KR20120000482A - Method and apparatus for transmitting and receiving resource allocation and period information for aperiodic transmission of sounding reference signal - Google Patents

Abstract

A method and apparatus for transmitting and receiving resource allocation and period information for aperiodic transmission of a sounding reference signal.
According to an embodiment of the present disclosure, a method of transmitting resource allocation and period information for aperiodic transmission of a sounding reference signal may be performed by a base station of the aperiodic sounding reference signal to a user terminal to which the aperiodic sounding reference signal is to be transmitted. Determining a resource and a period to be allocated to the transmission, transmitting the indication information on the determined resource and the period by using a physical control channel, and after the transmission of the physical control channel, the user terminal determines the determined resource in the determined resource. Receiving an aperiodic sounding reference signal that transmits by repeating the period.

Description

Method and apparatus for transmitting and receiving resource allocation and periodic information for aperiodic transmission of a sounding reference signal {Method and Apparatus for Transmitting and Receiving Resource Allocation and Periodicity Information for Transmission of Aperiodic Sounding Reference Signal}

The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving resource allocation information and period information for controlling aperiodic transmission of a control signal for estimating a resource state in an OFDMA wireless communication system. It is.

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, various current communication systems use various control signals to provide information on a communication environment, etc. to the counterpart device through uplink or downlink, and reference signals are used as an example of the control signal.

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

On the other hand, the reference signals for channel estimation, etc. are periodically generated by the base station apparatus for transmitting the reference signal, that is, the UE in the case of the uplink reference signal, and the base station apparatus in the case of the downlink reference signal. It is common to transmit.

Recently, however, a discussion has been made to transmit a channel estimation reference signal aperiodically due to flexibility of a communication system, but a specific method thereof 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 resource allocation information for aperiodic transmission of a sounding reference signal.

In addition, an embodiment of the present disclosure provides a technique for aperiodic transmission of a sounding reference signal for estimating a channel state of a terminal in a communication system.

In addition, an embodiment of the present disclosure provides a transmission technique for minimizing a collision with another reference signal by enabling a multi-shot to transmit a sounding reference signal aperiodically in a communication system.

In addition, an embodiment of the present disclosure provides a technique for signaling allocation information and period information of an aperiodic sounding reference signal to transmit a multi-shot aperiodic sounding reference signal in an empty resource space in a communication system. To provide.

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

In addition, an embodiment of the present disclosure controls to transmit the aperiodic sounding reference signal with a predetermined period for a predetermined period of time, thereby minimizing the number of times of transmitting information controlling the transmission of the aperiodic sounding reference signal. Provide technology.

According to an embodiment of the present disclosure, a method of transmitting resource allocation and period information for aperiodic transmission of a sounding reference signal may be performed by a base station of the aperiodic sounding reference signal to a user terminal to which the aperiodic sounding reference signal is to be transmitted. Determining a resource and a period to be allocated to the transmission, transmitting the indication information on the determined resource and the period by using a physical control channel, and after the transmission of the physical control channel, the user terminal determines the determined resource in the determined resource. Receiving an aperiodic sounding reference signal that transmits by repeating the period.

According to another embodiment of the present disclosure, a method for receiving resource allocation and period information for aperiodic transmission of a sounding reference signal may include receiving, by a user terminal, a physical control channel from a base station, and receiving the information of the received physical control channel. Checking whether information indicating the resource and the period to be allocated to the transmission of the aperiodic sounding reference signal is indication information; when the information of the control channel is the indication information, transmitting the aperiodic sounding reference signal using the indication information Calculating a resource and a period to be performed, and repeatedly transmitting the aperiodic sounding reference signal with the period in the resource.

In another embodiment of the present disclosure, an apparatus for transmitting resource allocation and period information for aperiodic transmission of a sounding reference signal may be performed by a base station to a user terminal to which the aperiodic sounding reference signal is to be transmitted. A determination unit for determining a resource and a period to be allocated to the transmission of the signal, an indication information generation unit for generating indication information indicating the indication information on the determined resource and the period, and including the indication information in a physical control channel to generate a radio signal And a transmitting / receiving unit for transmitting the radio signal to the user terminal and receiving an aperiodic sounding reference signal transmitted by the user terminal by repeating the determined period in the determined resource.

An apparatus for receiving resource allocation and period information for aperiodic transmission of a sounding reference signal according to another embodiment of the present specification receives a radio signal including a physical control channel from a base station and transmits and receives a sounding reference signal. The controller determines whether the received information of the physical control channel is indication information indicating a resource and a period to be allocated to the transmission of an aperiodic sounding reference signal and uses the indication information when the information of the control channel is the indication information. A signal transmission control unit for calculating a resource and a period for transmitting the aperiodic sounding reference signal, and a sounding reference signal generator for generating an aperiodic sounding reference signal according to the period from the resource calculated by the signal transmission control unit do.

According to another embodiment of the present disclosure, a method of transmitting a sounding reference signal includes a method of transmitting a sounding reference signal (SRS) by a terminal in a wireless communication system, and transmitting data of a physical downlink control channel (PDCCH). Checking a code point represented by bits of a resource allocation field for checking; checking whether a value of the checked code point is out of an indication information range for resource allocation determined according to a preset bandwidth; and When the value of the point is out of the indication information range, checking information on a start point for transmitting the SRS and SRS transmission period information through bits and filler bits representing a value of the code point; And transmitting the SRS according to the identified information.

According to another embodiment of the present disclosure, a method of transmitting a sounding reference signal includes receiving downlink control information from a base station including a mode switch indicating a mode in which a configuration parameter relating to an aperiodic sounding reference signal is transmitted. Determining an interpretation method of the downlink control information based on the mode switch, interpreting the downlink control information according to the determined analysis method, and based on the analyzed downlink control information to the base station; Performing uplink transmission for the. The mode switch indicates whether the configuration parameter is transmitted by being included in the downlink control information or by higher layer signaling.

In another embodiment of the present disclosure, a method of receiving a sounding reference signal includes transmitting downlink control information including a mode switch indicating a mode in which a configuration parameter relating to an aperiodic sounding reference signal is transmitted to a terminal. Transmitting the configuration parameter, and receiving an uplink signal generated based on the configuration parameter from the terminal. The mode switch indicates whether the configuration parameter is transmitted by being included in the downlink control information or by higher layer signaling.

An apparatus for transmitting a sounding reference signal according to another embodiment of the present specification includes a receiver for receiving downlink control information from a base station including a mode switch indicating a mode in which a configuration parameter related to an aperiodic sounding reference signal is transmitted. A decision unit for determining the method of interpreting the downlink control information based on the mode switch, and determining the method for interpreting the downlink control information according to the determined method, and the base station based on the analyzed downlink control information. It includes a transmitter for performing uplink transmission. The mode switch indicates whether the configuration parameter is transmitted by being included in the downlink control information or by higher layer signaling.

An apparatus for receiving a sounding reference signal according to another embodiment of the present disclosure includes a downlink control information and a mode switch indicating a mode in which a setting parameter relating to an aperiodic sounding reference signal is transmitted. And a receiver configured to receive an uplink signal generated based on the configuration parameter from the terminal. The mode switch may indicate whether the configuration parameter is transmitted by being included in the downlink control information or by higher layer signaling.

If the flag for distinguishing DCI format 0 / 1A is used to distinguish the configuration parameter transmission mode of aperiodic SRS, there is no restriction on uplink transmission that occurs by using the code point for DCI format 0 and the performance degradation does not occur. There is an advantage.

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 applicable to an embodiment of the present invention, and a general structure of a time-slot according to an embodiment of the present invention.
3 illustrates an example of periodic SRS transmission in a communication system to which the present embodiment can be applied.
4 illustrates an empty resource occurring in a periodic SRS.
FIG. 5 shows an example of transmitting an SRS in a multi-shot using an empty resource generated within the periodic SRS configuration of FIG. 4.
6 is a diagram illustrating a content allocation of an SRS resource by using the aforementioned information.
7 is a diagram illustrating an example in which an SRS resource is determined according to periodicity according to an embodiment of the present specification.
8 is a diagram illustrating an example of a format for indicating SRS resource allocation in PDCCH format 0 according to an embodiment of the present specification.
9 is a diagram illustrating an example of a format for indicating SRS resource allocation in PDCCH format 0 according to another embodiment of the present specification.
10 shows an example of an aperiodic SRS resource allocation according to an embodiment of the present specification.
11 shows an example of an aperiodic SRS resource allocation according to another embodiment of the present specification.
12 is a diagram illustrating an example of a format for indicating SRS resource allocation in PDCCH format 0 according to another embodiment of the present specification.
FIG. 13 is a diagram illustrating an example of a format for indicating SRS resource allocation in PDCCH format 0 according to another embodiment of the present specification.
FIG. 14 is a diagram illustrating a process of transmitting resource allocation and period information for aperiodic transmission of a sounding reference signal to a user terminal by a base station according to one embodiment of the present specification.
FIG. 15 is a diagram illustrating a process in which a user terminal receives resource allocation and period information for aperiodic transmission of a sounding reference signal according to one embodiment of the present specification.
FIG. 16 illustrates an apparatus for transmitting resource allocation and period information for aperiodic transmission of a sounding reference signal according to an embodiment of the present specification.
FIG. 17 illustrates a configuration of an apparatus for receiving resource allocation and period information for aperiodic transmission of a sounding reference signal according to an embodiment of the present specification.
FIG. 18 is a diagram illustrating indication information indicating resource allocation for periodic transmission of aperiodic SRS using format 0 of PDCCH according to an embodiment of the present specification.
FIG. 19 is a diagram illustrating indication information indicating resource allocation for periodic transmission of an aperiodic SRS using a format 0 of a PDCCH according to another embodiment of the present specification.
20 is a flowchart illustrating a method of transmitting an ASRS configuration parameter by a base station according to an embodiment of the present invention.
21 is a flowchart illustrating a method of receiving an ASRS configuration parameter by a terminal according to another embodiment of the present invention.

