KR102145487B1 - Mobile communication system and method thereof - Google Patents

Abstract

The present invention relates to a mobile communication system and a control method thereof. The control method of a mobile communication system according to the present invention includes the steps of comparing a channel usage rate for data transmission with at least one preset value; Setting an offset value corresponding to a portion of the power available in the channel for data transmission when the use rate of the channel for data transmission is less than a preset value as a result of the comparison in the step; Calculating a final transmission power obtained by adding the offset value set in the step to the basic transmission power preset for the synchronization signal block; And transmitting the synchronization signal block using the final transmission power calculated in the step.

Description

Mobile communication system and its control method {MOBILE COMMUNICATION SYSTEM AND METHOD THEREOF}

The present invention relates to a mobile communication system and a control method thereof, and more particularly, using a PDSCH (Physical Downlink Shared Channel) for data transmission, and using a Synchronization Signal Block (SSB) using transmission of synchronization signals and system information. It relates to a mobile communication system and a control method thereof.

The 3GPP (The 3rd Generation Partnership Project) is an organization that develops, improves, and maintains mobile communication standards on behalf of standard organizations around the world such as North America, Europe, China, Korea, Japan, and India. It is officially announced through Standards Development Organizations (SDO) located in

The 3GPP continues to develop standards in the past, such as 3G and 4G, and has recently established and published standards related to mobile communication such as 5G.

Existing 3G and 4G systems related to mobile communication are insufficient to properly support services related to reliability, rapidity, and mass communication, such as IoT and autonomous vehicles, so 5G systems were introduced.

The characteristics of the 5G system are that it is possible to introduce ultra-wideband service, high-reliability/ultra-low-latency communication, and mass connectivity, so each country is considering introduction and is actually promoting it.

However, such a 5G system, that is, 5G New Radio (NR), uses a beam forming technology to increase communication coverage and reduce interference.

Beamforming technology utilizes dozens or more of antennas to overcome the physical characteristics of ultra-high frequencies, and focuses energy in a specific direction by precisely controlling signals loaded on a large number of antennas, or conversely, in a specific direction. It is a technology that can be adjusted so that no energy is emitted, and it can increase the distance by concentrating the energy of radio waves and minimize interference between beams.

However, in 5G, beamforming for data transmission and beamforming for transmission of synchronization signals or system information use different forms, so unlike 4G, data coverage and coverage for transmission of synchronization signals or system information do not match. Cases can arise.

In particular, when transmitting synchronization signals or system information, SSB ((Synchronization Signal Block)) is used.Since the maximum number of available beams for SSB is determined in the standard, beams with a wide beam width are used to cover a wider area horizontally. When used, the beamforming gain decreases, resulting in a problem that SSB coverage decreases.

Accordingly, there is a need for a method of increasing SSB power in order to improve SSB coverage of a terminal in a weak signal area at a cell edge.

Publication Patent No. 10-2018-0112918

The present invention has been devised to meet the above-described conventional request, and an object thereof is to provide a mobile communication system and a control method thereof for dynamically increasing SSB power according to a situation.

In order to achieve the above object, a control method of a mobile communication system according to the present invention includes the steps of comparing a channel usage rate for data transmission with at least one preset value; Setting an offset value corresponding to a portion of the power available in the channel for data transmission when the use rate of the channel for data transmission is less than a preset value as a result of the comparison in the step; Calculating a final transmission power obtained by adding the offset value set in the step to the basic transmission power preset for the synchronization signal block; And transmitting the synchronization signal block with the final transmission power calculated in the step.

In addition, in order to achieve the above object, a mobile communication system according to the present invention includes: a comparison unit for comparing a channel usage rate for data transmission with at least one preset value; An offset setting unit configured to set an offset value corresponding to a portion of the power available in the channel for data transmission when the use rate of the channel for data transmission is less than a preset value as a result of the comparison of the comparison unit; A calculator configured to calculate a final transmission power obtained by adding an offset value set by the offset setting unit to a basic transmission power preset for the synchronization signal block; And a signal transmission unit for transmitting the synchronization signal block with the final transmission power calculated by the calculation unit.

As described above, according to the present invention, when the PDSCH usage rate is low in a 5G mobile communication system, some of the power to be used in the PDSCH can be used for SSB transmission, and thus efficiency in overall power operation can be maximized. In this case, by determining the data usage based on the PRB of the PDSCH, there is an advantage that it is not necessary to separately detect data communication power.

