KR102281357B1 - Method for Transmitting and Receiving Aperiodic Sounding Referecne Signal, Terminal and Base Station thereof - Google Patents

Abstract

The present invention provides a step of receiving two or more parameters for determining a time-frequency resource in which an aperiodic sounding reference signal is transmitted through higher layer signaling, and a parameter set including some of the parameters. Receiving an index to be selected through at least one of PDCCH or EPDCCH, receiving a signal triggering an aperiodic sounding reference signal through at least one of PDCCH or EPDCCH, and a parameter received through higher layer signaling and PDCCH or EPDCCH Transmitting an aperiodic sounding reference signal by frequency hopping to a frequency domain of a part of the entire frequency band of interest through a time-frequency resource according to a parameter included in a parameter set received through at least one of A method for transmitting and receiving a sounding reference signal, a terminal thereof, and a base station thereof are provided.

Description

Transmitting method and receiving method of aperiodic sounding reference signal, the terminal, and the base station TECHNICAL FIELD

The present invention relates to an uplink cooperative communication method, a terminal thereof, and a transmission/reception point thereof. The present invention also relates to a method for transmitting and receiving an aperiodic sounding reference signal, a terminal thereof, and a base station thereof.

A coordinated communication or a coordinated multi-point transmission/reception system (CoMP system) in which two or more transmission/reception points cooperate to transmit a signal is being developed.

In particular, uplink CoMP in which the terminal transmits uplink to another reception point rather than uplink transmission to a serving cell is being developed.

In addition, various discussions on a method of transmitting and receiving an aperiodic sounding reference signal are continuing.

According to the present invention, a method for transmitting and receiving an aperiodic sounding reference signal capable of covering an entire frequency band by transmitting a narrowband aperiodic sounding reference signal while hopping in a frequency domain, a terminal thereof, and a base station thereof are provided. .

In one aspect, the present invention provides a step of receiving two or more parameters for determining a time-frequency resource through which an aperiodic sounding reference signal is transmitted through higher layer signaling, including some of the parameters Receiving an index designating a parameter set through at least one of PDCCH or EPDCCH, receiving a signal triggering an aperiodic sounding reference signal through at least one of PDCCH or EPDCCH, and a parameter received through higher layer signaling and transmitting an aperiodic sounding reference signal by frequency hopping to a frequency domain of a part of the entire frequency band of interest through a time-frequency resource according to a parameter included in a parameter set received through at least one of PDCCH or EPDCCH. It provides a method of transmitting an aperiodic sounding reference signal of a terminal comprising:

In this case, in the step of transmitting the aperiodic sounding reference signal by frequency hopping to a partial frequency domain of the entire frequency band, one aperiodic sounding reference signal may be transmitted to the partial frequency domain.

In addition, in the step of transmitting the aperiodic sounding reference signal by frequency hopping to a frequency domain of a part of the entire frequency band, the aperiodic sounding reference signal can be transmitted to a base station different from the base station that has independently received parameters in PUSCH and PUCCH. .

In another aspect, the present invention receives two or more parameters for determining a time-frequency resource through which an aperiodic sounding reference signal is transmitted through higher layer signaling, and a parameter including some of the parameters A receiver that receives an index designating a set through at least one of PDCCH or EPDCCH, and receives a signal triggering an aperiodic sounding reference signal through at least one of PDCCH or EPDCCH, and the parameter received through the higher layer signaling Including a transmitter for frequency hopping to a frequency domain of a part of the entire frequency band of interest through a time-frequency resource according to a parameter included in a parameter set received through at least one of PDCCH or EPDCCH to transmit an aperiodic sounding reference signal It provides a terminal that

In this case, when the transmitter transmits the aperiodic sounding reference signal by frequency hopping to a part of the frequency domain of the entire frequency band, the transmitter may transmit the aperiodic sounding reference signal once to the part of the frequency domain.

In addition, the aperiodic sounding reference signal may be transmitted to a base station different from the base station that has independently received parameters in PUSCH and PUCCH.

In another aspect, the present invention includes a step of transmitting two or more parameters for determining a time-frequency resource in which an aperiodic sounding reference signal is transmitted through higher layer signaling, including some of the parameters Transmitting an index specifying a parameter set to be used through at least one of PDCCH or EPDCCH, transmitting a signal triggering an aperiodic sounding reference signal through at least one of PDCCH or EPDCCH, and higher layer signaling received through Receiving an aperiodic sounding reference signal by frequency hopping to a frequency domain of a part of the entire frequency band of interest through a time-frequency resource according to a parameter and a parameter included in a parameter set received through at least one of PDCCH or EPDCCH It provides a method of receiving an aperiodic sounding reference signal of a base station, including a.

In another aspect, the present invention transmits two or more parameters for determining a time-frequency resource in which an aperiodic sounding reference signal is transmitted through higher layer signaling, including some of the parameters A transmitter that transmits an index designating a parameter set through at least one of PDCCH or EPDCCH and transmits a signal triggering an aperiodic sounding reference signal through at least one of PDCCH or EPDCCH and a parameter received through higher layer signaling Including a receiver for frequency hopping to a frequency domain of a part of the entire frequency band of interest through a time-frequency resource according to a parameter included in a parameter set received through at least one of PDCCH or EPDCCH to receive an aperiodic sounding reference signal It provides a base station that

According to the present invention, a method for transmitting and receiving an aperiodic sounding reference signal, the terminal, and the base station have the effect of covering the entire frequency band by transmitting the narrowband aperiodic sounding reference signal while hopping in the frequency domain. there is.

1 shows an example of a wireless communication system to which embodiments are applied.
2 illustrates a general uplink/downlink data transmission method in a CoMP scenario in which transmission/reception points use different cell IDs and a heterogeneous network implementation situation.
3 illustrates a method for transmitting uplink/downlink data in an implementation situation of a CoMP scenario in which transmission/reception points use the same cell ID.
FIG. 4 illustrates an uplink/downlink data transmission method according to embodiments in a CoMP implementation situation in which the transmission/reception points of FIG. 2 use different cell IDs (Cell ID #1, Cell ID #2).
5 illustrates a method of transmitting uplink/downlink data according to embodiments in a CoMP implementation situation in which the transmission/reception points of FIG. 3 use the same cell ID (Cell ID #0).
6 is a flowchart of an SRS transmission method according to an embodiment.
7 is a block diagram of a terminal transmitting an uplink SRS according to another embodiment of the present invention.
8 shows the positions of symbols of the SRS allocated by the terminal.
9 shows an SRS without frequency hopping and an SRS with frequency hopping.
10 illustrates an aperiodic SRS without frequency hopping and an aperiodic SRS with frequency hopping according to another embodiment.
11 is a flowchart of a method for controlling uplink power according to another embodiment.
12 is a diagram illustrating a configuration of a transmission/reception point according to another embodiment.
13 is a diagram showing the configuration of a user terminal according to another embodiment.

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 components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice and packet data. A wireless communication system includes a user equipment (UE) and a transmission/reception point. A user terminal in the present specification is a comprehensive concept meaning a terminal in wireless communication, and as well as UE (User Equipment) in WCDMA, LTE, HSPA, etc., MS (Mobile Station) in GSM, User Terminal (UT), SS (Subscriber Station), a wireless device (wireless device), etc. should be interpreted as a concept that includes all.

A transmission/reception point generally refers to a point that communicates with a user terminal, a base station (BS) or a cell, a Node-B, an evolved Node-B (eNB), and a sector. ), site, base transceiver system (BTS), access point, relay node, remote radio head (RRH), radio unit (RU), antenna, and the like.

That is, in the present specification, a transmission/reception point or a base station or a cell is a comprehensive range or function that indicates a partial area or function covered by a Base Station Controller (BSC) in CDMA, NodeB in WCDMA, eNB or sector (site) in LTE, etc. It should be interpreted as meaning, and it means that it encompasses various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH (Remote Radio Head), and RU (Radio Unit) communication range. am.

In the present specification, the user terminal and the transmission/reception point are two transmission/reception entities used to implement the technology or technical idea described in this specification, and are used in an inclusive sense and are not limited by specifically designated terms or words. The user terminal and the transmission/reception point are used in an inclusive sense as two (uplink or downlink) transmission/reception subjects used to implement the technology or technical idea described in the present invention, and are not limited by specific terms or words. Here, the uplink (Uplink, UL, or uplink) refers to a method of transmitting and receiving data by the user terminal to the base station, and the downlink (Downlink, DL, or downlink) is transmitting and receiving data to the user terminal by the base station. means how to

There is no limitation on the multiple access method applied to the wireless communication system. 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-TDMA, OFDM-CDMA can be used An 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, and HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB. 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.

For uplink transmission and downlink transmission, a time division duplex (TDD) scheme transmitted using different times may be used, or a frequency division duplex (FDD) scheme transmitted using different frequencies may be used.

In addition, in systems such as LTE and LTE-A, standards are configured by configuring uplink and downlink based on one carrier or carrier pair. 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 (PUCCH). and a data channel such as a Physical Downlink Shared CHannel (PDSCH) and a Physical Uplink Shared CHannel (PUSCH) to transmit data.

In the present specification, a cell is a component carrier having a coverage of a signal transmitted from a transmission/reception point or a coverage of a signal transmitted from a transmission/reception point, and the transmission/reception point itself. can In the present specification, the transmission/reception point means a transmission point for transmitting a signal or a reception point for receiving a signal, and a combination thereof (transmission/reception point).

wireless communication system

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 is a coordinated multi-point transmission/reception system (CoMP system) or cooperation in which two or more transmission/reception points cooperate to transmit a signal. It may be a coordinated multi-antenna transmission system or a cooperative multi-cell communication system. The CoMP system 100 may include at least two transmission/reception points 110 and 112 and terminals 120 and 122 .

The transmission/reception point is connected to a base station or a macro cell (macro cell or macro node, 110, hereinafter referred to as 'eNB') and the eNB 110 by an optical cable or optical fiber and is controlled by wire, has high transmission power or within a macro cell area. It may be at least one pico cell (pico cell 112, hereinafter referred to as 'RRH') having low transmission power. The eNB 110 and the RRH 112 may have the same cell ID or different cell IDs.

