WO2012020933A2

WO2012020933A2 - Method and device for aperiodically transmitting/receiving reference signal for estimating channel without resource conflict

Info

Publication number: WO2012020933A2
Application number: PCT/KR2011/005470
Authority: WO
Inventors: 서성진; 홍성권
Original assignee: (주)팬택
Priority date: 2010-08-11
Filing date: 2011-07-25
Publication date: 2012-02-16
Also published as: WO2012020933A3; KR20120015226A

Abstract

The present invention relates to a method and a device for aperiodiacally transmitting/receiving a reference signal for estimating a channel without resource conflict. The method for receiving the aperiodic reference signal for estimating the channel, according to one embodiment of the present invention, comprises: a step of the device for receiving the reference signal for estimating the channel transmitting reference signal transmission control information combining a first indication information which indicates the transmission of the aperiodic reference signal for estimating the channel of a first user terminal and the suspension of transmitting the periodic reference signal for estimating a channel of a second user; and a step of receiving the aperiodic reference signal for estimating the channel transmitted from the first user terminal, wherein the second user terminal is planned to transmit the periodic reference signal for estimating the channel from the frequency and the time domain, from which the first user terminal transmits the aperiodic reference signal for estimating the channel.

Description

Method and apparatus for aperiodically transmitting and receiving reference signal for channel measurement without resource collision

The present specification relates to a wireless communication system, and in particular, an aperiodic transmission of a reference signal for measuring a state of a resource in an OFDMA wireless communication system to be transmitted and received without collision with another signal, so that a reference signal for measuring a channel It is to provide a method and apparatus for transmitting and receiving aperiodic periodically.

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

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

In addition, many current communication systems use various signals to provide information on a communication environment to the counterpart device through uplink or downlink, and as an example of a signal, a reference signal (reference signal, or reference signal, RS) is used. Are being used.

For example, in an LTE system, which is one of mobile communication methods, a channel measurement or channel estimation reference signal indicating a channel state of a user equipment (hereinafter referred to as UE or UE) during uplink transmission. A sounding reference signal (SRS) is transmitted to the base station apparatus. Meanwhile, in order to identify channel information during downlink transmission, a cell-specific reference signal (CRS), which is the reference signal or the reference signal, is transmitted every subframe.

Meanwhile, the reference signals for measuring or estimating such a channel are periodically transmitted by the base station apparatus in the case of an uplink reference signal, that is, a base station apparatus in the case of an uplink reference signal and transmitted to the reference signal receiver. Is common.

However, in recent years, due to the flexibility of the communication system, and the like to discuss the transmission of the channel measurement reference signal aperiodically, a specific method for this has not been determined. In consideration of such a situation, in the current communication system, a specific transmission scheme for the aperiodic channel estimation reference signal is required.

An embodiment of the present disclosure provides a technique for transmitting and receiving a reference signal by avoiding resource collision in aperiodic transmission of a reference signal for channel measurement.

In addition, an embodiment of the present disclosure provides a non-periodic transmission technique of a reference signal for channel measurement for measuring or estimating a channel state of a terminal in a communication system.

In addition, an embodiment of the present disclosure provides a technique for controlling terminals for periodically transmitting a reference signal for channel measurement in order to aperiodically transmit a reference signal for channel measurement in a communication system.

In addition, an embodiment of the present disclosure provides a technology that the indication information for controlling the transmission of the reference signal for aperiodic channel measurement can be delivered to the user terminal more quickly.

According to an embodiment of the present disclosure, a method of receiving a reference signal for aperiodic channel measurement may include: first indication information for indicating that a channel measurement reference signal receiving apparatus instructs aperiodic channel estimation reference signal transmission of a first user terminal; Transmitting reference signal transmission control information incorporating second indication information indicative of stopping transmission of the reference signal for periodic channel estimation of the second user terminal, and receiving the reference signal for aperiodic channel estimation transmitted by the first user terminal. And the second user terminal is configured to transmit a reference signal for periodic channel estimation in a frequency and time domain in which the first user terminal transmits the reference signal for aperiodic channel estimation. .

According to another embodiment of the present disclosure, a method for transmitting a reference signal for aperiodic channel measurement may include information for triggering transmission of a reference signal for aperiodic channel measurement from a channel measurement reference signal receiving apparatus. Receiving reference signal transmission control information including at least one of a start point and bandwidth information of an aperiodic channel estimation reference signal to be transmitted by the channel measurement reference signal transmission device from the channel measurement reference signal receiving device; And calculating instruction information indicating a reference signal transmission for aperiodic channel measurement from the reference signal transmission control information to determine the non-period according to the indication information after a predetermined time interval after reception of the received reference signal transmission control information. Transmitting a reference signal for periodic channel measurement.

In accordance with another aspect of the present disclosure, an apparatus for receiving a reference signal for aperiodic channel measurement may include at least one first user terminal and at least one first terminal for transmitting a reference signal for aperiodic channel estimation. Determining unit for determining a second user terminal scheduled to transmit a periodic channel estimation reference signal in a frequency and time domain to which the user terminal to transmit the reference signal for aperiodic channel estimation, aperiodic of the first user terminal A control information generator for generating reference signal transmission control information combining first indication information indicating channel estimation reference signal transmission and second indication information indicating interruption of the periodic channel estimation reference signal transmission of the second user terminal; And a coding unit including the control information in a physical control channel to generate a radio signal. And a transceiver configured to transmit the radio signal to the first user terminal and the second user terminal, and to receive the aperiodic channel estimation reference signal transmitted by the first user terminal.

Reference signal transmission apparatus for aperiodic channel measurement according to another embodiment of the present specification includes a transceiver for transmitting and receiving a signal with a channel measurement reference signal receiving apparatus, a channel measurement reference signal generator for generating a channel measurement reference signal, And receiving information for triggering transmission of the aperiodic channel measurement reference signal received from the channel measurement reference signal receiving apparatus, and starting point of the aperiodic channel estimation reference signal from the channel measurement reference signal receiving apparatus. And when receiving reference signal transmission control information including at least one of bandwidth information, calculating indication information indicating to transmit a reference signal for aperiodic channel measurement from the reference signal transmission control information to receive the received reference signal transmission control information. After receiving a predetermined time interval after the reception of the transceiver unit In accordance with the instruction information to transmit a reference signal for an aperiodic channel measurement and a controller for controlling the channel for measuring a reference signal generator and the transmission and reception parts.