Particularly, by determining the PDSCH usage rate based on the second-stage set value, the amount of power to be dedicated to the SSB can be precisely controlled, and further, when the power of the SSB is increased, the PDSCH usage rate of the adjacent cell is considered. Due to the increase, it is possible to prevent interference in data communication of adjacent cells in advance.

1 is a schematic configuration diagram of an entire system including a mobile communication system according to an embodiment of the present invention,
2 is a functional block diagram of the mobile communication system of FIG. 1;
3 and 4 are a control flowchart of a mobile communication system according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, each embodiment according to the present invention is merely an example for aiding understanding of the present invention, and the present invention is not limited to this embodiment. In particular, the present invention may be configured with a combination of at least one or more of individual configurations, individual functions, or individual steps included in each embodiment.

In particular, for convenience, some claims in the claims include alphabets such as'(a)', but these alphabets do not prescribe the order of each step.

In addition, each signal mentioned in each embodiment according to the present invention may mean one signal transmitted by one connection or the like, but may also mean a series of signal groups transmitted for the purpose of performing a specific function to be described later. . That is, in each embodiment, a plurality of signals transmitted at a predetermined time interval or transmitted after receiving a response signal from a counterpart device may be expressed as one signal name for convenience.

A schematic configuration of the entire system including the mobile communication system 100 according to an embodiment of the present invention is as shown in FIG. 1.

In this embodiment, the mobile communication system 100 may include a base station and a server, and the base station transmits radio waves according to the beamforming technology as described above to perform communication with each terminal 200.

The schematic configuration of the mobile communication system 100 is as shown in FIG. 2, and hereinafter, each component of FIG. 2 will be described, at least some of the components of FIG. 2 are included in the base station or server of FIG. Can be included.

As shown in FIG. 2, the mobile communication system 100 according to the present embodiment includes a comparison unit 110, an offset setting unit 120, a calculation unit 130, a signal transmission unit 140, and a determination unit 150. , It may be configured to include a storage unit 160.

First, the storage unit 160 may contain data, information, or applications necessary for the operation of the mobile communication system 100 according to the present embodiment, and may also be newly generated or externally generated during the operation of the mobile communication system 100. It can store received data or information.

In particular, the storage unit 160 may store various set values or offset values described below.

The comparison unit 110 performs a function of comparing the utilization rate of a physical downlink shared channel (PDSCH) for data transmission in 5G with at least one preset value.For example, the comparison unit 110 is a physical resource (PRB) of the PDSCH. Block) You can check the overall data usage by comparing the usage rate with a preset value. Here, the PDSCH refers to a channel for data transmission in 5G, and since the PDSCH and PRB correspond to known techniques, a more detailed description will be omitted.

The comparison unit 110 may compare the PDSCH usage rate with a single value, or may compare it with a plurality of set values according to a predetermined condition, which will be described in more detail later.

The determination unit 150 performs a function of determining whether the PDSCH usage rate in the adjacent cell is less than or equal to a preset value. In determining the PDSCH utilization rate in the adjacent cell, the determination unit 150 directly checks and determines the PDSCH utilization rate of the adjacent cell through the comparison unit 110, or the PDSCH utilization rate by the corresponding base station from the adjacent base station is less than a preset value. It can be determined by receiving information that enables recognition of recognition.

The offset setting unit 120 performs a function of setting an offset value corresponding to a part of the power available in the PDSCH when the PDSCH usage rate is less than a preset value as a result of the comparison by the comparison unit 110.

For example, the offset setting unit 120 may set a preset first offset value when the PDSCH usage rate as a result of comparison by the comparison unit 110 is less than or equal to the first set value. For example, the first set value is '20%' , When the corresponding first offset value is 6dB, the comparison unit 110 may compare the PDSCH usage rate and 20%, and the offset setting unit 120, as a result, when the PDSCH usage rate is less than 20%, the first offset value of 6dB Can be set as an additional power value. This additional power value set in the offset setting unit 120 is added to the power used for the SSB by the new output unit and the signal transmission unit 140, which will be described in more detail later.

As another example, when the second set value is '40%' and the corresponding second offset value is 3dB, the offset setting unit 120 compares the comparison result of the comparison unit 110 with the PDSCH usage rate being the first set value. If it is greater than 20% but less than the second set value of 40%, the second offset, 3dB, is set as an additional power value.

