KR101619105B1 - Method for Transmitting Uplink Demodulation Reference Signal, Terminal thereof, Method for processing Uplink Demodulation Reference Signal and Transmission/Reception point thereof - Google Patents

Abstract

The present invention relates to a method for transmitting an uplink demodulation reference signal, a method for processing the terminal, an uplink demodulation reference signal, and a transmission / reception point thereof.

Description

[0001] The present invention relates to a method for transmitting an uplink demodulation reference signal, a method for processing the uplink demodulation reference signal, and a method for processing the uplink demodulation reference signal,

The present invention relates to a method for transmitting an uplink demodulation reference signal, a method for processing the terminal, an uplink demodulation reference signal, and a transmission / reception point thereof.

In a coordinated multi-point transmission / reception system (CoMP system) in which two or more transmission / reception points cooperatively transmit signals, an uplink demodulation reference signal (DM-RS ) Transmission was required.

Also, DM-RS transmission is required for uplink transmission in a multi-user multi-input multi-output (MU-MIMO).

According to an aspect of the present invention, there is provided a method of transmitting an uplink demodulation reference signal of a terminal, the method comprising the steps of: transmitting a downlink demodulation reference signal to a terminal including a terminal-specific parameter indicating a cyclic shift hopping pattern from a first transmission / reception point of two or more different transmission / Receiving specific configuration information; Setting the cyclic shift hopping pattern to be the same for each slot of one subframe and the other terminal through an instruction of the parameter indicating the cyclic shift hopping pattern, disabling the sequence group hopping and the sequence hopping, Generating an uplink demodulation reference signal (DM-RS) by applying another orthogonal cover code (OCC); And transmitting the generated DM-RS to one of the first transmission / reception point and the second transmission / reception point different from the first transmission / reception point or the first transmission / reception point among the transmission / reception points.

According to another aspect of the present invention, there is provided a method comprising: transmitting terminal-specific configuration information including a terminal-specific parameter indicating a cyclic shift hopping pattern to at least one terminal belonging to a transmission / reception point; And setting the cyclic shift hopping pattern for each slot of one subframe to be the same for each of the terminals through the indication of the parameter indicating the cyclic shift hopping pattern, disabling the sequence group hopping and the sequence hopping, Receiving an uplink demodulation reference signal (DM-RS) generated by applying different orthogonal cover codes (OCCs) for each of the UEs from one of the UEs; And provides a demodulation reference signal processing method.

According to another aspect of the present invention, there is provided a terminal for transmitting an uplink demodulation reference signal in a wireless communication system, the terminal including a terminal-specific parameter indicating a cyclic shift hopping pattern from a first transmission / reception point of two or more different transmission / Specific configuration information including the terminal-specific configuration information; Setting a cyclic shift hopping pattern to be the same for each slot of one subframe and another terminal through an instruction of the parameter indicating the cyclic shift hopping pattern, disabling the sequence group hopping and the sequence hopping, A control unit for generating an uplink demodulation reference signal (DM-RS) by applying an orthogonal cover code (OCC) different from the other terminals belonging to the transmission / reception point; And a transmitter for transmitting the generated DM-RS to one of the first transmission / reception point or the second transmission / reception point different from the first transmission / reception point among the transmission / reception points.

According to another aspect of the present invention, in a wireless communication system, terminal-specific configuration information including a terminal-specific parameter indicating a cyclic shift hopping pattern is transmitted and received to a transmission / reception point for processing an uplink demodulation reference signal from a terminal To the at least one terminal to which the terminal belongs; The cyclic shift hopping pattern is set to be the same for every slot of one subframe for each of the terminals through the indication of the parameter indicating the cyclic shift hopping pattern, the sequence group hopping and the sequence hopping are disabled, A receiver for receiving an uplink demodulation reference signal (DM-RS) generated by applying different orthogonal cover codes (OCCs) for each of the UEs from one of the UEs; And a controller for controlling the transmitter and the receiver to process the uplink demodulation reference signal.

1 shows an example of a wireless communication system to which embodiments are applied.
2 is a conceptual diagram of uplink DM-RS transmission of an uplink CoMP according to an embodiment.
3 is a flowchart of an uplink demodulation reference signal transmission / reception method according to another embodiment.
4 is a diagram illustrating a process in which a UE generates an uplink DM-RS sequence in FIG.
5 is a block diagram of a UE generating an uplink DM-RS sequence in FIG.
6 is a conceptual diagram of groups of sequence group hopping.
7 and 8 are conceptual diagrams of uplink DM-RS transmission of uplink CoMP according to another embodiment.
9 is a diagram illustrating a configuration of a transmission / reception point according to another embodiment of the present invention.
10 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals 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.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a transmission / reception point. The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station (BS) or a cell, a Node-B, an evolved Node-B (eNB), a sector (Sector) ), A site, a base transceiver system (BTS), an access point, a relay node, a remote radio head (RRH), and a radio unit (RU).

That is, the base station or the cell in this specification is interpreted as a comprehensive meaning indicating a partial region or function covered by BSC (Base Station Controller) in CDMA, NodeB in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as a megacell, a macro cell, a microcell, a picocell, a femtocell and a relay node, a remote radio head (RRH), and a communication range of an RU (radio unit).

In this specification, a user terminal and a transmission / reception point are used in a generic sense as two transmitting and receiving subjects used to implement the technical or technical idea described in the present specification, and are not limited by a specific term or word. The user terminal and the transmission / reception point are used in a broad sense as two (uplink or downlink) transmission / reception subjects used to implement the technical or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes 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- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In a system such as LTE and LTE-A, the uplink and downlink are configured based on one carrier or carrier pair to form a standard. The uplink and downlink transmit control information through a control channel such as a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), and a Physical Uplink Control CHannel And a data channel such as a Physical Downlink Shared CHannel (PDSCH), a Physical Uplink Shared CHannel (PUSCH), and the like.

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself . Herein, the transmission / reception point means a transmission point for transmitting a signal or a reception point for receiving a signal or a transmission / reception point thereof.