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 used to refer to the same components as much as possible even if displayed on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to that other component, but there may be another configuration between each component. It is to be understood that the elements may be "connected", "coupled" or "connected".

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

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 (BS). 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.

A base station 20 or a cell generally refers to a fixed station communicating with the terminal 10 and includes a Node-B, an evolved Node-B, and a Base Transceiver. May be called other terms such as 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 the 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.

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

One embodiment of the present invention is resource allocation in the fields of asynchronous wireless communication evolving into Long Term Evolution (LTE) and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving into CDMA, CDMA-2000 and UMB. Can be applied to 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. 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 the frame is 10 ms long and includes 10 TTIs.

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 (DMS) or a sounding reference signal (hereinafter referred to as 'SRS' or 'sounding reference signal') in the uplink. ) Is defined.

Meanwhile, three reference signals (RSs) are defined in downlink, a cell-specific reference signal (CRS), and an MBSFN reference signal (Multicast / Broadcast over Single Frequency Network Reference Signal; MBSFN-RS) and 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 specification, a process and method of controlling aperiodic transmission of a control signal will be described. An embodiment of the control signal will be described based on a channel estimation reference signal and a sounding reference signal (SRS), which is an embodiment of the present invention. However, the present invention is not limited to an SRS or a channel estimation reference signal. It should be understood as a concept that includes all kinds of control 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.

는 기준신호 시퀀스의 길이이고,

이고, u는 PUCCH 시퀀스 그룹번호이고, v는 베이스 시퀀스 번호이며, 싸이클릭 시프트(Cyclic Shift; CS)

이다.

는 0 내지 7 중 하나의 정수 값으로서 상위 계층에 의하여 각 UE마다 설정된다. 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 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.

Meanwhile, in transmitting the SRS, it is necessary to set the size of the bandwidth capable of transmitting the SRS. Setting information for this is shown in Table 2. Table 2 shows configuration information when 80 RB <bandwidth of the entire system <= 100 RB.

Table 2 shows SRS bandwidth (BW, BandWidth) configuration. If the bandwidth of the entire system, BW is 80 RB (Resource Block) <System BW <= 100 RB (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) is set for each UE is a 2-bit parameter. Therefore, when C _SRS = 0 and B _SRS = 1, a user of a corresponding cell may have 48 RBs of 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, which is shown in Tables 3, 4 and 5.

Table 3 shows configuration information when 6 RB <= bandwidth of the entire system <= 40 RB.

Table 4 shows configuration information when 40 RB <bandwidth of the entire system <= 60 RB.

Table 5 shows setting information when 60 RB <bandwidth of total system <= 80 RB.

Meanwhile, as the communication system evolves, the number of antennas increases, such as a multi-input multi-output antenna (MIMO), and the corresponding user, such as a cooperative multipoint Tx / Rx system (CoMP). With the emergence of communication systems that need to transmit and receive reference signals with neighbor cells as well as with serving cells that are currently performing main transmission and reception, a sufficient SRS capacitor is secured for periodic SRS transmission methods. Has become difficult, and as a result, the expansion of the SRS capacitor is needed.

That is, the communication system needs to increase the scheduling flexibility of the SRS and to improve the SRS capacitor according to the aperiodic adjustment of the SRS periodically transmitted in a predetermined format for each cell.

On the other hand, a variety of methods for transmitting such aperiodic SRS has been proposed, which is a method of sounding the entire frequency band by using resources in the empty space in addition to the periodic SRS. That is, it refers to an aperiodic one-shot SRS method that performs sounding for the entire bandwidth at one time. On the other hand, there is a non-periodic multiple-shot SRS (aperiodic multiple-shot SRS) method that completes the sounding for the entire band by performing the sounding several times using the empty space other than the periodic SRS. In addition, various methods such as SRS transmission through the DM-RS region and SRS transmission using the PUSCH region can be implemented.

4 illustrates an empty resource occurring in a periodic SRS. The vertical axis is the frequency domain and the horizontal axis is the time axis. The number in the resource is identification information of the user terminal to which the resource is assigned. 4 illustrates an empty resource 410 that occurs during the setting of the periodic SRS 420, where only one user can allocate one resource. Of course, when 16 different users transmit SRS when different CSs or different combs are applied to the same resource, the empty resources are smaller than the maximum allocated user terminals. Includes cases assigned to When a user is not allocated to a specific resource in a certain resource allocation pattern, an empty resource may appear as shown in FIG. 4.

FIG. 5 shows an example of transmitting an SRS in a multi-shot using an empty resource generated within the periodic SRS configuration of FIG. 4. In the free resource 410 region of FIG. 4, the user terminal 3 transmits a multiple-shot aperiodic SRS (SRS) as shown in 530, and sounds the bandwidth of the entire system through five transmissions. )can do. That is, when there is an empty resource that is not allocated to a user, a user who is allocated an aperiodic SRS can transmit a multi-shot aperiodic SRS by using an allocated resource of the empty space from the base station. There is an area 510 that is still not used among the areas of the empty resource 410 in FIG. 4.

The information required to set the periodic SRS includes information about the starting point of the SRS resource, C _SRS (3bit) and B _SRS (2bit), as shown in the examples of Tables 2, 3, and 4 representing the size of the SRS bandwidth, And it can be confirmed through the band size of the SRS allocated to 5 bits. Among these parameters, C _SRS (3bit) is Cell-Specific Prarameter, and B _SRS (2bit) is UE-Specific Prarameter.

6 is a diagram illustrating a content allocation of an SRS resource by using the aforementioned information. In FIG. 6, a resource for transmitting a SRS by a specific user terminal is 610. This resource specifies from which frequency point, at which bandwidth, the SRS is transmitted.

A starting point consisting of 5 bits, which indicates the starting position of an SRS resource, and uses C _SRS (3bit), B _SRS (2bit), and 5bit of Tables 2, 3, 4, and 5, which represent SRS bandwidths (BW). The allocated SRS bandwidth can be expressed. Among the two parameters, C _SRS is a cell-specific parameter and B _SRS is a UE-specific parameter.

As described above, in order to allocate an SRS resource, the user terminal receives information about 5 bits indicating a starting point through high layer signaling, and bandwidths for transmitting the SRS are shown in Tables 2 and 3 , Can be determined using the information of 4, 5. Therefore, when the user terminal to use the SRS to be transmitted in the multi-shot to the three parameters (starting point, C _SRS , B _SRS ) it is possible to indicate the resource for transmitting the SRS in the multi-shot. The three parameters (starting point, C _SRS , B _SRS ) require 5 bits, 3 bits, and 2 bits, respectively, and require a total of 10 bits.

After the start point of the SRS and the BW (C _SRS , B _SRS ) are determined as described above, the remaining SRS resources are determined by SRS periodicity and hopping pattern.

Some of the parameters necessary for setting the periodic SRS may be controlled to temporarily transmit the SRS using a predetermined empty resource. Of course, such transmission may be included in the category of aperiodic SRS and may be included in the category of temporary periodic SRS. Hereinafter, a process of transmitting aperiodic SRS by providing SRS resource allocation information and period information for transmitting the SRS in a multi-shot for a certain period, for example, one or more subframe periods, will be described.

When predicting an empty resource to transmit an aperiodic SRS (hereinafter referred to herein as an SRS that is transmitted for a predetermined period with a period shorter than a period for controlling periodic SRS transmission) as a multi-shot, the empty resources are predetermined It may consist of a pattern of. That is, by providing information about the beginning of the free resource, the user terminal can then calculate at what time and at what location the SRS can be transmitted. In an embodiment of the present specification, three parameters (starting point, C _SRS , B _SRS ) and period information (Periodicity), which are necessary information for configuring SRS resources for periodic SRS transmission, are used. The four parameters (starting point, C _SRS , B _SRS , period) are 5 bits, 3 bits, 2 bits, and 10 bits, respectively, but the period information can be reduced using only a part of 10 bits for aperiodic SRS transmission. As shown in Table 6, the information related to the transmission period and the offset information are combined. Since the offset transmits the aperiodic SRS after allocating the aperiodic SRS resource and the period, it is not necessary to provide separate offset information. That is, the amount of information may be reduced according to the degree of information sharing between the network environment and the user terminal-base station. For example, in the case of C _{SRS having} a specific value for each cell, the information obtained by the user terminal before transmitting the periodic SRS is information that is commonly used in the corresponding cell even though the BS is not informed separately. If not changed, it may not be included in the SRS resource allocation information. In addition, if the bandwidth for transmitting the aperiodic SRS is used as it is, the user terminal may calculate the B _SRS without providing it.