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

Hereinafter, a situation in which signals are transmitted and received through channels such as PUCCH, PUSCH, PDCCH and PDSCH may be expressed in the form of 'transmitting and receiving PUCCH, PUSCH, PDCCH and PDSCH'.

One of the transmission/reception points 110 and 112 , the eNB 110 , may perform downlink transmission to the terminals 120 and 122 . The eNB 110 is a physical downlink shared channel (PDSCH), which is a main physical channel for unicast transmission, and downlink control information such as scheduling required for receiving the PDSCH and uplink data channel. A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in (eg, a physical uplink shared channel (PUSCH)) may be transmitted. Hereinafter, the transmission and reception of a signal through each channel will be described in the form of transmission and reception of the corresponding channel.

The first terminal 120 (UE1) may transmit an uplink signal to the eNB 110 . The second terminal 122 , UE2 may transmit an uplink signal to the RRH 112 , which is one of the transmission/reception points 110 and 112 . In this case, the first terminal 120 may transmit an uplink signal to the RRH 112 , and the second terminal 122 may transmit an uplink signal to the eNB 110 . Also, the number of terminals may be two or more. However, in the embodiment below, the number of terminals is two, and one terminal transmits an uplink signal to the eNB 110 and the other terminal transmits an uplink signal to the RRH 112 .

On the other hand, in the LTE communication system, which is one of the current wireless communication methods, a demodulation reference signal (DM-RS, DM-RS) and a sounding reference signal (SRS) are defined in the uplink, Three reference signals (RS) are defined in the downlink, a cell-specific reference signal (CRS), and an MBSFN reference signal (Multicast/Broadcast over Single Frequency Network Reference Signal; MBSFN- RS) and a UE-specific reference signal.

In a wireless communication system, a terminal transmits an uplink demodulation signal (UL DM-RS or UL DM-RS) for every slot in order to identify channel information for demodulation of a data channel during uplink transmission. . In the case of an uplink DM-RS associated with a Physical Uplink Shared CHannel (PUSCH), a reference signal is transmitted for one symbol in every slot, and in the case of an uplink DM-RS associated with a Physical Uplink Control CHannel (PUCCH), every slot Each reference signal is transmitted for up to three symbols.

2 illustrates a general uplink/downlink data transmission method in a CoMP scenario in which transmission/reception points use different cell IDs and a heterogeneous network implementation situation. 3 illustrates a method for transmitting uplink/downlink data in an implementation situation of a CoMP scenario in which transmission/reception points use the same cell ID.

Referring to FIG. 2 , the wireless communication system 100 to which the embodiments are applied is a CoMP system in which the eNB 110 and the RRH 112 have different cell IDs, respectively, and a CoMP scenario and a heterogeneous network. can Referring to FIG. 3 , a wireless communication system 100 to which embodiments are applied is a CoMP scenario in which an eNB 110 and RRHs 112a, 112b, 112c, 112d, 112e, 112f have the same cell ID. It can be a system.

In the case of DM-RS for PUSCH data demodulation in the CoMP system shown in FIGS. 2 and 3 , parameters for generating a reference signal transmitted by the terminal in the wireless communication system 100, for example, a sequence group index, a sequence The terminal receives the index, cyclic shift index, and orthogonal cover code (OCC) index information from the eNB 110 as a transmission/reception point to which the corresponding terminal belongs, for example, a serving transmission/reception point. At this time, when a plurality of terminals are shown in the drawing, the drawing numbers of the terminals are divided into 120a, 120b, 120c, etc., and when only one terminal is shown, the drawing numbers of the terminals are displayed as 120.

In the case of uplink SRS, parameters for generation of SRS transmitted by the UE from any transmission/reception point or cell to the UE in the wireless communication system 100, for example, the cell-specific SRS band of the SRS (cell specific SRS) bandwidth), transmission comb (transmission comb) (frequency positioning assigned with 2 subcarrier spacing intervals, e.g. 0 (even subcarriers) or 1 (odd subcarriers)), UE-specific SRS band (UE- specific SRS bandwidth), hopping related configuration parameters, frequency domain position, periodicity, subframe configuration (specifies which subframe to transmit SRS in), antenna configuration (of the antenna transmitting SRS) Designate the number, the number of antenna ports), base sequence index (the SRS sequence index for generating the corresponding SRS is determined according to the sequence group number u used in PUCCH and the sequence number v determined according to the sequence hopping configuration), cyclic shift The corresponding transmission/reception point transmits an index (a cyclic shift index as a reference signal used when generating the SRS) as an RRC parameter to the terminal 120a, and the terminal 120a receives the information and transmits the uplink SRS.

Additionally, aperiodic SRS is defined along with periodic SRS. The aperiodic SRS is also similar to the periodic SRS, and various parameters used for generating the aperiodic SRS are parameters for generating the aperiodic SRS transmitted by the terminal as used in the wireless communication system 100, for example, Terminal-specific SRS band of aperiodic SRS, transmission comb, frequency domain location, period, subframe configuration, antenna configuration, base sequence index, cyclic shift index, etc. are transmitted as RRC parameters to the terminal 120a by an arbitrary transmission/reception point do.

In order to additionally transmit the aperiodic SRS, any transmission/reception point dynamically triggers the transmission of the aperiodic SRS through the PDCCH to the terminal 120a, and the terminal 120a receives the triggering by the PDCCH and RRC parameters to uplink. Aperiodic SRS is transmitted.

According to the above-described uplink/downlink data transmission method, the reference signal transmitted by the terminal belonging to a certain transmission/reception point is capable of receiving the reference signal transmitted by the terminal 120a only at the corresponding transmission/reception point, and other arbitrary transmission and reception Since the point cannot know information for generating a reference signal transmitted by the corresponding terminal 120a, the corresponding reference signal cannot be received. Here, the reception does not mean that the reference signal is received due to interference, but that the reference signal is received as a desired signal according to the purpose of the signal transmitted by the terminal.

In addition, the present invention relates to an uplink channel (eg, PUSCH, PUCCH, SRS, uplink-related RS) transmitted by a terminal belonging to an arbitrary transmission/reception point to the arbitrary transmission/reception point and a transmission/reception point other than the corresponding transmission/reception point. Provided are a method and an apparatus for classifying an uplink channel for transmission. Classification of the corresponding channels may be a distinction for the same channel type (ie, between SRSs, between PUSCHs, between PUCCHs, and between related RSs) and for different channel types (ie, between SRS and PUSCHs, between PUCCHs). and between PUSCHs and between PUCCHs and SRSs).

FIG. 4 illustrates an uplink/downlink data transmission method according to embodiments in a CoMP implementation situation in which the transmission/reception points of FIG. 2 use different cell IDs (Cell ID #1, Cell ID #2).

Referring to FIG. 4 , a downlink control channel (PDCCH) and a data channel (PDSCH) are received from a transmission/reception point to which the corresponding terminal 120a belongs, for example, an eNB 110 (hereinafter the same), and uplink channels, for example, For example, at least one of PUSCH, PUCCH, uplink-related RS (uplink DM-RS), and SRS to the corresponding terminal 120a, a transmission/reception point with good geometry and channel quality, for example, RRH (112, hereinafter the same) can be sent to

5 illustrates a method of transmitting uplink/downlink data according to embodiments in a CoMP implementation situation in which the transmission/reception points of FIG. 3 use the same cell ID (Cell ID #0).

Referring to FIG. 5 , a downlink control channel (PDCCH) and a data channel (PDSCH) are received from a transmission/reception point to which the corresponding terminal 120a belongs, for example, the eNB 110, and uplink channels, for example, PUSCH, At least one of PUCCH, uplink-related RS (uplink DM-RS), and SRS may be transmitted to a corresponding terminal to a transmission/reception point having good geometry and channel quality, for example, a specific RRH 112 .

Example 1 : SRS sequence produce

6 is a flowchart of an SRS transmission method according to an embodiment.

Referring to FIG. 6 , one of the transmission/reception points, the eNB 110 , transmits UE-specific configuration information for uplink transmission to the UE 120 belonging to the eNB 110 ( S610 ). In step S1410, the terminal 120 receives terminal-specific configuration information for uplink transmission.

The terminal-specific configuration information for uplink transmission includes terminal-specific parameters for terminal-specifically setting the terminal 120 belonging to the eNB 110 for uplink transmission.

Specifically, a reference signal (PUSCH DM-RS) associated with PUSCH and PUSCH, a reference signal associated with PUCCH and PUCCH (PUCCH DM-RS) are each independent, and a sequence independent of the PUCCH and PUSCH sequence is generated and the SRS sequence is generated and these Uplink transmission can be performed to the transmission/reception point independently of .

)를 사용하고 PUCCH 및 PUCCH과 연계된 참조신호(PUCCH DM-RS)의 시퀀스 생성시 셀 ID와 독립된 가상의 셀 ID(

)를 사용할 수 있다. 상향링크 전송을 위해 단말-특정하게 설정하는 단말-특정 파라메터는 PUSCH 및 PUSCH과 연계된 참조신호(PUSCH DM-RS), PUCCH 및 PUCCH과 연계된 참조신호(PUCCH DM-RS)의 시퀀스 생성시 셀 ID와 독립된 가상의 셀 ID들(

,

)을 포함할 수 있다. 반대로 기존과 동일하게 PUSCH 및 PUSCH과 연계된 참조신호(PUSCH DM-RS) 및 PUCCH 및 PUCCH과 연계된 참조신호(PUCCH DM-RS)의 시퀀스 생성시 물리적 셀 ID(physical cell ID, PCID= N _ID ^cell)를 사용할 수도 있다. 이때 PUCCH 및 PUCCH과 연계된 참조신호(PUCCH DM-RS)의 시퀀스 생성시 셀 ID와 독립된 가상의 셀 ID(

)은 단말-특정 PUSCH DM-RS의 구성의 파라메터들과 독립적이다. 한편 PUSCH 및 PUSCH과 연계된 참조신호(PUSCH DM-RS), PUCCH 및 PUCCH과 연계된 참조신호(PUCCH DM-RS)의 시퀀스 생성시 셀 ID와 독립된 가상의 셀 ID들(

,

)의 범위는 0 내지 503이다. For example, when generating a sequence of a PUSCH and a reference signal (PUSCH DM-RS) associated with PUSCH, a virtual cell ID independent of a physical cell ID (PCID) (

) and a virtual cell ID independent of the cell ID when generating the sequence of the reference signal (PUCCH DM-RS) associated with PUCCH and PUCCH (

) can be used. The UE-specific parameters set in the UE-specific manner for uplink transmission are a reference signal (PUSCH DM-RS) associated with PUSCH and PUSCH, and a reference signal (PUCCH DM-RS) associated with PUCCH and PUCCH when the sequence is generated. Virtual cell IDs independent of ID (

,

) may be included. Conversely, when the sequence of the reference signal (PUSCH DM-RS) associated with PUSCH and PUSCH and the reference signal (PUCCH DM-RS) associated with PUCCH and PUCCH is generated in the same way as before, physical cell ID (physical cell ID, PCID = N _ID) ^cell ) can also be used. In this case, when generating a sequence of PUCCH and a reference signal (PUCCH DM-RS) associated with PUCCH, a virtual cell ID independent of the cell ID (

) is independent of the parameters of the configuration of the UE-specific PUSCH DM-RS. Meanwhile, when generating a sequence of a reference signal (PUSCH DM-RS) associated with PUSCH and PUSCH, and a reference signal (PUCCH DM-RS) associated with PUCCH and PUCCH, virtual cell IDs independent of the cell ID (

,

) ranges from 0 to 503.