1 shows an example of a wireless communication system to which embodiments are applied.

Referring to FIG. 1, a wireless communication system 100 to which embodiments are applied includes a coordinated multi-point transmission / reception system (CoMP system) in which two or more transmission / reception points cooperatively transmit signals, A coordinated multi-antenna transmission system, and a cooperative multi-cell communication system. CoMP system 100 may include at least two transmit and receive points 110 and 112 and terminals 120 and 122.

The transmission / reception point has a high transmission power, which is connected to a base station or a macro cell (hereinafter referred to as 'eNB') 110 and an eNB 110 through an optical cable or an optical fiber, Or at least one RRH 112 with the same number of RRs. The eNB 110 and the RRH 112 may have the same cell ID or different cell IDs.

Hereinafter, a downlink refers to a communication or communication path from the transmission / reception point 110 or 112 to the terminal 120, and an uplink refers to communication from the terminal 120 to the transmission / reception point 110 or 112 Or a communication path. In the downlink, the transmitter may be part of the transmission / reception point 110, 112, and the receiver may be part of the terminal 120, 122. In the uplink, the transmitter may be part of the terminal 120, and the receiver may be part of the transmission / reception point 110, 112.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH and PDSCH are transmitted and received'.

The eNB 110, which is one of the transmission / reception points 110 and 112, can perform downlink transmission to the UEs 120 and 122. [ The eNB 110 includes a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and downlink control information, such as scheduling, required for reception of a PDSCH, (Physical Downlink Control Channel (PDCCH)) for transmitting scheduling grant information for transmission in a physical uplink shared channel (PUSCH), for example. Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

The first terminal 120 (UE1) may transmit an uplink signal to the eNB 110. [ The second terminal 122 (UE2) may transmit the uplink signal to the RRH 112, which is one of the transmission and reception points 110 and 112. At this time, the first terminal 120 may transmit the uplink signal to the RRH 112 and the second terminal 122 may transmit the uplink signal to the eNB 110. The number of terminals may be two or more. In the following example, the number of UEs is two, one UE transmits an uplink signal to an eNB 110, and the other UE transmits an uplink signal to the RRH 112. [

Meanwhile, a demodulation reference signal (DMRS, DM-RS) and a sounding reference signal (SRS) are defined in the uplink in the LTE communication system, which is one of the current wireless communication schemes. (RS), and a cell specific reference signal (CRS), an MBSFN reference signal (MBSFN-RS) And a UE-specific reference signal.

That is, in a wireless communication system, a UE transmits an uplink demodulation signal (UL DMRS or UL DM-RS) for each slot in order to grasp channel information for demodulating a data channel in an uplink transmission . In the uplink DM-RS associated with the PUSCH (Physical Uplink Shared CHannel), a reference signal is transmitted for one symbol in each slot. In the case of the uplink DM-RS associated with the PUCCH (Physical Uplink Control CHannel) A reference signal is transmitted for a maximum of three symbols.

As a method for randomizing inter-cell interference between terminals belonging to different cells in an uplink, a sequence group hopping and a sequence hopping method are applied to a sequence used in an uplink DM-RS. Sequence group hopping is a method of hopping 30 sequence groups per slot irrespective of the number of resource blocks (RBs) assigned to the UE, and the corresponding configuration is set to RRC (RRC parameter " Group - hopping - enabled "). In the case of sequence hopping, if the number of RBs allocated to the UE is 6RB or more, the number of base sequences is 2 in the corresponding sequence group. In this case, two base sequences that can be allocated in the corresponding sequence group are hopped for each slot The configuration is set to RRC (RRC parameter " Sequence-hopping-enabled ").

At this time, a sub-frame within each slot sequence are mana used in one allocated uplink DM-RS has RRC configuration (configuration) sequence group hopping parameters are set from the (Group - hopping - enabled), the sequence hopping parameters (Sequence - hopping - enabled or disabling sequence and group - hopping ( Disable - sequence - group - hopping ) parameters.

Meanwhile, in order to achieve MU-MIMO pairing of UEs belonging to the same cell having different bandwidths, different orthogonal cover codes (OCC) may be applied between the DM-RSs of different UEs to distinguish the UEs. Also, it is possible to set disabling sequence group hopping by using a disabling sequence and sequence group hopping ( Disable - sequence - group - hopping ), which is a parameter set by a terminal-specific RRC when a terminal is classified by OCC.

In this case, the OCC (Orthogonal cover code) is used for multiplexing between layers in the uplink DM-RS allocated to two SC-FDMA symbols in one subframe, one for each slot, For example, a walsh code ({1 1}, {1 -1}) between different terminals.

2 is a conceptual diagram of DM-RS transmission of an uplink CoMP according to an embodiment.

Referring to FIG. 2, an area where the coverage of the eNB 110 and the coverage of the RRH 112 overlap can be set as an uplink virtual cell coverage, for example, a CoMP sector (CoMP sector) 114. At this time, the eNB 110 and the RRH 112 perform joint scheduling or joint processing to share information, data, scheduling, and the like with each other.

At this time, in order to perform MU-MIMO pairing and uplink CoMP operations of UEs belonging to different eNBs 110 having different bandwidths or belonging to different RRHs 112 or different antennas Directs the cyclic shift hopping of the first parameter, e.g., a virtual cell ID (VCID) and the DM-RS, which is a UE-specific parameter indicating the cell ID of the CoMP sector 114 described above

를, 송수신포인트들 중 적어도 하나가 설정할 수 있다. 본 명세서에서 가상 셀 아이디(Virtual Cell ID)를 지시한 UE-특정 파라메터를 VCID(Virtual cell ID)으로, DM-RS의 사이클릭 쉬프트 호핑을 지시하기 위한 단말-특정 파라메터를

로 예시적으로 지칭하나 본 발명은 이에 제한되지 않는다.
A second parameter, which is a terminal-specific parameter for

May be set by at least one of the transmitting and receiving points. In this specification, a UE-specific parameter indicating a virtual cell ID is referred to as a VCID (Virtual cell ID), and a UE-specific parameter for indicating a cyclic shift hopping of the DM-RS

, But the present invention is not limited thereto.