7 is a diagram illustrating an example in which an SRS resource is determined according to periodicity according to an embodiment of the present specification.

When the BW is set as the starting point (5bit), C _SRS (3bit), and B _SRS (2bit), the next resource is determined by the periodicity and the frequency hopping pattern. The hopping pattern may be determined using a cell-specific parameter and a subframe number. Information related to the SRS periodicity is defined by 10bit, which is shown in Table 6.

711, 712, 713, and 714 indicate resource regions for which UE 1 transmits SRS, and 721, 722 indicate resource regions for UE 2 for transmitting SRS. It can be seen that the SRS periodicity of UE1 and the SRS periodicity of UE2 are different from each other.

Table 6 shows periodicity and corresponding offset information in allocating SRS resources. In Table 6, there are 8 types of periodicity (2ms, 5ms, 10ms, 20ms, 40ms, 80ms, 160ms, 320ms). Since it is 8 types, it takes 3 bits to distinguish periodicity, but total 10bit information is needed to provide offset information for each periodicity.

가 100RB이므로, 이를 지시하는데 필요한 비트는 13bit(

)이다. 15MHz의 경우에는

가 75RB이므로 12bit, 10MHz의 경우에는

가 50RB이므로 11bit, 그리고 5MHz의 경우에는

가 15RB이므로 7bit가 필요하다. 한편 이러한 PUSCH를 이용한 자원 할당 필드가 가질 수 있는 값의 범위는 표 7의 'A'와 같으므로, 여분의 값과 필러 비트(830)를 이용하여 SRS의 자원 할당과 주기 정보를 제공할 수 있다. 8 is a diagram illustrating an example of a format for indicating SRS resource allocation in PDCCH format 0 according to an embodiment of the present specification. 8 shows a PDCCH format including an SRS positioning field. Format 0 includes information for controlling scheduling of a PUSCH. 810 is 1 bit information for distinguishing between format 0 and format 1A. Since format 0 and format 1A have the same length, a distinction is necessary. Next, A-CQI is information for requesting a channel quality indicator (CQI). If aperiodic SRS is needed using a resource allocation field using a PUSCH in the existing uplink grant format, this 820 may be used as a field for SRS positioning. The resource allocation field using the PUSCH presents information on a resource block (RB) to be allocated in the PUSCH, which varies according to bandwidth. To the resource block, so at a bandwidth of 20 MHz

Is 100 RB, so the bit required to indicate this is 13 bits (

)to be. For 15 MHz

Is 75RB, so for 12bit and 10MHz

Is 50RB, so 11bit and 5MHz

Is 15RB, so 7bit is required. On the other hand, the range of values that the resource allocation field using the PUSCH can have as shown in 'A' of Table 7, can provide the resource allocation and period information of the SRS using the extra value and the filler bit 830. .

The PDCCH format 0 used for the existing uplink allocation does not increase the PDCCH overhead, and the format 0 does not increase the blind decoding level in the process of decoding the PDCCH. Information can be indicated. 820 uses a resource allocation field (RA) of the existing PDCCH, and means using an extra value not used in the RA field to designate the SRS bandwidth.

That is, since the method of specifying the SRS bandwidth is larger than the resource unit for allocating the resource to the actual user, it is possible to indicate the bandwidth of the SRS resource with bits smaller than the bit information of the existing RA. Therefore, it is possible to specify a BW for SRS by using a code point remaining in the current format 0. For users whose resources are allocated every subframe without using the SPS, DCI format 0, which specifies the SRS BW for aperiodic SRS, comes down to prevent unnecessary increase in PDCCH. After recognizing the resource allocation for SRS, the resource allocation for data may use the resources allocated in the previous subframe. If a user is assigned SP- (Semi-statistic scheduling), the previously scheduled RA field is used as it is. However, when new scheduling is received by the ASRS, the SPS may be reset.

For example, the RA field descending to DCI format 0 in the 20 MHz (100 RB) band comes down with 13 bits information. However, since the actual code (range of indication information, A) is 0 to 5049 as shown in Table 7, remaining code points (extra range, B-A, about 11 bits) from 5050 to 8191 can be used. Since the minimum unit of BW used for SRS transmission is 4RB, it is possible to designate the BW necessary for SRS transmission sufficiently in the 100RB band with only 9 bits of information. Therefore, it is possible to express it in the remaining code point (11bit).

That is, in case of 20MHz, since the remaining code point becomes 11bit, four parameters needed to indicate SRS BW are starting point (5bit), C _SRS (3bit), B _SRS (2bit), and SRS periodicity (10bit). Not enough to express them all. However, if the UE already knows or does not need to pass parameters can be excluded. For example, C _SRS (3bit) is a cell-specific parameter, so all users in the cell share a common value. Therefore, under the same assumption for the aperiodic SRS, the C _SRS value does not need to be indicated separately. In the case of B _SRS (2bit), when transmitting the SRS by using an aperiodic SRS, the user and the B _SRS (2bit) if you want to accept the value, B _SRS (2bit) fixed to the periodic SRS to an existing You do not need to set it. That is, even if the B _SRS (2bit) value for the separate aperiodic SRS is not received, the user terminal can check the bandwidth of the aperiodic SRS using the previous value. However, the resources of the SRS that can be allocated in one subframe with the aperiodic SRS may be the same as the size of the resources of the periodic SRS, thereby lowering flexibility. However, as the flexibility decreases, the number of transmissions can be increased. On the other hand, in the case of SRS periodicity (10 bits), the periodicity (periodicity) of the non-periodic SRS can be expressed by only 3 bits as shown in Table 6. This is because, as shown in Table 6, there are only 8 types of information about 2 ms, 5 ms, 10 ms, 20 ms, 40 ms, 80 ms, 160 ms, and 320 ms. The aperiodic SRS does not need to indicate subframe offset information shown in Table 6 because the SRS can transmit the SRS at the required time using the uplink allocation format. Therefore, the periodicity required for aperiodic SRS transmission can be expressed in 3 bits.

Therefore, in order to allocate resources necessary for the transmission of the aperiodic SRS providing periodicity, it may be indicated through information (5bit) about the starting point and information (3bit) about the periodicity.

Meanwhile, in Table 7, bits that can use an extra range of the RA field at 5 MHz, 10 MHz, 15 MHz, and 20 MHz, respectively, are 7 bits, 9 bits, 10 bits, and 11 bits. However, a filler bit is present in PDCCH format 0 as shown in FIG. 8, which is used to match the sizes of PDCCH Format 0 and Format 1A. Therefore, when the RA field and the filler bit are combined for SRS positioning, the bits that can use the extra range of the RA field at 5 MHz, 10 MHz, 15 MHz, and 20 MHz, respectively, are 8 bits, 10 bits, 11 bits, and 12 bits. By setting the start point (5bit) for SRS resource allocation and the periodicity information (3bit) for the aperiodic SRS, transmission of parameters necessary for positioning of the aperiodic SRS is possible.

Such a configuration is also possible in format 1A. Format 0 and format 1A have the same RA field as the only difference in uplink downlink (UL / DL) assignments, and because the formats are the same size, format 1A, that is, DL allocation. It can also be used in formats for assignment. In addition, it is also possible to apply to other downlink assignment formats including RA fields. In addition, even if the format is used for the purpose of allocating uplink (UL) or downlink (DL) resources, it is possible to use an RA field for SRS.

9 is a diagram illustrating an example of a format for indicating SRS resource allocation in PDCCH format 0 according to another embodiment of the present specification. 9 shows an example of reconfiguring the PDCCH format defined by uplink allocation to SRS only. A "mode switch" field 910 indicating that the format is SRS only and a "number of aperiodic SRS" field 920 indicating the number of times of aperiodic SRS transmission are included. It also includes a field 930 for SRS positioning. As described above, it may include all four parameters (starting point, C _SRS , B _SRS , periodicity) necessary for allocating the resources of the aperiodic SRS, or information that the user terminal already has in the resource allocation (for example, , C _SRS , B _SRS ) may be configured only with information (starting point, periodicity) newly provided to the user terminal without separately transmitting. In addition, when the uplink allocation format is used exclusively for SRS, it is possible to transmit a parameter set that can indicate one or more SRS resources. For example, as shown in FIG. 7, each set value may be provided as one or more sets, such as 930, for SRS resources having different periodicity # 1 and periodicity # 2.

{starting point # 1, C _SRS (3bit) # 1, B _SRS (2bit) # 1, periodicity # 1,

starting point # 2, C _SRS (3bit) # 2, B _SRS (2bit) # 2, periodicity # 2,

...

}

In this case, since it is possible to allocate resources having different starting points, bandwidths, and periodicity, flexibility in transmitting aperiodic SRS is increased.