Here, in setting the offset value, the offset setting unit 120 may consider the PDSCH utilization rate in the adjacent cell, that is, the above-described only when the PDSCH utilization rate in the adjacent cell by the determination unit 150 is less than a preset value. The first offset value or the second offset value may be set.

The calculation unit 130 applies an offset value set by the setting unit (ie, an additional power value previously set) to a preset basic transmission power for a synchronization signal block (SSB) used when transmitting synchronization signals and system information in 5G. It performs a function of calculating the added final transmission power.

For example, when the first offset value or the second offset value is set by the offset setting unit 120, the calculation unit 130 may calculate the final transmission power obtained by adding the set value to the preset basic transmission power.

Specifically, when the offset setting unit 120 sets the first offset value or the second offset value, the calculation unit 130 calculates the final transmission power by using the corresponding first or second offset value and the basic transmission power. In case the first offset value and the second offset value are not set because the offset setting unit 120 does not meet a preset condition, the basic transmission power is calculated as the final transmission power.

For example, the calculation unit 130 calculates 36 dB as the final transmission power when 6 dB (first offset value) is set as the additional power value in the offset setting unit 120 in a state where the basic transmission power is 30 dB, and sets the offset. When 3dB (second offset value) is set as the additional power value by the unit 120, 33dB is calculated as the final transmission power, and when neither the first offset value or the second offset value is set by the offset setting unit 120 Is to calculate the original 30dB as the final transmission power.

The signal transmission unit 140 performs a function of transmitting the SSB using the final transmission power calculated by the calculation unit 130.

Accordingly, the power of the SSB transmitted from the mobile communication system 100 may be dynamically changed according to the utilization rate of the PDSCH. That is, by using a part of the power not used in the PDSCH for SSB transmission power, communication with a terminal in a weak signal area such as a cell edge area can be smoothly performed.

In particular, it is possible to minimize inter-cell interference due to an increase in SSB power by considering the PDSCH utilization rate of adjacent cells.

Hereinafter, a detailed control process of the mobile communication system 100 according to an embodiment of the present invention will be described with reference to FIG. 3.

The mobile communication system 100 compares the PDSCH PRB usage rate with a preset first setting value. When the PDSCH PRB usage rate is less than 20% as a result of the comparison (step S1), the PDSCH PRB usage rate of the adjacent cell is checked (step S3).

As a result of the confirmation, if the PDSCH PRB utilization rate of the adjacent cell is less than a preset value (for example, 20%) (step S3), the mobile communication system 100 applies 6dB corresponding to the first offset value to the basic transmission power (for example, 30dB). The sum of the SSB power values is calculated (step S5), and a transmission procedure for transmitting the SSB with power corresponding to the calculated SSB power value (ie, 36 dB) is performed (step S7).

On the other hand, when the PDSCH PRB usage rate is not less than 20% as a result of comparing the PDSCH PRB usage rate with the preset first setting value (step S1), the mobile communication system 100 additionally has the PDSCH PRB usage rate less than the second setting value 40%. It is checked if it is small (step S9).

As a result of the verification, if the PDSCH PRB usage rate is less than 40% (step S9), the mobile communication system 100 similarly checks the PDSCH PRB usage rate of the adjacent cell, and as a result of the verification, the PDSCH PRB usage rate of the adjacent cell is set to a preset value (for example, 20%). ) Less than (step S11), the mobile communication system 100 calculates an SSB power value of a magnitude obtained by adding 3dB corresponding to the second offset value to the basic transmission power (for example, 30dB) (step S13), A transmission procedure for transmitting an SSB with power (ie, 33 dB) corresponding to the SSB power value is performed (step S7).

Meanwhile, in the mobile communication system 100, when the PDSCH PRB usage rate is not less than 40% (step S9), or the PDSCH PRB usage rate of the adjacent cell is not less than a preset value (for example, 20%) (step S3, In S11), a transmission procedure for transmitting an SSB with basic transmission power (ie, 30 dB) is performed (step S7).

In the above-described process, the process of comparing the PRB of the PDSCH with a preset value may be performed in a different order.

That is, the PRB of the PDSCH may not be compared with 20% first, but compared with 40% before processing.

This process is illustrated in FIG. 4.

First, the mobile communication system 100 determines whether the utilization rate of the PDSCH PRB is less than 40% (step S21), and if the determination result is that the utilization rate of the PDSCH PRB is not less than 40% (step S21), the basic transmission power (one For example, the SSB is transmitted at 30dB) (step S29).