At least one of the transmission and reception points, for example eNB 110 to terminal 120 or eNB 112 to terminal 122 to transmit the terminal-specific configuration information (e.g., the above parameters) to PDCCH / ePDCCH, or it can be quasi-statically set via an upper layer, for example RRC, or preset with RRC, and indication of whether to use the setting via PDCCH / ePDCCH. Here, the ePDCCH refers to a control channel allocated to a data area, not a control domain of a subframe. In this specification, UE-specific configuration information means a configuration specific to a particular UE belonging to a cell rather than being commonly used by all UEs belonging to the cell, ). ≪ / RTI > The UE-specific configuration information includes various UE-specific parameters indicating characteristics to a particular UE belonging to the cell.

값의 적절한 값의 설정, 즉 서로 다른 셀에 속한 단말들의

값의 지시를 통해 슬롯마다 DM-RS의 사이클릭 쉬프트 호핑 패턴이 다르도록 설정되는 경우에는 단말들(120, 122)이 전송하는 DM-RS들간의 직교한 전송이 불가능하고 또한 기지국에서는 단말들이 전송하는 DM-RS들간의 구분이 불가능하게 된다. At this time, to the terminals 120 and 122 belonging to different cells,

Setting of an appropriate value of the value, i.e.,

If the cyclic shift hopping pattern of the DM-RS is set to be different for each slot through the indication of the value, orthogonal transmission between the DM-RSs transmitted by the UEs 120 and 122 is impossible, It is impossible to distinguish between the DM-RSs.

값의 적절한 값의 설정, 즉 서로 다른 셀에 속한 단말들의

값의 지시를 통해 슬롯마다 DM-RS의 사이클릭 쉬프트 호핑 패턴이 동일하도록 설정한다. In the present invention, to perform MU-MIMO pairing and uplink CoMP operation through orthogonal DM-RS transmission of UEs 120 and 122 belonging to different RRHs belonging to different cells or having the same bandwidth or different bandwidths To the terminals 120 and 122

Setting of an appropriate value of the value, i.e.,

The cyclic shift hopping pattern of the DM-RS is set to be the same for each slot through the indication of the value.

값의 지시를 통해 슬롯마다 DM-RS의 사이클릭 쉬프트 호핑 패턴이 동일하도록 설정한 경우 슬롯마다 바뀌는 시퀀스 그룹 호핑 및 시퀀스 호핑이 인에이블링되어 있는 경우 단말들(120, 122)이 전송하는 DM-RS들간의 직교한 전송은 불가능하게 된다. The terminals 120 and 122

When the cyclic shift hopping pattern of the DM-RS is set to be the same for each slot through the instruction of the value, when the sequence group hopping and the sequence hopping that are changed for each slot are enabled, the DM- The orthogonal transmission between the RSs becomes impossible.

 At least one of the sending and receiving points, eNB 110, to terminal 120, or eNB 112, may automatically dynamically or sequentially perform sequence group hopping and sequence hopping operations on PDCCH / ePDCCH Layer is set to be quasi-statically disabled through, for example, RRC, thereby ensuring orthogonality of DM-RS between terminals by OCC. This instructs the UEs 120 and 122 to use the UE-specific configuration information regardless of whether sequence group hopping and sequence hopping set in the RRC are set in the UEs 120 and 122.

If sequence group hopping and sequence hopping are disabled, or if a terminal-specific upper layer parameter, e.g., Disable - sequence - group- hopping , which is an RRC parameter, is enabled, the UEs 120 , ≪ / RTI > 122).

Therefore, when the DM-RS cyclic shift hopping pattern through the indication of the UE-specific parameter for instructing the cyclic shift hopping of the corresponding DM-RS is set to be the same, Or disabling sequence group hopping and sequence hopping operations to enable orthogonal DM-RS transmission between terminals belonging to different RRHs.

In other words, the present invention is a method for making the DM-RS orthogonal for multiplexing between different terminals in transmission of an uplink PUSCH channel in an uplink CoMP operation, in which a sequence group hopping and a sequence hopping A method and an apparatus for setting to disable implicitly.

3 is a flowchart of a method of transmitting and receiving an uplink demodulation reference signal according to another embodiment of the present invention.

Referring to FIGS. 2 and 3, the eNB 110, which is one of the transmission / reception points, transmits the UE-specific configuration information to the first terminal 120 and the second terminal 122 (S310). In step S310, the first terminal 120 and the second terminal 122 receive the UE-specific configuration information, respectively.

를 포함할 수 있다. The UE-specific configuration information includes UE-specific parameters that set UEs 120 and 122 belonging to different cells, eNB 110 and RRH 120, to be UE-specific. For example, the UE-specific configuration information may include a first parameter, e.g., a VCID (Virtual cell ID), and a DM-RS parameter, which are UE-specific parameters indicating a virtual cell ID (VCID) A second parameter which is a terminal-specific parameter for instructing the cyclic shift hopping of, for example,

. ≪ / RTI >

The eNB 110 dynamically transmits the UE-specific configuration information to the UEs 120 and 122 via the PDCCH / ePDCCH or quasi-statically sets the UE-specific configuration information in an upper layer, for example, RRC or RRC, And may indicate whether to use the setting via the PDCCH / ePDCCH.

The eNB 110 transmits disabling information indicating disabling of the sequence group hopping and the sequence hopping operation to the terminals 120 and 122 (S320). In step S320, the terminals 120 and 122 receive the disabling information. The above-described step S320 may be performed before or after step S310.

The eNB 110 may transmit the disabling information either dynamically via the PDCCH / ePDCCH or semi-statically via the PDCCH / ePDCCH over the upper layer, for example RRC, or semi-static As shown in FIG. For example, the disabling information may include terminal-specific RRC parameters, e.g., Disable - sequence - group - hopping .