)은 PUSCH과 연계된 참조신호(PUSCH DM-RS) 뿐만 아니라 PUSCH의 시퀀스 생성시 사용될 수 있다. PUCCH 및 PUCCH과 연계된 참조신호(PUCCH DM-RS)에 대한 가상의 셀 ID(

)은 PCSCH과 연계된 참조신호(PUCCH DM-RS) 뿐만 아니라 PUCCH의 시퀀스 생성시 사용될 수 있다.A virtual cell ID for a reference signal (PUSCH DM-RS) associated with PUSCH and PUSCH in the same way (

) may be used when generating a PUSCH sequence as well as a PUSCH-associated reference signal (PUSCH DM-RS). Virtual cell ID for PUCCH and reference signal (PUCCH DM-RS) associated with PUCCH (

) may be used when generating the sequence of the PUCCH as well as the reference signal (PUCCH DM-RS) associated with the PCSCH.

) 로 구현된 단말의 PDCCH-트리거된 동적 A/N 자원은 FDD의 경우에 HARQ A/N 자원인덱스는 n₍₁₎PUCCH = nCCE + N⁽¹⁾PUCCH_CoMP 에 따라 결정될 수 있다. 이때 N⁽¹⁾PUCCH_CoMP는 상위계층에 의해 단말-특정하게 구현될 수 있다. 다시 말해 HARQ A/N 자원인덱스 n₍₁₎PUCCH는 도 4 및 도 5에 도시한 상향링크 CoMP를 고려하여 하향링크 제어 할당의 첫번째 CCE(Control Channel Element)의 인덱스와 함께 상위계층에 의해 단말-특정하게 구현되는 N⁽¹⁾PUCCH_CoMP에 의해 결정될 수 있다.On the other hand, virtual cell ID for PUCCH (

In the case of FDD, the PDCCH-triggered dynamic A/N resource of the UE implemented as ) HARQ A/N resource index may be determined according _{to n (1)} PUCCH = nCCE + N ^{(1) PUCCH_CoMP.} In this case, N ⁽¹⁾ PUCCH_CoMP may be implemented in a UE-specific manner by a higher layer. In other words, the HARQ A/N resource index n ₍₁₎ PUCCH is the first CCE (Control Channel Element) index of the downlink control assignment in consideration of the uplink CoMP shown in FIGS. 4 and 5. By the upper layer, the terminal- It may be determined by specifically implemented N ^{(1) PUCCH_CoMP.}

A UE-specific parameter set in a UE-specific manner for uplink transmission is two RRC parameter sets ({VCID ^SRS (n), D _ss SRS (n) independent of PUSCH and/or PUCCH) to generate a UE-specific SRS sequence. )}, n=0,1).

)를 그대로 사용할 수도 있다.{VCID ^SRS (0), D _ss ^SRS (0)} for uplink-related DCI formats, for example, trigger type 0 (periodic SRS) and trigger type 1 (aperiodic SRS) by DCI format 0/4 can be implemented. {VCID ^SRS (1), D _ss ^SRS (1)} is trigger type 1 (by DCI format 1A/2B/2C for TDD and DCI format 1A for FDD) aperiodic SRS). As will be described later, for group hopping, VCID ^SRS (n) is used instead of cell ID (N _ID ^cell ), and for sequence hopping, VCID ^SRS (n) and D _ss ^SRS (n) are used for N _ID ^cell and D _ss may be used instead. In this case ^{, the range of VCID SRS} (n) may be 0 to 503, and D _ss ^SRS (n) may be 0 to 29. Meanwhile, for SRS group hopping and sequence hopping, two RRC parameter sets ({VCID ^SRS (n), D _ss SRS(n)}, n=0,1) are not used and the cell ID (

) can also be used as it is.

)라고 기재한다. 특히 SRS의 셀 아이디는 VCID^SRS(n)n=0,1이거나 셀 ID(

)일 수 있다.For convenience of description below, the cell ID of the uplink reference signals (PUCCH DM-RS, PUSCH DM-RS, SRS) is referred to as the reference signal ID (

) is written. In particular, the cell ID of the ^SRS is VCID SRS (n)n=0,1 or the cell ID (

) can be

The eNB 110 dynamically transmits terminal-specific configuration information including terminal-specific parameters for uplink transmission to the terminal 120 through PDCCH/ePDCCH or semi-statically configured through a higher layer, for example, RRC. Alternatively, it may be set in advance with RRC, and whether to use the setting may be indicated through PDCCH/ePDCCH.

The terminal 120 uses virtual cell IDs independent of the cell ID when generating sequences of PUSCH and PUSCH-associated reference signals (PUSCH DM-RS), PUCCH and PUCCH-associated reference signals (PUCCH DM-RS), respectively. A reference signal (PUSCH DM-RS) associated with PUSCH and PUSCH and a reference signal (PUCCH DM-RS) associated with PUCCH and PUCCH may be generated.

(1) base sequence produce

)를 생성한다. 이 베이스 시퀀스는 시퀀스 그룹 넘버 u, 그룹 내의 베이스 시퀀스 넘버 v에 의하여 서로 다르게 생성된다. 시퀀스 그룹 넘버 u, 그룹 내의 베이스 시퀀스 넘버 v를 결정하는데 셀 아이디(

) 대신에 PUCCH DM-RS의 가상의 셀 ID(

)를 사용할 수 있다. 동일하게 PUSCH DM-RS의 베이스 시퀀스 생성시 시퀀스 그룹 넘버 u, 그룹 내의 베이스 시퀀스 넘버 v를 결정하는데 셀 아이디(

) 대신에 PUSCH DM-RS의 가상의 셀 ID(

)를 사용할 수 있다.For example, the base sequence of PUCCH DM-RS (base sequence,

) is created. This base sequence is generated differently by the sequence group number u and the base sequence number v in the group. To determine the sequence group number u, the base sequence number v within the group, the cell ID (

) instead of the virtual cell ID of PUCCH DM-RS (

) can be used. Similarly, when generating the base sequence of the PUSCH DM-RS, the cell ID (

) instead of the virtual cell ID of PUSCH DM-RS (

) can be used.

가 상위계층에 의해 구현되지 않았으면 셀 아이디(

)를 사용하여 PUCCH DM-RS의 베이스 시퀀스 생성시 시퀀스 그룹 넘버 u, 그룹 내의 베이스 시퀀스 넘버 v를 결정할 수 있다. 반면에

가 상위계층에 의해 구현되었으면 가상 셀 아이디(

)를 사용하여 PUCCH DM-RS의 베이스 시퀀스 생성시 시퀀스 그룹 넘버 u, 그룹 내의 베이스 시퀀스 넘버 v를 결정할 수 있다.Specifically, when transmitting a reference signal (PUCCH DM-RS) associated with PUCCH

is not implemented by the upper layer, the cell ID (

) can be used to determine the sequence group number u and the base sequence number v in the group when generating the base sequence of the PUCCH DM-RS. on the other side

is implemented by the upper layer, the virtual cell ID (

) can be used to determine the sequence group number u and the base sequence number v in the group when generating the base sequence of the PUCCH DM-RS.

가 상위계층에 의해 구현되지 않았거나 대응하는 PUSCH 전송과 연계된 전송 블록에 대한 가장 최근의 상향링크 관련 DCI를 전송하기 위하여 임시 C-RNTI(temporary C-RNTI)가 사용되었으면 셀 아이디(

)를 사용하여 PUSCH DM-RS의 베이스 시퀀스 생성시 시퀀스 그룹 넘버 u, 그룹 내의 베이스 시퀀스 넘버 v를 결정할 수 있다. 반면에 그렇지 않으면 가상 셀 아이디(

)를 사용하여 PUSCH DM-RS의 베이스 시퀀스 생성시 시퀀스 그룹 넘버 u, 그룹 내의 베이스 시퀀스 넘버 v를 결정할 수 있다.When transmitting a reference signal (PUSCH DM-RS) associated with PUSCH in the same way

If is not implemented by a higher layer or a temporary C-RNTI (temporary C-RNTI) is used to transmit the most recent uplink-related DCI for the transport block associated with the corresponding PUSCH transmission, the cell ID (

) can be used to determine the sequence group number u and the base sequence number v in the group when generating the base sequence of the PUSCH DM-RS. On the other hand, if not, the virtual cell ID (

) can be used to determine the sequence group number u and the base sequence number v in the group when generating the base sequence of the PUSCH DM-RS.

로 설정된 경우에

로부터

로 변경할 수도 있으니 복잡도를 낮추기 위해 변경을 허용하지 않을 수도 있다.

