KR20230049449A - Apparatus for allocating a reference signal in a wireless communication system and method therefor - Google Patents

Abstract

The purpose of the present invention is to provide a device and method for allocating reference signals to improve data transmission speed in a wireless communication system. The device for allocating a reference signal, according to a preferred embodiment of the present invention, comprises: an information collection unit that collects signal quality information measured by a terminal from a base station and the data transmission rate of a terminal corresponding to the signal quality information; a threshold setting unit that sets a threshold for distinguishing whether the terminal is in a strong electric field area or a non-strong electric field area according to the signal quality information and the speed; and an allocation processing unit that transmits a control signal including the threshold to the base station so that the base station determines a demodulation reference signal (DMRS) allocation method for the terminal according to the threshold.

Description

Apparatus for allocating a reference signal in a wireless communication system and method therefor}

The present invention relates to a reference signal allocation technology, and more particularly, to an apparatus and method for allocating a reference signal to improve data transmission speed in a wireless communication system.

A demodulate reference signal (DMRS) is a reference signal for estimating a channel value necessary for demodulating transmission data.

Korean Patent Publication No. 2018-0131427 (published on December 10, 2018)

An object of the present invention is to provide an apparatus and method for allocating a reference signal to improve data transmission speed in a wireless communication system.

An apparatus for allocating a reference signal according to a preferred embodiment of the present invention includes an information collection unit for collecting signal quality information measured by a terminal from a base station and data transmission rate of a terminal corresponding to the signal quality information, the signal quality information and A threshold setting unit configured to set a threshold for distinguishing whether the terminal is in a strong electric field region or a non-strong electric field region according to the speed, and a demodulation reference signal (DMRS) for the mobile station according to the threshold ) and an allocation processing unit for transmitting a control signal including the threshold to the base station to determine an allocation method.

The threshold setting unit divides the value of the signal quality information into predetermined units to generate a plurality of cases, compares the data transmission rate of the terminal corresponding to each of the plurality of cases, and selects a case in which the data transmission rate of the terminal is the highest. It is characterized in that a threshold case is selected, and a value of signal quality information of the selected threshold case is set as a threshold value.

If the signal quality information is greater than or equal to the threshold, the allocation processing unit sets a demodulation reference signal allocation method for the terminal to the second format, and if the signal quality information is less than the threshold, a demodulation reference signal allocation method for the terminal It is characterized in that for transmitting a control signal including the threshold to the base station to set the first format.

After transmitting the control signal including the threshold to the base station, the information collection unit collects signal quality information measured by the terminal from the base station at a predetermined period and data transmission rate of the terminal corresponding to the signal quality information, The standard setting unit compares the data transmission rate of the terminal corresponding to the threshold case for a predetermined time period and each case other than the threshold case, and determines the data transmission rate of the terminal higher than the data transmission rate of the terminal corresponding to the threshold case for a predetermined period of time or longer. It is determined whether there is a case with the highest terminal data transmission rate, and as a result of the determination, if there is a case having a data transmission rate higher than the data transmission rate of the terminal corresponding to the threshold case, the case with the highest data transmission rate of the terminal is selected as the threshold case. , and changes the value of the signal quality information of the changed threshold case to a threshold, and the allocation processing unit controls including the changed threshold so that the base station determines a demodulation reference signal allocation method for the terminal according to the changed threshold. It is characterized in that the signal is transmitted to the base station.

A method for allocating a reference signal according to a preferred embodiment of the present invention includes the steps of collecting signal quality information measured by a terminal from a base station by an information collection unit and data transmission rate of a terminal corresponding to the signal quality information, and a threshold setting unit setting a threshold for discriminating whether the terminal is in a strong electric field region or a non-strong electric field region according to the signal quality information and the speed, and an allocation processing unit determining whether a base station is a demodulation reference signal for the terminal according to the threshold and transmitting a control signal including the threshold to determine a demodulation reference signal (DMRS) allocation method to the base station.

The setting of the threshold may include generating a plurality of cases by dividing the value of the signal quality information by a predetermined unit by the threshold setting unit, and determining the data transmission rate of the terminal corresponding to each of the plurality of cases by the threshold setting unit. Comparing and selecting a case in which the data transmission rate of the terminal is the highest as a threshold case, and setting a signal quality information value of the selected threshold case as a threshold.