It is not necessary to transmit Disable - sequence - group - hopping indicating disabling of sequence group hopping and sequence hopping when sequence group hopping and sequence hopping of UEs 120 and 122 are disabled in step S320, Terminals to the UE terminals 120 and 122 regardless of the sequence group hopping and sequence hopping setting whether to set to the RRC (120, 122) transmits a group -hopping-sequence - Disable to indicate the specific configuration information to be used do.

The first terminal 120 transmits the UE-specific configuration information received in step S310 and disabling information indicating disabling of the sequence group hopping and the sequence hopping operation received in step S320 from the eNB 110 to the DM -RS is generated (S330).

값의 지시를 통해 슬롯마다 DM-RS의 사이클릭 쉬프트 호핑 패턴이 동일하도록 설정하고 OCC 적용을 통해 직교한 DM-RS를 생성한다. In step S330, the first terminal 120 sets disabling of the sequence group hopping and the sequence hopping operation using the disabling information received in step S320 from the eNB 110, Of the received terminal-specific configuration information

The DM-RS sets the cyclic shift hopping pattern of the DM-RS to be the same for each slot and generates the orthogonal DM-RS through OCC application.

The second terminal 122 transmits the UE-specific configuration information received in step S310 and the disabling information indicating disabling of the sequence group hopping and the sequence hopping operation received in step S320 from the eNB 110 to the DM -RS is generated (S340). The above-described step S340 may be performed before or after step S330.

값의 지시를 통해 슬롯마다 DM-RS의 사이클릭 쉬프트 호핑 패턴이 동일하도록 설정하고 OCC 적용을 통해 직교한 DM-RS를 생성한다. In step S340, the second terminal 122 sets disabling of the sequence group hopping and the sequence hopping operation using the disabling information received in step S320 from the eNB 110, Of the received terminal-specific configuration information

The DM-RS sets the cyclic shift hopping pattern of the DM-RS to be the same for each slot and generates the orthogonal DM-RS through OCC application.

  In steps S330 and S340, the UEs 120 and 122 transmit the uplink PUSCH channel on the uplink CoMP operation using the disabling information and the UE-specific configuration information, DM-RS, which will be described in detail later with reference to FIG. 4 and FIG.

The first terminal 120 allocates the DM-RS generated in step S330 to the eNB 110 (S350).

The second terminal 120 allocates the DM-RS generated in step S340 to the RRH 112 and transmits it to the RRH 112 in step S360.

4 is a diagram illustrating a process in which a UE generates an uplink DM-RS sequence in FIG. 5 is a block diagram of a UE generating an uplink DM-RS sequence in FIG.

)로 구성되며 LTE 시스템의 경우 하나의 레이어(layer)와 LTE-A 시스템의 경우 최대 네개의 레이어들에 대해 DM-RS 시퀀스를 구성할 수 있다. The mapped DM-RS sequence includes a cyclic shift (CS) and a base sequence,

), And a DM-RS sequence can be configured for one layer in an LTE system and a maximum of four layers in an LTE-A system.

λ 및 베이스 시퀀스(

)에 의해 산출되는 예를 보여주고 있다.Equation (1) shows that the reference signal (RS) sequence is a cyclic shift (CS)

lambda and the base sequence (

). ≪ / RTI >

 [Equation 1]

는 시퀀스 그룹 넘버 u, 그룹 내의 베이스 시퀀스 넘버 v, 그리고 시퀀스의 길이인 n에 의하여 서로 다르게 생성된다. A base sequence based on the zadoff-chu sequence is generated for the uplink DM-RS sequence (S410). Base sequence

Is generated differently by the sequence group number u, the base sequence number v in the group, and the length n of the sequence.

6 is a conceptual diagram of groups of sequence group hopping.

As shown in FIG. 6, sequence group hopping hopes 30 sequence groups per slot irrespective of the number of RBs allocated to the UE.

Specifically, the sequence group number u in the slot n _s is determined by the following equation (2) by the group hopping pattern f _gh (ns) and the sequence shift pattern f _ss .

&Quot; (2) "

은 PUSCH에 대해 아래 수학식3에 의해 주어진다.Group hopping pattern

Is given by the following Equation 3 for PUSCH.

&Quot; (3) "

는 의사 랜덤 시퀀스(pseudo-random sequence)로 셀에 대해 특정한(cell-specific) 값이 될 수 있다. 의사 랜덤 시퀀스 생성기(pseudo-random sequence generator)는 각 무선 프레임에서

으로 시작된다. 도 3을 참조하여 전술한 바와 같이 단말들(120, 122)이 eNB(110)으로부터 단말-특정 파라메터인 VCID를 수신한 경우 단말(120, 122)의 의사 랜덤 시퀀스 생성기(pseudo-random sequence generator)는 단말-특정 파라메터인 VCID를 이용하여 각 무선 프레임에서

으로 시작된다.

May be a cell-specific value for a cell in a pseudo-random sequence. A pseudo-random sequence generator is used in each radio frame

≪ / RTI > Random sequence generator of the UEs 120 and 122 when the UEs 120 and 122 receive the UE-specific parameters VCID from the eNB 110 as described above with reference to FIG. Using the terminal-specific parameter VCID,

≪ / RTI >

에 의해 주어진다. 이때

는 상위 레이어에 의해 구성된다.The sequence shift pattern for PUSCH is

Lt; / RTI > At this time

Is constituted by an upper layer.

)인 참조신호들에 대해만 적용한다. 길이가 6RB들 미만(

)인 참조신호들에 대해 베이스 시퀀스 그룹 내 베이스 시퀀스 넘버 v=0으로 주어진다. Sequence hopping can be performed with a length of 6 RBs or more

) ≪ / RTI > reference signals. If the length is less than 6 RBs (

) ≪ / RTI > is given as the base sequence number v = 0 in the base sequence group.

)인 참조신호들에 대해 슬롯 n_s의 베이스 시퀀스 그룹 내 베이스 시퀀스 넘버 v는 아래 수학식4로 주어진다.If the length is 6 RBs or more (

), The base sequence number v in the base sequence group of slot n _s is given by Equation (4) below.

