KR20220021175A - Method and apparatus for determining bandwidth of sounding reference signal - Google Patents

Abstract

To determine an SRS bandwidth, a base station transmits a first SRS transmission parameter including information indicating a first SRS bandwidth to a user terminal, receives a first SRS transmitted from a user terminal in a first SRS bandwidth, calculates a first degree of interference with respect to the first SRS, and determines a second SRS bandwidth based on the first interference degree and a preset first threshold value.

Description

Sounding reference signal bandwidth determination method and apparatus {METHOD AND APPARATUS FOR DETERMINING BANDWIDTH OF SOUNDING REFERENCE SIGNAL}

The following embodiments relate to a technique for determining a bandwidth of a sounding reference signal between a base station and a user terminal of a wireless communication network system.

Wireless communication network systems are widely deployed to provide various types of communication contents such as voice, data, and the like. Typical wireless communication networks may be multiple access networks capable of supporting communication with multiple users by sharing available network resources (eg, bandwidth, transmit power, etc.). Examples of such multiple access networks include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access systems (FDMA), orthogonal frequency division multiple access (OFDMA) systems.

In general, wireless multiple access communication networks are capable of simultaneously supporting communication for user terminals that are multiple mobile devices. Each user terminal may communicate with one or more base stations via transmissions on the forward and reverse links. Forward link (or downlink) refers to the communication link from base stations to user terminals, and reverse link (or uplink) refers to the communication link from user terminals to base stations. Further, communications between mobile devices and base stations may be established via single input single output (SISO) systems, multiple input single output (MISO) systems, multiple input multiple output (MIMO) systems, and the like.

An embodiment may provide a method of determining the SRS bandwidth performed by the base station.

An embodiment may provide an SRS transmission method performed by a user terminal.

According to one aspect, a method for determining a sounding reference signals (SRS) bandwidth, performed by a base station, includes transmitting a first SRS transmission parameter including information indicating a first SRS bandwidth to a user terminal, from the user terminal Receiving a first SRS generated based on a first SRS transmission parameter, wherein the first SRS is generated with the first SRS bandwidth, calculating a first degree of interference for the first SRS, the first Determining a second SRS bandwidth based on an interference degree and a preset first threshold, and transmitting a second SRS transmission parameter including information indicating the second SRS bandwidth to the user terminal, A second SRS is generated with the second SRS bandwidth by the user terminal.

The first SRS bandwidth may be an entire bandwidth usable by the user terminal.

The first SRS bandwidth may be 216 RB.

The first interference degree may be SRS signal to interference plus noise ratio (SINR).

The determining of the second SRS bandwidth based on the first degree of interference and the preset first threshold may include: when the first degree of interference is less than the first threshold, a second SRS bandwidth having a smaller bandwidth than the first SRS bandwidth determining 2 SRS bandwidths as the second SRS bandwidths; and determining the first SRS bandwidths as the second SRS bandwidths when the first interference degree is equal to or greater than the first threshold value.

The first threshold value may be preset based on an uplink block error rate (BLER) for one or more user terminals connected to the base station.

The method for determining the SRS bandwidth includes receiving the second SRS generated based on the second SRS transmission parameter from the user terminal, the second SRS being generated with the second SRS bandwidth, to the second SRS Calculating a second degree of interference with respect to , determining a third SRS bandwidth based on the second degree of interference and a preset second threshold value, and transmitting a third SRS including information indicating the third SRS bandwidth The method may further include transmitting a parameter to the user terminal, and a third SRS may be generated by the user terminal using the third SRS bandwidth.

According to another aspect, a base station performing a method of determining a sounding reference signals (SRS) bandwidth includes a memory in which a program for determining an SRS bandwidth is recorded, and a processor executing the program, the program comprising: Transmitting a first SRS transmission parameter including information indicating 1 SRS bandwidth to a user terminal, receiving a first SRS generated based on the first SRS transmission parameter from the user terminal - The first SRS is generated with the first SRS bandwidth; calculating a first degree of interference with respect to the first SRS; determining a second SRS bandwidth based on the first degree of interference and a preset first threshold value; and transmitting a second SRS transmission parameter including information indicating a second SRS bandwidth to the user terminal, and the user terminal generates a second SRS with the second SRS bandwidth.

