRS patterns may be identified according to the number of antennas. Of course, when the user terminal confirms the number of antennas of neighbor cells in advance (in case of FIGS. 13 and 10), two or more CRS patterns are matched to the same bit position, and according to the number of antennas checked by the user terminal. One or more CRS patterns of two or more CRS patterns may be identified.

On the other hand, in CoMP of the JT method, it can be indicated except for the CRS pattern of the cell to indicate muting. That is, the muting indication information may be implemented to indicate some of the CRS patterns except for the CRS pattern used by the base station. It has been described in the embodiment of FIGS. 14 to 19.

Meanwhile, in CoMP of the DCS scheme, the muting indication information may be information indicating a cell to which the user terminal switches.

22 is a diagram illustrating a configuration of a base station or an RRH according to an embodiment of the present specification.

The apparatus of FIG. 22 may be a base station or an RRH or a component constituting the base station / RRH in a configuration for avoiding collision with a reference signal transmitted adjacently by a base station providing cooperative wireless communication. The component includes a muting instruction information generator 2210, a controller 2220, and a transceiver 2230. The transceiver 2230 transmits and receives a signal with the user terminal.

The muting indication information generator 2210 generates muting indication information in consideration of a cell-specific reference signal (CRS) transmission pattern of an adjacent cell or a radio remote head (RRH). Examples of the muting indication information are the same as those of FIGS. 11 to 19 in which a bitmap of 2 to 9 bits is configured by using the CRS patterns shown in FIGS. 7, 8, and 9. The muting indication information may be the same as the CRS pattern indicating a resource used by the neighbor cell or the RRH to transmit the CRS, or may include two or more CRS patterns. For example, when the CRS pattern of the neighbor cell / RRH is a or d, the muting indication information is set to the CRS pattern A.

In addition, the user terminal can select and determine the muting indication information according to the number of antennas of the adjacent cell. For example, when the muting indication information includes information indicating the number of antennas to which the adjacent cell or the RRH is to transmit CRS (in case of FIGS. 12 and 18), two or more CRSs are located at the same bit position in the bitmap. The patterns are matched and one of the two or more CRS patterns may be identified according to the number of antennas. Of course, when the user terminal confirms the number of antennas of neighbor cells in advance (in case of FIGS. 13 and 10), two or more CRS patterns are matched to the same bit position, and according to the number of antennas checked by the user terminal. One or more CRS patterns of two or more CRS patterns may be identified.

On the other hand, in CoMP of the JT method, it can be indicated except for the CRS pattern of the cell to indicate muting. That is, the muting indication information may be implemented to indicate some of the CRS patterns except for the CRS pattern used by the base station. It has been described in the embodiment of FIGS. 14 to 19.

Meanwhile, in CoMP of the DCS scheme, the muting indication information may be information indicating a cell to which the user terminal switches.

The transceiver 2230 transmits the muting indication information to the user terminal. The muting indication information may be dynamically configured or signaled semi-statically. In the case of dynamic transmission, new control information (New DCI format, etc.) may be defined and then included in this information and transmitted, or may be transmitted using code points remaining in the existing control information. In case of semi-static signaling, high layer signaling such as RRC may be used.

Thereafter, the controller 2220 controls the transceiver 2230 to mute a signal from the resource RE indicated by the muting indication information and transmit the signal to the user terminal. As described above, it includes PDSCH muting.

Although not shown in FIG. 20, in order to generate the muting indication information, the CRS pattern of the neighbor cell / RRH may be checked.

23 is a diagram illustrating a configuration of a user terminal according to an embodiment of the present specification.

The apparatus of FIG. 23 is for preventing a collision between a base station for providing cooperative wireless communication and a user terminal that transmits and receives a signal to a reference signal transmitted adjacent thereto. The apparatus of FIG. 23 may be the user terminal itself, or may constitute a user terminal. It can also be a component.

It consists of a transceiver 2310 and a controller 2320 for transmitting and receiving signals with the base station.

The transceiver 2310 transmits and receives a signal with the base station, and receives muting indication information generated in consideration of a cell-specific reference signal (CRS) transmission pattern of an adjacent cell or a radio remote head (RRH) from the base station.

Examples of the muting indication information are the same as those of FIGS. 11 to 19 in which a bitmap of 2 to 9 bits is configured by using the CRS patterns shown in FIGS. 7, 8, and 9. The muting indication information may be dynamically configured or signaled semi-statically. In the case of dynamic transmission, new control information (New DCI format, etc.) may be defined and then included in this information and transmitted, or may be transmitted using code points remaining in the existing control information. In case of semi-static signaling, high layer signaling such as RRC may be used. The muting indication information may be the same as the CRS pattern indicating a resource used by the neighbor cell or the RRH to transmit the CRS, or may include two or more CRS patterns. For example, when the CRS pattern of the neighbor cell / RRH is a or d, the muting indication information is set to the CRS pattern A.

In addition, the user terminal can select and determine the muting indication information according to the number of antennas of the adjacent cell. For example, when the muting indication information includes information indicating the number of antennas to which the adjacent cell or the RRH is to transmit CRS (in case of FIGS. 12 and 18), two or more CRSs are located at the same bit position in the bitmap. The patterns are matched and one of the two or more CRS patterns may be identified according to the number of antennas. Of course, when the user terminal confirms the number of antennas of neighbor cells in advance (in case of FIGS. 13 and 10), two or more CRS patterns are matched to the same bit position, and according to the number of antennas checked by the user terminal. One or more CRS patterns of two or more CRS patterns may be identified.