&Quot; (4) "

은 의사 랜덤 시퀀스(pseudo-random sequence)이다.

Is a pseudo-random sequence.

으로 시작된다. 도 3을 참조하여 전술한 바와 같이 단말들(120, 122)이 eNB(110)으로부터 단말-특정 파라메터인 VCID를 수신한 경우 단말(120, 122)의 의사 랜덤 시퀀스 생성기는 각 무선 프레임에서

으로 시작된다.The pseudo-random sequence generator generates

≪ / RTI > 3, when the UEs 120 and 122 receive the UE-specific parameters VCID from the eNB 110, the pseudo-random sequence generator of the UEs 120 and 122 transmits

≪ / RTI >

The sequence group hopping may be enabled or disabled by the cell-specific parameter Group- hopping-enabled provided by the upper layer. Generally, the sequence group hopping for PUSCH can be disabled for a specific UE through Disable - sequence - group - hopping in an upper layer parameter in a certain situation even though it is enabled on a cell basis.

The Sequence - hopping - enabled parameter provided by the upper layer determines whether or not sequence hopping is enabled . Sequence hopping for the PUSCH may be disabled for a particular UE via Disable - sequence - group - hopping in the upper layer parameter under certain circumstances, even though it is enabled on a cell basis.

값에 의해 결정된다.On the other hand, if sequence group hopping is enabled, the v value in sequence hopping is always set to zero, and if sequence group hopping is disabled and sequence hopping is enabled,

Lt; / RTI >

However, in this embodiment, regardless of whether sequence group hopping and sequence hopping are enabled or not, the terminals 120 and 122 perform a sequence group hopping and a sequence hopping operation using the disabling information received in step S320 shown in FIG. 3 Set to disable.

In other words, if the UEs 120 and 122 receive VCIDs, which are the UE-specific parameters, from the eNB 110 in step S310, the UEs 120 and 122 may be in the same uplink DM-RS Lt; / RTI >

λ 를 구하는 과정은 수학식 5와 같다.
On the other hand, in the slot n _s , a value for the cyclic shift

The process for obtaining? is as shown in Equation (5).

&Quot; (5) "

λ 의 값을 구하기 위해 n_{cs ,λ}는

,

, 그리고,

를 산출해야 한다.
remind

To find the value of λ, n _{cs , λ} is

,

, And,

.

는 표 1과 같이 상위 레이어에 의해 주어지는 사이클릭 쉬프트 파라메터의 값에 의해 결정된다. 따라서, 표 1과 같이

를 산출한다(S420).remind

Is determined by the value of the cyclic shift parameter given by the upper layer as shown in Table 1. Therefore, as shown in Table 1

(S420).

[Table 1]

The eNB 110 transmits a 3-bit cyclic shift parameter value to the UEs 120 and 122 through an uplink DCI format, for example, DCT format 0 or DCI format 4 (S430). This 3-bit value may be carried in the most recent specific DCI format, e.g., DCI Format 0 or DCI Format 4 CS (Cyclic Shift) field, as in the embodiment of Table 2.

를 산출한다(S440). By the cyclic shift in the transmitted cyclic shift field

(S440).

[Table 2]

는 수학식 2에 나타난 바와 같이 산출되며(S420), 유사 랜덤 시퀀스인 c(i)는 셀에 대해 특정한(cell-specific) 값이 될 수 있다. remind

Is calculated as shown in Equation 2 (S420), and the pseudo random sequence c (i) may be a cell-specific value for the cell.

값이 지시하는 것은

λ를 결정하기 위한 값으로서 전술한 수학식2에서의

값을 계산하는데 사용된다. 이

의 시작값(initialization value)으로서 셀 ID에 기반한 셀-특정한

수식에 셀 ID 대신 단말-특정한 파라메터인

를 사용하여

을 단말-특정하게 설정함으로 다른 셀에 속한 단말들(120, 122)이 슬롯마다 DM-RS의 사이클릭 쉬프트 호핑 패턴이 아래 수학식 6과 같이 동일하도록 설정할 수 있다.In step < RTI ID = 0.0 > S310, < / RTI >

What the value indicates

As a value for determining < RTI ID = 0.0 >#,< / RTI >

It is used to calculate the value. this

Cell-specific < RTI ID = 0.0 >

If the formula contains a terminal-specific parameter instead of a cell ID

use with

The UEs 120 and 122 belonging to different cells can set the cyclic shift hopping pattern of the DM-RS to be equal to each slot as shown in Equation (6) below.

&Quot; (6) "

λ, OCC를 계산한다(S450).

λ의 값을 구하기 위한 n_{cs , λ}에서 파라메터가 되는

과

는 각 기지국(셀 등) 및 슬롯 넘버(n_s) 에 따라 달라지지만, 동일한 기지국(셀 등) 및 슬롯 넘버(n_s)에서는 고정된 값을 가지므로, 실질적으로 n_{cs , λ}의 값을 다르게 하는 파라메터는

이다. 즉, 실질적으로 단말 별로 스케줄링하여 기지국 등을 통해 전송하게 되는 파라메터는

이며, 이 값에 따라 상향링크 DM-RS의 CS(Cyclic Shift) 값인 α가 다른 값을 가지게 된다. 이때 전술한 바와 같이 단말-특정한 파라메터인

를 사용하여

을 단말-특정하게 설정함으로 다른 셀에 속한 단말들(120, 122)이 슬롯마다 DM-RS의 사이클릭 쉬프트 호핑 패턴이 동일하도록 설정 할 수 있다. Based on the values calculated in steps S420 to S440 _, n _cs ,

?, and OCC are calculated (S450).

n _cs to find the value of _λ ,

and

(Cells, etc.) and the slot number n_s have fixed values, and therefore, the parameters that make the values of n _{cs and λ} different from each other are different from each other depending on the base station (cell) and the slot number n_s The

to be. That is, the parameters to be transmitted through the base station, etc.,

, And according to this value, the CS (Cyclic Shift) value of the uplink DM-RS has a different value. At this time, as described above, the terminal-specific parameter

use with

The UEs 120 and 122 belonging to different cells can set the cyclic shift hopping pattern of the DM-RS to be the same for each slot.