10 shows an example of an aperiodic SRS resource allocation according to an embodiment of the present specification. In FIG. 10, a multi-shot SRS is transmitted by utilizing an empty resource in a periodic SRS setting region and a resource other than the periodic SRS setting region. By utilizing a variety of resources, you can quickly sound the bandwidth of the entire system. Looking in more detail as follows. 1050 indicates a frame in which periodic SRS is set. In FIG. 10, the user equipment (user terminal 3) is configured by setting the SRS information such as start point, periodicity, and bandwidth information of the aperiodic SRS by using the aperiodic SRS resource allocation described with reference to FIGS. As a result, the UE 3 transmits an aperiodic SRS as shown in 1020 to an empty space in the periodic SRS configuration region within 1090, which is an aperiodic transmission interval. In addition, the non-periodic SRS may be transmitted as shown in 1012 and 1014 even in a space other than the periodic SRS setting region. 1032 and 1034 indicate empty resource areas. Since a resource of the SRS may be allocated using a control information channel such as a PDCCH, if the configuration information is transmitted before the 1090 interval, the aperiodic SRS may be transmitted by reflecting this in the next subframe.

11 shows an example of an aperiodic SRS resource allocation according to another embodiment of the present specification. In this case, only resources other than the periodic SRS configuration are used. In this case, collision with the existing periodic SRS can be completely avoided. In FIG. 11, the user equipment (user terminal 3) is configured by setting the SRS information such as the start point, periodicity, and bandwidth information of the aperiodic SRS using a control information channel such as PDCCH for the aperiodic SRS resource allocation described in FIGS. 8 and 9. As a result, the UE 3 transmits an aperiodic SRS such as 1112 and 1114 in an empty space in the non-periodic SRS setting region within 1190 that is a periodic period. That is, it can be seen that user terminal 3 transmits a multi-shot SRS such as 1112 and 1114 using resources of subframes other than the periodic SRS configuration 1150. Since no separate SRS is transmitted to the empty spaces 1122, 1124, 1126, and 1128 in the periodic SRS configuration, collision with the existing periodic SRS can be avoided.

10 and 11 illustrate an example of allocating an SRS resource to transmit a multi-shot aperiodic SRS in a short time and thereby transmitting an aperiodic SRS. In the LTE or LTE-A system according to an embodiment of the present specification, the excess portion of the control information is used, and when the control information uses the uplink allocation format of the PDCCH as shown in FIG. 8 or 9, the value of the SRS resource allocation Can be used.

12 is a diagram illustrating an example of a format for indicating SRS resource allocation in PDCCH format 0 according to another embodiment of the present specification. This shows a format when information on a field indicating the number of times of aperiodic SRS transmission is set to high layer signaling instead of L1 signaling. Since the value indicating the number of times of transmitting the aperiodic SRS is not changed every time the aperiodic SRS is transmitted, it is possible to set it separately by higher layer signaling. As a result, it includes a mode switch 1210 and an SRS positioning field 1220 including resource allocation information necessary for aperiodic SRS transmission. As described above, the type (parameter) of information included in the SRS positioning field may be a starting point of a bandwidth, a size of a bandwidth, a periodicity, and the like, and in some cases, the base station may transmit only some of these parameters.

FIG. 13 is a diagram illustrating an example of a format for indicating SRS resource allocation in PDCCH format 0 according to another embodiment of the present specification. Unlike in FIG. 13, the mode switch field is not set. Instead of the mode switch, a Radio Network Temporary Identifier (SRS-RNTI) may be included in the CRC field 1320 to indicate that the format is for SRS. Each user can recognize the corresponding format as an SRS-only format and decode the data value in the case of SRS-RNTI at the CRC check.

FIG. 14 is a diagram illustrating a process of transmitting resource allocation and period information for aperiodic transmission of a sounding reference signal to a user terminal by a base station according to one embodiment of the present specification. 14 is a diagram illustrating a process of providing information about a resource and a period to a user terminal so that aperiodic SRS transmission that is sounded with a predetermined period of driving period may be performed.

The base station confirms that a specific user terminal needs to transmit the SRS aperiodically during the transmission of the periodic SRS. In addition, the base station determines a resource and a period to be allocated to the transmission of the aperiodic sounding reference signal to a user terminal to transmit the aperiodic sounding reference signal (S1410). Here, the resource and the period include the radio resource to transmit the aperiodic SRS, such as the bandwidth and the starting point, and information about what interval, that is, the period to be transmitted. The radio resource becomes a resource of a starting point, and may hop according to a period later and transmit an aperiodic SRS. Such a hopping pattern may also be received by a user terminal through higher layer signaling. The indication information on the determined resource and period is transmitted using a physical control channel (S1420). The indication information includes at least one of information on a start position of the resource, information on a bandwidth of the resource, and information on an interval for transmitting the aperiodic sounding reference signal.

One embodiment of the physical control channel is the PDCCH described above, and in particular, may be transmitted through format 0 associated with uplink allocation. The format related to transmission may use the formats of FIGS. 8, 9, 12, and 13. In the case of FIG. 8, the physical control channel is a PDCCH, and the indication information is a resource and a period to be allocated for SRS transmission using a value and a filler bit in a range not used in a field for uplink resource allocation in format 0 of the PDCCH. Information can be represented. 9, 12, and 13, more aperiodic SRS allocation information may be set. In this case, information indicating a resource and a period to be allocated to the transmission of the aperiodic sounding reference signal for two or more user terminals. May be included in the indication information.

Thereafter, the aperiodic sounding reference signal is received from the user terminal allocated the resource. That is, after the transmission of the physical control channel, the user terminal receives the aperiodic sounding reference signal repeatedly transmitting the determined period in the determined resource (S1430). The resource transmitted in S1410 is related to the first aperiodic SRS transmission of the period, and the transmission of the aperiodic SRS to be transmitted next may vary according to the hopping pattern.

FIG. 15 is a diagram illustrating a process in which a user terminal receives resource allocation and period information for aperiodic transmission of a sounding reference signal according to one embodiment of the present specification. 15 is a diagram illustrating a process of transmitting an SRS by receiving information on a resource and a period so as to perform sounding with a predetermined period of driving period through the process of FIG. 15.

The user terminal receives a physical control channel from the base station (S1510). The received physical channel is decoded to determine whether the received physical control channel information is indication information indicating a resource and a period to be allocated for transmission of the aperiodic sounding reference signal (S1520). One embodiment of the physical control channel may be a PDCCH. The physical control channel is a PDCCH, and in particular, can be received through format 0 associated with uplink allocation. The format related to the transmission of the SRS may use the formats of FIGS. 8, 9, 12, and 13. In the case of FIG. 8, the physical control channel is a PDCCH, and the indication information is a resource and a period to be allocated for SRS transmission using a value and a filler bit in a range not used in a field for uplink resource allocation in format 0 of the PDCCH. Information can be represented. In this case, you can check whether it is included in the extra range. 9, 12, and 13, more aperiodic SRS allocation information may be set. In this case, information indicating a resource and a period to be allocated to the transmission of the aperiodic sounding reference signal for two or more user terminals. May be included in the indication information. The mode switch or the SRS-RNTI may be used to determine whether the corresponding PDCCH is indication information indicating a resource and a period to be allocated for transmission of the aperiodic sounding reference signal.

If the information of the control channel is the indication information, the resource and the period for transmitting the aperiodic sounding reference signal are calculated using the indication information (S1530). The indication information may include any one or more of information on a start position of the resource, information on a bandwidth of the resource, and information on an interval for transmitting the aperiodic sounding reference signal. In the case of FIG. 8, only the starting point and period information are received, and information on bandwidth may use previously received information or information received using higher layer signaling. In addition, when using the formats of FIGS. 9, 12, and 13, the indication information may include information indicating a resource and a period to be allocated for transmission of an aperiodic sounding reference signal for two or more user terminals. When the information on the radio resource of the starting point is calculated using such information, it may be calculated to transmit the aperiodic SRS at intervals according to the period information using the hopping pattern received in advance. Thereafter, the aperiodic sounding reference signal is repeatedly transmitted with the period in the resource (S1540).

 Of course, when the information on the control channel is information not related to the aperiodic SRS, the operation indicated by the corresponding physical control channel may be performed (S1550).

FIG. 16 illustrates an apparatus for transmitting resource allocation and period information for aperiodic transmission of a sounding reference signal according to an embodiment of the present specification. The configuration of FIG. 16 may be a base station or an apparatus combined with a base station. The overall configuration includes a decision unit 1610, an indication information generator 1620, a coding unit 1630, and a transceiver 1640. Of course, in addition to this, other elements may be included to provide the same function as the base station. Looking in more detail as follows.

The base station confirms that a specific user terminal needs to transmit the SRS aperiodically during the transmission of the periodic SRS. The determination unit 1610 determines a resource and a period to be allocated to the transmission of the aperiodic sounding reference signal to a user terminal to which the base station transmits the aperiodic sounding reference signal. Here, the resource and the period include the radio resource to transmit the aperiodic SRS, such as the bandwidth and the starting point, and information about what interval, that is, the period to be transmitted. The radio resource becomes a resource of a starting point, and may hop according to a period later and transmit an aperiodic SRS. Such a hopping pattern may also be received by a user terminal through higher layer signaling.