1 illustrates a wireless communication system to which embodiments of the present invention are applied.

2 illustrates a subframe and time slot structure of transmission data that can be applied to an embodiment of the present invention, and a general structure of a time slot according to an embodiment of the present invention.

3 is a diagram illustrating an example of periodic SRS (Periodic SRS) transmission in a communication system to which the present embodiment can be applied.

FIG. 4 is a diagram illustrating a case of holding a transmission of a periodic reference signal in a process of transmitting an aperiodic one-shot reference signal according to an embodiment of the present specification.

FIG. 5 is a diagram illustrating a configuration of reference signal transmission control information indicating an indication of aperiodic reference signal transmission and a holding of a periodic reference signal according to an embodiment of the present specification.

6 is a diagram illustrating a content allocation of an aperiodic SRS resource.

7 is a diagram illustrating an example of configuring reference signal transmission control information according to an embodiment of the present specification.

8 is a diagram illustrating an example of assigning an index to receive a holding signaling according to an embodiment of the present specification.

FIG. 9 is a diagram illustrating an example of assigning an index for receiving holding signaling according to another embodiment of the present specification.

FIG. 10 is a diagram illustrating a process of triggering an aperiodic reference signal and providing a holding signal using a new DCI format in a base station according to one embodiment of the present specification.

FIG. 11 is a diagram illustrating a process in which user terminals receive reference signal transmission control information from a base station according to one embodiment of the present specification.

12 is a diagram illustrating a process of receiving a non-periodic reference signal by a channel measurement reference signal receiving apparatus according to one embodiment of the present specification.

FIG. 13 is a diagram illustrating a process of transmitting aperiodic reference signal by the apparatus for measuring channel measurement according to an embodiment of the present specification.

14 is a diagram illustrating a configuration of a reference signal receiving apparatus for measuring a channel according to an embodiment of the present specification.

15 is a diagram illustrating a configuration of a reference signal transmission apparatus for measuring a channel according to an embodiment of the present specification.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Wireless communication systems are widely deployed to provide various communication services such as voice and packet data.

Referring to FIG. 1, a wireless communication system includes a user equipment (UE) 10 and a base station 20 (base station, BS, eNB). The terminal 10 and the base station 20 apply an extended channel-referenced reference signal generation technique as described in the following embodiments, which will be described in detail with reference to FIG. 3 or below.

Terminal 10 in the present specification is a generic concept that means a user terminal in wireless communication, WCDMA, UE (User Equipment) in LTE, HSPA, etc., as well as MS (Mobile Station), UT (User Terminal) in GSM ), SS (Subscriber Station), wireless device (wireless device), etc. should be interpreted as including the concept. Hereinafter, the terminal, the user terminal and the UE will be used interchangeably.

The base station 20 or cell generally refers to all devices, functions, or specific areas communicating with the terminal 10, and includes a Node-B, an evolved Node-B, and a BTS (Base). It may be called other terms such as Transceiver System, Access Point, Relay Node.

That is, in the present specification, the base station 20 or the cell should be interpreted in a comprehensive sense indicating some areas covered by the base station controller (BSC) in the CDMA, the NodeB of the WCDMA, and the like. It is meant to cover various coverage areas such as microcell, picocell, femtocell and relay node communication range.

In the present specification, the terminal 10 and the base station 20 are two transmitting and receiving entities used to implement the technology or technical idea described in the present specification and are used in a comprehensive sense and are not limited by the terms or words specifically referred to. .

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

The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.

One embodiment of the present invention can be applied to resource allocation in the field of asynchronous wireless communication evolving to LTE and LTE-advanced through GSM, WCDMA, 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 interpreted as including all technical fields to which the spirit of the present invention can be applied.

A wireless communication system to which an embodiment of the present invention is applied may support uplink and / or downlink HARQ, and may use a channel quality indicator (CQI) for link adaptation. In addition, multiple access schemes for downlink and uplink transmission may be different from each other. For example, downlink uses Orthogonal Frequency Division Multiple Access (OFDMA), and uplink uses Single Carrier-Frequency Division Multiple Access (SC-FDMA). ) Is the same as can be used.

The layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) model, which are well known in communication systems. The physical layer may be divided into a second layer (L2) and a third layer (L3), and the physical layer belonging to the first layer provides an information transfer service using a physical channel.

2 illustrates a subframe and time slot structure of transmission data applicable to an embodiment of the present invention, and a general structure of a time-slot according to an embodiment of the present invention.

One radioframe or radio frame may consist of 10 subframes 210, and one subframe may include two

slots

202 and 203. In general, the basic unit of data transmission is a subframe unit, and downlink or uplink scheduling is performed on a subframe basis.

One slot may include a plurality of OFDM symbols in the time domain and at least one subcarrier in the frequency domain (frequency band), and one slot may include 7 or 6 OFDM symbols. For example, if a subframe consists of two time slots, each time slot may include seven symbols in the time domain and twelve subcarriers or subcarriers in the frequency domain, such that time is defined as one slot. The frequency domain may be referred to as a resource block or a resource block (RB), but is not limited thereto.

In 3GPP LTE systems, the transmission time of a frame is divided into TTIs (transmission time intervals) of 1.0 ms duration. The terms "TTI" and "sub-frame" may be used in the same sense, and a radio frame or frame according to an embodiment of the present specification is 10 ms long and includes 10 TTIs. can do.

202 illustrates a general structure of a time-slot according to an embodiment of the present invention.

As described above, the TTI is a basic transmission unit, where one TTI includes two

time slots

202 and 203 of equal length, each time slot having a duration of 0.5 ms. Have

Time-slot 202 includes seven long blocks (LB) 211 for a symbol. LBs are separated into cyclic prefixes (CP) 212. Collectively, one TTI or subframe may include 14 LB symbols, but the present specification is not limited to such a frame, subframe or time-slot structure.

Meanwhile, in the LTE communication system, which is one of the current wireless communication methods, a demodulation reference signal (DMRS) and a sounding reference signal are defined in uplink.

Meanwhile, three reference signals (RSs) 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.

That is, in a wireless communication system, the terminal transmits an uplink channel estimation reference signal, which is a type of reference signal, to a single base station in order to transmit uplink channel information to the base station. An example of the channel estimation reference signal may be a sounding reference signal (SRS) used in Long Term Evolution (LTE) and LTE-Advanced, which has the same function as a pilot channel for an uplink channel. .