In order to further guarantee the orthogonality between layers in SU-MIMO and MU-MIMO, or in order to distinguish a plurality of terminals in MU-MIMO, OCC (Orthogonal Cover Code) can be used.

는

로 주어진다.Specifically, if the upper layer parameter Activate-DMRS-with OCC is not set, or if the temporary C-RNTI is used to transmit the most recent uplink-related DCI for the transport block associated with the corresponding PUSCH transmission,

The

.

는 PUSCH 전송과 연관된 트랜스포트 블록에 대한 가장 최근 상향링크 관련 DCI에 포함된 사이클릭 쉬프트 필드를 사용하는 전술한 표2에 의해 묵시적으로(implicit) 주어진다. 표 2는 상향링크-관련 DCI 포맷에서 사이클릭 쉬프트 필드를

및

으로 매칭한다.Otherwise, the orthogonal sequence

Is implicitly given by Table 2 above using the cyclic shift field included in the most recent uplink related DCI for the transport block associated with the PUSCH transmission. Table 2 shows the cyclic shift field in the uplink-related DCI format

And

.

를 "0", "6"을 지시하고 제2단말(122)에 두개의 레이어들(λ=0, λ=1)에 대해

를 "3", "9"로 지시한다. 한편 제1단말(120)에 두개의 레이어들(λ=0, λ=1)에 대해

=[1 1], [1 1]을 지시하고 제2단말(122)에 두개의 레이어들(λ=0, λ=1)에 대해

=[1 -1], [1 -1]을 지시할 수 있다. For example, in Table 2, the eNB 110 may indicate the value of the cyclic shift field to "000" to the first terminal 120 in the uplink-related DCI format. Meanwhile, the eNB 110 may indicate the value of the cyclic shift field to "010" to the second terminal 122 in the uplink-related DCI format. Therefore, as shown in Table 2, in the case of Rank 2, the first terminal 120 is divided into two layers (? = 0,? = 1)

0 " and " 6 "to the second terminal 122,

Quot; 3 ","9" On the other hand, if the first terminal 120 has two layers (? = 0,? = 1)

= [1 1], [1 1], and instructs the second terminal 122 to transmit two layers (λ = 0, λ = 1)

= [1 -1], [1 -1].

를 사용하여

을 단말-특정하게 설정함으로 두개의 레이어들(λ=0, λ=1)에 대한

과 OCC값이 다르지만 동일한 사이클릭 쉬프트 호핑 패턴을 지시하므로 단말들(120, 122)에 대해 직교한 DM-RS들을 생성할 수 있다. At this time, when the eNB 110 transmits a terminal-specific parameter to the first terminal 120 and the second terminal 122

use with

(Λ = 0, λ = 1) by setting the terminal-specific

And orthogonal DM-RSs with respect to the UEs 120 and 122 can be generated because they indicate the same cyclic shift hopping pattern with different OCC values.

λ (사이클릭 쉬프트 값, CS), OCC에서 수학식 1에 의해 DM-RS 시퀀스를 생성한다(S460). DM-RS 시퀀스를 생성하는 S460단계는 도 5의 OFDM 변조기(OFDM modulator, 510)에서 수행된다.Then, the base sequence of S410 and the base sequence of S450

A DM-RS sequence is generated according to Equation (1) at? (cyclic shift value, CS), OCC (S460). The step S460 of generating the DM-RS sequence is performed in the OFDM modulator 510 of FIG.

The DM-RS sequence generated by Equations (1) and (2) is mapped to a corresponding symbol of each slot of a subframe (S470). The step S470 is performed through the resource element mapper 520 in FIG.

In case of the DM-RS associated with the PUSCH, the symbol is allocated to the fourth symbol of the seventh symbol of each slot when a normal CP (Cyclic Prefix) is used, and when the extended CP is used, .

Upon completion of the mapping, an SC-FDMA symbol is generated from a resource element (RE) to which the DM-RS sequence is mapped through an SC FDMA generator (not shown in FIG. 5) To the base station (S480).

Step S480 corresponds to step S350 and step S360 of FIG. 3 for each terminal. In other words, in step S480, the first terminal 120 allocates the generated DM-RS to the radio resource and transmits it to the eNB 110, and the second terminal 120 allocates the generated DM-RS to the radio resource, 112).

The method and apparatus for generating the uplink DM-RS sequence in the uplink CoMP environment shown in FIG. 2 and transmitting the uplink DM-RS to the terminals belonging to different cells have been described. Hereinafter, a method and apparatus for generating an uplink DM-DS sequence in the uplink CoMP environment shown in FIGS. 7 and 8 and transmitting the uplink DM-RS to terminals belonging to different cells will be described.

7 and 8 are conceptual diagrams of uplink DM-RS transmission of the uplink CoMP.

FIG. 7 shows an uplink CoMP scenario in which the eNB 110 and the RRH 112 use the same cell ID, and FIG. 8 illustrates an uplink CoMP scenario in which the eNB 110 and the RRH 112 use different cell IDs. Respectively. At this time, the eNB 110 and the RRH 112 perform joint scheduling or joint processing to share information, data, scheduling, and the like with each other.

The method and apparatus for generating the uplink DM-DS sequence in the uplink CoMP environment shown in FIGS. 7 and 8 and transmitting the uplink DM-RS to the terminals belonging to different cells will be described with reference to FIGS. 3 to 6 And transmits the uplink DM-RS sequence to the UEs belonging to different cells.

However, since the eNB 110 and the RRH 112 use the same Cell ID in the uplink CoMP environment shown in FIG. 7, a UE-specific parameter indicating a virtual cell ID in step S310 of FIG. 3 Does not include a first parameter, for example, a virtual cell ID (VCID). Since the eNB 110 and the RRH 112 use the same cell ID, the base sequence of the uplink DM-RS of the UEs 120 and 122 is the same.