In the step of transmitting the control signal including the threshold to the base station, if the signal quality information is greater than or equal to the threshold, the allocation processing unit sets a demodulation reference signal allocation method for the terminal to the second format, and the signal quality information If is less than the threshold, a control signal including the threshold is transmitted to the base station to set the demodulation reference signal allocation scheme for the terminal to the first format.

In the method, after the step of transmitting the control signal including the threshold to the base station, the information collection unit determines the signal quality information measured by the terminal from the base station at a predetermined period and the data transmission rate of the terminal corresponding to the signal quality information. The step of collecting, wherein the reference setting unit compares the data transmission rate of the terminal corresponding to the threshold case for a predetermined time and each other case other than the threshold case, and the data transmission rate of the terminal corresponding to the threshold case for a predetermined time or more is higher than the data transmission rate of the terminal Determining whether there is a case having a data transmission rate of the terminal, and if the case having a data transmission rate of the terminal higher than the data transmission rate of the terminal corresponding to the threshold case exists, the data transmission of the terminal Changing a case with the highest rate to a threshold case and changing the value of the signal quality information of the changed threshold case to a threshold, and a method of allocating a demodulation reference signal to the terminal by the base station according to the changed threshold by the allocation processing unit and transmitting a control signal including the changed threshold to the base station to determine .

According to the present invention, by changing the demodulation reference signal allocation method according to the channel environment, it is possible to increase the use efficiency of REs (Resource Elements) used for data channel (PDSCH/PUSCH) allocation and thereby improve the transmission speed.

1 is a diagram for explaining a mobile communication system according to an embodiment of the present invention.
2 is a diagram for explaining a method for allocating a reference signal according to an embodiment of the present invention.
3 is a diagram for explaining the configuration of an apparatus for allocating a reference signal in a wireless communication system according to an embodiment of the present invention.
4 is a flowchart illustrating an initial transmission resource allocation method for data transmission of a control server in a wireless communication system according to an embodiment of the present invention.
5 is a flowchart illustrating a transmission resource allocation method for data transmission of a control server in a wireless communication system according to an embodiment of the present invention.

Hereinafter, a preferred embodiment in which a person skilled in the art can easily practice the present invention will be described in detail with reference to the accompanying drawings. However, in the detailed description of the operating principle of the preferred embodiment of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. This is to more clearly convey the core of the present invention without obscuring it by omitting unnecessary description. In addition, since the present invention can make various changes and have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description, but this is not intended to limit the present invention to specific embodiments, It should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Additionally, when an element is referred to as being “connected” or “connected” to another element, it means that it is logically or physically connected or capable of being connected. In other words, it should be understood that a component may be directly connected or connected to another component, but another component may exist in the middle, or may be indirectly connected or connected.

In addition, terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In addition, terms such as "include" or "having" described in this specification are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or the other It should be understood that the above does not preclude the possibility of the presence or addition of other features, numbers, steps, operations, components, parts, or combinations thereof.

Now, an apparatus supporting dynamic power back off according to an embodiment of the present invention will be described in detail with reference to the drawings. At this time, the same reference numerals are used for parts having similar functions and actions throughout the drawings, and overlapping descriptions thereof will be omitted. In addition, in order to avoid obscuring the concept of the present invention, well-known structures and devices may be omitted or may be shown in block diagram form centering on core functions of each structure and device.

First, a network environment to which an embodiment of the present invention is applied will be described. 1 is a diagram for explaining a mobile communication system according to an embodiment of the present invention. 2 is a diagram for explaining a method for allocating a reference signal according to an embodiment of the present invention. Referring to FIG. 1, a communication system according to an embodiment of the present invention includes a control server 10, a base station 20 and a terminal 30.

The base station 20 is a device that provides a radio access service to the terminal 30 in a radio section. Base station 20 is 3GPP Rel. A gNB, which is a radio access network device that provides a radio access service to the terminal 30 according to 5G technology based on 5G New Radio (NR) of 15, may be exemplified. However, the base station 20 of the present invention is not limited to the gNB, and can be applied to all radio access network devices that provide radio access services to the terminal 30.

When allocating transmission resources for the terminal 30, the control server 10 may determine a demodulation reference signal (DMRS) allocation method. As shown in FIG. 2, according to the 3GPP specification, a data channel that is a channel through which actual data is transmitted, that is, a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH) There are a first type (DMRS Type1) and a second type (DMRS Type2) as a DMRS allocation method (DMRS Configuration Type) for a shared channel.