The determination unit 1610 also determines whether to include an ASRS activation field in DCI format 0. In addition, the determination unit 1610 may determine that a flag of DCI format 0 indicates a transmission mode (or configuration mode) of an ASRS configuration parameter. In this case, the flag may be called a mode switch, which will be described later.

The indication information generator 1620 generates indication information indicating indication information on the determined resource and period. The indication information includes at least one of information on a start position of the resource, information on a bandwidth of the resource, and information on an interval for transmitting the aperiodic sounding reference signal.

In addition, the indication information generator 1620 may generate an uplink grant including an ASRS configuration parameter. The uplink grant may mean DCI format 0.

The coding unit 1630 includes the indication information in a physical control channel to generate a radio signal. One embodiment of the physical control channel is the PDCCH described above, and in particular, may be transmitted through format 0 associated with uplink allocation. The format related to transmission may use the formats of FIGS. 8, 9, 12, and 13. In the case of FIG. 8, the physical control channel is a PDCCH, and the indication information is a resource and a period to be allocated for SRS transmission using a value and a filler bit in a range not used in a field for uplink resource allocation in format 0 of the PDCCH. Information can be represented. 9, 12, and 13, more aperiodic SRS allocation information may be set. In this case, information indicating a resource and a period to be allocated to the transmission of the aperiodic sounding reference signal for two or more user terminals. May be included in the indication information.

The transceiver 1640 transmits the radio signal to the user terminal, and then receives the aperiodic sounding reference signal by repeating the determined period in the determined resource from the user terminal assigned the resource. That is, after the transmission of the physical control channel, the user terminal receives the aperiodic sounding reference signal repeatedly transmitting the determined period from the determined resource. The resource indicated by the indication information generator 1620 is Related to the first aperiodic SRS transmission of a period, the transmission of the aperiodic SRS to be transmitted next may vary depending on the hopping pattern.

FIG. 17 illustrates a configuration of an apparatus for receiving resource allocation and period information for aperiodic transmission of a sounding reference signal according to an embodiment of the present specification. The apparatus of FIG. 17 may be a receiving apparatus, that is, a UE, which is a user terminal. The configuration of the apparatus may include a signal transmission controller 1710, a sounding reference signal generator 1720, and a transceiver 1730. Through the configuration of FIG. 17, the user terminal may receive information about a resource and a period so as to perform sounding with a predetermined period of time and transmit an SRS.

In more detail, the transceiver 1730 receives a radio signal including a physical control channel from the base station and transmits a sounding reference signal. In addition, the transceiver 1730 receives an uplink grant from the base station, and performs a CRC check on it. The uplink grant includes either type 1 or type 2. In addition, the type 2 uplink grant includes a 1-bit ASRS activation field and a 1-bit mode switch.

The signal transmission control unit 1710 checks whether the uplink grant is type 1 or type 2. Then, the transmission mode (or setting mode) of the ASRS configuration parameter is recognized based on the mode switch. Based on the ASRS activation field and the mode switch, it is determined whether to interpret the uplink grant in a conventional manner or in a new manner for transmission of ASRS configuration parameters.

The signal transmission controller 1710 decodes the received physical channel and checks whether the received information of the physical control channel is indication information indicating a resource and a period to be allocated to the transmission of the aperiodic sounding reference signal. When the information is the indication information, the resource and the period for transmitting the aperiodic sounding reference signal may be calculated using the indication information. One embodiment of the physical control channel may be a PDCCH. The physical control channel is a PDCCH, and in particular, can be received through format 0 associated with uplink allocation. The format related to the transmission of the SRS may use the formats of FIGS. 8, 9, 12, and 13. In the case of FIG. 8, the physical control channel is a PDCCH, and the indication information is a resource and a period to be allocated for SRS transmission using a value and a filler bit in a range not used in a field for uplink resource allocation in format 0 of the PDCCH. Information can be represented. In this case, you can check whether it is included in the extra range. 9, 12, and 13, more aperiodic SRS allocation information may be set. In this case, information indicating a resource and a period to be allocated to the transmission of the aperiodic sounding reference signal for two or more user terminals. May be included in the indication information. The mode switch or the SRS-RNTI may be used to determine whether the corresponding PDCCH is indication information indicating a resource and a period to be allocated for transmission of the aperiodic sounding reference signal. The indication information may include any one or more of information on a start position of the resource, information on a bandwidth of the resource, and information on an interval for transmitting the aperiodic sounding reference signal. In the case of FIG. 8, only the starting point and period information are received, and information on bandwidth may use previously received information or information received using higher layer signaling. In addition, when using the formats of FIGS. 9, 12, and 13, the indication information may include information indicating a resource and a period to be allocated for transmission of an aperiodic sounding reference signal for two or more user terminals. When the information on the radio resource of the starting point is calculated using such information, it may be calculated to transmit the aperiodic SRS at intervals according to the period information using the hopping pattern received in advance.

Table 8 shows the allocation of 3 bits to indicate the information on periodicity.

For 2ms, 5ms, 10ms, 20ms, 40ms, 80ms, 160ms and 320ms, periodicity can be allocated as 3 bits of information as follows. Of course, what value to assign may vary from implementation to implementation. According to Table 8, when the information related to the periodicity is received '001', when transmitting the aperiodic SRS can be transmitted with a period of 5ms.

FIG. 18 is a diagram illustrating indication information indicating resource allocation for periodic transmission of aperiodic SRS using format 0 of PDCCH according to an embodiment of the present specification. FIG. 18 shows an example in which a format 0 of a PDCCH is used as shown in FIG. 8 but a filler bit is used. In Table 6, the portion of using the extra range information of the RA field in the PDCCH format 0 was described. Table 9 shows the range of values for aperiodic SRS allocation.

In Table 7, the range of the value assigned to the RA field is smaller than the 'A range of indication information'. Therefore, when the user terminal receives the information of the PDCCH format 0 and decodes the RA field value, when the value is larger than the 'A range of the indication information', this value is recognized as a value for aperiodic SRS resource allocation. can do. For each bandwidth, the range A of the indication information may be an embodiment of a boundary value for determining whether the value is a value for RA or a value of aperiodic SRS resource allocation. This can be confirmed through Table 9.

When applying Table 9, when the user terminal receives the data of PDCCH DCI format 0, a value lower than the threshold value is information for resource allocation, and when the threshold value is higher than or equal to the threshold value, it is checked as information for aperiodic SRS resource allocation. Can be. The range of values for SRS allocation in Table 9 is one embodiment, and not all of the above values may be used for SRS resource allocation, but only some of them may be used. It can also be used to represent other information using code points. Meanwhile, in FIG. 8, the filler bit is used, and only the information on the starting point is provided, and it has been seen that the resource allocation and the period in the periodic transmission of the aperiodic SRS can be indicated in a total of 8 bits.

As described above, at least 8 bits of information may be used to allocate resources and periods for periodic transmission of the aperiodic SRS. FIG. 18 illustrates a case in which starting points (5 bits) and periodicity (3 bits) as shown in the embodiment of Table 8 are used as information for aperiodic SRS resource allocation (1850 and 1860). 1800 shows a configuration of PDCCH format 0. 1810 is indication information indicating that the PDCCH format is 0. The PDCCH format 0 and the format 1a may be distinguished through this information. 1820 becomes an RA field or an aperiodic SRS positioning field. When the value of 1820 is smaller than the boundary value shown in Table 9, it is recognized as an RA field and used as PUSCH resource allocation information. Aperiodic SRS resource allocation and periodic information by extracting 8-bit indication information, i.e., starting point (5bit) and periodicity (3bit) information, such as 1850 or 1860, combined with the filler bit through a predetermined conversion process. Can be used as For example, when the value of the 1820 region of the PDCCH format 0 information received from the base station by the user terminal in the bandwidth of 20 MHz is '3010', it is recognized as a value for RA designation, and when it is '5128' that is 5050 or more, the conversion is performed. The process may be performed, and '78', which is a value obtained by subtracting 5050 from '5128', is indication information for SRS resource allocation. Meanwhile, it is assumed that the filler bit 1830 is '1'. The result of subtracting 5050, '78' becomes '1001110' in binary, and in combination with the filler bit of FIG. 18, becomes '10011101'.

(SRS 시퀀스의 길이)를 산출할 수 있으며, 그 결과 비주기적 SRS 자원이 어느 위치에서 어떤 길이로 할당되었는지를 확인할 수 있다. 이후, 사용자 단말은 비주기적 SRS를 주기적으로 송신하기 위하여 앞서 수신한 시작점 정보와 대역폭의 정보(B_SRS, C_SRS)를 이용하여 1회 SRS를 송신한 후, 주기성 정보에서 지시한 간격(80ms)을 두고 호핑 패턴에 따라 계산된 새로운 대역폭의 시작점에서 같은 길이의 SRS를 송신할 수 있다. When allocating SRS resources and periods in the form of 1850, '10011', the value of the upper 5 bits, is the starting point for allocating the aperiodic SRS resources, and '101', the value of the lower 3 bits, is used for aperiodic SRS transmission. It is a value for judging period. Therefore, the period becomes 80 ms in accordance with Table 8. On the other hand, since the information (B _SRS , C _SRS ) of the bandwidth required for allocating the aperiodic SRS resource can use the information previously used by the user terminal as it is, using Table 2 and Equation 2

(The length of the SRS sequence) can be calculated, and as a result, it is possible to confirm whether the aperiodic SRS resource is allocated to which length at which position. Thereafter, the user terminal transmits the _SRS once using the start point information and the bandwidth information (B _SRS , C _SRS ) previously received in order to periodically transmit the aperiodic _SRS , and then an interval (80 ms) indicated by the periodicity information. In this case, SRSs of the same length may be transmitted at the start of the new bandwidth calculated according to the hopping pattern.