3, since the eNB 110 and the RRH 112 use different cell IDs in the uplink CoMP environment shown in FIG. 8, the UE-specific parameters indicating the virtual cell ID in step S310 of FIG. E.g., a virtual cell ID (VCID). Since the eNB 110 and the RRH 112 use different cell IDs, the base sequence of the uplink DM-RS of the UEs 120 and 122 is different.

를 포함하고 S320단계에서 송수신포인트들 중 적어도 하나, 예를 들어 eNB(110)가 단말들(120)에게 혹은 eNB(112)가 단말(122)에게 자동적으로 시퀀스 그룹 호핑 및 시퀀스 호핑 동작을 PDCCH/ePDCCH를 통해 동적으로 또는 상위 레이어, 예를 들어 RRC를 통해서 준정적으로 디스에이블링하도록 설정함으로써 OCC에 의한 단말들간의 DM-RS의 직교성(orthogonality)을 보장할 수 있다.In step S310, regardless of the uplink CoMP environment shown in FIGS. 7 and 8, a second parameter, which is a terminal-specific parameter for instructing the cyclic shift hopping of the DM-RS with the UE-specific configuration information,

The eNB 110 or the eNB 112 automatically transmits a sequence group hopping and sequence hopping operation to the PDCCH / UE 122 in step S320, it is possible to guarantee the orthogonality of the DM-RS between the UEs by the OCC by dynamically setting it to disable dynamically via the ePDCCH or quasi-static via the upper layer, for example RRC.

9 is a diagram illustrating a configuration of a transmission / reception point according to another embodiment of the present invention.

9, the transmission / reception point 1000 according to another embodiment includes a control unit 1010, a transmission unit 1020, and a reception unit 1030. The transmission / reception point 1000 may be the transmission / reception points described above, for example, the eNB 110 and / or the RRH 112, and may be the base station or the cell described with reference to FIG.

The controller 1010 controls the overall operation of the transmission / reception point according to the CoMP operation required to perform the above-described present invention. The control unit 1010 controls the transmitting unit 1020 and the receiving unit 1030 to process the uplink demodulation reference signal.

The transmitting unit 1020 and the receiving unit 1030 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

The transmitter 1020 transmits the terminal-specific configuration information including the terminal-specific parameter indicating the cyclic shift hopping pattern to at least one terminal belonging to the transmission / reception point.

The transmitter 1020 transmits disabling information indicating disabling of the sequence group hopping and the sequence hopping to at least one terminal belonging to the transmission / reception point.

If the cyclic shift hopping pattern is set to be the same for each slot of one subframe through an instruction of a parameter indicating a cyclic shift hopping pattern and the sequence group hopping and the sequence hopping are disabled When disabling sequence group hopping, which is a UE-specific upper layer parameter, is enabled, orthogonal uplink demodulation reference signals (OCCs) generated by applying different orthogonal cover codes (OCCs) to UEs belonging to different transmission / uplink Demodulation Reference Signal (DM-RS) from one of the at least two terminals belonging to two or more different transmission and reception points.

When the coverage of two or more transmission / reception points is overlapped with the uplink virtual cell coverage, the UE-specific configuration information includes UE-specific configuration information indicating a virtual cell ID indicating a cell ID of uplink virtual cell coverage, Additional parameters are included.

10 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

10, a user terminal 1100 according to another embodiment includes a receiving unit 1110, a control unit 1120, and a transmitting unit 1130. The user terminal 1100 may be, but is not limited to, the terminals 120 and 122 described with reference to FIGS.

The receiving unit 1110 receives downlink control information, data, and a message from the transmission / reception point through the corresponding channel.

The receiving unit 1110 receives terminal-specific configuration information including a terminal-specific parameter indicating a cyclic shift hopping pattern from at least one transmission / reception point of two or more different transmission / reception points.

The receiving unit 1110 also receives disabling information indicating disabling of the sequence group hopping and the sequence hopping from at least one transmitting / receiving point of two or more transmitting / receiving points.

Also, the controller 1120 controls overall operation of the base station according to the CoMP operation required to perform the above-described present invention.

The control unit 1120 sets the cyclic shift hopping pattern to be the same for each slot of one subframe through the indication of the parameter indicating the cyclic shift hopping pattern and the sequence group hopping and the sequence hopping are disabled , Or if disabling sequence group hopping, which is a terminal-specific upper layer parameter, is enabled, different orthogonal cover codes (OCCs) are applied to each of the terminals belonging to different transmission / reception points and orthogonal uplink demodulation reference Signal (uplink Demodulation Reference Signal, DM-RS).

The control unit 1120 receives disabling information indicating disabling of the sequence group hopping and the sequence hopping from at least one transmission / reception point of two or more transmission / reception points.

The OFDM modulator 510, the resource element mapper 520, and the SC FDMA generator (not shown) described with reference to FIG. 5 may be included in the controller 1120.

The transmission unit 1130 transmits downlink control information, data, and a message to the transmission / reception point through the corresponding channel.

The transmission unit 1130 transmits the generated DM-RSs to at least one transmission / reception point of the two or more transmission / reception points.

When the uplink CoMP operation is performed according to the above embodiment, the DM-RSs between the UEs belonging to different cells and different RRHs having the same bandwidth or different bandwidths are orthogonalized or near-orthogonal And the throughput according to the MU-MIMO pairing and the uplink CoMP operation can be improved.

In addition, according to the above-described embodiment, interference between different cells or different RRHs that may occur during the uplink CoMP operation is reduced, thereby increasing the data rate of the UE and reducing the battery consumption of the UE according to the retransmission.

The description of the content specification relating to the standard specification mentioned in the above-mentioned embodiment is omitted for the sake of simplicity and constitutes a part of this specification. Therefore, it is to be understood that the content of some of the contents related to the above standard is added to or included in the scope of the present invention.