In the following description, a process and method for controlling aperiodic transmission of a reference signal will be described. The reference signal means a signal transmitted between the terminal and the base station. An example of the reference signal will be described based on the channel estimation reference signal and the sounding reference signal (SRS), which is an embodiment of the present invention. However, the present invention is not limited to the SRS or the channel estimation reference signal. It should be understood as a concept that includes all kinds of reference signals used.

Such SRS should be able to deliver uplink channel information for all bands including not only the band used by each UE but also the band available to the UE to the base station. That is, SRS should be transmitted over all subcarrier bands.

According to the current LTE standard, the SRS sequence is generated by Equation 1 below, and the generated SRS sequence is transmitted according to the subframe configuration as shown in Table 1 after the resource mapping according to a predetermined criterion.

[Equation 1]

here,

Is the length of the reference signal sequence,

U is a PUCCH sequence group number, v is a base sequence number, and a cyclic shift (CS)

to be.

Is an integer value of one of 0 to 7, and is set for each UE by a higher layer.

TABLE 1

Table 1 above is a subframe configuration table of the FDD sounding reference signal defined in LTE. Each format (srsSubframeConfiguration) is defined as 4 bits, and in each case, a transmission period and an actual transmission subframe offset are defined.

That is, when the srsSubframeConfiguration value is 8 (1000 in binary), this means that the SRS is transmitted in the second and third subframes every five subframes.

3 illustrates an example of periodic SRS transmission in a communication system to which the present embodiment can be applied.

Referring to FIG. 3, as an example, when the srsSubframeConfiguration value is 8 (1000 in binary), a configuration of transmitting an SRS in second and third subframes every five subframes is illustrated.

Here, the SRS may be transmitted in the last symbol of each subframe. For example, when one subframe consists of 14 symbols (in the case of Normal Cyclic Prefix), when the SRS is transmitted in the 14th symbol, and consists of 12 symbols (in the case of Extended Cyclic Prefix), SRS is transmitted in the 12th symbol. Of course, the position of the symbol in which the SRS is transmitted herein is not limited thereto.

According to the SRS configuration shown in Table 1 and FIG. 3, the SRS is transmitted periodically (periodic) for each radio frame or transmission period for each cell (base station).

When srcSubframeConfiguration is 8 in Table 1, the configuration period is 5 subframes, and the transmission offsets are 2 and 3.

3 illustrates a case in which the SRS 310 can be transmitted in the last symbol of # 2 and # 3 subframes every five subframes.

4 illustrates the time points 401, 402, 403, 404, 405, 406, 407, and 408 for transmitting the reference signal. At each time point, a frequency domain in which each user terminal (UE) can transmit is divided. 401 indicates an area allocated to the

UE

1, 2, 3, 4, 5 for transmitting the reference signal, and

UE

1, 2, 3, 4, 5 for each divided section of the 401 for transmitting the periodic reference signal. It can be seen that can transmit the reference signal.

When the periodic reference signal is transmitted at 402 when the second subframe is transmitted, the frequency is allocated to

UEs

4, 5, 1, 2, and 3 as shown in 422 so that each UE is assigned a reference signal in the frequency domain allocated to it. Can be sent. However, as shown in 412, UE1 transmits a one-shot wideband aperiodic referential signal. As a result,

UEs

4, 5, 2, and 3 allocated to frequencies, such as 422, should be in a holding state without transmitting a periodic reference signal. Here, holding means that the UE promised to send a periodic reference signal in a corresponding subframe suspends transmission of the periodic reference signal.

As shown in 403 and 404, the periodic reference signal is transmitted again at the transmission time of the third and fourth subframes, and at 405 which is the fifth subframe transmission time, UE3 transmits the one-shot wideband aperiodic reference signal as shown in 414. In this case,

UEs

2, 1, 4, and 5 that transmit the periodic reference signals as shown in 424 at the same subframe transmission time point hold a periodic reference signal by holding signaling, so that the periodic reference signal is aperiodic reference. Do not collide with the signal.

In order to transmit the aperiodic reference signal at a point in time when the periodic reference signal is scheduled to be transmitted in a situation where the periodic reference signal is transmitted according to the information set between the user terminal and the base station, it is necessary to hold the transmission of the periodic reference signal before. In an exemplary embodiment of the present specification, a periodic reference signal is held to a user terminal that will transmit a periodic reference signal in a frequency and time domain overlapping the aperiodic reference signal, and aperiodic to a user terminal to transmit an aperiodic reference signal. The process of instructing transmission of a reference signal will be described.

FIG. 5 is a diagram illustrating a configuration of reference signal transmission control information indicating an indication of aperiodic reference signal transmission and a holding of a periodic reference signal according to an embodiment of the present specification. According to one embodiment of the present specification, an embodiment of a reference signal will be described based on a sounding referential signal (SRS). However, the reference signal is not limited to the SRS, and various reference signals may be used.

FIG. 5 illustrates a method of transmitting aperiodic SRS triggering and holding signaling in a format for downlink allocation. In one embodiment, a new DCI format (Downlink Control Information format, DCI format) is shown. It does not increase blind decoding level by configuring the same size as DCI format 3 / 3A used in the existing LTE, and can be coded by ASRS-RNTI to distinguish it from 3 / 3A. ASRS-RNTI is a kind of code masked to distinguish the DCI format proposed by the present invention. The existing DCI format 3 / 3A uses what is called TPC-RNTI. This part is replaced by ASRS-RNTI to distinguish the format proposed in this specification. Of course, the holding signaling can be delivered through a separate medium.

Referring to the configuration of the reference signal transmission control information 500 of FIG. 5, the information indicating the transmission of the aperiodic reference signal to the UEs that transmit the aperiodic reference signal is included in the 510. Aperiodic reference signal transmission means information necessary for transmitting the aperiodic reference signal, which will be described later. As can be seen in the 510, only one UE may transmit an aperiodic reference signal in the entire frequency band, which is referred to as a wideband aperiodic reference signal transmission. Meanwhile, in some regions of the frequency band, the UE may transmit an aperiodic reference signal, which is referred to as a narrowband aperiodic reference signal transmission. In narrowband aperiodic reference signal transmission, a plurality of UEs may transmit an aperiodic reference signal over a frequency band. Accordingly, since information necessary for transmitting an aperiodic reference signal should be provided to a plurality of UEs, the 510 may be configured with a plurality of indexes. The index is configured from 1 to K and can direct transmission of aperiodic reference signals to up to K UEs. The index of 510 may be referred to as an A-SRS indication index.