According to another aspect, a method for transmitting sounding reference signals (SRS), performed by a user terminal, includes receiving a first SRS transmission parameter including information indicating a first SRS bandwidth from a base station, the first SRS generating a first SRS with the first SRS bandwidth based on a transmission parameter, transmitting the first SRS to the base station, and a second SRS transmission parameter including information indicating a second SRS bandwidth from the base station receiving, generating a second SRS with the second SRS bandwidth based on the second SRS transmission parameter, and transmitting the second SRS to the base station.

The first SRS bandwidth may be an entire bandwidth usable by the user terminal.

The first SRS bandwidth may be 216 RB.

The second SRS bandwidth may be determined by the base station based on a first degree of interference with the first SRS and a preset first threshold value.

The first interference degree may be SRS signal to interference plus noise ratio (SINR).

The generating of the second SRS with the second SRS bandwidth based on the second SRS transmission parameter may include, when the second SRS bandwidth is smaller than the total bandwidth available to the user terminal, divided into a plurality of frequency bands. and generating the second SRS using

According to another aspect, a user terminal for performing an SRS transmission method includes a memory in which a program for transmitting SRS is recorded, and a processor for executing the program, wherein the program uses a first SRS bandwidth from a base station Receiving a first SRS transmission parameter including information indicating; generating a first SRS with the first SRS bandwidth based on the first SRS transmission parameter; transmitting the first SRS to the base station; Receiving a second SRS transmission parameter including information indicating a second SRS bandwidth from the base station, generating a second SRS with the second SRS bandwidth based on the second SRS transmission parameter, and to the base station The step of transmitting the second SRS is performed.

A method of determining the SRS bandwidth performed by the base station may be provided.

An SRS transmission method performed by a user terminal may be provided.

1 illustrates a wireless communication network system according to an example.
2 is a block diagram of a base station according to an embodiment.
3 is a block diagram of a user terminal according to an embodiment.
4 is a flowchart of a method for a base station to determine an SRS bandwidth and a method for a user terminal to transmit an SRS according to an embodiment.
5 illustrates an SRS transmitted with full bandwidth according to an example.
6 illustrates an SRS transmitted as a part of a total bandwidth according to an example.
7 is a flowchart of a method of determining a first target SRS bandwidth based on a first interference degree and a first threshold value according to an example.
8 and 9 illustrate a method of presetting a first threshold value for a base station according to an example.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, since various changes may be made to the embodiments, the scope of the patent application is not limited or limited by these embodiments. It should be understood that all modifications, equivalents and substitutes for the embodiments are included in the scope of the rights.

The terms used in the examples are used for the purpose of description only, and should not be construed as limiting. The singular expression includes the plural expression unless the context clearly dictates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate that a feature, number, step, operation, component, part, or a combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiment belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

In addition, in the description with reference to the accompanying drawings, the same components are given the same reference numerals regardless of the reference numerals, and the overlapping description thereof will be omitted. In describing the embodiment, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the embodiment, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When it is described that a component is "connected", "coupled" or "connected" to another component, the component may be directly connected or connected to the other component, but another component is between each component. It will be understood that may also be "connected", "coupled" or "connected".

Components included in one embodiment and components having a common function will be described using the same names in other embodiments. Unless otherwise stated, descriptions described in one embodiment may be applied to other embodiments as well, and detailed descriptions within the overlapping range will be omitted.

1 illustrates a wireless communication network system according to an example.

<Beamforming>

A base station (BS) 100 supporting multiple antennas performs downlink (or downlink) and uplink (uplink) beamforming. For example, the base station 100 may be an eNB base station or a gNB base station, and is not limited to the described embodiment. Downlink beamforming by the base station 100 means forming a downlink transmission beam for transmitting a signal in the downlink, and the uplink beamforming by the base station 100 is uplink for receiving a signal in the uplink. It means to form a link receive beam. The uplink receive beam may be formed toward a transmitting terminal (a user terminal having a signal to transmit to a base station), and a downlink transmit beam may be formed toward a receiving terminal (a user terminal having a signal to be transmitted by the base station). The base station 100 may perform downlink beamforming and uplink beamforming by using a predetermined beam pattern.