가 100RB이며, 13bit가 RA 필드이자 SRS 포지셔닝 필드인 1820에 할당된다. 이러한 13bit 영역은 사용자 단말에 리소스 블록을 할당하기 위한 것으로, 실제 할당되는 값의 범위는 0~5049 이다. 반면, 13bit로 표현할 수 있는 정보의 범위는 0~8191 이다. 즉, RA필드에서 사용되지 않는 값의 범위가 5050~8191 이므로, 이 값을 사용하여 SRS의 자원 할당에 적용할 수 있다. 즉, 도 18은 기존의 업링크 할당(Uplink grant)을 위해 사용되는 PDCCH 형식 0를 이용하여 PDCCH 오버헤드의 증가 없이 또한 블라인드 디코딩의 레벨(Blind decoding level)의 증가 없이 SRS 자원을 할당하는 포지셔닝 정보(SRS positioning)를 지시하는 예를 나타낸 것이다. 기존 PDCCH의 RA 필드를 이용한 것이므로, PDCCH 복호에서의 복잡도를 증가시키지 않는다.FIG. 18 is a format for indicating resources and periods of an aperiodic SRS. The length of the PDCCH format 0 / 1A is used as it is.

Is 100RB, and 13 bits are allocated to 1820, which is an RA field and an SRS positioning field. The 13-bit area is for allocating a resource block to the user terminal, and the actual range of values is 0-5049. On the other hand, the range of information that can be represented in 13 bits is 0 ~ 8191. That is, since the range of values not used in the RA field is 5050 to 8191, this value can be applied to resource allocation of the SRS. That is, FIG. 18 shows positioning information for allocating SRS resources without increasing PDCCH overhead and without increasing blind decoding level using PDCCH format 0 used for existing uplink grant. An example of indicating (SRS positioning) is shown. Since the RA field of the existing PDCCH is used, the complexity in PDCCH decoding is not increased.

In order to use the RA field as an SRS positioning field, a range of values not used in the RA field may be used. Previously, 5050 ~ 8191 is a range of unused values, which can represent about 11 bits of information. Therefore, when the size of the value in the RA field is smaller than 5050, the UE can confirm that the RA field is used. In the case of 5050 or more, the UE can map the value to a predetermined value of 11 bits and use it as information for SRS resource allocation. .

That is, since the SRS BW designation method is larger than the unit of the resource that allocates the resource to the actual user, the BW representation of the SRS resource can be expressed in bits smaller than the bit information of the existing RA. It is possible to specify a BW for the SRS using a code point. For users whose resources are allocated every subframe without using SPS (Semi Persistent Scheduling), DCI format 0, which specifies an SRS BW for aperiodic SRS to prevent unnecessary PDCCHs, is returned. After recognizing resource allocation for SRS rather than resource allocation for transmission, the resource for data may use the resources allocated in the previous subframe. For example, the RA field down to DCI format 0 in the 20 MHz (100RB) band comes down with 13 bits of information, but since only the values below 5050 are used for RA assignment, the RA field falls outside the actual RA field value (0 to 5049). If a remaining value of 5050 to 8191 (about 11 bits) is specified, this may be determined as SRS resource allocation. Since the minimum unit of BW used for SRS transmission is 4RB, it is possible to designate the BW necessary for SRS transmission sufficiently in the 100RB band with only 9 bits of information.

When 11 bits are used as indication information for allocating SRS resources, the starting points (5 bits) and periodicity (3 bits), which are parameters necessary for SRS resource allocation, can be expressed. On the other hand, in the bandwidth below 20MHz, the length of the PDCCH format 0 is reduced, in which case the filler bit 1830 may be used. That is, when the minimum information that can be provided is 8 bits, the filler bit may or may not be used depending on the available network bandwidth. As shown in Table 7, since the size of the RA field, that is, the SRS positioning field is 8 bits or more in 10 MHz, 15 MHz, and 20 MHz, the 8-bit configuration using only the filler bit at 5 MHz is not an example. Can be.

FIG. 19 is a diagram illustrating indication information indicating resource allocation for periodic transmission of an aperiodic SRS using a format 0 of a PDCCH according to another embodiment of the present specification.

Unlike FIG. 18 described above, FIG. 19 illustrates indication information that may be included in a dedicated format related to SRS resource allocation using mode switches 1911 and 1921 or CRC (SRS-RNTI, 1932).

1910 is an embodiment of FIG. 9 and illustrates a case where resource allocation and periodicity information for aperiodic SRS transmission are provided to a plurality of user terminals. The number of user terminals may be informed in an ASRS number field as shown in 1912, and information about a starting point and periodicity may be set for each user terminal as shown in 1915 as information in the 1913 field. Since only information about the starting point and periodicity is provided, each user terminal uses a range of bandwidths (B _SRS , C _SRS ) defined as transmitting the original SRS.

1920 is an embodiment of FIG. 12, and shows a case in which resource allocation and periodicity information for aperiodic SRS transmission are provided to a plurality of user terminals, and can be confirmed as a dedicated format for SRS resource allocation through a mode switch 1921. . Information included in the field 1922 may provide a starting point, B _SRS and periodicity information as shown in 1925. If the C _SRS is not provided separately as information unique to the cell, the bandwidth may be calculated by calculating the C _{SRS based on a} recognized value C _SRS .

1930 is an embodiment of FIG. 13 and shows a case in which resource allocation and periodicity information for aperiodic SRS transmission is provided to a plurality of user terminals, and as in 1932, it can be confirmed that the format is dedicated to SRS resource allocation using CRC information. have. Information included in the 1931 field may provide starting point, C _SRS , B _SRS and periodicity information as shown in 1935. Since the bandwidth can be freely set for each user terminal, aperiodic SRS transmission independent of information C _SRS and B _SRS used in the previous periodic SRS transmission is possible.

An example in which various pieces of information 1915, 1925, and 1935 are included in each format 1910, 1920, and 1930 of FIG. 19 is described. Formats and information can be used in various ways. That is, information may be stored in the format of 1930 as 1915. In this case, the number of user terminals that can be designated may increase. In addition, although the periodicity information is provided in 3 bits without the offset information for the periodicity, it is possible to provide the user terminal with certain offset information and also provide the periodicity information. In order to provide information necessary for aperiodic SRS transmission, if there are many bits that can be used as in 1931 and the bandwidth is large, the information is provided through the PDCCH once for all the user terminals, but each user terminal provides aperiodic SRS. Information about a time period to start to transmit, i.e., an offset may be separately provided as follows. Of course, the offset information may be configured differently from Table 6 according to an implementation method.

{starting point # 1, periodicity # 1, offset # 1

 starting point # 2, periodicity # 2, offset # 2

...

}

An example of DCI format 0 is shown in Table 10 below.

Referring to Table 10, a flag is an indicator for distinguishing DCI 0 from DCI 1A as 1-bit information. The hopping flag is 1-bit information and indicates whether frequency hopping is applied or not when the terminal performs uplink transmission. For example, if the hopping flag is 1, frequency hopping is applied during uplink transmission, and if hopping flag is 0, frequency hopping is not applied during uplink transmission.

DCI format 0 can be divided into type 1 and type 2. When Table 10 is referred to as Type 1, Type 2 additionally includes a 1-bit ASRS activation field. For example, if DCI format 0 in Table 10 is 40 bits, DCI format 0 of type 2 is 41 bits. Whether DCI format 0 is type 1 or type 2 may be set by the RRC layer. The ASRS activation field is an additional field for indicating activation of aperiodic SRS. The ASRS activation field is included in the SRS positioning fields 1913, 1922, and 1931 of FIG. 19.

If the ASRS activation field is '0', this indicates that aperiodic SRS is deactivated. In this case, DCI format 0 of type 2 is shown in Table 11.

On the other hand, when the ASRS activation field is '1', this indicates that aperiodic SRS is activated. When the aperiodic SRS is activated, the terminal enters a state capable of transmitting or transmitting the aperiodic SRS. The problem is how the UE obtains ASRS configuration parameters required to transmit aperiodic SRS.

The ASRS configuration parameter may include various fields necessary for transmission of the ASRS as shown in Table 12.