Meanwhile, the 520 may indicate to the user terminals transmitting the periodic reference signal whether or not to hold the periodic reference signal. Therefore, for this indication, 1 bit size may be provided as 520. Indexes 1 to N may indicate whether or not the N UEs hold a periodic reference signal. The 530 is for distinguishing between 500 format, which is the reference signal transmission control information, and DCI format 3 / 3A. When the user terminal succeeds in decoding the 530 with the ASRS-RNTI, the user terminal may determine that 500 is the reference signal transmission control information. In addition, the index positions 510 and 520 may be positions uniquely allocated to the UE. Index 1 is not necessarily fixedly allocated to UE1 and may be changed from time to time through higher layer signaling between the base station and the UE, for example, RRC signaling. The index of 520 may be referred to as a holding instruction index. The index of 510 and the index of 520 may be separately managed or may be collectively managed. That is, the numbers of the indexes may be arranged separately such as 510 and 520, or may be collectively arranged as shown in FIGS. 8 and 9 to be described later. Since the index means the position of the A-SRS indication information or the holding indication information, such position information may be arranged.

An example of an aperiodic reference signal will be described with reference to SRS. When the base station configures a format such as 500, the K indexes 510 are required to transmit aperiodic SRS such as bandwidth (BW), period, and starting point of the bandwidth required to transmit the aperiodic SRS. May contain information. The K indexes 510 provide information for transmitting aperiodic SRS to up to K user terminals. N indexes 520 are set to indicate a user terminal that needs to be held. In this case, the size 510 of the field indicated by the K indexes and the size 520 of the field indicated by the N indexes may be different. This is because the information required for holding can be expressed with at least 1 bit, but the information necessary for transmitting aperiodic SRS is more than that. Information necessary for the transmission of the aperiodic SRS will be described later.

If the aperiodic SRS is transmitted over the entire bandwidth, separate resource allocation may be enabled accordingly. That is, in the case where the aperiodic SRS is set to be transmitted only in the full bandwidth, it may be instructed to transmit the aperiodic SRS only to one user terminal, and the holding may be instructed to the other user terminal. In this case, since there is only one A-SRS index portion of 510 and is full-band, it may be implemented not to include information about a starting point or bandwidth. That is, it may include information indicating to inform the specific user terminal that the aperiodic SRS.

The base station pre-allocates an index of DCI format 3 / 3A to several user terminals through signaling, and then, if there is a user terminal that requires power control, the base station is assigned to a field corresponding to the index previously signaled to the user terminal. Power control information is set to transmit DCI format 3 / 3A. Each user terminal may receive information corresponding to itself after receiving the DCI format 3 / 3A. Reference signal transmission control information proposed in one embodiment of the present specification also uses a new DCI format and pre-allocates a unique index to user terminals in the same manner as DCI format 3 / 3A. However, at this time, the index for the field 510 having information necessary for aperiodic SRS transmission may not be allocated in advance, but only an index indicating a field having information for holding may be preallocated.

Looking at the aperiodic SRS as an embodiment of the transmission of the aperiodic reference signal, the information required for the transmission of the aperiodic SRS may be the bandwidth and the starting point of the bandwidth. The necessary items for setting bandwidth information in SRS transmission are as follows. Depending on the bandwidth of the system, it can be configured as follows.

[Table 2] Setting information when 80RB <bandwidth of total system <= 100RB

Table 2 shows SRS bandwidth (BW, BandWidth) configuration. If the bandwidth of the entire system, BW is 80RB (Resource Block) <System BW <= 100RB (Resource Block), the settings in Table 2 can be used. C _SRS (SRS BW configuration parameter) is a cell-specific information determined per cell (cell-specific) is a 3-bit size parameter, B _SRS (SRS BW parameter) is information (UE-specific) set for each UE is a 2-bit parameter. Accordingly, when C _SRS = 0 and B _SRS = 1, the user terminal of the corresponding cell may have 48 RBs in the total 96 RBs as the SRS BW. Whether to transmit to the upper 48RB or the lower 48RB of the 96RB is determined by the SRS start position that comes down to the RRC signaling (signaling). The SRS start position consists of 5 bits, and each position can be represented by dividing the entire system BW into up to 24 pieces.

In addition to Table 2, the SRS bandwidth can be determined according to the bandwidth of the system, and are shown in Tables 3, 4, and 5, respectively.

[Table 3] Setting information when 6RB <= bandwidth of total system <= 40RB

[Table 4] Setting information when 40RB <bandwidth of total system <= 60RB

[Table 5] Setting information when 60RB <bandwidth of total system <= 80RB

[Equation 2]

Equation 2 is a diagram applying Tables 2, 3, 4, and 5 in determining the bandwidth. Using Tables 2, 3, 4, 5 and Equation 2

(The length of the SRS sequence) can be calculated, and as a result, it can be checked to what length the aperiodic SRS resource is allocated.

6 is a diagram illustrating a content allocation of an aperiodic SRS resource. In FIG. 6, a resource for transmitting aperiodic SRS by a specific user terminal is 610. This resource specifies from which frequency point, at which bandwidth, the SRS is transmitted. As described above, when the bandwidth of 610 is the total system bandwidth, an embodiment of the full-band aperiodic reference signal is transmitted. When the bandwidth of 610 is less than the overall system bandwidth, the narrow-band aperiodic reference signal is an embodiment of the transmission.

SRS bandwidth is indicated as starting point of SRS resources and is allocated using C _SRS (3bit), B _SRS (2bit) and 5bit of Tables 2, 3, 4, and 5 representing SRS bandwidths (BW). Can be expressed. Among the two parameters, C _SRS is a cell-specific parameter and B _SRS is a UE-specific parameter. In the case of using the C _SRS (3bit), B _SRS (2bit), and 5bit of Tables 2, 3, 4, and 5 representing the starting point information and the bandwidth consisting of 5bits, a total of 10bits of each of the 510 of FIG. Can be set as information of the A-SRS index. However, among the starting point information (5 bits) and C _SRS (3 bits) and B _SRS (2 bits), a cell-specific parameter C _SRS is information that all user terminals already possess. Therefore, when the C _SRS is excluded, the start point 5 bits and the B _SRS 2 bits may be configured and set as information on the SRS bandwidth. That is, at least one of information about the start point of the bandwidth to which the aperiodic reference signal is transmitted and the size of the bandwidth may be set as information indicating transmission of the aperiodic reference signal included in 510 of FIG. 5.