Each of the user terminals 110 and 120 supporting multiple antennas may perform downlink and uplink beamforming. Downlink beamforming by each user terminal (110, 120) means forming a downlink reception beam for receiving a signal in a downlink, and uplink beamforming by each user terminal (110, 120) is up It means forming an uplink transmit beam for transmitting a signal on the link. The uplink transmission beam may be formed by a user terminal (transmission terminal) having a signal to be transmitted to the base station 110 among the user terminals 110 and 120 , and the downlink reception beam is formed by the user terminals 110 and 120 among the user terminals 110 and 120 . It may be formed by a user terminal (receiving terminal) having a signal to be received from the base station 100 .

For example, the base station 100 may collect downlink beam information selected by the user terminals 110 and 120 and perform downlink beamforming based on the collected downlink beam information. The base station 100 may transmit a reference signal (RS) in each downlink beam so that the user terminals 110 and 120 can select the downlink beam. That is, the base station 100 may sequentially select downlink transmission beams in a predetermined order, and transmit a reference signal through the selected downlink transmission beam.

<Sounding reference signal>

A sounding reference signal (SRS) is mainly used for channel quality measurement to perform frequency-selective scheduling of the uplink, and is not related to transmission of uplink data and/or control information. However, the present invention is not limited thereto, and the SRS may be used for various other purposes to improve power control or support various start-up functions of user terminals that have not been scheduled recently. As an example of a start-up function, an initial modulation and coding scheme (MCS), initial power control for data transmission, timing advance, and frequency semi-selective scheduling may be included. there is. In this case, the frequency semi-selective scheduling refers to scheduling in which a frequency resource is selectively allocated to the first slot of a subframe, and the frequency resource is allocated by pseudo-randomly jumping to another frequency in the second slot.

In addition, SRS can be used to measure the downlink channel quality under the assumption that the radio channel is reciprocal between the uplink and the downlink. The SRS may be channel feedback information. This assumption is particularly valid in a Time Division Duplex (TDD) system in which the uplink and the downlink share the same frequency spectrum and are separated in the time domain.

In the weak field area of the 5G wireless network, when the base station receives the SRS using the entire bandwidth, the SRS RSRP/SINR may be lowered when the channel feedback information is transmitted with the maximum SRS transmission power of the user terminal. Accordingly, the performance of demodulating the channel feedback information in the base station may be deteriorated due to the rise of the uplink BLER, which may lead to deterioration of the beamforming performance.

The threshold value of SRS RSRP/SINR at which the uplink BLER rises according to the radio environment may be different for each base station (or cell), but when the base stations are operated with the same parameters, unnecessary radio resources may be wasted. For example, in a strong field of a 5G wireless network, it is advantageous to acquire channel information through SRS that uses the entire bandwidth, but in a weak field of a 5G wireless network, even if the SRS is transmitted to the base station by maximizing the SRS transmission power of the user terminal Failed to transmit TCP ACK may cause intermittent data stop/disconnection.

A method of determining the SRS bandwidth of the user terminal performed by the base station and the SRS transmission method performed by the user terminal will be described in detail with reference to FIGS. 2 to 9 below.

2 is a block diagram of a base station according to an embodiment.

The base station 200 includes a communication unit 210 , a processor 220 , and a memory 230 . For example, the base station 200 may be the base station 100 described above with reference to FIG. 1 . For example, the base station 200 may be a gNB of an SA network or an NSA network. As another example, the base station may be an eNB of an LTE wireless network.

The communication unit 210 is connected to the processor 220 and the memory 230 to transmit and receive data. The communication unit 210 may be connected to another external device to transmit/receive data. Hereinafter, the expression "transmitting and receiving "A" may indicate transmitting and receiving "information or data representing A".

The communication unit 210 may be implemented as circuitry in the base station 200 . For example, the communication unit 210 may include an internal bus and an external bus. As another example, the communication unit 210 may be an element that connects the base station 200 and an external device. The communication unit 210 may be an interface. The communication unit 210 may receive data from an external device and transmit the data to the processor 220 and the memory 230 .

The processor 220 processes data received by the communication unit 210 and data stored in the memory 230 . A “processor” may be a data processing device implemented in hardware having circuitry having a physical structure for performing desired operations. For example, desired operations may include code or instructions included in a program. For example, a data processing device implemented as hardware includes a microprocessor, a central processing unit, a processor core, a multi-core processor, and a multiprocessor. , an Application-Specific Integrated Circuit (ASIC), and a Field Programmable Gate Array (FPGA).

Processor 220 executes computer readable code (eg, software) stored in memory (eg, memory 230 ) and instructions issued by processor 220 .