SRS Information Element Number of Bits Comment Transmission bw 2 Four SRS BWs per operating BW Frequency position 3 or 5 Starting BW Position (3 bits for <= 5 MHz) Transmission comb One Two combs SRS Cyclic Shift 3 Eight cyclic shifts SRS Configuration Index I _SRS 9 configurations on subframes assigned for SRS transmission Duration 0 One-Shot Transmission or Same Duration SRS BW Configuration 0 One-shot or already known through SIB CRC (UE ID) 16 UE ID masked in the CRC TOTAL 35 or  37

Referring to Table 12, the transmission bandwidth (Transmission BW) indicates the number of SRS transmission bandwidths per operating bandwidth. The frequency position field is a parameter that determines the start position of an uplink bandwidth with respect to the ASRS. The Transmission Comb field is a parameter that defines an UpPTS section belonging to a special subframe in the TDD system. The SRS Configuration Index field is a parameter that determines the position and offset of a subframe in which the ASRS is transmitted. The cyclic shift field is a parameter for generating a sequence for transmission of the ASRS.

To obtain the ASRS configuration parameters, it is basically assumed that the ASRS activation field indicates activation of aperiodic SRS. However, in some cases, the UE may receive the ASRS configuration parameter from the system information or the RRC layer in advance without the premise of activating the aperiodic SRS. A method for acquiring the ASRS configuration parameter by the terminal is as follows.

According to an embodiment, the base station may provide the ASRS configuration parameters to the terminal as an RRC message. This is called ASRS setting mode 1 (ie, mode switch = '0').

According to another embodiment, the base station may provide the ASRS configuration parameters to the terminal through the PDCCH. This is called ASRS setting mode 2 (ie, mode switch = '1').

The ASRS setting mode is identified by mode switches 1911 and 1921. The mode switches 1911 and 19210 may indicate the ASRS configuration mode 1 if the bit is '0' and the ASRS configuration mode 2 if the bit is '1'. The mode switches 1911 and 1921 correspond to flags identifying existing DCI formats 0 / 1A. That is, the flag may perform the functions of the mode switches 1911 and 1921. The reason for this is as follows.

Assuming DCI format 1A does not add an ASRS activation field, DCI format 0 only includes an ASRS activation field. This means that including the ASRS activation field is only DCI format 0. Since the inclusion of the ASRS activation field is fixed to DCI format 0, the flag identifying the existing DCI format 0 / 1A is considered a redundant field. Thus, the flag can function as mode switches 1911 and 1921. In this case, the flag does not perform its original function as a DCI format identifier. Therefore, a code point that is not originally used as a flag function can be used to distinguish the ASRS setting mode.

The ASRS setup modes 1 and 2 have the following differences. In the ASRS configuration mode 1, the ASRS configuration parameter is higher layer signaling. Thus, type 2 DCI format 0 and ASRS configuration parameters are separated. In this case, DCI format 0 of type 2 includes fields necessary for the role of an uplink grant as shown in Table 11 above.

On the other hand, in the ASRS configuration mode 2, the ASRS configuration parameter is included in DCI format 0. That is, type 2 DCI format 0 and ASRS configuration parameters are not separated. In this case, DCI format 0 becomes a new DCI format having a completely different nature from the uplink grant. Type 2 DCI format 0 may be configured as shown in Table 13.

Referring to Tables 11 and 13, if the mode switches 1911 and 1921 are '0', the DCI format is Table 11, and if it is '1', the DCI format is Table 13.

In this way, if a flag that distinguishes DCI format 0 / 1A is used to distinguish a setup parameter transmission mode of aperiodic SRS, there is no restriction on uplink transmission that occurs by using a code point for DCI format 0 and performance degradation occurs. There is an advantage that does not.

20 is a flowchart illustrating a method of transmitting an ASRS configuration parameter by a base station according to an embodiment of the present invention. Hereinafter, a description will be given based on DCI format 0. However, this is only an example, and all DCI formats capable of configuring an uplink grant, for example, DCI format 4, may be applied.

Referring to FIG. 20, the base station determines whether to add an ASRS activation field to DCI format 0 (S2000). The ASRS activation field may be 1 bit. If the base station does not add the ASRS activation field to the DCI format 0, the base station configures an uplink grant with a field of the DCI format 0 of type 1 as shown in Table 10 (S2030).

If the base station adds the ASRS activation field to DCI format 0, the base station determines whether to activate the ASRS (S2005). In this case, the DCI format 0 belongs to type 2. The terminal needs to know whether the DCI format 0 is type 1 or 2, which is notified by signaling to a higher layer of the base station. The upper layer includes a layer above the physical layer, for example, MAC and RRC.

In S2005, if the base station determines ASRS deactivation, the base station configures an uplink grant with a field of DCI format 0 of type 2 as shown in Table 11 above (S2020). On the other hand, if the base station determines the ASRS activation, the base station sets the mode switch (S2010). The mode switch indicates whether the DCI format 0 includes an ASRS configuration parameter. In another aspect, the mode switch indicates whether the ASRS configuration parameter is given by higher layer signaling or included in DCI. The setting of the mode switch is to determine the ASRS setting mode (or transmission mode). The mode switch may be a flag of the conventional DCI format 0.

The base station determines whether the mode switch is set to the ASRS configuration mode 1 (S2015). For example, if the value of the mode switch is '0', the ASRS setting mode is 1, and if the mode switch is '1', the ASRS setting mode is 2. If the mode switch indicates the ASRS configuration mode 1, the base station configures an uplink grant with a field of the existing DCI format 0 (S2020). This is because since the ASRS configuration parameter is performed by higher layer signaling, the DCI may perform the function of the original uplink grant.

If the mode switch indicates the ASRS configuration mode 2, the base station configures an uplink grant including the ASRS configuration parameter (S2025). In this case, the uplink grant may include parameter fields shown in Table 13 above.

21 is a flowchart illustrating a method of receiving an ASRS configuration parameter by a terminal according to another embodiment of the present invention. Hereinafter, the description will be based on DCI format 0. However, this is only an example, and all DCI formats capable of configuring an uplink grant, for example, DCI format 4, may also be applied.

Referring to FIG. 21, if the uplink grant is successfully decoded, the terminal passes the CRC check (S2100). The CRC check may be performed by demasking a Cell-Radio Network Temporary Identifier (C-RNTI), which is a unique identifier of the UE, to the CRC of the uplink grant.

The terminal determines whether an ASRS activation field is present in the uplink grant (S2105). If the ASRS activation field is not present in the uplink grant, the uplink grant is a conventional type 1 DCI format 0. Therefore, the terminal interprets the information according to the field of the existing DCI format 0 (S2110).

If the ASRS activation field is present in the uplink grant, the terminal determines again whether the ASRS is activated (S2115). The uplink grant is DCI format 0 of type 2. That is, it further includes 1 bit than DCI format 0 of type 1. ASRS activation can be determined by checking whether the ASRS activation field is '0' or '1'.

If the ASRS is deactivated, the terminal interprets the information as a field of the existing DCI format 0 (S2110).

If the ASRS is activated, the terminal determines whether the mode switch in the uplink grant is 0 (S2120). If the mode switch is 0, it can be seen that the ASRS configuration parameter is transmitted based on the ASRS configuration mode 1. That is, the ASRS configuration parameter is transmitted by higher layer signaling. The uplink grant includes the field as it was originally performing. Therefore, the terminal interprets the information according to the field of the existing DCI format 0 (S2110).

In operation S2120, if the mode switch is 1, the ASRS configuration parameter may be transmitted based on the ASRS configuration mode 2. That is, the ASRS configuration parameter is included in the uplink grant and transmitted. Therefore, the terminal interprets the information on the premise that the DCI includes the ASRS configuration parameter (S2125).

In the above description, all elements constituting the embodiments of the present invention are described as being combined or operating in combination, but the present invention is not necessarily limited to the embodiments. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more. In addition, although all of the components may be implemented in one independent hardware, each or all of the components may be selectively combined to perform some or all functions combined in one or a plurality of hardware. It may be implemented as a computer program having a. Codes and code segments constituting the computer program may be easily inferred by those skilled in the art. Such a computer program may be stored in a computer readable storage medium and read and executed by a computer, thereby implementing embodiments of the present invention. The storage medium of the computer program may include a magnetic recording medium, an optical recording medium, a carrier wave medium, and the like.

In addition, the terms "comprise", "comprise" or "having" described above mean that the corresponding component may be included, unless otherwise stated, and thus excludes other components. It should be construed that it may further include other components instead. All terms, including technical and scientific terms, have the same meanings as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms commonly used, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be construed in an ideal or excessively formal sense unless explicitly defined in the present invention.