As shown in FIG. 5, 520 indicates holding of a periodic reference signal. Therefore, information about which user terminal each holding index indicates may be shared between the base station and the user terminal.

4 shows an example in which reference signal transmission control information is configured to transmit an aperiodic reference signal as shown in 412 and 414 of FIG. 4. In order to indicate specific information, '1' or '0' is shown as an embodiment, and may be configured differently according to the implementation of the system. The reference signal transmission control information in FIG. 7 includes information necessary for transmitting the aperiodic reference signal and information indicating whether the periodic reference signal is held. In addition, in FIG. 7, the length of the reference signal transmission control information is the same as that of DCI 3 / 3A, but the user terminal can decode the ASRS-RNTI to distinguish it. This has the advantage of not increasing the decoding level as described below.

701 is reference signal transmission control information indicating to transmit the aperiodic reference signal at the 402 subframe transmission time point in FIG. 4. 402 is transmitted before the time of subframe transmission to allow the user terminal to determine in advance whether to transmit the reference signal.

As shown in 402 to 412 of FIG. 4, the UE1 transmits an aperiodic reference signal and the remaining

UEs

2, 3, 4, and 5 hold so as not to transmit a reference signal such as 422. In 720 of FIG. 7, N, which is the maximum index, may be determined as a size that does not increase the existing blind decoding level. Of course, the size of N can be increased even if the blind decoding level is increased depending on the situation. However, in the embodiment of FIG. 7, the size is the same as that of the existing DCI format 3 / 3A, and does not exceed 32 bits except ASRS-RNTI. To give an index.

As described above, at time 402 of FIG. 4, UE1 transmits an aperiodic reference signal with respect to the entire bandwidth as shown in 412. Accordingly, aperiodic reference signal transmission indication information 711 for UE 1 is set. In order to indicate holding of the periodic reference signals of the other

user terminals UE

2, 3, 4, and 5, it is indicated to hold the periodic reference signals by setting '1' as 722, 723, 724, and 725, respectively. It can be set to. 710 includes one or more aperiodic reference signal transmission indication information, and 720 includes periodic reference signal holding indication information. 710 is an embodiment of the A-SRS indication index described above, and 720 is an embodiment of the holding indication index. 721 may be set to '0'. Before receiving the reference signal transmission control information such as 701, UE1 is instructed to transmit the aperiodic reference signal. Therefore, the ASRS-RNTI decodes 730 to confirm that 701 is the reference signal transmission control information. If it is confirmed that is not held at, the information necessary to transmit the aperiodic reference signal is extracted from the pre-appointed index 711, and the aperiodic SRS may be transmitted at 402, which is a previously promised time point.

Meanwhile, except for UE 1,

UEs

2, 3, 4, and 5 decode 701 to ASRS-RNTI to identify 730 as reference signal transmission control information, and as shown in 722, 723, 724, and 725, respectively, in the index assigned to them. It is confirmed to hold so as not to transmit the periodic reference signal at 402, which is a predetermined time point.

751 of FIG. 7 also indicates that UE3, the user terminal, transmits the aperiodic reference signal at time 405 of FIG. 4 and indicates that the other

user terminals UE

1, 2, 4, and 5 hold the periodic reference signal (771). 772, 774, and 775 are reference signal transmission control information. Unlike 701, the positions of the aperiodic reference signal transmission indication information 760 and the periodic reference signal holding indication information 770 are changed. These locations may vary depending on the implementation process. The index for providing A-SRS information such as 711 and 761 in FIG. 7 may be previously received by the user terminal. 770 is an embodiment of the holding indication index described above, and 760 is an embodiment of the A-SRS indication index.

8 is a diagram illustrating an example of assigning an index to receive a holding signaling according to an embodiment of the present specification. FIG. 8 illustrates a case in which one index is used without distinguishing between a holding indication index or an A-SRS indication index, unlike FIGS. 5 and 7.

810 is a table illustrating an example of assigning an index of an area where each user terminal receives a holding signaling. When the number of user terminals in a cell is 10, the base station transmits an index necessary for a new DCI format for providing reference signal transmission control information such as FIG. 5 or 7 to each user terminal through signaling. At this time, the index 0 to K of the field indicating information necessary for the transmission of the aperiodic reference signal are not allocated. Therefore, the user terminals are given one of the indices from K + 1 to N. Therefore, before the aperiodic reference signal is triggered, the user terminals in the cell already have index information on a holding signaling field to receive a holding signal of a new DCI format. When the base station triggers the aperiodic reference signal to a specific user terminal, it is transmitted through the PDCCH, and at this time, an index of 0 to K is given to the user terminal that will transmit the aperiodic reference signal.

Before signaling to send aperiodic reference signal to UE 1, user terminals UE 1 to 10 in the cell are given indices of K + 1 to K + 10 as shown in 810. At this time, since the aperiodic reference signal is triggered, UE1 is also given an index K + 1 for holding. However, when the base station triggers the aperiodic reference signal to the UE1, the base station assigns index 0 using a specific format of the PDCCH. In this case, the specific format may be an UL grant or may be one of a DL grant. In addition, N bit may be used as information for transmitting the aperiodic reference signal, and may include not only information for triggering but also other information required for transmitting the aperiodic reference signal. When the UE receives index 0 while the aperiodic reference signal is triggered, when a new DCI format such as 820 of FIG. 8 is received, the user terminal receives a non-periodic reference other than the previously allocated index 825 of K + 1. When the signal is triggered, information necessary for the transmission of the aperiodic reference signal is obtained by using the index 0 received together. The field indicated by index 0 includes information for transmitting an aperiodic reference signal.

Meanwhile, the user terminals that need to hold the rest include holding information in a field of an index allocated to them, and thus, UE1 holds in a subframe in which the aperiodic reference signal is transmitted. The collision with the reference signal can be avoided. Index allocation, such as 810 of FIG. 8, may vary according to network conditions, such as configuration of a system and a user terminal. For example, if there are UE 1, UE 2, UE 3, UE 4, UE 5, the indexes may be assigned to K + 1, K + 3, K + 5, K + 7 and K + 9, respectively, in reverse order. Alternatively, K + 5, K + 4, K + 3, K + 2, and K + 1 may be assigned (K is an integer of 0 or more).