The memory 230 stores data received by the communication unit 210 and data processed by the processor 220 . For example, the memory 230 may store a program (or an application, software). The stored program may be a set of syntaxes coded to determine the SRS bandwidth and executable by the processor 220 .

According to one aspect, memory 230 may include one or more of volatile memory, non-volatile memory and random access memory (RAM), flash memory, hard disk drive, and optical disk drive.

The memory 230 stores an instruction set (eg, software) for operating the base station 200 . The instruction set for operating the base station 200 is executed by the processor 220 .

The communication unit 210 , the processor 220 , and the memory 230 will be described in detail below with reference to FIGS. 4 to 9 .

3 is a block diagram of a user terminal according to an embodiment.

The user terminal 300 includes a communication unit 310 , a processor 320 , and a memory 330 . For example, the user terminal 300 may be the user terminal 110 or the user terminal 120 described above with reference to FIG. 1 .

The communication unit 310 is connected to the processor 320 and the memory 330 to transmit and receive data. The communication unit 310 may be connected to another external device to transmit/receive data.

The communication unit 310 may be implemented as a circuit network in the user terminal 300 . For example, the communication unit 310 may include an internal bus and an external bus. As another example, the communication unit 310 may be an element that connects the user terminal 300 and an external device. The communication unit 310 may be an interface. The communication unit 310 may receive data from an external device and transmit the data to the processor 320 and the memory 330 .

The processor 320 processes data received by the communication unit 310 and data stored in the memory 330 . Processor 320 executes computer readable code (eg, software) stored in memory (eg, memory 330 ) and instructions issued by processor 320 .

The memory 330 stores data received by the communication unit 310 and data processed by the processor 320 . For example, the memory 330 may store a program (or an application, software). The stored program may be a set of syntax that is coded so as to transmit the SRS and is executable by the processor 320 .

According to one aspect, memory 330 may include one or more of volatile memory, non-volatile memory and RAM, flash memory, hard disk drive, and optical disk drive.

The memory 330 stores a set of instructions (eg, software) for operating the user terminal 300 . The instruction set for operating the user terminal 300 is executed by the processor 320 .

The communication unit 310 , the processor 320 , and the memory 330 will be described in detail below with reference to FIGS. 4 to 6 .

4 is a flowchart of a method for a base station to determine an SRS bandwidth and a method for a user terminal to transmit an SRS according to an embodiment.

The following steps 405 to 455 are performed by the base station 200 and the user terminal 300 described above with reference to FIGS. 2 and 3 .

In step 405 , the base station 200 transmits a first SRS transmission parameter including information indicating the first SRS bandwidth to the user terminal 300 . Transmission of the SRS transmission parameter to the user terminal 300 may be performed periodically. For example, the SRS transmission parameter may include at least one parameter for uplink power control and numerology.

For example, transmission of the SRS transmission parameter may be performed for each preset radio frame period.

For example, when the first SRS transmission parameter is an initial SRS parameter, the first SRS bandwidth may be the entire bandwidth that the user terminal 300 can use. The total bandwidth that the user terminal 300 can use may vary depending on the type of the wireless network. For example, the Sub-6 GHz band or the n257 (28 GHz) band may be used through the wireless network.

For example, information indicating the first SRS bandwidth may correspond to B-SRS (or B _srs ) of 3GPP TS 38.211 <SRS BandWidth Configuration>. The information indicating the SRS bandwidth may be an index of 0, 1, 2, or 3. Index 0 may indicate 216 RBs (resource block), index 1 may indicate 108 RBs, index 2 may indicate 36 RBs, and index 3 may indicate 4 RBs.

For example, when the base station 200 and the user terminal 300 perform initial communication, the entire bandwidth may be used as the first SRS bandwidth because the radio environment cannot be known yet. As another example, when the wireless environment between the base station 200 and the user terminal 300 is good, the entire bandwidth may be used as the first SRS bandwidth. Index 0 may indicate the entire bandwidth.

In step 410, the user terminal 300 generates a first SRS with a first SRS bandwidth based on the first SRS transmission parameter. For example, when the first SRS transmission parameter indicates index 0, the first SRS may be generated to use the entire bandwidth (eg, 216 RBs).