In the case of the first type (DMRS Type 1), when using Layers 1 to 2 (1000, 1001), the usable resource element (RE) is 50%, and when using Layers 3 to 4 (1000, 1001, 1002, 1003) , the usable RE is 0%. On the other hand, in the case of the second type (DMRS Type2), when layers 1 to 2 (1000, 1001) are used, the available RE is 66.6%, and when layers 3 to 4 (1000, 1001, 1002, 1003) are used, the available RE is It is 33.3%. REs not allocated to DMRS, that is, usable REs may be allocated to PDSCH or PUSCH. That is, in the case of the second type (DMRS Type2) than the first type (DMRS Type1), since the ratio of usable REs is higher, more PDSCHs or PUSCHs can be allocated. In particular, when using layers 3 to 4 (1000, 1001, 1002, 1003), there is no remaining RE, so it cannot be allocated to PDSCH or PUSCH at all. Therefore, if the second type (DMRS Type2) is used instead of the first type (DMRS Type1), a speed improvement effect can be expected by increasing RE use efficiency.

Since there is no difficulty in estimating the channel in the strong electric field region, the control server 10 applies the second format (DMRS Type2) when the terminal 30 is located in the strong electric field region, and when using layers 1 to 2, the data channel (PDSCH, 66.7% of RE is allocated to PUSCH) to maximize the speed improvement effect, and 33.4% of RE is allocated to PDSCH even in layers 3 and 4 to obtain a speed improvement effect. On the other hand, when the terminal 30 is located in an area other than the strong electric field area, that is, the non-strong electric field area, the control server 10 applies the first format (DMRS Type 1) to use the data channel (PDSCH) when layers 1 to 2 are used. , PUSCH) by allocating 50% of RE to improve speed and at the same time enable more accurate DMRS channel estimation. However, in the first format (DMRS Type 1), there is no speed improvement effect because there is no remaining RE to be allocated to the data channels (PDSCH, PUSCH) when Layers 3 to 4 are used.

In order to distinguish whether the terminal 30 is located in a strong electric field area or a non-strong electric field area, the control server 10 uses information capable of estimating a channel state. Such information may be signal quality information and data transmission rate measured by the terminal 30 . Signal quality information includes Modulation and Coding Scheme (MCS), Signal to Interference Noise Ratio (SINR), and Reference Signal Received Power (RSRP).

The control server 10 sets a threshold for distinguishing whether the signal quality information and the data transmission rate are located in a strong electric field area or a non-strong electric field area. In addition, the control server 10 sets the DMRS configuration type for the terminal 30 to the second type (DMRS Type2) when the terminal 30 is determined to be located in the strong electric field region or higher. On the other hand, the control server 10 sets the DMRS configuration type for the terminal 30 to the first type (DMRS Type 1) below the threshold for determining that the terminal 30 is located in the nasal field area, A control signal including a threshold value is transmitted to the base station 20 so as to allocate resources not used for demodulation reference signal allocation to the data channel.

Next, the configuration of an apparatus for allocating a reference signal in a wireless communication system according to an embodiment of the present invention will be described. 3 is a diagram for explaining the configuration of an apparatus for allocating a reference signal in a wireless communication system according to an embodiment of the present invention. Referring to FIG. 3 , the control server 10 includes a communication unit 110 , a storage unit 120 and a control unit 130 .

The communication unit 110 is for communicating with the base station 20 . The communication unit 110 may include a modem that modulates a transmitted signal and demodulates a received signal. The communication unit 110 may receive signal quality information and data transmission rate of the terminal 30 measured by the terminal 30 from the base station 20 . In addition, the communication unit 110 may transmit a DMRS configuration type for the terminal 30 to the base station 20 under the control of the control unit 130 .

The storage unit 120 serves to store data necessary for the operation of the base station 20 . In particular, the storage unit 120 may store information for threshold classification according to an embodiment of the present invention. Meanwhile, various types of data stored in the storage unit 120 may be registered, deleted, changed, or added according to an administrator's manipulation.

The control unit 130 may control the overall operation of the base station 20 and signal flow between internal blocks of the base station 20, and may perform a data processing function of processing data. The controller 130 may be a central processing unit, a digital signal processor, or the like. The control unit 130 includes an information collection unit 131, a standard setting unit 133, and an allocation processing unit 135. Operations of the control unit 130 including the information collection unit 131, the standard setting unit 133, and the allocation processing unit 135 will be described in more detail below.