FIG. 9 is a diagram illustrating an example of assigning an index for receiving holding signaling according to another embodiment of the present specification. The index in FIG. 9 is a method of providing an index to efficiently provide holding signaling to a plurality of user terminals.

As described in Table 1 above, there may be a user terminal that does not transmit the periodic reference signal in the same subframe. For example, the user terminal assigned srcSubframeConfiguration of Table 1 to 7 and the user terminal assigned to 8 transmit aperiodic SRS in the {0, 1} th subframe and the {2, 3} th subframe, respectively. In this case, the holding indication information of the periodic reference signal may be superimposed and allocated. This includes superimposing the indices for the user terminals that do not need to receive the holding instruction of the periodic reference signal according to the length of the limited reference signal transmission control information. 910 is set to send a periodic reference signal in the subframe {0, 1}

UE

1, 2, 3 and

UE

4, 5, 6 is set to send a periodic reference signal in the {2, 3} subframe Allocate indexes K + 1, K + 2, K + 3 for holding signaling for 1, 2, 3, and indexes K + 1, K + 2, K + for holding signaling for

UEs

4, 5, 6 3 was allocated. UE 1 and UE 4 may use the same index because they do not transmit a periodic reference signal at the same time.

In the reference signal transmission control instruction information such as 920, 925, which indicates a holding portion, is set to indexes K + 1 to N. Holding signaling may be provided for

UEs

1, 2, and 3 to indicate transmitting aperiodic SRS in the 0, 1st subframe. In addition, holding signaling may be provided for

UEs

4, 5, and 6 to indicate transmitting aperiodic SRS in the second and third subframes.

FIG. 10 is a diagram illustrating a process of triggering an aperiodic reference signal and providing a holding signal using a new DCI format in a base station according to one embodiment of the present specification. 10 shows a process performed in the base station.

First, the base station allocates an index necessary for holding to each user terminal through signaling (S1010). Index allocation is the same as 810 of FIG. 8 and 910 of FIG. 9. The base station determines to transmit the aperiodic reference signal to the UE_A (S1020). Thereafter, the base station determines a frequency band in which UE_A can transmit an aperiodic reference signal (S1030). As described above with reference to FIG. 6, a starting point and a bandwidth can be determined, which includes determining a starting point of 5 bits and 2 bits of a B _SRS . The base station configures a DCI format including reference signal transmission control information (S1040). 500 of FIG. 5 or 701, 751 of FIG. 7, 820 of FIG. 8, and 920 of FIG. 9 are examples of DCI formats including reference signal transmission control information. The base station transmits index 0 to be used for the reference signal transmission control information to the UE_A (S1050). Index 0 means the index of the information indicating the aperiodic reference signal transmission from the above-described reference signal transmission control information. The base station transmits a DCI format capable of triggering an aperiodic reference signal to the UE_A (S1060). As a result, UE_A recognizes that it will transmit an aperiodic reference signal. The DCI format including the reference signal transmission control information is transmitted to the UE_A and the UE (holding UE except UE_A) that need to be held (S1070). After a predetermined time after receiving the reference signal transmission control information, for example, after a time of 4 subframes or 8 subframes, aperiodic reference signal transmitted by UE_A is received. The user terminal instructed to hold at this point holds the transmission of the periodic reference signal.

FIG. 11 is a diagram illustrating a process in which user terminals receive reference signal transmission control information from a base station according to one embodiment of the present specification. User terminal 1 1102 is a user terminal to transmit an aperiodic reference signal, and user terminal 2 1103 is a user terminal to hold a periodic reference signal. Although not shown in the drawing, there may be a plurality of user terminals operating in the same manner as the user terminal 2 1103.

First, the base station provides a DCI format index containing information necessary for holding (S1110). The user terminal 1 1102 and the user terminal 2 1103 that have received the DCI format are assigned a DCI format index (S1112, S1114).

The user terminal 1 transmits a buffer status report to the base station (S1120). The base station transmits an aperiodic reference signal triggering message and an index necessary for aperiodic reference signal transmission to the user terminal 1 1102 (S1130). As a result, the user terminal 1 1102 replaces the previously allocated index with the index assigned in S1130 (S1140). The index means an index in the information indicating the aperiodic reference signal transmission among the above-described reference signal transmission control information. The base station transmits a DCI format including reference signal transmission control information (S1150). This is received by user terminal 1 1102 and user terminal 2 1103. The user terminal 1 1102 may extract information necessary for transmitting the aperiodic reference signal from the reference signal transmission control information using the index information received in S1130. Thereafter, after the K subframe passes, the user terminal 1 1102 transmits an aperiodic reference signal (S1160). In operation S1165, the user terminal 2 1103 stops holding, that is, transmitting the periodic reference signal.

12 is a diagram illustrating a process of receiving a non-periodic reference signal by a channel measurement reference signal receiving apparatus according to one embodiment of the present specification. The reference signal receiving apparatus for measuring a channel in the figure may be a base station or a component of a base station, a relay, or a component of a relay, and the like. The reference signal for channel measurement includes the aperiodic SRS described above. First, the apparatus for receiving a channel measurement reference signal determines one or more first user terminals to which the aperiodic channel estimation reference signal is to be transmitted (S1210). In operation S1220, the at least one first user terminal determines a second user terminal which is supposed to transmit the periodic channel estimation reference signal in a frequency and time domain to which the aperiodic channel estimation reference signal is to be transmitted. Subsequently, the apparatus for receiving a reference signal for measuring a channel may include first indication information indicating transmission of a reference signal for aperiodic channel estimation of a first user terminal and a second indication indicating interruption of transmission of a reference signal for periodic channel estimation of a second user terminal. Reference signal transmission control information in which the information is combined is transmitted (S1230). In the reference signal transmission control information, the first indication information and the second indication information may be set at a predetermined position. In addition, the reference signal transmission control information may have the same length as PDCCH DCI format 3 / 3A. The first indication information includes at least one of a start point and bandwidth information of an aperiodic channel estimation reference signal to be transmitted by the first user terminal. The reference signal transmission control information may be generated by coding the information including the first indication information and the second indication information with a reference signal transmission control information generation code. This has been described with reference to the drawings and the description with the ASRS-RNTI as an embodiment. In operation S1240, a reference signal for aperiodic channel estimation transmitted by the first user terminal is received. In this case, the aperiodic channel estimation reference signal may be received from the first user terminal after a predetermined time interval after transmitting the reference signal transmission control information.