In step 415, the user terminal 300 transmits the first SRS. The first SRS may be transmitted using the first SRS bandwidth. The base station 200 receives the first SRS generated based on the first SRS transmission parameter from the user terminal 300 .

According to one aspect, when the first SRS bandwidth is the entire bandwidth, the first SRS may be transmitted as shown in FIG. 5 below. SRS using the full bandwidth will be described in detail with reference to FIG. 5 below.

In step 420, the base station 200 calculates a first degree of interference with respect to the first SRS. For example, the degree of interference with respect to the SRS may be a signal to interference plus noise ratio (SINR), and is not limited to the described embodiment. The SINR may be an SRS SINR or an uplink SINR.

In step 425 , the base station 200 determines a second SRS bandwidth based on the first interference degree and a preset first threshold value. The second SRS bandwidth may be the same as the first SRS bandwidth, which is the previous bandwidth, or may be different from the first SRS bandwidth. A method of determining the second SRS bandwidth will be described in detail with reference to FIG. 7 below.

According to an aspect, the first threshold value may be preset for the base station 200 . A method of presetting the threshold will be described in detail below with reference to FIGS. 8 and 9 .

In step 430 , the base station 200 transmits a second SRS transmission parameter including information indicating the second SRS bandwidth to the user terminal 300 .

For example, when the transmission of the first SRS transmission parameter is performed in the first radio frame, the transmission of the second SRS transmission parameter may be performed in the second radio frame that is the next frame of the first radio frame.

In step 435, the user terminal 300 generates a second SRS with the first target SRS bandwidth based on the second SRS transmission parameter. For example, when the second SRS transmission parameter indicates index 1, the second SRS may be generated to use a portion of the total bandwidth (eg, 108 RBs). When the second SRS bandwidth is smaller than the total bandwidth that the user terminal 300 can use, the second SRS may be generated using a plurality of divided frequency bands. When the used SRS bandwidth is reduced, transmission power for an individual RB may be increased.

In step 440, the user terminal 300 transmits the second SRS. The second SRS may be transmitted using the second SRS bandwidth. The base station 200 receives the second SRS generated based on the second SRS transmission parameter from the user terminal 300 .

According to one aspect, when the second SRS bandwidth is a part of the total bandwidth, the second SRS may be transmitted as shown in FIG. 6 below. SRS using a portion of the total bandwidth will be described in detail below with reference to FIG. 6 .

In step 445, the base station 200 calculates a second degree of interference for the second SRS.

In step 450 , the base station 200 determines a third SRS bandwidth based on the second interference degree and a preset second threshold value. For example, when the bandwidth of the second SRS is different from the bandwidth of the first SRS, the second degree of interference may be different from the first degree of interference. As another example, even if the bandwidth of the second SRS and the bandwidth of the first SRS are different, the second degree of interference may be the same as the first degree of interference.

In step 455 , the base station 200 transmits a third SRS transmission parameter including information indicating the third SRS bandwidth to the user terminal 300 . After step 455 is performed, the user terminal 300 receiving the third SRS transmission parameter may generate the third SRS with the third SRS bandwidth.

The wireless communication environment between the base station 200 and the user terminal 300 may be repeatedly and periodically measured through the degree of interference to the SRS, and the SRS bandwidth may be adaptively adjusted according to the measured degree. By adaptively adjusting the SRS bandwidth, the performance of acquiring channel information may be improved.

5 illustrates an SRS transmitted with full bandwidth according to an example.

According to one aspect, frames 510 and 520 may be set between the base station 200 and the user terminal 300 . The base station 200 and the user terminal 300 may exchange data based on a subframe or a slot within each frame.

For example, the user terminal 300 may transmit the first SRS 530 in a subframe 511 in the first frame 510 . The first SRS 530 may be transmitted using the entire frequency band that the user terminal 300 can use. Since the first SRS 530 uses the entire frequency band, only one subframe 511 of the first frame 510 may be used.

When the entire frequency band of the second SRS 540 is used also for the second frame 510 , only one subframe 521 of the second frame 520 may be used. When the SRS for the second frame 510 does not use the entire frequency band, a plurality of subframes of the second frame 520 may be used to transmit the SRS.

6 illustrates an SRS transmitted as a part of a total bandwidth according to an example.