Next, an initial transmission resource allocation method for data transmission of the control server 10 in a wireless communication system according to an embodiment of the present invention will be described. 4 is a flowchart illustrating an initial transmission resource allocation method for data transmission of a control server in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 4, the information collection unit 131 of the control unit 130 of the control server 10 collects at least one piece of signal quality information and signal quality information from the base station 20 to the terminal 30 for a predetermined period in step S110. The data transmission rate of the terminal 30 corresponding to is received. Then, the criterion setting unit 133 divides the value of the signal quality information into predetermined units in step S120 to generate a plurality of cases. For example, a plurality of cases are shown in Table 1 below.

case MCS (level) SINR(dB) RSRP (dBm) A 20 20 -75 B 15 15 -85 C 10 10 -95 D 5 5 -105

For example, referring to Table 1, it is assumed that the signal quality information used is SINR. In this case, as illustrated in Table 1, the reference setting unit 133 may generate a plurality of cases A, B, C, and D by dividing the SINR value into a predetermined unit, that is, 5 dB. Subsequently, the standard setting unit 133 compares the data transmission rate of the terminal 30 corresponding to each of the plurality of cases in step S130, selects a case with the highest data transmission rate of the terminal 30 as a threshold case, and selects The value of the signal quality information of the threshold case is set as the threshold.

For example, the standard setting unit 133 may compare data transmission rates of the terminal 30 corresponding to cases A, B, C, and D, and select a case having the highest data transmission rate as a threshold case. More specifically, referring to Table 1, assuming that the DMRS Type change standard is RSRP, -75, -85, -95 and -105 dBm, as a result of comparing the data transmission rate in each DMRS Type change standard, -95dBm It is assumed that the data transfer rate at is the highest. Then, case C can be selected as the threshold case. And, in this case, the threshold becomes RSRP = -95dBm.

Then, the allocation processing unit 135 transmits a control signal including at least one threshold value of signal quality information to the base station 20 in step S140, so that the base station 20 transmits a control signal to the terminal 30 according to the threshold of the threshold case. Set the DMRS configuration type to the first type (Type2) or the second type (Type2). That is, after receiving the threshold, the base station 20 periodically collects signal quality information newly reported by the terminal 30 for a certain period of time, compares the current DMRS Type change criterion with the threshold, and if it is greater than or equal to the threshold, the terminal 30 ) is set to the second type (Type2), and if the reported signal quality information is less than the threshold, the DMRS allocation method for the terminal 30 is set to the first type (Type2).

As described above, when the channel state changes while the threshold is set, the threshold may be changed. These methods will be described. 5 is a flowchart illustrating a transmission resource allocation method for data transmission of a control server in a wireless communication system according to an embodiment of the present invention.

Referring to Table 1 and FIG. 5, the information collection unit 131 of the control unit 130 of the control server 10 collects at least one signal quality information and signal of the terminal 30 from the base station 20 at a predetermined period in step S210. The speed of the terminal 30 corresponding to the quality information is received.

Next, the standard setting unit 133 compares the speed of the terminal 30 corresponding to the threshold case and each case other than the threshold case for a predetermined time in step S220, and compares the speed of the terminal 30 corresponding to the threshold case for a predetermined time or longer. It is determined whether there is a case having a data transmission rate higher than the transmission rate. As a result of the determination in step S220, if there is a case having a data transmission rate higher than the data transmission rate of the terminal corresponding to the threshold case, the process proceeds to step S230, and the data transmission rate of the terminal higher than the data transmission rate of the terminal corresponding to the threshold case exists. If there is no case having a data transfer rate, the process proceeds to step S210 and steps S210 and S220 are repeated.

The criterion setting unit 133 changes the threshold case in step S230. That is, the standard setting unit 133 changes the case in which the terminal 30 has the highest speed to a threshold case, and changes the signal quality information value of the changed threshold case to the threshold. Then, the allocation processing unit 135 transmits a control signal including the changed threshold to the base station 20 in step S240, so that the base station 20 assigns a DMRS configuration type to the terminal 30 according to the changed threshold. ) is determined as the first type (Type2) or the second type (Type2).

Meanwhile, the method according to an embodiment of the present invention may be provided in the form of a computer readable medium suitable for storing computer program instructions and data. Such a computer-readable recording medium may include program commands, data files, data structures, etc. alone or in combination, and includes all types of recording devices storing data that can be read by a computer system. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical recording media such as CD-ROMs (Compact Disk Read Only Memory) and DVDs (Digital Video Disks). Optical media), magneto-optical media such as floptical disks, and program instructions such as ROM (Read Only Memory), RAM (RAM, Random Access Memory), flash memory, etc. and a hardware device specially configured to do so. In addition, the computer-readable recording medium is distributed in computer systems connected through a network, so that computer-readable codes can be stored and executed in a distributed manner. In addition, functional programs, codes, and code segments for implementing the present invention can be easily inferred by programmers in the technical field to which the present invention belongs.