On the other hand, in CoMP of the JT method, it can be indicated except for the CRS pattern of the cell to indicate muting. That is, the muting indication information may be implemented to indicate some of the CRS patterns except for the CRS pattern used by the base station. It has been described in the embodiment of FIGS. 14 to 19.

Meanwhile, in CoMP of the DCS scheme, the muting indication information may be information indicating a cell to which the user terminal switches.

In addition, the controller 2320 controls the transceiver 2310 to receive a signal, which is muted in the resource indicated by the muting indication information from the base station. Muting the signal includes PDSCH muting.

In this specification, a method and apparatus for avoiding CRS and PDSCH collisions that may occur when each cell, or a cell ID of a cell and RRHs, are different in a CoMP environment are provided. In more detail, in a specific cell, muting indication information (for muting PDSCH for a CoMP UE affected by interference corresponding to CRS transmission of neighbor cells or RRHs forming a CoMP set together with the specific cell) Muting information) is configured and transmitted. In addition, although the bits are used to transmit the muting information or the muting indication information more efficiently, the user terminal can extract the muting information sufficiently even in the small bits.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (16)

In order to avoid collision with a reference signal transmitted adjacently at a base station that provides cooperative wireless communication,
Generating muting indication information by considering a cell-specific reference signal (CRS) pattern of an adjacent cell or a radio remote head (RRH) and transmitting the muting indication information to a user terminal; And
And muting the resource region indicated by the muting indication information to transmit a signal to the user terminal.
The method of claim 1,
And the muting indication information comprises a bitmap of 2 to 9 bits indicating the CRS pattern.
The method of claim 1,
Wherein the muting indication information is the same as a CRS pattern representing a resource used by the adjacent cell or RRH to transmit a CRS, or includes two or more CRS patterns.
The method of claim 2,
The muting indication information includes information indicating the number of antennas used by the adjacent cell or RRH to transmit CRS.
In the bitmap, two or more CRS patterns are matched to the same bit position, and the CRS pattern of any one or more of the two or more CRS patterns may be identified according to the number of antennas. How to evade.
The method of claim 2,
The user terminal checks the information indicating the number of antennas used by the adjacent cell or RRH to transmit the CRS,
In the bitmap, two or more CRS patterns are matched to the same bit position, and the CRS pattern of the two or more CRS patterns can be identified according to the number of antennas identified by the user terminal. How to avoid signal collisions in your system.
The method of claim 1,
The user terminal operates in a JT (Joint Transmission) method,
The muting indication information indicates a part of the CRS pattern except the CRS pattern used by the base station, method for avoiding signal collision in a cooperative wireless communication system.
The method of claim 1,
The user terminal operates in a DCS (Dynamic Cell Selection) method,
And the muting indication information is information indicating a cell to which the user terminal is to be switched.
In order to avoid a collision with a reference signal transmitted adjacent to a user terminal that transmits and receives a signal with a base station that provides cooperative wireless communication,
Receiving muting indication information generated from the base station in consideration of a cell-specific reference signal (CRS) pattern of an adjacent cell or a radio remote head (RRH); And
Receiving a signal from the base station,
And the receiving signal is generated by muting a resource region indicated by the muting indication information.
The method of claim 8,
The muting indication information comprises a bitmap of 2 to 9 bits indicating the CRS pattern, the method of avoiding signal collision in a cooperative wireless communication system.
The method of claim 8,
Wherein the muting indication information is the same as a CRS pattern representing a resource used by the adjacent cell or RRH to transmit a CRS, or includes two or more CRS patterns.
The method of claim 9,
The muting indication information includes information indicating the number of antennas used by the adjacent cell or RRH to transmit CRS.
In the bitmap, two or more CRS patterns are matched to the same bit position, and the user terminal may identify one of the two or more CRS patterns according to the number of antennas. How to avoid signal collisions in your system.
The method of claim 9,
The user terminal checks the information indicating the number of antennas used by the adjacent cell or RRH to transmit the CRS,
In the bitmap, two or more CRS patterns are matched to the same bit position, and the CRS pattern of the two or more CRS patterns can be identified according to the number of antennas identified by the user terminal. How to avoid signal collisions in your system.
The method of claim 8,
The user terminal operates in a JT (Joint Transmission) method,
The muting indication information indicates a part of the CRS pattern except the CRS pattern used by the base station, method for avoiding signal collision in a cooperative wireless communication system.
The method of claim 8,
The user terminal operates in a DCS (Dynamic Cell Selection) method,
And the muting indication information is information indicating a cell to which the user terminal is to be switched.
In order to avoid collision with a reference signal transmitted adjacently at a base station that provides cooperative wireless communication,
A muting indication information generation unit generating muting indication information in consideration of a cell-specific reference signal (CRS) pattern of an adjacent cell or a radio remote head (RRH);
A transceiver for transmitting and receiving a signal to and from the user terminal and transmitting the muting indication information to the user terminal; And
And a control unit for controlling the transceiver to mute and transmit the signal to the user terminal by muting the resource region indicated by the muting indication information.
In order to avoid a collision with a reference signal transmitted adjacent to a user terminal that transmits and receives a signal with a base station that provides cooperative wireless communication,
A transceiver for transmitting and receiving a signal to and from the base station, and receiving muting indication information generated in consideration of a cell-specific reference signal (CRS) pattern of an adjacent cell or a radio remote head (RRH);
And a control unit for controlling the transceiver to receive a signal generated by muting a resource region indicated by the muting indication information from the base station.

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