If, as a result of the determination, the PDSCH PRB usage rate is less than 40% (step S21), the mobile communication system 100 compares the PDSCH PRB usage rate with 20% (step S23), and as a result of the comparison, the PDSCH PRB usage rate is less than 20%. If it is small (step S23), under the premise that the utilization rate of the PDSCH PRB of the adjacent cell is less than a preset value (for example, 20%) (step S25), the SSB power value of the size of adding 6dB to the basic transmission power (for example, 30dB) Is calculated (step S27), and a transmission procedure for transmitting the SSB at the power corresponding to the thus calculated SSB power value (ie, 36 dB) is performed (step S29).

As another example, if the comparison result is that the PDSCH PRB usage rate is not less than 20% (step S23), the default transmission is based on the assumption that the PDSCH PRB usage rate of the adjacent cell is less than a preset value (for example, 20%) (step S31). An SSB power value of a magnitude of adding 3 dB to the power (for example, 30 dB) is calculated (step S33), and a transmission procedure is performed so that the SSB is transmitted with the power (ie, 33 dB) corresponding to the calculated SSB power value ( Step S29).

Meanwhile, it goes without saying that the process of performing each of the above-described embodiments may be performed by a program or application stored in a predetermined recording medium (eg, computer-readable). Here, the recording medium includes all of an electronic recording medium such as a random access memory (RAM), a magnetic recording medium such as a hard disk, and an optical recording medium such as a compact disk (CD).

In this case, the program stored in the recording medium may be executed on hardware such as a computer or a smart phone to perform each of the above-described embodiments. In particular, at least one of the functional blocks of the mobile communication system according to the present invention described above may be implemented by such a program or application.

In addition, the present invention is not limited to the specific embodiments described above, but can be implemented by various modifications and modifications without departing from the gist of the present invention. It will be apparent that such modifications and modifications are included in the present invention if they fall within the appended claims.

100: mobile communication system 200: user terminal
110: comparison unit 120: offset setting unit
130: calculation unit 140: signal transmission unit
150: judgment unit 160: storage unit

Claims (12)

In the control method of the mobile communication system,
(a) comparing a channel usage rate for data transmission with at least one preset value;
(b) setting an offset value corresponding to a portion of the power available in the channel for data transmission when the use rate of the channel for data transmission is less than or equal to a preset value as a result of the comparison in step (a);
(c) calculating a final transmission power obtained by adding the offset value set in step (b) to the basic transmission power preset for the synchronization signal block;
(d) transmitting the synchronization signal block using the final transmission power calculated in step (c). The method of claim 1,
The control method of a mobile communication system, characterized in that the channel for data transmission in step (a) is a Physical Downlink Shared Channel (PDSCH) for data transmission in 5G (5 Generation). The method of claim 2,
In step (b), when the comparison result of step (a) is less than a preset value, an offset value corresponding to a portion of power available in the PDSCH is set. Way. The method of claim 1,
The synchronization signal block in step (c) is a synchronization signal block (SSB) used for transmission of synchronization signals and system information in 5G (5 Generation). The method of claim 4,
In the step (d), the SSB is transmitted using the final transmission power calculated in the step (c). A computer-readable recording medium storing a program for executing the method of any one of claims 1 to 5. An application program stored in a computer-readable recording medium to execute the method of any one of claims 1 to 5 in combination with hardware. In a mobile communication system,
A comparison unit for comparing a channel usage rate for data transmission with at least one preset value;
An offset setting unit configured to set an offset value corresponding to a portion of the power available in the channel for data transmission when the use rate of the channel for data transmission is less than a preset value as a result of the comparison of the comparison unit;
A calculator configured to calculate a final transmission power obtained by adding an offset value set by the offset setting unit to a basic transmission power preset for the synchronization signal block;
And a signal transmission unit for transmitting the synchronization signal block with the final transmission power calculated by the calculation unit. The method of claim 8,
And the comparison unit compares a utilization rate of a physical downlink shared channel (PDSCH) for data transmission in 5G (5 generation) with at least one preset value. The method of claim 9,
And the offset setting unit sets an offset value corresponding to a part of the power available in the PDSCH when the use rate of the PDSCH is less than a preset value as a result of the comparison by the comparison unit. The method of claim 8,
The synchronization signal block is a synchronization signal block (SSB) used for transmission of synchronization signals and system information in 5G (5 Generation). The method of claim 11,
The mobile communication system, wherein the signal transmission unit transmits the SSB using the final transmission power calculated by the calculation unit.

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