로 설정된 경우에

로부터

로 변경할 수도 있으니 복잡도를 낮추기 위해 변경을 허용하지 않을 수도 있다.Meanwhile

if set to

from

can be changed to , so the change may not be allowed to reduce complexity.

if set to

from

can be changed to , so the change may not be allowed to reduce complexity.

Meanwhile, when transmitting a PUCCH-associated reference signal (PUCCH DM-RS), a common virtual cell ID may be used for all PUCCH formats, or an independent virtual cell ID may be used for each PUCCH format or some of the PUCCH formats.

The terminal 120 allocates the PUCCH DM-RS generated by the base sequence, the cyclic shift, and the orthogonal code (or orthogonal cover code) to the allocated radio resource to transmit/receive indicated by the virtual cell ID of the PUCCH DM-RS. The point, for example, is transmitted to the RRH 112, and the generated PUSCHH DM-RS is allocated to the allocated radio resource to the transmission/reception point indicated by the virtual cell ID of the PUSCHH DM-RS, for example, the RRH 112. It transmits (S620).

In addition, the terminal 120 transmits the PUCCH in the same frequency band as the band allocated for the PUCCH DM-RS and transmits the PUSCH in the same frequency band as the band allocated for the PUSCH DM-RS (S630). Among the transmission/reception points, only the transmission/reception point capable of receiving the PUCCH DM-RS receives the PUCCH using the received PUCCH DM-RS, and only the transmission/reception point capable of receiving the PUSCH DM-RS receives the received PUSCH DM-RS. It can be used to receive PUSCH.

^{The UE 120 uses UE-specific configuration information including two RRC parameter sets ({VCID SRS} (n), D _ss SRS(n)}, n=0,1) independent of PUSCH and/or PUCCH. An SRS is generated (S640). The process of generating the SRS in step S640 will be described in detail below.

(2) SRS sequence produce

)를 사이클릭 쉬프트(Cyclic Shift, CS)하여 SRS 전송을 위해 사용되는 자원 블록을 기반으로 하는 길이(

=사용되는 RB 개수 X RB 내의 서브캐리어 수(보통 12)/2)를 가지고 생성된다.
The SRS sequence is a base sequence (base sequence) based on the Zadoff-Chu sequence as shown in Equations 1 and 2

) by cyclic shift (Cyclic Shift, CS) to the length based on the resource block used for SRS transmission (

= the number of RBs used X the number of subcarriers in the RB (usually 12)/2).

[Equation 1]

[Equation 2]

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

In the sequence group hopping, 30 sequence groups are hopping for each slot regardless of the number of RBs allocated to the UE.

Specifically, the sequence group number u in the _{slot n s} is determined by Equation 3 below by the _{group hopping pattern f gh} ( n _s ) and the sequence shift pattern f _{ss .}

[Equation 3]

을 가질 수도 있고 다른 시퀀스 그룹 호핑 패턴

을 가질 수도 있다. 한편, PUCCH와 PUSCH, SRS는 다른 시퀀스 쉬프트 패턴

을 가질 수 있다.
PUCCH, PUSCH, and SRS have the same sequence group hopping pattern

may have different sequence group hopping patterns

may have On the other hand, PUCCH, PUSCH, and SRS have different sequence shift patterns

can have

은 PUSCH와 PUCCH, SRS에 대해 아래 수학식 4에 의해 주어진다.group hopping pattern

is given by Equation 4 below for PUSCH, PUCCH, and SRS.

[Equation 4]

는 의사 랜덤 시퀀스(pseudo-random sequence)로 단말들(120)이 eNB(110)로부터 참조신호 아이디(

)를 수신한 경우 단말-특정 파라메터인

를 이용하여 각 무선 프레임에서

으로 초기화된다.

is a pseudo-random sequence, and the UEs 120 receive the reference signal ID (

) is received, the terminal-specific parameter

in each radio frame using

is initialized to

의 정의는 PUCCH와 PUSCH, SRS 사이에 다를 수 있다. SRS에 대한 시퀀스 쉬프트 패턴

은

으로 주어진다. sequence shift pattern

The definition of may be different between PUCCH, PUSCH, and SRS. Sequence shift pattern for SRS

silver

is given as

)인 참조신호들에 대해만 적용한다. 길이가 6RB들 미만(

)인 참조신호들에 대해 베이스 시퀀스 그룹 내 베이스 시퀀스 넘버 v=0으로 주어진다. Sequence hopping is longer than 6 RBs (

) is applied only to reference signals. less than 6 RBs in length (

) 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 수학식 5로 주어진다.
more than 6 RBs in length (

), the base sequence number v in the base sequence group of _{slot n s is given by Equation 5 below.}

[Equation 5]

은 의사 랜덤 시퀀스(pseudo-random sequence)이로, 각 무선 프레임에서

으로 초기화된다. 이때

는 상위계층에 의해 구성된다.

is a pseudo-random sequence, where in each radio frame

is initialized to At this time

is constituted by the upper layer.

는 수학식 6에 의해 각 단말 및 안테나 포트마다 서로 다르게 생성될 수 있다.cyclic shift value

can be generated differently for each terminal and antenna port according to Equation (6).

[Equation 6]

은 각 단말에 대하여 0 내지 7{0,1,2,3,4,5,6,7}의 총 8가지 값이 상위계층 시그널링(예를 들면, RRC)으로 전송되고, 각 안테나 포트에 대한 사이클릭 쉬프트 값은 수학식 6에서 볼 수 있는 바와 같이 전송된

값에 기초하여 정해진다. 수학식 6에서

는 안테나 포트 번호 인덱스이고,

는 SRS 전송 안테나 개수에 해당한다.Used to calculate the cyclic shift value

A total of 8 values of 0 to 7 {0,1,2,3,4,5,6,7} for each terminal are transmitted through higher layer signaling (eg, RRC), and for each antenna port The cyclic shift value is transmitted as shown in Equation (6).

It is determined based on the value. in Equation 6

is the antenna port number index,

corresponds to the number of SRS transmit antennas.

(사이클릭 쉬프트 값, CS)에서 수학식 1에 의해 SRS 시퀀스를 생성한다. In step S640, the base sequence of Equation 2 and Equation 6

(Cyclic shift value, CS) to generate an SRS sequence by Equation (1).

7 is a block diagram of a terminal transmitting an uplink SRS according to another embodiment of the present invention.

이 지시하는 송수신포인트, 예를 들어 RRH(112)에 전송한다(S650).Step S640 of generating the SRS sequence is performed by the OFDM modulator 710 of FIG. 7 . The terminal 120 allocates the SRS generated in step S640 to radio resources and

The indicated transmission/reception point, for example, is transmitted to the RRH 112 (S650).

In step S650, the SRS sequence generated by Equation 1 is mapped to the corresponding symbol of the subframe. Step S650 is performed through a resource element mapper 720 of FIG. 7 .

(3) SRS resource allocation and SRS configuration

8 shows the positions of symbols of the SRS allocated by the terminal. 9 shows an SRS without frequency hopping and an SRS with frequency hopping.

As shown in FIG. 8, the SRS is transmitted in the last symbol of a subframe. SRS transmission in the frequency domain should cover the frequency band of interest for frequency domain scheduling. As shown in (a) of FIG. 9, SRS transmission that is wide enough to estimate the channel quality for the entire frequency band of interest can be performed with a single SRS transmission. Meanwhile, as shown in FIG. 9B , by transmitting the narrowband SRS while hopping in the frequency domain, these SRS transmissions may be combined to cover the entire frequency band of interest.

As described above, when the mapping of the SRS to the resource element is completed, an SC-FDMA symbol is generated through an SC FDMA generator (not shown in FIG. 7) and the SRS signal is transmitted to the transmission/reception point.

A specific subframe in which the SRS is transmitted may be set to be periodic or aperiodic.

For example, a cell-specific SRS transmission defined as in Table 1 (Frequency Division Duplex, FDD) or Table 2 (Time Division Duplex, TDD) below. Among the possible subframes, as shown in FIG. 9 , the SRS may be periodically transmitted in a subframe having a specific period and an offset for each UE. This SRS may be referred to as a periodic SRS or a trigger type 0 SRS.

Alternatively, the SRS may be transmitted in a specific subframe configured aperiodically. This SRS may be referred to as an aperiodic SRS or a trigger type 1 SRS.

[Table 1]

[Table 2]

Tables 1 and 2 represent cell-specific SRS transmittable subframes defined in FDD (frame structure type 1) and TDD (frame structure type 2), respectively, in terms of period (T _SFC ) and offset (Δ _SFC ), and , the total number of possible cases is 16, which may be transmitted by 4-bit higher layer signaling (eg, RRC signaling). For example, in Table 1, if the srs-SubframeConfig value is 7 (0111), the period (T _SFC ) is 5 and the offset (Δ _SFC ) is {0, 1}, which is the first and SRS is transmitted in the second subframe.

The periodic SRS means an SRS that is periodically transmitted in the corresponding subframe with a specific period and offset for each UE among the above-described cell-specific SRS transmittable subframes.

The following Table 3 (FDD) and Table 4 (TDD) are tables showing a specific period and offset of a periodic SRS defined for each UE.

[Table 3]

[표 4]

[Table 4]

Tables 3 and 4 express a subframe in which a periodic SRS specific to a UE is transmitted as defined in FDD and TDD, respectively, with a period (T _SRS ) and an offset (T _offset ), and the total number of possible cases is 1024. This may be transmitted by 10-bit higher layer signaling (eg, RRC signaling). For example, in Table 3, if the I _SRS value is 3, the period (T _SRS ) is 5 and the offset (T _offset ) is 1, which is a periodic SRS for the UE in the second subframe with a period of 5 subframe units. will be transmitted

In addition, information on a resource block (RB) through which the SRS is transmitted may be signaled. First, the cell-specific total number of used resource blocks is signaled (in this case, the used resource blocks are specific resource blocks corresponding to the signaled number among the resource blocks corresponding to the total system bandwidth (bandwidth, BW). Example For example, if the system bandwidth is 50 resource blocks and the number of signaled resource blocks is 48, 48 resource blocks are used among all 50 resource blocks), which is used for each terminal among the cell-specifically used resource blocks. The number and location of resource blocks are signaled.

For example, Table 5 is a table used when the system bandwidth is 40 to 60 resource blocks.