For example, when the information indicating the SRS bandwidth is index 1, the SRS bandwidth used to transmit the SRS may be 108 RB. When the SRS bandwidth is 108 RB, the first SRS may be divided into two signals 630 and 635 and transmitted. Two signals 630 and 635 may be generated and transmitted so that frequencies do not overlap. The two signals 630 and 635 may be transmitted through each of the plurality of subframes 611 and 612 .

When information indicating the SRS bandwidth for the second frame 610 is also index 1, two signals 640 and 645 of SRS using a plurality of subframes 621 and 622 of the second frame 620 . can be transmitted.

Although the case of index 1 has been described with reference to FIG. 6 , the case of index 2 and case of index 3 may be similarly described. For example, in case of index 2, 6 subframes in a frame may be used to transmit SRS, and in case of index 3, 54 subframes in a frame may be used to transmit SRS. A frequency band of each subframe may be used to be inversely proportional to the number of used subframes. For example, when 54 subframes are used, a bandwidth of 1/54 may be used for one subframe.

7 is a flowchart of a method of determining a first target SRS bandwidth based on a first interference degree and a first threshold value according to an example.

According to one aspect, the step 425 described above with reference to FIG. 4 may include the following steps 710 to 730 .

In step 710 , the base station 200 determines whether the first degree of interference is less than a preset first threshold. The first threshold value may be preset based on the radio environment of the cell for the base station 200 . For example, the first threshold value may be determined based on transmission performance between the plurality of user terminals connected to the base station 200 . As another example, the first threshold value may be determined to correspond to the first SRS bandwidth determined for the user terminal 300 .

In step 720, when the first interference degree is less than the first threshold, the base station 200 determines a second SRS bandwidth having a smaller bandwidth than the first SRS bandwidth as the second SRS bandwidth. For example, when the first SRS bandwidth is index 0, the second SRS bandwidth may be determined as index 1.

In step 730, the base station 200 determines the first SRS bandwidth as the second SRS bandwidth when the first interference degree is equal to or greater than the first threshold value. For example, when the first SRS bandwidth is index 0, the second SRS bandwidth may also be determined as index 0.

8 and 9 illustrate a method of presetting a first threshold value for a base station according to an example.

According to one aspect, a threshold value at which the uplink BLER for the cell rises based on the performance statistics for the cell of the base station 200 may be set as the first threshold value. The performance statistics may be calculated based on the performance between the base station of the corresponding cell and the plurality of user terminals connected to the base station. For example, -7dB, which is a value at a point at which the value of the SRS SINR 810 for the cell becomes equal to or less than the uplink BLER 820, may be set as the first threshold value. As another example, -2dB, which is a value at a point at which the value of the SRS SINR 910 for the cell becomes equal to or less than the uplink BLER 920, may be set as the first threshold value. The first threshold value may vary according to a wireless communication environment.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiment, or may be known and available to those skilled in the art of computer software. Examples of the computer-readable recording medium include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floppy disks. - includes magneto-optical media, and hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

Software may comprise a computer program, code, instructions, or a combination of one or more thereof, which configures a processing device to operate as desired or is independently or collectively processed You can command the device. The software and/or data may be any kind of machine, component, physical device, virtual equipment, computer storage medium or apparatus, to be interpreted by or to provide instructions or data to the processing device. , or may be permanently or temporarily embody in a transmitted signal wave. The software may be distributed over networked computer systems and stored or executed in a distributed manner. Software and data may be stored in one or more computer-readable recording media.

As described above, although the embodiments have been described with reference to the limited drawings, those skilled in the art may apply various technical modifications and variations based on the above. For example, the described techniques are performed in an order different from the described method, and/or the described components of the system, structure, apparatus, circuit, etc. are combined or combined in a different form than the described method, or other components Or substituted or substituted by equivalents may achieve an appropriate result.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

200: base station
210: communication department
220: processor
230: memory
300: user terminal
310: communication unit
320: processor
330: memory

Claims (17)