The apparatus for transmitting a reference signal for measuring a channel of FIG. 13 may be a user terminal or an apparatus attached to the user terminal. The apparatus for measuring a channel measurement reference signal receives information for triggering transmission of the reference signal for measuring aperiodic channel from the apparatus for measuring a channel measurement (S1310). In operation S1320, reference signal transmission control information is received from the reference signal receiving apparatus for measuring a channel. The reference signal transmission control information may include at least one of a start point and bandwidth information of the aperiodic channel estimation reference signal to be transmitted by the channel measurement reference signal transmission apparatus. The reference signal transmission control information may have a length equal to that of the PDCCH DCI format 3 / 3A. The reference signal transmission control information generation code may be decoded into a reference signal transmission control information generation code. When the reference signal transmission control information has the same length as the PDCCH DCI format 3 / 3A, the reference signal transmission control information generation code If decoding is possible using, it can be confirmed that the reference signal transmission control information. This has been described above with ASRS-RNTI as an embodiment. Subsequently, instruction information indicating a reference signal transmission for aperiodic channel measurement is calculated from the reference signal transmission control information, and a reference signal for aperiodic channel measurement is transmitted according to the indication information (S1330). In this case, after receiving the reference signal transmission control information, the aperiodic channel measurement reference signal may be transmitted after a predetermined time interval.

Meanwhile, the case of holding the periodic reference signal is as follows. Receiving reference signal transmission control information from a channel measurement reference signal receiving apparatus, calculating indication information indicating that the reference signal transmission for periodic channel measurement is stopped from the reference signal transmission control information, and according to the indication information, the reference for periodic channel measurement The transmission of the signal can be stopped. In addition, in the transmission of the reference signal for periodic channel measurement, the transmission of the reference signal for periodic channel measurement may be stopped after a predetermined time interval after receiving the reference signal transmission control information.

14 is a diagram illustrating a configuration of a reference signal receiving apparatus for measuring a channel according to an embodiment of the present specification. 14 may be a base station, a relay, or a device that is a component thereof.

Looking at the overall configuration, it is composed of a determination unit 1410, a control information generation unit 1420, a coding unit 1430, a transceiver 1440.

The determination unit 1410 may include at least one first user terminal through which the channel measurement reference signal receiving apparatus transmits a reference signal for aperiodic channel estimation, and the at least one first user terminal by using the aperiodic channel estimation reference signal. It is determined that the second user terminal is scheduled to transmit the reference signal for periodic channel estimation in duplicate in the frequency and time domain to be transmitted.

The control information generator 1420 is configured to indicate first instruction information for instructing aperiodic channel estimation reference signal transmission of the first user terminal and a second instruction for interrupting transmission of the reference signal for periodic channel estimation of the second user terminal. Reference signal transmission control information combined with the information is generated. In the reference signal transmission control information, the first indication information and the second indication information may be set at a predetermined position. The first indication information may include at least one of a start point and bandwidth information of an aperiodic channel estimation reference signal to be transmitted by the first user terminal. In addition, the reference signal transmission control information may have the same length as PDCCH DCI format 3 / 3A.

The coding unit 1430 includes the control information in a physical control channel to generate a radio signal. In this case, the information including the first indication information and the second indication information may be coded by a reference signal transmission control information generation code, and more specifically, the ASRS-RNTI may be coded according to an embodiment. The transceiver 1440 transmits the radio signal to the first user terminal and the second user terminal, and receives the aperiodic channel estimation reference signal transmitted by the first user terminal. In this case, the transceiver 1440 may receive a reference signal for aperiodic channel estimation from the first user terminal after a predetermined time interval after transmitting the reference signal transmission control information.

15 is a diagram illustrating a configuration of a reference signal transmission apparatus for measuring a channel according to an embodiment of the present specification. The reference signal transmission apparatus for measuring a channel may be a user terminal or a device attached to the user terminal. The overall configuration includes a controller 1510, a reference signal generator 1520 for measuring a channel, and a transceiver 1530. Looking in more detail as follows.

The transceiver 1530 transmits and receives a signal with a reference signal receiving apparatus for measuring a channel. The channel measurement reference signal generator 1520 generates a channel measurement reference signal. It includes a channel measurement reference signal that can be transmitted periodically or aperiodically. The controller 1510 receives information for triggering the transmission of the aperiodic channel measurement reference signal received by the transceiver 1530 from the channel measurement reference signal receiving device, and from the channel measurement reference signal receiving device. In the case of receiving the reference signal transmission control information, the reference signal transmission control information calculates the instruction information indicating the transmission of the reference signal for aperiodic channel measurement, and the transceiver unit transmits the reference signal for the aperiodic channel measurement according to the indication information. The channel measurement reference signal generator 1520 and the transceiver 1530 are controlled. The reference signal transmission control information includes at least one of a start point or bandwidth information of an aperiodic channel estimation reference signal to be transmitted by the channel measurement reference signal transmission apparatus, and the reference signal transmission control information is a PDCCH DCI. It may have the same length as format 3 / 3A.

In addition, the controller 1510 may control the transceiver 1530 to transmit the aperiodic channel measurement reference signal after a predetermined time interval after the transceiver receives the reference signal transmission control information. . In addition, the controller 1510 may decode the reference signal transmission control information into a reference signal transmission control information generation code. More specifically, the controller 1510 may decode the ASRS-RNTI as an embodiment.

It is also possible to hold the transmission of the reference signal. That is, the transceiver 1530 receives reference signal transmission control information from the channel measurement reference signal receiving apparatus, and the controller 1510 instructs to stop transmission of the reference signal for periodic channel measurement in the reference signal transmission control information. The transceiver 1530 may be controlled to calculate indication information and stop transmission of a reference signal for periodic channel measurement according to the indication information. In this case, the controller 1510 may control the transceiver 1530 to stop transmission of the periodic channel measurement reference signal after a predetermined time interval after receiving the reference signal transmission control information.