A different table may be defined according to each system bandwidth. The total number of cell-specific resource blocks used may be transmitted as a parameter value called _{C SRS.} The number of resource blocks used for each UE among the cell-specific resource blocks may be defined by a parameter called _{B SRS.} For example, in Table 5, if C _SRS is 1 and B _SRS is 2, the number of cell-specific resource blocks used for the entire SRS transmission (m _{SRS ,0} ) is 48, among which resource blocks used for a specific terminal. The number of (m _{SRS ,2} ) is 8. _{Separately, a parameter n RRC} may be defined to express the location of a resource block used for each terminal. These parameters (C _SRS , B _SRS , n _RRC ) may be transmitted through higher layer signaling (eg, RRC).

[Table 5]

In addition, information on the subcarrier to which the SRS is allocated may be signaled. _{The transmission comb(k TC} ) value, which is information on the subcarrier to which the SRS is allocated, is 0 or 1, and the SRS sequence is substantially mapped with respect to the aforementioned SRS transmission subframe and the SRS transmission resource block, and the transmitted subcarrier is every even number It indicates whether it is an even subcarrier or every odd subcarrier. This may also be transmitted through higher layer signaling (eg, RRC signaling) for each UE.

및 안테나 포트의 개수가 RRC 시그널링과 같은 상위계층 시그널링을 통해 전송단으로부터 단말로 전달될 수 있다. 이를 정리하면, 다음의 표 6과 같다.
In summary, in order for the UE to transmit periodic SRS or trigger type 0 SRS, srs-SubframeConfig, a parameter for determining a subframe in which SRS is transmitted, I _{SRS , and C SRS as} a parameter for determining a resource block in which SRS is transmitted , B _SRS , n _{RRC , k TC} , which is a parameter for determining a subcarrier to which SRS is allocated, and a parameter for determining the cyclic shift of SRS

and the number of antenna ports may be transmitted from the transmitter to the terminal through higher layer signaling such as RRC signaling. To summarize, Table 6 below.

[Table 6]

On the other hand, among the cell-specific SRS transmittable subframes determined in Table 1 or Table 2, SRS may be transmitted in a specific subframe in which aperiodic is set, and this may be called aperiodic SRS or trigger type 1 SRS. .

In this case, the SRS has a specific period and offset defined for each UE as in the following Table 7 (FDD) or Table 8 (TDD) among the cell-specific SRS transmittable subframes set in Table 1 or Table 2 It is periodically transmitted in a specific corresponding subframe. Here, aperiodic transmission means that several configurable cases are designated in advance and SRS transmission is triggered through dynamic signaling such as DCI whenever necessary. As described above, in the case of periodic (trigger type 0) SRS, various signaling information for SRS transmission (eg, information on SRS transmission subframes, information on SRS transmission resource blocks, SRS allocation subcarriers for Information, information on a cyclic shift value used when generating an SRS sequence, information on the number of SRS transmission antennas, etc.) is directly transmitted through higher layer signaling (RRC signaling), in the case of aperiodic (trigger type 1) SRS, For some of the signaling information for SRS transmission, the value is not directly transmitted, but only a few cases are designated as a parameter set through higher layer signaling (RRC signaling), and this parameter only when SRS transmission is required. Only a value indicating a set is transmitted through dynamic signaling such as DCI.

[Table 7]

[Table 8]

, 및 안테나 포트 개수를 포함할 수 있다. 한편, 파라미터 srs-SubframeConfig 및 C_SRS는 상술한 파라미터 셋에 포함되지 않을 수 있다. 이를 정리하면 다음의 표 9와 같다.In the case of aperiodic SRS or trigger type 1 SRS, parameters included in the parameter set include I _{SRS , which is a parameter used to determine an SRS transmission subframe, B SRS} , which is a parameter used to determine an SRS transmission resource block, and n _{RRC. , k TC} , which is a parameter used to determine the subcarrier to which the SRS is allocated, is a parameter used to determine the cyclic shift of the SRS

, and the number of antenna ports. Meanwhile, the parameters srs-SubframeConfig and C _SRS may not be included in the above-described parameter set. This is summarized in Table 9 below.

[Table 9]

In the case of DCI format 0, a signal triggering the aperiodic SRS is 1 bit, and a value transmitted through it may be as shown in Table 10 below. In the case of DCI format 4, a signal for triggering the aperiodic SRS is 2 bits, and a value transmitted through it may be as shown in Table 11 below.

[Table 10]

[Table 11]

For example, in the case of DCI format 4, if the value of the SRS request field is '00', aperiodic SRS or Type 1 SRS is not transmitted, and if the value of the SRS request field is '01', '10' or '11' Aperiodic SRS or Type 1 SRS is transmitted according to one of parameter sets configured through higher layer signaling (RRC signaling).

As shown in FIG. 4 in the CoMP cooperating set, the SRS configurations of all receiving points having different cell IDs are notified to the terminals in which uplink CoMP is implemented through higher layer signaling. may need

In the simultaneous transmission of PUSCH and SRS defined in Rel-8/9/10, rate-matching should be performed on the last symbol of the PUSCH. If the SRS configuration between different RPs is not the same, all SRSs from the standpoint of one UE The UE may rate matching around all SRSs, or only around a subset of SRSs. Meanwhile, additional static/quasi-static/dynamic signaling may be additionally performed by higher layer signaling for the corresponding UE, for example, RRC signaling or PDCCH/ePDCCH signaling.

Example 2 : aperiodic SRS frequency hopping of Frequency Hopping of one slot aperiodic SRS )

A specific subframe in which the SRS is transmitted may be set to be periodic or aperiodic.

, 및 안테나 포트의 개수가 RRC 시그널링과 같은 상위계층 시그널링을 통해 전송단으로부터 단말로 전달될 수 있다. As described above, in order for the UE to transmit periodic SRS or trigger type 0 SRS, srs-SubframeConfig, which is a parameter for determining a subframe in which SRS is transmitted, I _SRS , and C which is a parameter for determining a resource block in which SRS is transmitted _SRS , B _SRS , n _{RRC , k TC} , a parameter for determining a subcarrier to which SRS is allocated, and a parameter for determining a cyclic shift of SRS

, and the number of antenna ports may be transmitted from the transmitter to the terminal through higher layer signaling such as RRC signaling.

On the other hand, among the cell-specific SRS transmittable subframes determined in Table 1 or Table 2, SRS may be transmitted in a specific subframe in which aperiodic is set, and this may be called aperiodic SRS or trigger type 1 SRS. .

In this case, the SRS has a specific period and offset defined for each UE as shown in Table 7 (FDD) or Table 8 (TDD) below among the cell-specific SRS transmittable subframes set in Table 1 or Table 2 It is periodically transmitted in a specific corresponding subframe. Here, aperiodic transmission means that several configurable cases are designated in advance and SRS transmission is triggered through dynamic signaling such as DCI whenever necessary.

, 및 안테나 포트 개수를 포함할 수 있다. 한편, 파라미터 srs-SubframeConfig 및 C_SRS는 상술한 파라미터 셋에 포함되지 않을 수 있다. In the case of aperiodic SRS or trigger type 1 SRS, parameters included in the parameter set include I _{SRS , which is a parameter used to determine an SRS transmission subframe, B SRS} , which is a parameter used to determine an SRS transmission resource block, and n _{RRC. , k TC} , which is a parameter used to determine the subcarrier to which the SRS is allocated, is a parameter used to determine the cyclic shift of the SRS

, and the number of antenna ports. Meanwhile, the parameters srs-SubframeConfig and C _SRS may not be included in the above-described parameter set.

10 illustrates an aperiodic SRS without frequency hopping and an aperiodic SRS with frequency hopping according to another embodiment.

Referring to FIG. 10 , aperiodic SRS transmission in the last symbol of a subframe in the frequency domain must cover a frequency band of interest for frequency domain scheduling.

As shown in (a) of FIG. 10 , aperiodic SRS transmission that is wide enough to estimate the channel quality for the entire frequency band of interest can be performed with a single aperiodic SRS transmission. Meanwhile, as shown in (b) of FIG. 10, by transmitting the narrowband aperiodic SRS while hopping in the frequency domain, these aperiodic SRS transmissions may be combined to cover the entire frequency band of interest.

Unlike the one shown in FIG. 10B , the narrowband aperiodic SRS frequency hopping may support one-shot aperiodic SRS. In this case, the frequency position may be determined by the subframe index in which the aperiodic SRS is transmitted. Meanwhile, frequency hopping equations for periodic SRS may be reused or equations may be newly defined. On the other hand, frequency hopping band for aperiodic SRS srs - HoppingBandwidth - ap ( b _hop for aperiodic SRS) may be configured separately from periodic SRS. Frequency hopping band for this aperiodic SRS srs - HoppingBandwidth - ap may be common to all RRC configuration sets or may be different for each RRC configuration set. In the latter case, a frequency hopping band for aperiodic SRS corresponding to each of the SRS configuration sets by RRC signaling may be defined.

에 의해 구성될 수 있다.For example, aperiodic SRS frequency hopping is a parameter provided by the upper layer parameter srs -HoppingBandwidth-ap.

can be configured by

) 주파수 호핑 인덱스

는 특정 값으로 유지하며

로 정의될 수 있다. 이때 파라메터

은 비주기적 전송에 대한 상위계층 파라메터인 freqDomainPosition -ap에 의해 주어진다. 만약 비주기적 SRS의 주파수 호핑이 인에이블되면 (예를 들어

), 주파수 호핑 인덱스

는 아래 수학식 7에 의해 정의된다. If frequency hopping of aperiodic SRS is not enabled (for example,

) frequency hopping index

is kept at a certain value and

can be defined as In this case, the parameter

is given by freqDomainPosition - ap, which is an upper layer parameter for aperiodic transmission. If frequency hopping of aperiodic SRS is enabled (eg

), frequency hopping index

is defined by Equation 7 below.

[Equation 7]

는 각 상향링크 대역(

)에 대해 주기적 SRS와 동일한 표로 주어진다. F_b(n _SRS)는 아래 수학식 8에 의해 주어진다.At this time

is each uplink band (

) is given in the same table as the periodic SRS. F _b ( n _SRS ) is given by Equation 8 below.