Although the above has been described and illustrated in relation to preferred embodiments for illustrating the technical idea of the present invention, the present invention is not limited to the configuration and operation as shown and described in this way, without departing from the scope of the technical idea. It will be readily apparent to those skilled in the art that many changes and modifications can be made to the present invention. Accordingly, all such appropriate changes and modifications and equivalents should be regarded as falling within the scope of the present invention.

The present invention relates to an apparatus for allocating a reference signal in a wireless communication system and a method therefor. It is possible to increase the use efficiency of REs (Resource Elements) used for allocation and thereby improve the transmission speed. The present invention has industrial applicability because it is not only commercially available or commercially viable, but also realistically and clearly practicable.

10: base station 30: terminal
110: communication unit 120: storage unit
130: control unit 131: information collection unit
133: standard setting unit 135: allocation processing unit

Claims (6)

Information collection unit for collecting the signal quality information measured by the terminal from the base station and the data transmission rate of the terminal corresponding to the signal quality information;
a threshold setting unit configured to set a threshold for discriminating whether the terminal is in a strong electric field area or a non-strong electric field area according to the signal quality information and the speed; and
an assignment processing unit for transmitting a control signal including the threshold to the base station so that the base station determines a demodulation reference signal (DMRS) allocation method for the terminal according to the threshold;
characterized in that it includes
A device for assigning a reference signal. According to claim 1,
The threshold setting unit
Generating a plurality of cases by dividing the value of the signal quality information into predetermined units;
Comparing the data transmission rate of the terminal corresponding to each of a plurality of cases, selecting a case having the highest data transmission rate of the terminal as a threshold case, and setting the signal quality information value of the selected threshold case as a threshold. doing
A device for assigning a reference signal. According to claim 1,
The allocation processing unit
If the signal quality information is greater than or equal to the threshold, the demodulation reference signal allocation method for the terminal is set to the second type, and if the signal quality information is less than the threshold, the demodulation reference signal allocation method for the terminal is set to the first type. characterized in that a control signal including the threshold is transmitted to the base station so as to allocate resources not used for demodulation reference signal allocation to the data channel.
A device for assigning a reference signal. According to claim 1,
After transmitting the control signal including the threshold to the base station,
The information collection department
Collecting signal quality information measured by the terminal from the base station at a predetermined period and data transmission rate of the terminal corresponding to the signal quality information;
The standard setting unit
The data transmission rate of the terminal corresponding to each of the threshold case and other cases other than the threshold case for a predetermined time is compared, and the case having the data transmission rate of the terminal higher than the data transmission rate of the terminal corresponding to the threshold case for more than a predetermined period of time is determined. determine whether there is
As a result of the determination, if there is a case having a data transmission rate higher than the data transmission rate of the terminal corresponding to the threshold case, the case with the highest data transmission rate of the terminal is changed to the threshold case, and the signal of the changed threshold case is changed. Change the value of quality information to a threshold value,
The allocation processing unit
Characterized in that the base station transmits a control signal including the changed threshold to the base station so that the base station determines a demodulation reference signal allocation method for the terminal according to the changed threshold
A device for assigning a reference signal. Collecting, by the information collection unit, the signal quality information measured by the terminal from the base station and the data transmission rate of the terminal corresponding to the signal quality information;
setting a threshold for distinguishing whether the terminal is in a strong electric field area or a non-strong electric field area according to the signal quality information and the speed, by a threshold setting unit; and
transmitting, by an allocation processing unit, a control signal including the threshold to the base station so that the base station determines a demodulation reference signal (DMRS) allocation method for the terminal according to the threshold;
characterized in that it includes
A method for allocating a reference signal. Collecting the signal quality information measured by the terminal and the data transmission rate of the terminal corresponding to the signal quality information;
setting a threshold for discriminating whether the terminal is in a strong electric field region or a non-strong electric field region according to the signal quality information and the speed;
determining a demodulation reference signal (DMRS) allocation method for the terminal according to the threshold; and
A reference signal allocation method in a base station comprising the step of allocating resources not used for demodulation reference signal allocation to data channels in the determined demodulation reference signal allocation scheme.

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