According to an embodiment of the present disclosure, when using SRS, which is a channel sounding technique applied to LTE or LTE-A, aperiodically, it may signal to effectively use aperiodic SRS. That is, when transmitting the aperiodic SRS in a wide band, a phenomenon may occur in which a frequency band overlaps with other user terminals previously transmitting the periodic SRS. To this end, it is possible to hold the periodic SRS to another user terminal using the periodic SRS. At this time, the user terminal transmitting the aperiodic SRS using the DCI format 3 / 3A format transmits information indicating the area of the frequency band and performs the holding. The holding information can be transmitted to the user terminal that should be. This information is transmitted at the same time to enable effective and fast aperiodic transmission of SRS.

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

Claims

The first indication information for instructing the channel measurement reference signal receiving unit to transmit the reference signal for aperiodic channel estimation of the first user terminal, and the second indication information for instructing to stop transmitting the reference signal for periodic channel estimation of the second user terminal. Transmitting the reference signal transmission control information combining the; And

Receiving a reference signal for aperiodic channel estimation transmitted by the first user terminal,

The second user terminal is intended to transmit a periodic channel estimation reference signal in a frequency and time domain in which the first user terminal transmits the aperiodic channel estimation reference signal. How to receive a reference signal.
The method of claim 1,

And the first indication information and the second indication information are set in a predetermined position in the reference signal transmission control information.
The method of claim 1,

And the first indication information comprises at least one of a start point and bandwidth information of a reference signal for aperiodic channel estimation to be transmitted by the first user terminal.
The method of claim 1,

The step of transmitting the reference signal transmission control information

Receiving the reference signal for aperiodic channel measurement, further comprising generating the reference signal transmission control information by coding the information including the first indication information and the second indication information into a reference signal transmission control information generation code. How to.
The method of claim 1,

And the reference signal transmission control information has the same length as PDCCH DCI format 3 / 3A.
Receiving, by the channel measuring reference signal transmitting apparatus, information for triggering transmission of the aperiodic channel measuring reference signal from the channel measuring reference signal receiving apparatus;

Receiving reference signal transmission control information including at least one of a start point and bandwidth information of an aperiodic channel estimation reference signal to be transmitted by the channel measurement reference signal transmission device from the channel measurement reference signal receiving device; And

Calculate the indication information indicating the reference signal transmission for aperiodic channel measurement from the reference signal transmission control information and measure the aperiodic channel according to the indication information after a predetermined time interval after reception of the received reference signal transmission control information. Transmitting a reference signal for aperiodic channel measurement.
The method of claim 6,

Receiving the reference signal transmission control information

And decoding the reference signal transmission control information into a reference signal transmission control information generation code.
The method of claim 6,

And the reference signal transmission control information has a length equal to that of PDCCH DCI format 3 / 3A.
The method of claim 6,

Receiving reference signal transmission control information from a channel measurement reference signal receiving apparatus; And

Comprising the step of calculating the reference information indicating to stop the transmission of the reference signal for the periodic channel measurement from the reference signal transmission control information, and stopping the transmission of the reference signal for periodic channel measurement according to the indication information, for aperiodic channel measurement Method of transmitting a reference signal.
The method of claim 9,

The step of stopping transmission of the reference signal for periodic channel measurement

And stopping the transmission of the reference signal for periodic channel measurement after a predetermined time interval after the receiving of the reference signal transmission control information.
At least one first user terminal to which the reference signal reception apparatus for channel measurement is to transmit the reference signal for aperiodic channel estimation and at least one frequency and time domain for the at least one first user terminal to transmit the reference signal for aperiodic channel estimation. A determination unit which determines a second user terminal which is supposed to transmit the reference channel for periodic channel estimation in duplicate;

Reference signal transmission control information combining first indication information indicating transmission of aperiodic channel estimation reference signal by the first user terminal and second indication information indicating interruption of transmission of the reference signal for periodic channel estimation of the second user terminal. Control information generation unit for generating a; And

A coding unit including the control information in a physical control channel to generate a radio signal; And a transceiver configured to transmit the radio signal to the first user terminal and the second user terminal, and to receive the aperiodic channel estimation reference signal transmitted by the first user terminal. Receiving device.
The method of claim 11,

And the first indication information and the second indication information are set in a predetermined position in the reference signal transmission control information.
The method of claim 11,

The transmitter / receiver receives aperiodic channel estimation reference signals from the first user terminal after a predetermined time interval after transmitting the reference signal transmission control information. .
The method of claim 11,

And the first indication information includes at least one of a start point and bandwidth information of a reference signal for aperiodic channel estimation to be transmitted by the first user terminal.
The method of claim 11,

And the coding unit codes the information including the first indication information and the second indication information into a reference signal transmission control information generation code.
The method of claim 11,

And the reference signal transmission control information has the same length as PDCCH DCI format 3 / 3A.
A transceiver for transmitting and receiving a signal to and from a reference signal receiving apparatus for measuring a channel;

A channel measurement reference signal generator for generating a channel measurement reference signal; And

The transmitter / receiver receives information for triggering transmission of the aperiodic channel measurement reference signal received from the channel measurement reference signal receiving apparatus, and a starting point of the aperiodic channel estimation reference signal from the channel measuring reference signal receiving apparatus; When receiving the reference signal transmission control information including at least one of the bandwidth information, the indication information indicating the reference signal transmission for aperiodic channel measurement is calculated from the reference signal transmission control information to determine the received reference signal transmission control information. And a control unit controlling the channel measurement reference signal generator and the transceiver to transmit and receive the aperiodic channel measurement reference signal according to the indication information after a predetermined time interval after reception, for aperiodic channel measurement. Reference signal transmission device.
The method of claim 17,

And the control unit decodes the reference signal transmission control information into a reference signal transmission control information generation code.
The method of claim 17,

And the reference signal transmission control information has the same length as PDCCH DCI format 3 / 3A.
The method of claim 17,

The transceiver receives reference signal transmission control information from a channel measurement reference signal receiving apparatus,

The control unit calculates the instruction information instructing to stop transmission of the reference signal for periodic channel measurement from the reference signal transmission control information and controls the transceiver to stop transmission of the reference signal for periodic channel measurement according to the indication information. Reference signal transmitter for channel measurement.
The method of claim 17,

The control unit controls the transmission and reception unit to stop transmitting the reference signal for periodic channel measurement after a predetermined time interval after receiving the reference signal transmission control information. Transmitting device.