[Equation 8]

이다. 한편, nSRS는 아래 수학식 9으로 정의될 수 있다.At this time

am. Meanwhile, nSRS may be defined by Equation 9 below.

[Equation 9]

는 단말-특정 SRS 전송의 주기이며,

는 SRS 서브프레임의 오프셋이고

는 SRS 서브프레임의 오프셋의 구성에 대한 최대값이다.At this time

is the period of terminal-specific SRS transmission,

is the offset of the SRS subframe

is the maximum value for the configuration of the offset of the SRS subframe.

As described above, when the mapping of the frequency-hopping aperiodic SRS to the resource element is completed, an SC-FDMA symbol is generated through an SC FDMA generator (not shown in FIG. 7) and the SRS signal is transmitted to the transmission/reception point.

Example 3 : SRS power control

11 is a flowchart of a method for controlling uplink power according to another embodiment.

Referring to FIGS. 1 and 11 , a first transmission/reception point corresponding to a serving cell, for example, the eNB 110 may transmit a PDSCH to the terminal 120 , at least one transmission/reception point, for example, transmission/reception points For example, a second transmission/reception point, for example, the RRH 122 is searched (S1101).

At this time, the CoMP system according to another embodiment will be described below as a cooperative multi-cell communication system described with reference to FIG. 4, but is not limited thereto. Of course, at this time, the number of transmission/reception points participating in cooperative communication may be 4 as shown in FIGS. 4 and 5, but is not limited thereto, and may be 2, 3, or 5 or more. However, for convenience of explanation, transmission/reception points participating in cooperative communication will be described as first to fourth transmission/reception points as shown in FIGS. 4 and 5 .

In step S1101, the first transmission/reception point 110 may designate second to fourth transmission/reception points for executing downlink to the terminal 120, and the second to fourth transmission/reception points for executing downlink according to changes in the environment of the system. It may be changed by the first transmission/reception point 110 .

Therefore, the first transmission/reception point 110 searches not only the transmission/reception point for transmitting the PDSCH to the current terminal 120, but also all transmission/reception points likely to transmit the PDSCH to the terminal 120, and then selects at least one optimal transmission/reception point. assigned to the terminal. Here, allocating a transmission/reception point means that the terminal 120 notifies the terminal 120 of information necessary to receive a signal from each transmission/reception point.

The first transmission/reception point 110 corresponding to the serving cell transmits information about a CoMP set for cooperative transmission to a higher layer message, for example, RRC (Radio Resource Control) signaling and a downlink control channel. may be transmitted to the terminal 120 through the

Next, the first transmission/reception point 110 transmits terminal-specific reference signal configuration information of the found second to fourth transmission/reception points to the terminal 120 . The UE-specific reference signal may be, for example, CSI-RS or DM-RS.

When the UE-specific reference signal is a CSI-RS, the first transmission/reception point transmits CSI-RS transmission power information and CSI-RS configuration information of the discovered second and third transmission/reception points to the UE 120 .

The CSI-RS transmission power information and the CSI-RS configuration information may be stored as a table in the terminal 120 or preset in the system so that the terminal 120 may know in advance.

The above-described CSI-RS transmission power information and CSI-RS configuration information may be transmitted in a radio resource control (RRC) format as a higher layer. Alternatively, they may be transmitted in the form of system information.

When the terminal-specific reference signal is a DM-RS, the first transmission/reception point 110 transmits DM-RS transmission power information and DM-RS configuration information of the discovered second and third transmission/reception points to the terminal 120 in step S502. send. DM-RS transmission power information and DM-RS configuration information are stored in the terminal 120 as a table.

The DM-RS is provided for the transmission of the PDSCH. In a wireless communication system, a DM-RS is precoded in a precoder using a precoding matrix such as a PDSCH. The first Tx/Rx point 110 may have a maximum of 8 antenna ports, and thus, the number of layers used for transmission of the PDSCH may be a maximum of 8. Therefore, the first transmission/reception point 110 may use a maximum of 8 DM-RS ports when transmitting the PDSCH.

In a situation where each transmission/reception point shares the same cell ID, the terminal 120 may receive one or more transmit power control (TPC) commands from the first transmission/reception point 110 (S1110).

The TPC command may be included in a response message to a preamble for random access (PRACH) or transmitted through a Physical Downlink Control CHannel (PDCCH). The PDCCH has various formats according to Downlink Control Control (DCI), and a TPC command transmitted according to the format may be different.

As an example, the terminal 120 provides a PDCCH of various formats, such as a format for downlink scheduling, a format for uplink scheduling, a TPC-only format for an uplink data channel (PUSCH), and a TPC-only format for an uplink control channel (PUCCH). can receive In addition, the TPC command may be used to determine transmit power for each component carrier, transmit power for a group of component carriers, or transmit power for all component carriers. In addition, the TPC command may be used to determine the transmit power for each signal (eg, PUSCH, PUCCH, etc.). The TPC command includes a format for downlink scheduling, a format for uplink scheduling, a TPC-only format for an uplink data channel (eg, PUSCH), and a TPC-only format for an uplink control channel (eg, PUCCH) PDCCH of various formats. can be received through

_{As will be described later, the TPC command may include h c} (i), which is UE-specific SRS transmission power information for adjusting SRS transmission power used for SRS power control. SRS power control when h _c (i) may be replaced by the f _c (i) or added to f _c (i). Through this, the transmission/reception point, which is the serving cell, can control the SRS transmission power independently or additionally from the PUSCH transmission power.

The terminal 120 receives a cell-specific reference signal and/or a terminal-specific reference signal, for example, CSI-RS and DM-RS from the first transmission/reception point 110 (S1111).

The UE 120 receives a UE-specific RS, for example, a CSI-RS and a DM-RS from transmission/reception points for transmitting the PDSCH, for example, the second transmission/reception point 122 (S1112). ).

)을 계산한다(S1120). The UE 120 determines the actual path loss for a specific transmission/reception point based on one or more reference signals among CRS, CSI-RS, and DM-RS.

) is calculated (S1120).

In step S1120, the terminal 120 may always receive the CRS through the first transmission/reception point 110 corresponding to the serving cell and calculate the path loss from the first transmission/reception point 110 based on the CRS.

In an environment in which at least one transmission/reception point has the same cell ID, since the other transmission/reception points except the first transmission/reception point 110 do not transmit CRS, path loss from other transmission/reception points cannot be measured.

In step S1120, when the terminal 120 knows the transmission power of the transmission/reception points, for example, the CSI-RS or DM-RS of the second transmission/reception point 122, the terminal 10 is the CSI-RS or DM-RS It is possible to calculate the downlink path loss from the second transmission/reception point 122 for transmitting the PDSCH by measuring the received power of .

Specifically, each transmission/reception point including the first transmission/reception point corresponding to the serving cell has a CSI-RS or DM-RS configuration distinguishable from other transmission/reception points, for example, a sequence, ports, and mapping. ) or a subframe, and information on this CSI-RS or DM-RS configuration may be notified to the UE 120 .

Based on this CRS, CSI-RS or DM-RS configuration, the terminal 120 may measure the path loss for at least one transmission/reception point, and may perform uplink transmission power control based on the measurement result. There is (S1130).

(One) PUCCH transmission power

When each UE transmits the PUCCH for the serving cell (c), the transmission power (P _{PUCCH ,C} (i)) of the PUCCH in the subframe (i) may be determined by the following Equation (10).

[Equation 10]

In Equation 10, P _{CMAX ,c} (i) is the maximum transmission power of the terminal 320 in subframe (i) for the serving cell (c), and the PUCCH transmission power is limited by the maximum transmission power of the terminal 320 do.

P _{0 _ PUCCH} is a factor for the received power which must be guaranteed it in transmitting the PUCCH. P _{0 _ PUCCH} is a factor for the received power required to obtain the received SINR (Signal-to-interference and noise ratio) required in the transmission and reception points, is determined by the PUCCH format.

PL _c is a downlink path loss estimate calculated by the terminal 320 for the serving cell c, and PL _c = (Reference Signal Transmission Power - Reference Signal Received Power (RSRP)) is determined by the

h(n _CQI , n _{HARQ ,} n _{SR ) is n CQI} corresponding to the number of information bits for CQI (Channel Quality Information), _{n HARQ} which is the number of HARQ bits transmitted in subframe (i) and a power offset by _{n SR} indicating whether the subframe (i) is configured as an SR (Scheduling Request) for the UE. Δ _{F_ PUCCH} (F) is the offset which is determined by the PUCCH format (F). Δ _TxD (F') is an offset considering a case in which the terminal 10 is configured to transmit PUCCH in two antenna ports.

g(i) is a value for directly adjusting PUCCH transmit power through an explicit transmit power control command. g(i) is a cumulative value that increases or decreases by a specified amount. g(i) may be included in the downlink scheduling assignment or may be provided on a special PDCCH that simultaneously provides a transmit power control command to multiple terminals. For example, it may correspond to DCI format 3/3A. g (i) may be used for the purpose of compensating for changes in the applications, P _{0 _} uplink interference that are not reflected in the _PUCCH to compensate for uplink multi-path fading that are not reflected in the DL path loss.

(2) PUSCH transmission power

In the wireless communication system, when each terminal 320 does not transmit the PUSCH and the PUCCH for the serving cell c at the same time, the transmission power of the PUSCH in the subframe (i) (P _{PUSCH ,c} (i)) is calculated by the following math It can be determined by Equation 11.

[Equation 11]

In the wireless communication system, when each terminal 320 transmits the PUSCH and the PUCCH for the serving cell at the same time, the transmission power of the PUSCH in the subframe (i) (P _{PUSCH ,c} (i)) is in Equation 12 below can be determined by

[Equation 12]

는 P_{CMAX ,c}(i)의 선형 값(linear value)이다.