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

Claims (34)

Determining, by a base station, a resource and a period to be allocated to the transmission of the aperiodic sounding reference signal to a user terminal to which the aperiodic sounding reference signal is to be transmitted;
Transmitting indication information on the determined resource and period using a physical control channel; And
And after the transmission of the physical control channel, by the user terminal receiving an aperiodic sounding reference signal for repeatedly transmitting the determined period in the determined resource, resource allocation for aperiodic transmission of a sounding reference signal, and How to send cycle information. The method of claim 1,
The indication information may include at least one of information on a start position of the resource, information on a bandwidth of the resource, and information on an interval for transmitting the aperiodic sounding reference signal. A method of transmitting resource allocation and period information for aperiodic transmission.
The method of claim 1,
The physical control channel is a PDCCH, and the indication information is a period of the non-periodic transmission of a sounding reference signal, characterized in that using a value and a filler bit in the range for the uplink resource allocation in format 0 of the PDCCH. Method for transmitting resource allocation and cycle information for the.
The method of claim 1,
The physical control channel is a PDCCH, and the indication information is a resource for aperiodic transmission of a sounding reference signal, characterized in that the value of a range not used in the field for downlink resource allocation in format 1A of the PDCCH. Method of transmitting allocation and period information.
The method of claim 1,
The indication information includes resource allocation and period information for aperiodic transmission of the sounding reference signal, characterized in that the information indicating the resource and the period to be allocated to the transmission of the aperiodic sounding reference signal for two or more user terminals. How to send.
The user terminal receiving a physical control channel from a base station;
Checking whether the received information of the physical control channel is indication information indicating a resource and a period to be allocated for transmission of an aperiodic sounding reference signal;
Calculating a resource and a period for transmitting an aperiodic sounding reference signal using the indication information when the information of the control channel is the indication information; And
And repeatedly transmitting an aperiodic sounding reference signal at the resource with the period, wherein the resource allocation and period information for the aperiodic transmission of a sounding reference signal is received.
The method of claim 6,
The indication information may include at least one of information on a start position of the resource, information on a bandwidth of the resource, and information on an interval for transmitting the aperiodic sounding reference signal. A method of receiving resource allocation and period information for aperiodic transmission.
The method of claim 6,
The physical control channel is a PDCCH, and the indication information is a period of the non-periodic transmission of a sounding reference signal, characterized in that using a value and a filler bit in the range for the uplink resource allocation in format 0 of the PDCCH. Receiving resource allocation and cycle information for the.
The method of claim 6,
The physical control channel is a PDCCH, and the indication information is a resource for aperiodic transmission of a sounding reference signal, characterized in that the value of a range not used in the field for downlink resource allocation in format 1A of the PDCCH. How to receive assignment and period information.
The method of claim 6,
The indication information includes resource allocation and period information for aperiodic transmission of the sounding reference signal, characterized in that the information indicating the resource and the period to be allocated to the transmission of the aperiodic sounding reference signal for two or more user terminals. How to receive.
The method of claim 6,
And allocating data transmission or reception resources using the information received prior to reception of the physical control channel, the resource allocation and period information for aperiodic transmission of a sounding reference signal.
A determination unit for determining, by a base station, a resource and a period to be allocated to the transmission of the aperiodic sounding reference signal to a user terminal to which the aperiodic sounding reference signal is to be transmitted;
An indication information generation unit for generating indication information indicating indication information on the determined resource and period;
A coding unit including the indication information in a physical control channel to generate a radio signal; And
And a transmitter / receiver for transmitting the radio signal to the user terminal and receiving the aperiodic sounding reference signal transmitted by the user terminal by repeating the determined period in the determined resource. Device for transmitting resource allocation and cycle information for.
The method of claim 12,
The indication information may include at least one of information on a start position of the resource, information on a bandwidth of the resource, and information on an interval for transmitting the aperiodic sounding reference signal. An apparatus for transmitting resource allocation and period information for aperiodic transmission.
The method of claim 12,
The physical control channel is a PDCCH, and the indication information is a period of the non-periodic transmission of a sounding reference signal, characterized in that using a value and a filler bit in the range for the uplink resource allocation in format 0 of the PDCCH. Apparatus for transmitting resource allocation and cycle information for the.
The method of claim 12,
The physical control channel is a PDCCH, and the indication information is a resource for aperiodic transmission of a sounding reference signal, characterized in that the value of a range not used in the field for downlink resource allocation in format 1A of the PDCCH. Device for transmitting allocation and period information.
The method of claim 12,
The indication information includes resource allocation and period information for aperiodic transmission of the sounding reference signal, characterized in that the information indicating the resource and the period to be allocated to the transmission of the aperiodic sounding reference signal for two or more user terminals. Transmitting device.
A transceiver for receiving a radio signal including a physical control channel from a base station and transmitting a sounding reference signal;
If the received information of the physical control channel is indication information indicating a resource and a period to be allocated to the transmission of the aperiodic sounding reference signal, and if the information of the control channel is the indication information, A signal transmission control unit for calculating a resource and a period for transmitting the periodic sounding reference signal; And
An apparatus for receiving resource allocation and period information for aperiodic transmission of a sounding reference signal, comprising a sounding reference signal generator for generating an aperiodic sounding reference signal according to the period from the resource calculated by the signal transmission controller .
The method of claim 17,
The indication information may include at least one of information on a start position of the resource, information on a bandwidth of the resource, and information on an interval for transmitting the aperiodic sounding reference signal. An apparatus for receiving resource allocation and periodic information for aperiodic transmission.
The method of claim 17,
The physical control channel is a PDCCH, and the indication information is a period of the non-periodic transmission of a sounding reference signal, characterized in that using a value and a filler bit in the range for the uplink resource allocation in format 0 of the PDCCH. Device for receiving resource allocation and period information for.
The method of claim 17,
The physical control channel is a PDCCH, and the indication information is a resource for aperiodic transmission of a sounding reference signal, characterized in that the value of a range not used in the field for downlink resource allocation in format 1A of the PDCCH. Device for receiving allocation and periodic information.
The method of claim 17,
The indication information includes resource allocation and period information for aperiodic transmission of the sounding reference signal, characterized in that the information indicating the resource and the period to be allocated to the transmission of the aperiodic sounding reference signal for two or more user terminals. Receiving device.
The method of claim 17,
And the transceiver is configured to receive resource allocation and period information for aperiodic transmission of a sounding reference signal, allocating a data transmission or reception resource using information received prior to reception of a physical control channel.
In the method for transmitting a sounding reference signal (SRS) by the terminal in a wireless communication system,
Identifying a code point represented by bits of a resource allocation field for data transmission of a physical downlink control channel (PDCCH);
Checking whether a value of the checked code point is out of a range of indication information for resource allocation determined according to a preset bandwidth;
When the value of the code point is out of the indication information range, checking information about a start point for transmitting the SRS and SRS transmission period information through bits and filler bits representing the value of the code point; ,
Transmitting the SRS in accordance with the identified information.
24. The method of claim 23,
The PDCCH is format 0,
The resource allocation field is a field for uplink resource allocation, characterized in that for transmitting a sounding reference signal.
24. The method of claim 23,
The PDCCH is format 1A,
The resource allocation field is a field for downlink resource allocation, characterized in that for transmitting a sounding reference signal.
In the method of transmitting a sounding reference signal (SRS) by the terminal in a wireless communication system,
Receiving downlink control information from a base station including a mode switch indicating a mode in which a configuration parameter relating to an aperiodic sounding reference signal is transmitted;
Determining a method of interpreting the downlink control information based on the mode switch;
Interpreting the downlink control information according to the determined analysis method; And
Performing uplink transmission to the base station based on the analyzed downlink control information;
And the mode switch indicates whether the configuration parameter is included in the downlink control information and transmitted or is transmitted by higher layer signaling.
The method of claim 26,
And the mode switch is a flag for identifying a format of the downlink control information.
The method of claim 26,
The downlink control information further includes an activation field indicating activation or deactivation of the aperiodic sounding reference signal.
29. The method of claim 28,
If the activation field indicates activation of the aperiodic sounding reference signal, the uplink transmission is characterized in that the transmission of the aperiodic sounding reference signal, sounding reference signal transmission method.
In a method of receiving a sounding reference signal (SRS) by a base station in a wireless communication system,
Transmitting downlink control information including a mode switch indicating a mode in which a configuration parameter relating to an aperiodic sounding reference signal is transmitted to the terminal;
Transmitting the setting parameter; And
Receiving an uplink signal generated based on the configuration parameter from the terminal,
And the mode switch indicates whether the configuration parameter is transmitted by being included in the downlink control information or by higher layer signaling.
31. The method of claim 30,
And the configuration parameter is a message generated in a radio resource control (RRC) layer.
31. The method of claim 30,
And the configuration parameter is included in the downlink control information.
In the apparatus for transmitting a sounding reference signal (SRS) by the terminal in a wireless communication system,
A receiver for receiving downlink control information from a base station, the downlink control information including a mode switch indicating a mode in which a configuration parameter relating to an aperiodic sounding reference signal is transmitted;
A decision unit to determine an analysis method of the downlink control information based on the mode switch, and to analyze the downlink control information according to the determined analysis method; And
It includes a transmitter for performing uplink transmission to the base station based on the analyzed downlink control information,
And the mode switch indicates whether the configuration parameter is transmitted by being included in the downlink control information or by higher layer signaling.
An apparatus for receiving a sounding reference signal (SRS) by a base station in a wireless communication system,
A downlink control information including a mode switch indicating a mode in which a configuration parameter related to an aperiodic sounding reference signal is transmitted and a transmission unit for shortly transmitting the configuration parameter; And
Including a receiving unit for receiving an uplink signal generated based on the configuration parameter from the terminal,
And the mode switch indicates whether the configuration parameter is transmitted by being included in the downlink control information or by higher layer signaling.

Images