A method of determining a sounding reference signals (SRS) bandwidth, performed by a base station, includes:
transmitting a first SRS transmission parameter including information indicating a first SRS bandwidth to a user terminal;
receiving a first SRS generated based on the first SRS transmission parameter from the user terminal, wherein the first SRS is generated with the first SRS bandwidth;
calculating a first degree of interference for the first SRS;
determining a second SRS bandwidth based on the first degree of interference and a preset first threshold; and
transmitting a second SRS transmission parameter including information indicating the second SRS bandwidth to the user terminal;
including,
A second SRS is generated with the second SRS bandwidth by the user terminal,
How to determine SRS bandwidth.
According to claim 1,
The first SRS bandwidth is the total bandwidth that the user terminal can use,
How to determine SRS bandwidth.
According to claim 1,
The first SRS bandwidth is 216 RB,
How to determine SRS bandwidth.
According to claim 1,
The first degree of interference is SRS SINR (signal to interference plus noise Ratio),
How to determine SRS bandwidth.
According to claim 1,
Determining a second SRS bandwidth based on the first interference degree and a preset first threshold may include:
determining, as the second SRS bandwidth, a second SRS bandwidth having a smaller bandwidth than the first SRS bandwidth when the first interference degree is less than the first threshold value; and
determining the first SRS bandwidth as the second SRS bandwidth when the first interference degree is equal to or greater than the first threshold value;
containing,
How to determine SRS bandwidth.
According to claim 1,
The first threshold value is preset based on an uplink block error rate (BLER) for one or more user terminals connected to the base station,
How to determine SRS bandwidth.
According to claim 1,
receiving the second SRS generated based on the second SRS transmission parameter from the user terminal, wherein the second SRS is generated with the second SRS bandwidth;
calculating a second degree of interference for the second SRS;
determining a third SRS bandwidth based on the second degree of interference and a preset second threshold; and
transmitting a third SRS transmission parameter including information indicating the third SRS bandwidth to the user terminal;
further comprising,
A third SRS is generated with the third SRS bandwidth by the user terminal,
How to determine SRS bandwidth.
A computer-readable recording medium containing a program for performing the method of any one of claims 1 to 7.
A base station performing a method of determining a sounding reference signals (SRS) bandwidth comprises:
a memory in which a program for determining the SRS bandwidth is recorded; and
a processor that executes the program
including,
The program is
transmitting a first SRS transmission parameter including information indicating a first SRS bandwidth to a user terminal;
receiving a first SRS generated based on the first SRS transmission parameter from the user terminal, wherein the first SRS is generated with the first SRS bandwidth;
calculating a first degree of interference for the first SRS;
determining a second SRS bandwidth based on the first degree of interference and a preset first threshold; and
transmitting a second SRS transmission parameter including information indicating the second SRS bandwidth to the user terminal;
do,
A second SRS is generated with the second SRS bandwidth by the user terminal,
base station.
A method of transmitting sounding reference signals (SRS) performed by a user terminal includes:
Receiving a first SRS transmission parameter including information indicating a first SRS bandwidth from the base station;
generating a first SRS with the first SRS bandwidth based on the first SRS transmission parameter;
transmitting the first SRS to the base station;
receiving a second SRS transmission parameter including information indicating a second SRS bandwidth from the base station;
generating a second SRS with the second SRS bandwidth based on the second SRS transmission parameter; and
transmitting the second SRS to the base station
containing,
SRS transmission method.
11. The method of claim 10,
The first SRS bandwidth is the total bandwidth that the user terminal can use,
SRS transmission method.
11. The method of claim 10,
The first SRS bandwidth is 216 RB,
SRS transmission method.
11. The method of claim 10,
The second SRS bandwidth is determined by the base station based on a first degree of interference with respect to the first SRS and a preset first threshold value,
SRS transmission method.
14. The method of claim 13,
The first degree of interference is SRS SINR (signal to interference plus noise Ratio),
SRS transmission method.
11. The method of claim 10,
The step of generating a second SRS with the second SRS bandwidth based on the second SRS transmission parameter includes:
generating the second SRS using a plurality of divided frequency bands when the second SRS bandwidth is smaller than the total bandwidth available to the user terminal
containing,
SRS transmission method.
A computer-readable recording medium containing a program for performing the method of any one of claims 10 to 15.
A user terminal performing the SRS transmission method,
a memory in which a program for transmitting the SRS is recorded; and
a processor that executes the program
including,
The program is
Receiving a first SRS transmission parameter including information indicating a first SRS bandwidth from the base station;
generating a first SRS with the first SRS bandwidth based on the first SRS transmission parameter;
transmitting the first SRS to the base station;
receiving a second SRS transmission parameter including information indicating a second SRS bandwidth from the base station;
generating a second SRS with the second SRS bandwidth based on the second SRS transmission parameter; and
Transmitting the second SRS to the base station
to do,
user terminal.

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