는 수학식 10에서 규정된 P_PUCCH(i)의 선형 값이다. 수학식 11를 참조하면, PUSCH를 PUCCH와 동시에 전송하지 않는 경우, PUSCH 전송 전력은 단말(320)의 최대 전송 전력에 의해 제한된다. 수학식 12을 참조하면, PUSCH를 PUCCH와 동시에 전송하는 경우, PUSCH 전송 전력은 단말(320)의 최대 전송 전력에서 PUCCH의 전송 전력만큼의 제한 값에 의해 제한된다.In Equations 11 and 12, P _{CMAX ,c} (i) is the maximum transmit power of the terminal 320 in subframe (i) for the serving cell (c),

is the linear value of P _{CMAX ,c} (i).

is a linear value of _{P PUCCH} (i) defined in Equation (10). Referring to Equation 11, when the PUSCH is not transmitted simultaneously with the PUCCH, the PUSCH transmission power is limited by the maximum transmission power of the UE 320 . Referring to Equation 12, when the PUSCH is simultaneously transmitted with the PUCCH, the PUSCH transmission power is limited by a limit value equal to the transmission power of the PUCCH from the maximum transmission power of the UE 320 .

M _{PUSCH ,c} (i) is the bandwidth of PUSCH resource allocation expressed by the number of effective resource blocks for the serving cell (c) and subframe (i). Allocation of more resource blocks requires higher transmit power.

P _{0 _ PUSCH ,c} (j) is a factor for the received power that must be guaranteed in transmitting the PUSCH. P _{0 _ PUSCH} is a factor for reception power required to obtain a reception SINR required at a transmission/reception point, and is determined by a PUSCH format or the like. P _{0 _ PUSCH} is a value determined based on the interference level at the transmission/reception point, and the interference may vary depending on the system construction situation, and since the load in the network changes with time, it may also vary with time. j = 0 for PUSCH (re) transmission for semi-persistent grant (grant), j = 1 for PUSCH (re) transmission for dynamically scheduled grant, and random j=2 for PUSCH (re)transmission for granting a random access response.

α _c (j) represents the degree of compensating for path loss. If α _c (j) is 1, it means that the path loss is fully compensated, and when α _c (j) is less than 1, it means that the path loss is not fully compensated. When j = 0 or 1, α _c (j) ∈ {0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1}, and when j = 2 α _c (j) = 1.

PL _c is a downlink path loss (path loss) estimate calculated by the terminal 120 for the serving cell c, and PL _c = (Reference Signal Transmission Power - Reference Signal Received Power (RSRP)) ) can be determined by

ΔTF,c(i) is an offset determined by a Modulation and Coding Scheme (MCS) for the serving cell c.

f _c (i) is a value for directly adjusting PUSCH transmission power through an explicit transmission power control command. f _c (i) is a cumulative value that increases or decreases by a certain amount. f _c (i) is included in the uplink scheduling grant (UL grant).

의 식으로 표현될 수 있다.

는 서브프레임

에서 DCI 포맷 0 또는 3/3A로 PDCCH로 신호될 수 있다. 누적이 가능하지 않을 때

이다.More specifically,

can be expressed in the form of

is the subframe

In DCI format 0 or 3/3A, it may be signaled on the PDCCH. When accumulation is not possible

am.

)은 다음의 수학식 13와 같다.When the serving cell (c) is a primary cell (primary cell), the transmission power of the PUCCH in the subframe (i) (

) is the following Equation 13.

[Equation 13]

In Equation 13, P _{CMAX ,c} (i) is the maximum transmission power of the terminal 10 in subframe (i) for the serving cell (c), and the PUCCH transmission power is limited thereto.

)과 단말-특정 전력 레벨(

)로 구성된다.P _{0 _ PUCCH} is the common power level (

) and the terminal-specific power level (

) is composed of

In other words, P _{0 _ PUCCH} is a factor for received power that must be guaranteed in transmitting the PUCCH. P _{0 _ PUCCH} is a factor for the received power required to obtain the received SINR required by the base station, are determined by the PUCCH format.

PLc is a downlink path-loss estimate calculated by the terminal 10 for the serving cell c, and PLc = (Reference Signal Transmission Power - Reference Signal Received Power (RSRP)) is determined in this way

h(n _CQI , n _{HARQ ,} n _{SR ) is n CQI} corresponding to the number of information bits for Channel Quality Information ( _{CQI), n HARQ} which is the number of HARQ bits transmitted to subframe (i), and subframe (i) ) is a power offset by _{n SR} indicating whether it is configured as an SR (Scheduling Request) for the UE.

이다.For PUCCH Formats 1, 1a and 1b

am.

이고, 다른 경우

이다.For PUCCH format 1b with channel selection, when the UE is configured with one or more serving cells

, and in other cases

am.

이다.In case of PUCCH format 2, 2a, 2b and normal cyclic prefix,

am.

이다.In case of PUCCH format 2 and extended cyclic prefix,

am.

이다.For PUCCH format 3, when the UE is configured by a higher layer to transmit PUCCH through two antenna ports, or when the UE transmits 11-bit or more HARQ-ACK,

am.

For PUCCH format 3, other cases

이다.

am.

Δ _{F_ PUCCH} (F) is the offset which is determined by the PUCCH format (F).

Δ _TxD (F') is an offset considering a case in which the terminal 10 is configured to transmit PUCCH in two antenna ports.

g(i) is a value for directly adjusting PUCCH transmission power through an explicit power control command. g(i) is a cumulative value that increases or decreases by a specified amount. g(i) is included in the downlink scheduling assignment (DCI format 1A/1B/1D/1/2A/2/2B), or may be provided on a special PDCCH that simultaneously provides a power control command to multiple terminals (DCI format 3/3A). g (i) may be used for the purpose of compensating for changes in the applications, P _{0 _} uplink interference that are not reflected in the _PUCCH to compensate for uplink multi-path fading that are not reflected in the DL path loss.

의 식으로 표현될 수 있다. g(i)는 현재 PUCCH 전력 제어 조절 상태이고, g(0)는 리셋 후 초기값이다.
More specifically,

can be expressed in the form of g(i) is the current PUCCH power control adjustment state, and g(0) is the initial value after reset.

(3) SRS transmission power

)은 다음의 수학식 14와 같이 규정된다.The terminal transmit power of the SRS transmitted in the subframe (i) for the serving cell (c) (

) is defined as Equation 14 below.

[Equation 14]

In Equation 14, P _{CMAX ,c} (i) is the maximum transmission power of the terminal 10 in subframe (i) for the serving cell (c), and the SRS transmission power is limited thereto.

는 오프셋값으로서 서빙 셀(c)에서 m=0 그리고 m=1에 대해 상위 계층에 의해 규정되는 반-정적 4-비트 인자이다. 트리거 타입(trigger type) 0으로 주어진 SRS 전송일 때 m=0이고, 트리거 타입 1로 주어진 SRS 전송일 때 m=1이다. Ks=1.25일 때,

는 [-3,12]dB 범위에서 1 dB 간격의 크기를 갖는다. Ks=0일 때,

는 [-10.5,12]dB 범위에서 1.5 dB 간격의 크기를 갖는다. 한편 P_SRS_offset(0) 및 P_SRS_offset(1)의 범위는 예를 들어[-18, 28.5]dB로 전술한 범위보다 크고 그 간격은 1dB 또는 1.5dB와 같거나 크거나 작을 수 있다.

is a semi-static 4-bit factor specified by the upper layer for m=0 and m=1 in the serving cell c as an offset value. In case of SRS transmission given as trigger type 0, m=0, and in case of SRS transmission given as trigger type 1, m=1. When Ks=1.25,

has a size of 1 dB interval in the range of [-3,12]dB. When Ks = 0,

has a magnitude of 1.5 dB intervals in the range of [-10.5,12]dB. Meanwhile, the ranges of P_SRS_offset(0) and P_SRS_offset(1) are, for example, [-18, 28.5] dB, which is larger than the aforementioned range, and the interval may be equal to, greater than, or smaller than 1 dB or 1.5 dB.

Meanwhile, a power offset for aperiodic SRS power control may be P_SRS_offset(2) (m=2). The power offset for aperiodic SRS power control (P_SRS_offset(2)) may be a specific number of bits, for example, a 5-bit parameter.

When Ks=1.25, P_SRS_offset(2) may have a size of 1 dB interval in the range of [-3,28]dB. When Ks=0, P_SRS_offset(2) may have a size of 1.5 dB intervals in the range of [-18, 28.5] dB or may have a size of 1.5 dB intervals in the range of [-10.5,28.5] dB.

M _{SRS ,c} is the bandwidth of SRS transmission in the subframe (i) for the serving cell (c) expressed by the number of resource blocks.

f _c (i) is as defined in Equations 11 and 12.

_{Meanwhile, h c} (i) adjusted through a new transmit power control command (TPC command) may be used for SRS power control. h _c (i) is a value for adjusting SRS transmission power through a UE-specific SRS transmission power control command (UE-specific SRS TPC). h _c (i) is a cumulative value and may increase or decrease by a specific amount or may be a non-cumulative value. SRS power control when h _c (i) may be replaced by the f _c (i) or added to f _c (i).

)은 다음의 수학식 15와 같이 표현될 수 있다. In the case of SRS power control, h _c (i) is the terminal transmission power of SRS transmitted in subframe (i) for the serving cell (c) when _{f c (i) is replaced (}

) can be expressed as in Equation 15 below.

[Equation 15]

)은 다음의 수학식 16과 같이 표현될 수 있다. _{When h c} (i) is _{added to f c} (i) during SRS power control, the terminal transmission power of the SRS transmitted in the subframe (i) for the serving cell (c) (

) can be expressed as in Equation 16 below.

[Equation 16]

h _c (i) is included in a response message to a preamble for random access (PRACH), included in downlink scheduling, or included in an uplink scheduling grant (UL grant) of DCI format 0 or 4, or , may be signaled by a higher layer, for example, RRC. For example, in the case included in downlink scheduling, h _c (i) is downlink scheduling DCI formats scrambled by SRS-specific RNTI, for example, DCI format 3/3A. may be signaled by

Aperiodic SRS transmission may _{use a new power control method using h c} (i) or an existing power control method using fc(i). In particular, aperiodic SRS parameter sets may be implemented as including new power control using _{h c (i).} For example, the new SRS power control may be linked with an aperiodic SRS configuration triggered by downlink DCI formats, for example, DCI format 1a/2b/2c (o The new SRS power control is linked to the A-SRS) configurations triggered by DL DCI formats (1a/2b/2c)).