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 scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (14)

A method for transmitting an uplink demodulation reference signal of a UE,
Receiving terminal-specific configuration information including a terminal-specific parameter indicating a cyclic shift hopping pattern from a first transmission / reception point of two or more different transmission / reception points;
Receiving disabling information indicating disabling of sequence group hopping and sequence hopping from the first transmission / reception point;
Disabling the sequence group hopping and the sequence hopping using the disabling information and generating a cyclic shift hopping pattern for each slot of one subframe and another terminal through an indication of the parameter indicating the cyclic shift hopping pattern, Generating an uplink demodulation reference signal (DM-RS) by setting the hopping pattern to be the same and applying an orthogonal cover code (OCC) different from other terminals; And
And transmitting the generated DM-RS to one of the first transmission / reception point or the second transmission / reception point different from the first transmission / reception point among the transmission / reception points,
Wherein the sequence of the uplink demodulation reference signal comprises:
Wherein the base station is generated based on the cyclic shift hopping pattern set to be the same, the base sequence to which the sequence hopping and the sequence hopping are not applied, and the orthogonal cover code.
delete The method according to claim 1,
Wherein the step of receiving the disabling information comprises receiving the disabling information through the PDCCH / e PDCCH or an upper layer. The method according to claim 1,
Specific configuration information may further include a terminal-specific parameter indicating a virtual cell ID indicating a cell ID of the uplink virtual cell coverage when the uplink virtual cell coverage is set. And transmitting the uplink demodulation reference signal to the terminal. The method according to claim 1,
Wherein the terminal is allocated the same bandwidth or different bandwidth as the other terminals. 5. The method of claim 4,
Specific configuration information is received dynamically via a PDCCH / ePDCCH, received via an upper layer or set in advance through an upper layer, and whether the terminal-specific configuration information is used for the setting is received via a PDCCH / ePDCCH. Link demodulation reference signal transmission method. Specific configuration information including a terminal-specific parameter indicating a cyclic shift hopping pattern to at least one terminal belonging to a transmission / reception point;
Transmitting disabling information indicating disabling of sequence group hopping and sequence hopping to the terminals; And
Wherein the sequence group hopping and the sequence hopping are disabled using the disabling information, and cyclic shift hopping is performed for each slot of one subframe for each of the terminals through an indication of the parameter indicating the cyclic shift hopping pattern, And a uplink demodulation reference signal (DM-RS) generated by applying different orthogonal cover codes (OCCs) to the UEs from one of the UEs ≪ / RTI >
Wherein the sequence of the uplink demodulation reference signal comprises:
A base station sequence to which the sequence hopping is applied, a base sequence to which the sequence hopping is not applied, and an orthogonal cover code, the uplink pilot signal being generated based on the cyclic shift hopping pattern.
delete 8. The method of claim 7,
Specific configuration information further includes a terminal-specific parameter indicating a virtual cell ID indicating a cell ID of the uplink virtual cell coverage when the uplink virtual cell coverage is set to ' Of the uplink demodulation reference signal of the transmitting and receiving point. 10. The method of claim 9,
Specific configuration information is transmitted dynamically via a PDCCH / ePDCCH, transmitted through an upper layer or preset in an upper layer, and whether to use the configuration is transmitted through a PDCCH / ePDCCH. Uplink demodulation reference signal processing method. A terminal for transmitting an uplink demodulation reference signal in a wireless communication system,
A receiving unit for receiving terminal-specific configuration information including a terminal-specific parameter indicating a cyclic shift hopping pattern from a first transmission / reception point of two or more different transmission / reception points;
And setting the cyclic shift hopping pattern to be the same for each slot of one subframe through the indication of the parameter indicating the cyclic shift hopping pattern, and setting the cyclic shift hopping pattern to be different from the other terminals belonging to the second transmission / (OCC) to generate an uplink demodulation reference signal (DM-RS); And
And a transmitter for transmitting the generated DM-RS to one of the first transmission / reception point or the second transmission / reception point different from the first transmission / reception point among the transmission / reception points,
Wherein the receiving unit receives disabling information indicating disabling of the sequence group hopping and the sequence hopping from the first transmission / reception point,
Wherein the control unit disables the sequence group hopping and the sequence hopping using the disabling information,
Wherein the sequence of the uplink demodulation reference signal is generated based on the cyclic shift hopping pattern set to be the same, the base sequence to which the sequence hopping and the sequence hopping are not applied, and the orthogonal cover code. . 12. The method of claim 11,
If the coverage of the two or more transmission / reception points is overlapped with the uplink virtual cell coverage, the UE-specific configuration information indicates a virtual cell ID indicating a cell ID of the uplink virtual cell coverage And further comprising a terminal-specific parameter. A transmission / reception point for processing an uplink demodulation reference signal from a terminal in a wireless communication system,
A transmission unit for transmitting terminal-specific configuration information including a terminal-specific parameter indicating a cyclic shift hopping pattern to at least one terminal belonging to a transmission / reception point;
The cyclic shift hopping pattern is set to be the same for every slot of one subframe for each of the terminals through the indication of the parameter indicating the cyclic shift hopping pattern, the sequence group hopping and the sequence hopping are disabled, A receiver for receiving an uplink demodulation reference signal (DM-RS) generated by applying different orthogonal cover codes (OCCs) for each of the UEs from one of the UEs; And
And a controller for controlling the transmitter and the receiver to process the uplink demodulation reference signal,
Wherein the transmitter transmits disabling information indicating disabling of the sequence group hopping and the sequence hopping to the terminals,
Wherein the sequence of the uplink demodulation reference signal comprises:
A cyclic shift hopping pattern set to be the same, a base sequence to which the sequence hopping and the sequence hopping are not applied, and a transmission and reception point generated based on the orthogonal cover code. 14. The method of claim 13,
If the coverage of the two or more transmission / reception points is overlapped with the uplink virtual cell coverage, the UE-specific configuration information indicates a virtual cell ID indicating a cell ID of the uplink virtual cell coverage And a terminal-specific parameter.

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