P _{0 _ PUSCH ,c} (j) and α _c (j) are as defined in Equations 2 and 3, and j=1.

Next, when the transmission power for the uplink physical channel is controlled, the terminal 120 generates an uplink physical channel having the corresponding transmission power, and then the terminal 120 transmits it to each transmission/reception point through the generated uplink physical channel. (S1130, S1132, S1134).

Although not limited thereto, the control of transmission power for the uplink physical channel may be performed in the frequency domain before the IFFT. In this case, the control of the transmission power may be performed in units of subcarriers, for example, by multiplying a modulation value mapped to a subcarrier by a weight. The weights may be multiplied using a diagonal matrix (power diagonal matrix) in which each element represents a value related to transmit power. In the case of a multiple input multiple output (MIMO) system, transmit power may be controlled using a weighted precoding matrix or may be controlled by multiplying a precoded modulation value by a power diagonal matrix. Accordingly, even when a plurality of physical channels are included in a frequency band to which the same IFFT is applied, it is possible to easily control the transmission power of each physical channel.

In addition, with/separately from power control in the frequency domain, control of transmit power for an uplink physical channel may be performed in the time domain after IFFT. Specifically, transmission power control in the time domain may be performed in various functional blocks. As an example, transmit power control may be performed in a DAC block and/or an RF block.

In the present specification, simultaneous or the same time period includes the same TTI or subframe.

Meanwhile, the LTE/LTE-A system defines the use of component carriers (CCs), which are a plurality of unit carriers, as a method for extending a bandwidth to satisfy a system requirement, that is, a high data rate. Here, one CC may have a bandwidth of up to 20 MHz, and resource allocation is possible within 20 MHz depending on the service, but this is only an example according to the process of implementing the system, and depending on the implementation of the system, a bandwidth of 20 MHz or more can be set to have. In addition, it is possible to define the use of a carrier aggregation (CA) technique in which a plurality of component carriers are bundled and used as one system band.

As an example, when five component carriers having a maximum bandwidth of 20 MHz are used, the service quality may be supported by extending the bandwidth up to 100 MHz. The allocatable frequency band that can be determined by the component carriers may be contiguous or non-contiguous according to the scheduling of the actual CA.

In a CA environment, in order to efficiently manage a plurality of component carriers, a plurality of component carriers may be divided into one primary component carrier (PCC) and one or more secondary component carriers (SCC). Alternatively, the PCC may be referred to as a primary cell and the SCC may be referred to as a secondary cell.

The main component carrier (PCC) plays a role of a core carrier managing all the integrated component carriers, and the remaining sub-component carriers (SCC) may serve to provide additional frequency resources to provide a higher data rate. . For example, PUCCH and PUSCH including UCI for uplink control in uplink may be transmitted only through a principal carrier (PCC), and PUCCH and PUSCH including UCI are transmitted through a sub-component carrier (SCC). it may not be

Alternatively, in order to efficiently manage a plurality of component carriers, an index (serving cell index) (ServCellIndex) may be designated for the plurality of component carriers. For example, when five component carriers (CC0, CC1, CC2, CC3, CC4) are integrated, the serving cell index (ServCellIndex) of each component carrier may be designated as 0 to 4. For example, in the above example, CC0 having a serving cell index of 0 may be a primary carrier (PCC), and CC1 to CC4 having a serving cell index of 1 to 4 may be a sub-carrier (SCC).

Next, consider a case in which SRS is transmitted simultaneously with PUCCH, PUSCH, and/or other SRS in a plurality of component carriers and a single subframe.

The priority of power allocation may be in the order of PUCCH, PUSCH, and SRS. The PUCCH is for uplink control and may have the highest priority. PUSCH may have priority after PUCCH. Among PUSCHs, a PUSCH with UCI may have priority over a PUSCH without UCI. SRS is used for scheduling of resource blocks in a subsequent uplink and has a lower priority than PUCCH and PUSCH. This is summarized in Table 12 below.

[Table 12]

12 is a diagram illustrating a configuration of a transmission/reception point according to another embodiment.

Referring to FIG. 12 , a transmission/reception point 1200 according to another embodiment includes a control unit 1210 , a transmission unit 1220 , and a reception unit 1230 . The transmission/reception point 1200 may be the aforementioned transmission/reception points, for example, the eNB 110 and/or the RRH 112 , or the base station or cell described with reference to FIG. 1 .

The control unit 1210 controls the overall operation of the transmission/reception point according to the CoMP operation required for carrying out the above-described present invention. The controller 1210 processes the uplink demodulation reference signal by controlling the transmitter 1020 and the receiver 1230 .

The transmitter 1220 and the receiver 1230 are used to transmit/receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

The transmitter 1220 transmits two or more parameters for determining a time-frequency resource through which an aperiodic sounding reference signal is transmitted through higher layer signaling and designates a parameter set including some of the parameters. index to be transmitted through at least one of PDCCH and EPDCCH, and a signal triggering an aperiodic sounding reference signal may be transmitted through at least one of PDCCH and EPDCCH.

The receiving unit 1230 transmits a frequency to a frequency domain of a part of the entire frequency band of interest through a time-frequency resource according to a parameter received through higher layer signaling and a parameter included in a parameter set received through at least one of PDCCH or EPDCCH. It is possible to receive an aperiodic sounding reference signal by hopping.

13 is a diagram showing the configuration of a user terminal according to another embodiment.

Referring to FIG. 13 , a user terminal 1300 according to another embodiment includes a receiver 1310 , a controller 1320 , and a transmitter 1330 . The user terminal 1300 may be the terminals 120 and 122 described with reference to FIGS. 1 to 11 , but is not limited thereto.

The receiver 1310 receives downlink control information, data, and a message from a transmission/reception point through a corresponding channel.

In addition, the control unit 1320 controls the overall operation of the base station according to the CoMP operation necessary for carrying out the above-described present invention.

The OFDM modulator 710 , the resource element mapper 720 , and the not shown SC FDMA generator described with reference to FIG. 7 may be included in the controller 1320 .

The transmitter 1330 transmits downlink control information, data, and a message to a transmission/reception point through a corresponding channel.

Specifically, the receiver 1310 receives two or more parameters for determining a time-frequency resource through which the above-described aperiodic sounding reference signal is transmitted through higher layer signaling, and includes some of the parameters. An index designating a parameter set to be used may be received through at least one of a PDCCH or an EPDCCH, and a signal triggering an aperiodic sounding reference signal may be received through at least one of the PDCCH or the EPDCCH.

The transmitter 1330 transmits a frequency domain of a part of the entire frequency band of interest through a time-frequency resource according to a parameter received through the above-described higher layer signaling and a parameter included in a parameter set received through at least one of PDCCH or EPDCCH. frequency hopping to transmit the aperiodic sounding reference signal.

A part of this specification is omitted in order to simplify the description of the content specification related to the standard mentioned in the above embodiment, and constitutes a part of this specification. Accordingly, it should be construed as falling within the scope of the present invention to add some of the contents related to the above standard specification to the present specification or to be described in the claims.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

Claims (4)

Receiving two or more parameters for determining a time-frequency resource through which an aperiodic sounding reference signal is transmitted through higher layer signaling;
receiving an index designating a parameter set including some of the parameters through at least one of a PDCCH and an EPDCCH;
receiving a signal triggering the aperiodic sounding reference signal through at least one of the PDCCH and the EPDCCH; and
Frequency hopping in a frequency domain of a part of the entire frequency band of interest through a time-frequency resource according to a parameter received through the higher layer signaling and a parameter included in a parameter set received through at least one of the PDCCH or the EPDCCH Transmitting the aperiodic sounding reference signal,
Each of the parameters includes a transmission comb and a cyclic shift index,
In the step of transmitting the aperiodic sounding reference signal by frequency hopping to a frequency domain of a part of the entire frequency band, the aperiodic sounding reference signal is independently converted to a PUSCH and a PUCCH to a base station different from the base station that has received the parameter send,
In a CoMP implementation situation in which the transmission/reception points use the same cell ID, the cell ID is used as it is when generating the aperiodic SRS sequence, but when generating the PUSCH and PUSCH-related DM-RS sequence, a virtual cell ID independent of the physical cell (

) and a virtual cell ID independent of the cell ID when generating a sequence of DM-RS associated with PUCCH and PUCCH (

) of a terminal using an aperiodic sounding reference signal transmission method. According to claim 1,
In the step of transmitting the aperiodic sounding reference signal by frequency hopping to a frequency domain of a part of the entire frequency band,
A method of transmitting an aperiodic sounding reference signal of a terminal, characterized in that the one-time aperiodic sounding reference signal is transmitted in the partial frequency domain. According to claim 1,
In the step of transmitting the aperiodic sounding reference signal by frequency hopping to a frequency domain of a part of the entire frequency band,
The method of transmitting an aperiodic sounding reference signal of a terminal, characterized in that the aperiodic sounding reference signal is transmitted to a base station different from the base station that has received the parameter independently of PUSCH and PUCCH. Transmitting two or more parameters for determining a time-frequency resource through which an aperiodic Sounding Reference Signal is transmitted through higher layer signaling;
transmitting an index designating a parameter set including some of the parameters through at least one of a PDCCH and an EPDCCH;
transmitting a signal triggering the aperiodic sounding reference signal through at least one of the PDCCH and the EPDCCH; and
Frequency hopping in a frequency domain of a part of the entire frequency band of interest through a time-frequency resource according to a parameter received through the higher layer signaling and a parameter included in a parameter set received through at least one of the PDCCH or the EPDCCH Receiving the aperiodic sounding reference signal,
Each of the parameters includes a transmission comb and a cyclic shift index,
In a CoMP implementation situation in which the transmission/reception points use the same cell ID, the cell ID is used as it is when generating the aperiodic SRS sequence, but when generating the PUSCH and PUSCH-related DM-RS sequence, a virtual cell ID independent of the physical cell (

) and a virtual cell ID independent of the cell ID when generating a sequence of DM-RS associated with PUCCH and PUCCH (

) of a base station using an aperiodic sounding reference signal receiving method.

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